/* * Copyright 2016-2019 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 #include #include #include #include namespace spirv_cross { // Indicates the format of the vertex attribute. Currently limited to specifying // if the attribute is an 8-bit unsigned integer, 16-bit unsigned integer, or // some other format. enum MSLVertexFormat { MSL_VERTEX_FORMAT_OTHER = 0, MSL_VERTEX_FORMAT_UINT8 = 1, MSL_VERTEX_FORMAT_UINT16 = 2, MSL_VERTEX_FORMAT_INT_MAX = 0x7fffffff }; // Defines MSL characteristics of a vertex attribute at a particular location. // After compilation, it is possible to query whether or not this location was used. struct MSLVertexAttr { uint32_t location = 0; uint32_t msl_buffer = 0; uint32_t msl_offset = 0; uint32_t msl_stride = 0; bool per_instance = false; MSLVertexFormat format = MSL_VERTEX_FORMAT_OTHER; spv::BuiltIn builtin = spv::BuiltInMax; }; // 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. // If using MSL 2.0 argument buffers, and the descriptor set is not marked as a discrete descriptor set, // the binding reference we remap to will become an [[id(N)]] attribute within // the "descriptor set" argument buffer structure. // For resources which are bound in the "classic" MSL 1.0 way or discrete descriptors, the remap will become a // [[buffer(N)]], [[texture(N)]] or [[sampler(N)]] depending on the resource types used. struct MSLResourceBinding { spv::ExecutionModel stage = spv::ExecutionModelMax; uint32_t desc_set = 0; uint32_t binding = 0; uint32_t msl_buffer = 0; uint32_t msl_texture = 0; uint32_t msl_sampler = 0; }; enum MSLSamplerCoord { MSL_SAMPLER_COORD_NORMALIZED = 0, MSL_SAMPLER_COORD_PIXEL = 1, MSL_SAMPLER_INT_MAX = 0x7fffffff }; enum MSLSamplerFilter { MSL_SAMPLER_FILTER_NEAREST = 0, MSL_SAMPLER_FILTER_LINEAR = 1, MSL_SAMPLER_FILTER_INT_MAX = 0x7fffffff }; enum MSLSamplerMipFilter { MSL_SAMPLER_MIP_FILTER_NONE = 0, MSL_SAMPLER_MIP_FILTER_NEAREST = 1, MSL_SAMPLER_MIP_FILTER_LINEAR = 2, MSL_SAMPLER_MIP_FILTER_INT_MAX = 0x7fffffff }; enum MSLSamplerAddress { MSL_SAMPLER_ADDRESS_CLAMP_TO_ZERO = 0, MSL_SAMPLER_ADDRESS_CLAMP_TO_EDGE = 1, MSL_SAMPLER_ADDRESS_CLAMP_TO_BORDER = 2, MSL_SAMPLER_ADDRESS_REPEAT = 3, MSL_SAMPLER_ADDRESS_MIRRORED_REPEAT = 4, MSL_SAMPLER_ADDRESS_INT_MAX = 0x7fffffff }; enum MSLSamplerCompareFunc { MSL_SAMPLER_COMPARE_FUNC_NEVER = 0, MSL_SAMPLER_COMPARE_FUNC_LESS = 1, MSL_SAMPLER_COMPARE_FUNC_LESS_EQUAL = 2, MSL_SAMPLER_COMPARE_FUNC_GREATER = 3, MSL_SAMPLER_COMPARE_FUNC_GREATER_EQUAL = 4, MSL_SAMPLER_COMPARE_FUNC_EQUAL = 5, MSL_SAMPLER_COMPARE_FUNC_NOT_EQUAL = 6, MSL_SAMPLER_COMPARE_FUNC_ALWAYS = 7, MSL_SAMPLER_COMPARE_FUNC_INT_MAX = 0x7fffffff }; enum MSLSamplerBorderColor { MSL_SAMPLER_BORDER_COLOR_TRANSPARENT_BLACK = 0, MSL_SAMPLER_BORDER_COLOR_OPAQUE_BLACK = 1, MSL_SAMPLER_BORDER_COLOR_OPAQUE_WHITE = 2, MSL_SAMPLER_BORDER_COLOR_INT_MAX = 0x7fffffff }; struct MSLConstexprSampler { MSLSamplerCoord coord = MSL_SAMPLER_COORD_NORMALIZED; MSLSamplerFilter min_filter = MSL_SAMPLER_FILTER_NEAREST; MSLSamplerFilter mag_filter = MSL_SAMPLER_FILTER_NEAREST; MSLSamplerMipFilter mip_filter = MSL_SAMPLER_MIP_FILTER_NONE; MSLSamplerAddress s_address = MSL_SAMPLER_ADDRESS_CLAMP_TO_EDGE; MSLSamplerAddress t_address = MSL_SAMPLER_ADDRESS_CLAMP_TO_EDGE; MSLSamplerAddress r_address = MSL_SAMPLER_ADDRESS_CLAMP_TO_EDGE; MSLSamplerCompareFunc compare_func = MSL_SAMPLER_COMPARE_FUNC_NEVER; MSLSamplerBorderColor border_color = MSL_SAMPLER_BORDER_COLOR_TRANSPARENT_BLACK; float lod_clamp_min = 0.0f; float lod_clamp_max = 1000.0f; int max_anisotropy = 1; bool compare_enable = false; bool lod_clamp_enable = false; bool anisotropy_enable = false; }; // Tracks the type ID and member index of a struct member using MSLStructMemberKey = uint64_t; // Special constant used in a MSLResourceBinding desc_set // element to indicate the bindings for the push constants. static const uint32_t kPushConstDescSet = ~(0u); // Special constant used in a MSLResourceBinding binding // element to indicate the bindings for the push constants. static const uint32_t kPushConstBinding = 0; static const uint32_t kMaxArgumentBuffers = 