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

 // Copyright 2021 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/tint/ast/stage_attribute.h"
 #include "src/tint/ast/variable_decl_statement.h"
 #include "src/tint/ast/workgroup_attribute.h"
 #include "src/tint/writer/glsl/test_helper.h"

 using ::testing::HasSubstr;

 using namespace tint::number_suffixes;  // NOLINT

 namespace tint::writer::glsl {
 namespace {

 using GlslGeneratorImplTest_Function = TestHelper;

 TEST_F(GlslGeneratorImplTest_Function, Emit_Function) {
     Func("my_func", utils::Empty, ty.void_(),
          utils::Vector{
              Return(),
          });

     GeneratorImpl& gen = Build();

     gen.increment_indent();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(  #version 310 es

   void my_func() {
     return;
   }

 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Function_Name_Collision) {
     Func("centroid", utils::Empty, ty.void_(),
          utils::Vector{
              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(GlslGeneratorImplTest_Function, Emit_Function_WithParams) {
     Func("my_func",
          utils::Vector{
              Param("a", ty.f32()),
              Param("b", ty.i32()),
          },
          ty.void_(),
          utils::Vector{
              Return(),
          });

     GeneratorImpl& gen = Build();

     gen.increment_indent();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(  #version 310 es

   void my_func(float a, int b) {
     return;
   }

 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_NoReturn_Void) {
     Func("func", utils::Empty, ty.void_(), utils::Empty /* no explicit return */,
          utils::Vector{
              Stage(ast::PipelineStage::kFragment),
          });

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 void func() {
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, PtrParameter) {
     // fn f(foo : ptr<function, f32>) -> f32 {
     //   return *foo;
     // }
     Func("f", utils::Vector{Param("foo", ty.pointer<f32>(ast::AddressSpace::kFunction))}, ty.f32(),
          utils::Vector{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(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_WithInOutVars) {
     // fn frag_main(@location(0) foo : f32) -> @location(1) f32 {
     //   return foo;
     // }
     Func("frag_main",
          utils::Vector{
              Param("foo", ty.f32(), utils::Vector{Location(0_a)}),
          },
          ty.f32(),
          utils::Vector{
              Return("foo"),
          },
          utils::Vector{
              Stage(ast::PipelineStage::kFragment),
          },
          utils::Vector{
              Location(1_a),
          });

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 layout(location = 0) in float foo_1;
 layout(location = 1) out float value;
 float frag_main(float foo) {
   return foo;
 }

 void main() {
   float inner_result = frag_main(foo_1);
   value = inner_result;
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_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>(), utils::Vector{Builtin(ast::BuiltinValue::kPosition)});
     Func("frag_main",
          utils::Vector{
              coord_in,
          },
          ty.f32(),
          utils::Vector{
              Return(MemberAccessor("coord", "x")),
          },
          utils::Vector{
              Stage(ast::PipelineStage::kFragment),
          },
          utils::Vector{
              Builtin(ast::BuiltinValue::kFragDepth),
          });

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 float frag_main(vec4 coord) {
   return coord.x;
 }

 void main() {
   float inner_result = frag_main(gl_FragCoord);
   gl_FragDepth = inner_result;
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_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",
         utils::Vector{
             Member("pos", ty.vec4<f32>(), utils::Vector{Builtin(ast::BuiltinValue::kPosition)}),
             Member("col1", ty.f32(), utils::Vector{Location(1_a)}),
             Member("col2", ty.f32(), utils::Vector{Location(2_a)}),
         });

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

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

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 layout(location = 1) out float col1_1;
 layout(location = 2) out float col2_1;
 layout(location = 1) in float col1_2;
 layout(location = 2) in float col2_2;
 struct Interface {
   vec4 pos;
   float col1;
   float col2;
 };

 Interface vert_main() {
   Interface tint_symbol = Interface(vec4(0.0f), 0.5f, 0.25f);
   return tint_symbol;
 }

 void main() {
   gl_PointSize = 1.0;
   Interface inner_result = vert_main();
   gl_Position = inner_result.pos;
   col1_1 = inner_result.col1;
   col2_1 = inner_result.col2;
   gl_Position.y = -(gl_Position.y);
   gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
   return;
 }
 void frag_main(Interface inputs) {
   float r = inputs.col1;
   float g = inputs.col2;
   vec4 p = inputs.pos;
 }

 void main_1() {
   Interface tint_symbol_1 = Interface(gl_FragCoord, col1_2, col2_2);
   frag_main(tint_symbol_1);
   return;
 }
 )");
 }

