SPIRV-Cross/spirv_glsl.hpp
2016-12-06 23:03:35 +01:00

389 lines
14 KiB
C++

/*
* 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.
*/
#ifndef SPIRV_CROSS_GLSL_HPP
#define SPIRV_CROSS_GLSL_HPP
#include "spirv_cross.hpp"
#include <sstream>
#include <unordered_map>
#include <unordered_set>
#include <utility>
namespace spirv_cross
{
enum PlsFormat
{
PlsNone = 0,
PlsR11FG11FB10F,
PlsR32F,
PlsRG16F,
PlsRGB10A2,
PlsRGBA8,
PlsRG16,
PlsRGBA8I,
PlsRG16I,
PlsRGB10A2UI,
PlsRGBA8UI,
PlsRG16UI,
PlsR32UI
};
struct PlsRemap
{
uint32_t id;
PlsFormat format;
};
class CompilerGLSL : public Compiler
{
public:
struct Options
{
uint32_t version = 450;
bool es = false;
bool force_temporary = false;
// If true, variables will be moved to their appropriate scope through CFG analysis.
bool cfg_analysis = true;
// If true, Vulkan GLSL features are used instead of GL-compatible features.
// Mostly useful for debugging SPIR-V files.
bool vulkan_semantics = false;
enum Precision
{
DontCare,
Lowp,
Mediump,
Highp
};
struct
{
// In vertex shaders, rewrite [0, w] depth (Vulkan/D3D style) to [-w, w] depth (GL style).
bool fixup_clipspace = true;
} vertex;
struct
{
// Add precision mediump float in ES targets when emitting GLES source.
// Add precision highp int in ES targets when emitting GLES source.
Precision default_float_precision = Mediump;
Precision default_int_precision = Highp;
} fragment;
};
void remap_pixel_local_storage(std::vector<PlsRemap> inputs, std::vector<PlsRemap> outputs)
{
pls_inputs = std::move(inputs);
pls_outputs = std::move(outputs);
remap_pls_variables();
}
CompilerGLSL(std::vector<uint32_t> spirv_)
: Compiler(move(spirv_))
{
if (source.known)
{
options.es = source.es;
options.version = source.version;
}
}
const Options &get_options() const
{
return options;
}
void set_options(Options &opts)
{
options = opts;
}
std::string compile() override;
// Returns the current string held in the conversion buffer. Useful for
// capturing what has been converted so far when compile() throws an error.
std::string get_partial_source();
// Adds a line to be added right after #version in GLSL backend.
// This is useful for enabling custom extensions which are outside the scope of SPIRV-Cross.
// This can be combined with variable remapping.
// A new-line will be added.
//
// While add_header_line() is a more generic way of adding arbitrary text to the header
// of a GLSL file, require_extension() should be used when adding extensions since it will
// avoid creating collisions with SPIRV-Cross generated extensions.
//
// Code added via add_header_line() is typically backend-specific.
void add_header_line(const std::string &str);
// Adds an extension which is required to run this shader, e.g.
// require_extension("GL_KHR_my_extension");
void require_extension(const std::string &ext);
protected:
void reset();
void emit_function(SPIRFunction &func, uint64_t return_flags);
// Virtualize methods which need to be overridden by subclass targets like C++ and such.
virtual void emit_function_prototype(SPIRFunction &func, uint64_t return_flags);
virtual void emit_instruction(const Instruction &instr);
virtual void emit_glsl_op(uint32_t result_type, uint32_t result_id, uint32_t op, const uint32_t *args,
uint32_t count);
virtual void emit_header();
virtual void emit_sampled_image_op(uint32_t result_type, uint32_t result_id, uint32_t image_id, uint32_t samp_id);
virtual void emit_texture_op(const Instruction &i);
virtual std::string type_to_glsl(const SPIRType &type);
virtual std::string builtin_to_glsl(spv::BuiltIn builtin);
virtual std::string member_decl(const SPIRType &type, const SPIRType &member_type, uint32_t member);
virtual std::string image_type_glsl(const SPIRType &type);
virtual std::string constant_expression(const SPIRConstant &c);
std::string constant_op_expression(const SPIRConstantOp &cop);
virtual std::string constant_expression_vector(const SPIRConstant &c, uint32_t vector);
virtual void emit_fixup();
virtual std::string variable_decl(const SPIRType &type, const std::string &name);
virtual std::string to_func_call_arg(uint32_t id);
std::unique_ptr<std::ostringstream> buffer;
template <typename T>
inline void statement_inner(T &&t)
{
(*buffer) << std::forward<T>(t);
statement_count++;
}
template <typename T, typename... Ts>
inline void statement_inner(T &&t, Ts &&... ts)
{
(*buffer) << std::forward<T>(t);
statement_count++;
statement_inner(std::forward<Ts>(ts)...);
}
template <typename... Ts>
inline void statement(Ts &&... ts)
{
if (redirect_statement)
redirect_statement->push_back(join(std::forward<Ts>(ts)...));
else
{
for (uint32_t i = 0; i < indent; i++)
(*buffer) << " ";
statement_inner(std::forward<Ts>(ts)...);
(*buffer) << '\n';
}
}
template <typename... Ts>
inline void statement_no_indent(Ts &&... ts)
{
auto old_indent = indent;
indent = 0;
statement(std::forward<Ts>(ts)...);
indent = old_indent;
}
// Used for implementing continue blocks where
// we want to obtain a list of statements we can merge
// on a single line separated by comma.
