src/writer/hlsl/generator_impl_function_test.cc - tint - Git at Google

 // Copyright 2020 The Tint Authors.
 //
 // 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 "gmock/gmock.h"
 #include "src/ast/stage_decoration.h"
 #include "src/ast/struct_block_decoration.h"
 #include "src/ast/variable_decl_statement.h"
 #include "src/ast/workgroup_decoration.h"
 #include "src/writer/hlsl/test_helper.h"

 using ::testing::HasSubstr;

 namespace tint {
 namespace writer {
 namespace hlsl {
 namespace {

 using HlslGeneratorImplTest_Function = TestHelper;

 TEST_F(HlslGeneratorImplTest_Function, Emit_Function) {
   Func("my_func", ast::VariableList{}, ty.void_(),
        {
            Return(),
        });

   GeneratorImpl& gen = Build();

   gen.increment_indent();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(  void my_func() {
     return;
   }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function, Emit_Function_Name_Collision) {
   Func("GeometryShader", ast::VariableList{}, ty.void_(),
        {
            Return(),
        });

   GeneratorImpl& gen = SanitizeAndBuild();

   gen.increment_indent();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_THAT(gen.result(), HasSubstr(R"(  void tint_symbol() {
     return;
   })"));
 }

 TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithParams) {
   Func("my_func", ast::VariableList{Param("a", ty.f32()), Param("b", ty.i32())},
        ty.void_(),
        {
            Return(),
        });

   GeneratorImpl& gen = Build();

   gen.increment_indent();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(  void my_func(float a, int b) {
     return;
   }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_NoReturn_Void) {
   Func("main", ast::VariableList{}, ty.void_(), {/* no explicit return */},
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(void main() {
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function, PtrParameter) {
   // fn f(foo : ptr<function, f32>) -> f32 {
   //   return *foo;
   // }
   Func("f", {Param("foo", ty.pointer<f32>(ast::StorageClass::kFunction))},
        ty.f32(), {Return(Deref("foo"))});

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_THAT(gen.result(), HasSubstr(R"(float f(inout float foo) {
   return foo;
 }
 )"));
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_WithInOutVars) {
   // fn frag_main([[location(0)]] foo : f32) -> [[location(1)]] f32 {
   //   return foo;
   // }
   auto* foo_in = Param("foo", ty.f32(), {Location(0)});
   Func("frag_main", ast::VariableList{foo_in}, ty.f32(), {Return("foo")},
        {Stage(ast::PipelineStage::kFragment)}, {Location(1)});

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(struct tint_symbol_1 {
   float foo : TEXCOORD0;
 };
 struct tint_symbol_2 {
   float value : SV_Target1;
 };

 tint_symbol_2 frag_main(tint_symbol_1 tint_symbol) {
   const float foo = tint_symbol.foo;
   const tint_symbol_2 tint_symbol_3 = {foo};
   return tint_symbol_3;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_WithInOut_Builtins) {
   // fn frag_main([[position(0)]] coord : vec4<f32>) -> [[frag_depth]] f32 {
   //   return coord.x;
   // }
   auto* coord_in =
       Param("coord", ty.vec4<f32>(), {Builtin(ast::Builtin::kPosition)});
   Func("frag_main", ast::VariableList{coord_in}, ty.f32(),
        {Return(MemberAccessor("coord", "x"))},
        {Stage(ast::PipelineStage::kFragment)},
        {Builtin(ast::Builtin::kFragDepth)});

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(struct tint_symbol_1 {
   float4 coord : SV_Position;
 };
 struct tint_symbol_2 {
   float value : SV_Depth;
 };

 tint_symbol_2 frag_main(tint_symbol_1 tint_symbol) {
   const float4 coord = tint_symbol.coord;
   const tint_symbol_2 tint_symbol_3 = {coord.x};
   return tint_symbol_3;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_SharedStruct_DifferentStages) {
   // struct Interface {
   //   [[builtin(position)]] pos : vec4<f32>;
   //   [[location(1)]] col1 : f32;
   //   [[location(2)]] col2 : f32;
   // };
   // fn vert_main() -> Interface {
   //   return Interface(vec4<f32>(), 0.4, 0.6);
   // }
   // fn frag_main(inputs : Interface) {
   //   const r = inputs.col1;
   //   const g = inputs.col2;
   //   const p = inputs.pos;
   // }
   auto* interface_struct = Structure(
       "Interface",
       {
           Member("pos", ty.vec4<f32>(), {Builtin(ast::Builtin::kPosition)}),
           Member("col1", ty.f32(), {Location(1)}),
           Member("col2", ty.f32(), {Location(2)}),
       });

   Func("vert_main", {}, ty.Of(interface_struct),
        {Return(Construct(ty.Of(interface_struct), Construct(ty.vec4<f32>()),
                          Expr(0.5f), Expr(0.25f)))},
        {Stage(ast::PipelineStage::kVertex)});