 #if 0
 TEST_F(GlslGeneratorImplTest_Function,
        Emit_Attribute_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::BuiltinValue::kPosition)})});

   Func("foo", utils::Vector{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", utils::Empty, ty.Of(vertex_output_struct),
        {Return(Construct(ty.Of(vertex_output_struct),
                          Expr(Call("foo", Expr(0.5_f)))))},
        {Stage(ast::PipelineStage::kVertex)});

   Func("vert_main2", utils::Empty, ty.Of(vertex_output_struct),
        {Return(Construct(ty.Of(vertex_output_struct),
                          Expr(Call("foo", Expr(0.25_f)))))},
        {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;
 }
 )");
 }
 #endif

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_Uniform) {
     auto* ubo_ty = Structure("UBO", utils::Vector{Member("coord", ty.vec4<f32>())});
     auto* ubo =
         GlobalVar("ubo", ty.Of(ubo_ty), ast::AddressSpace::kUniform, Binding(0_a), Group(1_a));

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

     auto* var = Var("v", ty.f32(), Call("sub_func", 1_f));

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

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 struct UBO {
   vec4 coord;
 };

 layout(binding = 0, std140) uniform UBO_ubo {
   vec4 coord;
 } ubo;

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

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

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_UniformStruct) {
     auto* s = Structure("Uniforms", utils::Vector{Member("coord", ty.vec4<f32>())});

     GlobalVar("uniforms", ty.Of(s), ast::AddressSpace::kUniform, Binding(0_a), Group(1_a));

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

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

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 struct Uniforms {
   vec4 coord;
 };

 layout(binding = 0, std140) uniform Uniforms_ubo {
   vec4 coord;
 } uniforms;

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

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_RW_StorageBuffer_Read) {
     auto* s = Structure("Data", utils::Vector{
                                     Member("a", ty.i32()),
                                     Member("b", ty.f32()),
                                 });

     GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
               Group(1_a));

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

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

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 struct Data {
   int a;
   float b;
 };

 layout(binding = 0, std430) buffer coord_block_ssbo {
   Data inner;
 } coord;

 void frag_main() {
   float v = coord.inner.b;
   return;
 }

 void main() {
   frag_main();
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_RO_StorageBuffer_Read) {
     auto* s = Structure("Data", utils::Vector{
                                     Member("a", ty.i32()),
                                     Member("b", ty.f32()),
                                 });

     GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kRead, Binding(0_a),
               Group(1_a));

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

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

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(),
               R"(#version 310 es
 precision mediump float;

 struct Data {
   int a;
   float b;
 };

 layout(binding = 0, std430) buffer coord_block_ssbo {
   Data inner;
 } coord;

 void frag_main() {
   float v = coord.inner.b;
   return;
 }

 void main() {
   frag_main();
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_WO_StorageBuffer_Store) {
     auto* s = Structure("Data", utils::Vector{
                                     Member("a", ty.i32()),
                                     Member("b", ty.f32()),
                                 });

     GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
               Group(1_a));

     Func("frag_main", utils::Empty, ty.void_(),
          utils::Vector{
              Assign(MemberAccessor("coord", "b"), Expr(2_f)),
              Return(),
          },
          utils::Vector{
              Stage(ast::PipelineStage::kFragment),
          });

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 struct Data {
   int a;
   float b;
 };

 layout(binding = 0, std430) buffer coord_block_ssbo {
   Data inner;
 } coord;

 void frag_main() {
   coord.inner.b = 2.0f;
   return;
 }

 void main() {
   frag_main();
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_StorageBuffer_Store) {
     auto* s = Structure("Data", utils::Vector{
                                     Member("a", ty.i32()),
                                     Member("b", ty.f32()),
                                 });

     GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
               Group(1_a));

     Func("frag_main", utils::Empty, ty.void_(),
          utils::Vector{
              Assign(MemberAccessor("coord", "b"), Expr(2_f)),
              Return(),
          },
          utils::Vector{
              Stage(ast::PipelineStage::kFragment),
          });

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 struct Data {
   int a;
   float b;
 };

 layout(binding = 0, std430) buffer coord_block_ssbo {
   Data inner;
 } coord;

 void frag_main() {
   coord.inner.b = 2.0f;
   return;
 }

 void main() {
   frag_main();
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_Called_By_EntryPoint_With_Uniform) {
     auto* s = Structure("S", utils::Vector{Member("x", ty.f32())});
     GlobalVar("coord", ty.Of(s), ast::AddressSpace::kUniform, Binding(0_a), Group(1_a));

