src/writer/glsl/generator_impl_function_test.cc

// 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/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/glsl/test_helper.h"

using ::testing::HasSubstr;

namespace tint {
namespace writer {
namespace glsl {
namespace {

using GlslGeneratorImplTest_Function = TestHelper;

TEST_F(GlslGeneratorImplTest_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"(  #version 310 es
  precision mediump float;

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

TEST_F(GlslGeneratorImplTest_Function, Emit_Function_Name_Collision) {
  Func("centroid", 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(GlslGeneratorImplTest_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"(  #version 310 es
  precision mediump float;

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

TEST_F(GlslGeneratorImplTest_Function,
       Emit_Decoration_EntryPoint_NoReturn_Void) {
  Func("func", 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"(#version 310 es
precision mediump float;

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


)");
}

TEST_F(GlslGeneratorImplTest_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(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

struct tint_symbol_1 {
  float foo;
};
struct tint_symbol_2 {
  float value;
};

float frag_main_inner(float foo) {
  return foo;
}

tint_symbol_2 frag_main(tint_symbol_1 tint_symbol) {
  float inner_result = frag_main_inner(tint_symbol.foo);
  tint_symbol_2 wrapper_result = tint_symbol_2(0.0f);
  wrapper_result.value = inner_result;
  return wrapper_result;
}
in float foo;
out float value;
void main() {
  tint_symbol_1 inputs;
  inputs.foo = foo;
  tint_symbol_2 outputs;
  outputs = frag_main(inputs);
  value = outputs.value;
}


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

struct tint_symbol_1 {
  vec4 coord;
};
struct tint_symbol_2 {
  float value;
};

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

tint_symbol_2 frag_main(tint_symbol_1 tint_symbol) {
  float inner_result = frag_main_inner(tint_symbol.coord);
  tint_symbol_2 wrapper_result = tint_symbol_2(0.0f);
  wrapper_result.value = inner_result;
  return wrapper_result;
}
void main() {
  tint_symbol_1 inputs;
  inputs.coord = gl_Position;
  tint_symbol_2 outputs;
  outputs = frag_main(inputs);
  gl_FragDepth = outputs.value;
}


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

struct Interface {
  vec4 pos;
  float col1;
  float col2;
};
struct tint_symbol {
  float col1;
  float col2;
  vec4 pos;
};

Interface vert_main_inner() {
  Interface tint_symbol_3 = Interface(vec4(0.0f, 0.0f, 0.0f, 0.0f), 0.5f, 0.25f);
  return tint_symbol_3;
}

tint_symbol vert_main() {
  Interface inner_result = vert_main_inner();
  tint_symbol wrapper_result = tint_symbol(0.0f, 0.0f, vec4(0.0f, 0.0f, 0.0f, 0.0f));
  wrapper_result.pos = inner_result.pos;
  wrapper_result.col1 = inner_result.col1;
  wrapper_result.col2 = inner_result.col2;
  return wrapper_result;
}
out float col1;
out float col2;
void main() {
  tint_symbol outputs;
  outputs = vert_main();
  col1 = outputs.col1;
  col2 = outputs.col2;
  gl_Position = outputs.pos;
  gl_Position.y = -gl_Position.y;
}



struct tint_symbol_2 {
  float col1;
  float col2;
  vec4 pos;
};

void frag_main_inner(Interface inputs) {
  float r = inputs.col1;
  float g = inputs.col2;
  vec4 p = inputs.pos;
}

void frag_main(tint_symbol_2 tint_symbol_1) {
  Interface tint_symbol_4 = Interface(tint_symbol_1.pos, tint_symbol_1.col1, tint_symbol_1.col2);
  frag_main_inner(tint_symbol_4);
  return;
}
in float col1;
in float col2;
void main() {
  tint_symbol_2 inputs;
  inputs.col1 = col1;
  inputs.col2 = col2;
  inputs.pos = gl_Position;
  frag_main(inputs);
}


)");
}

#if 0
TEST_F(GlslGeneratorImplTest_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(Construct(ty.Of(vertex_output_struct),
                         Expr(Call("foo", Expr(0.5f)))))},
       {Stage(ast::PipelineStage::kVertex)});

  Func("vert_main2", {}, ty.Of(vertex_output_struct),
       {Return(Construct(ty.Of(vertex_output_struct),
                         Expr(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;
}
)");
}
#endif

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) uniform UBO_1 {
  vec4 coord;
} ubo;

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

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) uniform Uniforms_1 {
  vec4 coord;
} uniforms;

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) buffer Data_1 {
  int a;
  float b;
} coord;

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) buffer Data_1 {
  int a;
  float b;
} coord;

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) buffer Data_1 {
  int a;
  float b;
} coord;

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) buffer Data_1 {
  int a;
  float b;
} coord;

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) uniform S_1 {
  float x;
} coord;

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

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;


layout (binding = 0) buffer S_1 {
  float x;
} coord;

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

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


)");
}

TEST_F(GlslGeneratorImplTest_Function,
       Emit_Decoration_EntryPoint_WithNameCollision) {
  Func("centroid", ast::VariableList{}, ty.void_(), {},
       {
           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() {
  return;
}
void main() {
  tint_symbol();
}


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

const int width = int(2);
const int height = int(3);
const int depth = int(4);

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


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

#ifndef WGSL_SPEC_CONSTANT_7
#define WGSL_SPEC_CONSTANT_7 int(2)
#endif
const int width = WGSL_SPEC_CONSTANT_7;
#ifndef WGSL_SPEC_CONSTANT_8
#define WGSL_SPEC_CONSTANT_8 int(3)
#endif
const int height = WGSL_SPEC_CONSTANT_8;
#ifndef WGSL_SPEC_CONSTANT_9
#define WGSL_SPEC_CONSTANT_9 int(4)
#endif
const int depth = WGSL_SPEC_CONSTANT_9;

layout(local_size_x = WGSL_SPEC_CONSTANT_7, local_size_y = WGSL_SPEC_CONSTANT_8, local_size_z = WGSL_SPEC_CONSTANT_9) in;
void main() {
  return;
}
void main() {
  main();
}


)");
}

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

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

TEST_F(GlslGeneratorImplTest_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"(#version 310 es
precision mediump float;

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) {
  // [[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"(#version 310 es
precision mediump float;


layout (binding = 0) buffer Data_1 {
  float d;
} data;

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



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


)");
}

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