std::vector<std::string> *redirect_statement = nullptr;
const SPIRBlock *current_continue_block = nullptr;
void begin_scope();
void end_scope();
void end_scope_decl();
void end_scope_decl(const std::string &decl);
Options options;
std::string type_to_array_glsl(const SPIRType &type);
std::string to_array_size(const SPIRType &type, uint32_t index);
uint32_t to_array_size_literal(const SPIRType &type, uint32_t index) const;
std::string variable_decl(const SPIRVariable &variable);
void add_local_variable_name(uint32_t id);
void add_resource_name(uint32_t id);
void add_member_name(SPIRType &type, uint32_t name);
std::unordered_set<std::string> local_variable_names;
std::unordered_set<std::string> resource_names;
bool processing_entry_point = false;
// Can be overriden by subclass backends for trivial things which
// shouldn't need polymorphism.
struct BackendVariations
{
std::string discard_literal = "discard";
bool float_literal_suffix = false;
bool double_literal_suffix = true;
bool uint32_t_literal_suffix = true;
bool long_long_literal_suffix = false;
const char *basic_int_type = "int";
const char *basic_uint_type = "uint";
bool swizzle_is_function = false;
bool shared_is_implied = false;
bool flexible_member_array_supported = true;
bool explicit_struct_type = false;
bool use_initializer_list = false;
} backend;
void emit_struct(SPIRType &type);
void emit_resources();
void emit_buffer_block(const SPIRVariable &type);
void emit_push_constant_block(const SPIRVariable &var);
void emit_push_constant_block_vulkan(const SPIRVariable &var);
void emit_push_constant_block_glsl(const SPIRVariable &var);
void emit_interface_block(const SPIRVariable &type);
void emit_block_chain(SPIRBlock &block);
void emit_specialization_constant(const SPIRConstant &constant);
std::string emit_continue_block(uint32_t continue_block);
bool attempt_emit_loop_header(SPIRBlock &block, SPIRBlock::Method method);
void emit_uniform(const SPIRVariable &var);
void propagate_loop_dominators(const SPIRBlock &block);
void branch(uint32_t from, uint32_t to);
void branch(uint32_t from, uint32_t cond, uint32_t true_block, uint32_t false_block);
void flush_phi(uint32_t from, uint32_t to);
bool flush_phi_required(uint32_t from, uint32_t to);
void flush_variable_declaration(uint32_t id);
void flush_undeclared_variables(SPIRBlock &block);
bool should_forward(uint32_t id);
void emit_mix_op(uint32_t result_type, uint32_t id, uint32_t left, uint32_t right, uint32_t lerp);
bool to_trivial_mix_op(const SPIRType &type, std::string &op, uint32_t left, uint32_t right, uint32_t lerp);
void 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);
void emit_trinary_func_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, uint32_t op2,
const char *op);
void emit_binary_func_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, const char *op);
void emit_binary_func_op_cast(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, const char *op,
SPIRType::BaseType input_type, bool skip_cast_if_equal_type);
void emit_unary_func_op(uint32_t result_type, uint32_t result_id, uint32_t op0, const char *op);
void emit_binary_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, const char *op);
void emit_binary_op_cast(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, const char *op,
SPIRType::BaseType input_type, bool skip_cast_if_equal_type);
SPIRType binary_op_bitcast_helper(std::string &cast_op0, std::string &cast_op1, SPIRType::BaseType &input_type,
uint32_t op0, uint32_t op1, bool skip_cast_if_equal_type);
void emit_unary_op(uint32_t result_type, uint32_t result_id, uint32_t op0, const char *op);
bool expression_is_forwarded(uint32_t id);
SPIRExpression &emit_op(uint32_t result_type, uint32_t result_id, const std::string &rhs, bool forward_rhs,
bool suppress_usage_tracking = false);
std::string access_chain(uint32_t base, const uint32_t *indices, uint32_t count, bool index_is_literal,
