| // Copyright 2023 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "src/tint/lang/hlsl/writer/ast_raise/pixel_local.h" |
| |
| #include <string> |
| #include <utility> |
| |
| #include "src/tint/lang/core/fluent_types.h" |
| #include "src/tint/lang/core/number.h" |
| #include "src/tint/lang/wgsl/program/clone_context.h" |
| #include "src/tint/lang/wgsl/resolver/resolve.h" |
| #include "src/tint/lang/wgsl/sem/function.h" |
| #include "src/tint/lang/wgsl/sem/module.h" |
| #include "src/tint/lang/wgsl/sem/statement.h" |
| #include "src/tint/lang/wgsl/sem/struct.h" |
| #include "src/tint/utils/containers/transform.h" |
| #include "src/tint/utils/rtti/switch.h" |
| |
| TINT_INSTANTIATE_TYPEINFO(tint::hlsl::writer::PixelLocal); |
| TINT_INSTANTIATE_TYPEINFO(tint::hlsl::writer::PixelLocal::RasterizerOrderedView); |
| TINT_INSTANTIATE_TYPEINFO(tint::hlsl::writer::PixelLocal::Config); |
| |
| using namespace tint::core::fluent_types; // NOLINT |
| |
| namespace tint::hlsl::writer { |
| |
| /// PIMPL state for the transform |
| struct PixelLocal::State { |
| /// The source program |
| const Program& src; |
| /// The semantic information of the source program |
| const sem::Info& sem; |
| /// The target program builder |
| ProgramBuilder b; |
| /// The clone context |
| program::CloneContext ctx = {&b, &src, /* auto_clone_symbols */ true}; |
| /// The transform config |
| const Config& cfg; |
| |
| /// Constructor |
| /// @param program the source program |
| /// @param config the transform config |
| State(const Program& program, const Config& config) |
| : src(program), sem(program.Sem()), cfg(config) {} |
| |
| /// Runs the transform |
| /// @returns the new program or SkipTransform if the transform is not required |
| ApplyResult Run() { |
| // If the pixel local extension isn't enabled, then there must be no use of pixel_local |
| // variables, and so there's nothing for this transform to do. |
| if (!sem.Module()->Extensions().Contains( |
| wgsl::Extension::kChromiumExperimentalPixelLocal)) { |
| return SkipTransform; |
| } |
| |
| bool made_changes = false; |
| |
| // Change all module scope `var<pixel_local>` variables to `var<private>`. |
| // We need to do this even if the variable is not referenced by the entry point as later |
| // stages do not understand the pixel_local address space. |
| for (auto* global : src.AST().GlobalVariables()) { |
| if (auto* var = global->As<ast::Var>()) { |
| if (sem.Get(var)->AddressSpace() == core::AddressSpace::kPixelLocal) { |
| // Change the 'var<pixel_local>' to 'var<private>' |
| ctx.Replace(var->declared_address_space, b.Expr(core::AddressSpace::kPrivate)); |
| made_changes = true; |
| } |
| } |
| } |
| |
| // Find the single entry point |
| const sem::Function* entry_point = nullptr; |
| for (auto* fn : src.AST().Functions()) { |
| if (fn->IsEntryPoint()) { |
| if (entry_point != nullptr) { |
| TINT_ICE() << "PixelLocal transform requires that the SingleEntryPoint " |
| "transform has already been run"; |
| return SkipTransform; |
| } |
| entry_point = sem.Get(fn); |
| |
| // Look for a `var<pixel_local>` used by the entry point... |
| const tint::sem::GlobalVariable* pixel_local_variable = nullptr; |
| for (auto* global : entry_point->TransitivelyReferencedGlobals()) { |
| if (global->AddressSpace() == core::AddressSpace::kPixelLocal) { |
| pixel_local_variable = global; |
| made_changes = true; |
| break; |
| } |
| } |
| if (pixel_local_variable == nullptr) { |
| continue; |
| } |
| |
