Support using OpenGL ES context on desktop

Support using OpenGL ES context on desktop for unix and Android platforms. This
is mainly useful in development.

Add --gpuAPI flag to gm, dm, bench, bench_pictures and render_pictures. The
possible parameters for the flag are "gl" and "gles".

R=bsalomon@google.com, mtklein@google.com, robertphillips@google.com

Author: kkinnunen@nvidia.com

Review URL: https://codereview.chromium.org/319043005

2 files changed, 28 insertions, 4 deletions

diff --git a/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp b/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp
index 6adaf1964f..d63dfbbcd6 100644
--- a/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp
+++ b/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp
@@ -8,9 +8,21 @@
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLAssembleInterface.h"
+#include "gl/GrGLUtil.h"
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
+#include <GL/gl.h>
+
+#define GET_PROC(F) functions->f ## F = (GrGL ## F ## Proc) get(ctx, "gl" #F)
+#define GET_PROC_SUFFIX(F, S) functions->f ## F = (GrGL ## F ## Proc) get(ctx, "gl" #F #S)
+#define GET_PROC_LOCAL(F) GrGL ## F ## Proc F = (GrGL ## F ## Proc) get(ctx, "gl" #F)
+
+#define GET_LINKED GET_PROC
+#define GET_LINKED_SUFFIX GET_PROC_SUFFIX
+
+#include "gl/GrGLAssembleGLESInterface.h"
+
 class AutoLibraryUnload {
 public:
     AutoLibraryUnload(const char* moduleName) {
@@ -70,5 +82,13 @@ const GrGLInterface* GrGLCreateNativeInterface() {
         return NULL;
     }
 
-    return GrGLAssembleGLInterface(&getter, win_get_gl_proc);
+    const char* verStr = reinterpret_cast<const char*>(glGetString(GR_GL_VERSION));
+    GrGLStandard standard = GrGLGetStandardInUseFromString(verStr);
+
+    if (kGLES_GrGLStandard == standard) {
+        return GrGLAssembleGLESInterface(&getter, win_get_gl_proc);
+    } else if (kGL_GrGLStandard == standard) {
+        return GrGLAssembleGLInterface(&getter, win_get_gl_proc);
+    }
+    return NULL;
 }
diff --git a/src/gpu/gl/win/SkNativeGLContext_win.cpp b/src/gpu/gl/win/SkNativeGLContext_win.cpp
index bae97a780c..f085fdc6ee 100644
--- a/src/gpu/gl/win/SkNativeGLContext_win.cpp
+++ b/src/gpu/gl/win/SkNativeGLContext_win.cpp
@@ -47,7 +47,7 @@ void SkNativeGLContext::destroyGLContext() {
     }
 }
 
-const GrGLInterface* SkNativeGLContext::createGLContext() {
+const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
     HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
 
     if (!gWC) {
@@ -85,9 +85,13 @@ const GrGLInterface* SkNativeGLContext::createGLContext() {
         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;