Support EXT_blend_func_extended in the GLES2 context

src/libANGLE/Caps.cpp

@@ -164,7 +164,9 @@ Extensions::Extensions()
       multisampleCompatibility(false),
       framebufferMixedSamples(false),
       textureNorm16(false),
-      pathRendering(false)
+      pathRendering(false),
+      blendFuncExtended(false),
+      maxDualSourceDrawBuffers(0)
 {
 }
 
@@ -242,6 +244,7 @@ std::vector<std::string> Extensions::getStrings() const
     InsertExtensionString("GL_CHROMIUM_framebuffer_mixed_samples", framebufferMixedSamples,   &extensionStrings);
     InsertExtensionString("GL_EXT_texture_norm16",                 textureNorm16,             &extensionStrings);
     InsertExtensionString("GL_CHROMIUM_path_rendering",            pathRendering,             &extensionStrings);
+    InsertExtensionString("GL_EXT_blend_func_extended",            blendFuncExtended,         &extensionStrings);
     // clang-format on
 
     return extensionStrings;

src/libANGLE/Caps.h

@@ -306,6 +306,10 @@ struct Extensions
 
     // GL_CHROMIUM_path_rendering
     bool pathRendering;
+
+    // GL_EXT_blend_func_extended
+    bool blendFuncExtended;
+    GLuint maxDualSourceDrawBuffers;
 };
 
 struct Limitations

src/libANGLE/Compiler.cpp

@@ -52,6 +52,7 @@ Compiler::Compiler(rx::GLImplFactory *implFactory, const ContextState &state)
     mResources.EXT_shader_texture_lod          = extensions.shaderTextureLOD;
     mResources.OES_EGL_image_external          = extensions.eglImageExternal;
     mResources.OES_EGL_image_external_essl3    = extensions.eglImageExternalEssl3;
+    mResources.EXT_blend_func_extended         = extensions.blendFuncExtended;
     mResources.NV_EGL_stream_consumer_external = extensions.eglStreamConsumerExternal;
     // TODO: use shader precision caps to determine if high precision is supported?
     mResources.FragmentPrecisionHigh = 1;
@@ -62,6 +63,9 @@ Compiler::Compiler(rx::GLImplFactory *implFactory, const ContextState &state)
     mResources.MaxFragmentInputVectors = caps.maxFragmentInputComponents / 4;
     mResources.MinProgramTexelOffset   = caps.minProgramTexelOffset;
     mResources.MaxProgramTexelOffset   = caps.maxProgramTexelOffset;
+
+    // EXT_blend_func_extended
+    mResources.MaxDualSourceDrawBuffers = extensions.maxDualSourceDrawBuffers;
 }
 
 Compiler::~Compiler()

src/libANGLE/Context.cpp

@@ -1282,6 +1282,11 @@ void Context::getIntegerv(GLenum pname, GLint *params)
           *params = mImplementation->getGPUDisjoint();
           break;
 
+      // GL_EXT_blend_func_extended
+      case GL_MAX_DUAL_SOURCE_DRAW_BUFFERS_EXT:
+          *params = mExtensions.maxDualSourceDrawBuffers;
+          break;
+
       default:
           mGLState.getIntegerv(mState, pname, params);
           break;
@@ -2083,6 +2088,10 @@ void Context::initCaps()
     {
         // FIXME(geofflang): Don't support EXT_sRGB in non-ES2 contexts
         //mExtensions.sRGB = false;
+
+        // EXT_blend_func_extended is only implemented against GLES2 now
+        // TODO(svaisanen@nvidia.com): remove this limitation once GLES3 support is in place.
+        mExtensions.blendFuncExtended = false;
     }
 
     // Some extensions are always available because they are implemented in the GL layer.

src/libANGLE/ContextState.cpp

@@ -324,6 +324,17 @@ bool ValidationContext::getQueryParameterInfo(GLenum pname, GLenum *type, unsign
         }
     }
 
