Make the Sk GL context class an abstract base class

src/gpu/gl/egl/SkNativeGLContext_egl.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"
-
-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");
-    }
-}