gpu/command_buffer/tests/gl_bind_uniform_location_unittest.cc - codesearch/chromium/src - Git at Google

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stdint.h>

 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"

 #define SHADER(Src) #Src

 namespace gpu {

 class BindUniformLocationTest : public testing::TestWithParam<bool> {
  protected:
   static const GLsizei kResolution = 4;
   void SetUp() override {
     GLManager::Options options;
     options.size = gfx::Size(kResolution, kResolution);
     options.force_shader_name_hashing = GetParam();
     gl_.Initialize(options);
   }

   void TearDown() override { gl_.Destroy(); }

   GLManager gl_;
 };

 TEST_P(BindUniformLocationTest, Basic) {
   ASSERT_TRUE(
       GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

   static const char* v_shader_str = SHADER(
       attribute vec4 a_position;
       void main()
       {
          gl_Position = a_position;
       }
   );
   static const char* f_shader_str = SHADER(
       precision mediump float;
       uniform vec4 u_colorC;
       uniform vec4 u_colorB[2];
       uniform vec4 u_colorA;
       void main()
       {
         gl_FragColor = u_colorA + u_colorB[0] + u_colorB[1] + u_colorC;
       }
   );

   GLint color_a_location = 3;
   GLint color_b_location = 10;
   GLint color_c_location = 5;

   GLuint vertex_shader = GLTestHelper::LoadShader(
       GL_VERTEX_SHADER, v_shader_str);
   GLuint fragment_shader = GLTestHelper::LoadShader(
       GL_FRAGMENT_SHADER, f_shader_str);

   GLuint program = glCreateProgram();

   glBindUniformLocationCHROMIUM(program, color_a_location, "u_colorA");
   glBindUniformLocationCHROMIUM(program, color_b_location, "u_colorB[0]");
   glBindUniformLocationCHROMIUM(program, color_c_location, "u_colorC");

   glAttachShader(program, vertex_shader);
   glAttachShader(program, fragment_shader);
   // Link the program
   glLinkProgram(program);
   // Check the link status
   GLint linked = 0;
   glGetProgramiv(program, GL_LINK_STATUS, &linked);
   EXPECT_EQ(1, linked);

   GLint position_loc = glGetAttribLocation(program, "a_position");

   GLTestHelper::SetupUnitQuad(position_loc);

   glUseProgram(program);

   static const float color_b[] = {
     0.0f, 0.50f, 0.0f, 0.0f,
     0.0f, 0.0f, 0.75f, 0.0f,
   };

   glUniform4f(color_a_location, 0.25f, 0.0f, 0.0f, 0.0f);
   glUniform4fv(color_b_location, 2, color_b);
   glUniform4f(color_c_location, 0.0f, 0.0f, 0.0f, 1.0f);

   glDrawArrays(GL_TRIANGLES, 0, 6);

   static const uint8_t expected[] = {64, 128, 192, 255};
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kResolution, kResolution, 1,
                                         expected, nullptr));

   GLTestHelper::CheckGLError("no errors", __LINE__);
 }

 TEST_P(BindUniformLocationTest, ConflictsDetection) {
   ASSERT_TRUE(
       GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

   static const char* v_shader_str = SHADER(
       attribute vec4 a_position;
       void main()
       {
          gl_Position = a_position;
       }
   );
   static const char* f_shader_str = SHADER(
       precision mediump float;
       uniform vec4 u_colorA;
       uniform vec4 u_colorB;
       void main()
       {
         gl_FragColor = u_colorA + u_colorB;
       }
   );

   GLint color_a_location = 3;
   GLint color_b_location = 4;

   GLuint vertex_shader = GLTestHelper::LoadShader(
       GL_VERTEX_SHADER, v_shader_str);
   GLuint fragment_shader = GLTestHelper::LoadShader(
       GL_FRAGMENT_SHADER, f_shader_str);