+    if (getExtensions().blendFuncExtended)
+    {
+        switch (pname)
+        {
+            case GL_MAX_DUAL_SOURCE_DRAW_BUFFERS_EXT:
+                *type      = GL_INT;
+                *numParams = 1;
+                return true;
+        }
+    }
+
     // Check for ES3.0+ parameter names which are also exposed as ES2 extensions
     switch (pname)
     {

src/libANGLE/renderer/gl/FunctionsGL.cpp

@@ -1023,6 +1023,9 @@ void FunctionsGL::initializeProcsDesktopGL()
     AssignGLExtensionEntryPoint(extensions, "GL_ARB_get_program_binary", loadProcAddress("glProgramBinary"), &programBinary);
     AssignGLExtensionEntryPoint(extensions, "GL_ARB_get_program_binary", loadProcAddress("glProgramParameteri"), &programParameteri);
 
+    // GL_ARB_blend_func_extended (loading only functions relevant to supporting EXT_blend_func_extended)
+    AssignGLExtensionEntryPoint(extensions, "GL_ARB_blend_func_extended", loadProcAddress("glBindFragDataLocationIndexed"), &bindFragDataLocationIndexed);
+
     // 1.0
     if (isAtLeastGL(gl::Version(1, 0)))
     {
@@ -1885,6 +1888,9 @@ void FunctionsGL::initializeProcsGLES()
     AssignGLExtensionEntryPoint(extensions, "GL_OES_get_program_binary", loadProcAddress("glGetProgramBinaryOES"), &getProgramBinary);
     AssignGLExtensionEntryPoint(extensions, "GL_OES_get_program_binary", loadProcAddress("glProgramBinaryOES"), &programBinary);
 
+    // EXT_blend_func_extended (loading only functions relevant to supporting EXT_blend_func_extenteded)
+    AssignGLExtensionEntryPoint(extensions, "GL_EXT_blend_func_extended", loadProcAddress("glBindFragLocationIndexedEXT"), &bindFragDataLocationIndexed);
+
     // 2.0
     if (isAtLeastGLES(gl::Version(2, 0)))
     {

src/libANGLE/renderer/gl/ProgramGL.cpp

@@ -142,6 +142,45 @@ LinkResult ProgramGL::link(const gl::ContextState &data, gl::InfoLog &infoLog)
         mFunctions->bindAttribLocation(mProgramID, attribute.location, attribute.name.c_str());
     }
 
+    // EXT_blend_func_extended.
+    // Bind the (transformed) secondary fragment color outputs.
+    //
+    // TODO(svaisanen@nvidia.com) We should probably check the actual context that we're
+    // using here. If our backing context happens to be only GLES2 then:
+    //  - the shader translator should not transform the gl_SecondaryFragColor/Data
+    //    and thus we shouldn't do the bind because it's not needed and the bind API
+    //    is not even available.
+    //
+    const auto &shaderOutputs = mState.getAttachedFragmentShader()->getActiveOutputVariables();
+    for (const auto &output : shaderOutputs)
+    {
+        if (output.name == "gl_SecondaryFragColorEXT")
+        {
+            mFunctions->bindFragDataLocationIndexed(mProgramID, 0, 0, "webgl_FragColor");
+            mFunctions->bindFragDataLocationIndexed(mProgramID, 0, 1, "angle_SecondaryFragColor");
+        }
+        else if (output.name == "gl_SecondaryFragDataEXT")
+        {
+            // Basically we should have a loop here going over the output
+            // array binding "webgl_FragData[i]" and "angle_SecondaryFragData[i]" array
+            // indices to the correct color buffers and color indices.
+            // However I'm not sure if this construct is legal or not, neither ARB or EXT
+            // version of the spec mention this.
+            //
+            // In practice it seems that binding array members works on some drivers and
+            // fails on others. One option could be to modify the shader translator to
+            // expand the arrays into individual output variables instead of using an array.
+            //
+            // For now we're going to have a limitation of assuming that
+            // GL_MAX_DUAL_SOURCE_DRAW_BUFFERS is *always* 1 and then only bind the basename
+            // of the variable ignoring any indices. This appears to work uniformly.
+            ASSERT(output.arraySize == 1);
+
+            mFunctions->bindFragDataLocationIndexed(mProgramID, 0, 0, "webgl_FragData");
+            mFunctions->bindFragDataLocationIndexed(mProgramID, 0, 1, "angle_SecondaryFragData");
+        }
+    }
+
     // Link and verify
     mFunctions->linkProgram(mProgramID);
 

src/libANGLE/renderer/gl/renderergl_utils.cpp

@@ -682,7 +682,6 @@ void GenerateCaps(const FunctionsGL *functions, gl::Caps *caps, gl::TextureCapsM
         functions->hasGLExtension("GL_NV_framebuffer_mixed_samples") ||
         functions->hasGLESExtension("GL_NV_framebuffer_mixed_samples");
 
