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/*
* 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) {
}
SkNativeGLContext::~SkNativeGLContext() {
this->destroyGLContext();
}
void SkNativeGLContext::destroyGLContext() {
if (fGlRenderContext) {
wglDeleteContext(fGlRenderContext);
}
if (fWindow && fDeviceContext) {
ReleaseDC(fWindow, fDeviceContext);
}
if (fWindow) {
DestroyWindow(fWindow);
}
}
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;
}
PIXELFORMATDESCRIPTOR pfd;
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_SUPPORT_OPENGL;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
pfd.cDepthBits = 0;
pfd.cStencilBits = 0;
pfd.iLayerType = PFD_MAIN_PLANE;
int pixelFormat = 0;
if (!(pixelFormat = ChoosePixelFormat(fDeviceContext, &pfd))) {
SkDebugf("No matching pixel format descriptor.\n");
this->destroyGLContext();
return NULL;
}
if (!SetPixelFormat(fDeviceContext, pixelFormat, &pfd)) {
SkDebugf("Could not set the pixel format %d.\n", pixelFormat);
this->destroyGLContext();
return NULL;
}
if (!(fGlRenderContext = wglCreateContext(fDeviceContext))) {
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;
}
void SkNativeGLContext::makeCurrent() const {
if (!wglMakeCurrent(fDeviceContext, fGlRenderContext)) {
SkDebugf("Could not create rendering context.\n");
}
}
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