   GLuint program = glCreateProgram();
   glAttachShader(program, vertex_shader);
   glAttachShader(program, fragment_shader);

   glBindUniformLocationCHROMIUM(program, color_a_location, "u_colorA");
   // Bind u_colorB to location a, causing conflicts, link should fail.
   glBindUniformLocationCHROMIUM(program, color_a_location, "u_colorB");
   glLinkProgram(program);
   GLint linked = 0;
   glGetProgramiv(program, GL_LINK_STATUS, &linked);
   EXPECT_EQ(0, linked);

   // Bind u_colorB to location b, no conflicts, link should succeed.
   glBindUniformLocationCHROMIUM(program, color_b_location, "u_colorB");
   glLinkProgram(program);
   linked = 0;
   glGetProgramiv(program, GL_LINK_STATUS, &linked);
   EXPECT_EQ(1, linked);

   GLTestHelper::CheckGLError("no errors", __LINE__);
 }

 TEST_P(BindUniformLocationTest, Compositor) {
   ASSERT_TRUE(
       GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

   static const char* v_shader_str = SHADER(
       attribute vec4 a_position;
       attribute vec2 a_texCoord;
       uniform mat4 matrix;
       uniform vec2 color_a[4];
       uniform vec4 color_b;
       varying vec4 v_color;
       void main()
       {
           v_color.xy = color_a[0] + color_a[1];
           v_color.zw = color_a[2] + color_a[3];
           v_color += color_b;
           gl_Position = matrix * a_position;
       }
   );

   static const char* f_shader_str =  SHADER(
       precision mediump float;
       varying vec4 v_color;
       uniform float alpha;
       uniform vec4 multiplier;
       uniform vec3 color_c[8];
       void main()
       {
           vec4 color_c_sum = vec4(0.0);
           color_c_sum.xyz += color_c[0];
           color_c_sum.xyz += color_c[1];
           color_c_sum.xyz += color_c[2];
           color_c_sum.xyz += color_c[3];
           color_c_sum.xyz += color_c[4];
           color_c_sum.xyz += color_c[5];
           color_c_sum.xyz += color_c[6];
           color_c_sum.xyz += color_c[7];
           color_c_sum.w = alpha;
           color_c_sum *= multiplier;
           gl_FragColor = v_color + color_c_sum;
       }
   );

   int counter = 6;
   int matrix_location = counter++;
   int color_a_location = counter++;
   int color_b_location = counter++;
   int alpha_location = counter++;
   int multiplier_location = counter++;
   int color_c_location = counter++;

   GLuint vertex_shader = GLTestHelper::LoadShader(
       GL_VERTEX_SHADER, v_shader_str);
   GLuint fragment_shader = GLTestHelper::LoadShader(
       GL_FRAGMENT_SHADER, f_shader_str);

   GLuint program = glCreateProgram();

   glBindUniformLocationCHROMIUM(program, matrix_location, "matrix");
   glBindUniformLocationCHROMIUM(program, color_a_location, "color_a");
   glBindUniformLocationCHROMIUM(program, color_b_location, "color_b");
   glBindUniformLocationCHROMIUM(program, alpha_location, "alpha");
   glBindUniformLocationCHROMIUM(program, multiplier_location, "multiplier");
   glBindUniformLocationCHROMIUM(program, color_c_location, "color_c");

   glAttachShader(program, vertex_shader);
   glAttachShader(program, fragment_shader);
   // Link the program
   glLinkProgram(program);
   // Check the link status
   GLint linked = 0;
   glGetProgramiv(program, GL_LINK_STATUS, &linked);
   EXPECT_EQ(1, linked);

   GLint position_loc = glGetAttribLocation(program, "a_position");