   Func("frag_main", {Param("inputs", ty.Of(interface_struct))}, ty.void_(),
        {
            Decl(Const("r", ty.f32(), MemberAccessor("inputs", "col1"))),
            Decl(Const("g", ty.f32(), MemberAccessor("inputs", "col2"))),
            Decl(Const("p", ty.vec4<f32>(), MemberAccessor("inputs", "pos"))),
        },
        {Stage(ast::PipelineStage::kFragment)});

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(struct Interface {
   float4 pos;
   float col1;
   float col2;
 };
 struct tint_symbol {
   float col1 : TEXCOORD1;
   float col2 : TEXCOORD2;
   float4 pos : SV_Position;
 };

 tint_symbol vert_main() {
   const Interface tint_symbol_1 = {float4(0.0f, 0.0f, 0.0f, 0.0f), 0.5f, 0.25f};
   const tint_symbol tint_symbol_4 = {tint_symbol_1.col1, tint_symbol_1.col2, tint_symbol_1.pos};
   return tint_symbol_4;
 }

 struct tint_symbol_3 {
   float col1 : TEXCOORD1;
   float col2 : TEXCOORD2;
   float4 pos : SV_Position;
 };

 void frag_main(tint_symbol_3 tint_symbol_2) {
   const Interface inputs = {tint_symbol_2.pos, tint_symbol_2.col1, tint_symbol_2.col2};
   const float r = inputs.col1;
   const float g = inputs.col2;
   const float4 p = inputs.pos;
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_SharedStruct_HelperFunction) {
   // struct VertexOutput {
   //   [[builtin(position)]] pos : vec4<f32>;
   // };
   // fn foo(x : f32) -> VertexOutput {
   //   return VertexOutput(vec4<f32>(x, x, x, 1.0));
   // }
   // fn vert_main1() -> VertexOutput {
   //   return foo(0.5);
   // }
   // fn vert_main2() -> VertexOutput {
   //   return foo(0.25);
   // }
   auto* vertex_output_struct = Structure(
       "VertexOutput",
       {Member("pos", ty.vec4<f32>(), {Builtin(ast::Builtin::kPosition)})});

   Func("foo", {Param("x", ty.f32())}, ty.Of(vertex_output_struct),
        {Return(Construct(ty.Of(vertex_output_struct),
                          Construct(ty.vec4<f32>(), "x", "x", "x", Expr(1.f))))},
        {});

   Func("vert_main1", {}, ty.Of(vertex_output_struct),
        {Return(Call("foo", Expr(0.5f)))}, {Stage(ast::PipelineStage::kVertex)});

   Func("vert_main2", {}, ty.Of(vertex_output_struct),
        {Return(Call("foo", Expr(0.25f)))},
        {Stage(ast::PipelineStage::kVertex)});

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(struct VertexOutput {
   float4 pos;
 };

 VertexOutput foo(float x) {
   const VertexOutput tint_symbol_4 = {float4(x, x, x, 1.0f)};
   return tint_symbol_4;
 }

 struct tint_symbol {
   float4 pos : SV_Position;
 };

 tint_symbol vert_main1() {
   const VertexOutput tint_symbol_1 = foo(0.5f);
   const tint_symbol tint_symbol_5 = {tint_symbol_1.pos};
   return tint_symbol_5;
 }

 struct tint_symbol_2 {
   float4 pos : SV_Position;
 };

 tint_symbol_2 vert_main2() {
   const VertexOutput tint_symbol_3 = foo(0.25f);
   const tint_symbol_2 tint_symbol_6 = {tint_symbol_3.pos};
   return tint_symbol_6;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_With_Uniform) {
   auto* ubo_ty = Structure("UBO", {Member("coord", ty.vec4<f32>())},
                            {create<ast::StructBlockDecoration>()});
   auto* ubo = Global("ubo", ty.Of(ubo_ty), ast::StorageClass::kUniform,
                      ast::DecorationList{
                          create<ast::BindingDecoration>(0),
                          create<ast::GroupDecoration>(1),
                      });

   Func("sub_func",
        {
            Param("param", ty.f32()),
        },
        ty.f32(),
        {
            Return(MemberAccessor(MemberAccessor(ubo, "coord"), "x")),
        });

   auto* var =
       Var("v", ty.f32(), ast::StorageClass::kNone, Call("sub_func", 1.0f));

   Func("frag_main", {}, ty.void_(),
        {
            Decl(var),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(cbuffer cbuffer_ubo : register(b0, space1) {
   uint4 ubo[1];
 };

 float sub_func(float param) {
   return ubo.coord.x;
 }

 void frag_main() {
   float v = sub_func(1.0f);
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_With_UniformStruct) {
   auto* s = Structure("Uniforms", {Member("coord", ty.vec4<f32>())},
                       {create<ast::StructBlockDecoration>()});

