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

 //
 // 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.
 //

 // TextureRectangleTest: Tests of GL_ANGLE_texture_rectangle

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

 using namespace angle;

 namespace
 {

 class TextureRectangleTest : public ANGLETest
 {
   protected:
     TextureRectangleTest()
     {
         setWindowWidth(64);
         setWindowHeight(64);
         setConfigRedBits(8);
         setConfigGreenBits(8);
         setConfigBlueBits(8);
         setConfigAlphaBits(8);
     }

     bool checkExtensionSupported() const
     {
         if (!IsGLExtensionEnabled("GL_ANGLE_texture_rectangle"))
         {
             std::cout << "Test skipped because GL_ANGLE_texture_rectangle is not available."
                       << std::endl;
             return false;
         }
         return true;
     }
 };

 class TextureRectangleTestES3 : public TextureRectangleTest
 {};

 class TextureRectangleTestES31 : public TextureRectangleTest
 {};

 // Test using TexImage2D to define a rectangle texture
 TEST_P(TextureRectangleTest, TexImage2D)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

     // Defining level 0 is allowed
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  nullptr);
     ASSERT_GL_NO_ERROR();

     // Defining level other than 0 is not allowed
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  nullptr);
     ASSERT_GL_ERROR(GL_INVALID_VALUE);

     GLint maxSize = 0;
     glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_ANGLE, &maxSize);

     // Defining a texture of the max size is allowed
     {
         ScopedIgnorePlatformMessages ignore;

         glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, maxSize, maxSize, 0, GL_RGBA,
                      GL_UNSIGNED_BYTE, nullptr);
         GLenum error = glGetError();
         ASSERT_TRUE(error == GL_NO_ERROR || error == GL_OUT_OF_MEMORY);
     }

     // Defining a texture of the max size is allowed
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, maxSize + 1, maxSize, 0, GL_RGBA,
                  GL_UNSIGNED_BYTE, nullptr);
     ASSERT_GL_ERROR(GL_INVALID_VALUE);
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, maxSize, maxSize + 1, 0, GL_RGBA,
                  GL_UNSIGNED_BYTE, nullptr);
     ASSERT_GL_ERROR(GL_INVALID_VALUE);
 }

 // Test using CompressedTexImage2D cannot be used on a retangle texture
 TEST_P(TextureRectangleTest, CompressedTexImage2DDisallowed)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());
     ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_compression_dxt1"));

     const char data[128] = {0};

     // Control case: 2D texture
     {
         GLTexture tex;
         glBindTexture(GL_TEXTURE_2D, tex);
         glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16, 16, 0, 128,
                                data);
         ASSERT_GL_NO_ERROR();
     }

     // Rectangle textures cannot be compressed
     {
         GLTexture tex;
         glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
         glCompressedTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16,
                                16, 0, 128, data);
         ASSERT_GL_ERROR(GL_INVALID_ENUM);
     }
 }

 // Test using TexStorage2D to define a rectangle texture
 TEST_P(TextureRectangleTest, TexStorage2D)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());
     ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                        !IsGLExtensionEnabled("GL_EXT_texture_storage"));

     bool useES3       = getClientMajorVersion() >= 3;
     auto TexStorage2D = [useES3](GLenum target, GLint levels, GLenum format, GLint width,
                                  GLint height) {
         if (useES3)
         {
             glTexStorage2D(target, levels, format, width, height);
         }
         else
         {
             glTexStorage2DEXT(target, levels, format, width, height);
         }
     };

     // Defining one level is allowed
     {
         GLTexture tex;
         glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
         TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, 16, 16);
         ASSERT_GL_NO_ERROR();
     }

     // Having more than one level is not allowed
     {
         GLTexture tex;
         glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
         // Use 5 levels because the EXT_texture_storage extension requires a mip chain all the way
         // to a 1x1 mip.
         TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 5, GL_RGBA8UI, 16, 16);
         ASSERT_GL_ERROR(GL_INVALID_VALUE);
     }