   GLTestHelper::SetupUnitQuad(position_loc);

   glUseProgram(program);

   static const float color_a[] = {
     0.1f, 0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f, 0.1f,
   };

   static const float color_c[] = {
     0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f,
     0.1f, 0.1f, 0.1f,
   };

   static const float identity[] = {
     1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1,
   };

   glUniformMatrix4fv(matrix_location, 1, false, identity);
   glUniform2fv(color_a_location, 4, color_a);
   glUniform4f(color_b_location, 0.2f, 0.2f, 0.2f, 0.2f);
   glUniform1f(alpha_location, 0.8f);
   glUniform4f(multiplier_location, 0.5f, 0.5f, 0.5f, 0.5f);
   glUniform3fv(color_c_location, 8, color_c);

   glDrawArrays(GL_TRIANGLES, 0, 6);

   static const uint8_t expected[] = {204, 204, 204, 204};
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kResolution, kResolution, 1,
                                         expected, nullptr));

   GLTestHelper::CheckGLError("no errors", __LINE__);

 }

 TEST_P(BindUniformLocationTest, UnusedUniformUpdate) {
   ASSERT_TRUE(GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

   // clang-format off
   static const char* kVertexShaderString = SHADER(
       attribute vec4 a_position;
       void main() {
         gl_Position = a_position;
       }
   );
   static const char* kFragmentShaderString = SHADER(
       precision mediump float;
       uniform vec4 u_colorA;
       uniform float u_colorU;
       uniform vec4 u_colorC;
       void main() {
         gl_FragColor = u_colorA + u_colorC;
       }
   );
   // clang-format on
   const GLint kColorULocation = 1;
   const GLint kNonexistingLocation = 5;
   const GLint kUnboundLocation = 6;

   GLuint vertex_shader =
       GLTestHelper::LoadShader(GL_VERTEX_SHADER, kVertexShaderString);
   GLuint fragment_shader =
       GLTestHelper::LoadShader(GL_FRAGMENT_SHADER, kFragmentShaderString);
   GLuint program = glCreateProgram();
   glBindUniformLocationCHROMIUM(program, kColorULocation, "u_colorU");
   // The non-existing uniform should behave like existing, but optimized away
   // uniform.
   glBindUniformLocationCHROMIUM(program, kNonexistingLocation, "nonexisting");
   // Let A and C be assigned automatic locations.
   glAttachShader(program, vertex_shader);
   glAttachShader(program, fragment_shader);
   glLinkProgram(program);
   GLint linked = 0;
   glGetProgramiv(program, GL_LINK_STATUS, &linked);
   EXPECT_EQ(1, linked);
   glUseProgram(program);

   // No errors on bound locations, since caller does not know
   // if the driver optimizes them away or not.
   glUniform1f(kColorULocation, 0.25f);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

   // No errors on bound locations of names that do not exist
   // in the shader. Otherwise it would be inconsistent wrt the
   // optimization case.
   glUniform1f(kNonexistingLocation, 0.25f);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

   // The above are equal to updating -1.
   glUniform1f(-1, 0.25f);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

   // No errors when updating with other type either.
   // The type can not be known with the non-existing case.
   glUniform2f(kColorULocation, 0.25f, 0.25f);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
   glUniform2f(kNonexistingLocation, 0.25f, 0.25f);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
   glUniform2f(-1, 0.25f, 0.25f);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

   // Ensure that driver or ANGLE has optimized the variable
   // away and the test tests what it is supposed to.
   EXPECT_EQ(-1, glGetUniformLocation(program, "u_colorU"));

   // The bound location gets marked as used and the driver
   // does not allocate other variables to that location.
   EXPECT_NE(kColorULocation, glGetUniformLocation(program, "u_colorA"));
   EXPECT_NE(kColorULocation, glGetUniformLocation(program, "u_colorC"));
   EXPECT_NE(kNonexistingLocation, glGetUniformLocation(program, "u_colorA"));
   EXPECT_NE(kNonexistingLocation, glGetUniformLocation(program, "u_colorC"));

   // Unintuitive: while specifying value works, getting the value does not.
   GLfloat get_result = 0.0f;
   glGetUniformfv(program, kColorULocation, &get_result);
   EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
   glGetUniformfv(program, kNonexistingLocation, &get_result);
   EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
   glGetUniformfv(program, -1, &get_result);
   EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());