   Global("uniforms", ty.Of(s), ast::StorageClass::kUniform,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(1),
          });

   auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
                   MemberAccessor(MemberAccessor("uniforms", "coord"), "x"));

   Func("frag_main", ast::VariableList{}, ty.void_(),
        {
            Decl(var),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(cbuffer cbuffer_uniforms : register(b0, space1) {
   uint4 uniforms[1];
 };

 void frag_main() {
   float v = uniforms.coord.x;
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_With_RW_StorageBuffer_Read) {
   auto* s = Structure("Data",
                       {
                           Member("a", ty.i32()),
                           Member("b", ty.f32()),
                       },
                       {create<ast::StructBlockDecoration>()});

   Global("coord", ty.Of(s), ast::StorageClass::kStorage,
          ast::Access::kReadWrite,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(1),
          });

   auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
                   MemberAccessor("coord", "b"));

   Func("frag_main", ast::VariableList{}, ty.void_(),
        {
            Decl(var),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(),
             R"(RWByteAddressBuffer coord : register(u0, space1);

 void frag_main() {
   float v = asfloat(coord.Load(4u));
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_With_RO_StorageBuffer_Read) {
   auto* s = Structure("Data",
                       {
                           Member("a", ty.i32()),
                           Member("b", ty.f32()),
                       },
                       {create<ast::StructBlockDecoration>()});

   Global("coord", ty.Of(s), ast::StorageClass::kStorage, ast::Access::kRead,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(1),
          });

   auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
                   MemberAccessor("coord", "b"));

   Func("frag_main", ast::VariableList{}, ty.void_(),
        {
            Decl(var),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(),
             R"(ByteAddressBuffer coord : register(t0, space1);

 void frag_main() {
   float v = asfloat(coord.Load(4u));
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_With_WO_StorageBuffer_Store) {
   auto* s = Structure("Data",
                       {
                           Member("a", ty.i32()),
                           Member("b", ty.f32()),
                       },
                       {create<ast::StructBlockDecoration>()});

   Global("coord", ty.Of(s), ast::StorageClass::kStorage, ast::Access::kWrite,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(1),
          });

   Func("frag_main", ast::VariableList{}, ty.void_(),
        {
            Assign(MemberAccessor("coord", "b"), Expr(2.0f)),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(),
             R"(RWByteAddressBuffer coord : register(u0, space1);

 void frag_main() {
   coord.Store(4u, asuint(2.0f));
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_With_StorageBuffer_Store) {
   auto* s = Structure("Data",
                       {
                           Member("a", ty.i32()),
                           Member("b", ty.f32()),
                       },
                       {create<ast::StructBlockDecoration>()});

   Global("coord", ty.Of(s), ast::StorageClass::kStorage,
          ast::Access::kReadWrite,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(1),
          });

   Func("frag_main", ast::VariableList{}, ty.void_(),
        {
            Assign(MemberAccessor("coord", "b"), Expr(2.0f)),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(),
             R"(RWByteAddressBuffer coord : register(u0, space1);

 void frag_main() {
   coord.Store(4u, asuint(2.0f));
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_Called_By_EntryPoint_With_Uniform) {
   auto* s = Structure("S", {Member("x", ty.f32())},
                       {create<ast::StructBlockDecoration>()});
   Global("coord", ty.Of(s), ast::StorageClass::kUniform,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(1),
          });

   Func("sub_func", ast::VariableList{Param("param", ty.f32())}, ty.f32(),
        {
            Return(MemberAccessor("coord", "x")),
        });

   auto* var =
       Var("v", ty.f32(), ast::StorageClass::kNone, Call("sub_func", 1.0f));

   Func("frag_main", ast::VariableList{}, ty.void_(),
        {
            Decl(var),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(cbuffer cbuffer_coord : register(b0, space1) {
   uint4 coord[1];
 };

 float sub_func(float param) {
   return coord.x;
 }

 void frag_main() {
   float v = sub_func(1.0f);
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_Called_By_EntryPoint_With_StorageBuffer) {
   auto* s = Structure("S", {Member("x", ty.f32())},
                       {create<ast::StructBlockDecoration>()});
   Global("coord", ty.Of(s), ast::StorageClass::kStorage,
          ast::Access::kReadWrite,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(1),
          });

   Func("sub_func", ast::VariableList{Param("param", ty.f32())}, ty.f32(),
        {
            Return(MemberAccessor("coord", "x")),
        });

   auto* var =
       Var("v", ty.f32(), ast::StorageClass::kNone, Call("sub_func", 1.0f));

