Support using OpenGL ES context on desktop

src/gpu/gl/win/SkNativeGLContext_win.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"
 #include "SkWGL.h"
@@ skipping 29 matching lines @@
         wglDeleteContext(fGlRenderContext);
     }
     if (fWindow && fDeviceContext) {
         ReleaseDC(fWindow, fDeviceContext);
     }
     if (fWindow) {
         DestroyWindow(fWindow);
     }
 }
 
-const GrGLInterface* SkNativeGLContext::createGLContext() {
+const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
     HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
 
     if (!gWC) {
         WNDCLASS wc;
         wc.cbClsExtra = 0;
         wc.cbWndExtra = 0;
         wc.hbrBackground = NULL;
         wc.hCursor = LoadCursor(NULL, IDC_ARROW);
         wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
         wc.hInstance = hInstance;
@@ skipping 17 matching lines @@
                                  hInstance, NULL))) {
         SkDebugf("Could not create window.\n");
         return NULL;
     }
 
     if (!(fDeviceContext = GetDC(fWindow))) {
         SkDebugf("Could not get device context.\n");
         this->destroyGLContext();
         return NULL;
     }
+    // Requesting a Core profile would bar us from using NVPR. So we request
+    // compatibility profile or GL ES.
+    SkWGLContextRequest contextType =
+        kGLES_GrGLStandard == forcedGpuAPI ?
+        kGLES_SkWGLContextRequest : kGLPreferCompatibilityProfile_SkWGLContextRequest;
 
-    // Requesting a Core profile would bar us from using NVPR. So we pass false.
-    if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, false))) {
+    if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, contextType))) {
         SkDebugf("Could not create rendering context.\n");
         this->destroyGLContext();
         return NULL;
     }
 
     if (!(wglMakeCurrent(fDeviceContext, fGlRenderContext))) {
         SkDebugf("Could not set the context.\n");
         this->destroyGLContext();
         return NULL;
     }
@@ skipping 11 matching lines @@
     if (!wglMakeCurrent(fDeviceContext, fGlRenderContext)) {
         SkDebugf("Could not create rendering context.\n");
     }
 }
 
 void SkNativeGLContext::swapBuffers() const {
     if (!SwapBuffers(fDeviceContext)) {
         SkDebugf("Could not complete SwapBuffers.\n");
     }
 }