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SPIRV-Cross/spirv_glsl.cpp
Bill Hollings 103aabf5e8 Initial support for Metal Shading Language.
2016-04-06 17:42:27 -04:00

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/*
* Copyright 2015-2016 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "spirv_glsl.hpp"
#include "GLSL.std.450.h"
#include <algorithm>
#include <assert.h>
using namespace spv;
using namespace spirv_cross;
using namespace std;
static const char* to_pls_layout(PlsFormat format)
{
switch (format)
{
case PlsR11FG11FB10F: return "layout(r11f_g11f_b10f) ";
case PlsR32F: return "layout(r32f) ";
case PlsRG16F: return "layout(rg16f) ";
case PlsRGB10A2: return "layout(rgb10_a2) ";
case PlsRGBA8: return "layout(rgba8) ";
case PlsRG16: return "layout(rg16) ";
case PlsRGBA8I: return "layout(rgba8i)" ;
case PlsRG16I: return "layout(rg16i) ";
case PlsRGB10A2UI: return "layout(rgb10_a2ui) ";
case PlsRGBA8UI: return "layout(rgba8ui) ";
case PlsRG16UI: return "layout(rg16ui) ";
case PlsR32UI: return "layout(r32ui) ";
default: return "";
}
}
static SPIRType::BaseType pls_format_to_basetype(PlsFormat format)
{
switch (format)
{
default:
case PlsR11FG11FB10F:
case PlsR32F:
case PlsRG16F:
case PlsRGB10A2:
case PlsRGBA8:
case PlsRG16:
return SPIRType::Float;
case PlsRGBA8I:
case PlsRG16I:
return SPIRType::Int;
case PlsRGB10A2UI:
case PlsRGBA8UI:
case PlsRG16UI:
case PlsR32UI:
return SPIRType::UInt;
}
}
static uint32_t pls_format_to_components(PlsFormat format)
{
switch (format)
{
default:
case PlsR32F:
case PlsR32UI:
return 1;
case PlsRG16F:
case PlsRG16:
case PlsRG16UI:
case PlsRG16I:
return 2;
case PlsR11FG11FB10F:
return 3;
case PlsRGB10A2:
case PlsRGBA8:
case PlsRGBA8I:
case PlsRGB10A2UI:
case PlsRGBA8UI:
return 4;
}
}
void CompilerGLSL::reset()
{
// We do some speculative optimizations which should pretty much always work out,
// but just in case the SPIR-V is rather weird, recompile until it's happy.
// This typically only means one extra pass.
force_recompile = false;
// Clear invalid expression tracking.
invalid_expressions.clear();
function = nullptr;
// Clear temporary usage tracking.
expression_usage_counts.clear();
forwarded_temporaries.clear();
// Clear identifier caches
global_struct_cache.clear();
for (auto &id : ids)
{
// Clear unflushed dependees.
if (id.get_type() == TypeVariable)
id.get<SPIRVariable>().dependees.clear();
// And remove all expressions.
else if (id.get_type() == TypeExpression)
id.reset();
// Reset active state for all functions.
else if (id.get_type() == TypeFunction)
{
id.get<SPIRFunction>().active = false;
id.get<SPIRFunction>().flush_undeclared = true;
}
}
statement_count = 0;
indent = 0;
}
void CompilerGLSL::remap_pls_variables()
{
for (auto &input : pls_inputs)
{
auto &var = get<SPIRVariable>(input.id);
bool input_is_target = false;
if (var.storage == StorageClassUniformConstant)
{
auto &type = get<SPIRType>(var.basetype);
input_is_target = type.image.dim == DimSubpassData;
}
if (var.storage != StorageClassInput && !input_is_target)
throw CompilerError("Can only use in and target variables for PLS inputs.");
var.remapped_variable = true;
}
for (auto &output : pls_outputs)
{
auto &var = get<SPIRVariable>(output.id);
if (var.storage != StorageClassOutput)
throw CompilerError("Can only use out variables for PLS outputs.");
var.remapped_variable = true;
}
}
string CompilerGLSL::compile()
{
uint32_t pass_count = 0;
do
{
if (pass_count >= 3)
throw CompilerError("Over 3 compilation loops detected. Must be a bug!");
reset();
// Move constructor for this type is broken on GCC 4.9 ...
buffer = unique_ptr<ostringstream>(new ostringstream());
emit_header();
emit_resources();
emit_function(get<SPIRFunction>(execution.entry_point), 0);
pass_count++;
} while (force_recompile);
return buffer->str();
}
void CompilerGLSL::emit_header()
{
statement("#version ", options.version, options.es && options.version > 100 ? " es" : "");
// Needed for binding = # on UBOs, etc.
if (!options.es && options.version < 420)
{
statement("#ifdef GL_ARB_shading_language_420pack");
statement("#extension GL_ARB_shading_language_420pack : require");
statement("#endif");
}
for (auto &ext : forced_extensions)
statement("#extension ", ext, " : require");
if (!pls_inputs.empty() || !pls_outputs.empty())
statement("#extension GL_EXT_shader_pixel_local_storage : require");
vector<string> inputs;
vector<string> outputs;
switch (execution.model)
{
case ExecutionModelGeometry:
if (options.es && options.version < 320)
statement("#extension GL_EXT_geometry_shader : require");
if (!options.es && options.version < 320)
statement("#extension GL_ARB_geometry_shader4 : require");
outputs.push_back(join("max_vertices = ", execution.output_vertices));
if (execution.flags & (1ull << ExecutionModeInvocations))
inputs.push_back(join("invocations = ", execution.invocations));
if (execution.flags & (1ull << ExecutionModeInputPoints))
inputs.push_back("points");
if (execution.flags & (1ull << ExecutionModeInputLines))
inputs.push_back("lines");
if (execution.flags & (1ull << ExecutionModeInputLinesAdjacency))
inputs.push_back("lines_adjacency");
if (execution.flags & (1ull << ExecutionModeTriangles))
inputs.push_back("triangles");
if (execution.flags & (1ull << ExecutionModeInputTrianglesAdjacency))
inputs.push_back("triangles_adjacency");
if (execution.flags & (1ull << ExecutionModeOutputTriangleStrip))
outputs.push_back("triangle_strip");
if (execution.flags & (1ull << ExecutionModeOutputPoints))
outputs.push_back("points");
if (execution.flags & (1ull << ExecutionModeOutputLineStrip))
outputs.push_back("line_strip");
break;
case ExecutionModelTessellationControl:
if (options.es && options.version < 320)
statement("#extension GL_EXT_tessellation_shader : require");
if (!options.es && options.version < 400)
statement("#extension GL_ARB_tessellation_shader : require");
if (execution.flags & (1ull << ExecutionModeOutputVertices))
outputs.push_back(join("vertices = ", execution.output_vertices));
break;
case ExecutionModelTessellationEvaluation:
if (options.es && options.version < 320)
statement("#extension GL_EXT_tessellation_shader : require");
if (!options.es && options.version < 400)
statement("#extension GL_ARB_tessellation_shader : require");
if (execution.flags & (1ull << ExecutionModeQuads))
inputs.push_back("quads");
if (execution.flags & (1ull << ExecutionModeIsolines))
inputs.push_back("isolines");
if (execution.flags & (1ull << ExecutionModePointMode))
inputs.push_back("point_mode");
if (execution.flags & (1ull << ExecutionModeVertexOrderCw))
inputs.push_back("cw");
if (execution.flags & (1ull << ExecutionModeVertexOrderCcw))
inputs.push_back("ccw");
if (execution.flags & (1ull << ExecutionModeSpacingFractionalEven))
inputs.push_back("fractional_even_spacing");
if (execution.flags & (1ull << ExecutionModeSpacingFractionalOdd))
inputs.push_back("fractional_odd_spacing");
if (execution.flags & (1ull << ExecutionModeSpacingEqual))
inputs.push_back("equal_spacing");
break;
case ExecutionModelGLCompute:
if (!options.es && options.version < 430)
statement("#extension GL_ARB_compute_shader : require");
if (options.es && options.version < 310)
throw CompilerError("At least ESSL 3.10 required for compute shaders.");
inputs.push_back(join("local_size_x = ", execution.workgroup_size.x));
inputs.push_back(join("local_size_y = ", execution.workgroup_size.y));
inputs.push_back(join("local_size_z = ", execution.workgroup_size.z));
break;
case ExecutionModelFragment:
if (options.es)
{
switch (options.fragment.default_float_precision)
{
case Options::Lowp:
statement("precision lowp float;");
break;
case Options::Mediump:
statement("precision mediump float;");
break;
case Options::Highp:
statement("precision highp float;");
break;
default:
break;
}
switch (options.fragment.default_int_precision)
{
case Options::Lowp:
statement("precision lowp int;");
break;
case Options::Mediump:
statement("precision mediump int;");
break;
case Options::Highp:
statement("precision highp int;");
break;
default:
break;
}
}
if (execution.flags & (1ull << ExecutionModeEarlyFragmentTests))
inputs.push_back("early_fragment_tests");
if (execution.flags & (1ull << ExecutionModeDepthGreater))
inputs.push_back("depth_greater");
if (execution.flags & (1ull << ExecutionModeDepthLess))
inputs.push_back("depth_less");
break;
default:
break;
}
if (!inputs.empty())
statement("layout(", merge(inputs), ") in;");
if (!outputs.empty())
statement("layout(", merge(outputs), ") out;");
statement("");
}
void CompilerGLSL::emit_struct(const SPIRType &type)
{
auto name = type_to_glsl(type);
// Struct types can be stamped out multiple times
// with just different offsets, matrix layouts, etc ...
// Type-punning with these types is legal, which complicates things
// when we are storing struct and array types in an SSBO for example.
// For now, detect this duplication via OpName, but ideally we should
// find proper aliases by inspecting the actual type.
if (global_struct_cache.find(name) != end(global_struct_cache))
return;
update_name_cache(global_struct_cache, name);
statement("struct ", name);
begin_scope();
uint32_t i = 0;
bool emitted = false;
for (auto &member : type.member_types)
{
auto &membertype = get<SPIRType>(member);
statement(member_decl(type, membertype, i), ";");
i++;
emitted = true;
}
end_scope_decl();
if (emitted)
statement("");
}
uint64_t CompilerGLSL::combined_decoration_for_member(const SPIRType &type, uint32_t index)
{
uint64_t flags = 0;
auto &memb = meta[type.self].members;
if (index >= memb.size())
return 0;
auto &dec = memb[index];
// If our type is a sturct, traverse all the members as well recursively.
flags |= dec.decoration_flags;
for (uint32_t i = 0; i < type.member_types.size(); i++)
flags |= combined_decoration_for_member(get<SPIRType>(type.member_types[i]), i);
return flags;
}
string CompilerGLSL::layout_for_member(const SPIRType &type, uint32_t index)
{
bool is_block = (meta[type.self].decoration.decoration_flags &
((1ull << DecorationBlock) | (1ull << DecorationBufferBlock))) != 0;
if (!is_block)
return "";
auto &memb = meta[type.self].members;
if (index >= memb.size())
return 0;
auto &dec = memb[index];
vector<string> attr;
// We can only apply layouts on members in block interfaces.
// This is a bit problematic because in SPIR-V decorations are applied on the struct types directly.
// This is not supported on GLSL, so we have to make the assumption that if a struct within our buffer block struct
// has a decoration, it was originally caused by a top-level layout() qualifier in GLSL.
//
// We would like to go from (SPIR-V style):
//
// struct Foo { layout(row_major) mat4 matrix; };
// buffer UBO { Foo foo; };
//
// to
//
// struct Foo { mat4 matrix; }; // GLSL doesn't support any layout shenanigans in raw struct declarations.
// buffer UBO { layout(row_major) Foo foo; }; // Apply the layout on top-level.
auto flags = combined_decoration_for_member(type, index);
if (flags & (1ull << DecorationRowMajor))
attr.push_back("row_major");
// We don't emit any global layouts, so column_major is default.
//if (flags & (1ull << DecorationColMajor))
// attr.push_back("column_major");
if (dec.decoration_flags & (1ull << DecorationLocation))
attr.push_back(join("location = ", dec.location));
if (attr.empty())
return "";
string res = "layout(";
res += merge(attr);
res += ") ";
return res;
}
const char* CompilerGLSL::format_to_glsl(spv::ImageFormat format)
{
// Only handle GLES 3.1 compliant types for now ...
switch (format)
{
case ImageFormatRgba32f: return "rgba32f";
case ImageFormatRgba16f: return "rgba16f";
case ImageFormatR32f: return "r32f";
case ImageFormatRgba8: return "rgba8";
case ImageFormatRgba8Snorm: return "rgba8_snorm";
case ImageFormatRg32f: return "rg32f";
case ImageFormatRg16f: return "rg16f";
case ImageFormatRgba32i: return "rgba32i";
case ImageFormatRgba16i: return "rgba16i";
case ImageFormatR32i: return "r32i";
case ImageFormatRgba8i: return "rgba8i";
case ImageFormatRg32i: return "rg32i";
case ImageFormatRg16i: return "rg16i";
case ImageFormatRgba32ui: return "rgba32ui";
case ImageFormatRgba16ui: return "rgba16ui";
case ImageFormatR32ui: return "r32ui";
case ImageFormatRgba8ui: return "rgba8ui";
case ImageFormatRg32ui: return "rg32ui";
case ImageFormatRg16ui: return "rg16ui";
case ImageFormatUnknown: return nullptr;
default: return "UNSUPPORTED"; // TODO: Fill in rest.
}
}
uint32_t CompilerGLSL::type_to_std430_alignment(const SPIRType &type, uint64_t flags)
{
// float, int and uint all take 4 bytes.
const uint32_t base_alignment = 4;
if (type.basetype == SPIRType::Struct)
{
// Rule 9. Structs alignments are maximum alignment of its members.
uint32_t alignment = 0;
for (uint32_t i = 0; i < type.member_types.size(); i++)
{
auto member_flags = meta[type.self].members.at(i).decoration_flags;
alignment = max(alignment,
type_to_std430_alignment(get<SPIRType>(type.member_types[i]), member_flags));
}
return alignment;
}
else
{
// From 7.6.2.2 in GL 4.5 core spec.
// Rule 1
if (type.vecsize == 1 && type.columns == 1)
return base_alignment;
// Rule 2
if ((type.vecsize == 2 || type.vecsize == 4) && type.columns == 1)
return type.vecsize * base_alignment;
// Rule 3
if (type.vecsize == 3 && type.columns == 1)
return 4 * base_alignment;
// Rule 4 implied. Alignment does not change in std430.