   Func("frag_main", ast::VariableList{}, ty.void_(),
        {
            Decl(var),
            Return(),
        },
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(),
             R"(RWByteAddressBuffer coord : register(u0, space1);

 float sub_func(float param) {
   return asfloat(coord.Load(0u));
 }

 void frag_main() {
   float v = sub_func(1.0f);
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_WithNameCollision) {
   Func("GeometryShader", ast::VariableList{}, ty.void_(), {},
        {
            Stage(ast::PipelineStage::kFragment),
        });

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(void tint_symbol() {
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function, Emit_Decoration_EntryPoint_Compute) {
   Func("main", ast::VariableList{}, ty.void_(),
        {
            Return(),
        },
        {Stage(ast::PipelineStage::kCompute), WorkgroupSize(1)});

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"([numthreads(1, 1, 1)]
 void main() {
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_Compute_WithWorkgroup_Literal) {
   Func("main", ast::VariableList{}, ty.void_(), {},
        {
            Stage(ast::PipelineStage::kCompute),
            WorkgroupSize(2, 4, 6),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"([numthreads(2, 4, 6)]
 void main() {
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_Compute_WithWorkgroup_Const) {
   GlobalConst("width", ty.i32(), Construct(ty.i32(), 2));
   GlobalConst("height", ty.i32(), Construct(ty.i32(), 3));
   GlobalConst("depth", ty.i32(), Construct(ty.i32(), 4));
   Func("main", ast::VariableList{}, ty.void_(), {},
        {
            Stage(ast::PipelineStage::kCompute),
            WorkgroupSize("width", "height", "depth"),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(static const int width = int(2);
 static const int height = int(3);
 static const int depth = int(4);

 [numthreads(2, 3, 4)]
 void main() {
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Decoration_EntryPoint_Compute_WithWorkgroup_OverridableConst) {
   GlobalConst("width", ty.i32(), Construct(ty.i32(), 2), {Override(7u)});
   GlobalConst("height", ty.i32(), Construct(ty.i32(), 3), {Override(8u)});
   GlobalConst("depth", ty.i32(), Construct(ty.i32(), 4), {Override(9u)});
   Func("main", ast::VariableList{}, ty.void_(), {},
        {
            Stage(ast::PipelineStage::kCompute),
            WorkgroupSize("width", "height", "depth"),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(#ifndef WGSL_SPEC_CONSTANT_7
 #define WGSL_SPEC_CONSTANT_7 int(2)
 #endif
 static const int width = WGSL_SPEC_CONSTANT_7;
 #ifndef WGSL_SPEC_CONSTANT_8
 #define WGSL_SPEC_CONSTANT_8 int(3)
 #endif
 static const int height = WGSL_SPEC_CONSTANT_8;
 #ifndef WGSL_SPEC_CONSTANT_9
 #define WGSL_SPEC_CONSTANT_9 int(4)
 #endif
 static const int depth = WGSL_SPEC_CONSTANT_9;

 [numthreads(WGSL_SPEC_CONSTANT_7, WGSL_SPEC_CONSTANT_8, WGSL_SPEC_CONSTANT_9)]
 void main() {
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithArrayParams) {
   Func("my_func", ast::VariableList{Param("a", ty.array<f32, 5>())}, ty.void_(),
        {
            Return(),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(void my_func(float a[5]) {
   return;
 }
 )");
 }

 TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithArrayReturn) {
   Func("my_func", {}, ty.array<f32, 5>(),
        {
            Return(Construct(ty.array<f32, 5>())),
        });

   GeneratorImpl& gen = Build();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(typedef float my_func_ret[5];
 my_func_ret my_func() {
   return (float[5])0;
 }
 )");
 }

 // https://crbug.com/tint/297
 TEST_F(HlslGeneratorImplTest_Function,
        Emit_Multiple_EntryPoint_With_Same_ModuleVar) {
   // [[block]] struct Data {
   //   d : f32;
   // };
   // [[binding(0), group(0)]] var<storage> data : Data;
   //
   // [[stage(compute), workgroup_size(1)]]
   // fn a() {
   //   var v = data.d;
   //   return;
   // }
   //
   // [[stage(compute), workgroup_size(1)]]
   // fn b() {
   //   var v = data.d;
   //   return;
   // }

   auto* s = Structure("Data", {Member("d", ty.f32())},
                       {create<ast::StructBlockDecoration>()});

   Global("data", ty.Of(s), ast::StorageClass::kStorage, ast::Access::kReadWrite,
          ast::DecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::GroupDecoration>(0),
          });

   {
     auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
                     MemberAccessor("data", "d"));

     Func("a", ast::VariableList{}, ty.void_(),
          {
              Decl(var),
              Return(),
          },
          {Stage(ast::PipelineStage::kCompute), WorkgroupSize(1)});
   }

   {
     auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
                     MemberAccessor("data", "d"));

