Source/ThirdParty/ANGLE/src/tests/gl_tests/SRGBTextureTest.cpp - WebKit - Git at Google

 //
 // Copyright 2015 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.
 //

 #include "test_utils/ANGLETest.h"
 #include "test_utils/gl_raii.h"

 namespace angle
 {

 // These two colors are equivelent in different colorspaces
 constexpr GLColor kLinearColor(64, 127, 191, 255);
 constexpr GLColor kNonlinearColor(13, 54, 133, 255);

 class SRGBTextureTest : public ANGLETest
 {
   protected:
     SRGBTextureTest()
     {
         setWindowWidth(128);
         setWindowHeight(128);
         setConfigRedBits(8);
         setConfigGreenBits(8);
         setConfigBlueBits(8);
         setConfigAlphaBits(8);
     }

     void testSetUp() override
     {
         constexpr char kVS[] =
             "precision highp float;\n"
             "attribute vec4 position;\n"
             "varying vec2 texcoord;\n"
             "\n"
             "void main()\n"
             "{\n"
             "   gl_Position = vec4(position.xy, 0.0, 1.0);\n"
             "   texcoord = (position.xy * 0.5) + 0.5;\n"
             "}\n";

         constexpr char kFS[] =
             "precision highp float;\n"
             "uniform sampler2D tex;\n"
             "varying vec2 texcoord;\n"
             "\n"
             "void main()\n"
             "{\n"
             "   gl_FragColor = texture2D(tex, texcoord);\n"
             "}\n";

         mProgram = CompileProgram(kVS, kFS);
         ASSERT_NE(0u, mProgram);

         mTextureLocation = glGetUniformLocation(mProgram, "tex");
         ASSERT_NE(-1, mTextureLocation);
     }

     void testTearDown() override { glDeleteProgram(mProgram); }

     GLenum getSRGBA8TextureInternalFormat() const
     {
         return getClientMajorVersion() >= 3 ? GL_SRGB8_ALPHA8 : GL_SRGB_ALPHA_EXT;
     }

     GLenum getSRGBA8TextureFormat() const
     {
         return getClientMajorVersion() >= 3 ? GL_RGBA : GL_SRGB_ALPHA_EXT;
     }

     GLenum getSRGB8TextureInternalFormat() const
     {
         return getClientMajorVersion() >= 3 ? GL_SRGB8 : GL_SRGB_EXT;
     }

     GLenum getSRGB8TextureFormat() const
     {
         return getClientMajorVersion() >= 3 ? GL_RGB : GL_SRGB_EXT;
     }

     GLuint mProgram        = 0;
     GLint mTextureLocation = -1;
 };

 // GenerateMipmaps should generate INVALID_OPERATION in ES 2.0 / WebGL 1.0 with EXT_sRGB.
 // https://bugs.chromium.org/p/chromium/issues/detail?id=769989
 TEST_P(SRGBTextureTest, SRGBValidation)
 {
     // TODO(fjhenigman): Figure out why this fails on Ozone Intel.
     ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

     bool supported = IsGLExtensionEnabled("GL_EXT_sRGB") || getClientMajorVersion() == 3;

     GLuint tex = 0;
     glGenTextures(1, &tex);
     glBindTexture(GL_TEXTURE_2D, tex);

     GLubyte pixel[3] = {0};
     glTexImage2D(GL_TEXTURE_2D, 0, getSRGB8TextureInternalFormat(), 1, 1, 0,
                  getSRGB8TextureFormat(), GL_UNSIGNED_BYTE, pixel);
     if (supported)
     {
         EXPECT_GL_NO_ERROR();

         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, getSRGB8TextureFormat(), GL_UNSIGNED_BYTE,
                         pixel);
         EXPECT_GL_NO_ERROR();

         // Mipmap generation always generates errors for SRGB unsized in ES2 or SRGB8 sized in ES3.
         glGenerateMipmap(GL_TEXTURE_2D);
         EXPECT_GL_ERROR(GL_INVALID_OPERATION);
     }
     else
     {
         EXPECT_GL_ERROR(GL_INVALID_ENUM);
     }

     glDeleteTextures(1, &tex);
 }

 TEST_P(SRGBTextureTest, SRGBAValidation)
 {
     // TODO(fjhenigman): Figure out why this fails on Ozone Intel.
     ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

     bool supported = IsGLExtensionEnabled("GL_EXT_sRGB") || getClientMajorVersion() == 3;