     GLint maxSize = 0;
     glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_ANGLE, &maxSize);

     // Defining a texture of the max size is allowed but still allow for OOM
     {
         ScopedIgnorePlatformMessages ignore;

         GLTexture tex;
         glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
         TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, maxSize, maxSize);
         GLenum error = glGetError();
         ASSERT_TRUE(error == GL_NO_ERROR || error == GL_OUT_OF_MEMORY);
     }

     // Defining a texture of the max size is disallowed
     {
         GLTexture tex;
         glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
         TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, maxSize + 1, maxSize);
         ASSERT_GL_ERROR(GL_INVALID_VALUE);
         TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, maxSize, maxSize + 1);
         ASSERT_GL_ERROR(GL_INVALID_VALUE);
     }

     // Compressed formats are disallowed
     if (IsGLExtensionEnabled("GL_EXT_texture_compression_dxt1"))
     {
         GLTexture tex;
         glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
         TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16, 16);
         ASSERT_GL_ERROR(GL_INVALID_ENUM);
     }
 }

 // Test validation of disallowed texture parameters
 TEST_P(TextureRectangleTest, TexParameterRestriction)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

     // Only wrap mode CLAMP_TO_EDGE is supported
     // Wrap S
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     ASSERT_GL_NO_ERROR();
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, GL_REPEAT);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);

     // Wrap T
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     ASSERT_GL_NO_ERROR();
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, GL_REPEAT);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);

     // Min filter has to be nearest or linear
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     ASSERT_GL_NO_ERROR();
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     ASSERT_GL_NO_ERROR();
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);
     glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
     ASSERT_GL_ERROR(GL_INVALID_ENUM);

     // Base level has to be 0
     if (getClientMajorVersion() >= 3)
     {
         glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_BASE_LEVEL, 0);
         ASSERT_GL_NO_ERROR();
         glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_BASE_LEVEL, 1);
         ASSERT_GL_ERROR(GL_INVALID_OPERATION);
     }
 }

 // Test validation of 'level' in GetTexParameter
 TEST_P(TextureRectangleTestES31, GetTexLevelParameter)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  nullptr);
     ASSERT_GL_NO_ERROR();

     GLint param;
     // Control case: level 0 is ok.
     glGetTexLevelParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_TEXTURE_INTERNAL_FORMAT, &param);
     ASSERT_GL_NO_ERROR();

     // Level 1 is not ok.
     glGetTexLevelParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_TEXTURE_INTERNAL_FORMAT, &param);
     ASSERT_GL_ERROR(GL_INVALID_VALUE);
 }

 // Test validation of "level" in FramebufferTexture2D
 TEST_P(TextureRectangleTest, FramebufferTexture2DLevel)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  nullptr);
     ASSERT_GL_NO_ERROR();

     GLFramebuffer fbo;
     glBindFramebuffer(GL_FRAMEBUFFER, fbo);

     // Using level 0 of a rectangle texture is valid.
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
                            0);
     EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
     ASSERT_GL_NO_ERROR();

     // Setting level != 0 is invalid
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
                            1);
     ASSERT_GL_ERROR(GL_INVALID_VALUE);
 }

 // Test sampling from a rectangle texture using texture2DRect in ESSL1
 TEST_P(TextureRectangleTest, SamplingFromRectangleESSL1)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  &GLColor::green);

     constexpr char kFS[] =
         "#extension GL_ARB_texture_rectangle : require\n"
         "precision mediump float;\n"
         "uniform sampler2DRect tex;\n"
         "void main()\n"
         "{\n"
         "    gl_FragColor = texture2DRect(tex, vec2(0, 0));\n"
         "}\n";

     ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), kFS);
     glUseProgram(program);