     Func("b", ast::VariableList{}, ty.void_(),
          {
              Decl(var),
              Return(),
          },
          {Stage(ast::PipelineStage::kCompute), WorkgroupSize(1)});
   }

   GeneratorImpl& gen = SanitizeAndBuild();

   ASSERT_TRUE(gen.Generate()) << gen.error();
   EXPECT_EQ(gen.result(), R"(RWByteAddressBuffer data : register(u0, space0);

 [numthreads(1, 1, 1)]
 void a() {
   float v = asfloat(data.Load(0u));
   return;
 }

 [numthreads(1, 1, 1)]
 void b() {
   float v = asfloat(data.Load(0u));
   return;
 }
 )");
 }

 }  // namespace
 }  // namespace hlsl
 }  // namespace writer
 }  // namespace tint
	// Copyright 2020 The Tint Authors.
	//
	// 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 "gmock/gmock.h"
	#include "src/ast/stage_decoration.h"
	#include "src/ast/struct_block_decoration.h"
	#include "src/ast/variable_decl_statement.h"
	#include "src/ast/workgroup_decoration.h"
	#include "src/writer/hlsl/test_helper.h"

	using ::testing::HasSubstr;

	namespace tint {
	namespace writer {
	namespace hlsl {
	namespace {

	using HlslGeneratorImplTest_Function = TestHelper;

	TEST_F(HlslGeneratorImplTest_Function, Emit_Function) {
	Func("my_func", ast::VariableList{}, ty.void_(),
	{
	Return(),
	});

	GeneratorImpl& gen = Build();

	gen.increment_indent();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"( void my_func() {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function, Emit_Function_Name_Collision) {
	Func("GeometryShader", ast::VariableList{}, ty.void_(),
	{
	Return(),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	gen.increment_indent();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_THAT(gen.result(), HasSubstr(R"( void tint_symbol() {
	return;
	})"));
	}

	TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithParams) {
	Func("my_func", ast::VariableList{Param("a", ty.f32()), Param("b", ty.i32())},
	ty.void_(),
	{
	Return(),
	});

	GeneratorImpl& gen = Build();

	gen.increment_indent();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"( void my_func(float a, int b) {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_NoReturn_Void) {
	Func("main", ast::VariableList{}, ty.void_(), {/* no explicit return */},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(void main() {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function, PtrParameter) {
	// fn f(foo : ptr<function, f32>) -> f32 {
	// return *foo;
	// }
	Func("f", {Param("foo", ty.pointer<f32>(ast::StorageClass::kFunction))},
	ty.f32(), {Return(Deref("foo"))});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_THAT(gen.result(), HasSubstr(R"(float f(inout float foo) {
	return foo;
	}
	)"));
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_WithInOutVars) {
	// fn frag_main([[location(0)]] foo : f32) -> [[location(1)]] f32 {
	// return foo;
	// }
	auto* foo_in = Param("foo", ty.f32(), {Location(0)});
	Func("frag_main", ast::VariableList{foo_in}, ty.f32(), {Return("foo")},
	{Stage(ast::PipelineStage::kFragment)}, {Location(1)});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(struct tint_symbol_1 {
	float foo : TEXCOORD0;
	};
	struct tint_symbol_2 {
	float value : SV_Target1;
	};

	tint_symbol_2 frag_main(tint_symbol_1 tint_symbol) {
	const float foo = tint_symbol.foo;
	const tint_symbol_2 tint_symbol_3 = {foo};
	return tint_symbol_3;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_WithInOut_Builtins) {
	// fn frag_main([[position(0)]] coord : vec4<f32>) -> [[frag_depth]] f32 {
	// return coord.x;
	// }
	auto* coord_in =
	Param("coord", ty.vec4<f32>(), {Builtin(ast::Builtin::kPosition)});
	Func("frag_main", ast::VariableList{coord_in}, ty.f32(),
	{Return(MemberAccessor("coord", "x"))},
	{Stage(ast::PipelineStage::kFragment)},
	{Builtin(ast::Builtin::kFragDepth)});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(struct tint_symbol_1 {
	float4 coord : SV_Position;
	};
	struct tint_symbol_2 {
	float value : SV_Depth;
	};

	tint_symbol_2 frag_main(tint_symbol_1 tint_symbol) {
	const float4 coord = tint_symbol.coord;
	const tint_symbol_2 tint_symbol_3 = {coord.x};
	return tint_symbol_3;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_SharedStruct_DifferentStages) {
	// struct Interface {
	// [[builtin(position)]] pos : vec4<f32>;
	// [[location(1)]] col1 : f32;
	// [[location(2)]] col2 : f32;
	// };
	// fn vert_main() -> Interface {
	// return Interface(vec4<f32>(), 0.4, 0.6);
	// }
	// fn frag_main(inputs : Interface) {
	// const r = inputs.col1;
	// const g = inputs.col2;
	// const p = inputs.pos;
	// }
	auto* interface_struct = Structure(
	"Interface",
	{
	Member("pos", ty.vec4<f32>(), {Builtin(ast::Builtin::kPosition)}),
	Member("col1", ty.f32(), {Location(1)}),
	Member("col2", ty.f32(), {Location(2)}),
	});