| // Obtain struct of the pixel local. |
| auto* pixel_local_str = |
| pixel_local_variable->Type()->UnwrapRef()->As<sem::Struct>(); |
| TransformEntryPoint(entry_point, pixel_local_variable, pixel_local_str); |
| |
| break; // Only a single `var<pixel_local>` can be used by an entry point. |
| } |
| } |
| |
| if (!made_changes) { |
| return SkipTransform; |
| } |
| |
| ctx.Clone(); |
| return resolver::Resolve(b); |
| } |
| |
| /// Transforms the entry point @p entry_point to handle the direct or transitive usage of the |
| /// `var<pixel_local>` @p pixel_local_var. |
| /// @param entry_point the entry point |
| /// @param pixel_local_var the `var<pixel_local>` |
| /// @param pixel_local_str the struct type of the var |
| void TransformEntryPoint(const sem::Function* entry_point, |
| const sem::GlobalVariable* pixel_local_var, |
| const sem::Struct* pixel_local_str) { |
| // Wrap the old entry point "fn" into a new entry point where functions to load and store |
| // ROV data are called. |
| auto* original_entry_point_fn = entry_point->Declaration(); |
| auto entry_point_name = original_entry_point_fn->name->symbol.Name(); |
| |
| // Remove the @fragment attribute from the entry point |
| ctx.Remove(original_entry_point_fn->attributes, |
| ast::GetAttribute<ast::StageAttribute>(original_entry_point_fn->attributes)); |
| // Rename the entry point. |
| auto inner_function_name = b.Symbols().New(entry_point_name + "_inner"); |
| ctx.Replace(original_entry_point_fn->name, b.Ident(inner_function_name)); |
| |
| // Create a new function that wraps the entry point. |
| // This function has all the existing entry point parameters and an additional |
| // parameter for the input pixel local structure. |
| auto new_entry_point_params = ctx.Clone(original_entry_point_fn->params); |
| |
| // Remove any entry-point attributes from the inner function. |
| // This must come after `ctx.Clone(fn->params)` as we want these attributes on the outer |
| // function. |
| for (auto* param : original_entry_point_fn->params) { |
| for (auto* attr : param->attributes) { |
| if (attr->IsAnyOf<ast::BuiltinAttribute, ast::LocationAttribute, |
| ast::InterpolateAttribute, ast::InvariantAttribute>()) { |
| ctx.Remove(param->attributes, attr); |
| } |
| } |
| } |
| |
| // Declare the ROVs for the members of the pixel local variable and the functions to |
| // load data from and store data into the ROVs. |
| auto load_rov_function_name = b.Symbols().New("load_from_pixel_local_storage"); |
| auto store_rov_function_name = b.Symbols().New("store_into_pixel_local_storage"); |
| DeclareROVsAndLoadStoreFunctions(load_rov_function_name, store_rov_function_name, |
| pixel_local_var->Declaration()->name->symbol.Name(), |
| pixel_local_str); |
| |
| // Declare new entry point |
| Vector<const ast::Statement*, 5> new_entry_point_function_body; |
| |
| // 1. let `hlsl_sv_position` be `@builtin(position)` |
| // Declare `@builtin(position)` in the input parameter of the new entry point if it is not |
| // declared in the original entry point. |
| auto sv_position_symbol = b.Symbols().New("hlsl_sv_position"); |
| new_entry_point_function_body.Push(DeclareVariableWithBuiltinPosition( |
| new_entry_point_params, sv_position_symbol, entry_point)); |
| |
| // 2. Call `load_from_pixel_local_storage(hlsl_sv_position)` |
| new_entry_point_function_body.Push( |
| b.CallStmt(b.Call(load_rov_function_name, sv_position_symbol))); |
| |
| // Declare the inner function |