     GLint location = glGetUniformLocation(program, "tex");
     ASSERT_NE(-1, location);
     glUniform1i(location, 0);

     glClearColor(0.0, 0.0, 0.0, 0.0);
     glClear(GL_COLOR_BUFFER_BIT);
     drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f, 1.0f, false);
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
     ASSERT_GL_NO_ERROR();
 }

 // Test sampling from a rectangle texture using the texture overload in ESSL3
 TEST_P(TextureRectangleTestES3, SamplingFromRectangleESSL3)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  &GLColor::green);

     constexpr char kFS[] =
         "#version 300 es\n"
         "#extension GL_ARB_texture_rectangle : require\n"
         "precision mediump float;\n"
         "uniform sampler2DRect tex;\n"
         "out vec4 fragColor;\n"
         "void main()\n"
         "{\n"
         "    fragColor = texture(tex, vec2(0, 0));\n"
         "}\n";

     ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
     glUseProgram(program);

     GLint location = glGetUniformLocation(program, "tex");
     ASSERT_NE(-1, location);
     glUniform1i(location, 0);

     glClearColor(0.0, 0.0, 0.0, 0.0);
     glClear(GL_COLOR_BUFFER_BIT);
     drawQuad(program, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, false);
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
     ASSERT_GL_NO_ERROR();
 }

 // Test attaching a rectangle texture and rendering to it.
 TEST_P(TextureRectangleTest, RenderToRectangle)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  &GLColor::black);

     GLFramebuffer fbo;
     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
                            0);
     EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
     ASSERT_GL_NO_ERROR();

     // Clearing a texture is just as good as checking we can render to it, right?
     glClearColor(0.0, 1.0, 0.0, 1.0);
     glClear(GL_COLOR_BUFFER_BIT);
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
     ASSERT_GL_NO_ERROR();
 }

 TEST_P(TextureRectangleTest, DefaultSamplerParameters)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

     GLint minFilter = 0;
     glGetTexParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, &minFilter);
     EXPECT_EQ(GL_LINEAR, minFilter);

     GLint wrapS = 0;
     glGetTexParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, &wrapS);
     EXPECT_EQ(GL_CLAMP_TO_EDGE, wrapS);

     GLint wrapT = 0;
     glGetTexParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, &wrapT);
     EXPECT_EQ(GL_CLAMP_TO_EDGE, wrapT);
 }

 // Test glCopyTexImage with rectangle textures
 TEST_P(TextureRectangleTestES3, CopyTexImage)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

     glBindFramebuffer(GL_FRAMEBUFFER, 0);
     glClearColor(0, 1, 0, 1);
     glClear(GL_COLOR_BUFFER_BIT);
     ASSERT_GL_NO_ERROR();

     // Error case: level != 0
     glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8, 0, 0, 1, 1, 0);
     ASSERT_GL_ERROR(GL_INVALID_VALUE);

     // level = 0 works and defines the texture.
     glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA8, 0, 0, 1, 1, 0);
     ASSERT_GL_NO_ERROR();

     GLFramebuffer fbo;
     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
                            0);
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
     ASSERT_GL_NO_ERROR();
 }

 // Test glCopyTexSubImage with rectangle textures
 TEST_P(TextureRectangleTestES3, CopyTexSubImage)
 {
     ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

     GLTexture tex;
     glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
     glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                  &GLColor::black);

     glBindFramebuffer(GL_FRAMEBUFFER, 0);
     glClearColor(0, 1, 0, 1);
     glClear(GL_COLOR_BUFFER_BIT);
     ASSERT_GL_NO_ERROR();

     // Error case: level != 0
     glCopyTexSubImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, 0, 0, 0, 0, 1, 1);
     ASSERT_GL_ERROR(GL_INVALID_VALUE);

     // level = 0 works and defines the texture.
     glCopyTexSubImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, 0, 0, 0, 0, 1, 1);
     ASSERT_GL_NO_ERROR();