     GLuint tex = 0;
     glGenTextures(1, &tex);
     glBindTexture(GL_TEXTURE_2D, tex);

     GLubyte pixel[4] = {0};
     glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
                  getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, pixel);
     if (supported)
     {
         EXPECT_GL_NO_ERROR();

         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE,
                         pixel);
         EXPECT_GL_NO_ERROR();

         glGenerateMipmap(GL_TEXTURE_2D);
         if (getClientMajorVersion() < 3)
         {
             EXPECT_GL_ERROR(GL_INVALID_OPERATION);
         }
         else
         {
             EXPECT_GL_NO_ERROR();
         }
     }
     else
     {
         EXPECT_GL_ERROR(GL_INVALID_ENUM);
     }

     glDeleteTextures(1, &tex);
 }

 // Test that sized SRGBA formats allow generating mipmaps
 TEST_P(SRGBTextureTest, SRGBASizedValidation)
 {
     // TODO(fjhenigman): Figure out why this fails on Ozone Intel.
     ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

     // ES3 required for sized SRGB textures
     ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

     GLTexture tex;
     glBindTexture(GL_TEXTURE_2D, tex);

     GLubyte pixel[4] = {0};
     glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
                  getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, pixel);

     EXPECT_GL_NO_ERROR();

     glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
     EXPECT_GL_NO_ERROR();

     glGenerateMipmap(GL_TEXTURE_2D);
     EXPECT_GL_NO_ERROR();
 }

 TEST_P(SRGBTextureTest, SRGBARenderbuffer)
 {
     bool supported = IsGLExtensionEnabled("GL_EXT_sRGB") || getClientMajorVersion() == 3;

     GLuint rbo = 0;
     glGenRenderbuffers(1, &rbo);
     glBindRenderbuffer(GL_RENDERBUFFER, rbo);

     glRenderbufferStorage(GL_RENDERBUFFER, GL_SRGB8_ALPHA8_EXT, 1, 1);
     if (supported)
     {
         EXPECT_GL_NO_ERROR();
     }
     else
     {
         EXPECT_GL_ERROR(GL_INVALID_ENUM);

         // Make sure the rbo has a size for future tests
         glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8_OES, 1, 1);
         EXPECT_GL_NO_ERROR();
     }

     GLuint fbo = 0;
     glGenFramebuffers(1, &fbo);
     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
     glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);
     EXPECT_GL_NO_ERROR();

     GLint colorEncoding = 0;
     glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                           GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT,
                                           &colorEncoding);
     if (supported)
     {
         EXPECT_GL_NO_ERROR();
         EXPECT_EQ(GL_SRGB_EXT, colorEncoding);
     }
     else
     {
         EXPECT_GL_ERROR(GL_INVALID_ENUM);
     }

     glDeleteFramebuffers(1, &fbo);
     glDeleteRenderbuffers(1, &rbo);
 }

 // Verify that if the srgb decode extension is available, srgb textures are too
 TEST_P(SRGBTextureTest, SRGBDecodeExtensionAvailability)
 {
     bool hasSRGBDecode = IsGLExtensionEnabled("GL_EXT_texture_sRGB_decode");
     if (hasSRGBDecode)
     {
         bool hasSRGBTextures = IsGLExtensionEnabled("GL_EXT_sRGB") || getClientMajorVersion() >= 3;
         EXPECT_TRUE(hasSRGBTextures);
     }
 }

 // Test basic functionality of SRGB decode using the texture parameter
 TEST_P(SRGBTextureTest, SRGBDecodeTextureParameter)
 {
     // TODO(fjhenigman): Figure out why this fails on Ozone Intel.
     ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

     ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_decode"));

     GLColor linearColor = kLinearColor;
     GLColor srgbColor   = kNonlinearColor;

