Added tests for maximum texture size.

tests/angle_tests/MaxTextureSizeTest.cpp

+#include "ANGLETest.h"
+
+class MaxTextureSizeTest : public ANGLETest
+{
+protected:
+    MaxTextureSizeTest()
+    {
+        setWindowWidth(512);
+        setWindowHeight(512);
+        setConfigRedBits(8);
+        setConfigGreenBits(8);
+        setConfigBlueBits(8);
+        setConfigAlphaBits(8);
+    }
+
+    virtual void SetUp()
+    {
+        ANGLETest::SetUp();
+
+        const std::string vsSource = SHADER_SOURCE
+        (
+            precision highp float;
+            attribute vec4 position;
+            varying vec2 texcoord;
+
+            void main()
+            {
+                gl_Position = position;
+                texcoord = (position.xy * 0.5) + 0.5;
+            }
+        );
+
+        const std::string textureFSSource = SHADER_SOURCE
+        (
+            precision highp float;
+            uniform sampler2D tex;
+            varying vec2 texcoord;
+
+            void main()
+            {
+                gl_FragColor = texture2D(tex, texcoord);
+            }
+        );
+
+        const std::string blueFSSource = SHADER_SOURCE
+        (
+            precision highp float;
+
+            void main()
+            {
+                gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0);
+            }
+        );
+
+        mTextureProgram = compileProgram(vsSource, textureFSSource);
+        mBlueProgram = compileProgram(vsSource, blueFSSource);
+        if (mTextureProgram == 0 || mBlueProgram == 0)
+        {
+            FAIL() << "shader compilation failed.";
+        }
+
+        mTextureUniformLocation = glGetUniformLocation(mTextureProgram, "tex");
+
+        glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTexture2DSize);
+        glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, &mMaxTextureCubeSize);
+        glGetIntegerv(GL_MAX_RENDERBUFFER_SIZE, &mMaxRenderbufferSize);
+
+        ASSERT_GL_NO_ERROR();
+    }
+
+    virtual void TearDown()
+    {
+        glDeleteProgram(mTextureProgram);
+        glDeleteProgram(mBlueProgram);
+
+        ANGLETest::TearDown();
+    }
+
+    GLuint mTextureProgram;
+    GLint mTextureUniformLocation;
+
+    GLuint mBlueProgram;
+
+    GLint mMaxTexture2DSize;
+    GLint mMaxTextureCubeSize;
+    GLint mMaxRenderbufferSize;
+};
+
+TEST_F(MaxTextureSizeTest, specification_tex_image)
+{
+    GLuint tex;
+    glGenTextures(1, &tex);
+    glBindTexture(GL_TEXTURE_2D, tex);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    GLsizei textureWidth = mMaxTexture2DSize;
+    GLsizei textureHeight = 64;
+
+    std::vector<GLubyte> data(textureWidth * textureHeight * 4);
+    for (int y = 0; y < textureHeight; y++)
+    {
+        for (int x = 0; x < textureWidth; x++)
+        {
+            GLubyte* pixel = data.data() + ((y * textureWidth + x) * 4);
+
+            // Draw a gradient, red in direction, green in y direction
+            pixel[0] = static_cast<GLubyte>((float(x) / textureWidth) * 255);
+            pixel[1] = static_cast<GLubyte>((float(y) / textureHeight) * 255);
+            pixel[2] = 0;
+            pixel[3] = 255;
+        }
+    }
+
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureWidth, textureHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, data.data());
+    EXPECT_GL_NO_ERROR();
+
+    glUseProgram(mTextureProgram);
+    glUniform1i(mTextureUniformLocation, 0);
+
+    drawQuad(mTextureProgram, "position", 0.5f);
+
+    std::vector<GLubyte> pixels(getWindowWidth() * getWindowHeight() * 4);
+    glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, pixels.data());
+
+    for (int y = 1; y < getWindowHeight(); y++)
+    {
+        for (int x = 1; x < getWindowWidth(); x++)
+        {
+            const GLubyte* prevPixel = pixels.data() + (((y - 1) * getWindowWidth() + (x - 1)) * 4);
+            const GLubyte* curPixel = pixels.data() + ((y * getWindowWidth() + x) * 4);
+
+            EXPECT_GE(curPixel[0], prevPixel[0]);
+            EXPECT_GE(curPixel[1], prevPixel[1]);
+            EXPECT_EQ(curPixel[2], prevPixel[2]);
+            EXPECT_EQ(curPixel[3], prevPixel[3]);
+        }
+    }
+}
+
+TEST_F(MaxTextureSizeTest, specification_tex_storage)
+{
+    if (getClientVersion() < 3 && (!extensionEnabled("GL_EXT_texture_storage") || !extensionEnabled("GL_OES_rgb8_rgba8")))
