| // |
| // 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. |
| // |
| // SixteenBppTextureTest: |
| // Basic tests using 16bpp texture formats (e.g. GL_RGB565). |
| |
| #include "test_utils/ANGLETest.h" |
| #include "test_utils/gl_raii.h" |
| |
| #include "image_util/imageformats.h" |
| |
| using namespace angle; |
| |
| namespace |
| { |
| |
| GLColor Convert565(const R5G6B5 &rgb565) |
| { |
| gl::ColorF colorf; |
| R5G6B5::readColor(&colorf, &rgb565); |
| Vector4 vecColor(colorf.red, colorf.green, colorf.blue, colorf.alpha); |
| return GLColor(vecColor); |
| } |
| |
| R5G6B5 Convert565(const GLColor &glColor) |
| { |
| const Vector4 &vecColor = glColor.toNormalizedVector(); |
| gl::ColorF colorf(vecColor.x(), vecColor.y(), vecColor.z(), vecColor.w()); |
| R5G6B5 rgb565; |
| R5G6B5::writeColor(&rgb565, &colorf); |
| return rgb565; |
| } |
| |
| class SixteenBppTextureTest : public ANGLETest<> |
| { |
| protected: |
| SixteenBppTextureTest() |
| { |
| setWindowWidth(128); |
| setWindowHeight(128); |
| setConfigRedBits(8); |
| setConfigGreenBits(8); |
| setConfigBlueBits(8); |
| setConfigAlphaBits(8); |
| } |
| |
| void testSetUp() override |
| { |
| constexpr char kVS[] = R"(precision highp float; |
| attribute vec4 position; |
| varying vec2 texcoord; |
| |
| void main() |
| { |
| gl_Position = vec4(position.xy, 0.0, 1.0); |
| texcoord = (position.xy * 0.5) + 0.5; |
| })"; |
| |
| constexpr char kFS[] = R"(precision highp float; |
| uniform sampler2D tex; |
| varying vec2 texcoord; |
| |
| void main() |
| { |
| gl_FragColor = texture2D(tex, texcoord); |
| })"; |
| |
| m2DProgram = CompileProgram(kVS, kFS); |
| mTexture2DUniformLocation = glGetUniformLocation(m2DProgram, "tex"); |
| } |
| |
| void testTearDown() override { glDeleteProgram(m2DProgram); } |
| |
| void simpleValidationBase(GLuint tex) |
| { |
| // Draw a quad using the texture |
| glClear(GL_COLOR_BUFFER_BIT); |
| glUseProgram(m2DProgram); |
| glUniform1i(mTexture2DUniformLocation, 0); |
| drawQuad(m2DProgram, "position", 0.5f); |
| ASSERT_GL_NO_ERROR(); |
| |
| int w = getWindowWidth() - 1; |
| int h = getWindowHeight() - 1; |
| |
| // Check that it drew as expected |
| EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red); |
| EXPECT_PIXEL_COLOR_EQ(w, 0, GLColor::green); |
| EXPECT_PIXEL_COLOR_EQ(0, h, GLColor::blue); |
| EXPECT_PIXEL_COLOR_EQ(w, h, GLColor::yellow); |
| |
| // Generate mipmaps |
| glGenerateMipmap(GL_TEXTURE_2D); |
| |
| // Draw a quad using the texture |
| glClear(GL_COLOR_BUFFER_BIT); |
| glUseProgram(m2DProgram); |
| glUniform1i(mTexture2DUniformLocation, 0); |
| drawQuad(m2DProgram, "position", 0.5f); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Check that it drew as expected |
| EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red); |
| EXPECT_PIXEL_COLOR_EQ(w, 0, GLColor::green); |
| EXPECT_PIXEL_COLOR_EQ(0, h, GLColor::blue); |
| EXPECT_PIXEL_COLOR_EQ(w, h, GLColor::yellow); |
| |
| // Bind the texture as a framebuffer, render to it, then check the results |
| GLFramebuffer fbo; |
| glBindFramebuffer(GL_FRAMEBUFFER, fbo); |
| glBindTexture(GL_TEXTURE_2D, 0); |
| glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0); |
| |
| if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_UNSUPPORTED) |
| { |
| glClearColor(1.0f, 0.0f, 0.0f, 1.0f); |
| glClear(GL_COLOR_BUFFER_BIT); |
| EXPECT_PIXEL_EQ(0, 0, 255, 0, 0, 255); |
| EXPECT_PIXEL_EQ(1, 0, 255, 0, 0, 255); |
| EXPECT_PIXEL_EQ(1, 1, 255, 0, 0, 255); |
| EXPECT_PIXEL_EQ(0, 1, 255, 0, 0, 255); |
