1
2 /*
3 * Copyright 2012 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/SkANGLEGLContext.h"
10
AutoContextRestore()11 SkANGLEGLContext::AutoContextRestore::AutoContextRestore() {
12 fOldEGLContext = eglGetCurrentContext();
13 fOldDisplay = eglGetCurrentDisplay();
14 fOldSurface = eglGetCurrentSurface(EGL_DRAW);
15
16 }
17
~AutoContextRestore()18 SkANGLEGLContext::AutoContextRestore::~AutoContextRestore() {
19 if (NULL != fOldDisplay) {
20 eglMakeCurrent(fOldDisplay, fOldSurface, fOldSurface, fOldEGLContext);
21 }
22 }
23
24 ///////////////////////////////////////////////////////////////////////////////
25
SkANGLEGLContext()26 SkANGLEGLContext::SkANGLEGLContext()
27 : fContext(EGL_NO_CONTEXT)
28 , fDisplay(EGL_NO_DISPLAY)
29 , fSurface(EGL_NO_SURFACE) {
30 }
31
~SkANGLEGLContext()32 SkANGLEGLContext::~SkANGLEGLContext() {
33 this->destroyGLContext();
34 }
35
destroyGLContext()36 void SkANGLEGLContext::destroyGLContext() {
37 if (fDisplay) {
38 eglMakeCurrent(fDisplay, 0, 0, 0);
39
40 if (fContext) {
41 eglDestroyContext(fDisplay, fContext);
42 fContext = EGL_NO_CONTEXT;
43 }
44
45 if (fSurface) {
46 eglDestroySurface(fDisplay, fSurface);
47 fSurface = EGL_NO_SURFACE;
48 }
49
50 //TODO should we close the display?
51 fDisplay = EGL_NO_DISPLAY;
52 }
53 }
54
createGLContext()55 const GrGLInterface* SkANGLEGLContext::createGLContext() {
56
57 fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
58
59 EGLint majorVersion;
60 EGLint minorVersion;
61 eglInitialize(fDisplay, &majorVersion, &minorVersion);
62
63 EGLint numConfigs;
64 static const EGLint configAttribs[] = {
65 EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
66 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
67 EGL_RED_SIZE, 8,
68 EGL_GREEN_SIZE, 8,
69 EGL_BLUE_SIZE, 8,
70 EGL_ALPHA_SIZE, 8,
71 EGL_NONE
72 };
73
74 EGLConfig surfaceConfig;
75 eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs);
76
77 static const EGLint contextAttribs[] = {
78 EGL_CONTEXT_CLIENT_VERSION, 2,
79 EGL_NONE
80 };
81 fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, contextAttribs);
82
83
84 static const EGLint surfaceAttribs[] = {
85 EGL_WIDTH, 1,
86 EGL_HEIGHT, 1,
87 EGL_NONE
88 };
89 fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, surfaceAttribs);
90
91 eglMakeCurrent(fDisplay, fSurface, fSurface, fContext);
92
93 const GrGLInterface* interface = GrGLCreateANGLEInterface();
94 if (NULL == interface) {
95 SkDebugf("Could not create ANGLE GL interface!\n");
96 this->destroyGLContext();
97 return NULL;
98 }
99
100 return interface;
101 }
102
makeCurrent() const103 void SkANGLEGLContext::makeCurrent() const {
104 if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
105 SkDebugf("Could not set the context.\n");
106 }
107 }
108
swapBuffers() const109 void SkANGLEGLContext::swapBuffers() const {
110 if (!eglSwapBuffers(fDisplay, fSurface)) {
111 SkDebugf("Could not complete eglSwapBuffers.\n");
112 }
113 }
114