// Rule 5. Column-major matrices are stored as arrays of
// vectors.
if ((flags & (1ull << DecorationColMajor)) && type.columns > 1)
{
if (type.vecsize == 3)
return 4 * base_alignment;
else
return type.vecsize * base_alignment;
}
// Rule 6 implied.
// Rule 7.
if ((flags & (1ull << DecorationRowMajor)) && type.vecsize > 1)
{
if (type.columns == 3)
return 4 * base_alignment;
else
return type.columns * base_alignment;
}
// Rule 8 implied.
}
throw CompilerError("Did not find suitable std430 rule for type. Bogus decorations?");
}
uint32_t CompilerGLSL::type_to_std430_array_stride(const SPIRType &type, uint64_t flags)
{
// Array stride is equal to aligned size of the underlying type.
SPIRType tmp = type;
tmp.array.pop_back();
uint32_t size = type_to_std430_size(tmp, flags);
uint32_t alignment = type_to_std430_alignment(tmp, flags);
return (size + alignment - 1) & ~(alignment - 1);
}
uint32_t CompilerGLSL::type_to_std430_size(const SPIRType &type, uint64_t flags)
{
if (!type.array.empty())
return type.array.back() * type_to_std430_array_stride(type, flags);
// float, int and uint all take 4 bytes.
const uint32_t base_alignment = 4;
uint32_t size = 0;
if (type.basetype == SPIRType::Struct)
{
for (uint32_t i = 0; i < type.member_types.size(); i++)
{
auto member_flags = meta[type.self].members.at(i).decoration_flags;
auto &member_type = get<SPIRType>(type.member_types[i]);
uint32_t alignment = type_to_std430_alignment(member_type, member_flags);
size = (size + alignment - 1) & ~(alignment - 1);
size += type_to_std430_size(member_type, member_flags);
}
}
else
{
if (type.columns == 1)
size = type.vecsize * base_alignment;
if ((flags & (1ull << DecorationColMajor)) && type.columns > 1)
{
if (type.vecsize == 3)
size = type.columns * 4 * base_alignment;
else
size = type.columns * type.vecsize * base_alignment;
}
if ((flags & (1ull << DecorationRowMajor)) && type.vecsize > 1)
{
if (type.columns == 3)
size = type.vecsize * 4 * base_alignment;
else
size = type.vecsize * type.columns * base_alignment;
}
}
return size;
}
bool CompilerGLSL::ssbo_is_std430_packing(const SPIRType &type)
{
// This is very tricky and error prone, but try to be exhaustive and correct here.
// SPIR-V doesn't directly say if we're using std430 or std140.
// SPIR-V communicates this using Offset and ArrayStride decorations (which is what really matters),
// so we have to try to infer whether or not the original GLSL source was std140 or std430 based on this information.
// We do not have to consider shared or packed since these layouts are not allowed in Vulkan SPIR-V (they are useless anyways, and custom offsets would do the same thing).
//
// It is almost certain that we're using std430, but it gets tricky with arrays in particular.
// We will assume std430, but infer std140 if we can prove the struct is not compliant with std430.
//
// The only two differences between std140 and std430 are related to padding alignment/array stride
// in arrays and structs. In std140 they take minimum vec4 alignment.
// std430 only removes the vec4 requirement.
uint32_t offset = 0;
for (uint32_t i = 0; i < type.member_types.size(); i++)
{
auto &memb_type = get<SPIRType>(type.member_types[i]);
auto member_flags = meta[type.self].members.at(i).decoration_flags;
// Verify alignment rules.
uint32_t std430_alignment = type_to_std430_alignment(memb_type, member_flags);
offset = (offset + std430_alignment - 1) & ~(std430_alignment - 1);
uint32_t actual_offset = type_struct_member_offset(type, i);
if (actual_offset != offset) // This cannot be std430.
return false;
// Verify array stride rules.
if (!memb_type.array.empty() &&
type_to_std430_array_stride(memb_type, member_flags) !=
type_struct_member_array_stride(type, i))
return false;
// Verify that sub-structs also follow std430 rules.
if (!memb_type.member_types.empty() &&
!ssbo_is_std430_packing(memb_type))
return false;
// Bump size.
offset += type_to_std430_size(memb_type, member_flags);
}
return true;
}
string CompilerGLSL::layout_for_variable(const SPIRVariable &var)
{
vector<string> attr;
auto &dec = meta[var.self].decoration;
auto &type = get<SPIRType>(var.basetype);
auto flags = dec.decoration_flags;
auto typeflags = meta[type.self].decoration.decoration_flags;
if (flags & (1ull << DecorationRowMajor))
attr.push_back("row_major");
if (flags & (1ull << DecorationColMajor))
attr.push_back("column_major");
if (flags & (1ull << DecorationLocation))
attr.push_back(join("location = ", dec.location));
if ((flags & (1ull << DecorationDescriptorSet)) && dec.set != 0) // set = 0 is the default.
attr.push_back(join("set = ", dec.set));
if (flags & (1ull << DecorationBinding))
attr.push_back(join("binding = ", dec.binding));
if (flags & (1ull << DecorationCoherent))
attr.push_back("coherent");
if (flags & (1ull << DecorationOffset))
attr.push_back(join("offset = ", dec.offset));
// Instead of adding explicit offsets for every element here, just assume we're using std140 or std430.
// If SPIR-V does not comply with either layout, we cannot really work around it.
if (var.storage == StorageClassUniform &&
(typeflags & (1ull << DecorationBlock)))
attr.push_back("std140");
if (var.storage == StorageClassUniform &&
(typeflags & (1ull << DecorationBufferBlock)))
attr.push_back(ssbo_is_std430_packing(type) ? "std430" : "std140");
// For images, the type itself adds a layout qualifer.
if (type.basetype == SPIRType::Image)
{
const char *fmt = format_to_glsl(type.image.format);
if (fmt)
attr.push_back(fmt);
}
if (attr.empty())
return "";
string res = "layout(";
res += merge(attr);
res += ") ";
return res;
}
void CompilerGLSL::emit_push_constant_block(const SPIRVariable &var)
{
// OpenGL has no concept of push constant blocks, implement it as a uniform struct.
auto &type = get<SPIRType>(var.basetype);
auto &flags = meta[var.self].decoration.decoration_flags;
flags &= ~((1ull << DecorationBinding) | (1ull << DecorationDescriptorSet));
#if 0
if (flags & ((1ull << DecorationBinding) | (1ull << DecorationDescriptorSet)))
throw CompilerError("Push constant blocks cannot be compiled to GLSL with Binding or Set syntax. "
"Remap to location with reflection API first or disable these decorations.");
#endif
// We're emitting the push constant block as a regular struct, so disable the block qualifier temporarily.
// Otherwise, we will end up emitting layout() qualifiers on naked structs which is not allowed.
auto &block_flags = meta[type.self].decoration.decoration_flags;
uint64_t block_flag = block_flags & (1ull << DecorationBlock);
block_flags &= ~block_flag;
emit_struct(type);
block_flags |= block_flag;
emit_uniform(var);
statement("");
}
void CompilerGLSL::emit_buffer_block(const SPIRVariable &var)
{
auto &type = get<SPIRType>(var.basetype);
auto ssbo = meta[type.self].decoration.decoration_flags & (1ull << DecorationBufferBlock);
auto buffer_name = to_name(type.self);
statement(layout_for_variable(var) + (ssbo ? "buffer " : "uniform ") + buffer_name);
begin_scope();
uint32_t i = 0;
for (auto &member : type.member_types)
{
auto &membertype = get<SPIRType>(member);
statement(member_decl(type, membertype, i), ";");
i++;
}
end_scope_decl(to_name(var.self) + type_to_array_glsl(type));
statement("");
}
void CompilerGLSL::emit_interface_block(const SPIRVariable &var)
{
auto &type = get<SPIRType>(var.basetype);
// Either make it plain in/out or in/out blocks depending on what shader is doing ...
bool block = (meta[type.self].decoration.decoration_flags & (1ull << DecorationBlock)) != 0;
const char *qual = nullptr;
if (is_legacy() && execution.model == ExecutionModelVertex)
qual = var.storage == StorageClassInput ? "attribute " : "varying ";
else if (is_legacy() && execution.model == ExecutionModelFragment)
qual = "varying "; // Fragment outputs are renamed so they never hit this case.
else
qual = var.storage == StorageClassInput ? "in " : "out ";
if (block)
{
statement(layout_for_variable(var), qual, to_name(type.self));
begin_scope();
uint32_t i = 0;
for (auto &member : type.member_types)
{
auto &membertype = get<SPIRType>(member);
statement(member_decl(type, membertype, i), ";");
i++;
}
end_scope_decl(join(to_name(var.self), type_to_array_glsl(type)));
statement("");
}
else
{
statement(layout_for_variable(var), qual, variable_decl(var), ";");
}
}
void CompilerGLSL::emit_uniform(const SPIRVariable &var)
{
auto &type = get<SPIRType>(var.basetype);
if (type.basetype == SPIRType::Image)
{
if (!options.es && options.version < 420)
require_extension("GL_ARB_shader_image_load_store");
else if (options.es && options.version < 310)
throw CompilerError("At least ESSL 3.10 required for shader image load store.");
}
statement(layout_for_variable(var), "uniform ", variable_decl(var), ";");
}
void CompilerGLSL::replace_fragment_output(SPIRVariable &var)
{
auto &m = meta[var.self].decoration;
uint32_t location = 0;
if (m.decoration_flags & (1ull << DecorationLocation))
location = m.location;
m.alias = join("gl_FragData[", location, "]");
var.compat_builtin = true; // We don't want to declare this variable, but use the name as-is.
}
void CompilerGLSL::replace_fragment_outputs()
{
for (auto &id : ids)
{
if (id.get_type() == TypeVariable)
{
auto &var = id.get<SPIRVariable>();
auto &type = get<SPIRType>(var.basetype);
if (!is_builtin_variable(var) && !var.remapped_variable && type.pointer && var.storage == StorageClassOutput)
replace_fragment_output(var);
}
}
}
string CompilerGLSL::remap_swizzle(uint32_t result_type, uint32_t input_components, uint32_t expr)
{
auto &out_type = get<SPIRType>(result_type);
if (out_type.vecsize == input_components)
return to_expression(expr);
else if (input_components == 1)
return join(type_to_glsl(out_type), "(", to_expression(expr), ")");
else
{
auto e = to_expression(expr) + ".";
// Just clamp the swizzle index if we have more outputs than inputs.
for (uint32_t c = 0; c < out_type.vecsize; c++)
e += index_to_swizzle(min(c, input_components - 1));
if (backend.swizzle_is_function && out_type.vecsize > 1)
e += "()";
return e;
}
}
void CompilerGLSL::emit_pls()
{
if (execution.model != ExecutionModelFragment)
throw CompilerError("Pixel local storage only supported in fragment shaders.");
if (!options.es)
throw CompilerError("Pixel local storage only supported in OpenGL ES.");
if (options.version < 300)
throw CompilerError("Pixel local storage only supported in ESSL 3.0 and above.");
if (!pls_inputs.empty())
{
statement("__pixel_local_inEXT _PLSIn");
begin_scope();
for (auto &input : pls_inputs)
statement(pls_decl(input), ";");
end_scope_decl();
statement("");
}
if (!pls_outputs.empty())
{
statement("__pixel_local_outEXT _PLSOut");
begin_scope();
for (auto &output : pls_outputs)
statement(pls_decl(output), ";");
end_scope_decl();
statement("");
}
}
void CompilerGLSL::emit_resources()
{
// Legacy GL uses gl_FragData[], redeclare all fragment outputs
// with builtins.
if (execution.model == ExecutionModelFragment && is_legacy())
replace_fragment_outputs();
// Emit PLS blocks if we have such variables.
if (!pls_inputs.empty() || !pls_outputs.empty())
emit_pls();
// Output all basic struct types which are not Block or BufferBlock as these are declared inplace
// when such variables are instantiated.
for (auto &id : ids)
{
if (id.get_type() == TypeType)
{
auto &type = id.get<SPIRType>();
if (type.basetype == SPIRType::Struct &&
type.array.empty() &&
!type.pointer &&
(meta[type.self].decoration.decoration_flags & ((1ull << DecorationBlock) | (1ull << DecorationBufferBlock))) == 0)
{
emit_struct(type);
}
}
}
// Output UBOs and SSBOs
for (auto &id : ids)
{
if (id.get_type() == TypeVariable)
{
auto &var = id.get<SPIRVariable>();
auto &type = get<SPIRType>(var.basetype);
if (type.pointer && type.storage == StorageClassUniform &&
!is_builtin_variable(var) &&
(meta[type.self].decoration.decoration_flags & ((1ull << DecorationBlock) | (1ull << DecorationBufferBlock))))
{
emit_buffer_block(var);
}
}
}
// Output push constant blocks
for (auto &id : ids)
{
if (id.get_type() == TypeVariable)
{
auto &var = id.get<SPIRVariable>();
auto &type = get<SPIRType>(var.basetype);
if (type.pointer && type.storage == StorageClassPushConstant)
emit_push_constant_block(var);
}
}
bool emitted = false;
// Output Uniform Constants (values, samplers, images, etc).
for (auto &id : ids)
{
if (id.get_type() == TypeVariable)
{
auto &var = id.get<SPIRVariable>();
auto &type = get<SPIRType>(var.basetype);
if (!is_builtin_variable(var) && !var.remapped_variable && type.pointer &&
(type.storage == StorageClassUniformConstant || type.storage == StorageClassAtomicCounter))
{
emit_uniform(var);
emitted = true;
}
}
}
if (emitted)
statement("");
emitted = false;
// Output in/out interfaces.
for (auto &id : ids)
{
if (id.get_type() == TypeVariable)
{
auto &var = id.get<SPIRVariable>();
auto &type = get<SPIRType>(var.basetype);
if (!is_builtin_variable(var) &&
!var.remapped_variable &&
type.pointer &&
(var.storage == StorageClassInput || var.storage == StorageClassOutput))
{
emit_interface_block(var);
emitted = true;
}
else if (is_builtin_variable(var))
{
// For gl_InstanceIndex emulation on GLES, the API user needs to
// supply this uniform.
if (meta[var.self].decoration.builtin_type == BuiltInInstanceIndex)
{
statement("uniform int SPIRV_Cross_BaseInstance;");
emitted = true;
}
}
}
}
// Global variables.
for (auto global : global_variables)
{
auto &var = get<SPIRVariable>(global);
if (var.storage != StorageClassOutput)
{
statement(variable_decl(var), ";");
emitted = true;
}
}
if (emitted)
statement("");
}
string CompilerGLSL::to_expression(uint32_t id)
{
auto itr = invalid_expressions.find(id);
if (itr != end(invalid_expressions))
{
auto &expr = get<SPIRExpression>(id);
// This expression has been invalidated in the past.
