Revert of Make the Sk GL context class an abstract base class

src/gpu/gl/egl/SkNativeGLContext_egl.cpp

Index: src/gpu/gl/egl/SkNativeGLContext_egl.cpp
diff --git a/src/gpu/gl/egl/SkNativeGLContext_egl.cpp b/src/gpu/gl/egl/SkNativeGLContext_egl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d4d7219b5bbbf7a3799e367d7102288cfa382abc
--- /dev/null
+++ b/src/gpu/gl/egl/SkNativeGLContext_egl.cpp
@@ -0,0 +1,182 @@
+
+/*
+ * 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() {
+    fOldEGLContext = eglGetCurrentContext();
+    fOldDisplay = eglGetCurrentDisplay();
+    fOldSurface = eglGetCurrentSurface(EGL_DRAW);
+
+}
+
+SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
+    if (fOldDisplay) {
+        eglMakeCurrent(fOldDisplay, fOldSurface, fOldSurface, fOldEGLContext);
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkNativeGLContext::SkNativeGLContext()
+    : fContext(EGL_NO_CONTEXT)
+    , fDisplay(EGL_NO_DISPLAY)
+    , fSurface(EGL_NO_SURFACE) {
+}
+
+SkNativeGLContext::~SkNativeGLContext() {
+    this->destroyGLContext();
+}
+
+void SkNativeGLContext::destroyGLContext() {
+    if (fDisplay) {
+        eglMakeCurrent(fDisplay, 0, 0, 0);
+
+        if (fContext) {
+            eglDestroyContext(fDisplay, fContext);
+            fContext = EGL_NO_CONTEXT;
+        }
+
+        if (fSurface) {
+            eglDestroySurface(fDisplay, fSurface);
+            fSurface = EGL_NO_SURFACE;
+        }
+
+        //TODO should we close the display?
+        fDisplay = EGL_NO_DISPLAY;
+    }
+}
+
+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 (; NULL == interface && api < apiLimit; ++api) {
+        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));
+        SkDebugf("EXTENSIONS %s\n", eglQueryString(fDisplay, EGL_EXTENSIONS));
+#endif
+
+        if (!eglBindAPI(kAPIs[api].fAPI)) {
+            continue;
+        }
+
+        EGLint numConfigs;
+        const EGLint configAttribs[] = {
+            EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+            EGL_RENDERABLE_TYPE, kAPIs[api].fRenderableTypeBit,
+            EGL_RED_SIZE, 8,
+            EGL_GREEN_SIZE, 8,
+            EGL_BLUE_SIZE, 8,
+            EGL_ALPHA_SIZE, 8,
+            EGL_NONE
+        };
+
+        EGLConfig surfaceConfig;
+        if (!eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs)) {
+            SkDebugf("eglChooseConfig failed. EGL Error: 0x%08x\n", eglGetError());
+            continue;
+        }
+
+        fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, kAPIs[api].fContextAttribs);
+        if (EGL_NO_CONTEXT == fContext) {
+            SkDebugf("eglCreateContext failed.  EGL Error: 0x%08x\n", eglGetError());
+            continue;
+        }
+
+        static const EGLint kSurfaceAttribs[] = {
+            EGL_WIDTH, 1,
+            EGL_HEIGHT, 1,
+            EGL_NONE
+        };
+
+        fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, kSurfaceAttribs);
+        if (EGL_NO_SURFACE == fSurface) {
+            SkDebugf("eglCreatePbufferSurface failed. EGL Error: 0x%08x\n", eglGetError());
+            this->destroyGLContext();
+            continue;
+        }
+
+        if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
+            SkDebugf("eglMakeCurrent failed.  EGL Error: 0x%08x\n", eglGetError());
+            this->destroyGLContext();
+            continue;
+        }
+
+        interface = GrGLCreateNativeInterface();
+        if (NULL == interface) {
+            SkDebugf("Failed to create gl interface.\n");
+            this->destroyGLContext();
+            continue;
+        }
+
+        if (!interface->validate()) {
+            interface->unref();
+            interface = NULL;
+            this->destroyGLContext();
+        }
+    }
+
+    return interface;
+}
+
+void SkNativeGLContext::makeCurrent() const {
+    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");
+    }
+}