SPIRV-Cross/spirv_msl.hpp
2017-01-26 10:19:26 +01:00

214 lines
8.7 KiB
C++

/*
* Copyright 2015-2016 The Brenwill Workshop Ltd.
*
* 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.
*/
#ifndef SPIRV_CROSS_MSL_HPP
#define SPIRV_CROSS_MSL_HPP
#include "spirv_glsl.hpp"
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <vector>
namespace spirv_cross
{
// Options for compiling to Metal Shading Language
struct MSLConfiguration
{
bool flip_vert_y = false;
bool flip_frag_y = false;
bool is_rendering_points = false;
std::string entry_point_name;
};
// Defines MSL characteristics of a vertex attribute at a particular location.
// The used_by_shader flag is set to true during compilation of SPIR-V to MSL
// if the shader makes use of this vertex attribute.
struct MSLVertexAttr
{
uint32_t location = 0;
bool used_by_shader = false;
};
// Matches the binding index of a MSL resource for a binding within a descriptor set.
// Taken together, the stage, desc_set and binding combine to form a reference to a resource
// descriptor used in a particular shading stage. Generally, only one of the buffer, texture,
// or sampler elements will be populated. The used_by_shader flag is set to true during
// compilation of SPIR-V to MSL if the shader makes use of this vertex attribute.
struct MSLResourceBinding
{
spv::ExecutionModel stage;
uint32_t desc_set = 0;
uint32_t binding = 0;
uint32_t msl_buffer = 0;
uint32_t msl_texture = 0;
uint32_t msl_sampler = 0;
bool used_by_shader = false;
};
// Special constant used in a MSLResourceBinding desc_set
// element to indicate the bindings for the push constants.
static const uint32_t kPushConstDescSet = UINT32_MAX;
// Special constant used in a MSLResourceBinding binding
// element to indicate the bindings for the push constants.
static const uint32_t kPushConstBinding = 0;
// Decompiles SPIR-V to Metal Shading Language
class CompilerMSL : public CompilerGLSL
{
public:
// Constructs an instance to compile the SPIR-V code into Metal Shading Language.
CompilerMSL(std::vector<uint32_t> spirv);
// Compiles the SPIR-V code into Metal Shading Language using the specified configuration parameters.
// - msl_cfg indicates some general configuration for directing the compilation.
// - p_vtx_attrs is an optional list of vertex attribute bindings used to match
// vertex content locations to MSL attributes. If vertex attributes are provided,
// the compiler will set the used_by_shader flag to true in any vertex attribute
// actually used by the MSL code.
// - p_res_bindings is a list of resource bindings to indicate the MSL buffer,
// texture or sampler index to use for a particular SPIR-V description set
// and binding. If resource bindings are provided, the compiler will set the
// used_by_shader flag to true in any resource binding actually used by the MSL code.
std::string compile(MSLConfiguration &msl_cfg, std::vector<MSLVertexAttr> *p_vtx_attrs = nullptr,
std::vector<MSLResourceBinding> *p_res_bindings = nullptr);
// Compiles the SPIR-V code into Metal Shading Language using default configuration parameters.