// Be careful with this expression next pass ...
// Used for OpCompositeInsert forwarding atm.
expr.used_while_invalidated = true;
// We tried to read an invalidated expression.
// This means we need another pass at compilation, but next time, do not try to forward
// the variables which caused invalidation to happen in the first place.
for (auto var : expr.invalidated_by)
{
//fprintf(stderr, "Expression %u was invalidated due to variable %u being invalid at read time!\n", id, var);
get<SPIRVariable>(var).forwardable = false;
}
if (expr.invalidated_by.empty() && expr.loaded_from)
{
//fprintf(stderr, "Expression %u was invalidated due to variable %u being invalid at read time!\n", id, expr.loaded_from);
get<SPIRVariable>(expr.loaded_from).forwardable = false;
}
force_recompile = true;
}
track_expression_read(id);
switch (ids[id].get_type())
{
case TypeExpression:
{
auto &e = get<SPIRExpression>(id);
if (e.base_expression)
return to_expression(e.base_expression) + e.expression;
else
return e.expression;
}
case TypeConstant:
return constant_expression(get<SPIRConstant>(id));
case TypeVariable:
{
auto &var = get<SPIRVariable>(id);
if (var.statically_assigned)
return to_expression(var.static_expression);
else if (var.deferred_declaration)
{
var.deferred_declaration = false;
return variable_decl(var);
}
else
{
auto &dec = meta[var.self].decoration;
if (dec.builtin)
return builtin_to_glsl(dec.builtin_type);
else
return to_name(id);
}
}
default:
return to_name(id);
}
}
string CompilerGLSL::constant_expression(const SPIRConstant &c)
{
if (!c.subconstants.empty())
{
// Handles Arrays and structures.
string res = type_to_glsl_constructor(get<SPIRType>(c.constant_type)) + "(";
for (auto &elem : c.subconstants)
{
res += constant_expression(get<SPIRConstant>(elem));
if (&elem != &c.subconstants.back())
res += ", ";
}
res += ")";
return res;
}
else if (c.columns() == 1)
{
return constant_expression_vector(c, 0);
}
else
{
string res = type_to_glsl(get<SPIRType>(c.constant_type)) + "(";
for (uint32_t col = 0; col < c.columns(); col++)
{
res += constant_expression_vector(c, col);
if (col + 1 < c.columns())
res += ", ";
}
res += ")";
return res;
}
}
string CompilerGLSL::constant_expression_vector(const SPIRConstant &c, uint32_t vector)
{
auto type = get<SPIRType>(c.constant_type);
type.columns = 1;
string res;
if (c.vector_size() > 1)
res += type_to_glsl(type) + "(";
bool splat = c.vector_size() > 1;
if (splat)
{
uint32_t ident = c.scalar(vector, 0);
for (uint32_t i = 1; i < c.vector_size(); i++)
if (ident != c.scalar(vector, i))
splat = false;
}
switch (type.basetype)
{
case SPIRType::Float:
if (splat)
{
res += convert_to_string(c.scalar_f32(vector, 0));
if (backend.float_literal_suffix)
res += "f";
}
else
{
for (uint32_t i = 0; i < c.vector_size(); i++)
{
res += convert_to_string(c.scalar_f32(vector, i));
if (backend.float_literal_suffix)
res += "f";
if (i + 1 < c.vector_size())
res += ", ";
}
}
break;
case SPIRType::UInt:
if (splat)
{
res += convert_to_string(c.scalar(vector, 0));
if (backend.uint32_t_literal_suffix)
res += "u";
}
else
{
for (uint32_t i = 0; i < c.vector_size(); i++)
{
res += convert_to_string(c.scalar(vector, i));
if (backend.uint32_t_literal_suffix)
res += "u";
if (i + 1 < c.vector_size())
res += ", ";
}
}
break;
case SPIRType::Int:
if (splat)
res += convert_to_string(c.scalar_i32(vector, 0));
else
{
for (uint32_t i = 0; i < c.vector_size(); i++)
{
res += convert_to_string(c.scalar_i32(vector, i));
if (i + 1 < c.vector_size())
res += ", ";
}
}
break;
case SPIRType::Bool:
if (splat)
res += c.scalar(vector, 0) ? "true" : "false";
else
{
for (uint32_t i = 0; i < c.vector_size(); i++)
{
res += c.scalar(vector, i) ? "true" : "false";
if (i + 1 < c.vector_size())
res += ", ";
}
}
break;
default:
throw CompilerError("Invalid constant expression basetype.");
}
if (c.vector_size() > 1)
res += ")";
return res;
}
string CompilerGLSL::declare_temporary(uint32_t result_type, uint32_t result_id)
{
auto &type = get<SPIRType>(result_type);
auto flags = meta[result_id].decoration.decoration_flags;
// If we're declaring temporaries inside continue blocks,
// we must declare the temporary in the loop header so that the continue block can avoid declaring new variables.
if (current_continue_block)
{
auto &header = get<SPIRBlock>(current_continue_block->loop_dominator);
if (find_if(begin(header.declare_temporary), end(header.declare_temporary),
[result_type, result_id](const pair<uint32_t, uint32_t> &tmp) {
return tmp.first == result_type && tmp.second == result_id;
}) == end(header.declare_temporary))
{
header.declare_temporary.emplace_back(result_type, result_id);
force_recompile = true;
}
return join(to_name(result_id), " = ");
}
else
{
// The result_id has not been made into an expression yet, so use flags interface.
return join(flags_to_precision_qualifiers_glsl(type, flags),
type_to_glsl(type), " ", to_name(result_id), type_to_array_glsl(type), " = ");
}
}
bool CompilerGLSL::expression_is_forwarded(uint32_t id)
{
return forwarded_temporaries.find(id) != end(forwarded_temporaries);
}
SPIRExpression& CompilerGLSL::emit_op(uint32_t result_type, uint32_t result_id, const string &rhs,
bool forwarding, bool extra_parens, bool suppress_usage_tracking)
{
if (forwarding && (forced_temporaries.find(result_id) == end(forced_temporaries)))
{
// Just forward it without temporary.
// If the forward is trivial, we do not force flushing to temporary for this expression.
if (!suppress_usage_tracking)
forwarded_temporaries.insert(result_id);
if (extra_parens)
return set<SPIRExpression>(result_id, join("(", rhs, ")"), result_type, true);
else
return set<SPIRExpression>(result_id, rhs, result_type, true);
}
else
{
// If expression isn't immutable, bind it to a temporary and make the new temporary immutable (they always are).
statement(declare_temporary(result_type, result_id), rhs, ";");
return set<SPIRExpression>(result_id, to_name(result_id), result_type, true);
}
}
void CompilerGLSL::emit_unary_op(uint32_t result_type, uint32_t result_id, uint32_t op0, const char *op)
{
emit_op(result_type, result_id, join(op, to_expression(op0)), should_forward(op0), true);
}
void CompilerGLSL::emit_binary_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, const char *op)
{
emit_op(result_type, result_id, join(bitcast_glsl(result_type, op0), " ", op, " ", bitcast_glsl(result_type, op1)),
should_forward(op0) && should_forward(op1), true);
}
void CompilerGLSL::emit_unary_func_op(uint32_t result_type, uint32_t result_id, uint32_t op0, const char *op)
{
emit_op(result_type, result_id, join(op, "(", to_expression(op0), ")"), should_forward(op0), false);
}
void CompilerGLSL::emit_binary_func_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, const char *op)
{
emit_op(result_type, result_id, join(op, "(", to_expression(op0), ", ", to_expression(op1), ")"),
should_forward(op0) && should_forward(op1), false);
}
void CompilerGLSL::emit_trinary_func_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, uint32_t op2, const char *op)
{
emit_op(result_type, result_id, join(op, "(", to_expression(op0), ", ", to_expression(op1), ", ", to_expression(op2), ")"),
should_forward(op0) && should_forward(op1) && should_forward(op2), false);
}
void CompilerGLSL::emit_quaternary_func_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, uint32_t op2, uint32_t op3, const char *op)
{
emit_op(result_type, result_id, join(op, "(", to_expression(op0), ", ", to_expression(op1), ", ", to_expression(op2), ", ", to_expression(op3), ")"),
should_forward(op0) && should_forward(op1) && should_forward(op2) && should_forward(op3), false);
}
string CompilerGLSL::legacy_tex_op(const std::string &op,
const SPIRType &imgtype)
{
const char *type;
switch (imgtype.image.dim)
{
case spv::Dim1D: type = "1D"; break;
case spv::Dim2D: type = "2D"; break;
case spv::Dim3D: type = "3D"; break;
case spv::DimCube: type = "Cube"; break;
case spv::DimBuffer: type = "Buffer"; break;
case spv::DimSubpassData: type = "2D"; break;
default: type = ""; break;
}
if (op == "texture")
return join("texture", type);
else if (op == "textureLod")
return join("texture", type, "Lod");
else if (op == "textureProj")
return join("texture", type, "Proj");
else if (op == "textureProjLod")
return join("texture", type, "ProjLod");
else
throw CompilerError(join("Unsupported legacy texture op: ", op));
}
void CompilerGLSL::emit_mix_op(uint32_t result_type, uint32_t id,
uint32_t left, uint32_t right, uint32_t lerp)
{
auto &lerptype = expression_type(lerp);
auto &restype = get<SPIRType>(result_type);
bool has_boolean_mix = (options.es && options.version >= 310) ||
(!options.es && options.version >= 450);
// Boolean mix not supported on desktop without extension.
// Was added in OpenGL 4.5 with ES 3.1 compat.
if (!has_boolean_mix && lerptype.basetype == SPIRType::Bool)
{
// Could use GL_EXT_shader_integer_mix on desktop at least,
// but Apple doesn't support it. :(
// Just implement it as ternary expressions.
string expr;
if (lerptype.vecsize == 1)
expr = join(to_expression(lerp), " ? ", to_expression(right), " : ", to_expression(left));
else
{
auto swiz = [this](uint32_t id, uint32_t i) {
return join(to_expression(id), ".", index_to_swizzle(i));
};
expr = type_to_glsl_constructor(restype);
expr += "(";
for (uint32_t i = 0; i < restype.vecsize; i++)
{
expr += swiz(lerp, i);
expr += " ? ";
expr += swiz(right, i);
expr += " : ";
expr += swiz(left, i);
if (i + 1 < restype.vecsize)
expr += ", ";
}
expr += ")";
}
emit_op(result_type, id, expr,
should_forward(left) &&
should_forward(right) &&
should_forward(lerp),
false);
}
else
emit_trinary_func_op(result_type, id, left, right, lerp, "mix");
}
void CompilerGLSL::emit_texture_op(const Instruction &i)
{
auto ops = stream(i.offset);
auto op = static_cast<Op>(i.op);
uint32_t length = i.length;
if (i.offset + length > spirv.size())
throw CompilerError("Compiler::parse() opcode out of range.");
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t img = ops[2];
uint32_t coord = ops[3];
uint32_t dref = 0;
uint32_t comp = 0;
bool gather = false;
bool proj = false;
const uint32_t *opt = nullptr;
switch (op)
{
case OpImageSampleDrefImplicitLod:
case OpImageSampleDrefExplicitLod:
dref = ops[4];
opt = &ops[5];
length -= 5;
break;
case OpImageSampleProjDrefImplicitLod:
case OpImageSampleProjDrefExplicitLod:
dref = ops[4];
proj = true;
opt = &ops[5];
length -= 5;
break;
case OpImageDrefGather:
dref = ops[4];
opt = &ops[5];
gather = true;
length -= 5;
break;
case OpImageGather:
comp = ops[4];
opt = &ops[5];
gather = true;
length -= 5;
break;
case OpImageSampleProjImplicitLod:
case OpImageSampleProjExplicitLod:
opt = &ops[4];
length -= 4;
proj = true;
break;
default:
opt = &ops[4];
length -= 4;
break;
}
auto &imgtype = expression_type(img);
uint32_t coord_components = 0;
switch (imgtype.image.dim)
{
case spv::Dim1D: coord_components = 1; break;
case spv::Dim2D: coord_components = 2; break;
case spv::Dim3D: coord_components = 3; break;
case spv::DimCube: coord_components = 3; break;
case spv::DimBuffer: coord_components = 1; break;
default: coord_components = 2; break;
}
if (proj)
coord_components++;
if (imgtype.image.arrayed)
coord_components++;
uint32_t bias = 0;
uint32_t lod = 0;
uint32_t grad_x = 0;
uint32_t grad_y = 0;
uint32_t coffset = 0;
uint32_t offset = 0;
uint32_t coffsets = 0;
uint32_t sample = 0;
uint32_t flags = 0;
if (length)
{
flags = opt[0];
opt++;
length--;
}
auto test = [&](uint32_t &v, uint32_t flag) {
if (length && (flags & flag))
{
v = *opt++;
length--;
}
};
test(bias, ImageOperandsBiasMask);
test(lod, ImageOperandsLodMask);
test(grad_x, ImageOperandsGradMask);
test(grad_y, ImageOperandsGradMask);
test(coffset, ImageOperandsConstOffsetMask);
test(offset, ImageOperandsOffsetMask);
test(coffsets, ImageOperandsConstOffsetsMask);
test(sample, ImageOperandsSampleMask);
string expr;
string texop;
if (op == OpImageFetch)
texop += "texelFetch";
else
{
texop += "texture";
if (gather)
texop += "Gather";
if (coffsets)
texop += "Offsets";
if (proj)
texop += "Proj";
if (grad_x || grad_y)
texop += "Grad";
if (lod)
texop += "Lod";
}
if (coffset || offset)
texop += "Offset";
if (is_legacy())
texop = legacy_tex_op(texop, imgtype);
expr += texop;
expr += "(";
expr += to_expression(img);
bool swizz_func = backend.swizzle_is_function;
auto swizzle = [swizz_func](uint32_t comps, uint32_t in_comps) -> const char* {
if (comps == in_comps)
return "";
switch (comps)
{
case 1: return ".x";
case 2: return swizz_func ? ".xy()" : ".xy";
case 3: return swizz_func ? ".xyz()" :".xyz";
default: return "";
}
};
bool forward = should_forward(coord);
// The IR can give us more components than we need, so chop them off as needed.
auto coord_expr = to_expression(coord) + swizzle(coord_components, expression_type(coord).vecsize);
// TODO: implement rest ... A bit intensive.
if (dref)
{
forward = forward && should_forward(dref);
// SPIR-V splits dref and coordinate.
if (coord_components == 4) // GLSL also splits the arguments in two.
