Support using OpenGL ES context on desktop

src/gpu/gl/mesa/SkMesaGLContext.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/osmesa.h>
 
@@ skipping 35 matching lines @@
     }
 
     if (fContext) {
         OSMesaDestroyContext((OSMesaContext)fContext);
         fContext = static_cast<Context>(NULL);
     }
 }
 
 static const GrGLint gBOGUS_SIZE = 16;
 
-const GrGLInterface* SkMesaGLContext::createGLContext() {
+const GrGLInterface* SkMesaGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
+    if (kGLES_GrGLStandard == forcedGpuAPI) {
+        return NULL;
+    }
+
     /* Create an RGBA-mode context */
 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
     /* specify Z, stencil, accum sizes */
     fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, NULL);
 #else
     fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, NULL);
 #endif
     if (!fContext) {
         SkDebugf("OSMesaCreateContext failed!\n");
         this->destroyGLContext();
@@ skipping 32 matching lines @@
 void SkMesaGLContext::makeCurrent() const {
     if (fContext) {
         if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage,
                                GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
             SkDebugf("Could not make MESA context current.");
         }
     }
 }
 
 void SkMesaGLContext::swapBuffers() const { }