src/third_party/skia/src/gpu/gl/win/SkNativeGLContext_win.cpp

   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
  11 #define WIN32_LEAN_AND_MEAN
  12 #include <windows.h>
  13
  14 SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
  15     fOldHGLRC = wglGetCurrentContext();
  16     fOldHDC = wglGetCurrentDC();
  17 }
  18
  19 SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
  20     wglMakeCurrent(fOldHDC, fOldHGLRC);
  21 }
  22
  23 ///////////////////////////////////////////////////////////////////////////////
  24
  25 ATOM SkNativeGLContext::gWC = 0;
  26
  27 SkNativeGLContext::SkNativeGLContext()
  28     : fWindow(NULL)
  29     , fDeviceContext(NULL)
  30     , fGlRenderContext(0)
  31     , fPbufferContext(NULL) {
  32 }
  33
  34 SkNativeGLContext::~SkNativeGLContext() {
  35     this->destroyGLContext();
  36 }
  37
  38 void SkNativeGLContext::destroyGLContext() {
  39     SkSafeSetNull(fPbufferContext);
  40     if (fGlRenderContext) {
  41         wglDeleteContext(fGlRenderContext);
  42         fGlRenderContext = 0;
  43     }
  44     if (fWindow && fDeviceContext) {
  45         ReleaseDC(fWindow, fDeviceContext);
  46         fDeviceContext = 0;
  47     }
  48     if (fWindow) {
  49         DestroyWindow(fWindow);
  50         fWindow = 0;
  51     }
  52 }
  53
  54 const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
  55     HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
  56
  57     if (!gWC) {
  58         WNDCLASS wc;
  59         wc.cbClsExtra = 0;
  60         wc.cbWndExtra = 0;
  61         wc.hbrBackground = NULL;
  62         wc.hCursor = LoadCursor(NULL, IDC_ARROW);
  63         wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
  64         wc.hInstance = hInstance;
  65         wc.lpfnWndProc = (WNDPROC) DefWindowProc;
  66         wc.lpszClassName = TEXT("Griffin");
  67         wc.lpszMenuName = NULL;
  68         wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
  69
  70         gWC = RegisterClass(&wc);
  71         if (!gWC) {
  72             SkDebugf("Could not register window class.\n");
  73             return NULL;
  74         }
  75     }
  76
  77     if (!(fWindow = CreateWindow(TEXT("Griffin"),
  78                                  TEXT("The Invisible Man"),
  79                                  WS_OVERLAPPEDWINDOW,
  80                                  0, 0, 1, 1,
  81                                  NULL, NULL,
  82                                  hInstance, NULL))) {
  83         SkDebugf("Could not create window.\n");
  84         return NULL;
  85     }
  86
  87     if (!(fDeviceContext = GetDC(fWindow))) {
  88         SkDebugf("Could not get device context.\n");
  89         this->destroyGLContext();
  90         return NULL;
  91     }
  92     // Requesting a Core profile would bar us from using NVPR. So we request
  93     // compatibility profile or GL ES.
  94     SkWGLContextRequest contextType =
  95         kGLES_GrGLStandard == forcedGpuAPI ?
  96         kGLES_SkWGLContextRequest : kGLPreferCompatibilityProfile_SkWGLContextRequest;
  97
  98     fPbufferContext = SkWGLPbufferContext::Create(fDeviceContext, 0, contextType);
  99
 100     HDC dc;
 101     HGLRC glrc;
 102
 103     if (NULL == fPbufferContext) {
 104         if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, contextType))) {
 105             SkDebugf("Could not create rendering context.\n");
 106             this->destroyGLContext();
 107             return NULL;
 108         }
 109         dc = fDeviceContext;
 110         glrc = fGlRenderContext;
 111     } else {
 112         ReleaseDC(fWindow, fDeviceContext);
 113         fDeviceContext = 0;
 114         DestroyWindow(fWindow);
 115         fWindow = 0;
 116
 117         dc = fPbufferContext->getDC();
 118         glrc = fPbufferContext->getGLRC();
 119     }
 120
 121     if (!(wglMakeCurrent(dc, glrc))) {
 122         SkDebugf("Could not set the context.\n");
 123         this->destroyGLContext();
 124         return NULL;
 125     }
 126
 127     const GrGLInterface* interface = GrGLCreateNativeInterface();
 128     if (NULL == interface) {
 129         SkDebugf("Could not create GL interface.\n");
 130         this->destroyGLContext();
 131         return NULL;
 132     }
 133
 134     return interface;
 135 }
 136
 137 void SkNativeGLContext::makeCurrent() const {
 138     HDC dc;
 139     HGLRC glrc;
 140
 141     if (NULL == fPbufferContext) {
 142         dc = fDeviceContext;
 143         glrc = fGlRenderContext;
 144     } else {
 145         dc = fPbufferContext->getDC();
 146         glrc = fPbufferContext->getGLRC();
 147     }
 148
 149     if (!wglMakeCurrent(dc, glrc)) {
 150         SkDebugf("Could not create rendering context.\n");
 151     }
 152 }
 153
 154 void SkNativeGLContext::swapBuffers() const {
 155     HDC dc;
 156
 157     if (NULL == fPbufferContext) {
 158         dc = fDeviceContext;
 159     } else {
 160         dc = fPbufferContext->getDC();
 161     }
 162     if (!SwapBuffers(dc)) {
 163         SkDebugf("Could not complete SwapBuffers.\n");
 164     }
 165 }