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

     auto* var = Var("v", ty.f32(), Call("sub_func", 1_f));

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

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 struct S {
   float x;
 };

 layout(binding = 0, std140) uniform S_ubo {
   float x;
 } coord;

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

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

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_Called_By_EntryPoint_With_StorageBuffer) {
     auto* s = Structure("S", utils::Vector{Member("x", ty.f32())});
     GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
               Group(1_a));

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

     auto* var = Var("v", ty.f32(), Call("sub_func", 1_f));

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

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(),
               R"(#version 310 es
 precision mediump float;

 struct S {
   float x;
 };

 layout(binding = 0, std430) buffer coord_block_ssbo {
   S inner;
 } coord;

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

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

 void main() {
   frag_main();
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_WithNameCollision) {
     Func("centroid", utils::Empty, ty.void_(), {},
          utils::Vector{
              Stage(ast::PipelineStage::kFragment),
          });

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es
 precision mediump float;

 void tint_symbol() {
 }

 void main() {
   tint_symbol();
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_Compute) {
     Func("main", utils::Empty, ty.void_(),
          utils::Vector{
              Return(),
          },
          utils::Vector{
              Stage(ast::PipelineStage::kCompute),
              WorkgroupSize(1_i),
          });

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es

 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
 void main() {
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_Compute_WithWorkgroup_Literal) {
     Func("main", utils::Empty, ty.void_(), {},
          utils::Vector{
              Stage(ast::PipelineStage::kCompute),
              WorkgroupSize(2_i, 4_i, 6_i),
          });

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es

 layout(local_size_x = 2, local_size_y = 4, local_size_z = 6) in;
 void main() {
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_Compute_WithWorkgroup_Const) {
     GlobalConst("width", ty.i32(), Construct(ty.i32(), 2_i));
     GlobalConst("height", ty.i32(), Construct(ty.i32(), 3_i));
     GlobalConst("depth", ty.i32(), Construct(ty.i32(), 4_i));
     Func("main", utils::Empty, ty.void_(), {},
          utils::Vector{
              Stage(ast::PipelineStage::kCompute),
              WorkgroupSize("width", "height", "depth"),
          });

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es

 layout(local_size_x = 2, local_size_y = 3, local_size_z = 4) in;
 void main() {
   return;
 }
 )");
 }

 TEST_F(GlslGeneratorImplTest_Function,
        Emit_Attribute_EntryPoint_Compute_WithWorkgroup_OverridableConst) {
     Override("width", ty.i32(), Construct(ty.i32(), 2_i), Id(7_u));
     Override("height", ty.i32(), Construct(ty.i32(), 3_i), Id(8_u));
     Override("depth", ty.i32(), Construct(ty.i32(), 4_i), Id(9_u));
     Func("main", utils::Empty, ty.void_(), {},
          utils::Vector{
              Stage(ast::PipelineStage::kCompute),
              WorkgroupSize("width", "height", "depth"),
          });

     GeneratorImpl& gen = Build();

     EXPECT_FALSE(gen.Generate()) << gen.error();
     EXPECT_EQ(
         gen.error(),
         R"(error: override-expressions should have been removed with the SubstituteOverride transform)");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Function_WithArrayParams) {
     Func("my_func", utils::Vector{Param("a", ty.array<f32, 5>())}, ty.void_(),
          utils::Vector{
              Return(),
          });

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es

 void my_func(float a[5]) {
   return;
 }

 )");
 }

 TEST_F(GlslGeneratorImplTest_Function, Emit_Function_WithArrayReturn) {
     Func("my_func", utils::Empty, ty.array<f32, 5>(),
          utils::Vector{
              Return(Construct(ty.array<f32, 5>())),
          });

     GeneratorImpl& gen = Build();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es

 float[5] my_func() {
   return float[5](0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
 }

 )");
 }

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

     auto* s = Structure("Data", utils::Vector{Member("d", ty.f32())});

     GlobalVar("data", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
               Group(0_a));

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

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

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

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

     GeneratorImpl& gen = SanitizeAndBuild();

     ASSERT_TRUE(gen.Generate()) << gen.error();
     EXPECT_EQ(gen.result(), R"(#version 310 es

 struct Data {
   float d;
 };

 layout(binding = 0, std430) buffer data_block_ssbo {
   Data inner;
 } data;

 void a() {
   float v = data.inner.d;
   return;
 }

 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
 void main() {
   a();
   return;
 }
 void b() {
   float v = data.inner.d;
   return;
 }

 layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
 void main_1() {
   b();
   return;
 }
 )");
 }