     GLTexture tex;
     glBindTexture(GL_TEXTURE_2D, tex.get());
     glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
                  getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, &linearColor);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SRGB_DECODE_EXT, GL_DECODE_EXT);
     ASSERT_GL_NO_ERROR();

     glUseProgram(mProgram);
     glUniform1i(mTextureLocation, 0);

     glDisable(GL_DEPTH_TEST);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);

     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SRGB_DECODE_EXT, GL_SKIP_DECODE_EXT);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, linearColor, 1.0);
 }

 // Test basic functionality of SRGB override using the texture parameter
 TEST_P(SRGBTextureTest, SRGBOverrideTextureParameter)
 {
     ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_override"));

     GLColor linearColor = kLinearColor;
     GLColor srgbColor   = kNonlinearColor;

     GLenum internalFormat = getClientMajorVersion() >= 3 ? GL_RGBA8 : GL_RGBA;

     GLTexture tex;
     glBindTexture(GL_TEXTURE_2D, tex.get());
     glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  &linearColor);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_NONE);
     ASSERT_GL_NO_ERROR();

     glUseProgram(mProgram);
     glUniform1i(mTextureLocation, 0);

     glDisable(GL_DEPTH_TEST);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, linearColor, 1.0);

     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_SRGB);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);
 }

 // Test that SRGB override is a noop when used on a nonlinear texture format
 // EXT_texture_format_sRGB_override spec says:
 // "If the internal format is not one of the above formats, then
 // the value of TEXTURE_FORMAT_SRGB_OVERRIDE_EXT is ignored."
 TEST_P(SRGBTextureTest, SRGBOverrideTextureParameterNoop)
 {
     ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_override"));
     ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_sRGB") || getClientMajorVersion() < 3);

     GLColor linearColor = kLinearColor;
     GLColor srgbColor   = kNonlinearColor;

     GLTexture tex;
     glBindTexture(GL_TEXTURE_2D, tex.get());
     glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
                  getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, &linearColor);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_NONE);
     ASSERT_GL_NO_ERROR();

     glUseProgram(mProgram);
     glUniform1i(mTextureLocation, 0);

     glDisable(GL_DEPTH_TEST);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);

     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_SRGB);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);
 }

 // Test basic functionality of SRGB decode using the sampler parameter
 TEST_P(SRGBTextureTest, SRGBDecodeSamplerParameter)
 {
     ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_decode") ||
                        getClientMajorVersion() < 3);

     GLColor linearColor = kLinearColor;
     GLColor srgbColor   = kNonlinearColor;

     GLTexture tex;
     glBindTexture(GL_TEXTURE_2D, tex.get());
     glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
                  getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, &linearColor);
     ASSERT_GL_NO_ERROR();

     GLSampler sampler;
     glBindSampler(0, sampler.get());
     glSamplerParameteri(sampler.get(), GL_TEXTURE_SRGB_DECODE_EXT, GL_DECODE_EXT);

     glUseProgram(mProgram);
     glUniform1i(mTextureLocation, 0);

     glDisable(GL_DEPTH_TEST);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);

     glSamplerParameteri(sampler.get(), GL_TEXTURE_SRGB_DECODE_EXT, GL_SKIP_DECODE_EXT);
     drawQuad(mProgram, "position", 0.5f);

     EXPECT_PIXEL_COLOR_NEAR(0, 0, linearColor, 1.0);
 }

 // Test that mipmaps are generated correctly for sRGB textures
 TEST_P(SRGBTextureTest, GenerateMipmaps)
 {
     ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

     ANGLE_SKIP_TEST_IF(IsOpenGL() && ((IsIntel() && IsOSX()) || IsAMD()));

     auto createAndReadBackTexture = [this](GLenum internalFormat, const GLColor &color) {
         constexpr GLsizei width  = 128;
         constexpr GLsizei height = 128;

         std::array<GLColor, width * height> buf;
         std::fill(buf.begin(), buf.end(), color);