   // Updating an unbound, non-existing location still causes
   // an error.
   glUniform1f(kUnboundLocation, 0.25f);
   EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
 }

 // Test for a bug where using a sampler caused GL error if the program had
 // uniforms that were optimized away by the driver. This was only a problem with
 // glBindUniformLocationCHROMIUM implementation. This could be reproed by
 // binding the sampler to a location higher than the amount of active uniforms.
 TEST_P(BindUniformLocationTest, UseSamplerWhenUnusedUniforms) {
   enum {
     kTexLocation = 54
   };
   // clang-format off
   static const char* vertexShaderString = SHADER(
       void main() {
         gl_Position = vec4(0);
       }
   );
   static const char* fragmentShaderString = SHADER(
       uniform sampler2D tex;
       void main() {
         gl_FragColor = texture2D(tex, vec2(1));
       }
   );
   // clang-format on
   GLuint vs = GLTestHelper::CompileShader(GL_VERTEX_SHADER, vertexShaderString);
   GLuint fs = GLTestHelper::CompileShader(GL_FRAGMENT_SHADER,
                                           fragmentShaderString);

   GLuint program = glCreateProgram();
   glBindUniformLocationCHROMIUM(program, kTexLocation, "tex");

   glAttachShader(program, vs);
   glAttachShader(program, fs);

   glLinkProgram(program);

   GLint linked = 0;
   glGetProgramiv(program, GL_LINK_STATUS, &linked);
   EXPECT_NE(0, linked);
   glUseProgram(program);
   glUniform1i(kTexLocation, 0);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
 }

 INSTANTIATE_TEST_SUITE_P(WithAndWithoutShaderNameMapping,
                          BindUniformLocationTest,
                          ::testing::Bool());

 }  // namespace gpu
	// Copyright (c) 2012 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include <GLES2/gl2.h>
	#include <GLES2/gl2ext.h>
	#include <GLES2/gl2extchromium.h>
	#include <stdint.h>

	#include "gpu/command_buffer/tests/gl_manager.h"
	#include "gpu/command_buffer/tests/gl_test_utils.h"
	#include "testing/gmock/include/gmock/gmock.h"
	#include "testing/gtest/include/gtest/gtest.h"

	#define SHADER(Src) #Src

	namespace gpu {

	class BindUniformLocationTest : public testing::TestWithParam<bool> {
	protected:
	static const GLsizei kResolution = 4;
	void SetUp() override {
	GLManager::Options options;
	options.size = gfx::Size(kResolution, kResolution);
	options.force_shader_name_hashing = GetParam();
	gl_.Initialize(options);
	}

	void TearDown() override { gl_.Destroy(); }

	GLManager gl_;
	};

	TEST_P(BindUniformLocationTest, Basic) {
	ASSERT_TRUE(
	GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

	static const char* v_shader_str = SHADER(
	attribute vec4 a_position;
	void main()
	{
	gl_Position = a_position;
	}
	);
	static const char* f_shader_str = SHADER(
	precision mediump float;
	uniform vec4 u_colorC;
	uniform vec4 u_colorB[2];
	uniform vec4 u_colorA;
	void main()
	{
	gl_FragColor = u_colorA + u_colorB[0] + u_colorB[1] + u_colorC;
	}
	);

	GLint color_a_location = 3;
	GLint color_b_location = 10;
	GLint color_c_location = 5;

	GLuint vertex_shader = GLTestHelper::LoadShader(
	GL_VERTEX_SHADER, v_shader_str);
	GLuint fragment_shader = GLTestHelper::LoadShader(
	GL_FRAGMENT_SHADER, f_shader_str);

