Use D3D11 backend for ANGLE when available.

src/gpu/gl/angle/SkANGLEGLContext.cpp

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gl/angle/SkANGLEGLContext.h"
 
+#define EGL_PLATFORM_ANGLE_ANGLE                0x3201
+#define EGL_PLATFORM_ANGLE_TYPE_ANGLE           0x3202
+#define EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE      0x3206
+#define EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE     0x3207
+
+EGLDisplay SkANGLEGLContext::GetD3DEGLDisplay(EGLNativeDisplayType nativeDisplay) {
+
+    typedef EGLDisplay (*EGLGetPlatformDisplayEXT)(EGLenum platform,
+                                                   void *native_display,
+                                                   const EGLint *attrib_list);
+    EGLGetPlatformDisplayEXT eglGetPlatformDisplayEXT;
+    eglGetPlatformDisplayEXT =
+        (EGLGetPlatformDisplayEXT) eglGetProcAddress("eglGetPlatformDisplayEXT");
+
+    if (!eglGetPlatformDisplayEXT) {
+        return eglGetDisplay(nativeDisplay);
+    }
+
+    // Try for an ANGLE D3D11 context, fall back to D3D9.
+    EGLint attribs[2][3] = {
+        {
+            EGL_PLATFORM_ANGLE_TYPE_ANGLE,
+            EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
+            EGL_NONE
+        },
+        {
+            EGL_PLATFORM_ANGLE_TYPE_ANGLE,
+            EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE,
+            EGL_NONE
+        }
+    };
+
+    EGLDisplay display = EGL_NO_DISPLAY;
+    for (int i = 0; i < 2 && display == EGL_NO_DISPLAY; ++i) {
+        display = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE,
+                                            nativeDisplay, attribs[i]);
+    }
+    return display;
+}
+
 SkANGLEGLContext::SkANGLEGLContext()
     : fContext(EGL_NO_CONTEXT)
     , fDisplay(EGL_NO_DISPLAY)
     , fSurface(EGL_NO_SURFACE) {
-    fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
-
-    EGLint majorVersion;
-    EGLint minorVersion;
-    eglInitialize(fDisplay, &majorVersion, &minorVersion);
 
     EGLint numConfigs;
     static const EGLint configAttribs[] = {
         EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
         EGL_RED_SIZE, 8,
         EGL_GREEN_SIZE, 8,
         EGL_BLUE_SIZE, 8,
         EGL_ALPHA_SIZE, 8,
         EGL_NONE
     };
 
+    fDisplay = GetD3DEGLDisplay(EGL_DEFAULT_DISPLAY);
+    if (EGL_NO_DISPLAY == fDisplay) {
+        SkDebugf("Could not create EGL display!");
+        return;
+    }
+
+    EGLint majorVersion;
+    EGLint minorVersion;
+    eglInitialize(fDisplay, &majorVersion, &minorVersion);
+
     EGLConfig surfaceConfig;
     eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs);
 
     static const EGLint contextAttribs[] = {
         EGL_CONTEXT_CLIENT_VERSION, 2,
         EGL_NONE
     };
     fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, contextAttribs);
 
 
     static const EGLint surfaceAttribs[] = {
-            EGL_WIDTH, 1,
-            EGL_HEIGHT, 1,
-            EGL_NONE
-        };
+        EGL_WIDTH, 1,
+        EGL_HEIGHT, 1,
+        EGL_NONE
+    };
+
     fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, surfaceAttribs);
 
     eglMakeCurrent(fDisplay, fSurface, fSurface, fContext);
 
     fGL.reset(GrGLCreateANGLEInterface());
     if (NULL == fGL.get()) {
         SkDebugf("Could not create ANGLE GL interface!\n");
         this->destroyGLContext();
         return;
     }
@@ skipping 32 matching lines @@
     if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
         SkDebugf("Could not set the context.\n");
     }
 }
 
 void SkANGLEGLContext::swapBuffers() const {
     if (!eglSwapBuffers(fDisplay, fSurface)) {
         SkDebugf("Could not complete eglSwapBuffers.\n");
     }
 }