| // Build the arguments to call the inner function |
| auto inner_function_call_args = tint::Transform( |
| original_entry_point_fn->params, [&](auto* p) { return b.Expr(ctx.Clone(p->name)); }); |
| |
| ast::Type new_entry_point_return_type; |
| if (original_entry_point_fn->return_type) { |
| // Create a structure to hold the combined flattened result of the entry point with |
| // `@location` attribute |
| auto new_entry_point_return_struct_name = b.Symbols().New(entry_point_name + "_res"); |
| Vector<const ast::StructMember*, 8> members; |
| // arguments to the final `return` statement in the new entry point |
| Vector<const ast::Expression*, 8> new_entry_point_return_value_constructor_args; |
| |
| auto add_member = [&](const core::type::Type* ty, |
| VectorRef<const ast::Attribute*> attrs) { |
| members.Push(b.Member("output_" + std::to_string(members.Length()), |
| CreateASTTypeFor(ctx, ty), std::move(attrs))); |
| }; |
| |
| Symbol inner_function_call_result = b.Symbols().New("result"); |
| if (auto* str = entry_point->ReturnType()->As<sem::Struct>()) { |
| // The entry point returned a structure. |
| for (auto* member : str->Members()) { |
| auto& member_attrs = member->Declaration()->attributes; |
| add_member(member->Type(), ctx.Clone(member_attrs)); |
| new_entry_point_return_value_constructor_args.Push( |
| b.MemberAccessor(inner_function_call_result, ctx.Clone(member->Name()))); |
| if (auto* location = ast::GetAttribute<ast::LocationAttribute>(member_attrs)) { |
| // Remove the @location attribute from the member of the inner function's |
| // output structure. |
| // Note: This will break other entry points that share the same output |
| // structure, however this transform assumes that the SingleEntryPoint |
| // transform will have already been run. |
| ctx.Remove(member_attrs, location); |
| } |
| } |
| } else { |
| // The entry point returned a non-structure |
| add_member(entry_point->ReturnType(), |
| ctx.Clone(original_entry_point_fn->return_type_attributes)); |
| new_entry_point_return_value_constructor_args.Push( |
| b.Expr(inner_function_call_result)); |
| |
| // Remove the @location from the inner function's return type attributes |
| ctx.Remove(original_entry_point_fn->return_type_attributes, |
| ast::GetAttribute<ast::LocationAttribute>( |
| original_entry_point_fn->return_type_attributes)); |
| } |
| |
| // 3. Call inner function and get the return value |
| new_entry_point_function_body.Push( |
| b.Decl(b.Let(inner_function_call_result, |
| b.Call(inner_function_name, std::move(inner_function_call_args))))); |
| |
| // Declare the output structure |
| b.Structure(new_entry_point_return_struct_name, std::move(members)); |
| |
| // 4. Call `store_into_pixel_local_storage(hlsl_sv_position)` |
| new_entry_point_function_body.Push( |
| b.CallStmt(b.Call(store_rov_function_name, sv_position_symbol))); |
| |
| // 5. Return the output structure |
| new_entry_point_function_body.Push( |
| b.Return(b.Call(new_entry_point_return_struct_name, |
| std::move(new_entry_point_return_value_constructor_args)))); |
| |
| new_entry_point_return_type = b.ty(new_entry_point_return_struct_name); |
| } else { |
| // 3. Call inner function without return value |
| new_entry_point_function_body.Push( |
| b.CallStmt(b.Call(inner_function_name, std::move(inner_function_call_args)))); |
| |
| // 4. Call `store_into_pixel_local_storage(hlsl_sv_position)` |
| new_entry_point_function_body.Push( |
| b.CallStmt(b.Call(store_rov_function_name, sv_position_symbol))); |
