Support using OpenGL ES context on desktop

src/gpu/gl/android/SkNativeGLContext_android.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/SkNativeGLContext.h"
 
 SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
@@ skipping 33 matching lines @@
         if (fSurface) {
             eglDestroySurface(fDisplay, fSurface);
             fSurface = EGL_NO_SURFACE;
         }
 
         //TODO should we close the display?
         fDisplay = EGL_NO_DISPLAY;
     }
 }
 
-const GrGLInterface* SkNativeGLContext::createGLContext() {
+const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
     static const EGLint kEGLContextAttribsForOpenGL[] = {
         EGL_NONE
     };
 
     static const EGLint kEGLContextAttribsForOpenGLES[] = {
         EGL_CONTEXT_CLIENT_VERSION, 2,
         EGL_NONE
     };
 
     static const struct {
         const EGLint* fContextAttribs;
         EGLenum fAPI;
         EGLint  fRenderableTypeBit;
         GrGLStandard fStandard;
     } kAPIs[] = {
         {   // OpenGL
             kEGLContextAttribsForOpenGL,
             EGL_OPENGL_API,
             EGL_OPENGL_BIT,
             kGL_GrGLStandard
         },
         {   // OpenGL ES. This seems to work for both ES2 and 3 (when available).
             kEGLContextAttribsForOpenGLES,
             EGL_OPENGL_ES_API,
             EGL_OPENGL_ES2_BIT,
             kGLES_GrGLStandard
         },
     };
 
+    size_t apiLimit = SK_ARRAY_COUNT(kAPIs);
+    size_t api = 0;
+    if (forcedGpuAPI == kGL_GrGLStandard) {
+        apiLimit = 1;
+    } else if (forcedGpuAPI == kGLES_GrGLStandard) {
+        api = 1;
+    }
+    SkASSERT(forcedGpuAPI == kNone_GrGLStandard || kAPIs[api].fStandard == forcedGpuAPI);
+
     const GrGLInterface* interface = NULL;
 
-    for (size_t api = 0; NULL == interface && api < SK_ARRAY_COUNT(kAPIs); ++api) {
+    for (size_t i = 0; NULL == interface && i < apiLimit; ++api) {

[tomhudson, 2014/09/10 14:46:52]

Note that this is a bug that happened to get past code review and not kill us on
most platforms, but surfaces on some platforms. Fix incoming.

         fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
 
         EGLint majorVersion;
         EGLint minorVersion;
         eglInitialize(fDisplay, &majorVersion, &minorVersion);
 
 #if 0
         SkDebugf("VENDOR: %s\n", eglQueryString(fDisplay, EGL_VENDOR));
         SkDebugf("APIS: %s\n", eglQueryString(fDisplay, EGL_CLIENT_APIS));
         SkDebugf("VERSION: %s\n", eglQueryString(fDisplay, EGL_VERSION));
@@ skipping 67 matching lines @@
     if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
         SkDebugf("Could not set the context.\n");
     }
 }
 
 void SkNativeGLContext::swapBuffers() const {
     if (!eglSwapBuffers(fDisplay, fSurface)) {
         SkDebugf("Could not complete eglSwapBuffers.\n");
     }
 }