 }  // namespace
 }  // namespace tint::writer::glsl
	// Copyright 2021 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/tint/ast/stage_attribute.h"
	#include "src/tint/ast/variable_decl_statement.h"
	#include "src/tint/ast/workgroup_attribute.h"
	#include "src/tint/writer/glsl/test_helper.h"

	using ::testing::HasSubstr;

	using namespace tint::number_suffixes; // NOLINT

	namespace tint::writer::glsl {
	namespace {

	using GlslGeneratorImplTest_Function = TestHelper;

	TEST_F(GlslGeneratorImplTest_Function, Emit_Function) {
	Func("my_func", utils::Empty, ty.void_(),
	utils::Vector{
	Return(),
	});

	GeneratorImpl& gen = Build();

	gen.increment_indent();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"( #version 310 es

	void my_func() {
	return;
	}

	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Function_Name_Collision) {
	Func("centroid", utils::Empty, ty.void_(),
	utils::Vector{
	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(GlslGeneratorImplTest_Function, Emit_Function_WithParams) {
	Func("my_func",
	utils::Vector{
	Param("a", ty.f32()),
	Param("b", ty.i32()),
	},
	ty.void_(),
	utils::Vector{
	Return(),
	});

	GeneratorImpl& gen = Build();

	gen.increment_indent();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"( #version 310 es

	void my_func(float a, int b) {
	return;
	}

	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_NoReturn_Void) {
	Func("func", utils::Empty, ty.void_(), utils::Empty /* no explicit return */,
	utils::Vector{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	void func() {
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, PtrParameter) {
	// fn f(foo : ptr<function, f32>) -> f32 {
	// return *foo;
	// }
	Func("f", utils::Vector{Param("foo", ty.pointer<f32>(ast::AddressSpace::kFunction))}, ty.f32(),
	utils::Vector{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(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_WithInOutVars) {
	// fn frag_main(@location(0) foo : f32) -> @location(1) f32 {
	// return foo;
	// }
	Func("frag_main",
	utils::Vector{
	Param("foo", ty.f32(), utils::Vector{Location(0_a)}),
	},
	ty.f32(),
	utils::Vector{
	Return("foo"),
	},
	utils::Vector{
	Stage(ast::PipelineStage::kFragment),
	},
	utils::Vector{
	Location(1_a),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	layout(location = 0) in float foo_1;
	layout(location = 1) out float value;
	float frag_main(float foo) {
	return foo;
	}

	void main() {
	float inner_result = frag_main(foo_1);
	value = inner_result;
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_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>(), utils::Vector{Builtin(ast::BuiltinValue::kPosition)});
	Func("frag_main",
	utils::Vector{
	coord_in,
	},
	ty.f32(),
	utils::Vector{
	Return(MemberAccessor("coord", "x")),
	},
	utils::Vector{
	Stage(ast::PipelineStage::kFragment),
	},
	utils::Vector{
	Builtin(ast::BuiltinValue::kFragDepth),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	float frag_main(vec4 coord) {
	return coord.x;
	}

	void main() {
	float inner_result = frag_main(gl_FragCoord);
	gl_FragDepth = inner_result;
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_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",
	utils::Vector{
	Member("pos", ty.vec4<f32>(), utils::Vector{Builtin(ast::BuiltinValue::kPosition)}),
	Member("col1", ty.f32(), utils::Vector{Location(1_a)}),
	Member("col2", ty.f32(), utils::Vector{Location(2_a)}),
	});

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

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

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	layout(location = 1) out float col1_1;
	layout(location = 2) out float col2_1;
	layout(location = 1) in float col1_2;
	layout(location = 2) in float col2_2;
	struct Interface {
	vec4 pos;
	float col1;
	float col2;
	};

	Interface vert_main() {
	Interface tint_symbol = Interface(vec4(0.0f), 0.5f, 0.25f);
	return tint_symbol;
	}

	void main() {
	gl_PointSize = 1.0;
	Interface inner_result = vert_main();
	gl_Position = inner_result.pos;
	col1_1 = inner_result.col1;
	col2_1 = inner_result.col2;
	gl_Position.y = -(gl_Position.y);
	gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
	return;
	}
	void frag_main(Interface inputs) {
	float r = inputs.col1;
	float g = inputs.col2;
	vec4 p = inputs.pos;
	}

	void main_1() {
	Interface tint_symbol_1 = Interface(gl_FragCoord, col1_2, col2_2);
	frag_main(tint_symbol_1);
	return;
	}
	)");
	}