| } |
| else |
| { |
| std::cout << "Skipping rendering to an unsupported framebuffer format" << std::endl; |
| } |
| } |
| |
| GLuint m2DProgram; |
| GLint mTexture2DUniformLocation; |
| }; |
| |
| class SixteenBppTextureTestES3 : public SixteenBppTextureTest |
| {}; |
| |
| // Simple validation test for GL_RGB565 textures. |
| // Samples from the texture, renders to it, generates mipmaps etc. |
| TEST_P(SixteenBppTextureTest, RGB565Validation) |
| { |
| GLuint test; |
| memcpy(&test, &GLColor::black, 4); |
| |
| R5G6B5 pixels[4] = {Convert565(GLColor::red), Convert565(GLColor::green), |
| Convert565(GLColor::blue), Convert565(GLColor::yellow)}; |
| |
| glClearColor(0, 0, 0, 0); |
| |
| // Create a simple RGB565 texture |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, nullptr); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| EXPECT_GL_NO_ERROR(); |
| |
| // Supply the data to it |
| glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 2, 2, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, pixels); |
| EXPECT_GL_NO_ERROR(); |
| |
| simpleValidationBase(tex); |
| } |
| |
| // Simple validation test for GL_RGB5_A1 textures. |
| // Samples from the texture, renders to it, generates mipmaps etc. |
| TEST_P(SixteenBppTextureTest, RGBA5551Validation) |
| { |
| GLushort pixels[4] = { |
| 0xF801, // Red |
| 0x07C1, // Green |
| 0x003F, // Blue |
| 0xFFC1 // Red + Green |
| }; |
| |
| // Create a simple 5551 texture |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, nullptr); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| EXPECT_GL_NO_ERROR(); |
| |
| glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 2, 2, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, pixels); |
| EXPECT_GL_NO_ERROR(); |
| |
| simpleValidationBase(tex); |
| } |
| |
| // Test to ensure calling Clear() on an RGBA5551 texture does something reasonable |
| // Based on WebGL test conformance/textures/texture-attachment-formats.html |
| TEST_P(SixteenBppTextureTest, RGBA5551ClearAlpha) |
| { |
| GLTexture tex; |
| GLFramebuffer fbo; |
| |
| // Create a simple 5551 texture |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, nullptr); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| EXPECT_GL_NO_ERROR(); |
| |
| // Bind the texture as a framebuffer, clear it, then check the results |
| glBindFramebuffer(GL_FRAMEBUFFER, fbo); |
| glBindTexture(GL_TEXTURE_2D, 0); |
| glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0); |
| |
| if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_UNSUPPORTED) |
| { |
| glClearColor(0.0f, 0.0f, 0.0f, 0.0f); |
| glClear(GL_COLOR_BUFFER_BIT); |
| EXPECT_PIXEL_EQ(0, 0, 0, 0, 0, 0); |
| |
| glClearColor(0.0f, 0.0f, 0.0f, 1.0f); |
| glClear(GL_COLOR_BUFFER_BIT); |
| EXPECT_PIXEL_EQ(0, 0, 0, 0, 0, 255); |
| } |
| else |
| { |
| std::cout << "Skipping rendering to an unsupported framebuffer format" << std::endl; |
| } |
| } |
| |
| // Simple validation test for GL_RGBA4 textures. |
| // Samples from the texture, renders to it, generates mipmaps etc. |
| TEST_P(SixteenBppTextureTest, RGBA4444Validation) |
| { |
| GLushort pixels[4] = { |
| 0xF00F, // Red |
| 0x0F0F, // Green |
| 0x00FF, // Blue |
| 0xFF0F // Red + Green |
| }; |
| |
| glClearColor(0, 0, 0, 0); |
| |
| // Generate a RGBA4444 texture, no mipmaps |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, nullptr); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| EXPECT_GL_NO_ERROR(); |
| |
| // Provide some data for the texture |
| glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 2, 2, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, pixels); |
| EXPECT_GL_NO_ERROR(); |
| |
| simpleValidationBase(tex); |
| } |
| |
| // Test uploading RGBA8 data to RGBA4 textures. |
| TEST_P(SixteenBppTextureTestES3, RGBA4UploadRGBA8) |
| { |
| const std::array<GLColor, 4> kFourColors = { |
| {GLColor::red, GLColor::green, GLColor::blue, GLColor::yellow}}; |
| |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA4, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, |
| kFourColors.data()); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| ASSERT_GL_NO_ERROR(); |
| simpleValidationBase(tex); |
| } |
| |
| // Test uploading RGB8 data to RGB565 textures. |
| TEST_P(SixteenBppTextureTestES3, RGB565UploadRGB8) |
| { |
| std::vector<GLColorRGB> fourColors; |
| fourColors.push_back(GLColorRGB::red); |
| fourColors.push_back(GLColorRGB::green); |
| fourColors.push_back(GLColorRGB::blue); |
| fourColors.push_back(GLColorRGB::yellow); |
| |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB565, 2, 2, 0, GL_RGB, GL_UNSIGNED_BYTE, fourColors.data()); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| ASSERT_GL_NO_ERROR(); |
| |
| simpleValidationBase(tex); |
| } |
| |
| // Test uploading RGBA8 data to RGB5A41 textures. |
| TEST_P(SixteenBppTextureTestES3, RGB5A1UploadRGBA8) |
| { |
| std::vector<GLColor> fourColors; |
| fourColors.push_back(GLColor::red); |
| fourColors.push_back(GLColor::green); |
| fourColors.push_back(GLColor::blue); |
| fourColors.push_back(GLColor::yellow); |
| |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5_A1, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, |
| fourColors.data()); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| ASSERT_GL_NO_ERROR(); |
| simpleValidationBase(tex); |
| } |
| |
| // Test uploading RGB10A2 data to RGB5A1 textures. |
| TEST_P(SixteenBppTextureTestES3, RGB5A1UploadRGB10A2) |
| { |
| struct RGB10A2 |
| { |
| RGB10A2(uint32_t r, uint32_t g, uint32_t b, uint32_t a) : R(r), G(g), B(b), A(a) {} |
| |
| uint32_t R : 10; |
| uint32_t G : 10; |
| uint32_t B : 10; |
| uint32_t A : 2; |
| }; |
| |
| uint32_t one10 = (1u << 10u) - 1u; |
| |
| RGB10A2 red(one10, 0u, 0u, 0x3u); |
| RGB10A2 green(0u, one10, 0u, 0x3u); |
| RGB10A2 blue(0u, 0u, one10, 0x3u); |
| RGB10A2 yellow(one10, one10, 0u, 0x3u); |
| |
| std::vector<RGB10A2> fourColors; |
| fourColors.push_back(red); |
| fourColors.push_back(green); |
| fourColors.push_back(blue); |
| fourColors.push_back(yellow); |
| |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5_A1, 2, 2, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, |
| fourColors.data()); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| ASSERT_GL_NO_ERROR(); |
| simpleValidationBase(tex); |
| } |
| |
| // Test reading from RGBA4 textures attached to FBO. |
| TEST_P(SixteenBppTextureTestES3, RGBA4FramebufferReadback) |
| { |
| // TODO(jmadill): Fix bug with GLES |
| ANGLE_SKIP_TEST_IF(IsOpenGLES()); |
| |
| Vector4 rawColor(0.5f, 0.7f, 1.0f, 0.0f); |
| GLColor expectedColor(rawColor); |
| |
| GLFramebuffer fbo; |
| glBindFramebuffer(GL_FRAMEBUFFER, fbo); |
| |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA4, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr); |
| glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0); |
| |
| glClearColor(rawColor.x(), rawColor.y(), rawColor.z(), rawColor.w()); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| ASSERT_GL_NO_ERROR(); |
| |