8; // The current version of the aux buffer structure. It must be incremented any time a // new field is added to the aux buffer. #define SPIRV_CROSS_MSL_AUX_BUFFER_STRUCT_VERSION 1 // Decompiles SPIR-V to Metal Shading Language class CompilerMSL : public CompilerGLSL { public: // Options for compiling to Metal Shading Language struct Options { typedef enum { iOS = 0, macOS = 1 } Platform; Platform platform = macOS; uint32_t msl_version = make_msl_version(1, 2); uint32_t texel_buffer_texture_width = 4096; // Width of 2D Metal textures used as 1D texel buffers uint32_t aux_buffer_index = 30; uint32_t indirect_params_buffer_index = 29; uint32_t shader_output_buffer_index = 28; uint32_t shader_patch_output_buffer_index = 27; uint32_t shader_tess_factor_buffer_index = 26; uint32_t shader_input_wg_index = 0; bool enable_point_size_builtin = true; bool disable_rasterization = false; bool capture_output_to_buffer = false; bool swizzle_texture_samples = false; bool tess_domain_origin_lower_left = false; // Enable use of MSL 2.0 indirect argument buffers. // MSL 2.0 must also be enabled. bool argument_buffers = false; // Fragment output in MSL must have at least as many components as the render pass. // Add support to explicit pad out components. bool pad_fragment_output_components = false; bool is_ios() { return platform == iOS; } bool is_macos() { return platform == macOS; } void set_msl_version(uint32_t major, uint32_t minor = 0, uint32_t patch = 0) { msl_version = make_msl_version(major, minor, patch); } bool supports_msl_version(uint32_t major, uint32_t minor = 0, uint32_t patch = 0) { return msl_version >= make_msl_version(major, minor, patch); } static uint32_t make_msl_version(uint32_t major, uint32_t minor = 0, uint32_t patch = 0) { return (major * 10000) + (minor * 100) + patch; } }; const Options &get_msl_options() const { return msl_options; } void set_msl_options(const Options &opts) { msl_options = opts; } // Provide feedback to calling API to allow runtime to disable pipeline // rasterization if vertex shader requires rasterization to be disabled. bool get_is_rasterization_disabled() const { return is_rasterization_disabled && (get_entry_point().model == spv::ExecutionModelVertex || get_entry_point().model == spv::ExecutionModelTessellationControl || get_entry_point().model == spv::ExecutionModelTessellationEvaluation); } // Provide feedback to calling API to allow it to pass an auxiliary // buffer if the shader needs it. bool needs_aux_buffer() const { return used_aux_buffer; } // Provide feedback to calling API to allow it to pass an output // buffer if the shader needs it. bool needs_output_buffer() const { return capture_output_to_buffer && stage_out_var_id != 0; } // Provide feedback to calling API to allow it to pass a patch output // buffer if the shader needs it. bool needs_patch_output_buffer() const { return capture_output_to_buffer && patch_stage_out_var_id != 0; } // Provide feedback to calling API to allow it to pass an input threadgroup // buffer if the shader needs it. bool needs_input_threadgroup_mem() const { return capture_output_to_buffer && stage_in_var_id != 0; } explicit CompilerMSL(std::vector spirv); CompilerMSL(const uint32_t *ir, size_t word_count); explicit CompilerMSL(const ParsedIR &ir); explicit CompilerMSL(ParsedIR &&ir); // attr is a vertex attribute binding used to match // vertex content locations to MSL attributes. If vertex attributes are provided, // is_msl_vertex_attribute_used() will return true after calling ::compile() if // the location was used by the MSL code. void add_msl_vertex_attribute(const MSLVertexAttr &attr); // resource is a resource binding 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, // is_msl_resource_binding_used() will return true after calling ::compile() if // the set/binding combination was used by the MSL code. void add_msl_resource_binding(const MSLResourceBinding &resource); // When using MSL argument buffers, we can force "classic" MSL 1.0 binding schemes for certain descriptor sets. // This corresponds to VK_KHR_push_descriptor in Vulkan. void