	Func("vert_main", {}, ty.Of(interface_struct),
	{Return(Construct(ty.Of(interface_struct), Construct(ty.vec4<f32>()),
	Expr(0.5f), Expr(0.25f)))},
	{Stage(ast::PipelineStage::kVertex)});

	Func("frag_main", {Param("inputs", ty.Of(interface_struct))}, ty.void_(),
	{
	Decl(Const("r", ty.f32(), MemberAccessor("inputs", "col1"))),
	Decl(Const("g", ty.f32(), MemberAccessor("inputs", "col2"))),
	Decl(Const("p", ty.vec4<f32>(), MemberAccessor("inputs", "pos"))),
	},
	{Stage(ast::PipelineStage::kFragment)});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(struct Interface {
	float4 pos;
	float col1;
	float col2;
	};
	struct tint_symbol {
	float col1 : TEXCOORD1;
	float col2 : TEXCOORD2;
	float4 pos : SV_Position;
	};

	tint_symbol vert_main() {
	const Interface tint_symbol_1 = {float4(0.0f, 0.0f, 0.0f, 0.0f), 0.5f, 0.25f};
	const tint_symbol tint_symbol_4 = {tint_symbol_1.col1, tint_symbol_1.col2, tint_symbol_1.pos};
	return tint_symbol_4;
	}

	struct tint_symbol_3 {
	float col1 : TEXCOORD1;
	float col2 : TEXCOORD2;
	float4 pos : SV_Position;
	};

	void frag_main(tint_symbol_3 tint_symbol_2) {
	const Interface inputs = {tint_symbol_2.pos, tint_symbol_2.col1, tint_symbol_2.col2};
	const float r = inputs.col1;
	const float g = inputs.col2;
	const float4 p = inputs.pos;
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_SharedStruct_HelperFunction) {
	// struct VertexOutput {
	// [[builtin(position)]] pos : vec4<f32>;
	// };
	// fn foo(x : f32) -> VertexOutput {
	// return VertexOutput(vec4<f32>(x, x, x, 1.0));
	// }
	// fn vert_main1() -> VertexOutput {
	// return foo(0.5);
	// }
	// fn vert_main2() -> VertexOutput {
	// return foo(0.25);
	// }
	auto* vertex_output_struct = Structure(
	"VertexOutput",
	{Member("pos", ty.vec4<f32>(), {Builtin(ast::Builtin::kPosition)})});

	Func("foo", {Param("x", ty.f32())}, ty.Of(vertex_output_struct),
	{Return(Construct(ty.Of(vertex_output_struct),
	Construct(ty.vec4<f32>(), "x", "x", "x", Expr(1.f))))},
	{});

	Func("vert_main1", {}, ty.Of(vertex_output_struct),
	{Return(Call("foo", Expr(0.5f)))}, {Stage(ast::PipelineStage::kVertex)});

	Func("vert_main2", {}, ty.Of(vertex_output_struct),
	{Return(Call("foo", Expr(0.25f)))},
	{Stage(ast::PipelineStage::kVertex)});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(struct VertexOutput {
	float4 pos;
	};

	VertexOutput foo(float x) {
	const VertexOutput tint_symbol_4 = {float4(x, x, x, 1.0f)};
	return tint_symbol_4;
	}

	struct tint_symbol {
	float4 pos : SV_Position;
	};

	tint_symbol vert_main1() {
	const VertexOutput tint_symbol_1 = foo(0.5f);
	const tint_symbol tint_symbol_5 = {tint_symbol_1.pos};
	return tint_symbol_5;
	}

	struct tint_symbol_2 {
	float4 pos : SV_Position;
	};

	tint_symbol_2 vert_main2() {
	const VertexOutput tint_symbol_3 = foo(0.25f);
	const tint_symbol_2 tint_symbol_6 = {tint_symbol_3.pos};
	return tint_symbol_6;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_With_Uniform) {
	auto* ubo_ty = Structure("UBO", {Member("coord", ty.vec4<f32>())},
	{create<ast::StructBlockDecoration>()});
	auto* ubo = Global("ubo", ty.Of(ubo_ty), ast::StorageClass::kUniform,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	Func("sub_func",
	{
	Param("param", ty.f32()),
	},
	ty.f32(),
	{
	Return(MemberAccessor(MemberAccessor(ubo, "coord"), "x")),
	});

	auto* var =
	Var("v", ty.f32(), ast::StorageClass::kNone, Call("sub_func", 1.0f));