| GLenum colorReadFormat = GL_NONE; |
| GLenum colorReadType = GL_NONE; |
| glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, reinterpret_cast<GLint *>(&colorReadFormat)); |
| glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, reinterpret_cast<GLint *>(&colorReadType)); |
| |
| if (colorReadFormat == GL_RGBA && colorReadType == GL_UNSIGNED_BYTE) |
| { |
| GLColor actualColor = GLColor::black; |
| glReadPixels(0, 0, 1, 1, colorReadFormat, colorReadType, &actualColor); |
| EXPECT_COLOR_NEAR(expectedColor, actualColor, 20); |
| } |
| else |
| { |
| ASSERT_GLENUM_EQ(GL_RGBA, colorReadFormat); |
| ASSERT_TRUE(colorReadType == GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT || |
| colorReadType == GL_UNSIGNED_SHORT_4_4_4_4); |
| |
| uint16_t rgba = 0; |
| glReadPixels(0, 0, 1, 1, colorReadFormat, colorReadType, &rgba); |
| |
| GLubyte r8 = static_cast<GLubyte>((rgba & 0xF000) >> 12); |
| GLubyte g8 = static_cast<GLubyte>((rgba & 0x0F00) >> 8); |
| GLubyte b8 = static_cast<GLubyte>((rgba & 0x00F0) >> 4); |
| GLubyte a8 = static_cast<GLubyte>((rgba & 0x000F)); |
| |
| GLColor actualColor(r8 << 4, g8 << 4, b8 << 4, a8 << 4); |
| EXPECT_COLOR_NEAR(expectedColor, actualColor, 20); |
| } |
| |
| ASSERT_GL_NO_ERROR(); |
| } |
| |
| // Test reading from RGB565 textures attached to FBO. |
| TEST_P(SixteenBppTextureTestES3, RGB565FramebufferReadback) |
| { |
| // TODO(jmadill): Fix bug with GLES |
| ANGLE_SKIP_TEST_IF(IsOpenGLES()); |
| |
| GLFramebuffer fbo; |
| glBindFramebuffer(GL_FRAMEBUFFER, fbo); |
| |
| std::vector<GLColor> fourColors; |
| fourColors.push_back(GLColor::red); |
| fourColors.push_back(GLColor::green); |
| fourColors.push_back(GLColor::blue); |
| fourColors.push_back(GLColor::white); |
| |
| constexpr char kVS[] = |
| "#version 300 es\n" |
| "in vec4 color;\n" |
| "in vec2 position;\n" |
| "out vec4 fcolor;\n" |
| "void main() {\n" |
| " fcolor = color;\n" |
| " gl_Position = vec4(position, 0.5, 1.0);\n" |
| "}"; |
| constexpr char kFS[] = |
| "#version 300 es\n" |
| "in mediump vec4 fcolor;\n" |
| "out mediump vec4 color;\n" |
| "void main() {\n" |
| " color = fcolor;\n" |
| "}"; |
| |
| GLuint program = CompileProgram(kVS, kFS); |
| glUseProgram(program); |
| |
| GLint colorLocation = glGetAttribLocation(program, "color"); |
| ASSERT_NE(-1, colorLocation); |
| glEnableVertexAttribArray(colorLocation); |
| glVertexAttribPointer(colorLocation, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, fourColors.data()); |
| |
| int w = getWindowWidth(); |
| int h = getWindowHeight(); |
| |
| glViewport(0, 0, w, h); |
| |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB565, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr); |
| glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0); |
| |
| drawIndexedQuad(program, "position", 0.5f); |
| |
| ASSERT_GL_NO_ERROR(); |
| |
| int t = 12; |
| EXPECT_PIXEL_COLOR_NEAR(0, h - 1, GLColor::red, t); |
| EXPECT_PIXEL_COLOR_NEAR(0, 0, GLColor::green, t); |
| EXPECT_PIXEL_COLOR_NEAR(w - 1, 0, GLColor::blue, t); |
| EXPECT_PIXEL_COLOR_NEAR(w - 1, h - 1, GLColor::white, t); |
| |
| GLenum colorReadFormat = GL_NONE; |
| GLenum colorReadType = GL_NONE; |
| glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, reinterpret_cast<GLint *>(&colorReadFormat)); |
| glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, reinterpret_cast<GLint *>(&colorReadType)); |
| |
| if (colorReadFormat == GL_RGB && colorReadType == GL_UNSIGNED_SHORT_5_6_5) |
| { |
| std::vector<R5G6B5> readColors(w * h); |
