const GrGLInterface* SkNativeGLContext::createGLContext() {
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 pass false.
if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, false))) {
SkDebugf("Could not create rendering context.\n");
this->destroyGLContext();
return NULL;
}
if (!(wglMakeCurrent(fDeviceContext, fGlRenderContext))) {
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;
}
bool SkOSWindow::attachGL(int msaaSampleCount, bool deepColor, AttachmentInfo* info) {
HDC dc = GetDC((HWND)fHWND);
if (NULL == fHGLRC) {
fHGLRC = SkCreateWGLContext(dc, msaaSampleCount, deepColor,
kGLPreferCompatibilityProfile_SkWGLContextRequest);
if (NULL == fHGLRC) {
return false;
}
glClearStencil(0);
glClearColor(0, 0, 0, 0);
glStencilMask(0xffffffff);
glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
}
if (wglMakeCurrent(dc, (HGLRC)fHGLRC)) {
// use DescribePixelFormat to get the stencil and color bit depth.
int pixelFormat = GetPixelFormat(dc);
PIXELFORMATDESCRIPTOR pfd;
DescribePixelFormat(dc, pixelFormat, sizeof(pfd), &pfd);
info->fStencilBits = pfd.cStencilBits;
// pfd.cColorBits includes alpha, so it will be 32 in 8/8/8/8 and 10/10/10/2
info->fColorBits = pfd.cRedBits + pfd.cGreenBits + pfd.cBlueBits;
// Get sample count if the MSAA WGL extension is present
SkWGLExtensions extensions;
if (extensions.hasExtension(dc, "WGL_ARB_multisample")) {
static const int kSampleCountAttr = SK_WGL_SAMPLES;
extensions.getPixelFormatAttribiv(dc,
pixelFormat,
0,
1,
&kSampleCountAttr,
&info->fSampleCount);
} else {
info->fSampleCount = 0;
}
glViewport(0, 0,
SkScalarRoundToInt(this->width()),
SkScalarRoundToInt(this->height()));
return true;
}
return false;
}