         // Set up-left region of the texture as red color.
         // In order to make sure bi-linear interpolation operates on different colors, red region
         // is 1 pixel smaller than a quarter of the full texture on each side.
         constexpr GLsizei redWidth  = width / 2 - 1;
         constexpr GLsizei redHeight = height / 2 - 1;
         std::array<GLColor, redWidth * redHeight> redBuf;
         std::fill(redBuf.begin(), redBuf.end(), GLColor::red);

         GLTexture tex;
         glBindTexture(GL_TEXTURE_2D, tex.get());
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
         glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                      buf.data());
         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, redWidth, redHeight, GL_RGBA, GL_UNSIGNED_BYTE,
                         redBuf.data());
         glGenerateMipmap(GL_TEXTURE_2D);

         constexpr GLsizei drawWidth  = 32;
         constexpr GLsizei drawHeight = 32;
         glViewport(0, 0, drawWidth, drawHeight);

         drawQuad(mProgram, "position", 0.5f);

         std::array<GLColor, drawWidth * drawHeight> result;
         glReadPixels(0, 0, drawWidth, drawHeight, GL_RGBA, GL_UNSIGNED_BYTE, result.data());

         EXPECT_GL_NO_ERROR();

         return result;
     };

     GLColor srgbaColor(0, 63, 127, 255);
     auto srgbaReadback = createAndReadBackTexture(GL_SRGB8_ALPHA8, srgbaColor);

     GLColor linearColor(0, 13, 54, 255);
     auto rgbaReadback = createAndReadBackTexture(GL_RGBA8, linearColor);

     ASSERT_EQ(srgbaReadback.size(), rgbaReadback.size());
     for (size_t i = 0; i < srgbaReadback.size(); i++)
     {
         constexpr double tolerence = 7.0;
         EXPECT_COLOR_NEAR(srgbaReadback[i], rgbaReadback[i], tolerence);
     }
 }

 // Use this to select which configurations (e.g. which renderer, which GLES major version) these
 // tests should be run against.
 ANGLE_INSTANTIATE_TEST_ES2_AND_ES3(SRGBTextureTest);

 }  // namespace angle
	//
	// Copyright 2015 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.
	//

	#include "test_utils/ANGLETest.h"
	#include "test_utils/gl_raii.h"

	namespace angle
	{

	// These two colors are equivelent in different colorspaces
	constexpr GLColor kLinearColor(64, 127, 191, 255);
	constexpr GLColor kNonlinearColor(13, 54, 133, 255);

	class SRGBTextureTest : public ANGLETest
	{
	protected:
	SRGBTextureTest()
	{
	setWindowWidth(128);
	setWindowHeight(128);
	setConfigRedBits(8);
	setConfigGreenBits(8);
	setConfigBlueBits(8);
	setConfigAlphaBits(8);
	}

	void testSetUp() override
	{
	constexpr char kVS[] =
	"precision highp float;\n"
	"attribute vec4 position;\n"
	"varying vec2 texcoord;\n"
	"\n"
	"void main()\n"
	"{\n"
	" gl_Position = vec4(position.xy, 0.0, 1.0);\n"
	" texcoord = (position.xy * 0.5) + 0.5;\n"
	"}\n";

	constexpr char kFS[] =
	"precision highp float;\n"
	"uniform sampler2D tex;\n"
	"varying vec2 texcoord;\n"
	"\n"
	"void main()\n"
	"{\n"
	" gl_FragColor = texture2D(tex, texcoord);\n"
	"}\n";

	mProgram = CompileProgram(kVS, kFS);
	ASSERT_NE(0u, mProgram);

	mTextureLocation = glGetUniformLocation(mProgram, "tex");
	ASSERT_NE(-1, mTextureLocation);
	}

	void testTearDown() override { glDeleteProgram(mProgram); }

	GLenum getSRGBA8TextureInternalFormat() const
	{
	return getClientMajorVersion() >= 3 ? GL_SRGB8_ALPHA8 : GL_SRGB_ALPHA_EXT;
	}

	GLenum getSRGBA8TextureFormat() const
	{
	return getClientMajorVersion() >= 3 ? GL_RGBA : GL_SRGB_ALPHA_EXT;
	}

