michael@0: 
michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "gl/SkNativeGLContext.h"
michael@0: #include "SkWGL.h"
michael@0: 
michael@0: #define WIN32_LEAN_AND_MEAN
michael@0: #include <windows.h>
michael@0: 
michael@0: SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
michael@0:     fOldHGLRC = wglGetCurrentContext();
michael@0:     fOldHDC = wglGetCurrentDC();
michael@0: }
michael@0: 
michael@0: SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
michael@0:     wglMakeCurrent(fOldHDC, fOldHGLRC);
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: ATOM SkNativeGLContext::gWC = 0;
michael@0: 
michael@0: SkNativeGLContext::SkNativeGLContext()
michael@0:     : fWindow(NULL)
michael@0:     , fDeviceContext(NULL)
michael@0:     , fGlRenderContext(0) {
michael@0: }
michael@0: 
michael@0: SkNativeGLContext::~SkNativeGLContext() {
michael@0:     this->destroyGLContext();
michael@0: }
michael@0: 
michael@0: void SkNativeGLContext::destroyGLContext() {
michael@0:     if (fGlRenderContext) {
michael@0:         wglDeleteContext(fGlRenderContext);
michael@0:     }
michael@0:     if (fWindow && fDeviceContext) {
michael@0:         ReleaseDC(fWindow, fDeviceContext);
michael@0:     }
michael@0:     if (fWindow) {
michael@0:         DestroyWindow(fWindow);
michael@0:     }
michael@0: }
michael@0: 
michael@0: const GrGLInterface* SkNativeGLContext::createGLContext() {
michael@0:     HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
michael@0: 
michael@0:     if (!gWC) {
michael@0:         WNDCLASS wc;
michael@0:         wc.cbClsExtra = 0;
michael@0:         wc.cbWndExtra = 0;
michael@0:         wc.hbrBackground = NULL;
michael@0:         wc.hCursor = LoadCursor(NULL, IDC_ARROW);
michael@0:         wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
michael@0:         wc.hInstance = hInstance;
michael@0:         wc.lpfnWndProc = (WNDPROC) DefWindowProc;
michael@0:         wc.lpszClassName = TEXT("Griffin");
michael@0:         wc.lpszMenuName = NULL;
michael@0:         wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
michael@0: 
michael@0:         gWC = RegisterClass(&wc);
michael@0:         if (!gWC) {
michael@0:             SkDebugf("Could not register window class.\n");
michael@0:             return NULL;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     if (!(fWindow = CreateWindow(TEXT("Griffin"),
michael@0:                                  TEXT("The Invisible Man"),
michael@0:                                  WS_OVERLAPPEDWINDOW,
michael@0:                                  0, 0, 1, 1,
michael@0:                                  NULL, NULL,
michael@0:                                  hInstance, NULL))) {
michael@0:         SkDebugf("Could not create window.\n");
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     if (!(fDeviceContext = GetDC(fWindow))) {
michael@0:         SkDebugf("Could not get device context.\n");
michael@0:         this->destroyGLContext();
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     // Requesting a Core profile would bar us from using NVPR. So we pass false.
michael@0:     if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, false))) {
michael@0:         SkDebugf("Could not create rendering context.\n");
michael@0:         this->destroyGLContext();
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     if (!(wglMakeCurrent(fDeviceContext, fGlRenderContext))) {
michael@0:         SkDebugf("Could not set the context.\n");
michael@0:         this->destroyGLContext();
michael@0:         return NULL;
michael@0:     }
michael@0:     const GrGLInterface* interface = GrGLCreateNativeInterface();
michael@0:     if (NULL == interface) {
michael@0:         SkDebugf("Could not create GL interface.\n");
michael@0:         this->destroyGLContext();
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     return interface;
michael@0: }
michael@0: 
michael@0: void SkNativeGLContext::makeCurrent() const {
michael@0:     if (!wglMakeCurrent(fDeviceContext, fGlRenderContext)) {
michael@0:         SkDebugf("Could not create rendering context.\n");
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkNativeGLContext::swapBuffers() const {
michael@0:     if (!SwapBuffers(fDeviceContext)) {
michael@0:         SkDebugf("Could not complete SwapBuffers.\n");
michael@0:     }
michael@0: }