-
     // NV_path_rendering
     // We also need interface query which is available in
     // >= 4.3 core or ARB_interface_query or >= GLES 3.1
@@ -696,6 +695,16 @@ void GenerateCaps(const FunctionsGL *functions, gl::Caps *caps, gl::TextureCapsM
         functions->isAtLeastGLES(gl::Version(3, 1));
 
     extensions->pathRendering = canEnableGLPathRendering || canEnableESPathRendering;
+
+    // EXT_blend_func_extended.
+    // written against OpenGL ES3.1 but can apply to earlier versions.
+    extensions->blendFuncExtended = functions->hasGLExtension("GL_ARB_blend_func_extended") ||
+                                    functions->hasGLESExtension("GL_EXT_blend_func_extended");
+    if (extensions->blendFuncExtended)
+    {
+        extensions->maxDualSourceDrawBuffers =
+            QuerySingleGLInt(functions, GL_MAX_DUAL_SOURCE_DRAW_BUFFERS_EXT);
+    }
 }
 
 void GenerateWorkarounds(const FunctionsGL *functions, WorkaroundsGL *workarounds)

src/libANGLE/validationES.cpp

@@ -99,8 +99,69 @@ bool ValidateDrawAttribs(ValidationContext *context, GLint primcount, GLint maxV
     return true;
 }
 
+bool ValidBlendEnum(const Context *context, GLenum val)
+{
+    const gl::Extensions &ext = context->getExtensions();
+
+    // these are always valid for src and dst.
+    switch (val)
+    {
+        case GL_ZERO:
+        case GL_ONE:
+        case GL_SRC_COLOR:
+        case GL_ONE_MINUS_SRC_COLOR:
+        case GL_DST_COLOR:
+        case GL_ONE_MINUS_DST_COLOR:
+        case GL_SRC_ALPHA:
+        case GL_ONE_MINUS_SRC_ALPHA:
+        case GL_DST_ALPHA:
+        case GL_ONE_MINUS_DST_ALPHA:
+        case GL_CONSTANT_COLOR:
+        case GL_ONE_MINUS_CONSTANT_COLOR:
+        case GL_CONSTANT_ALPHA:
+        case GL_ONE_MINUS_CONSTANT_ALPHA:
+            return true;
+
+        // EXT_blend_func_extended.
+        case GL_SRC1_COLOR_EXT:
+        case GL_SRC1_ALPHA_EXT:
+        case GL_ONE_MINUS_SRC1_COLOR_EXT:
+        case GL_ONE_MINUS_SRC1_ALPHA_EXT:
+        case GL_SRC_ALPHA_SATURATE_EXT:
+            return ext.blendFuncExtended;
+
+        default:
+            return false;
+    }
+}
+
 }  // anonymous namespace
 
+bool ValidSrcBlendEnum(const Context *context, GLenum val)
+{
+    if (ValidBlendEnum(context, val))
+        return true;
+
+    if (val == GL_SRC_ALPHA_SATURATE)
+        return true;
+
+    return false;
+}
+
+bool ValidDstBlendEnum(const Context *context, GLenum val)
+{
+    if (ValidBlendEnum(context, val))
+        return true;
+
+    if (val == GL_SRC_ALPHA_SATURATE)
+    {
+        if (context->getClientVersion() >= 3)
+            return true;
+    }
+
+    return false;
+}
+
 bool ValidCap(const Context *context, GLenum cap)
 {
     switch (cap)

src/libANGLE/validationES.h

@@ -27,6 +27,8 @@ class Program;
 class Shader;
 class ValidationContext;
 
