1 files changed, 255 insertions, 0 deletions
diff --git a/gfx/angle/src/tests/gl_tests/BlendMinMaxTest.cpp b/gfx/angle/src/tests/gl_tests/BlendMinMaxTest.cpp
new file mode 100755
index 000000000..39f5251e5
--- /dev/null
+++ b/gfx/angle/src/tests/gl_tests/BlendMinMaxTest.cpp
@@ -0,0 +1,255 @@
+//
+// 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"
+
+using namespace angle;
+
+class BlendMinMaxTest : public ANGLETest
+{
+  protected:
+    BlendMinMaxTest()
+    {
+        setWindowWidth(128);
+        setWindowHeight(128);
+        setConfigRedBits(8);
+        setConfigGreenBits(8);
+        setConfigBlueBits(8);
+        setConfigAlphaBits(8);
+        setConfigDepthBits(24);
+
+        mProgram = 0;
+        mColorLocation = -1;
+        mFramebuffer = 0;
+        mColorRenderbuffer = 0;
+    }
+
+    struct Color
+    {
+        float values[4];
+    };
+
+    static float getExpected(bool blendMin, float curColor, float prevColor)
+    {
+        return blendMin ? std::min(curColor, prevColor) : std::max(curColor, prevColor);
+    }
+
+    void runTest(GLenum colorFormat, GLenum type)
+    {
+        if (getClientMajorVersion() < 3 && !extensionEnabled("GL_EXT_blend_minmax"))
+        {
+            std::cout << "Test skipped because ES3 or GL_EXT_blend_minmax is not available." << std::endl;
+            return;
+        }
+
+        // TODO(geofflang): figure out why this fails
+        if (IsIntel() && GetParam() == ES2_OPENGL())
+        {
+            std::cout << "Test skipped on OpenGL Intel due to flakyness." << std::endl;
+            return;
+        }
+
+        SetUpFramebuffer(colorFormat);
+
+        int minValue = 0;
+        int maxValue = 1;
+        if (type == GL_FLOAT)
+        {
+            minValue = -1024;
+            maxValue = 1024;
+        }
+
+        const size_t colorCount = 128;
+        Color colors[colorCount];
+        for (size_t i = 0; i < colorCount; i++)
+        {
+            for (size_t j = 0; j < 4; j++)
+            {
+                colors[i].values[j] =
+                    static_cast<float>(minValue + (rand() % (maxValue - minValue)));
+            }
+        }
+
+        float prevColor[4];
+        for (size_t i = 0; i < colorCount; i++)
+        {
+            const Color &color = colors[i];
+            glUseProgram(mProgram);
+            glUniform4f(mColorLocation, color.values[0], color.values[1], color.values[2], color.values[3]);
+
+            bool blendMin = (rand() % 2 == 0);
+            glBlendEquation(blendMin ? GL_MIN : GL_MAX);
+
+            drawQuad(mProgram, "aPosition", 0.5f);
+
+            float pixel[4];
+            if (type == GL_UNSIGNED_BYTE)
+            {
+                GLubyte ubytePixel[4];
+                glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, ubytePixel);
+                for (size_t componentIdx = 0; componentIdx < ArraySize(pixel); componentIdx++)
+                {
+                    pixel[componentIdx] = ubytePixel[componentIdx] / 255.0f;
+                }
+            }
+            else if (type == GL_FLOAT)
+            {
+                glReadPixels(0, 0, 1, 1, GL_RGBA, GL_FLOAT, pixel);
+            }
+            else
+            {
+                FAIL() << "Unexpected pixel type";
+            }
+
+            if (i > 0)
+            {
+                const float errorRange = 1.0f / 255.0f;
+                for (size_t componentIdx = 0; componentIdx < ArraySize(pixel); componentIdx++)
+                {
+                    EXPECT_NEAR(
+                        getExpected(blendMin, color.values[componentIdx], prevColor[componentIdx]),
+                        pixel[componentIdx], errorRange);
+                }
+            }
+
+            memcpy(prevColor, pixel, sizeof(pixel));
+        }
+    }
+
+    virtual void SetUp()
+    {
+        ANGLETest::SetUp();