std::string compile() override;
protected:
void emit_instruction(const Instruction &instr) override;
void emit_glsl_op(uint32_t result_type, uint32_t result_id, uint32_t op, const uint32_t *args,
uint32_t count) override;
void emit_header() override;
void emit_function_prototype(SPIRFunction &func, uint64_t return_flags) override;
void emit_sampled_image_op(uint32_t result_type, uint32_t result_id, uint32_t image_id, uint32_t samp_id) override;
void emit_fixup() override;
std::string type_to_glsl(const SPIRType &type) override;
std::string image_type_glsl(const SPIRType &type) override;
std::string builtin_to_glsl(spv::BuiltIn builtin) override;
std::string member_decl(const SPIRType &type, const SPIRType &member_type, uint32_t member) override;
std::string constant_expression(const SPIRConstant &c) override;
size_t get_declared_struct_member_size(const SPIRType &struct_type, uint32_t index) const override;
std::string to_func_call_arg(uint32_t id) override;
std::string to_name(uint32_t id, bool allow_alias = true) override;
std::string to_function_name(uint32_t img, const SPIRType &imgtype, bool is_fetch, bool is_gather, bool is_proj,
bool has_array_offsets, bool has_offset, bool has_grad, bool has_lod,
bool has_dref) override;
std::string to_function_args(uint32_t img, const SPIRType &imgtype, bool is_fetch, bool is_gather, bool is_proj,
uint32_t coord, uint32_t coord_components, uint32_t dref, uint32_t grad_x,
uint32_t grad_y, uint32_t lod, uint32_t coffset, uint32_t offset, uint32_t bias,
uint32_t comp, uint32_t sample, bool *p_forward) override;
void preprocess_op_codes();
void emit_custom_functions();
void localize_global_variables();
void extract_global_variables_from_functions();
std::unordered_map<uint32_t, std::unordered_set<uint32_t>> function_global_vars;
void extract_global_variables_from_function(uint32_t func_id, std::unordered_set<uint32_t> &added_arg_ids,
std::unordered_set<uint32_t> &global_var_ids,
std::unordered_set<uint32_t> &processed_func_ids);
uint32_t add_interface_block(spv::StorageClass storage);
void mark_location_as_used_by_shader(uint32_t location, spv::StorageClass storage);
void emit_resources();
void emit_interface_block(uint32_t ib_var_id);
void populate_func_name_overrides();
void populate_var_name_overrides();
std::string func_type_decl(SPIRType &type);
std::string clean_func_name(std::string func_name) override;
std::string entry_point_args(bool append_comma);
std::string get_entry_point_name();
std::string to_qualified_member_name(const SPIRType &type, uint32_t index);
std::string ensure_valid_name(std::string name, std::string pfx);
std::string to_sampler_expression(uint32_t id);
std::string builtin_qualifier(spv::BuiltIn builtin);
std::string builtin_type_decl(spv::BuiltIn builtin);
std::string member_attribute_qualifier(const SPIRType &type, uint32_t index);
std::string argument_decl(const SPIRFunction::Parameter &arg);
uint32_t get_metal_resource_index(SPIRVariable &var, SPIRType::BaseType basetype);
uint32_t get_ordered_member_location(uint32_t type_id, uint32_t index);
size_t get_declared_type_size(uint32_t type_id) const;
size_t get_declared_type_size(uint32_t type_id, uint64_t dec_mask) const;
std::string to_component_argument(uint32_t id);
MSLConfiguration msl_config;
std::unordered_map<std::string, std::string> func_name_overrides;
std::unordered_map<std::string, std::string> var_name_overrides;
std::set<uint32_t> custom_function_ops;
std::unordered_map<uint32_t, MSLVertexAttr *> vtx_attrs_by_location;
std::vector<MSLResourceBinding *> resource_bindings;
MSLResourceBinding next_metal_resource_index;
uint32_t stage_in_var_id = 0;
uint32_t stage_out_var_id = 0;
uint32_t stage_uniforms_var_id = 0;
std::string qual_pos_var_name;
std::string stage_in_var_name = "in";
std::string stage_out_var_name = "out";
std::string stage_uniform_var_name = "uniforms";
std::string sampler_name_suffix = "Smplr";
// OpcodeHandler that handles several MSL preprocessing operations.
struct OpCodePreprocessor : OpcodeHandler
{
OpCodePreprocessor(CompilerMSL &compiler_)
: compiler(compiler_)
{
}
bool handle(spv::Op opcode, const uint32_t *args, uint32_t length) override;
CompilerMSL &compiler;
bool suppress_missing_prototypes = false;
};
// Sorts the members of a SPIRType and associated Meta info based on a settable sorting
// aspect, which defines which aspect of the struct members will be used to sort them.
// Regardless of the sorting aspect, built-in members always appear at the end of the struct.
struct MemberSorter
{
enum SortAspect
{
Location,
LocationReverse,
Offset,
OffsetThenLocationReverse,
Alphabetical
};
void sort();
bool operator()(uint32_t mbr_idx1, uint32_t mbr_idx2);
MemberSorter(SPIRType &t, Meta &m, SortAspect sa)
: type(t)
, meta(m)
, sort_aspect(sa)
{
}
SPIRType &type;
Meta &meta;
SortAspect sort_aspect;
};
};
}
#endif