+bool ValidSrcBlendEnum(const Context *context, GLenum val);
+bool ValidDstBlendEnum(const Context *context, GLenum val);
 bool ValidCap(const Context *context, GLenum cap);
 bool ValidTextureTarget(const ValidationContext *context, GLenum target);
 bool ValidTexture2DTarget(const ValidationContext *context, GLenum target);

src/libGLESv2/entry_points_gles_2_0.cpp

@@ -282,116 +282,17 @@ void GL_APIENTRY BlendFuncSeparate(GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha
           srcRGB, dstRGB, srcAlpha, dstAlpha);
 
     Context *context = GetValidGlobalContext();
-    if (context)
-    {
-        switch (srcRGB)
-        {
-          case GL_ZERO:
-          case GL_ONE:
-          case GL_SRC_COLOR:
-          case GL_ONE_MINUS_SRC_COLOR:
-          case GL_DST_COLOR:
-          case GL_ONE_MINUS_DST_COLOR:
-          case GL_SRC_ALPHA:
-          case GL_ONE_MINUS_SRC_ALPHA:
-          case GL_DST_ALPHA:
-          case GL_ONE_MINUS_DST_ALPHA:
-          case GL_CONSTANT_COLOR:
-          case GL_ONE_MINUS_CONSTANT_COLOR:
-          case GL_CONSTANT_ALPHA:
-          case GL_ONE_MINUS_CONSTANT_ALPHA:
-          case GL_SRC_ALPHA_SATURATE:
-            break;
-
-          default:
-              context->handleError(Error(GL_INVALID_ENUM));
-              return;
-        }
-
-        switch (dstRGB)
-        {
-          case GL_ZERO:
-          case GL_ONE:
-          case GL_SRC_COLOR:
-          case GL_ONE_MINUS_SRC_COLOR:
-          case GL_DST_COLOR:
-          case GL_ONE_MINUS_DST_COLOR:
-          case GL_SRC_ALPHA:
-          case GL_ONE_MINUS_SRC_ALPHA:
-          case GL_DST_ALPHA:
-          case GL_ONE_MINUS_DST_ALPHA:
-          case GL_CONSTANT_COLOR:
-          case GL_ONE_MINUS_CONSTANT_COLOR:
-          case GL_CONSTANT_ALPHA:
-          case GL_ONE_MINUS_CONSTANT_ALPHA:
-            break;
-
-          case GL_SRC_ALPHA_SATURATE:
-            if (context->getClientVersion() < 3)
-            {
-                context->handleError(Error(GL_INVALID_ENUM));
-                return;
-            }
-            break;
-
-          default:
-              context->handleError(Error(GL_INVALID_ENUM));
-            return;
-        }
 
-        switch (srcAlpha)
+    if (context)
     {
-          case GL_ZERO:
-          case GL_ONE:
-          case GL_SRC_COLOR:
-          case GL_ONE_MINUS_SRC_COLOR:
-          case GL_DST_COLOR:
-          case GL_ONE_MINUS_DST_COLOR:
-          case GL_SRC_ALPHA:
-          case GL_ONE_MINUS_SRC_ALPHA:
-          case GL_DST_ALPHA:
-          case GL_ONE_MINUS_DST_ALPHA:
-          case GL_CONSTANT_COLOR:
-          case GL_ONE_MINUS_CONSTANT_COLOR:
-          case GL_CONSTANT_ALPHA:
-          case GL_ONE_MINUS_CONSTANT_ALPHA:
-          case GL_SRC_ALPHA_SATURATE:
-            break;
-
-          default:
-              context->handleError(Error(GL_INVALID_ENUM));
-              return;
-        }
-
-        switch (dstAlpha)
+        if (!context->skipValidation())
         {
-          case GL_ZERO:
-          case GL_ONE:
-          case GL_SRC_COLOR:
-          case GL_ONE_MINUS_SRC_COLOR:
-          case GL_DST_COLOR:
-          case GL_ONE_MINUS_DST_COLOR:
-          case GL_SRC_ALPHA:
-          case GL_ONE_MINUS_SRC_ALPHA:
-          case GL_DST_ALPHA:
-          case GL_ONE_MINUS_DST_ALPHA:
-          case GL_CONSTANT_COLOR:
-          case GL_ONE_MINUS_CONSTANT_COLOR:
-          case GL_CONSTANT_ALPHA:
-          case GL_ONE_MINUS_CONSTANT_ALPHA:
-            break;
-
-          case GL_SRC_ALPHA_SATURATE:
-            if (context->getClientVersion() < 3)
+            if (!ValidSrcBlendEnum(context, srcRGB) || !ValidSrcBlendEnum(context, srcAlpha) ||
+                !ValidDstBlendEnum(context, dstRGB) || !ValidDstBlendEnum(context, dstAlpha))
             {
                 context->handleError(Error(GL_INVALID_ENUM));
                 return;
             }
-            break;
-
-          default:
-              context->handleError(Error(GL_INVALID_ENUM));
-            return;
         }
 
