Add tokens and entry points for KHR_blend_equation_advanced

src/gpu/gl/GrGLAssembleInterface.cpp

Index: src/gpu/gl/GrGLAssembleInterface.cpp
diff --git a/src/gpu/gl/GrGLAssembleInterface.cpp b/src/gpu/gl/GrGLAssembleInterface.cpp
index c91da9e6c732fc06c9453fb8174c69e4352196d5..55283599e952f3a6363970a74b1876b8b2c1deed 100644
--- a/src/gpu/gl/GrGLAssembleInterface.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface.cpp
@@ -70,7 +70,10 @@ const GrGLInterface* GrGLAssembleGLInterface(void* ctx, GrGLGetProc get) {
     }
     GET_PROC(BeginQuery);
     GET_PROC(BindTexture);
-    GET_PROC(BlendFunc);
+
+    if (extensions.has("GL_KHR_blend_equation_advanced")) {
+        GET_PROC_SUFFIX(BlendBarrier, KHR);
+    }
 
     if (glVer >= GR_GL_VER(1,4) ||
         extensions.has("GL_ARB_imaging") ||
@@ -78,6 +81,13 @@ const GrGLInterface* GrGLAssembleGLInterface(void* ctx, GrGLGetProc get) {
         GET_PROC(BlendColor);
     }
 
+    if (glVer >= GR_GL_VER(1,4) ||
+        extensions.has("GL_ARB_imaging") ||
+        extensions.has("GL_EXT_blend_subtract")) {
+        GET_PROC(BlendEquation);

[Mark Kilgard, 2015/04/02 22:41:43]

technically, EXT_blend_subtract (which requires EXT_blend_minmax) would get a
glBlendEquationEXT routine

I think it is safe to just assume 1.4 or ARB_imaging

anything supporting *just* EXT_blend_equation_subtract would be ancient

[Chris Dalton, 2015/04/17 07:53:42]

Agreed. However, I did it this way to mimic how glBlendColor is loaded above.
That one also had the bug of not loading glBlendColorEXT with the EXT...

I fixed them both in patch 2 to load the EXT, but if the general consensus is to
just ignore the EXT versions completely I don't mind going that route either.

+    }
+
+    GET_PROC(BlendFunc);
     GET_PROC(BufferData);
     GET_PROC(BufferSubData);
     GET_PROC(Clear);
@@ -332,7 +342,13 @@ const GrGLInterface* GrGLAssembleGLESInterface(void* ctx, GrGLGetProc get) {
     GET_PROC(BindBuffer);
     GET_PROC(BindTexture);
     GET_PROC_SUFFIX(BindVertexArray, OES);
+
+    if (extensions.has("GL_KHR_blend_equation_advanced")) {
+        GET_PROC_SUFFIX(BlendBarrier, KHR);
+    }
+
     GET_PROC(BlendColor);
+    GET_PROC(BlendEquation);
     GET_PROC(BlendFunc);
     GET_PROC(BufferData);
     GET_PROC(BufferSubData);