	Func("frag_main", {}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(cbuffer cbuffer_ubo : register(b0, space1) {
	uint4 ubo[1];
	};

	float sub_func(float param) {
	return ubo.coord.x;
	}

	void frag_main() {
	float v = sub_func(1.0f);
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_With_UniformStruct) {
	auto* s = Structure("Uniforms", {Member("coord", ty.vec4<f32>())},
	{create<ast::StructBlockDecoration>()});

	Global("uniforms", ty.Of(s), ast::StorageClass::kUniform,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
	MemberAccessor(MemberAccessor("uniforms", "coord"), "x"));

	Func("frag_main", ast::VariableList{}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(cbuffer cbuffer_uniforms : register(b0, space1) {
	uint4 uniforms[1];
	};

	void frag_main() {
	float v = uniforms.coord.x;
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_With_RW_StorageBuffer_Read) {
	auto* s = Structure("Data",
	{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	},
	{create<ast::StructBlockDecoration>()});

	Global("coord", ty.Of(s), ast::StorageClass::kStorage,
	ast::Access::kReadWrite,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
	MemberAccessor("coord", "b"));

	Func("frag_main", ast::VariableList{}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(),
	R"(RWByteAddressBuffer coord : register(u0, space1);

	void frag_main() {
	float v = asfloat(coord.Load(4u));
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_With_RO_StorageBuffer_Read) {
	auto* s = Structure("Data",
	{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	},
	{create<ast::StructBlockDecoration>()});

	Global("coord", ty.Of(s), ast::StorageClass::kStorage, ast::Access::kRead,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
	MemberAccessor("coord", "b"));

	Func("frag_main", ast::VariableList{}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(),
	R"(ByteAddressBuffer coord : register(t0, space1);

	void frag_main() {
	float v = asfloat(coord.Load(4u));
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_With_WO_StorageBuffer_Store) {
	auto* s = Structure("Data",
	{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	},
	{create<ast::StructBlockDecoration>()});

	Global("coord", ty.Of(s), ast::StorageClass::kStorage, ast::Access::kWrite,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	Func("frag_main", ast::VariableList{}, ty.void_(),
	{
	Assign(MemberAccessor("coord", "b"), Expr(2.0f)),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(),
	R"(RWByteAddressBuffer coord : register(u0, space1);

	void frag_main() {
	coord.Store(4u, asuint(2.0f));
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_With_StorageBuffer_Store) {
	auto* s = Structure("Data",
	{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	},
	{create<ast::StructBlockDecoration>()});

	Global("coord", ty.Of(s), ast::StorageClass::kStorage,
	ast::Access::kReadWrite,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	Func("frag_main", ast::VariableList{}, ty.void_(),
	{
	Assign(MemberAccessor("coord", "b"), Expr(2.0f)),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(),
	R"(RWByteAddressBuffer coord : register(u0, space1);

	void frag_main() {
	coord.Store(4u, asuint(2.0f));
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_Called_By_EntryPoint_With_Uniform) {
	auto* s = Structure("S", {Member("x", ty.f32())},
	{create<ast::StructBlockDecoration>()});
	Global("coord", ty.Of(s), ast::StorageClass::kUniform,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	Func("sub_func", ast::VariableList{Param("param", ty.f32())}, ty.f32(),
	{
	Return(MemberAccessor("coord", "x")),
	});

	auto* var =
	Var("v", ty.f32(), ast::StorageClass::kNone, Call("sub_func", 1.0f));

	Func("frag_main", ast::VariableList{}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(cbuffer cbuffer_coord : register(b0, space1) {
	uint4 coord[1];
	};

	float sub_func(float param) {
	return coord.x;
	}

	void frag_main() {
	float v = sub_func(1.0f);
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_Called_By_EntryPoint_With_StorageBuffer) {
	auto* s = Structure("S", {Member("x", ty.f32())},
	{create<ast::StructBlockDecoration>()});
	Global("coord", ty.Of(s), ast::StorageClass::kStorage,
	ast::Access::kReadWrite,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(1),
	});

	Func("sub_func", ast::VariableList{Param("param", ty.f32())}, ty.f32(),
	{
	Return(MemberAccessor("coord", "x")),
	});

	auto* var =
	Var("v", ty.f32(), ast::StorageClass::kNone, Call("sub_func", 1.0f));