     GLFramebuffer fbo;
     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
                            0);
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
     ASSERT_GL_NO_ERROR();
 }

 ANGLE_INSTANTIATE_TEST_ES2(TextureRectangleTest);
 ANGLE_INSTANTIATE_TEST_ES3(TextureRectangleTestES3);
 ANGLE_INSTANTIATE_TEST_ES31(TextureRectangleTestES31);
 }  // anonymous namespace
	//
	// 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.
	//

	// TextureRectangleTest: Tests of GL_ANGLE_texture_rectangle

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

	using namespace angle;

	namespace
	{

	class TextureRectangleTest : public ANGLETest
	{
	protected:
	TextureRectangleTest()
	{
	setWindowWidth(64);
	setWindowHeight(64);
	setConfigRedBits(8);
	setConfigGreenBits(8);
	setConfigBlueBits(8);
	setConfigAlphaBits(8);
	}

	bool checkExtensionSupported() const
	{
	if (!IsGLExtensionEnabled("GL_ANGLE_texture_rectangle"))
	{
	std::cout << "Test skipped because GL_ANGLE_texture_rectangle is not available."
	<< std::endl;
	return false;
	}
	return true;
	}
	};

	class TextureRectangleTestES3 : public TextureRectangleTest
	{};

	class TextureRectangleTestES31 : public TextureRectangleTest
	{};

	// Test using TexImage2D to define a rectangle texture
	TEST_P(TextureRectangleTest, TexImage2D)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

	// Defining level 0 is allowed
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	nullptr);
	ASSERT_GL_NO_ERROR();

	// Defining level other than 0 is not allowed
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	nullptr);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);

	GLint maxSize = 0;
	glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_ANGLE, &maxSize);

	// Defining a texture of the max size is allowed
	{
	ScopedIgnorePlatformMessages ignore;

	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, maxSize, maxSize, 0, GL_RGBA,
	GL_UNSIGNED_BYTE, nullptr);
	GLenum error = glGetError();
	ASSERT_TRUE(error == GL_NO_ERROR \|\| error == GL_OUT_OF_MEMORY);
	}

	// Defining a texture of the max size is allowed
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, maxSize + 1, maxSize, 0, GL_RGBA,
	GL_UNSIGNED_BYTE, nullptr);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, maxSize, maxSize + 1, 0, GL_RGBA,
	GL_UNSIGNED_BYTE, nullptr);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);
	}

	// Test using CompressedTexImage2D cannot be used on a retangle texture
	TEST_P(TextureRectangleTest, CompressedTexImage2DDisallowed)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());
	ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_compression_dxt1"));

	const char data[128] = {0};

	// Control case: 2D texture
	{
	GLTexture tex;
	glBindTexture(GL_TEXTURE_2D, tex);
	glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16, 16, 0, 128,
	data);
	ASSERT_GL_NO_ERROR();
	}

	// Rectangle textures cannot be compressed
	{
	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	glCompressedTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16,
	16, 0, 128, data);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);
	}
	}

	// Test using TexStorage2D to define a rectangle texture
	TEST_P(TextureRectangleTest, TexStorage2D)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());
	ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
	!IsGLExtensionEnabled("GL_EXT_texture_storage"));

	bool useES3 = getClientMajorVersion() >= 3;
	auto TexStorage2D = [useES3](GLenum target, GLint levels, GLenum format, GLint width,
	GLint height) {
	if (useES3)
	{
	glTexStorage2D(target, levels, format, width, height);
	}
	else
	{
	glTexStorage2DEXT(target, levels, format, width, height);
	}
	};

	// Defining one level is allowed
	{
	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, 16, 16);
	ASSERT_GL_NO_ERROR();
	}

	// Having more than one level is not allowed
	{
	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	// Use 5 levels because the EXT_texture_storage extension requires a mip chain all the way
	// to a 1x1 mip.
	TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 5, GL_RGBA8UI, 16, 16);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);
	}