| |
| new_entry_point_return_type = b.ty.void_(); |
| } |
| |
| // Declare the new entry point that calls the inner function |
| b.Func(entry_point_name, std::move(new_entry_point_params), new_entry_point_return_type, |
| new_entry_point_function_body, Vector{b.Stage(ast::PipelineStage::kFragment)}); |
| } |
| |
| /// Add the declarations of all the ROVs as a special type of read-write storage texture that |
| /// represent the pixel local variable, the functions to load data from them and store data into |
| /// them. |
| /// @param load_rov_function_name the name of the funtion that loads the data from the ROVs |
| /// @param store_rov_function_name the name of the function that stores the data into the ROVs |
| /// @param pixel_local_variable_name the name of the pixel local variable |
| /// @param pixel_local_str the struct type of the pixel local variable |
| void DeclareROVsAndLoadStoreFunctions(const Symbol& load_rov_function_name, |
| const Symbol& store_rov_function_name, |
| const std::string& pixel_local_variable_name, |
| const sem::Struct* pixel_local_str) { |
| std::string_view load_store_input_name = "my_input"; |
| Vector load_parameters{b.Param(load_store_input_name, b.ty.vec4<f32>())}; |
| Vector store_parameters{b.Param(load_store_input_name, b.ty.vec4<f32>())}; |
| |
| // 1 declaration of `rov_texcoord` and at most 4 texture[Load|Store] calls (now the maximum |
| // size of PLS is 16) |
| Vector<const ast::Statement*, 5> load_body; |
| Vector<const ast::Statement*, 5> store_body; |
| |
| // let rov_texcoord = vec2u(my_input.xy); |
| auto rov_texcoord = b.Symbols().New("rov_texcoord"); |
| load_body.Push(b.Decl( |
| b.Let(rov_texcoord, b.Call("vec2u", b.MemberAccessor(load_store_input_name, "xy"))))); |
| store_body.Push(b.Decl( |
| b.Let(rov_texcoord, b.Call("vec2u", b.MemberAccessor(load_store_input_name, "xy"))))); |
| |
| for (auto* member : pixel_local_str->Members()) { |
| // Declare the read-write storage texture with RasterizerOrderedView attribute. |
| auto member_format = Switch( |
| member->Type(), // |
| [&](const core::type::U32*) { return core::TexelFormat::kR32Uint; }, |
| [&](const core::type::I32*) { return core::TexelFormat::kR32Sint; }, |
| [&](const core::type::F32*) { return core::TexelFormat::kR32Float; }, |
| TINT_ICE_ON_NO_MATCH); |
| auto rov_format = ROVTexelFormat(member->Index()); |
| auto rov_type = b.ty.storage_texture(core::type::TextureDimension::k2d, rov_format, |
| core::Access::kReadWrite); |
| auto rov_symbol_name = b.Symbols().New("pixel_local_" + member->Name().Name()); |
| b.GlobalVar(rov_symbol_name, rov_type, |
| tint::Vector{b.Binding(AInt(ROVRegisterIndex(member->Index()))), |
| b.Group(AInt(cfg.rov_group_index)), RasterizerOrderedView()}); |
| |
| // The function body of loading from PLS |
| // PLS_Private_Variable.member = textureLoad(pixel_local_member, rov_texcoord).x; |
| // Or |
| // PLS_Private_Variable.member = |
| // bitcast(textureLoad(pixel_local_member, rov_texcoord).x); |
| auto pixel_local_var_member_access_in_load_call = |
| b.MemberAccessor(pixel_local_variable_name, ctx.Clone(member->Name())); |
| auto load_call = b.Call(wgsl::BuiltinFn::kTextureLoad, rov_symbol_name, rov_texcoord); |
| auto to_scalar_call = b.MemberAccessor(load_call, "x"); |
| if (rov_format == member_format) { |
| load_body.Push( |
| b.Assign(pixel_local_var_member_access_in_load_call, to_scalar_call)); |
| } else { |
| auto member_ast_type = Switch( |
| member->Type(), // |