add_discrete_descriptor_set(uint32_t desc_set); // Query after compilation is done. This allows you to check if a location or set/binding combination was used by the shader. bool is_msl_vertex_attribute_used(uint32_t location); bool is_msl_resource_binding_used(spv::ExecutionModel model, uint32_t set, uint32_t binding); // Compiles the SPIR-V code into Metal Shading Language. std::string compile() override; // Remap a sampler with ID to a constexpr sampler. // Older iOS targets must use constexpr samplers in certain cases (PCF), // so a static sampler must be used. // The sampler will not consume a binding, but be declared in the entry point as a constexpr sampler. // This can be used on both combined image/samplers (sampler2D) or standalone samplers. // The remapped sampler must not be an array of samplers. void remap_constexpr_sampler(uint32_t id, const MSLConstexprSampler &sampler); // If using CompilerMSL::Options::pad_fragment_output_components, override the number of components we expect // to use for a particular location. The default is 4 if number of components is not overridden. void set_fragment_output_components(uint32_t location, uint32_t components); protected: // An enum of SPIR-V functions that are implemented in additional // source code that is added to the shader if necessary. enum SPVFuncImpl { SPVFuncImplNone, SPVFuncImplMod, SPVFuncImplRadians, SPVFuncImplDegrees, SPVFuncImplFindILsb, SPVFuncImplFindSMsb, SPVFuncImplFindUMsb, SPVFuncImplSSign, SPVFuncImplArrayCopyMultidimBase, // Unfortunately, we cannot use recursive templates in the MSL compiler properly, // so stamp out variants up to some arbitrary maximum. SPVFuncImplArrayCopy = SPVFuncImplArrayCopyMultidimBase + 1, SPVFuncImplArrayOfArrayCopy2Dim = SPVFuncImplArrayCopyMultidimBase + 2, SPVFuncImplArrayOfArrayCopy3Dim = SPVFuncImplArrayCopyMultidimBase + 3, SPVFuncImplArrayOfArrayCopy4Dim = SPVFuncImplArrayCopyMultidimBase + 4, SPVFuncImplArrayOfArrayCopy5Dim = SPVFuncImplArrayCopyMultidimBase + 5, SPVFuncImplArrayOfArrayCopy6Dim = SPVFuncImplArrayCopyMultidimBase + 6, SPVFuncImplTexelBufferCoords, SPVFuncImplInverse4x4, SPVFuncImplInverse3x3, SPVFuncImplInverse2x2, SPVFuncImplRowMajor2x3, SPVFuncImplRowMajor2x4, SPVFuncImplRowMajor3x2, SPVFuncImplRowMajor3x4, SPVFuncImplRowMajor4x2, SPVFuncImplRowMajor4x3, SPVFuncImplTextureSwizzle, SPVFuncImplArrayCopyMultidimMax = 6 }; void emit_binary_unord_op(uint32_t result_type, uint32_t result_id, uint32_t op0, uint32_t op1, const char *op); 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, const Bitset &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 to_struct_member(const SPIRType &type, uint32_t member_type_id, uint32_t index, const std::string &qualifier = ""); void emit_struct_member(const SPIRType &type, uint32_t member_type_id, uint32_t index, const std::string &qualifier = "", uint32_t base_offset = 0) override; std::string type_to_glsl(const SPIRType &type, uint32_t id = 0) override; std::string image_type_glsl(const SPIRType &type, uint32_t id = 0) override; std::string sampler_type(const SPIRType &type); std::string builtin_to_glsl(spv::BuiltIn builtin, spv::StorageClass storage) 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) const 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_dref, uint32_t lod) 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; std::string to_initializer_expression(const SPIRVariable &var) override; std::string unpack_expression_type(std::string expr_str, const SPIRType &type, uint32_t packed_type_id) override; std::string bitcast_glsl_op(const SPIRType &result_type, const SPIRType &argument_type) override; bool skip_argument(uint32_t id) const override; std::string to_member_reference(uint32_t base, const SPIRType &type, uint32_t index, bool ptr_chain) override; std::string to_qualifiers_glsl(uint32_t id) override; void replace_illegal_names() override; void declare_undefined_values() override; void declare_constant_arrays(); bool is_patch_block(const SPIRType &type); bool is_non_native_row_major_matrix(uint32_t id) override; bool member_is_non_native_row_major_matrix(const