	GLuint program = glCreateProgram();

	glBindUniformLocationCHROMIUM(program, color_a_location, "u_colorA");
	glBindUniformLocationCHROMIUM(program, color_b_location, "u_colorB[0]");
	glBindUniformLocationCHROMIUM(program, color_c_location, "u_colorC");

	glAttachShader(program, vertex_shader);
	glAttachShader(program, fragment_shader);
	// Link the program
	glLinkProgram(program);
	// Check the link status
	GLint linked = 0;
	glGetProgramiv(program, GL_LINK_STATUS, &linked);
	EXPECT_EQ(1, linked);

	GLint position_loc = glGetAttribLocation(program, "a_position");

	GLTestHelper::SetupUnitQuad(position_loc);

	glUseProgram(program);

	static const float color_b[] = {
	0.0f, 0.50f, 0.0f, 0.0f,
	0.0f, 0.0f, 0.75f, 0.0f,
	};

	glUniform4f(color_a_location, 0.25f, 0.0f, 0.0f, 0.0f);
	glUniform4fv(color_b_location, 2, color_b);
	glUniform4f(color_c_location, 0.0f, 0.0f, 0.0f, 1.0f);

	glDrawArrays(GL_TRIANGLES, 0, 6);

	static const uint8_t expected[] = {64, 128, 192, 255};
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kResolution, kResolution, 1,
	expected, nullptr));

	GLTestHelper::CheckGLError("no errors", __LINE__);
	}

	TEST_P(BindUniformLocationTest, ConflictsDetection) {
	ASSERT_TRUE(
	GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

	static const char* v_shader_str = SHADER(
	attribute vec4 a_position;
	void main()
	{
	gl_Position = a_position;
	}
	);
	static const char* f_shader_str = SHADER(
	precision mediump float;
	uniform vec4 u_colorA;
	uniform vec4 u_colorB;
	void main()
	{
	gl_FragColor = u_colorA + u_colorB;
	}
	);

	GLint color_a_location = 3;
	GLint color_b_location = 4;

	GLuint vertex_shader = GLTestHelper::LoadShader(
	GL_VERTEX_SHADER, v_shader_str);
	GLuint fragment_shader = GLTestHelper::LoadShader(
	GL_FRAGMENT_SHADER, f_shader_str);

	GLuint program = glCreateProgram();
	glAttachShader(program, vertex_shader);
	glAttachShader(program, fragment_shader);

	glBindUniformLocationCHROMIUM(program, color_a_location, "u_colorA");
	// Bind u_colorB to location a, causing conflicts, link should fail.
	glBindUniformLocationCHROMIUM(program, color_a_location, "u_colorB");
	glLinkProgram(program);
	GLint linked = 0;
	glGetProgramiv(program, GL_LINK_STATUS, &linked);
	EXPECT_EQ(0, linked);

	// Bind u_colorB to location b, no conflicts, link should succeed.
	glBindUniformLocationCHROMIUM(program, color_b_location, "u_colorB");
	glLinkProgram(program);
	linked = 0;
	glGetProgramiv(program, GL_LINK_STATUS, &linked);
	EXPECT_EQ(1, linked);

	GLTestHelper::CheckGLError("no errors", __LINE__);
	}

	TEST_P(BindUniformLocationTest, Compositor) {
	ASSERT_TRUE(
	GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

	static const char* v_shader_str = SHADER(
	attribute vec4 a_position;
	attribute vec2 a_texCoord;
	uniform mat4 matrix;
	uniform vec2 color_a[4];
	uniform vec4 color_b;
	varying vec4 v_color;
	void main()
	{
	v_color.xy = color_a[0] + color_a[1];
	v_color.zw = color_a[2] + color_a[3];
	v_color += color_b;
	gl_Position = matrix * a_position;
	}
	);

	static const char* f_shader_str = SHADER(
	precision mediump float;
	varying vec4 v_color;
	uniform float alpha;
	uniform vec4 multiplier;
	uniform vec3 color_c[8];
	void main()
	{
	vec4 color_c_sum = vec4(0.0);
	color_c_sum.xyz += color_c[0];
	color_c_sum.xyz += color_c[1];
	color_c_sum.xyz += color_c[2];
	color_c_sum.xyz += color_c[3];
	color_c_sum.xyz += color_c[4];
	color_c_sum.xyz += color_c[5];
	color_c_sum.xyz += color_c[6];
	color_c_sum.xyz += color_c[7];
	color_c_sum.w = alpha;
	color_c_sum *= multiplier;
	gl_FragColor = v_color + color_c_sum;
	}
	);

	int counter = 6;
	int matrix_location = counter++;
	int color_a_location = counter++;
	int color_b_location = counter++;
	int alpha_location = counter++;
	int multiplier_location = counter++;
	int color_c_location = counter++;