	GLenum getSRGB8TextureInternalFormat() const
	{
	return getClientMajorVersion() >= 3 ? GL_SRGB8 : GL_SRGB_EXT;
	}

	GLenum getSRGB8TextureFormat() const
	{
	return getClientMajorVersion() >= 3 ? GL_RGB : GL_SRGB_EXT;
	}

	GLuint mProgram = 0;
	GLint mTextureLocation = -1;
	};

	// GenerateMipmaps should generate INVALID_OPERATION in ES 2.0 / WebGL 1.0 with EXT_sRGB.
	// https://bugs.chromium.org/p/chromium/issues/detail?id=769989
	TEST_P(SRGBTextureTest, SRGBValidation)
	{
	// TODO(fjhenigman): Figure out why this fails on Ozone Intel.
	ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

	bool supported = IsGLExtensionEnabled("GL_EXT_sRGB") \|\| getClientMajorVersion() == 3;

	GLuint tex = 0;
	glGenTextures(1, &tex);
	glBindTexture(GL_TEXTURE_2D, tex);

	GLubyte pixel[3] = {0};
	glTexImage2D(GL_TEXTURE_2D, 0, getSRGB8TextureInternalFormat(), 1, 1, 0,
	getSRGB8TextureFormat(), GL_UNSIGNED_BYTE, pixel);
	if (supported)
	{
	EXPECT_GL_NO_ERROR();

	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, getSRGB8TextureFormat(), GL_UNSIGNED_BYTE,
	pixel);
	EXPECT_GL_NO_ERROR();

	// Mipmap generation always generates errors for SRGB unsized in ES2 or SRGB8 sized in ES3.
	glGenerateMipmap(GL_TEXTURE_2D);
	EXPECT_GL_ERROR(GL_INVALID_OPERATION);
	}
	else
	{
	EXPECT_GL_ERROR(GL_INVALID_ENUM);
	}

	glDeleteTextures(1, &tex);
	}

	TEST_P(SRGBTextureTest, SRGBAValidation)
	{
	// TODO(fjhenigman): Figure out why this fails on Ozone Intel.
	ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

	bool supported = IsGLExtensionEnabled("GL_EXT_sRGB") \|\| getClientMajorVersion() == 3;

	GLuint tex = 0;
	glGenTextures(1, &tex);
	glBindTexture(GL_TEXTURE_2D, tex);

	GLubyte pixel[4] = {0};
	glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
	getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, pixel);
	if (supported)
	{
	EXPECT_GL_NO_ERROR();

	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE,
	pixel);
	EXPECT_GL_NO_ERROR();

	glGenerateMipmap(GL_TEXTURE_2D);
	if (getClientMajorVersion() < 3)
	{
	EXPECT_GL_ERROR(GL_INVALID_OPERATION);
	}
	else
	{
	EXPECT_GL_NO_ERROR();
	}
	}
	else
	{
	EXPECT_GL_ERROR(GL_INVALID_ENUM);
	}

	glDeleteTextures(1, &tex);
	}

	// Test that sized SRGBA formats allow generating mipmaps
	TEST_P(SRGBTextureTest, SRGBASizedValidation)
	{
	// TODO(fjhenigman): Figure out why this fails on Ozone Intel.
	ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

	// ES3 required for sized SRGB textures
	ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

	GLTexture tex;
	glBindTexture(GL_TEXTURE_2D, tex);

	GLubyte pixel[4] = {0};
	glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
	getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, pixel);

	EXPECT_GL_NO_ERROR();

	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
	EXPECT_GL_NO_ERROR();

	glGenerateMipmap(GL_TEXTURE_2D);
	EXPECT_GL_NO_ERROR();
	}

	TEST_P(SRGBTextureTest, SRGBARenderbuffer)
	{
	bool supported = IsGLExtensionEnabled("GL_EXT_sRGB") \|\| getClientMajorVersion() == 3;

	GLuint rbo = 0;
	glGenRenderbuffers(1, &rbo);
	glBindRenderbuffer(GL_RENDERBUFFER, rbo);

	glRenderbufferStorage(GL_RENDERBUFFER, GL_SRGB8_ALPHA8_EXT, 1, 1);
	if (supported)
	{
	EXPECT_GL_NO_ERROR();
	}
	else
	{
	EXPECT_GL_ERROR(GL_INVALID_ENUM);