         if (context->getLimitations().noSimultaneousConstantColorAndAlphaBlendFunc)

src/tests/angle_end2end_tests.gypi

@@ -16,6 +16,7 @@
         'angle_end2end_tests_sources':
         [
             '<(angle_path)/src/tests/gl_tests/BindUniformLocationTest.cpp',
+            '<(angle_path)/src/tests/gl_tests/BlendFuncExtendedTest.cpp',
             '<(angle_path)/src/tests/gl_tests/BlendMinMaxTest.cpp',
             '<(angle_path)/src/tests/gl_tests/BlitFramebufferANGLETest.cpp',
             '<(angle_path)/src/tests/gl_tests/BufferDataTest.cpp',

src/tests/gl_tests/BlendFuncExtendedTest.cpp

+//
+// Copyright 2016 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.
+//
+// BlendFuncExtendedTest
+//   Test EXT_blend_func_extended
+
+#include "test_utils/ANGLETest.h"
+#include "shader_utils.h"
+
+#include <algorithm>
+#include <cmath>
+#include <fstream>
+
+using namespace angle;
+
+namespace
+{
+
+// Partial implementation of weight function for GLES 2 blend equation that
+// is dual-source aware.
+template <int factor, int index>
+float Weight(const float /*dst*/[4], const float src[4], const float src1[4])
+{
+    if (factor == GL_SRC_COLOR)
+        return src[index];
+    if (factor == GL_SRC_ALPHA)
+        return src[3];
+    if (factor == GL_SRC1_COLOR_EXT)
+        return src1[index];
+    if (factor == GL_SRC1_ALPHA_EXT)
+        return src1[3];
+    if (factor == GL_ONE_MINUS_SRC1_COLOR_EXT)
+        return 1.0f - src1[index];
+    if (factor == GL_ONE_MINUS_SRC1_ALPHA_EXT)
+        return 1.0f - src1[3];
+    return 0.0f;
+}
+
+GLubyte ScaleChannel(float weight)
+{
+    return static_cast<GLubyte>(std::floor(std::max(0.0f, std::min(1.0f, weight)) * 255.0f));
+}
+
+// Implementation of GLES 2 blend equation that is dual-source aware.
+template <int RGBs, int RGBd, int As, int Ad>
+void BlendEquationFuncAdd(const float dst[4],
+                          const float src[4],
+                          const float src1[4],
+                          angle::GLColor *result)
+{
+    float r[4];
+    r[0] = src[0] * Weight<RGBs, 0>(dst, src, src1) + dst[0] * Weight<RGBd, 0>(dst, src, src1);
+    r[1] = src[1] * Weight<RGBs, 1>(dst, src, src1) + dst[1] * Weight<RGBd, 1>(dst, src, src1);
+    r[2] = src[2] * Weight<RGBs, 2>(dst, src, src1) + dst[2] * Weight<RGBd, 2>(dst, src, src1);
+    r[3] = src[3] * Weight<As, 3>(dst, src, src1) + dst[3] * Weight<Ad, 3>(dst, src, src1);
+
+    result->R = ScaleChannel(r[0]);
+    result->G = ScaleChannel(r[1]);
+    result->B = ScaleChannel(r[2]);
+    result->A = ScaleChannel(r[3]);
+}
+
+void CheckPixels(GLint x,
+                 GLint y,
+                 GLsizei width,
+                 GLsizei height,
+                 GLint tolerance,
+                 const angle::GLColor &color)
+{
+    for (GLint yy = 0; yy < height; ++yy)
+    {
+        for (GLint xx = 0; xx < width; ++xx)
+        {
+            const auto px = x + xx;
+            const auto py = y + yy;
+            EXPECT_PIXEL_COLOR_NEAR(px, py, color, 1);
+        }
+    }
+}
+
+const GLuint kWidth  = 100;
+const GLuint kHeight = 100;
+