	GLuint vertex_shader = GLTestHelper::LoadShader(
	GL_VERTEX_SHADER, v_shader_str);
	GLuint fragment_shader = GLTestHelper::LoadShader(
	GL_FRAGMENT_SHADER, f_shader_str);

	GLuint program = glCreateProgram();

	glBindUniformLocationCHROMIUM(program, matrix_location, "matrix");
	glBindUniformLocationCHROMIUM(program, color_a_location, "color_a");
	glBindUniformLocationCHROMIUM(program, color_b_location, "color_b");
	glBindUniformLocationCHROMIUM(program, alpha_location, "alpha");
	glBindUniformLocationCHROMIUM(program, multiplier_location, "multiplier");
	glBindUniformLocationCHROMIUM(program, color_c_location, "color_c");

	glAttachShader(program, vertex_shader);
	glAttachShader(program, fragment_shader);
	// Link the program
	glLinkProgram(program);
	// Check the link status
	GLint linked = 0;
	glGetProgramiv(program, GL_LINK_STATUS, &linked);
	EXPECT_EQ(1, linked);

	GLint position_loc = glGetAttribLocation(program, "a_position");

	GLTestHelper::SetupUnitQuad(position_loc);

	glUseProgram(program);

	static const float color_a[] = {
	0.1f, 0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f, 0.1f,
	};

	static const float color_c[] = {
	0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f,
	0.1f, 0.1f, 0.1f,
	};

	static const float identity[] = {
	1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1,
	};

	glUniformMatrix4fv(matrix_location, 1, false, identity);
	glUniform2fv(color_a_location, 4, color_a);
	glUniform4f(color_b_location, 0.2f, 0.2f, 0.2f, 0.2f);
	glUniform1f(alpha_location, 0.8f);
	glUniform4f(multiplier_location, 0.5f, 0.5f, 0.5f, 0.5f);
	glUniform3fv(color_c_location, 8, color_c);

	glDrawArrays(GL_TRIANGLES, 0, 6);

	static const uint8_t expected[] = {204, 204, 204, 204};
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kResolution, kResolution, 1,
	expected, nullptr));

	GLTestHelper::CheckGLError("no errors", __LINE__);

	}

	TEST_P(BindUniformLocationTest, UnusedUniformUpdate) {
	ASSERT_TRUE(GLTestHelper::HasExtension("GL_CHROMIUM_bind_uniform_location"));

	// clang-format off
	static const char* kVertexShaderString = SHADER(
	attribute vec4 a_position;
	void main() {
	gl_Position = a_position;
	}
	);
	static const char* kFragmentShaderString = SHADER(
	precision mediump float;
	uniform vec4 u_colorA;
	uniform float u_colorU;
	uniform vec4 u_colorC;
	void main() {
	gl_FragColor = u_colorA + u_colorC;
	}
	);
	// clang-format on
	const GLint kColorULocation = 1;
	const GLint kNonexistingLocation = 5;
	const GLint kUnboundLocation = 6;