	// Make sure the rbo has a size for future tests
	glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8_OES, 1, 1);
	EXPECT_GL_NO_ERROR();
	}

	GLuint fbo = 0;
	glGenFramebuffers(1, &fbo);
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);
	EXPECT_GL_NO_ERROR();

	GLint colorEncoding = 0;
	glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
	GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT,
	&colorEncoding);
	if (supported)
	{
	EXPECT_GL_NO_ERROR();
	EXPECT_EQ(GL_SRGB_EXT, colorEncoding);
	}
	else
	{
	EXPECT_GL_ERROR(GL_INVALID_ENUM);
	}

	glDeleteFramebuffers(1, &fbo);
	glDeleteRenderbuffers(1, &rbo);
	}

	// Verify that if the srgb decode extension is available, srgb textures are too
	TEST_P(SRGBTextureTest, SRGBDecodeExtensionAvailability)
	{
	bool hasSRGBDecode = IsGLExtensionEnabled("GL_EXT_texture_sRGB_decode");
	if (hasSRGBDecode)
	{
	bool hasSRGBTextures = IsGLExtensionEnabled("GL_EXT_sRGB") \|\| getClientMajorVersion() >= 3;
	EXPECT_TRUE(hasSRGBTextures);
	}
	}

	// Test basic functionality of SRGB decode using the texture parameter
	TEST_P(SRGBTextureTest, SRGBDecodeTextureParameter)
	{
	// TODO(fjhenigman): Figure out why this fails on Ozone Intel.
	ANGLE_SKIP_TEST_IF(IsOzone() && IsIntel() && IsOpenGLES());

	ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_decode"));

	GLColor linearColor = kLinearColor;
	GLColor srgbColor = kNonlinearColor;

	GLTexture tex;
	glBindTexture(GL_TEXTURE_2D, tex.get());
	glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
	getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, &linearColor);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SRGB_DECODE_EXT, GL_DECODE_EXT);
	ASSERT_GL_NO_ERROR();

	glUseProgram(mProgram);
	glUniform1i(mTextureLocation, 0);

	glDisable(GL_DEPTH_TEST);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SRGB_DECODE_EXT, GL_SKIP_DECODE_EXT);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, linearColor, 1.0);
	}

	// Test basic functionality of SRGB override using the texture parameter
	TEST_P(SRGBTextureTest, SRGBOverrideTextureParameter)
	{
	ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_override"));

	GLColor linearColor = kLinearColor;
	GLColor srgbColor = kNonlinearColor;

	GLenum internalFormat = getClientMajorVersion() >= 3 ? GL_RGBA8 : GL_RGBA;

	GLTexture tex;
	glBindTexture(GL_TEXTURE_2D, tex.get());
	glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	&linearColor);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_NONE);
	ASSERT_GL_NO_ERROR();

	glUseProgram(mProgram);
	glUniform1i(mTextureLocation, 0);

	glDisable(GL_DEPTH_TEST);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, linearColor, 1.0);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_SRGB);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);
	}

	// Test that SRGB override is a noop when used on a nonlinear texture format
	// EXT_texture_format_sRGB_override spec says:
	// "If the internal format is not one of the above formats, then
	// the value of TEXTURE_FORMAT_SRGB_OVERRIDE_EXT is ignored."
	TEST_P(SRGBTextureTest, SRGBOverrideTextureParameterNoop)
	{
	ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_override"));
	ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_sRGB") \|\| getClientMajorVersion() < 3);

	GLColor linearColor = kLinearColor;
	GLColor srgbColor = kNonlinearColor;

	GLTexture tex;
	glBindTexture(GL_TEXTURE_2D, tex.get());
	glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
	getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, &linearColor);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_NONE);
	ASSERT_GL_NO_ERROR();

	glUseProgram(mProgram);
	glUniform1i(mTextureLocation, 0);

	glDisable(GL_DEPTH_TEST);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_SRGB);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);
	}