+class EXTBlendFuncExtendedTest : public ANGLETest
+{
+  protected:
+    bool isApplicable() const { return extensionEnabled("GL_EXT_blend_func_extended"); }
+};
+
+class EXTBlendFuncExtendedDrawTest : public ANGLETest
+{
+  protected:
+    EXTBlendFuncExtendedDrawTest() : mProgram(0)
+    {
+        setWindowWidth(kWidth);
+        setWindowHeight(kHeight);
+        setConfigRedBits(8);
+        setConfigGreenBits(8);
+        setConfigBlueBits(8);
+        setConfigAlphaBits(8);
+    }
+
+    bool isApplicable() const { return extensionEnabled("GL_EXT_blend_func_extended"); }
+
+    void SetUp() override
+    {
+        ANGLETest::SetUp();
+
+        glGenBuffers(1, &mVBO);
+        glBindBuffer(GL_ARRAY_BUFFER, mVBO);
+
+        static const float vertices[] = {
+            1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
+        };
+        glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+        ASSERT_GL_NO_ERROR();
+    }
+
+    void TearDown() override
+    {
+        glDeleteBuffers(1, &mVBO);
+        if (mProgram)
+        {
+            glDeleteProgram(mProgram);
+        }
+
+        ASSERT_GL_NO_ERROR();
+
+        ANGLETest::TearDown();
+    }
+
+    void makeProgram(const char *vertSource, const char *fragSource)
+    {
+        mProgram = CompileProgram(vertSource, fragSource);
+
+        ASSERT_NE(0u, mProgram);
+    }
+
+    void drawTest()
+    {
+        glUseProgram(mProgram);
+
+        GLint position = glGetAttribLocation(mProgram, "position");
+        GLint src0     = glGetUniformLocation(mProgram, "src0");
+        GLint src1     = glGetUniformLocation(mProgram, "src1");
+        ASSERT_GL_NO_ERROR();
+
+        glBindBuffer(GL_ARRAY_BUFFER, mVBO);
+        glEnableVertexAttribArray(position);
+        glVertexAttribPointer(position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+        ASSERT_GL_NO_ERROR();
+
+        static const float kDst[4]  = {0.5f, 0.5f, 0.5f, 0.5f};
+        static const float kSrc0[4] = {1.0f, 1.0f, 1.0f, 1.0f};
+        static const float kSrc1[4] = {0.3f, 0.6f, 0.9f, 0.7f};
+
+        glUniform4f(src0, kSrc0[0], kSrc0[1], kSrc0[2], kSrc0[3]);
+        glUniform4f(src1, kSrc1[0], kSrc1[1], kSrc1[2], kSrc1[3]);
+        ASSERT_GL_NO_ERROR();
+
+        glEnable(GL_BLEND);
+        glBlendEquation(GL_FUNC_ADD);
+        glViewport(0, 0, kWidth, kHeight);
+        glClearColor(kDst[0], kDst[1], kDst[2], kDst[3]);
+        ASSERT_GL_NO_ERROR();
+
+        {
+            glBlendFuncSeparate(GL_SRC1_COLOR_EXT, GL_SRC_ALPHA, GL_ONE_MINUS_SRC1_COLOR_EXT,
+                                GL_ONE_MINUS_SRC1_ALPHA_EXT);
+
+            glClear(GL_COLOR_BUFFER_BIT);
+            glDrawArrays(GL_TRIANGLES, 0, 6);
+            ASSERT_GL_NO_ERROR();
+
+            // verify
+            angle::GLColor color;
+            BlendEquationFuncAdd<GL_SRC1_COLOR_EXT, GL_SRC_ALPHA, GL_ONE_MINUS_SRC1_COLOR_EXT,
+                                 GL_ONE_MINUS_SRC1_ALPHA_EXT>(kDst, kSrc0, kSrc1, &color);
+
+            CheckPixels(kWidth / 4, (3 * kHeight) / 4, 1, 1, 1, color);
+            CheckPixels(kWidth - 1, 0, 1, 1, 1, color);