bool chain_only = false);
const char *index_to_swizzle(uint32_t index);
std::string remap_swizzle(uint32_t result_type, uint32_t input_components, uint32_t expr);
std::string declare_temporary(uint32_t type, uint32_t id);
void append_global_func_args(const SPIRFunction &func, uint32_t index, std::vector<std::string> &arglist);
std::string to_expression(uint32_t id);
std::string to_enclosed_expression(uint32_t id);
void strip_enclosed_expression(std::string &expr);
std::string to_member_name(const SPIRType &type, uint32_t index);
std::string type_to_glsl_constructor(const SPIRType &type);
std::string argument_decl(const SPIRFunction::Parameter &arg);
std::string to_qualifiers_glsl(uint32_t id);
const char *to_precision_qualifiers_glsl(uint32_t id);
const char *flags_to_precision_qualifiers_glsl(const SPIRType &type, uint64_t flags);
const char *format_to_glsl(spv::ImageFormat format);
std::string layout_for_member(const SPIRType &type, uint32_t index);
std::string to_interpolation_qualifiers(uint64_t flags);
uint64_t combined_decoration_for_member(const SPIRType &type, uint32_t index);
std::string layout_for_variable(const SPIRVariable &variable);
std::string to_combined_image_sampler(uint32_t image_id, uint32_t samp_id);
bool skip_argument(uint32_t id) const;
bool ssbo_is_std430_packing(const SPIRType &type);
uint32_t type_to_std430_base_size(const SPIRType &type);
uint32_t type_to_std430_alignment(const SPIRType &type, uint64_t flags);
uint32_t type_to_std430_array_stride(const SPIRType &type, uint64_t flags);
uint32_t type_to_std430_size(const SPIRType &type, uint64_t flags);
std::string bitcast_glsl(const SPIRType &result_type, uint32_t arg);
std::string bitcast_glsl_op(const SPIRType &result_type, const SPIRType &argument_type);
std::string build_composite_combiner(const uint32_t *elems, uint32_t length);
bool remove_duplicate_swizzle(std::string &op);
bool remove_unity_swizzle(uint32_t base, std::string &op);
// Can modify flags to remote readonly/writeonly if image type
// and force recompile.
bool check_atomic_image(uint32_t id);
void replace_illegal_names();
void replace_fragment_output(SPIRVariable &var);
void replace_fragment_outputs();
std::string legacy_tex_op(const std::string &op, const SPIRType &imgtype);
uint32_t indent = 0;
std::unordered_set<uint32_t> emitted_functions;
// Usage tracking. If a temporary is used more than once, use the temporary instead to
// avoid AST explosion when SPIRV is generated with pure SSA and doesn't write stuff to variables.
std::unordered_map<uint32_t, uint32_t> expression_usage_counts;
std::unordered_set<uint32_t> forced_temporaries;
std::unordered_set<uint32_t> forwarded_temporaries;
void track_expression_read(uint32_t id);
std::unordered_set<std::string> forced_extensions;
std::vector<std::string> header_lines;
uint32_t statement_count;
inline bool is_legacy() const
{
return (options.es && options.version < 300) || (!options.es && options.version < 130);
}
inline bool is_legacy_es() const
{
return options.es && options.version < 300;
}
inline bool is_legacy_desktop() const
{
return !options.es && options.version < 130;
}
bool args_will_forward(uint32_t id, const uint32_t *args, uint32_t num_args, bool pure);
void register_call_out_argument(uint32_t id);
void register_impure_function_call();
// GL_EXT_shader_pixel_local_storage support.
std::vector<PlsRemap> pls_inputs;
std::vector<PlsRemap> pls_outputs;
std::string pls_decl(const PlsRemap &variable);
const char *to_pls_qualifiers_glsl(const SPIRVariable &variable);
void emit_pls();
void remap_pls_variables();
void add_variable(std::unordered_set<std::string> &variables, uint32_t id);
void check_function_call_constraints(const uint32_t *args, uint32_t length);
void handle_invalid_expression(uint32_t id);
void find_static_extensions();
};
}
#endif