	// Test basic functionality of SRGB decode using the sampler parameter
	TEST_P(SRGBTextureTest, SRGBDecodeSamplerParameter)
	{
	ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_sRGB_decode") \|\|
	getClientMajorVersion() < 3);

	GLColor linearColor = kLinearColor;
	GLColor srgbColor = kNonlinearColor;

	GLTexture tex;
	glBindTexture(GL_TEXTURE_2D, tex.get());
	glTexImage2D(GL_TEXTURE_2D, 0, getSRGBA8TextureInternalFormat(), 1, 1, 0,
	getSRGBA8TextureFormat(), GL_UNSIGNED_BYTE, &linearColor);
	ASSERT_GL_NO_ERROR();

	GLSampler sampler;
	glBindSampler(0, sampler.get());
	glSamplerParameteri(sampler.get(), GL_TEXTURE_SRGB_DECODE_EXT, GL_DECODE_EXT);

	glUseProgram(mProgram);
	glUniform1i(mTextureLocation, 0);

	glDisable(GL_DEPTH_TEST);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, srgbColor, 1.0);

	glSamplerParameteri(sampler.get(), GL_TEXTURE_SRGB_DECODE_EXT, GL_SKIP_DECODE_EXT);
	drawQuad(mProgram, "position", 0.5f);

	EXPECT_PIXEL_COLOR_NEAR(0, 0, linearColor, 1.0);
	}

	// Test that mipmaps are generated correctly for sRGB textures
	TEST_P(SRGBTextureTest, GenerateMipmaps)
	{
	ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

	ANGLE_SKIP_TEST_IF(IsOpenGL() && ((IsIntel() && IsOSX()) \|\| IsAMD()));

	auto createAndReadBackTexture = [this](GLenum internalFormat, const GLColor &color) {
	constexpr GLsizei width = 128;
	constexpr GLsizei height = 128;

	std::array<GLColor, width * height> buf;
	std::fill(buf.begin(), buf.end(), color);

	// Set up-left region of the texture as red color.
	// In order to make sure bi-linear interpolation operates on different colors, red region
	// is 1 pixel smaller than a quarter of the full texture on each side.
	constexpr GLsizei redWidth = width / 2 - 1;
	constexpr GLsizei redHeight = height / 2 - 1;
	std::array<GLColor, redWidth * redHeight> redBuf;
	std::fill(redBuf.begin(), redBuf.end(), GLColor::red);

	GLTexture tex;
	glBindTexture(GL_TEXTURE_2D, tex.get());
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
	glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	buf.data());
	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, redWidth, redHeight, GL_RGBA, GL_UNSIGNED_BYTE,
	redBuf.data());
	glGenerateMipmap(GL_TEXTURE_2D);

	constexpr GLsizei drawWidth = 32;
	constexpr GLsizei drawHeight = 32;
	glViewport(0, 0, drawWidth, drawHeight);

	drawQuad(mProgram, "position", 0.5f);

	std::array<GLColor, drawWidth * drawHeight> result;
	glReadPixels(0, 0, drawWidth, drawHeight, GL_RGBA, GL_UNSIGNED_BYTE, result.data());

	EXPECT_GL_NO_ERROR();

	return result;
	};

	GLColor srgbaColor(0, 63, 127, 255);
	auto srgbaReadback = createAndReadBackTexture(GL_SRGB8_ALPHA8, srgbaColor);

	GLColor linearColor(0, 13, 54, 255);
	auto rgbaReadback = createAndReadBackTexture(GL_RGBA8, linearColor);

	ASSERT_EQ(srgbaReadback.size(), rgbaReadback.size());
	for (size_t i = 0; i < srgbaReadback.size(); i++)
	{
	constexpr double tolerence = 7.0;
	EXPECT_COLOR_NEAR(srgbaReadback[i], rgbaReadback[i], tolerence);
	}
	}

	// Use this to select which configurations (e.g. which renderer, which GLES major version) these
	// tests should be run against.
	ANGLE_INSTANTIATE_TEST_ES2_AND_ES3(SRGBTextureTest);

	} // namespace angle