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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #include "gl/SkNativeGLContext.h"
     10 #include "SkWGL.h"
     11 
     12 #define WIN32_LEAN_AND_MEAN
     13 #include <windows.h>
     14 
     15 SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
     16     fOldHGLRC = wglGetCurrentContext();
     17     fOldHDC = wglGetCurrentDC();
     18 }
     19 
     20 SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
     21     wglMakeCurrent(fOldHDC, fOldHGLRC);
     22 }
     23 
     24 ///////////////////////////////////////////////////////////////////////////////
     25 
     26 ATOM SkNativeGLContext::gWC = 0;
     27 
     28 SkNativeGLContext::SkNativeGLContext()
     29     : fWindow(NULL)
     30     , fDeviceContext(NULL)
     31     , fGlRenderContext(0) {
     32 }
     33 
     34 SkNativeGLContext::~SkNativeGLContext() {
     35     this->destroyGLContext();
     36 }
     37 
     38 void SkNativeGLContext::destroyGLContext() {
     39     if (fGlRenderContext) {
     40         wglDeleteContext(fGlRenderContext);
     41     }
     42     if (fWindow && fDeviceContext) {
     43         ReleaseDC(fWindow, fDeviceContext);
     44     }
     45     if (fWindow) {
     46         DestroyWindow(fWindow);
     47     }
     48 }
     49 
     50 const GrGLInterface* SkNativeGLContext::createGLContext() {
     51     HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
     52 
     53     if (!gWC) {
     54         WNDCLASS wc;
     55         wc.cbClsExtra = 0;
     56         wc.cbWndExtra = 0;
     57         wc.hbrBackground = NULL;
     58         wc.hCursor = LoadCursor(NULL, IDC_ARROW);
     59         wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
     60         wc.hInstance = hInstance;
     61         wc.lpfnWndProc = (WNDPROC) DefWindowProc;
     62         wc.lpszClassName = TEXT("Griffin");
     63         wc.lpszMenuName = NULL;
     64         wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
     65 
     66         gWC = RegisterClass(&wc);
     67         if (!gWC) {
     68             SkDebugf("Could not register window class.\n");
     69             return NULL;
     70         }
     71     }
     72 
     73     if (!(fWindow = CreateWindow(TEXT("Griffin"),
     74                                  TEXT("The Invisible Man"),
     75                                  WS_OVERLAPPEDWINDOW,
     76                                  0, 0, 1, 1,
     77                                  NULL, NULL,
     78                                  hInstance, NULL))) {
     79         SkDebugf("Could not create window.\n");
     80         return NULL;
     81     }
     82 
     83     if (!(fDeviceContext = GetDC(fWindow))) {
     84         SkDebugf("Could not get device context.\n");
     85         this->destroyGLContext();
     86         return NULL;
     87     }
     88 
     89     // Requesting a Core profile would bar us from using NVPR. So we pass false.
     90     if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, false))) {
     91         SkDebugf("Could not create rendering context.\n");
     92         this->destroyGLContext();
     93         return NULL;
     94     }
     95 
     96     if (!(wglMakeCurrent(fDeviceContext, fGlRenderContext))) {
     97         SkDebugf("Could not set the context.\n");
     98         this->destroyGLContext();
     99         return NULL;
    100     }
    101     const GrGLInterface* interface = GrGLCreateNativeInterface();
    102     if (NULL == interface) {
    103         SkDebugf("Could not create GL interface.\n");
    104         this->destroyGLContext();
    105         return NULL;
    106     }
    107 
    108     return interface;
    109 }
    110 
    111 void SkNativeGLContext::makeCurrent() const {
    112     if (!wglMakeCurrent(fDeviceContext, fGlRenderContext)) {
    113         SkDebugf("Could not create rendering context.\n");
    114     }
    115 }
    116 
    117 void SkNativeGLContext::swapBuffers() const {
    118     if (!SwapBuffers(fDeviceContext)) {
    119         SkDebugf("Could not complete SwapBuffers.\n");
    120     }
    121 }
    122