{
expr += ", ";
expr += to_expression(coord);
expr += ", ";
expr += to_expression(dref);
}
else
{
// Create a composite which merges coord/dref into a single vector.
auto type = expression_type(coord);
type.vecsize = coord_components + 1;
expr += ", ";
expr += type_to_glsl_constructor(type);
expr += "(";
expr += coord_expr;
expr += ", ";
expr += to_expression(dref);
expr += ")";
}
}
else
{
expr += ", ";
expr += coord_expr;
}
if (grad_x || grad_y)
{
forward = forward && should_forward(grad_x);
forward = forward && should_forward(grad_y);
expr += ", ";
expr += to_expression(grad_x);
expr += ", ";
expr += to_expression(grad_y);
}
if (lod)
{
forward = forward && should_forward(lod);
expr += ", ";
expr += to_expression(lod);
}
if (coffset)
{
forward = forward && should_forward(coffset);
expr += ", ";
expr += to_expression(coffset);
}
else if (offset)
{
forward = forward && should_forward(offset);
expr += ", ";
expr += to_expression(offset);
}
if (bias)
{
forward = forward && should_forward(bias);
expr += ", ";
expr += to_expression(bias);
}
if (comp)
{
forward = forward && should_forward(comp);
expr += ", ";
expr += to_expression(comp);
}
expr += ")";
emit_op(result_type, id, expr, forward, false);
}
void CompilerGLSL::emit_glsl_op(uint32_t result_type, uint32_t id, uint32_t eop, const uint32_t *args, uint32_t)
{
GLSLstd450 op = static_cast<GLSLstd450>(eop);
switch (op)
{
// FP fiddling
case GLSLstd450Round:
case GLSLstd450RoundEven:
emit_unary_func_op(result_type, id, args[0], "round");
break;
case GLSLstd450Trunc:
emit_unary_func_op(result_type, id, args[0], "trunc");
break;
case GLSLstd450SAbs:
case GLSLstd450FAbs:
emit_unary_func_op(result_type, id, args[0], "abs");
break;
case GLSLstd450SSign:
case GLSLstd450FSign:
emit_unary_func_op(result_type, id, args[0], "sign");
break;
case GLSLstd450Floor:
emit_unary_func_op(result_type, id, args[0], "floor");
break;
case GLSLstd450Ceil:
emit_unary_func_op(result_type, id, args[0], "ceil");
break;
case GLSLstd450Fract:
emit_unary_func_op(result_type, id, args[0], "fract");
break;
case GLSLstd450Radians:
emit_unary_func_op(result_type, id, args[0], "radians");
break;
case GLSLstd450Degrees:
emit_unary_func_op(result_type, id, args[0], "degrees");
break;
case GLSLstd450Fma:
emit_trinary_func_op(result_type, id, args[0], args[1], args[2], "fma");
break;
case GLSLstd450Modf:
register_call_out_argument(args[1]);
forced_temporaries.insert(id);
emit_binary_func_op(result_type, id, args[0], args[1], "modf");
break;
// Minmax
case GLSLstd450FMin:
case GLSLstd450UMin:
case GLSLstd450SMin:
emit_binary_func_op(result_type, id, args[0], args[1], "min");
break;
case GLSLstd450FMax:
case GLSLstd450UMax:
case GLSLstd450SMax:
emit_binary_func_op(result_type, id, args[0], args[1], "max");
break;
case GLSLstd450FClamp:
case GLSLstd450UClamp:
case GLSLstd450SClamp:
emit_trinary_func_op(result_type, id, args[0], args[1], args[2], "clamp");
break;
// Trig
case GLSLstd450Sin:
emit_unary_func_op(result_type, id, args[0], "sin");
break;
case GLSLstd450Cos:
emit_unary_func_op(result_type, id, args[0], "cos");
break;
case GLSLstd450Tan:
emit_unary_func_op(result_type, id, args[0], "tan");
break;
case GLSLstd450Asin:
emit_unary_func_op(result_type, id, args[0], "asin");
break;
case GLSLstd450Acos:
emit_unary_func_op(result_type, id, args[0], "acos");
break;
case GLSLstd450Atan:
emit_unary_func_op(result_type, id, args[0], "atan");
break;
case GLSLstd450Sinh:
emit_unary_func_op(result_type, id, args[0], "sinh");
break;
case GLSLstd450Cosh:
emit_unary_func_op(result_type, id, args[0], "cosh");
break;
case GLSLstd450Tanh:
emit_unary_func_op(result_type, id, args[0], "tanh");
break;
case GLSLstd450Asinh:
emit_unary_func_op(result_type, id, args[0], "asinh");
break;
case GLSLstd450Acosh:
emit_unary_func_op(result_type, id, args[0], "acosh");
break;
case GLSLstd450Atanh:
emit_unary_func_op(result_type, id, args[0], "atanh");
break;
case GLSLstd450Atan2:
emit_binary_func_op(result_type, id, args[0], args[1], "atan");
break;
// Exponentials
case GLSLstd450Pow:
emit_binary_func_op(result_type, id, args[0], args[1], "pow");
break;
case GLSLstd450Exp:
emit_unary_func_op(result_type, id, args[0], "exp");
break;
case GLSLstd450Log:
emit_unary_func_op(result_type, id, args[0], "log");
break;
case GLSLstd450Exp2:
emit_unary_func_op(result_type, id, args[0], "exp2");
break;
case GLSLstd450Log2:
emit_unary_func_op(result_type, id, args[0], "log2");
break;
case GLSLstd450Sqrt:
emit_unary_func_op(result_type, id, args[0], "sqrt");
break;
case GLSLstd450InverseSqrt:
emit_unary_func_op(result_type, id, args[0], "inversesqrt");
break;
// Matrix math
case GLSLstd450Determinant:
emit_unary_func_op(result_type, id, args[0], "determinant");
break;
case GLSLstd450MatrixInverse:
emit_unary_func_op(result_type, id, args[0], "inverse");
break;
// Lerping
case GLSLstd450FMix:
case GLSLstd450IMix:
{
emit_mix_op(result_type, id, args[0], args[1], args[2]);
break;
}
case GLSLstd450Step:
emit_binary_func_op(result_type, id, args[0], args[1], "step");
break;
case GLSLstd450SmoothStep:
emit_trinary_func_op(result_type, id, args[0], args[1], args[2], "smoothstep");
break;
// Packing
case GLSLstd450Frexp:
register_call_out_argument(args[1]);
forced_temporaries.insert(id);
emit_binary_func_op(result_type, id, args[0], args[1], "frexp");
break;
case GLSLstd450Ldexp:
emit_binary_func_op(result_type, id, args[0], args[1], "ldexp");
break;
case GLSLstd450PackSnorm4x8:
emit_unary_func_op(result_type, id, args[0], "packSnorm4x8");
break;
case GLSLstd450PackUnorm4x8:
emit_unary_func_op(result_type, id, args[0], "packUnorm4x8");
break;
case GLSLstd450PackSnorm2x16:
emit_unary_func_op(result_type, id, args[0], "packSnorm2x16");
break;
case GLSLstd450PackUnorm2x16:
emit_unary_func_op(result_type, id, args[0], "packUnorm2x16");
break;
case GLSLstd450PackHalf2x16:
emit_unary_func_op(result_type, id, args[0], "packHalf2x16");
break;
case GLSLstd450UnpackSnorm4x8:
emit_unary_func_op(result_type, id, args[0], "unpackSnorm4x8");
break;
case GLSLstd450UnpackUnorm4x8:
emit_unary_func_op(result_type, id, args[0], "unpackUnorm4x8");
break;
case GLSLstd450UnpackSnorm2x16:
emit_unary_func_op(result_type, id, args[0], "unpackSnorm2x16");
break;
case GLSLstd450UnpackUnorm2x16:
emit_unary_func_op(result_type, id, args[0], "unpackUnorm2x16");
break;
case GLSLstd450UnpackHalf2x16:
emit_unary_func_op(result_type, id, args[0], "unpackHalf2x16");
break;
// Vector math
case GLSLstd450Length:
emit_unary_func_op(result_type, id, args[0], "length");
break;
case GLSLstd450Distance:
emit_binary_func_op(result_type, id, args[0], args[1], "distance");
break;
case GLSLstd450Cross:
emit_binary_func_op(result_type, id, args[0], args[1], "cross");
break;
case GLSLstd450Normalize:
emit_unary_func_op(result_type, id, args[0], "normalize");
break;
case GLSLstd450FaceForward:
emit_trinary_func_op(result_type, id, args[0], args[1], args[2], "faceforward");
break;
case GLSLstd450Reflect:
emit_binary_func_op(result_type, id, args[0], args[1], "reflect");
break;
case GLSLstd450Refract:
emit_trinary_func_op(result_type, id, args[0], args[1], args[2], "refract");
break;
// Bit-fiddling
case GLSLstd450FindILsb:
emit_unary_func_op(result_type, id, args[0], "findLSB");
break;
case GLSLstd450FindSMsb:
case GLSLstd450FindUMsb:
emit_unary_func_op(result_type, id, args[0], "findMSB");
break;
// Multisampled varying
case GLSLstd450InterpolateAtCentroid:
emit_unary_func_op(result_type, id, args[0], "interpolateAtCentroid");
break;
case GLSLstd450InterpolateAtSample:
emit_binary_func_op(result_type, id, args[0], args[1], "interpolateAtSample");
break;
case GLSLstd450InterpolateAtOffset:
emit_binary_func_op(result_type, id, args[0], args[1], "interpolateAtOffset");
break;
default:
statement("// unimplemented GLSL op ", eop);
break;
}
}
string CompilerGLSL::bitcast_glsl_op(uint32_t result_type, uint32_t argument)
{
auto &out_type = get<SPIRType>(result_type);
auto &in_type = expression_type(argument);
if (out_type.basetype == SPIRType::UInt && in_type.basetype == SPIRType::Int)
return type_to_glsl(out_type);
else if (out_type.basetype == SPIRType::UInt && in_type.basetype == SPIRType::Float)
return "floatBitsToUint";
else if (out_type.basetype == SPIRType::Int && in_type.basetype == SPIRType::UInt)
return type_to_glsl(out_type);
else if (out_type.basetype == SPIRType::Int && in_type.basetype == SPIRType::Float)
return "floatBitsToInt";
else if (out_type.basetype == SPIRType::Float && in_type.basetype == SPIRType::UInt)
return "uintBitsToFloat";
else if (out_type.basetype == SPIRType::Float && in_type.basetype == SPIRType::Int)
return "intBitsToFloat";
else
return "";
}
string CompilerGLSL::bitcast_glsl(uint32_t result_type, uint32_t argument)
{
auto op = bitcast_glsl_op(result_type, argument);
if (op.empty())
return to_expression(argument);
else
return join(op, "(", to_expression(argument), ")");
}
string CompilerGLSL::builtin_to_glsl(BuiltIn builtin)
{
switch (builtin)
{
case BuiltInPosition: return "gl_Position";
case BuiltInPointSize: return "gl_PointSize";
case BuiltInVertexId: return "gl_VertexID";
case BuiltInInstanceId: return "gl_InstanceID";
case BuiltInVertexIndex: return "gl_VertexID"; // gl_VertexID already has the base offset applied.
case BuiltInInstanceIndex: return "(gl_InstanceID + SPIRV_Cross_BaseInstance)"; // ... but not gl_InstanceID.
case BuiltInPrimitiveId: return "gl_PrimitiveID";
case BuiltInInvocationId: return "gl_InvocationID";
case BuiltInLayer: return "gl_Layer";
case BuiltInTessLevelOuter: return "gl_TessLevelOuter";
case BuiltInTessLevelInner: return "gl_TessLevelInner";
case BuiltInTessCoord: return "gl_TessCoord";
case BuiltInFragCoord: return "gl_FragCoord";
case BuiltInPointCoord: return "gl_PointCoord";
case BuiltInFrontFacing: return "gl_FrontFacing";
case BuiltInFragDepth: return "gl_FragDepth";
case BuiltInNumWorkgroups: return "gl_NumWorkGroups";
case BuiltInWorkgroupSize: return "gl_WorkGroupSize";
case BuiltInWorkgroupId: return "gl_WorkGroupID";
case BuiltInLocalInvocationId: return "gl_LocalInvocationID";
case BuiltInGlobalInvocationId: return "gl_GlobalInvocationID";
case BuiltInLocalInvocationIndex: return "gl_LocalInvocationIndex";
default: return "gl_???";
}
}
const char* CompilerGLSL::index_to_swizzle(uint32_t index)
{
switch (index)
{
case 0: return "x";
case 1: return "y";
case 2: return "z";
case 3: return "w";
default: throw CompilerError("Swizzle index out of range");
}
}
string CompilerGLSL::access_chain(uint32_t base, const uint32_t *indices, uint32_t count, bool index_is_literal, bool chain_only)
{
string expr;
if (!chain_only)
expr = to_expression(base);
const auto *type = &expression_type(base);
// For resolving array accesses, etc, keep a local copy for poking.
SPIRType temp;
bool access_chain_is_arrayed = false;
for (uint32_t i = 0; i < count; i++)
{
uint32_t index = indices[i];
// Arrays
if (!type->array.empty())
{
expr += "[";
if (index_is_literal)
expr += convert_to_string(index);
else
expr += to_expression(index);
expr += "]";
// We have to modify the type, so keep a local copy.
if (&temp != type)
temp = *type;
type = &temp;
temp.array.pop_back();
access_chain_is_arrayed = true;
}
// For structs, the index refers to a constant, which indexes into the members.
// We also check if this member is a builtin, since we then replace the entire expression with the builtin one.
else if (type->basetype == SPIRType::Struct)
{
if (!index_is_literal)
index = get<SPIRConstant>(index).scalar();
if (index >= type->member_types.size())
throw CompilerError("Member index is out of bounds!");
BuiltIn builtin;
if (is_member_builtin(*type, index, &builtin))
{
// FIXME: We rely here on OpName on gl_in/gl_out to make this work properly.
// To make this properly work by omitting all OpName opcodes,
// we need to infer gl_in or gl_out based on the builtin, and stage.
if (access_chain_is_arrayed)
{
expr += ".";
expr += builtin_to_glsl(builtin);
}
else
expr = builtin_to_glsl(builtin);
}
else
{
expr += ".";
expr += to_member_name(*type, index);
}
type = &get<SPIRType>(type->member_types[index]);
}
// Matrix -> Vector
else if (type->columns > 1)
{
expr += "[";
if (index_is_literal)
expr += convert_to_string(index);
else
expr += to_expression(index);
expr += "]";
// We have to modify the type, so keep a local copy.
if (&temp != type)
temp = *type;
type = &temp;
temp.columns = 1;
}
// Vector -> Scalar
else if (type->vecsize > 1)
{
if (index_is_literal)
{
expr += ".";
expr += index_to_swizzle(index);
}
else if (ids[index].get_type() == TypeConstant)
{
auto &c = get<SPIRConstant>(index);
expr += ".";
expr += index_to_swizzle(c.scalar());
}
else
{
expr += "[";
expr += to_expression(index);
expr += "]";
}
// We have to modify the type, so keep a local copy.
if (&temp != type)
temp = *type;
type = &temp;
temp.vecsize = 1;
}
else
throw CompilerError("Cannot subdivide a scalar value!");
}
return expr;
}
bool CompilerGLSL::should_forward(uint32_t id)
{
return is_immutable(id) &&
!options.force_temporary;
}
void CompilerGLSL::track_expression_read(uint32_t id)
{
// If we try to read a forwarded temporary more than once we will stamp out possibly complex code twice.