| [&](const core::type::U32*) { return b.ty.u32(); }, |
| [&](const core::type::I32*) { return b.ty.i32(); }, |
| [&](const core::type::F32*) { return b.ty.f32(); }, // |
| TINT_ICE_ON_NO_MATCH); |
| |
| auto bitcast_to_member_type_call = b.Bitcast(member_ast_type, to_scalar_call); |
| load_body.Push(b.Assign(pixel_local_var_member_access_in_load_call, |
| bitcast_to_member_type_call)); |
| } |
| |
| // The function body of storing data into PLS |
| // textureStore(pixel_local_member, rov_texcoord, vec4u(PLS_Private_Variable.member)); |
| // Or |
| // textureStore( |
| // pixel_local_member, rov_texcoord, vec4u(bitcast(PLS_Private_Variable.member))); |
| std::string rov_pixel_type; |
| switch (rov_format) { |
| case core::TexelFormat::kR32Uint: |
| rov_pixel_type = "vec4u"; |
| break; |
| case core::TexelFormat::kR32Sint: |
| rov_pixel_type = "vec4i"; |
| break; |
| case core::TexelFormat::kR32Float: |
| rov_pixel_type = "vec4f"; |
| break; |
| default: |
| TINT_ICE() << "Invalid ROV format (now only R32Uint, R32Sint and R32Float are " |
| "supported)"; |
| break; |
| } |
| auto pixel_local_var_member_access_in_store_call = |
| b.MemberAccessor(pixel_local_variable_name, ctx.Clone(member->Name())); |
| const ast::CallExpression* to_vec4_call = nullptr; |
| if (rov_format == member_format) { |
| to_vec4_call = b.Call(rov_pixel_type, pixel_local_var_member_access_in_store_call); |
| } else { |
| ast::Type rov_pixel_ast_type; |
| switch (rov_format) { |
| case core::TexelFormat::kR32Uint: |
| rov_pixel_ast_type = b.ty.u32(); |
| break; |
| case core::TexelFormat::kR32Sint: |
| rov_pixel_ast_type = b.ty.i32(); |
| break; |
| case core::TexelFormat::kR32Float: |
| rov_pixel_ast_type = b.ty.f32(); |
| break; |
| default: |
| TINT_UNREACHABLE(); |
| break; |
| } |
| auto bitcast_to_rov_format_call = |
| b.Bitcast(rov_pixel_ast_type, pixel_local_var_member_access_in_store_call); |
| to_vec4_call = b.Call(rov_pixel_type, bitcast_to_rov_format_call); |
| } |
| auto store_call = |
| b.Call(wgsl::BuiltinFn::kTextureStore, rov_symbol_name, rov_texcoord, to_vec4_call); |
| store_body.Push(b.CallStmt(store_call)); |
| } |
| |
| b.Func(load_rov_function_name, std::move(load_parameters), b.ty.void_(), load_body); |
| b.Func(store_rov_function_name, std::move(store_parameters), b.ty.void_(), store_body); |
| } |
| |
| /// Find and get `@builtin(position)` which is needed for loading and storing data with ROVs |
| /// @returns the statement object that initializes `new_entry_point_params` with |
| /// `@builtin(position)`. |
| /// @param new_entry_point_params the input parameters of the new entry point. |
| /// `@builtin(position)` may be added if it is not in `new_entry_point_params`. |
| /// @param variable_with_position_symbol the name of the variable that will be initialized with |
| /// `@builtin(position)`. |
| /// @param entry_point the semantic information of the entry point |
| const ast::VariableDeclStatement* DeclareVariableWithBuiltinPosition( |
| tint::Vector<const ast::Parameter*, 8>& new_entry_point_params, |
| const tint::Symbol& variable_with_position_symbol, |
| const sem::Function* entry_point) { |
| for (size_t i = 0; i < entry_point->Parameters().Length(); ++i) { |
| auto* parameter = entry_point->Parameters()[i]; |
| // 1. `@builtin(position)` is declared as a member of a structure |
| if (auto* struct_type = parameter->Type()->As<sem::Struct>()) { |
| for (auto* member : struct_type->Members()) { |
