Add onGetBlendInfo to GrXferProcessor

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 96 matching lines @@
     if (!fExtensions.isInitialized()) {
         RETURN_FALSE_INTERFACE
     }
 
     // functions that are always required
     if (NULL == fFunctions.fActiveTexture ||
         NULL == fFunctions.fAttachShader ||
         NULL == fFunctions.fBindAttribLocation ||
         NULL == fFunctions.fBindBuffer ||
         NULL == fFunctions.fBindTexture ||
+        NULL == fFunctions.fBlendColor ||      // -> GL >= 1.4 or extension, ES >= 2.0
+        NULL == fFunctions.fBlendEquation ||   // -> GL >= 1.4 or extension, ES >= 2.0
         NULL == fFunctions.fBlendFunc ||
-        NULL == fFunctions.fBlendColor ||      // -> GL >= 1.4, ES >= 2.0 or extension
         NULL == fFunctions.fBufferData ||
         NULL == fFunctions.fBufferSubData ||
         NULL == fFunctions.fClear ||
         NULL == fFunctions.fClearColor ||
         NULL == fFunctions.fClearStencil ||
         NULL == fFunctions.fColorMask ||
         NULL == fFunctions.fCompileShader ||
         NULL == fFunctions.fCopyTexSubImage2D ||
         NULL == fFunctions.fCreateProgram ||
         NULL == fFunctions.fCreateShader ||
@@ skipping 170 matching lines @@
             if (NULL == fFunctions.fTexStorage2D) {
                 RETURN_FALSE_INTERFACE
             }
         }
     } else if (glVer >= GR_GL_VER(3,0) || fExtensions.has("GL_EXT_texture_storage")) {
         if (NULL == fFunctions.fTexStorage2D) {
             RETURN_FALSE_INTERFACE
         }
     }
 
+    // glTextureBarrier is part of desktop 4.5. There are also ARB and NV extensions.
+    if (kGL_GrGLStandard == fStandard) {
+        if (glVer >= GR_GL_VER(4,5) ||
+            fExtensions.has("GL_ARB_texture_barrier") ||
+            fExtensions.has("GL_NV_texture_barrier")) {
+            if (NULL == fFunctions.fTextureBarrier) {
+                RETURN_FALSE_INTERFACE
+            }
+        }
+    } else if (fExtensions.has("GL_NV_texture_barrier")) {
+        if (NULL == fFunctions.fTextureBarrier) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
+    if (fExtensions.has("GL_KHR_blend_equation_advanced") ||
+        fExtensions.has("GL_NV_blend_equation_advanced")) {
+        if (NULL == fFunctions.fBlendBarrier) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
     if (fExtensions.has("GL_EXT_discard_framebuffer")) {
 // FIXME: Remove this once Chromium is updated to provide this function
 #if 0
         if (NULL == fFunctions.fDiscardFramebuffer) {
             RETURN_FALSE_INTERFACE
         }
 #endif
     }
 
     // FBO MSAA
@@ skipping 187 matching lines @@
     }
 
     if (fExtensions.has("GL_NV_framebuffer_mixed_samples")) {
         if (NULL == fFunctions.fCoverageModulation) {
             RETURN_FALSE_INTERFACE
         }
     }
 
     return true;
 }