	#if 0
	TEST_F(GlslGeneratorImplTest_Function,
	Emit_Attribute_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::BuiltinValue::kPosition)})});

	Func("foo", utils::Vector{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", utils::Empty, ty.Of(vertex_output_struct),
	{Return(Construct(ty.Of(vertex_output_struct),
	Expr(Call("foo", Expr(0.5_f)))))},
	{Stage(ast::PipelineStage::kVertex)});

	Func("vert_main2", utils::Empty, ty.Of(vertex_output_struct),
	{Return(Construct(ty.Of(vertex_output_struct),
	Expr(Call("foo", Expr(0.25_f)))))},
	{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;
	}
	)");
	}
	#endif

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_Uniform) {
	auto* ubo_ty = Structure("UBO", utils::Vector{Member("coord", ty.vec4<f32>())});
	auto* ubo =
	GlobalVar("ubo", ty.Of(ubo_ty), ast::AddressSpace::kUniform, Binding(0_a), Group(1_a));

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

	auto* var = Var("v", ty.f32(), Call("sub_func", 1_f));

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

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	struct UBO {
	vec4 coord;
	};

	layout(binding = 0, std140) uniform UBO_ubo {
	vec4 coord;
	} ubo;

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

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

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_UniformStruct) {
	auto* s = Structure("Uniforms", utils::Vector{Member("coord", ty.vec4<f32>())});

	GlobalVar("uniforms", ty.Of(s), ast::AddressSpace::kUniform, Binding(0_a), Group(1_a));

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

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

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	struct Uniforms {
	vec4 coord;
	};

	layout(binding = 0, std140) uniform Uniforms_ubo {
	vec4 coord;
	} uniforms;

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

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_RW_StorageBuffer_Read) {
	auto* s = Structure("Data", utils::Vector{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	});

	GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
	Group(1_a));

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

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

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	struct Data {
	int a;
	float b;
	};

	layout(binding = 0, std430) buffer coord_block_ssbo {
	Data inner;
	} coord;

	void frag_main() {
	float v = coord.inner.b;
	return;
	}

	void main() {
	frag_main();
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_RO_StorageBuffer_Read) {
	auto* s = Structure("Data", utils::Vector{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	});

	GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kRead, Binding(0_a),
	Group(1_a));

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

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

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(),
	R"(#version 310 es
	precision mediump float;

	struct Data {
	int a;
	float b;
	};

	layout(binding = 0, std430) buffer coord_block_ssbo {
	Data inner;
	} coord;

	void frag_main() {
	float v = coord.inner.b;
	return;
	}

	void main() {
	frag_main();
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_WO_StorageBuffer_Store) {
	auto* s = Structure("Data", utils::Vector{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	});

	GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
	Group(1_a));

	Func("frag_main", utils::Empty, ty.void_(),
	utils::Vector{
	Assign(MemberAccessor("coord", "b"), Expr(2_f)),
	Return(),
	},
	utils::Vector{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	struct Data {
	int a;
	float b;
	};

	layout(binding = 0, std430) buffer coord_block_ssbo {
	Data inner;
	} coord;

	void frag_main() {
	coord.inner.b = 2.0f;
	return;
	}

	void main() {
	frag_main();
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_With_StorageBuffer_Store) {
	auto* s = Structure("Data", utils::Vector{
	Member("a", ty.i32()),
	Member("b", ty.f32()),
	});

	GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
	Group(1_a));

	Func("frag_main", utils::Empty, ty.void_(),
	utils::Vector{
	Assign(MemberAccessor("coord", "b"), Expr(2_f)),
	Return(),
	},
	utils::Vector{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	struct Data {
	int a;
	float b;
	};

	layout(binding = 0, std430) buffer coord_block_ssbo {
	Data inner;
	} coord;

	void frag_main() {
	coord.inner.b = 2.0f;
	return;
	}

	void main() {
	frag_main();
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_Called_By_EntryPoint_With_Uniform) {
	auto* s = Structure("S", utils::Vector{Member("x", ty.f32())});
	GlobalVar("coord", ty.Of(s), ast::AddressSpace::kUniform, Binding(0_a), Group(1_a));

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

	auto* var = Var("v", ty.f32(), Call("sub_func", 1_f));

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

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	struct S {
	float x;
	};

	layout(binding = 0, std140) uniform S_ubo {
	float x;
	} coord;