| if (member->Attributes().builtin == core::BuiltinValue::kPosition) { |
| return b.Decl(b.Let( |
| variable_with_position_symbol, |
| b.MemberAccessor(new_entry_point_params[i], member->Name().Name()))); |
| } |
| } |
| } |
| // 2. `@builtin(position)` is declared as an individual input parameter |
| if (auto* attribute = ast::GetAttribute<ast::BuiltinAttribute>( |
| parameter->Declaration()->attributes)) { |
| auto builtin = sem.Get(attribute)->Value(); |
| if (builtin == core::BuiltinValue::kPosition) { |
| return b.Decl( |
| b.Let(variable_with_position_symbol, b.Expr(new_entry_point_params[i]))); |
| } |
| } |
| } |
| |
| // 3. `@builtin(position)` is not declared in the input parameters and we should add one |
| auto* new_position = b.Param(b.Symbols().New("my_pos"), b.ty.vec4<f32>(), |
| Vector{b.Builtin(core::BuiltinValue::kPosition)}); |
| new_entry_point_params.Push(new_position); |
| return b.Decl(b.Let(variable_with_position_symbol, b.Expr(new_position))); |
| } |
| |
| /// @returns a new RasterizerOrderedView attribute |
| PixelLocal::RasterizerOrderedView* RasterizerOrderedView() { |
| return b.ASTNodes().Create<PixelLocal::RasterizerOrderedView>(b.ID(), b.AllocateNodeID()); |
| } |
| |
| /// @returns the register index for the pixel local field with the given index |
| /// @param field_index the pixel local field index |
| uint32_t ROVRegisterIndex(uint32_t field_index) { |
| auto idx = cfg.pls_member_to_rov_reg.Get(field_index); |
| if (TINT_UNLIKELY(!idx)) { |
| b.Diagnostics().add_error(diag::System::Transform, |
| "PixelLocal::Config::attachments missing entry for field " + |
| std::to_string(field_index)); |
| return 0; |
| } |
| return *idx; |
| } |
| |
| /// @returns the texel format for the pixel local field with the given index |
| /// @param field_index the pixel local field index |
| core::TexelFormat ROVTexelFormat(uint32_t field_index) { |
| auto format = cfg.pls_member_to_rov_format.Get(field_index); |
| if (TINT_UNLIKELY(!format)) { |
| b.Diagnostics().add_error(diag::System::Transform, |
| "PixelLocal::Config::attachments missing entry for field " + |
| std::to_string(field_index)); |
| return core::TexelFormat::kUndefined; |
| } |
| return *format; |
| } |
| }; |
| |
| PixelLocal::PixelLocal() = default; |
| |
| PixelLocal::~PixelLocal() = default; |
| |
| ast::transform::Transform::ApplyResult PixelLocal::Apply(const Program& src, |
| const ast::transform::DataMap& inputs, |
| ast::transform::DataMap&) const { |
| auto* cfg = inputs.Get<Config>(); |
| if (!cfg) { |
| ProgramBuilder b; |
| b.Diagnostics().add_error(diag::System::Transform, |
| "missing transform data for " + std::string(TypeInfo().name)); |
| return resolver::Resolve(b); |
| } |
| |
| return State(src, *cfg).Run(); |
| } |
| |
| PixelLocal::Config::Config() = default; |
| |
| PixelLocal::Config::Config(const Config&) = default; |
| |
| PixelLocal::Config::~Config() = default; |
| |
| PixelLocal::RasterizerOrderedView::RasterizerOrderedView(GenerationID pid, ast::NodeID nid) |
| : Base(pid, nid, Empty) {} |
| |
| PixelLocal::RasterizerOrderedView::~RasterizerOrderedView() = default; |
| |
| std::string PixelLocal::RasterizerOrderedView::InternalName() const { |
| return "rov"; |
| } |
| |
| const PixelLocal::RasterizerOrderedView* PixelLocal::RasterizerOrderedView::Clone( |
| ast::CloneContext& ctx) const { |
| return ctx.dst->ASTNodes().Create<RasterizerOrderedView>(ctx.dst->ID(), |
| ctx.dst->AllocateNodeID()); |
| } |
| |
| } // namespace tint::hlsl::writer |
