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 #include "SkWGL.h"
11
12 #define WIN32_LEAN_AND_MEAN
13 #include <windows.h>
14
AutoContextRestore()15 SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
16 fOldHGLRC = wglGetCurrentContext();
17 fOldHDC = wglGetCurrentDC();
18 }
19
~AutoContextRestore()20 SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
21 wglMakeCurrent(fOldHDC, fOldHGLRC);
22 }
23
24 ///////////////////////////////////////////////////////////////////////////////
25
26 ATOM SkNativeGLContext::gWC = 0;
27
SkNativeGLContext()28 SkNativeGLContext::SkNativeGLContext()
29 : fWindow(NULL)
30 , fDeviceContext(NULL)
31 , fGlRenderContext(0) {
32 }
33
~SkNativeGLContext()34 SkNativeGLContext::~SkNativeGLContext() {
35 this->destroyGLContext();
36 }
37
destroyGLContext()38 void SkNativeGLContext::destroyGLContext() {
39 if (fGlRenderContext) {
40 wglDeleteContext(fGlRenderContext);
41 }
42 if (fWindow && fDeviceContext) {
43 ReleaseDC(fWindow, fDeviceContext);
44 }
45 if (fWindow) {
46 DestroyWindow(fWindow);
47 }
48 }
49
createGLContext()50 const GrGLInterface* SkNativeGLContext::createGLContext() {
51 HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
52
53 if (!gWC) {
54 WNDCLASS wc;
55 wc.cbClsExtra = 0;
56 wc.cbWndExtra = 0;
57 wc.hbrBackground = NULL;
58 wc.hCursor = LoadCursor(NULL, IDC_ARROW);
59 wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
60 wc.hInstance = hInstance;
61 wc.lpfnWndProc = (WNDPROC) DefWindowProc;
62 wc.lpszClassName = TEXT("Griffin");
63 wc.lpszMenuName = NULL;
64 wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
65
66 gWC = RegisterClass(&wc);
67 if (!gWC) {
68 SkDebugf("Could not register window class.\n");
69 return NULL;
70 }
71 }
72
73 if (!(fWindow = CreateWindow(TEXT("Griffin"),
74 TEXT("The Invisible Man"),
75 WS_OVERLAPPEDWINDOW,
76 0, 0, 1, 1,
77 NULL, NULL,
78 hInstance, NULL))) {
79 SkDebugf("Could not create window.\n");
80 return NULL;
81 }
82
83 if (!(fDeviceContext = GetDC(fWindow))) {
84 SkDebugf("Could not get device context.\n");
85 this->destroyGLContext();
86 return NULL;
87 }
88
89 // Requesting a Core profile would bar us from using NVPR. So we pass false.
90 if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, false))) {
91 SkDebugf("Could not create rendering context.\n");
92 this->destroyGLContext();
93 return NULL;
94 }
95
96 if (!(wglMakeCurrent(fDeviceContext, fGlRenderContext))) {
97 SkDebugf("Could not set the context.\n");
98 this->destroyGLContext();
99 return NULL;
100 }
101 const GrGLInterface* interface = GrGLCreateNativeInterface();
102 if (NULL == interface) {
103 SkDebugf("Could not create GL interface.\n");
104 this->destroyGLContext();
105 return NULL;
106 }
107
108 return interface;
109 }
110
makeCurrent() const111 void SkNativeGLContext::makeCurrent() const {
112 if (!wglMakeCurrent(fDeviceContext, fGlRenderContext)) {
113 SkDebugf("Could not create rendering context.\n");
114 }
115 }
116
swapBuffers() const117 void SkNativeGLContext::swapBuffers() const {
118 if (!SwapBuffers(fDeviceContext)) {
119 SkDebugf("Could not complete SwapBuffers.\n");
120 }
121 }
122