+    {
+        return;
+    }
+
+    GLuint tex;
+    glGenTextures(1, &tex);
+    glBindTexture(GL_TEXTURE_2D, tex);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    GLsizei textureWidth = 64;
+    GLsizei textureHeight = mMaxTexture2DSize;
+
+    std::vector<GLubyte> data(textureWidth * textureHeight * 4);
+    for (int y = 0; y < textureHeight; y++)
+    {
+        for (int x = 0; x < textureWidth; x++)
+        {
+            GLubyte* pixel = data.data() + ((y * textureWidth + x) * 4);
+
+            // Draw a gradient, red in direction, green in y direction
+            pixel[0] = static_cast<GLubyte>((float(x) / textureWidth) * 255);
+            pixel[1] = static_cast<GLubyte>((float(y) / textureHeight) * 255);
+            pixel[2] = 0;
+            pixel[3] = 255;
+        }
+    }
+
+    if (getClientVersion() < 3)
+    {
+        glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8_OES, textureWidth, textureHeight);
+    }
+    else
+    {
+        glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8_OES, textureWidth, textureHeight);
+    }
+    EXPECT_GL_NO_ERROR();
+
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, textureWidth, textureHeight, GL_RGBA, GL_UNSIGNED_BYTE, data.data());
+    EXPECT_GL_NO_ERROR();
+
+    glUseProgram(mTextureProgram);
+    glUniform1i(mTextureUniformLocation, 0);
+
+    drawQuad(mTextureProgram, "position", 0.5f);
+
+    std::vector<GLubyte> pixels(getWindowWidth() * getWindowHeight() * 4);
+    glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, pixels.data());
+
+    for (int y = 1; y < getWindowHeight(); y++)
+    {
+        for (int x = 1; x < getWindowWidth(); x++)
+        {
+            const GLubyte* prevPixel = pixels.data() + (((y - 1) * getWindowWidth() + (x - 1)) * 4);
+            const GLubyte* curPixel = pixels.data() + ((y * getWindowWidth() + x) * 4);
+
+            EXPECT_GE(curPixel[0], prevPixel[0]);
+            EXPECT_GE(curPixel[1], prevPixel[1]);
+            EXPECT_EQ(curPixel[2], prevPixel[2]);
+            EXPECT_EQ(curPixel[3], prevPixel[3]);
+        }
+    }
+}
+
+TEST_F(MaxTextureSizeTest, render_to_texture)
+{
+    GLuint fbo = 0;
+    GLuint textureId = 0;
+    // create a 1-level texture at maximum size
+    glGenTextures(1, &textureId);
+    glBindTexture(GL_TEXTURE_2D, textureId);
+
+    GLsizei textureWidth = 64;
+    GLsizei textureHeight = mMaxTexture2DSize;
+
+    // texture setup code
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA_EXT, textureHeight, textureWidth, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, NULL);
+    EXPECT_GL_NO_ERROR();
+
+    // create an FBO and attach the texture
+    glGenFramebuffers(1, &fbo);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textureId, 0);
+
+    EXPECT_GL_NO_ERROR();
+    EXPECT_EQ(glCheckFramebufferStatus(GL_FRAMEBUFFER), GL_FRAMEBUFFER_COMPLETE);
+
+    const int frameCount = 64;
+    for (int i = 0; i < frameCount; i++)
+    {
+        // clear the screen
+        glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+        GLubyte clearRed = static_cast<GLubyte>((float(i) / frameCount) * 255);
+        GLubyte clearGreen = 255 - clearRed;
+        GLubyte clearBlue = 0;
+
+        glClearColor(clearRed / 255.0f, clearGreen / 255.0f, clearBlue / 255.0f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        // render blue into the texture
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+        drawQuad(mBlueProgram, "position", 0.5f);
+
+        // copy corner of texture to LL corner of window
+        glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, 0);
+        glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, fbo);
+        glBlitFramebufferANGLE(0, 0, textureWidth - 1, getWindowHeight() - 1,
+                               0, 0, textureWidth - 1, getWindowHeight() - 1,
+                               GL_COLOR_BUFFER_BIT, GL_NEAREST);
+        glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, 0);
+        EXPECT_GL_NO_ERROR();
+
+        EXPECT_PIXEL_EQ(textureWidth / 2, getWindowHeight() / 2, 0, 0, 255, 255);
+        EXPECT_PIXEL_EQ(textureWidth + 10, getWindowHeight() / 2, clearRed, clearGreen, clearBlue, 255);
+
+        swapBuffers();
+    }
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    glDeleteFramebuffers(1, &fbo);
+    glDeleteTextures(1, &textureId);
+}