| glReadPixels(0, 0, w, h, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, readColors.data()); |
| |
| int hoffset = (h - 1) * w; |
| EXPECT_COLOR_NEAR(GLColor::red, Convert565(readColors[hoffset]), t); |
| EXPECT_COLOR_NEAR(GLColor::green, Convert565(readColors[0]), t); |
| EXPECT_COLOR_NEAR(GLColor::blue, Convert565(readColors[w - 1]), t); |
| EXPECT_COLOR_NEAR(GLColor::white, Convert565(readColors[w - 1 + hoffset]), t); |
| } |
| |
| glDeleteProgram(program); |
| } |
| |
| class SixteenBppTextureDitheringTestES3 : public SixteenBppTextureTestES3 |
| { |
| protected: |
| SixteenBppTextureDitheringTestES3() |
| { |
| setWindowWidth(512); |
| setWindowHeight(512); |
| setConfigRedBits(8); |
| setConfigGreenBits(8); |
| setConfigBlueBits(8); |
| setConfigAlphaBits(8); |
| } |
| |
| enum class Gradient |
| { |
| RedGreen, |
| RedBlue, |
| GreenBlue, |
| }; |
| |
| std::string makeVS(Gradient gradient) |
| { |
| std::ostringstream vs; |
| vs << R"(#version 300 es |
| out mediump vec4 color; |
| void main() |
| { |
| // gl_VertexID x y |
| // 0 -1 -1 Black |
| // 1 1 -1 Red |
| // 2 -1 1 Green |
| // 3 1 1 Yellow |
| int bit0 = gl_VertexID & 1; |
| int bit1 = gl_VertexID >> 1; |
| gl_Position = vec4(bit0 * 2 - 1, bit1 * 2 - 1, 0, 1); |
| color = )"; |
| switch (gradient) |
| { |
| case Gradient::RedGreen: |
| vs << "vec4(bit0, bit1, 0, 1)"; |
| break; |
| case Gradient::RedBlue: |
| vs << "vec4(bit1, 0, bit0, 1)"; |
| break; |
| case Gradient::GreenBlue: |
| vs << "vec4(0, bit0, bit1, 1)"; |
| break; |
| } |
| vs << R"(; |
| })"; |
| |
| return vs.str(); |
| } |
| |
| const char *getFS() |
| { |
| return R"(#version 300 es |
| precision mediump float; |
| in vec4 color; |
| out vec4 colorOut; |
| void main() |
| { |
| colorOut = color; |
| })"; |
| } |
| |
| GLColor getRightColor(Gradient gradient) |
| { |
| switch (gradient) |
| { |
| case Gradient::RedGreen: |
| return GLColor::red; |
| case Gradient::RedBlue: |
| return GLColor::blue; |
| case Gradient::GreenBlue: |
| return GLColor::green; |
| default: |
| UNREACHABLE(); |
| return GLColor::red; |
| } |
| } |
| |
| GLColor getTopColor(Gradient gradient) |
| { |
| switch (gradient) |
| { |
| case Gradient::RedGreen: |
| return GLColor::green; |
| case Gradient::RedBlue: |
| return GLColor::red; |
| case Gradient::GreenBlue: |
| return GLColor::blue; |
| default: |
| UNREACHABLE(); |
| return GLColor::red; |
| } |
| } |
| |
| void bandingTest(GLuint fbo, GLenum format, Gradient gradient, bool ditheringExpected); |
| void bandingTestWithSwitch(GLenum format, Gradient gradient); |
| }; |
| |
| void SixteenBppTextureDitheringTestES3::bandingTest(GLuint fbo, |
| GLenum format, |
| Gradient gradient, |
| bool ditheringExpected) |
| { |
| int w = getWindowWidth(); |
| int h = getWindowHeight(); |
| |
| glBindFramebuffer(GL_FRAMEBUFFER, fbo); |
| |
| GLTexture tex; |
| glBindTexture(GL_TEXTURE_2D, tex); |
| glTexStorage2D(GL_TEXTURE_2D, 1, format, w, h); |
| glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0); |
| |
| ANGLE_GL_PROGRAM(program, makeVS(gradient).c_str(), getFS()); |
| glUseProgram(program); |
| |
| glViewport(0, 0, w, h); |
| |
| glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); |
| ASSERT_GL_NO_ERROR(); |
| |
| glBindFramebuffer(GL_FRAMEBUFFER, 0); |
| |
| // Draw a quad using the texture |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| |
| glUseProgram(m2DProgram); |
| glUniform1i(mTexture2DUniformLocation, 0); |