+        }
+
+        {
+            glBlendFuncSeparate(GL_ONE_MINUS_SRC1_COLOR_EXT, GL_ONE_MINUS_SRC_ALPHA,
+                                GL_ONE_MINUS_SRC_COLOR, GL_SRC1_ALPHA_EXT);
+
+            glClear(GL_COLOR_BUFFER_BIT);
+            glDrawArrays(GL_TRIANGLES, 0, 6);
+            ASSERT_GL_NO_ERROR();
+
+            // verify
+            angle::GLColor color;
+            BlendEquationFuncAdd<GL_ONE_MINUS_SRC1_COLOR_EXT, GL_ONE_MINUS_SRC_ALPHA,
+                                 GL_ONE_MINUS_SRC_COLOR, GL_SRC1_ALPHA_EXT>(kDst, kSrc0, kSrc1,
+                                                                            &color);
+
+            CheckPixels(kWidth / 4, (3 * kHeight) / 4, 1, 1, 1, color);
+            CheckPixels(kWidth - 1, 0, 1, 1, 1, color);
+        }
+    }
+
+    GLuint mVBO;
+    GLuint mProgram;
+};
+
+}  // namespace
+
+// Test EXT_blend_func_extended related gets.
+TEST_P(EXTBlendFuncExtendedTest, TestMaxDualSourceDrawBuffers)
+{
+    if (!isApplicable())
+        return;
+
+    GLint maxDualSourceDrawBuffers = 0;
+    glGetIntegerv(GL_MAX_DUAL_SOURCE_DRAW_BUFFERS_EXT, &maxDualSourceDrawBuffers);
+    EXPECT_GT(maxDualSourceDrawBuffers, 0);
+
+    ASSERT_GL_NO_ERROR();
+}
+
+// Test a shader with EXT_blend_func_extended and gl_SecondaryFragColorEXT.
+// Outputs to primary color buffer using primary and secondary colors.
+TEST_P(EXTBlendFuncExtendedDrawTest, FragColor)
+{
+    if (!isApplicable())
+        return;
+
+    const char *kVertexShader =
+        "attribute vec4 position;\n"
+        "void main() {\n"
+        "  gl_Position = position;\n"
+        "}\n";
+
+    const char *kFragColorShader =
+        "#extension GL_EXT_blend_func_extended : require\n"
+        "precision mediump float;\n"
+        "uniform vec4 src0;\n"
+        "uniform vec4 src1;\n"
+        "void main() {\n"
+        "  gl_FragColor = src0;\n"
+        "  gl_SecondaryFragColorEXT = src1;\n"
+        "}\n";
+
+    makeProgram(kVertexShader, kFragColorShader);
+
+    drawTest();
+}
+
+// Test a shader with EXT_blend_func_extended and gl_FragData.
+// Outputs to a color buffer using primary and secondary frag data.
+TEST_P(EXTBlendFuncExtendedDrawTest, FragData)
+{
+    if (!isApplicable())
+        return;
+
+    const char *kVertexShader =
+        "attribute vec4 position;\n"
+        "void main() {\n"
+        "  gl_Position = position;\n"
+        "}\n";
+
+    const char *kFragColorShader =
+        "#extension GL_EXT_blend_func_extended : require\n"
+        "precision mediump float;\n"
+        "uniform vec4 src0;\n"
+        "uniform vec4 src1;\n"
+        "void main() {\n"
+        "  gl_FragData[0] = src0;\n"
+        "  gl_SecondaryFragDataEXT[0] = src1;\n"
+        "}\n";
+
+    makeProgram(kVertexShader, kFragColorShader);
+
+    drawTest();
+}
+
+ANGLE_INSTANTIATE_TEST(EXTBlendFuncExtendedTest,
+                       ES2_OPENGL(),
+                       ES2_OPENGLES(),
+                       ES3_OPENGL(),
+                       ES3_OPENGLES());
+ANGLE_INSTANTIATE_TEST(EXTBlendFuncExtendedDrawTest, ES2_OPENGL(), ES2_OPENGLES());