SPIRType &type, uint32_t index) override; std::string convert_row_major_matrix(std::string exp_str, const SPIRType &exp_type, bool is_packed) override; void preprocess_op_codes(); void localize_global_variables(); void extract_global_variables_from_functions(); void mark_packable_structs(); void mark_as_packable(SPIRType &type); std::unordered_map> function_global_vars; void extract_global_variables_from_function(uint32_t func_id, std::set &added_arg_ids, std::unordered_set &global_var_ids, std::unordered_set &processed_func_ids); uint32_t add_interface_block(spv::StorageClass storage, bool patch = false); uint32_t add_interface_block_pointer(uint32_t ib_var_id, spv::StorageClass storage); void add_variable_to_interface_block(spv::StorageClass storage, const std::string &ib_var_ref, SPIRType &ib_type, SPIRVariable &var, bool strip_array); void add_composite_variable_to_interface_block(spv::StorageClass storage, const std::string &ib_var_ref, SPIRType &ib_type, SPIRVariable &var, bool strip_array); void add_plain_variable_to_interface_block(spv::StorageClass storage, const std::string &ib_var_ref, SPIRType &ib_type, SPIRVariable &var, bool strip_array); void add_plain_member_variable_to_interface_block(spv::StorageClass storage, const std::string &ib_var_ref, SPIRType &ib_type, SPIRVariable &var, uint32_t index, bool strip_array); void add_composite_member_variable_to_interface_block(spv::StorageClass storage, const std::string &ib_var_ref, SPIRType &ib_type, SPIRVariable &var, uint32_t index, bool strip_array); uint32_t get_accumulated_member_location(const SPIRVariable &var, uint32_t mbr_idx, bool strip_array); void add_tess_level_input_to_interface_block(const std::string &ib_var_ref, SPIRType &ib_type, SPIRVariable &var); void fix_up_interface_member_indices(spv::StorageClass storage, uint32_t ib_type_id); void mark_location_as_used_by_shader(uint32_t location, spv::StorageClass storage); uint32_t ensure_correct_builtin_type(uint32_t type_id, spv::BuiltIn builtin); uint32_t ensure_correct_attribute_type(uint32_t type_id, uint32_t location); void emit_custom_functions(); void emit_resources(); void emit_specialization_constants_and_structs(); void emit_interface_block(uint32_t ib_var_id); bool maybe_emit_array_assignment(uint32_t id_lhs, uint32_t id_rhs); void add_convert_row_major_matrix_function(uint32_t cols, uint32_t rows); void fix_up_shader_inputs_outputs(); std::string func_type_decl(SPIRType &type); std::string entry_point_args_classic(bool append_comma); std::string entry_point_args_argument_buffer(bool append_comma); std::string entry_point_arg_stage_in(); void entry_point_args_builtin(std::string &args); void entry_point_args_discrete_descriptors(std::string &args); 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 to_swizzle_expression(uint32_t id); std::string builtin_qualifier(spv::BuiltIn builtin); std::string builtin_type_decl(spv::BuiltIn builtin); std::string built_in_func_arg(spv::BuiltIn builtin, bool prefix_comma); std::string member_attribute_qualifier(const SPIRType &type, uint32_t index); std::string argument_decl(const SPIRFunction::Parameter &arg); std::string round_fp_tex_coords(std::string tex_coords, bool coord_is_fp); uint32_t get_metal_resource_index(SPIRVariable &var, SPIRType::BaseType basetype); uint32_t get_ordered_member_location(uint32_t type_id, uint32_t index, uint32_t *comp = nullptr); size_t get_declared_struct_member_alignment(const SPIRType &struct_type, uint32_t index) const; std::string to_component_argument(uint32_t id); void align_struct(SPIRType &ib_type); bool is_member_packable(SPIRType &ib_type, uint32_t index); MSLStructMemberKey get_struct_member_key(uint32_t type_id, uint32_t index); std::string get_argument_address_space(const SPIRVariable &argument); std::string get_type_address_space(const SPIRType &type, uint32_t id); SPIRType &get_stage_in_struct_type(); SPIRType &get_stage_out_struct_type(); SPIRType &get_patch_stage_in_struct_type(); SPIRType &get_patch_stage_out_struct_type(); std::string get_tess_factor_struct_name(); void emit_atomic_func_op(uint32_t result_type, uint32_t