+
+        const std::string testVertexShaderSource = SHADER_SOURCE
+        (
+            attribute highp vec4 aPosition;
+
+            void main(void)
+            {
+                gl_Position = aPosition;
+            }
+        );
+
+        const std::string testFragmentShaderSource = SHADER_SOURCE
+        (
+            uniform highp vec4 color;
+            void main(void)
+            {
+                gl_FragColor = color;
+            }
+        );
+
+        mProgram = CompileProgram(testVertexShaderSource, testFragmentShaderSource);
+        if (mProgram == 0)
+        {
+            FAIL() << "shader compilation failed.";
+        }
+
+        mColorLocation = glGetUniformLocation(mProgram, "color");
+
+        glUseProgram(mProgram);
+
+        glClearColor(0, 0, 0, 0);
+        glClearDepthf(0.0);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        glEnable(GL_BLEND);
+        glDisable(GL_DEPTH_TEST);
+    }
+
+    void SetUpFramebuffer(GLenum colorFormat)
+    {
+        glGenFramebuffers(1, &mFramebuffer);
+        glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mFramebuffer);
+        glBindFramebuffer(GL_READ_FRAMEBUFFER, mFramebuffer);
+
+        glGenRenderbuffers(1, &mColorRenderbuffer);
+        glBindRenderbuffer(GL_RENDERBUFFER, mColorRenderbuffer);
+        glRenderbufferStorage(GL_RENDERBUFFER, colorFormat, getWindowWidth(), getWindowHeight());
+        glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, mColorRenderbuffer);
+
+        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        ASSERT_GL_NO_ERROR();
+    }
+
+    virtual void TearDown()
+    {
+        glDeleteProgram(mProgram);
+        glDeleteFramebuffers(1, &mFramebuffer);
+        glDeleteRenderbuffers(1, &mColorRenderbuffer);
+
+        ANGLETest::TearDown();
+    }
+
+    GLuint mProgram;
+    GLint mColorLocation;
+
+    GLuint mFramebuffer;
+    GLuint mColorRenderbuffer;
+};
+
+TEST_P(BlendMinMaxTest, RGBA8)
+{
+    runTest(GL_RGBA8, GL_UNSIGNED_BYTE);
+}
+
+TEST_P(BlendMinMaxTest, RGBA32F)
+{
+    if (getClientMajorVersion() < 3 || !extensionEnabled("GL_EXT_color_buffer_float"))
+    {
+        std::cout << "Test skipped because ES3 and GL_EXT_color_buffer_float are not available."
+                  << std::endl;
+        return;
+    }
+
+    // TODO(jmadill): Figure out why this is broken on Intel
+    if (IsIntel() && (GetParam() == ES2_D3D11() || GetParam() == ES2_D3D9()))
+    {
+        std::cout << "Test skipped on Intel OpenGL." << std::endl;
+        return;
+    }
+
+    // TODO (bug 1284): Investigate RGBA32f D3D SDK Layers messages on D3D11_FL9_3
+    if (IsD3D11_FL93())
+    {
+        std::cout << "Test skipped on Feature Level 9_3." << std::endl;
+        return;
+    }
+
+    runTest(GL_RGBA32F, GL_FLOAT);
+}
+
+TEST_P(BlendMinMaxTest, RGBA16F)
+{
+    if (getClientMajorVersion() < 3 && !extensionEnabled("GL_EXT_color_buffer_half_float"))
+    {
+        std::cout << "Test skipped because ES3 or GL_EXT_color_buffer_half_float is not available."
+                  << std::endl;
+        return;
+    }
+
+    // TODO(jmadill): figure out why this fails
+    if (IsIntel() && (GetParam() == ES2_D3D11() || GetParam() == ES2_D3D9()))
+    {
+        std::cout << "Test skipped on Intel due to failures." << std::endl;
+        return;
+    }
+
+    runTest(GL_RGBA16F, GL_FLOAT);
+}
+
+// Use this to select which configurations (e.g. which renderer, which GLES major version) these tests should be run against.
+ANGLE_INSTANTIATE_TEST(BlendMinMaxTest,
+                       ES2_D3D9(),
+                       ES2_D3D11(),
+                       ES3_D3D11(),
+                       ES2_D3D11_FL9_3(),
+                       ES2_OPENGL(),
+                       ES3_OPENGL(),
+                       ES2_OPENGLES(),
+                       ES3_OPENGLES());