// In this case, it's better to just bind the complex expression to the temporary and read that temporary twice.
if (expression_is_forwarded(id))
{
auto &v = expression_usage_counts[id];
v++;
if (v >= 2)
{
//if (v == 2)
// fprintf(stderr, "ID %u was forced to temporary due to more than 1 expression use!\n", id);
forced_temporaries.insert(id);
// Force a recompile after this pass to avoid forwarding this variable.
force_recompile = true;
}
}
}
bool CompilerGLSL::args_will_forward(uint32_t id, const uint32_t *args, uint32_t num_args, bool pure)
{
if (forced_temporaries.find(id) != end(forced_temporaries))
return false;
for (uint32_t i = 0; i < num_args; i++)
if (!should_forward(args[i]))
return false;
// We need to forward globals as well.
if (!pure)
{
for (auto global : global_variables)
if (!should_forward(global))
return false;
for (auto aliased : aliased_variables)
if (!should_forward(aliased))
return false;
}
return true;
}
void CompilerGLSL::register_impure_function_call()
{
// Impure functions can modify globals and aliased variables, so invalidate them as well.
for (auto global : global_variables)
flush_dependees(get<SPIRVariable>(global));
for (auto aliased : aliased_variables)
flush_dependees(get<SPIRVariable>(aliased));
}
void CompilerGLSL::register_call_out_argument(uint32_t id)
{
register_write(id);
auto *var = maybe_get<SPIRVariable>(id);
if (var)
flush_variable_declaration(var->self);
}
void CompilerGLSL::flush_variable_declaration(uint32_t id)
{
auto *var = maybe_get<SPIRVariable>(id);
if (var && var->deferred_declaration)
{
statement(variable_decl(*var), ";");
var->deferred_declaration = false;
}
}
bool CompilerGLSL::remove_duplicate_swizzle(string &op)
{
auto pos = op.find_last_of('.');
if (pos == string::npos || pos == 0)
return false;
string final_swiz = op.substr(pos + 1, string::npos);
if (backend.swizzle_is_function)
{
if (final_swiz.size() < 2)
return false;
if (final_swiz.substr(final_swiz.size() - 2, string::npos) == "()")
final_swiz.erase(final_swiz.size() - 2, string::npos);
else
return false;
}
// Check if final swizzle is of form .x, .xy, .xyz, .xyzw or similar.
// If so, and previous swizzle is of same length,
// we can drop the final swizzle altogether.
for (uint32_t i = 0; i < final_swiz.size(); i++)
{
static const char expected[] = { 'x', 'y', 'z', 'w' };
if (i >= 4 || final_swiz[i] != expected[i])
return false;
}
auto prevpos = op.find_last_of('.', pos - 1);
if (prevpos == string::npos)
return false;
prevpos++;
// Make sure there are only swizzles here ...
for (auto i = prevpos; i < pos; i++)
{
if (op[i] < 'w' || op[i] > 'z')
{
// If swizzles are foo.xyz() like in C++ backend for example, check for that.
if (backend.swizzle_is_function && i + 2 == pos && op[i] == '(' && op[i + 1] == ')')
break;
return false;
}
}
// If original swizzle is large enough, just carve out the components we need.
// E.g. foobar.wyx.xy will turn into foobar.wy.
if (pos - prevpos >= final_swiz.size())
{
op.erase(prevpos + final_swiz.size(), string::npos);
// Add back the function call ...
if (backend.swizzle_is_function)
op += "()";
}
return true;
}
// Optimizes away vector swizzles where we have something like
// vec3 foo;
// foo.xyz <-- swizzle expression does nothing.
// This is a very common pattern after OpCompositeCombine.
bool CompilerGLSL::remove_unity_swizzle(uint32_t base, string &op)
{
auto pos = op.find_last_of('.');
if (pos == string::npos || pos == 0)
return false;
string final_swiz = op.substr(pos + 1, string::npos);
if (backend.swizzle_is_function)
{
if (final_swiz.size() < 2)
return false;
if (final_swiz.substr(final_swiz.size() - 2, string::npos) == "()")
final_swiz.erase(final_swiz.size() - 2, string::npos);
else
return false;
}
// Check if final swizzle is of form .x, .xy, .xyz, .xyzw or similar.
// If so, and previous swizzle is of same length,
// we can drop the final swizzle altogether.
for (uint32_t i = 0; i < final_swiz.size(); i++)
{
static const char expected[] = { 'x', 'y', 'z', 'w' };
if (i >= 4 || final_swiz[i] != expected[i])
return false;
}
auto &type = expression_type(base);
// Sanity checking ...
assert(type.columns == 1 && type.array.empty());
if (type.vecsize == final_swiz.size())
op.erase(pos, string::npos);
return true;
}
string CompilerGLSL::build_composite_combiner(const uint32_t *elems, uint32_t length)
{
uint32_t base = 0;
bool swizzle_optimization = false;
string op;
for (uint32_t i = 0; i < length; i++)
{
auto *e = maybe_get<SPIRExpression>(elems[i]);
// If we're merging another scalar which belongs to the same base
// object, just merge the swizzles to avoid triggering more than 1 expression read as much as possible!
if (e && e->base_expression && e->base_expression == base)
{
// Only supposed to be used for vector swizzle -> scalar.
assert(!e->expression.empty() && e->expression.front() == '.');
op += e->expression.substr(1, string::npos);
swizzle_optimization = true;
}
else
{
// We'll likely end up with duplicated swizzles, e.g.
// foobar.xyz.xyz from patterns like
// OpVectorSwizzle
// OpCompositeExtract x 3
// OpCompositeConstruct 3x + other scalar.
// Just modify op in-place.
if (swizzle_optimization)
{
if (backend.swizzle_is_function)
op += "()";
// Don't attempt to remove unity swizzling if we managed to remove duplicate swizzles.
// The base "foo" might be vec4, while foo.xyz is vec3 (OpVectorShuffle) and looks like a vec3 due to the .xyz tacked on.
// We only want to remove the swizzles if we're certain that the resulting base will be the same vecsize.
// Essentially, we can only remove one set of swizzles, since that's what we have control over ...
// Case 1:
// foo.yxz.xyz: Duplicate swizzle kicks in, giving foo.yxz, we are done.
// foo.yxz was the result of OpVectorShuffle and we don't know the type of foo.
// Case 2:
// foo.xyz: Duplicate swizzle won't kick in.
// If foo is vec3, we can remove xyz, giving just foo.
if (!remove_duplicate_swizzle(op))
remove_unity_swizzle(base, op);
swizzle_optimization = false;
}
if (i)
op += ", ";
op += to_expression(elems[i]);
}
base = e ? e->base_expression : 0;
}
if (swizzle_optimization)
{
if (backend.swizzle_is_function)
op += "()";
if (!remove_duplicate_swizzle(op))
remove_unity_swizzle(base, op);
}
return op;
}
void CompilerGLSL::emit_instruction(const Instruction &i)
{
auto ops = stream(i.offset);
auto op = static_cast<Op>(i.op);
uint32_t length = i.length;
#define BOP(op) emit_binary_op(ops[0], ops[1], ops[2], ops[3], #op)
#define UOP(op) emit_unary_op(ops[0], ops[1], ops[2], #op)
#define QFOP(op) emit_quaternary_func_op(ops[0], ops[1], ops[2], ops[3], ops[4], ops[5], #op)
#define TFOP(op) emit_trinary_func_op(ops[0], ops[1], ops[2], ops[3], ops[4], #op)
#define BFOP(op) emit_binary_func_op(ops[0], ops[1], ops[2], ops[3], #op)
#define UFOP(op) emit_unary_func_op(ops[0], ops[1], ops[2], #op)
switch (op)
{
// Dealing with memory
case OpLoad:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t ptr = ops[2];
flush_variable_declaration(ptr);
// If we're loading from memory that cannot be changed by the shader,
// just forward the expression directly to avoid needless temporaries.
if (should_forward(ptr))
{
set<SPIRExpression>(id, to_expression(ptr), result_type, true);
register_read(id, ptr, true);
}
else
{
// If the variable can be modified after this OpLoad, we cannot just forward the expression.
// We must read it now and store it in a temporary.
emit_op(result_type, id, to_expression(ptr), false, false);
register_read(id, ptr, false);
}
break;
}
case OpInBoundsAccessChain:
case OpAccessChain:
{
auto *var = maybe_get<SPIRVariable>(ops[2]);
if (var)
flush_variable_declaration(var->self);
// If the base is immutable, the access chain pointer must also be.
auto e = access_chain(ops[2], &ops[3], length - 3, false);
auto &expr = set<SPIRExpression>(ops[1], move(e), ops[0], is_immutable(ops[2]));
expr.loaded_from = ops[2];
break;
}
case OpStore:
{
auto *var = maybe_get<SPIRVariable>(ops[0]);
if (var && var->statically_assigned)
var->static_expression = ops[1];
else
{
auto lhs = to_expression(ops[0]);
auto rhs = to_expression(ops[1]);
// It is possible with OpLoad/OpCompositeInsert/OpStore that we get <expr> = <same-expr>.
// For this case, we don't need to invalidate anything and emit any opcode.
if (lhs != rhs)
{
register_write(ops[0]);
statement(lhs, " = ", rhs, ";");
}
}
break;
}
case OpArrayLength:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
auto e = access_chain(ops[2], &ops[3], length - 3, true);
set<SPIRExpression>(id, e + ".length()", result_type, true);
break;
}
// Function calls
case OpFunctionCall:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t func = ops[2];
const auto *arg = &ops[3];
length -= 3;
auto &callee = get<SPIRFunction>(func);
bool pure = function_is_pure(callee);
bool callee_has_out_variables = false;
// Invalidate out variables passed to functions since they can be OpStore'd to.
for (uint32_t i = 0; i < length; i++)
{
if (callee.arguments[i].write_count)
{
register_call_out_argument(arg[i]);
callee_has_out_variables = true;
}
flush_variable_declaration(arg[i]);
}
if (!pure)
register_impure_function_call();
string funexpr;
funexpr += to_name(func) + "(";
for (uint32_t i = 0; i < length; i++)
{
funexpr += to_expression(arg[i]);
if (i + 1 < length)
funexpr += ", ";
}
funexpr += ")";
if (get<SPIRType>(result_type).basetype != SPIRType::Void)
{
// If the function actually writes to an out variable,
// take the conservative route and do not forward.
// The problem is that we might not read the function
// result (and emit the function) before an out variable
// is read (common case when return value is ignored!
// In order to avoid start tracking invalid variables,
// just avoid the forwarding problem altogether.
bool forward = args_will_forward(id, arg, length, pure) &&
!callee_has_out_variables && pure &&
(forced_temporaries.find(id) == end(forced_temporaries));
emit_op(result_type, id, funexpr, forward, false);
// Function calls are implicit loads from all variables in question.
// Set dependencies for them.
for (uint32_t i = 0; i < length; i++)
register_read(id, arg[i], forward);
// If we're going to forward the temporary result,
// put dependencies on every variable that must not change.
if (forward)
register_global_read_dependencies(callee, id);
}
else
statement(funexpr, ";");
break;
}
// Composite munging
case OpCompositeConstruct:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
const auto *elems = &ops[2];
length -= 2;
if (!length)
throw CompilerError("Invalid input to OpCompositeConstruct.");
bool forward = true;
for (uint32_t i = 0; i < length; i++)
forward = forward && should_forward(elems[i]);
auto &in_type = expression_type(elems[0]);
bool splat = in_type.vecsize == 1 && in_type.columns == 1;
if (splat)
{
uint32_t input = elems[0];
for (uint32_t i = 0; i < length; i++)
if (input != elems[i])
splat = false;
}
auto op = type_to_glsl_constructor(get<SPIRType>(result_type)) + "(";
if (splat)
op += to_expression(elems[0]);
else
op += build_composite_combiner(elems, length);
op += ")";
emit_op(result_type, id, op, forward, false);
break;
}
case OpVectorInsertDynamic:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t vec = ops[2];
uint32_t comp = ops[3];
uint32_t index = ops[4];
flush_variable_declaration(vec);
// Make a copy, then use access chain to store the variable.
statement(declare_temporary(result_type, id), to_expression(vec), ";");
set<SPIRExpression>(id, to_name(id), result_type, true);
auto chain = access_chain(id, &index, 1, false);
statement(chain, " = ", to_expression(comp), ";");
break;
}
case OpVectorExtractDynamic:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
auto expr = access_chain(ops[2], &ops[3], 1, false);
emit_op(result_type, id, expr, should_forward(ops[2]), false);
break;
}
case OpCompositeExtract:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
length -= 3;
auto &type = get<SPIRType>(result_type);
// Only apply this optimization if result is scalar.
if (should_forward(ops[2]) && type.vecsize == 1 && type.columns == 1 && length == 1)
{
// We want to split the access chain from the base.
// This is so we can later combine different CompositeExtract results
// with CompositeConstruct without emitting code like
//
// vec3 temp = texture(...).xyz
// vec4(temp.x, temp.y, temp.z, 1.0).
//
// when we actually wanted to emit this
// vec4(texture(...).xyz, 1.0).
//
// Including the base will prevent this and would trigger multiple reads
// from expression causing it to be forced to an actual temporary in GLSL.
auto expr = access_chain(ops[2], &ops[3], length, true, true);
auto &e = emit_op(result_type, id, expr, true, false,
!expression_is_forwarded(ops[2]));
e.base_expression = ops[2];
}
else
{
auto expr = access_chain(ops[2], &ops[3], length, true);
emit_op(result_type, id, expr, should_forward(ops[2]), false,
!expression_is_forwarded(ops[2]));
}
break;
}
case OpCompositeInsert:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t obj = ops[2];
uint32_t composite = ops[3];
const auto *elems = &ops[4];
length -= 4;
flush_variable_declaration(composite);
auto *expr = maybe_get<SPIRExpression>(id);
if ((expr && expr->used_while_invalidated) || !should_forward(composite))
{
// Make a copy, then use access chain to store the variable.
statement(declare_temporary(result_type, id), to_expression(composite), ";");
set<SPIRExpression>(id, to_name(id), result_type, true);
auto chain = access_chain(id, elems, length, true);
statement(chain, " = ", to_expression(obj), ";");
}
else
{
auto chain = access_chain(composite, elems, length, true);
statement(chain, " = ", to_expression(obj), ";");
set<SPIRExpression>(id, to_expression(composite), result_type, true);
register_write(composite);
register_read(id, composite, true);
// Invalidate the old expression we inserted into.
invalid_expressions.insert(composite);
}
break;
}
case OpCopyObject:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t rhs = ops[2];
if (expression_is_lvalue(rhs))
{
// Need a copy.
statement(declare_temporary(result_type, id), to_expression(rhs), ";");
set<SPIRExpression>(id, to_name(id), result_type, true);
}
else
{
// RHS expression is immutable, so just forward it.