result_id, const char *op, uint32_t mem_order_1, uint32_t mem_order_2, bool has_mem_order_2, uint32_t op0, uint32_t op1 = 0, bool op1_is_pointer = false, bool op1_is_literal = false, uint32_t op2 = 0); const char *get_memory_order(uint32_t spv_mem_sem); void add_pragma_line(const std::string &line); void add_typedef_line(const std::string &line); void emit_barrier(uint32_t id_exe_scope, uint32_t id_mem_scope, uint32_t id_mem_sem); void emit_array_copy(const std::string &lhs, uint32_t rhs_id) override; void build_implicit_builtins(); void emit_entry_point_declarations() override; uint32_t builtin_frag_coord_id = 0; uint32_t builtin_sample_id_id = 0; uint32_t builtin_vertex_idx_id = 0; uint32_t builtin_base_vertex_id = 0; uint32_t builtin_instance_idx_id = 0; uint32_t builtin_base_instance_id = 0; uint32_t builtin_invocation_id_id = 0; uint32_t builtin_primitive_id_id = 0; uint32_t aux_buffer_id = 0; void bitcast_to_builtin_store(uint32_t target_id, std::string &expr, const SPIRType &expr_type) override; void bitcast_from_builtin_load(uint32_t source_id, std::string &expr, const SPIRType &expr_type) override; void emit_store_statement(uint32_t lhs_expression, uint32_t rhs_expression) override; void analyze_sampled_image_usage(); bool emit_tessellation_access_chain(const uint32_t *ops, uint32_t length); bool is_out_of_bounds_tessellation_level(uint32_t id_lhs); Options msl_options; std::set spv_function_implementations; std::unordered_map vtx_attrs_by_location; std::unordered_map vtx_attrs_by_builtin; std::unordered_set vtx_attrs_in_use; std::unordered_map fragment_output_components; std::unordered_map struct_member_padding; std::set pragma_lines; std::set typedef_lines; std::vector vars_needing_early_declaration; std::vector> resource_bindings; uint32_t next_metal_resource_index_buffer = 0; uint32_t next_metal_resource_index_texture = 0; uint32_t next_metal_resource_index_sampler = 0; uint32_t stage_in_var_id = 0; uint32_t stage_out_var_id = 0; uint32_t patch_stage_in_var_id = 0; uint32_t patch_stage_out_var_id = 0; uint32_t stage_in_ptr_var_id = 0; uint32_t stage_out_ptr_var_id = 0; bool has_sampled_images = false; bool needs_vertex_idx_arg = false; bool needs_instance_idx_arg = false; bool is_rasterization_disabled = false; bool capture_output_to_buffer = false; bool needs_aux_buffer_def = false; bool used_aux_buffer = false; bool added_builtin_tess_level = false; std::string qual_pos_var_name; std::string stage_in_var_name = "in"; std::string stage_out_var_name = "out"; std::string patch_stage_in_var_name = "patchIn"; std::string patch_stage_out_var_name = "patchOut"; std::string sampler_name_suffix = "Smplr"; std::string swizzle_name_suffix = "Swzl"; std::string input_wg_var_name = "gl_in"; std::string output_buffer_var_name = "spvOut"; std::string patch_output_buffer_var_name = "spvPatchOut"; std::string tess_factor_buffer_var_name = "spvTessLevel"; spv::Op previous_instruction_opcode = spv::OpNop; std::unordered_map constexpr_samplers; std::vector buffer_arrays; uint32_t argument_buffer_ids[kMaxArgumentBuffers]; uint32_t argument_buffer_discrete_mask = 0; void analyze_argument_buffers(); bool descriptor_set_is_argument_buffer(uint32_t desc_set) const; uint32_t get_target_components_for_fragment_location(uint32_t location) const; uint32_t build_extended_vector_type(uint32_t type_id, uint32_t components); // 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::SPVFuncImpl get_spv_func_impl(spv::Op opcode, const uint32_t *args); void check_resource_write(uint32_t var_id); CompilerMSL &compiler; std::unordered_map result_types; bool suppress_missing_prototypes = false; bool uses_atomics = false; bool uses_resource_write = false; }; // OpcodeHandler that scans for uses of sampled images struct SampledImageScanner : OpcodeHandler { SampledImageScanner(CompilerMSL &compiler_) : compiler(compiler_) { } bool handle(spv::Op opcode, const uint32_t *args, uint32_t) override; CompilerMSL &compiler; }; // 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); SPIRType &type; Meta &meta; SortAspect sort_aspect; }; }; } // namespace spirv_cross #endif