chromium/third_party/angle/src/tests/compiler_tests/InitOutputVariables_test.cpp

//
// Copyright 2017 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// InitOutputVariables_test.cpp: Tests correctness of the AST pass enabled through
// SH_INIT_OUTPUT_VARIABLES.
//

#include "common/angleutils.h"

#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_util/FindMain.h"
#include "compiler/translator/tree_util/IntermNode_util.h"
#include "compiler/translator/tree_util/IntermTraverse.h"
#include "tests/test_utils/ShaderCompileTreeTest.h"

#include <algorithm>

namespace sh
{

namespace
{

ExpectedLValues;

bool AreSymbolsTheSame(const TIntermSymbol *expected, const TIntermSymbol *candidate)
{ … }

bool AreLValuesTheSame(TIntermTyped *expected, TIntermTyped *candidate)
{ … }

TIntermTyped *CreateLValueNode(const ImmutableString &lValueName, const TType &type)
{ … }

ExpectedLValues CreateIndexedLValueNodeList(const ImmutableString &lValueName,
                                            const TType &elementType,
                                            unsigned arraySize)
{ … }

// VerifyOutputVariableInitializers traverses the subtree covering main and collects the lvalues in
// assignments for which the rvalue is an expression containing only zero constants.
class VerifyOutputVariableInitializers final : public TIntermTraverser
{ … };

// Traverses the AST and records a pointer to a structure with a given name.
class FindStructByName final : public TIntermTraverser
{ … };

}  // namespace

class InitOutputVariablesWebGL2Test : public ShaderCompileTreeTest
{ … };

class InitOutputVariablesWebGL2VertexShaderTest : public InitOutputVariablesWebGL2Test
{ … };

class InitOutputVariablesWebGL2FragmentShaderTest : public InitOutputVariablesWebGL2Test
{ … };

class InitOutputVariablesWebGL1FragmentShaderTest : public ShaderCompileTreeTest
{ … };

class InitOutputVariablesVertexShaderClipDistanceTest : public ShaderCompileTreeTest
{ … };

// Test the initialization of output variables with various qualifiers in a vertex shader.
TEST_F(InitOutputVariablesWebGL2VertexShaderTest, OutputAllQualifiers)
{ … }

// Test the initialization of an output array in a vertex shader.
TEST_F(InitOutputVariablesWebGL2VertexShaderTest, OutputArray)
{ … }

// Test the initialization of a struct output variable in a vertex shader.
TEST_F(InitOutputVariablesWebGL2VertexShaderTest, OutputStruct)
{ … }

// Test the initialization of a varying variable in an ESSL1 vertex shader.
TEST_F(InitOutputVariablesWebGL2VertexShaderTest, OutputFromESSL1Shader)
{ … }

// Test the initialization of output variables in a fragment shader.
TEST_F(InitOutputVariablesWebGL2FragmentShaderTest, Output)
{ … }

// Test the initialization of gl_FragData in a WebGL2 ESSL1 fragment shader. Only writes to
// gl_FragData[0] should be found.
TEST_F(InitOutputVariablesWebGL2FragmentShaderTest, FragData)
{ … }

// Test the initialization of gl_FragData in a WebGL1 ESSL1 fragment shader. Only writes to
// gl_FragData[0] should be found.
TEST_F(InitOutputVariablesWebGL1FragmentShaderTest, FragData)
{ … }

// Test the initialization of gl_FragData in a WebGL1 ESSL1 fragment shader with GL_EXT_draw_buffers
// enabled. All attachment slots should be initialized.
TEST_F(InitOutputVariablesWebGL1FragmentShaderTest, FragDataWithDrawBuffersExtEnabled)
{ … }

// Test that gl_Position is initialized once in case it is not statically used and both
// SH_INIT_OUTPUT_VARIABLES and SH_INIT_GL_POSITION flags are set.
TEST_F(InitOutputVariablesWebGL2VertexShaderTest, InitGLPositionWhenNotStaticallyUsed)
{ … }

// Test that gl_Position is initialized once in case it is statically used and both
// SH_INIT_OUTPUT_VARIABLES and SH_INIT_GL_POSITION flags are set.
TEST_F(InitOutputVariablesWebGL2VertexShaderTest, InitGLPositionOnceWhenStaticallyUsed)
{ … }

// Mirrors ClipDistanceTest.ThreeClipDistancesRedeclared
TEST_F(InitOutputVariablesVertexShaderClipDistanceTest, RedeclareClipDistance)
{ … }
}  // namespace sh