// Copying these things really make no sense, but
// seems to be allowed anyways.
set<SPIRExpression>(id, to_expression(rhs), result_type, true);
}
break;
}
case OpVectorShuffle:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t vec0 = ops[2];
uint32_t vec1 = ops[3];
const auto *elems = &ops[4];
length -= 4;
auto &type0 = expression_type(vec0);
bool shuffle = false;
for (uint32_t i = 0; i < length; i++)
if (elems[i] >= type0.vecsize)
shuffle = true;
string expr;
bool trivial_forward;
if (shuffle)
{
trivial_forward = !expression_is_forwarded(vec0) && !expression_is_forwarded(vec1);
// Constructor style and shuffling from two different vectors.
vector<string> args;
for (uint32_t i = 0; i < length; i++)
{
if (elems[i] >= type0.vecsize)
args.push_back(join(to_expression(vec1), ".", index_to_swizzle(elems[i] - type0.vecsize)));
else
args.push_back(join(to_expression(vec0), ".", index_to_swizzle(elems[i])));
}
expr += join(type_to_glsl_constructor(get<SPIRType>(result_type)), "(", merge(args), ")");
}
else
{
trivial_forward = !expression_is_forwarded(vec0);
// We only source from first vector, so can use swizzle.
expr += to_expression(vec0);
expr += ".";
for (uint32_t i = 0; i < length; i++)
expr += index_to_swizzle(elems[i]);
if (backend.swizzle_is_function && length > 1)
expr += "()";
}
// A shuffle is trivial in that it doesn't actually *do* anything.
// We inherit the forwardedness from our arguments to avoid flushing out to temporaries when it's not really needed.
emit_op(result_type, id, expr, should_forward(vec0) && should_forward(vec1), false, trivial_forward);
break;
}
// ALU
case OpIsNan:
UFOP(isnan);
break;
case OpIsInf:
UFOP(isinf);
break;
case OpSNegate:
case OpFNegate:
UOP(-);
break;
case OpIAdd:
case OpFAdd:
BOP(+);
break;
case OpISub:
case OpFSub:
BOP(-);
break;
case OpIMul:
case OpFMul:
case OpMatrixTimesVector:
case OpMatrixTimesScalar:
case OpVectorTimesScalar:
case OpVectorTimesMatrix:
case OpMatrixTimesMatrix:
BOP(*);
break;
case OpOuterProduct:
UFOP(outerProduct);
break;
case OpDot:
BFOP(dot);
break;
case OpTranspose:
UFOP(transpose);
break;
case OpSDiv:
case OpUDiv:
case OpFDiv:
BOP(/);
break;
// Might need workaround if RightLocal can be used on signed types ...
case OpShiftRightLogical:
case OpShiftRightArithmetic:
BOP(>>);
break;
case OpShiftLeftLogical:
BOP(<<);
break;
case OpBitwiseOr:
BOP(|);
break;
case OpBitwiseXor:
BOP(^);
break;
case OpBitwiseAnd:
BOP(&);
break;
case OpNot:
UOP(~);
break;
case OpUMod:
case OpSMod:
case OpFMod:
BOP(%);
break;
// Relational
case OpAny:
UFOP(any);
break;
case OpAll:
UFOP(all);
break;
case OpSelect:
emit_mix_op(ops[0], ops[1], ops[4], ops[3], ops[2]);
break;
case OpLogicalOr:
BOP(||);
break;
case OpLogicalAnd:
BOP(&&);
break;
case OpLogicalNot:
UOP(!);
break;
case OpLogicalEqual:
case OpIEqual:
case OpFOrdEqual:
{
if (expression_type(ops[2]).vecsize > 1)
BFOP(equal);
else
BOP(==);
break;
}
case OpLogicalNotEqual:
case OpINotEqual:
case OpFOrdNotEqual:
{
if (expression_type(ops[2]).vecsize > 1)
BFOP(notEqual);
else
BOP(!=);
break;
}
case OpUGreaterThan:
case OpSGreaterThan:
case OpFOrdGreaterThan:
{
if (expression_type(ops[2]).vecsize > 1)
BFOP(greaterThan);
else
BOP(>);
break;
}
case OpUGreaterThanEqual:
case OpSGreaterThanEqual:
case OpFOrdGreaterThanEqual:
{
if (expression_type(ops[2]).vecsize > 1)
BFOP(greaterThanEqual);
else
BOP(>=);
break;
}
case OpULessThan:
case OpSLessThan:
case OpFOrdLessThan:
{
if (expression_type(ops[2]).vecsize > 1)
BFOP(lessThan);
else
BOP(<);
break;
}
case OpULessThanEqual:
case OpSLessThanEqual:
case OpFOrdLessThanEqual:
{
if (expression_type(ops[2]).vecsize > 1)
BFOP(lessThanEqual);
else
BOP(<=);
break;
}
// Conversion
case OpConvertFToU:
case OpConvertFToS:
case OpConvertSToF:
case OpConvertUToF:
case OpUConvert:
case OpSConvert:
case OpFConvert:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
auto func = type_to_glsl_constructor(get<SPIRType>(result_type));
emit_unary_func_op(result_type, id, ops[2], func.c_str());
break;
}
case OpBitcast:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t arg = ops[2];
auto op = bitcast_glsl_op(result_type, arg);
emit_unary_func_op(result_type, id, arg, op.c_str());
break;
}
// Derivatives
case OpDPdx:
UFOP(dFdx);
break;
case OpDPdy:
UFOP(dFdy);
break;
case OpFwidth:
UFOP(fwidth);
break;
// Bitfield
case OpBitFieldInsert:
QFOP(bitfieldInsert);
break;
case OpBitFieldSExtract:
case OpBitFieldUExtract:
QFOP(bitfieldExtract);
break;
case OpBitReverse:
UFOP(bitfieldReverse);
break;
case OpBitCount:
UFOP(bitCount);
break;
// Atomics
case OpAtomicExchange:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t ptr = ops[2];
// Ignore semantics for now, probably only relevant to CL.
uint32_t val = ops[5];
const char *op = check_atomic_image(ptr) ? "imageAtomicExchange" : "atomicExchange";
forced_temporaries.insert(id);
emit_binary_func_op(result_type, id, ptr, val, op);
flush_all_atomic_capable_variables();
break;
}
case OpAtomicCompareExchange:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t ptr = ops[2];
uint32_t val = ops[6];
uint32_t comp = ops[7];
const char *op = check_atomic_image(ptr) ? "imageAtomicCompSwap" : "atomicCompSwap";
forced_temporaries.insert(id);
emit_trinary_func_op(result_type, id, ptr, comp, val, op);
flush_all_atomic_capable_variables();
break;
}
case OpAtomicLoad:
flush_all_atomic_capable_variables();
// FIXME: Image?
UFOP(atomicCounter);
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
// OpAtomicStore unimplemented. Not sure what would use that.
// OpAtomicLoad seems to only be relevant for atomic counters.
case OpAtomicIIncrement:
forced_temporaries.insert(ops[1]);
// FIXME: Image?
UFOP(atomicCounterIncrement);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
case OpAtomicIDecrement:
forced_temporaries.insert(ops[1]);
// FIXME: Image?
UFOP(atomicCounterDecrement);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
case OpAtomicIAdd:
{
const char *op = check_atomic_image(ops[2]) ? "imageAtomicAdd" : "atomicAdd";
forced_temporaries.insert(ops[1]);
emit_binary_func_op(ops[0], ops[1], ops[2], ops[5], op);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
}
case OpAtomicISub:
{
const char *op = check_atomic_image(ops[2]) ? "imageAtomicAdd" : "atomicAdd";
forced_temporaries.insert(ops[1]);
auto expr = join(op, "(", to_expression(ops[2]), ", -", to_expression(ops[5]), ")");
emit_op(ops[0], ops[1], expr, should_forward(ops[2]) && should_forward(ops[5]), false);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
}
case OpAtomicSMin:
case OpAtomicUMin:
{
const char *op = check_atomic_image(ops[2]) ? "imageAtomicMin" : "atomicMin";
forced_temporaries.insert(ops[1]);
emit_binary_func_op(ops[0], ops[1], ops[2], ops[5], op);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
}
case OpAtomicSMax:
case OpAtomicUMax:
{
const char *op = check_atomic_image(ops[2]) ? "imageAtomicMax" : "atomicMax";
forced_temporaries.insert(ops[1]);
emit_binary_func_op(ops[0], ops[1], ops[2], ops[5], op);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
}
case OpAtomicAnd:
{
const char *op = check_atomic_image(ops[2]) ? "imageAtomicAnd" : "atomicAnd";
forced_temporaries.insert(ops[1]);
emit_binary_func_op(ops[0], ops[1], ops[2], ops[5], op);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
}
case OpAtomicOr:
{
const char *op = check_atomic_image(ops[2]) ? "imageAtomicOr" : "atomicOr";
forced_temporaries.insert(ops[1]);
emit_binary_func_op(ops[0], ops[1], ops[2], ops[5], op);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
}
case OpAtomicXor:
{
const char *op = check_atomic_image(ops[2]) ? "imageAtomicXor" : "atomicXor";
forced_temporaries.insert(ops[1]);
emit_binary_func_op(ops[0], ops[1], ops[2], ops[5], op);
flush_all_atomic_capable_variables();
register_read(ops[1], ops[2], should_forward(ops[2]));
break;
}
// Geometry shaders
case OpEmitVertex:
statement("EmitVertex();");
break;
case OpEndPrimitive:
statement("EndPrimitive();");
break;
case OpEmitStreamVertex:
statement("EmitStreamVertex();");
break;
case OpEndStreamPrimitive:
statement("EndStreamPrimitive();");
break;
// Textures
case OpImageSampleImplicitLod:
case OpImageSampleExplicitLod:
case OpImageSampleProjImplicitLod:
case OpImageSampleProjExplicitLod:
case OpImageSampleDrefImplicitLod:
case OpImageSampleDrefExplicitLod:
case OpImageSampleProjDrefImplicitLod:
case OpImageSampleProjDrefExplicitLod:
case OpImageFetch:
case OpImageGather:
case OpImageDrefGather:
// Gets a bit hairy, so move this to a separate instruction.
emit_texture_op(i);
break;
case OpImage:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
emit_op(result_type, id, to_expression(ops[2]), true, false);
break;
}
case OpImageQuerySizeLod:
BFOP(textureSize);
break;
// Image load/store
case OpImageRead:
{
// We added Nonreadable speculatively to the OpImage variable due to glslangValidator
// not adding the proper qualifiers.
// If it turns out we need to read the image after all, remove the qualifier and recompile.
auto *var = maybe_get_backing_variable(ops[2]);
if (var)
{
auto &flags = meta.at(var->self).decoration.decoration_flags;
if (flags & (1ull << DecorationNonReadable))
{
flags &= ~(1ull << DecorationNonReadable);
force_recompile = true;
}
}
uint32_t result_type = ops[0];
uint32_t id = ops[1];
bool pure;
string imgexpr;
auto &type = expression_type(ops[2]);
if (var && var->remapped_variable) // PLS input, just read as-is without any op-code
{
// PLS input could have different number of components than what the SPIR expects, swizzle to
// the appropriate vector size.
auto itr = find_if(begin(pls_inputs), end(pls_inputs),
[var](const PlsRemap &pls) { return pls.id == var->self; });
if (itr == end(pls_inputs))
throw CompilerError("Found PLS remap for OpImageRead, but ID is not a PLS input ...");
uint32_t components = pls_format_to_components(itr->format);
imgexpr = remap_swizzle(result_type, components, ops[2]);
pure = true;
}
else if (type.image.dim == DimSubpassData)
{
// Implement subpass loads via texture barrier style sampling.
// Fairly ugly, but should essentially work as a fallback for desktop.
imgexpr = join("texture(", to_expression(ops[2]),
", gl_FragCoord.xy / vec2(textureSize(", to_expression(ops[2]), ", 0).xy))");
pure = true;
}
else
{
// Plain image load/store.
imgexpr = join("imageLoad(", to_expression(ops[2]), ", ", to_expression(ops[3]), ")");
pure = false;
}
if (var && var->forwardable)
{
auto &e = emit_op(result_type, id, imgexpr, true, false);
// We only need to track dependencies if we're reading from image load/store.
if (!pure)
{
e.loaded_from = var->self;
var->dependees.push_back(id);
}
}
else
emit_op(result_type, id, imgexpr, false, false);
break;
}
case OpImageTexelPointer:
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
auto &e = set<SPIRExpression>(id, join(to_expression(ops[2]), ", ", to_expression(ops[3])), result_type, true);
auto *var = maybe_get_backing_variable(ops[2]);
e.loaded_from = var ? var->self : 0;
break;
}
case OpImageWrite:
{
// We added Nonwritable speculatively to the OpImage variable due to glslangValidator
// not adding the proper qualifiers.
