Make the Sk GL context class an abstract base class

src/gpu/gl/win/SkNativeGLContext_win.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"
-
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-
-SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
-    fOldHGLRC = wglGetCurrentContext();
-    fOldHDC = wglGetCurrentDC();
-}
-
-SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
-    wglMakeCurrent(fOldHDC, fOldHGLRC);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-ATOM SkNativeGLContext::gWC = 0;
-
-SkNativeGLContext::SkNativeGLContext()
-    : fWindow(NULL)
-    , fDeviceContext(NULL)
-    , fGlRenderContext(0)
-    , fPbufferContext(NULL) {
-}
-
-SkNativeGLContext::~SkNativeGLContext() {
-    this->destroyGLContext();
-}
-
-void SkNativeGLContext::destroyGLContext() {
-    SkSafeSetNull(fPbufferContext);
-    if (fGlRenderContext) {
-        wglDeleteContext(fGlRenderContext);
-        fGlRenderContext = 0;
-    }
-    if (fWindow && fDeviceContext) {
-        ReleaseDC(fWindow, fDeviceContext);
-        fDeviceContext = 0;
-    }
-    if (fWindow) {
-        DestroyWindow(fWindow);
-        fWindow = 0;
-    }
-}
-
-const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
-    HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
-
-    if (!gWC) {
-        WNDCLASS wc;
-        wc.cbClsExtra = 0;
-        wc.cbWndExtra = 0;
-        wc.hbrBackground = NULL;
-        wc.hCursor = LoadCursor(NULL, IDC_ARROW);
-        wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
-        wc.hInstance = hInstance;
-        wc.lpfnWndProc = (WNDPROC) DefWindowProc;
-        wc.lpszClassName = TEXT("Griffin");
-        wc.lpszMenuName = NULL;
-        wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
-
-        gWC = RegisterClass(&wc);
-        if (!gWC) {
-            SkDebugf("Could not register window class.\n");
-            return NULL;
-        }
-    }
-
-    if (!(fWindow = CreateWindow(TEXT("Griffin"),
-                                 TEXT("The Invisible Man"),
-                                 WS_OVERLAPPEDWINDOW,
-                                 0, 0, 1, 1,
-                                 NULL, NULL,
-                                 hInstance, NULL))) {
-        SkDebugf("Could not create window.\n");
-        return NULL;
-    }
-
-    if (!(fDeviceContext = GetDC(fWindow))) {
-        SkDebugf("Could not get device context.\n");
-        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;
-
-    fPbufferContext = SkWGLPbufferContext::Create(fDeviceContext, 0, contextType);
-
-    HDC dc;
-    HGLRC glrc;
-
-    if (NULL == fPbufferContext) {
-        if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, contextType))) {
-            SkDebugf("Could not create rendering context.\n");
-            this->destroyGLContext();
-            return NULL;
-        }
-        dc = fDeviceContext;
-        glrc = fGlRenderContext;
-    } else {
-        ReleaseDC(fWindow, fDeviceContext);
-        fDeviceContext = 0;
-        DestroyWindow(fWindow);
-        fWindow = 0;
-
-        dc = fPbufferContext->getDC();
-        glrc = fPbufferContext->getGLRC();
-    }
-
-    if (!(wglMakeCurrent(dc, glrc))) {
-        SkDebugf("Could not set the context.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    const GrGLInterface* interface = GrGLCreateNativeInterface();
-    if (NULL == interface) {
-        SkDebugf("Could not create GL interface.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    return interface;
-}
-
-void SkNativeGLContext::makeCurrent() const {
-    HDC dc;
-    HGLRC glrc;
-
-    if (NULL == fPbufferContext) {
-        dc = fDeviceContext;
-        glrc = fGlRenderContext;
-    } else {
-        dc = fPbufferContext->getDC();
-        glrc = fPbufferContext->getGLRC();
-    }
-
-    if (!wglMakeCurrent(dc, glrc)) {
-        SkDebugf("Could not create rendering context.\n");
-    }
-}
-
-void SkNativeGLContext::swapBuffers() const {
-    HDC dc;
-
-    if (NULL == fPbufferContext) {
-        dc = fDeviceContext;
-    } else {
-        dc = fPbufferContext->getDC();
-    }
-    if (!SwapBuffers(dc)) {
-        SkDebugf("Could not complete SwapBuffers.\n");
-    }
-}