	GLuint vertex_shader =
	GLTestHelper::LoadShader(GL_VERTEX_SHADER, kVertexShaderString);
	GLuint fragment_shader =
	GLTestHelper::LoadShader(GL_FRAGMENT_SHADER, kFragmentShaderString);
	GLuint program = glCreateProgram();
	glBindUniformLocationCHROMIUM(program, kColorULocation, "u_colorU");
	// The non-existing uniform should behave like existing, but optimized away
	// uniform.
	glBindUniformLocationCHROMIUM(program, kNonexistingLocation, "nonexisting");
	// Let A and C be assigned automatic locations.
	glAttachShader(program, vertex_shader);
	glAttachShader(program, fragment_shader);
	glLinkProgram(program);
	GLint linked = 0;
	glGetProgramiv(program, GL_LINK_STATUS, &linked);
	EXPECT_EQ(1, linked);
	glUseProgram(program);

	// No errors on bound locations, since caller does not know
	// if the driver optimizes them away or not.
	glUniform1f(kColorULocation, 0.25f);
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

	// No errors on bound locations of names that do not exist
	// in the shader. Otherwise it would be inconsistent wrt the
	// optimization case.
	glUniform1f(kNonexistingLocation, 0.25f);
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

	// The above are equal to updating -1.
	glUniform1f(-1, 0.25f);
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

	// No errors when updating with other type either.
	// The type can not be known with the non-existing case.
	glUniform2f(kColorULocation, 0.25f, 0.25f);
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
	glUniform2f(kNonexistingLocation, 0.25f, 0.25f);
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
	glUniform2f(-1, 0.25f, 0.25f);
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());

	// Ensure that driver or ANGLE has optimized the variable
	// away and the test tests what it is supposed to.
	EXPECT_EQ(-1, glGetUniformLocation(program, "u_colorU"));

	// The bound location gets marked as used and the driver
	// does not allocate other variables to that location.
	EXPECT_NE(kColorULocation, glGetUniformLocation(program, "u_colorA"));
	EXPECT_NE(kColorULocation, glGetUniformLocation(program, "u_colorC"));
	EXPECT_NE(kNonexistingLocation, glGetUniformLocation(program, "u_colorA"));
	EXPECT_NE(kNonexistingLocation, glGetUniformLocation(program, "u_colorC"));

	// Unintuitive: while specifying value works, getting the value does not.
	GLfloat get_result = 0.0f;
	glGetUniformfv(program, kColorULocation, &get_result);
	EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
	glGetUniformfv(program, kNonexistingLocation, &get_result);
	EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
	glGetUniformfv(program, -1, &get_result);
	EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());

	// Updating an unbound, non-existing location still causes
	// an error.
	glUniform1f(kUnboundLocation, 0.25f);
	EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
	}

	// Test for a bug where using a sampler caused GL error if the program had
	// uniforms that were optimized away by the driver. This was only a problem with
	// glBindUniformLocationCHROMIUM implementation. This could be reproed by
	// binding the sampler to a location higher than the amount of active uniforms.
	TEST_P(BindUniformLocationTest, UseSamplerWhenUnusedUniforms) {
	enum {
	kTexLocation = 54
	};
	// clang-format off
	static const char* vertexShaderString = SHADER(
	void main() {
	gl_Position = vec4(0);
	}
	);
	static const char* fragmentShaderString = SHADER(
	uniform sampler2D tex;
	void main() {
	gl_FragColor = texture2D(tex, vec2(1));
	}
	);
	// clang-format on
	GLuint vs = GLTestHelper::CompileShader(GL_VERTEX_SHADER, vertexShaderString);
	GLuint fs = GLTestHelper::CompileShader(GL_FRAGMENT_SHADER,
	fragmentShaderString);

	GLuint program = glCreateProgram();
	glBindUniformLocationCHROMIUM(program, kTexLocation, "tex");

	glAttachShader(program, vs);
	glAttachShader(program, fs);

	glLinkProgram(program);

	GLint linked = 0;
	glGetProgramiv(program, GL_LINK_STATUS, &linked);
	EXPECT_NE(0, linked);
	glUseProgram(program);
	glUniform1i(kTexLocation, 0);
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
	}

	INSTANTIATE_TEST_SUITE_P(WithAndWithoutShaderNameMapping,
	BindUniformLocationTest,
	::testing::Bool());

	} // namespace gpu