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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/SkGLContext.h"
#include <windows.h>
#include <GL/GL.h>
#include "win/SkWGL.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
namespace {
class WinGLContext : public SkGLContext {
public:
WinGLContext(GrGLStandard forcedGpuAPI);
~WinGLContext() SK_OVERRIDE;
void makeCurrent() const SK_OVERRIDE;
void swapBuffers() const SK_OVERRIDE;
private:
void destroyGLContext();
HWND fWindow;
HDC fDeviceContext;
HGLRC fGlRenderContext;
static ATOM gWC;
SkWGLPbufferContext* fPbufferContext;
};
ATOM WinGLContext::gWC = 0;
WinGLContext::WinGLContext(GrGLStandard forcedGpuAPI)
: fWindow(NULL)
, fDeviceContext(NULL)
, fGlRenderContext(0)
, fPbufferContext(NULL) {
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;
}
}
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;
}
if (!(fDeviceContext = GetDC(fWindow))) {
SkDebugf("Could not get device context.\n");
this->destroyGLContext();
return;
}
// 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;
}
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;
}
fGL.reset(GrGLCreateNativeInterface());
if (NULL == fGL.get()) {
SkDebugf("Could not create GL interface.\n");
this->destroyGLContext();
return;
}
if (!fGL->validate()) {
SkDebugf("Could not validate GL interface.\n");
this->destroyGLContext();
return;
}
}
WinGLContext::~WinGLContext() {
this->destroyGLContext();
}
void WinGLContext::destroyGLContext() {
fGL.reset(NULL);
SkSafeSetNull(fPbufferContext);
if (fGlRenderContext) {
wglDeleteContext(fGlRenderContext);
fGlRenderContext = 0;
}
if (fWindow && fDeviceContext) {
ReleaseDC(fWindow, fDeviceContext);
fDeviceContext = 0;
}
if (fWindow) {
DestroyWindow(fWindow);
fWindow = 0;
}
}
void WinGLContext::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 WinGLContext::swapBuffers() const {
HDC dc;
if (NULL == fPbufferContext) {
dc = fDeviceContext;
} else {
dc = fPbufferContext->getDC();
}
if (!SwapBuffers(dc)) {
SkDebugf("Could not complete SwapBuffers.\n");
}
}
} // anonymous namespace
SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI) {
WinGLContext* ctx = SkNEW_ARGS(WinGLContext, (forcedGpuAPI));
if (!ctx->isValid()) {
SkDELETE(ctx);
return NULL;
}
return ctx;
}
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