| drawQuad(m2DProgram, "position", 0.5f); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Verify results. Note that no dithering algorithm is specified by the spec, so the test |
| // cannot actually verify that the output is dithered in any way. These tests exist for visual |
| // verification and debugging only. |
| int maxError = 0; |
| switch (format) |
| { |
| case GL_RGBA4: |
| maxError = 256 / 16; |
| break; |
| case GL_RGB5_A1: |
| case GL_RGB565: |
| maxError = 256 / 32; |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| |
| const GLColor rightColor = getRightColor(gradient); |
| const GLColor topColor = getTopColor(gradient); |
| const GLColor topRightColor = GLColor(rightColor.R + topColor.R, rightColor.G + topColor.G, |
| rightColor.B + topColor.B, 255); |
| |
| EXPECT_PIXEL_COLOR_NEAR(0, 0, GLColor::black, maxError); |
| EXPECT_PIXEL_COLOR_NEAR(w - 1, 0, rightColor, maxError); |
| EXPECT_PIXEL_COLOR_NEAR(0, h - 1, topColor, maxError); |
| EXPECT_PIXEL_COLOR_NEAR(w - 1, h - 1, topRightColor, maxError); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Stricter pixel check on Android where dithering is supported by the driver or emulated. |
| if (getEGLWindow()->isFeatureEnabled(Feature::EmulateDithering) || |
| getEGLWindow()->isFeatureEnabled(Feature::SupportsLegacyDithering)) |
| { |
| uint32_t pixelCount = w * h; |
| std::vector<uint32_t> pixelData(pixelCount); |
| glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, pixelData.data()); |
| |
| int samePixelCount = 0; |
| for (EGLint y = 0; y < h; ++y) |
| { |
| for (EGLint x = 0; x < w; ++x) |
| { |
| EGLint srcPixel = x + y * w; |
| if (x < w - 1 && pixelData[srcPixel] == pixelData[srcPixel + 1]) |
| { |
| samePixelCount++; |
| } |
| } |
| } |
| |
| double samePixelCountRatio = (1.0 * samePixelCount) / (w * h); |
| // ~0.3 (dithering) vs 0.8+ (no dithering) |
| if (ditheringExpected) |
| { |
| EXPECT_LT(samePixelCountRatio, 0.7); |
| } |
| else |
| { |
| EXPECT_GT(samePixelCountRatio, 0.7); |
| } |
| } |
| } |
| |
| void SixteenBppTextureDitheringTestES3::bandingTestWithSwitch(GLenum format, Gradient gradient) |
| { |
| GLFramebuffer fbo; |
| GLFramebuffer anotherFbo; |
| |
| // GL_DITHER defaults to enabled |
| bandingTest(fbo, format, gradient, true); |
| |
| glDisable(GL_DITHER); |
| bandingTest(fbo, format, gradient, false); |
| |
| // Check that still disabled after switching to another framebuffer |
| bandingTest(anotherFbo, format, gradient, false); |
| |
| glEnable(GL_DITHER); |
| bandingTest(fbo, format, gradient, true); |
| |
| // Check that it is now enabled on another framebuffer |
| bandingTest(anotherFbo, format, gradient, true); |
| } |
| |
| // Test dithering applied to RGBA4. |
| TEST_P(SixteenBppTextureDitheringTestES3, RGBA4) |
| { |
| bandingTestWithSwitch(GL_RGBA4, Gradient::RedGreen); |
| } |
| |
| // Test dithering applied to RGBA5551. |
| TEST_P(SixteenBppTextureDitheringTestES3, RGBA5551) |
| { |
| bandingTestWithSwitch(GL_RGB5_A1, Gradient::RedBlue); |
| } |
| |
| // Test dithering applied to RGB565. |
| TEST_P(SixteenBppTextureDitheringTestES3, RGB565) |
| { |
| bandingTestWithSwitch(GL_RGB565, Gradient::GreenBlue); |
| } |
| |
| ANGLE_INSTANTIATE_TEST_ES2(SixteenBppTextureTest); |
| |
| GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(SixteenBppTextureTestES3); |
| ANGLE_INSTANTIATE_TEST_ES3(SixteenBppTextureTestES3); |
| |
| GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(SixteenBppTextureDitheringTestES3); |
| ANGLE_INSTANTIATE_TEST_ES3(SixteenBppTextureDitheringTestES3); |
| |
| } // namespace |