	GLint maxSize = 0;
	glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_ANGLE, &maxSize);

	// Defining a texture of the max size is allowed but still allow for OOM
	{
	ScopedIgnorePlatformMessages ignore;

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, maxSize, maxSize);
	GLenum error = glGetError();
	ASSERT_TRUE(error == GL_NO_ERROR \|\| error == GL_OUT_OF_MEMORY);
	}

	// Defining a texture of the max size is disallowed
	{
	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, maxSize + 1, maxSize);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);
	TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8UI, maxSize, maxSize + 1);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);
	}

	// Compressed formats are disallowed
	if (IsGLExtensionEnabled("GL_EXT_texture_compression_dxt1"))
	{
	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	TexStorage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16, 16);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);
	}
	}

	// Test validation of disallowed texture parameters
	TEST_P(TextureRectangleTest, TexParameterRestriction)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

	// Only wrap mode CLAMP_TO_EDGE is supported
	// Wrap S
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	ASSERT_GL_NO_ERROR();
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, GL_REPEAT);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);

	// Wrap T
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	ASSERT_GL_NO_ERROR();
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, GL_REPEAT);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);

	// Min filter has to be nearest or linear
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	ASSERT_GL_NO_ERROR();
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	ASSERT_GL_NO_ERROR();
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	ASSERT_GL_ERROR(GL_INVALID_ENUM);

	// Base level has to be 0
	if (getClientMajorVersion() >= 3)
	{
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_BASE_LEVEL, 0);
	ASSERT_GL_NO_ERROR();
	glTexParameteri(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_BASE_LEVEL, 1);
	ASSERT_GL_ERROR(GL_INVALID_OPERATION);
	}
	}

	// Test validation of 'level' in GetTexParameter
	TEST_P(TextureRectangleTestES31, GetTexLevelParameter)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	nullptr);
	ASSERT_GL_NO_ERROR();

	GLint param;
	// Control case: level 0 is ok.
	glGetTexLevelParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_TEXTURE_INTERNAL_FORMAT, &param);
	ASSERT_GL_NO_ERROR();

	// Level 1 is not ok.
	glGetTexLevelParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_TEXTURE_INTERNAL_FORMAT, &param);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);
	}

	// Test validation of "level" in FramebufferTexture2D
	TEST_P(TextureRectangleTest, FramebufferTexture2DLevel)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	nullptr);
	ASSERT_GL_NO_ERROR();

	GLFramebuffer fbo;
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);

	// Using level 0 of a rectangle texture is valid.
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
	0);
	EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
	ASSERT_GL_NO_ERROR();

	// Setting level != 0 is invalid
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
	1);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);
	}

	// Test sampling from a rectangle texture using texture2DRect in ESSL1
	TEST_P(TextureRectangleTest, SamplingFromRectangleESSL1)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	&GLColor::green);

	constexpr char kFS[] =
	"#extension GL_ARB_texture_rectangle : require\n"
	"precision mediump float;\n"
	"uniform sampler2DRect tex;\n"
	"void main()\n"
	"{\n"
	" gl_FragColor = texture2DRect(tex, vec2(0, 0));\n"
	"}\n";

	ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), kFS);
	glUseProgram(program);

	GLint location = glGetUniformLocation(program, "tex");
	ASSERT_NE(-1, location);
	glUniform1i(location, 0);

	glClearColor(0.0, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT);
	drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f, 1.0f, false);
	EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
	ASSERT_GL_NO_ERROR();
	}

	// Test sampling from a rectangle texture using the texture overload in ESSL3
	TEST_P(TextureRectangleTestES3, SamplingFromRectangleESSL3)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	&GLColor::green);

	constexpr char kFS[] =
	"#version 300 es\n"
	"#extension GL_ARB_texture_rectangle : require\n"
	"precision mediump float;\n"
	"uniform sampler2DRect tex;\n"
	"out vec4 fragColor;\n"
	"void main()\n"
	"{\n"
	" fragColor = texture(tex, vec2(0, 0));\n"
	"}\n";

	ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
	glUseProgram(program);

	GLint location = glGetUniformLocation(program, "tex");
	ASSERT_NE(-1, location);
	glUniform1i(location, 0);

	glClearColor(0.0, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT);
	drawQuad(program, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, false);
	EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
	ASSERT_GL_NO_ERROR();
	}

	// Test attaching a rectangle texture and rendering to it.
	TEST_P(TextureRectangleTest, RenderToRectangle)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	&GLColor::black);

	GLFramebuffer fbo;
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
	0);
	EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
	ASSERT_GL_NO_ERROR();

	// Clearing a texture is just as good as checking we can render to it, right?
	glClearColor(0.0, 1.0, 0.0, 1.0);
	glClear(GL_COLOR_BUFFER_BIT);
	EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
	ASSERT_GL_NO_ERROR();
	}

	TEST_P(TextureRectangleTest, DefaultSamplerParameters)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

	GLint minFilter = 0;
	glGetTexParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_MIN_FILTER, &minFilter);
	EXPECT_EQ(GL_LINEAR, minFilter);

	GLint wrapS = 0;
	glGetTexParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_S, &wrapS);
	EXPECT_EQ(GL_CLAMP_TO_EDGE, wrapS);

	GLint wrapT = 0;
	glGetTexParameteriv(GL_TEXTURE_RECTANGLE_ANGLE, GL_TEXTURE_WRAP_T, &wrapT);
	EXPECT_EQ(GL_CLAMP_TO_EDGE, wrapT);
	}

	// Test glCopyTexImage with rectangle textures
	TEST_P(TextureRectangleTestES3, CopyTexImage)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);

	glBindFramebuffer(GL_FRAMEBUFFER, 0);
	glClearColor(0, 1, 0, 1);
	glClear(GL_COLOR_BUFFER_BIT);
	ASSERT_GL_NO_ERROR();

	// Error case: level != 0
	glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, GL_RGBA8, 0, 0, 1, 1, 0);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);

	// level = 0 works and defines the texture.
	glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA8, 0, 0, 1, 1, 0);
	ASSERT_GL_NO_ERROR();

	GLFramebuffer fbo;
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
	0);
	EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
	ASSERT_GL_NO_ERROR();
	}

	// Test glCopyTexSubImage with rectangle textures
	TEST_P(TextureRectangleTestES3, CopyTexSubImage)
	{
	ANGLE_SKIP_TEST_IF(!checkExtensionSupported());

	GLTexture tex;
	glBindTexture(GL_TEXTURE_RECTANGLE_ANGLE, tex);
	glTexImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
	&GLColor::black);

	glBindFramebuffer(GL_FRAMEBUFFER, 0);
	glClearColor(0, 1, 0, 1);
	glClear(GL_COLOR_BUFFER_BIT);
	ASSERT_GL_NO_ERROR();

	// Error case: level != 0
	glCopyTexSubImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 1, 0, 0, 0, 0, 1, 1);
	ASSERT_GL_ERROR(GL_INVALID_VALUE);

	// level = 0 works and defines the texture.
	glCopyTexSubImage2D(GL_TEXTURE_RECTANGLE_ANGLE, 0, 0, 0, 0, 0, 1, 1);
	ASSERT_GL_NO_ERROR();

	GLFramebuffer fbo;
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ANGLE, tex,
	0);
	EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
	ASSERT_GL_NO_ERROR();
	}

	ANGLE_INSTANTIATE_TEST_ES2(TextureRectangleTest);
	ANGLE_INSTANTIATE_TEST_ES3(TextureRectangleTestES3);
	ANGLE_INSTANTIATE_TEST_ES31(TextureRectangleTestES31);
	} // anonymous namespace