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

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

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_Called_By_EntryPoint_With_StorageBuffer) {
	auto* s = Structure("S", utils::Vector{Member("x", ty.f32())});
	GlobalVar("coord", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
	Group(1_a));

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

	auto* var = Var("v", ty.f32(), Call("sub_func", 1_f));

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

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(),
	R"(#version 310 es
	precision mediump float;

	struct S {
	float x;
	};

	layout(binding = 0, std430) buffer coord_block_ssbo {
	S inner;
	} coord;

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

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

	void main() {
	frag_main();
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_WithNameCollision) {
	Func("centroid", utils::Empty, ty.void_(), {},
	utils::Vector{
	Stage(ast::PipelineStage::kFragment),
	});

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es
	precision mediump float;

	void tint_symbol() {
	}

	void main() {
	tint_symbol();
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_Compute) {
	Func("main", utils::Empty, ty.void_(),
	utils::Vector{
	Return(),
	},
	utils::Vector{
	Stage(ast::PipelineStage::kCompute),
	WorkgroupSize(1_i),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es

	layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
	void main() {
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_Compute_WithWorkgroup_Literal) {
	Func("main", utils::Empty, ty.void_(), {},
	utils::Vector{
	Stage(ast::PipelineStage::kCompute),
	WorkgroupSize(2_i, 4_i, 6_i),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es

	layout(local_size_x = 2, local_size_y = 4, local_size_z = 6) in;
	void main() {
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Attribute_EntryPoint_Compute_WithWorkgroup_Const) {
	GlobalConst("width", ty.i32(), Construct(ty.i32(), 2_i));
	GlobalConst("height", ty.i32(), Construct(ty.i32(), 3_i));
	GlobalConst("depth", ty.i32(), Construct(ty.i32(), 4_i));
	Func("main", utils::Empty, ty.void_(), {},
	utils::Vector{
	Stage(ast::PipelineStage::kCompute),
	WorkgroupSize("width", "height", "depth"),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es

	layout(local_size_x = 2, local_size_y = 3, local_size_z = 4) in;
	void main() {
	return;
	}
	)");
	}

	TEST_F(GlslGeneratorImplTest_Function,
	Emit_Attribute_EntryPoint_Compute_WithWorkgroup_OverridableConst) {
	Override("width", ty.i32(), Construct(ty.i32(), 2_i), Id(7_u));
	Override("height", ty.i32(), Construct(ty.i32(), 3_i), Id(8_u));
	Override("depth", ty.i32(), Construct(ty.i32(), 4_i), Id(9_u));
	Func("main", utils::Empty, ty.void_(), {},
	utils::Vector{
	Stage(ast::PipelineStage::kCompute),
	WorkgroupSize("width", "height", "depth"),
	});

	GeneratorImpl& gen = Build();

	EXPECT_FALSE(gen.Generate()) << gen.error();
	EXPECT_EQ(
	gen.error(),
	R"(error: override-expressions should have been removed with the SubstituteOverride transform)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Function_WithArrayParams) {
	Func("my_func", utils::Vector{Param("a", ty.array<f32, 5>())}, ty.void_(),
	utils::Vector{
	Return(),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es

	void my_func(float a[5]) {
	return;
	}

	)");
	}

	TEST_F(GlslGeneratorImplTest_Function, Emit_Function_WithArrayReturn) {
	Func("my_func", utils::Empty, ty.array<f32, 5>(),
	utils::Vector{
	Return(Construct(ty.array<f32, 5>())),
	});

	GeneratorImpl& gen = Build();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es

	float[5] my_func() {
	return float[5](0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
	}

	)");
	}

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

	auto* s = Structure("Data", utils::Vector{Member("d", ty.f32())});

	GlobalVar("data", ty.Of(s), ast::AddressSpace::kStorage, ast::Access::kReadWrite, Binding(0_a),
	Group(0_a));

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

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

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

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

	GeneratorImpl& gen = SanitizeAndBuild();

	ASSERT_TRUE(gen.Generate()) << gen.error();
	EXPECT_EQ(gen.result(), R"(#version 310 es

	struct Data {
	float d;
	};

	layout(binding = 0, std430) buffer data_block_ssbo {
	Data inner;
	} data;

	void a() {
	float v = data.inner.d;
	return;
	}

	layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
	void main() {
	a();
	return;
	}
	void b() {
	float v = data.inner.d;
	return;
	}

	layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
	void main_1() {
	b();
	return;
	}
	)");
	}

	} // namespace
	} // namespace tint::writer::glsl