// If it turns out we need to write to the image after all, remove the qualifier and recompile.
auto *var = maybe_get_backing_variable(ops[0]);
if (var)
{
auto &flags = meta.at(var->self).decoration.decoration_flags;
if (flags & (1ull << DecorationNonWritable))
{
flags &= ~(1ull << DecorationNonWritable);
force_recompile = true;
}
}
statement("imageStore(",
to_expression(ops[0]), ", ",
to_expression(ops[1]), ", ",
to_expression(ops[2]), ");");
if (var && variable_storage_is_aliased(*var))
flush_all_aliased_variables();
break;
}
case OpImageQuerySize:
{
auto &type = expression_type(ops[2]);
uint32_t result_type = ops[0];
uint32_t id = ops[1];
if (type.basetype == SPIRType::Image)
{
// The size of an image is always constant.
emit_op(result_type, id, join("imageSize(", to_expression(ops[2]), ")"),
true, false);
}
else
throw CompilerError("Invalid type for OpImageQuerySize.");
break;
}
// Compute
case OpControlBarrier:
{
// Ignore execution and memory scope.
if (execution.model == ExecutionModelGLCompute)
{
uint32_t mem = get<SPIRConstant>(ops[2]).scalar();
if (mem == MemorySemanticsWorkgroupMemoryMask)
statement("memoryBarrierShared();");
else if (mem && mem != 4062) // Hacky workaround of glslangValidator which emits "all" barrier for barrier() ...
statement("memoryBarrier();");
}
statement("barrier();");
break;
}
case OpMemoryBarrier:
{
uint32_t mem = get<SPIRConstant>(ops[1]).scalar();
// We cannot forward any loads beyond the memory barrier.
if (mem)
flush_all_active_variables();
if (mem == MemorySemanticsWorkgroupMemoryMask)
statement("memoryBarrierShared();");
else if (mem && mem != 4062) // Hacky workaround of glslangValidator which emits "all" barrier for barrier() ...
statement("memoryBarrier();");
break;
}
case OpExtInst:
{
uint32_t set = ops[2];
if (get<SPIRExtension>(set).ext != SPIRExtension::GLSL)
{
statement("// unimplemented ext op ", i.op);
break;
}
emit_glsl_op(ops[0], ops[1], ops[3], &ops[4], length - 4);
break;
}
default:
statement("// unimplemented op ", i.op);
break;
}
}
string CompilerGLSL::to_member_name(const SPIRType &type, uint32_t index)
{
auto &memb = meta[type.self].members;
if (index < memb.size() && !memb[index].alias.empty())
return memb[index].alias;
else
return join("_", index);
}
string CompilerGLSL::member_decl(const SPIRType &type, const SPIRType &membertype, uint32_t index)
{
uint64_t memberflags = 0;
auto &memb = meta[type.self].members;
if (index < memb.size())
memberflags = memb[index].decoration_flags;
return join(layout_for_member(type, index),
flags_to_precision_qualifiers_glsl(membertype, memberflags),
type_to_glsl(membertype), " ", to_member_name(type, index), type_to_array_glsl(membertype));
}
const char* CompilerGLSL::flags_to_precision_qualifiers_glsl(const SPIRType &type, uint64_t flags)
{
if (options.es)
{
// Structs to not have precision qualifiers.
if (type.basetype != SPIRType::Float &&
type.basetype != SPIRType::Int &&
type.basetype != SPIRType::UInt &&
type.basetype != SPIRType::Image &&
type.basetype != SPIRType::SampledImage)
return "";
if (flags & (1ull << DecorationRelaxedPrecision))
{
bool implied_fmediump = type.basetype == SPIRType::Float &&
options.fragment.default_float_precision == Options::Mediump &&
execution.model == ExecutionModelFragment;
bool implied_imediump = (type.basetype == SPIRType::Int || type.basetype == SPIRType::UInt) &&
options.fragment.default_int_precision == Options::Mediump &&
execution.model == ExecutionModelFragment;
return implied_fmediump || implied_imediump ? "" : "mediump ";
}
else
{
bool implied_fhighp = type.basetype == SPIRType::Float &&
((options.fragment.default_float_precision == Options::Highp &&
execution.model == ExecutionModelFragment) || (execution.model != ExecutionModelFragment));
bool implied_ihighp = (type.basetype == SPIRType::Int || type.basetype == SPIRType::UInt) &&
((options.fragment.default_int_precision == Options::Highp &&
execution.model == ExecutionModelFragment) || (execution.model != ExecutionModelFragment));
return implied_fhighp || implied_ihighp ? "" : "highp ";
}
}
else
return "";
}
const char* CompilerGLSL::to_precision_qualifiers_glsl(uint32_t id)
{
return flags_to_precision_qualifiers_glsl(expression_type(id), meta[id].decoration.decoration_flags);
}
string CompilerGLSL::to_qualifiers_glsl(uint32_t id)
{
auto flags = meta[id].decoration.decoration_flags;
string res;
auto *var = maybe_get<SPIRVariable>(id);
if (var && var->storage == StorageClassWorkgroup && !backend.shared_is_implied)
res += "shared ";
res += to_precision_qualifiers_glsl(id);
//if (flags & (1ull << DecorationSmooth))
// res += "smooth ";
if (flags & (1ull << DecorationFlat))
res += "flat ";
if (flags & (1ull << DecorationNoPerspective))
res += "noperspective ";
if (flags & (1ull << DecorationPatch))
res += "patch ";
if (flags & (1ull << DecorationSample))
res += "sample ";
if (flags & (1ull << DecorationInvariant))
res += "invariant ";
auto &type = expression_type(id);
if (type.image.dim != DimSubpassData)
{
if (flags & (1ull << DecorationNonWritable))
res += "readonly ";
if (flags & (1ull << DecorationNonReadable))
res += "writeonly ";
}
return res;
}
string CompilerGLSL::argument_decl(const SPIRFunction::Parameter &arg)
{
// glslangValidator seems to make all arguments pointer no matter what which is rather bizarre ...
// Not sure if argument being pointer type should make the argument inout.
auto &type = expression_type(arg.id);
const char *direction = "";
if (type.pointer)
{
if (arg.write_count && arg.read_count)
direction = "inout ";
else if (arg.write_count)
direction = "out ";
}
return join(direction, to_qualifiers_glsl(arg.id), type_to_glsl(type), " ",
to_name(arg.id), type_to_array_glsl(type));
}
string CompilerGLSL::variable_decl(const SPIRVariable &variable)
{
// Ignore the pointer type since GLSL doesn't have pointers.
auto &type = get<SPIRType>(variable.basetype);
auto res = join(to_qualifiers_glsl(variable.self), type_to_glsl(type), " ", to_name(variable.self), type_to_array_glsl(type));
if (variable.initializer)
res += join(" = ", to_expression(variable.initializer));
return res;
}
const char* CompilerGLSL::to_pls_qualifiers_glsl(const SPIRVariable &variable)
{
auto flags = meta[variable.self].decoration.decoration_flags;
if (flags & (1ull << DecorationRelaxedPrecision))
return "mediump ";
else
return "highp ";
}
string CompilerGLSL::pls_decl(const PlsRemap &var)
{
auto &variable = get<SPIRVariable>(var.id);
SPIRType type;
type.vecsize = pls_format_to_components(var.format);
type.basetype = pls_format_to_basetype(var.format);
return join(to_pls_layout(var.format), to_pls_qualifiers_glsl(variable), type_to_glsl(type), " ", to_name(variable.self));
}
string CompilerGLSL::type_to_array_glsl(const SPIRType &type)
{
string res;
for (auto &size : type.array)
{
res += "[";
if (size)
res += convert_to_string(size);
res += "]";
}
return res;
}
string CompilerGLSL::image_type_glsl(const SPIRType &type)
{
auto &imagetype = get<SPIRType>(type.image.type);
string res;
switch (imagetype.basetype)
{
case SPIRType::Int: res = "i"; break;
case SPIRType::UInt: res = "u"; break;
default: break;
}
// If we're emulating subpassInput with samplers, force sampler2D
// so we don't have to specify format.
res += type.basetype == SPIRType::Image && type.image.dim != DimSubpassData ?
"image" : "sampler";
switch (type.image.dim)
{
case Dim1D: res += "1D"; break;
case Dim2D: res += "2D"; break;
case Dim3D: res += "3D"; break;
case DimCube: res += "Cube"; break;
case DimBuffer:
if (options.es && options.version < 320)
require_extension("GL_OES_texture_buffer");
else if (!options.es && options.version < 300)
require_extension("GL_EXT_texture_buffer_object");
res += "Buffer";
break;
case DimSubpassData: res += "2D"; break;
default: throw CompilerError("Only 1D, 2D, 3D, Buffer, InputTarget and Cube textures supported.");
}
if (type.image.arrayed)
res += "Array";
if (type.image.depth)
res += "Shadow";
if (type.image.ms)
res += "MS";
return res;
}
string CompilerGLSL::type_to_glsl_constructor(const SPIRType &type)
{
auto e = type_to_glsl(type);
for (uint32_t i = 0; i < type.array.size(); i++)
e += "[]";
return e;
}
string CompilerGLSL::type_to_glsl(const SPIRType &type)
{
// Ignore the pointer type since GLSL doesn't have pointers.
switch (type.basetype)
{
case SPIRType::Struct:
// Need OpName lookup here to get a "sensible" name for a struct.
return to_name(type.self);
case SPIRType::Image:
case SPIRType::SampledImage:
return image_type_glsl(type);
case SPIRType::Sampler:
// Not really used.
return "sampler";
case SPIRType::Void:
return "void";
default:
break;
}
if (type.vecsize == 1 && type.columns == 1) // Scalar builtin
{
switch (type.basetype)
{
case SPIRType::Bool: return "bool";
case SPIRType::Int: return backend.basic_int_type;
case SPIRType::UInt: return backend.basic_uint_type;
case SPIRType::AtomicCounter: return "atomic_uint";
case SPIRType::Float: return "float";
default: return "???";
}
}
else if (type.vecsize > 1 && type.columns == 1) // Vector builtin
{
switch (type.basetype)
{
case SPIRType::Bool: return join("bvec", type.vecsize);
case SPIRType::Int: return join("ivec", type.vecsize);
case SPIRType::UInt: return join("uvec", type.vecsize);
case SPIRType::Float: return join("vec", type.vecsize);
default: return "???";
}
}
else if (type.vecsize == type.columns) // Simple Matrix builtin
{
switch (type.basetype)
{
case SPIRType::Bool: return join("bmat", type.vecsize);
case SPIRType::Int: return join("imat", type.vecsize);
case SPIRType::UInt: return join("umat", type.vecsize);
case SPIRType::Float: return join("mat", type.vecsize);
default: return "???";
}
}
else
{
switch (type.basetype)
{
case SPIRType::Bool: return join("bmat", type.columns, "x", type.vecsize);
case SPIRType::Int: return join("imat", type.columns, "x", type.vecsize);
case SPIRType::UInt: return join("umat", type.columns, "x", type.vecsize);
case SPIRType::Float: return join("mat", type.columns, "x", type.vecsize);
default: return "???";
}
}
}
void CompilerGLSL::add_local_variable(uint32_t id)
{
auto &name = meta[id].decoration.alias;
if (name.empty())
return;
// Reserved for temporaries.
if (name[0] == '_')
{
name.clear();
return;
}
update_name_cache(local_variables, name);
}
void CompilerGLSL::require_extension(const string &ext)
{
if (forced_extensions.find(ext) == end(forced_extensions))
{
forced_extensions.insert(ext);
force_recompile = true;
}
}
bool CompilerGLSL::check_atomic_image(uint32_t id)
{
auto &type = expression_type(id);
if (type.storage == StorageClassImage)
{
if (options.es && options.version < 320)
require_extension("GL_OES_shader_image_atomic");
auto *var = maybe_get_backing_variable(id);
if (var)
{
auto &flags = meta.at(var->self).decoration.decoration_flags;
if (flags & ((1ull << DecorationNonWritable) | (1ull << DecorationNonReadable)))
{
flags &= ~(1ull << DecorationNonWritable);
flags &= ~(1ull << DecorationNonReadable);
force_recompile = true;
}
}
return true;
}
else
return false;
}
void CompilerGLSL::emit_function_prototype(SPIRFunction &func, uint64_t return_flags)
{
local_variables.clear();
string decl;
auto &type = get<SPIRType>(func.return_type);
decl += flags_to_precision_qualifiers_glsl(type, return_flags);
decl += type_to_glsl(type);
decl += " ";
if (func.self == execution.entry_point)
{
decl += "main";
processing_entry_point = true;
}
else
decl += to_name(func.self);
decl += "(";
for (auto &arg : func.arguments)
{
// Might change the variable name if it already exists in this function.
// SPIRV OpName doesn't have any semantic effect, so it's valid for an implementation
// to use same name for variables.
// Since we want to make the GLSL debuggable and somewhat sane, use fallback names for variables which are duplicates.
add_local_variable(arg.id);
decl += argument_decl(arg);
if (&arg != &func.arguments.back())
decl += ", ";
// Hold a pointer to the parameter so we can invalidate the readonly field if needed.
auto *var = maybe_get<SPIRVariable>(arg.id);
if (var)
var->parameter = &arg;
}
decl += ")";
statement(decl);
}
void CompilerGLSL::emit_function(SPIRFunction &func, uint64_t return_flags)
{
// Avoid potential cycles.
if (func.active)
return;
func.active = true;
// If we depend on a function, emit that function before we emit our own function.
for (auto block : func.blocks)
{
auto &b = get<SPIRBlock>(block);
for (auto &i : b.ops)
{
auto ops = stream(i.offset);
auto op = static_cast<Op>(i.op);
if (op == OpFunctionCall)
{
// Recursively emit functions which are called.
uint32_t func = ops[2];
emit_function(get<SPIRFunction>(func), meta[ops[1]].decoration.decoration_flags);
}
}
}
emit_function_prototype(func, return_flags);
begin_scope();
function = &func;
for (auto &v : func.local_variables)
{
auto &var = get<SPIRVariable>(v);
if (expression_is_lvalue(v))
{
add_local_variable(var.self);
if (var.initializer)
statement(variable_decl(var), ";");
else
{
// Don't declare variable until first use to declutter the GLSL output quite a lot.
// If we don't touch the variable before first branch,
// declare it then since we need variable declaration to be in top scope.
var.deferred_declaration = true;
}
}
else
{
// HACK: SPIRV likes to use samplers and images as local variables, but GLSL does not allow
// this. For these types (non-lvalue), we enforce forwarding through a shadowed variable.
// This means that when we OpStore to these variables, we just write in the expression ID directly.
// This breaks any kind of branching, since the variable must be statically assigned.
// Branching on samplers and images would be pretty much impossible to fake in GLSL.
var.statically_assigned = true;
}
}
auto &entry_block = get<SPIRBlock>(func.entry_block);
entry_block.loop_dominator = SPIRBlock::NoDominator;
emit_block_chain(entry_block);
end_scope();
processing_entry_point = false;
statement("");
}
void CompilerGLSL::emit_fixup()
{
if (execution.model == ExecutionModelVertex && options.vertex.fixup_clipspace)
{
const char *suffix = backend.float_literal_suffix ? "f" : "";
statement("gl_Position.z = 2.0", suffix, " * gl_Position.z - gl_Position.w;");
}
}
bool CompilerGLSL::flush_phi_required(uint32_t from, uint32_t to)
{
auto &child = get<SPIRBlock>(to);
for (auto &phi : child.phi_variables)
if (phi.parent == from)
return true;
return false;
}
void CompilerGLSL::flush_phi(uint32_t from, uint32_t to)
{
auto &child = get<SPIRBlock>(to);
for (auto &phi : child.phi_variables)
if (phi.parent == from)
statement(to_expression(phi.function_variable), " = ", to_expression(phi.local_variable), ";");
}
void CompilerGLSL::branch(uint32_t from, uint32_t to)
{
flush_phi(from, to);
flush_all_active_variables();
// This is only a continue if we branch to our loop dominator.
if (loop_block.find(to) != end(loop_block) &&
get<SPIRBlock>(from).loop_dominator == to)
{
// This can happen if we had a complex continue block which was emitted.
