skia: add ability to load command_buffer_gles2

include/gpu/gl/command_buffer/SkCommandBufferGLContext.h

+
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SKCOMMANDBUFFERGLCONTEXT_DEFINED
+#define SKCOMMANDBUFFERGLCONTEXT_DEFINED
+
+#if SK_COMMAND_BUFFER
+
+#include "gl/SkGLContext.h"
+
+class SkCommandBufferGLContext : public SkGLContext {
+public:
+    ~SkCommandBufferGLContext() override;
+
+    static SkCommandBufferGLContext* Create(GrGLStandard forcedGpuAPI) {
+        if (kGL_GrGLStandard == forcedGpuAPI) {
+            return nullptr;
+        }
+        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext;
+        if (!ctx->isValid()) {
+            delete ctx;
+            return nullptr;
+        }
+        return ctx;
+    }
+
+    static SkCommandBufferGLContext* Create(void* nativeWindow, int msaaSampleCount) {
+        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext(nativeWindow,
+                                                                     msaaSampleCount);
+        if (!ctx->isValid()) {
+            delete ctx;
+            return nullptr;
+        }
+        return ctx;
+    }
+
+    void presentCommandBuffer();
+
+    bool makeCurrent();
+    int getStencilBits();
+    int getSampleCount();
+
+private:
+    SkCommandBufferGLContext();
+    SkCommandBufferGLContext(void* nativeWindow, int msaaSampleCount);
+    void initializeGLContext(void* nativeWindow, const int* configAttribs,
+                             const int* surfaceAttribs);
+    void destroyGLContext();
+
+    void onPlatformMakeCurrent() const override;
+    void onPlatformSwapBuffers() const override;
+    GrGLFuncPtr onPlatformGetProcAddress(const char* name) const override;
+
+    void* fContext;
+    void* fDisplay;
+    void* fSurface;
+    void* fConfig;
+};
+
+#endif // SK_COMMAND_BUFFER
+
+#endif