	Func("frag_main", ast::VariableList{}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(),
	R"(RWByteAddressBuffer coord : register(u0, space1);

	float sub_func(float param) {
	return asfloat(coord.Load(0u));
	}

	void frag_main() {
	float v = sub_func(1.0f);
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_WithNameCollision) {
	Func("GeometryShader", ast::VariableList{}, ty.void_(), {},
	{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(void tint_symbol() {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function, Emit_Decoration_EntryPoint_Compute) {
	Func("main", ast::VariableList{}, ty.void_(),
	{
	Return(),
	},
	{Stage(ast::PipelineStage::kCompute), WorkgroupSize(1)});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"([numthreads(1, 1, 1)]
	void main() {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_Compute_WithWorkgroup_Literal) {
	Func("main", ast::VariableList{}, ty.void_(), {},
	{
	Stage(ast::PipelineStage::kCompute),
	WorkgroupSize(2, 4, 6),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"([numthreads(2, 4, 6)]
	void main() {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_Compute_WithWorkgroup_Const) {
	GlobalConst("width", ty.i32(), Construct(ty.i32(), 2));
	GlobalConst("height", ty.i32(), Construct(ty.i32(), 3));
	GlobalConst("depth", ty.i32(), Construct(ty.i32(), 4));
	Func("main", ast::VariableList{}, ty.void_(), {},
	{
	Stage(ast::PipelineStage::kCompute),
	WorkgroupSize("width", "height", "depth"),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(static const int width = int(2);
	static const int height = int(3);
	static const int depth = int(4);

	[numthreads(2, 3, 4)]
	void main() {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Decoration_EntryPoint_Compute_WithWorkgroup_OverridableConst) {
	GlobalConst("width", ty.i32(), Construct(ty.i32(), 2), {Override(7u)});
	GlobalConst("height", ty.i32(), Construct(ty.i32(), 3), {Override(8u)});
	GlobalConst("depth", ty.i32(), Construct(ty.i32(), 4), {Override(9u)});
	Func("main", ast::VariableList{}, ty.void_(), {},
	{
	Stage(ast::PipelineStage::kCompute),
	WorkgroupSize("width", "height", "depth"),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#ifndef WGSL_SPEC_CONSTANT_7
	#define WGSL_SPEC_CONSTANT_7 int(2)
	#endif
	static const int width = WGSL_SPEC_CONSTANT_7;
	#ifndef WGSL_SPEC_CONSTANT_8
	#define WGSL_SPEC_CONSTANT_8 int(3)
	#endif
	static const int height = WGSL_SPEC_CONSTANT_8;
	#ifndef WGSL_SPEC_CONSTANT_9
	#define WGSL_SPEC_CONSTANT_9 int(4)
	#endif
	static const int depth = WGSL_SPEC_CONSTANT_9;

	[numthreads(WGSL_SPEC_CONSTANT_7, WGSL_SPEC_CONSTANT_8, WGSL_SPEC_CONSTANT_9)]
	void main() {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithArrayParams) {
	Func("my_func", ast::VariableList{Param("a", ty.array<f32, 5>())}, ty.void_(),
	{
	Return(),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(void my_func(float a[5]) {
	return;
	}
	)");
	}

	TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithArrayReturn) {
	Func("my_func", {}, ty.array<f32, 5>(),
	{
	Return(Construct(ty.array<f32, 5>())),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(typedef float my_func_ret[5];
	my_func_ret my_func() {
	return (float[5])0;
	}
	)");
	}

	// https://crbug.com/tint/297
	TEST_F(HlslGeneratorImplTest_Function,
	Emit_Multiple_EntryPoint_With_Same_ModuleVar) {
	// [[block]] struct Data {
	// d : f32;
	// };
	// [[binding(0), group(0)]] var<storage> data : Data;
	//
	// [[stage(compute), workgroup_size(1)]]
	// fn a() {
	// var v = data.d;
	// return;
	// }
	//
	// [[stage(compute), workgroup_size(1)]]
	// fn b() {
	// var v = data.d;
	// return;
	// }

	auto* s = Structure("Data", {Member("d", ty.f32())},
	{create<ast::StructBlockDecoration>()});

	Global("data", ty.Of(s), ast::StorageClass::kStorage, ast::Access::kReadWrite,
	ast::DecorationList{
	create<ast::BindingDecoration>(0),
	create<ast::GroupDecoration>(0),
	});

	{
	auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
	MemberAccessor("data", "d"));

	Func("a", ast::VariableList{}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{Stage(ast::PipelineStage::kCompute), WorkgroupSize(1)});
	}

	{
	auto* var = Var("v", ty.f32(), ast::StorageClass::kNone,
	MemberAccessor("data", "d"));

	Func("b", ast::VariableList{}, ty.void_(),
	{
	Decl(var),
	Return(),
	},
	{Stage(ast::PipelineStage::kCompute), WorkgroupSize(1)});
	}

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(RWByteAddressBuffer data : register(u0, space0);

	[numthreads(1, 1, 1)]
	void a() {
	float v = asfloat(data.Load(0u));
	return;
	}

	[numthreads(1, 1, 1)]
	void b() {
	float v = asfloat(data.Load(0u));
	return;
	}
	)");
	}

	} // namespace
	} // namespace hlsl
	} // namespace writer
	} // namespace tint