// Once the continue block tries to branch to the loop header, just emit continue;
// and end the chain here.
statement("continue;");
}
else if (is_continue(to))
{
auto &continue_block = get<SPIRBlock>(to);
if (continue_block.complex_continue)
{
// Just emit the whole block chain as is.
auto usage_counts = expression_usage_counts;
auto invalid = invalid_expressions;
emit_block_chain(continue_block);
// Expression usage counts and invalid expressions
// are moot after returning from the continue block.
// Since we emit the same block multiple times,
// we don't want to invalidate ourselves.
expression_usage_counts = usage_counts;
invalid_expressions = invalid;
}
else
{
auto &block = get<SPIRBlock>(from);
auto &dominator = get<SPIRBlock>(block.loop_dominator);
// For non-complex continue blocks, we implicitly branch to the continue block
// by having the continue block be part of the loop header in for (; ; continue-block).
bool outside_control_flow = block_is_outside_flow_control_from_block(dominator, block);
// Some simplification for for-loops. We always end up with a useless continue;
// statement since we branch to a loop block.
// Walk the CFG, if we uncoditionally execute the block calling continue assuming we're in the loop block,
// we can avoid writing out an explicit continue statement.
// Similar optimization to return statements if we know we're outside flow control.
if (!outside_control_flow)
statement("continue;");
}
}
else if (is_break(to))
statement("break;");
else if (!is_conditional(to))
emit_block_chain(get<SPIRBlock>(to));
}
void CompilerGLSL::branch(uint32_t from, uint32_t cond, uint32_t true_block, uint32_t false_block)
{
// If we branch directly to a selection merge target, we don't really need a code path.
bool true_sub = !is_conditional(true_block);
bool false_sub = !is_conditional(false_block);
if (true_sub)
{
statement("if (", to_expression(cond), ")");
begin_scope();
branch(from, true_block);
end_scope();
if (false_sub)
{
statement("else");
begin_scope();
branch(from, false_block);
end_scope();
}
else if (flush_phi_required(from, false_block))
{
statement("else");
begin_scope();
flush_phi(from, false_block);
end_scope();
}
}
else if (false_sub && !true_sub)
{
// Only need false path, use negative conditional.
statement("if (!", to_expression(cond), ")");
begin_scope();
branch(from, false_block);
end_scope();
if (flush_phi_required(from, true_block))
{
statement("else");
begin_scope();
flush_phi(from, true_block);
end_scope();
}
}
}
void CompilerGLSL::propagate_loop_dominators(const SPIRBlock &block)
{
// Propagate down the loop dominator block, so that dominated blocks can back trace.
if (block.merge == SPIRBlock::MergeLoop || block.loop_dominator)
{
uint32_t dominator = block.merge == SPIRBlock::MergeLoop ?
block.self : block.loop_dominator;
auto set_dominator = [this](uint32_t self, uint32_t dominator) {
auto &block = this->get<SPIRBlock>(self);
// If we already have a loop dominator, we're trying to break out to merge targets
// which should not update the loop dominator.
if (!block.loop_dominator)
block.loop_dominator = dominator;
};
// After merging a loop, we inherit the loop dominator always.
if (block.merge_block)
set_dominator(block.merge_block, block.loop_dominator);
if (block.true_block)
set_dominator(block.true_block, dominator);
if (block.false_block)
set_dominator(block.false_block, dominator);
if (block.next_block)
set_dominator(block.next_block, dominator);
for (auto &c : block.cases)
set_dominator(c.block, dominator);
// In older glslang output continue_block can be == loop header.
if (block.continue_block && block.continue_block != block.self)
set_dominator(block.continue_block, dominator);
}
}
// FIXME: This currently cannot handle complex continue blocks
// as in do-while.
// This should be seen as a "trivial" continue block.
string CompilerGLSL::emit_continue_block(uint32_t continue_block)
{
auto *block = &get<SPIRBlock>(continue_block);
// While emitting the continue block, declare_temporary will check this
// if we have to emit temporaries.
current_continue_block = block;
vector<string> statements;
// Capture all statements into our list.
auto *old = redirect_statement;
redirect_statement = &statements;
// Stamp out all blocks one after each other.
while (loop_block.find(block->self) == end(loop_block))
{
propagate_loop_dominators(*block);
// Write out all instructions we have in this block.
for (auto &op : block->ops)
emit_instruction(op);
// For plain branchless for/while continue blocks.
if (block->next_block)
{
flush_phi(continue_block, block->next_block);
block = &get<SPIRBlock>(block->next_block);
}
// For do while blocks. The last block will be a select block.
else if (block->true_block)
{
flush_phi(continue_block, block->true_block);
block = &get<SPIRBlock>(block->true_block);
}
}
// Restore old pointer.
redirect_statement = old;
// Somewhat ugly, strip off the last ';' since we use ',' instead.
// Ideally, we should select this behavior in statement().
for (auto &statement : statements)
{
if (!statement.empty() && statement.back() == ';')
statement.pop_back();
}
current_continue_block = nullptr;
return merge(statements);
}
bool CompilerGLSL::attempt_emit_loop_header(SPIRBlock &block, SPIRBlock::Method method)
{
SPIRBlock::ContinueBlockType continue_type = continue_block_type(get<SPIRBlock>(block.continue_block));
if (method == SPIRBlock::MergeToSelectForLoop)
{
uint32_t current_count = statement_count;
// If we're trying to create a true for loop,
// we need to make sure that all opcodes before branch statement do not actually emit any code.
// We can then take the condition expression and create a for (; cond ; ) { body; } structure instead.
for (auto &op : block.ops)
emit_instruction(op);
bool condition_is_temporary = forced_temporaries.find(block.condition) == end(forced_temporaries);
// This can work! We only did trivial things which could be forwarded in block body!
if (current_count == statement_count && condition_is_temporary)
{
switch (continue_type)
{
case SPIRBlock::ForLoop:
statement("for (; ", to_expression(block.condition), "; ",
emit_continue_block(block.continue_block), ")");
break;
case SPIRBlock::WhileLoop:
statement("while (", to_expression(block.condition), ")");
break;
default:
throw CompilerError("For/while loop detected, but need while/for loop semantics.");
}
begin_scope();
return true;
}
else
{
block.disable_block_optimization = true;
force_recompile = true;
begin_scope(); // We'll see an end_scope() later.
return false;
}
}
else if (method == SPIRBlock::MergeToDirectForLoop)
{
uint32_t current_count = statement_count;
auto &child = get<SPIRBlock>(block.next_block);
// If we're trying to create a true for loop,
// we need to make sure that all opcodes before branch statement do not actually emit any code.
// We can then take the condition expression and create a for (; cond ; ) { body; } structure instead.
for (auto &op : child.ops)
emit_instruction(op);
bool condition_is_temporary = forced_temporaries.find(child.condition) == end(forced_temporaries);
if (current_count == statement_count && condition_is_temporary)
{
propagate_loop_dominators(child);
switch (continue_type)
{
case SPIRBlock::ForLoop:
statement("for (; ", to_expression(child.condition), "; ",
emit_continue_block(block.continue_block), ")");
break;
case SPIRBlock::WhileLoop:
statement("while (", to_expression(child.condition), ")");
break;
default:
throw CompilerError("For/while loop detected, but need while/for loop semantics.");
}
begin_scope();
branch(child.self, child.true_block);
return true;
}
else
{
block.disable_block_optimization = true;
force_recompile = true;
begin_scope(); // We'll see an end_scope() later.
return false;
}
}
else
return false;
}
void CompilerGLSL::flush_undeclared_variables()
{
// Declare undeclared variables.
if (function->flush_undeclared)
{
for (auto &v : function->local_variables)
{
auto &var = get<SPIRVariable>(v);
if (var.deferred_declaration)
statement(variable_decl(var), ";");
var.deferred_declaration = false;
}
function->flush_undeclared = false;
}
}
void CompilerGLSL::emit_block_chain(SPIRBlock &block)
{
propagate_loop_dominators(block);
bool select_branch_to_true_block = false;
bool skip_direct_branch = false;
// If we need to force temporaries for certain IDs due to continue blocks, do it before starting loop header.
for (auto &tmp : block.declare_temporary)
{
auto flags = meta[tmp.second].decoration.decoration_flags;
auto &type = get<SPIRType>(tmp.first);
statement(flags_to_precision_qualifiers_glsl(type, flags),
type_to_glsl(type), " ", to_name(tmp.second), type_to_array_glsl(type), ";");
}
SPIRBlock::ContinueBlockType continue_type = SPIRBlock::ContinueNone;
if (block.continue_block)
continue_type = continue_block_type(get<SPIRBlock>(block.continue_block));
// This is the older loop behavior in glslang which branches to loop body directly from the loop header.
if (block_is_loop_candidate(block, SPIRBlock::MergeToSelectForLoop))
{
flush_undeclared_variables();
if (attempt_emit_loop_header(block, SPIRBlock::MergeToSelectForLoop))
{
// The body of while, is actually just the true block, so always branch there
// unconditionally.
select_branch_to_true_block = true;
}
}
// This is the newer loop behavior in glslang which branches from Loop header directly to
// a new block, which in turn has a OpBranchSelection without a selection merge.
else if (block_is_loop_candidate(block, SPIRBlock::MergeToDirectForLoop))
{
flush_undeclared_variables();
if (attempt_emit_loop_header(block, SPIRBlock::MergeToDirectForLoop))
skip_direct_branch = true;
}
else if (continue_type == SPIRBlock::DoWhileLoop)
{
statement("do");
begin_scope();
for (auto &op : block.ops)
emit_instruction(op);
}
else if (block.merge == SPIRBlock::MergeLoop)
{
flush_undeclared_variables();
// We have a generic loop without any distinguishable pattern like for, while or do while.
get<SPIRBlock>(block.continue_block).complex_continue = true;
continue_type = SPIRBlock::ComplexLoop;
statement("for (;;)");
begin_scope();
for (auto &op : block.ops)
emit_instruction(op);
}
else
{
for (auto &op : block.ops)
emit_instruction(op);
}
bool emit_next_block = true;
// Handle end of block.
switch (block.terminator)
{
case SPIRBlock::Direct:
// True when emitting complex continue block.
if (block.loop_dominator == block.next_block)
{
branch(block.self, block.next_block);
emit_next_block = false;
}
// True if MergeToDirectForLoop succeeded.
else if (skip_direct_branch)
emit_next_block = false;
else if (is_continue(block.next_block) ||
is_break(block.next_block) ||
is_conditional(block.next_block))
{
branch(block.self, block.next_block);
emit_next_block = false;
}
break;
case SPIRBlock::Select:
// True if MergeToSelectForLoop succeeded.
if (select_branch_to_true_block)
branch(block.self, block.true_block);
else
{
flush_undeclared_variables();
branch(block.self, block.condition, block.true_block, block.false_block);
}
break;
case SPIRBlock::MultiSelect:
{
flush_undeclared_variables();
auto &type = expression_type(block.condition);
bool uint32_t_case = type.basetype == SPIRType::UInt;
statement("switch (", to_expression(block.condition), ")");
begin_scope();
for (auto &c : block.cases)
{
auto case_value = uint32_t_case ? convert_to_string(uint32_t(c.value)) : convert_to_string(int32_t(c.value));
statement("case ", case_value, ":");
begin_scope();
branch(block.self, c.block);
end_scope();
}
if (block.default_block != block.next_block)
{
statement("default:");
begin_scope();
if (is_break(block.default_block))
throw CompilerError("Cannot break; out of a switch statement and out of a loop at the same time ...");
branch(block.self, block.default_block);
end_scope();
}
else if (flush_phi_required(block.self, block.next_block))
{
statement("default:");
begin_scope();
flush_phi(block.self, block.next_block);
statement("break;");
end_scope();
}
end_scope();
break;
}
case SPIRBlock::Return:
if (processing_entry_point)
emit_fixup();
if (block.return_value)
{
// OpReturnValue can return Undef, so don't emit anything for this case.
if (ids.at(block.return_value).get_type() != TypeUndef)
statement("return ", to_expression(block.return_value), ";");
}
// If this block is the very final block and not called from control flow,
// we do not need an explicit return which looks out of place. Just end the function here.
// In the very weird case of for(;;) { return; } executing return is unconditional,
// but we actually need a return here ...
else if (!block_is_outside_flow_control_from_block(get<SPIRBlock>(function->entry_block), block) ||
block.loop_dominator != SPIRBlock::NoDominator)
statement("return;");
break;
case SPIRBlock::Kill:
statement("discard;");
break;
default:
throw CompilerError("Unimplemented block terminator.");
}
if (block.next_block && emit_next_block)
{
// If we hit this case, we're dealing with an unconditional branch, which means we will output
// that block after this. If we had selection merge, we already flushed phi variables.
if (block.merge != SPIRBlock::MergeSelection)
flush_phi(block.self, block.next_block);
emit_block_chain(get<SPIRBlock>(block.next_block));
}
if (block.merge == SPIRBlock::MergeLoop)
{
if (continue_type == SPIRBlock::DoWhileLoop)
{
// Make sure that we run the continue block to get the expressions set, but this
// should become an empty string.
// We have no fallbacks if we cannot forward everything to temporaries ...
auto statements = emit_continue_block(block.continue_block);
if (!statements.empty())
{
// The DoWhile block has side effects, force ComplexLoop pattern next pass.
get<SPIRBlock>(block.continue_block).complex_continue = true;
force_recompile = true;
}
end_scope_decl(join("while (", to_expression(get<SPIRBlock>(block.continue_block).condition), ")"));
}
else
end_scope();
flush_phi(block.self, block.merge_block);
emit_block_chain(get<SPIRBlock>(block.merge_block));
}
}
void CompilerGLSL::begin_scope()
{
statement("{");
indent++;
}
void CompilerGLSL::end_scope()
{
if (!indent)
throw CompilerError("Popping empty indent stack.");
indent--;
statement("}");
}
void CompilerGLSL::end_scope_decl()
{
if (!indent)
throw CompilerError("Popping empty indent stack.");
indent--;
statement("};");
}
void CompilerGLSL::end_scope_decl(const string &decl)
{
if (!indent)
throw CompilerError("Popping empty indent stack.");
indent--;
statement("} ", decl, ";");
}
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