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| 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 #include "gl/SkNativeGLContext.h" |
| 9 |
| 10 SkNativeGLContext::AutoContextRestore::AutoContextRestore() { |
| 11 fOldEGLContext = eglGetCurrentContext(); |
| 12 fOldDisplay = eglGetCurrentDisplay(); |
| 13 fOldSurface = eglGetCurrentSurface(EGL_DRAW); |
| 14 |
| 15 } |
| 16 |
| 17 SkNativeGLContext::AutoContextRestore::~AutoContextRestore() { |
| 18 if (fOldDisplay) { |
| 19 eglMakeCurrent(fOldDisplay, fOldSurface, fOldSurface, fOldEGLContext); |
| 20 } |
| 21 } |
| 22 |
| 23 /////////////////////////////////////////////////////////////////////////////// |
| 24 |
| 25 SkNativeGLContext::SkNativeGLContext() |
| 26 : fContext(EGL_NO_CONTEXT) |
| 27 , fDisplay(EGL_NO_DISPLAY) |
| 28 , fSurface(EGL_NO_SURFACE) { |
| 29 } |
| 30 |
| 31 SkNativeGLContext::~SkNativeGLContext() { |
| 32 this->destroyGLContext(); |
| 33 } |
| 34 |
| 35 void SkNativeGLContext::destroyGLContext() { |
| 36 if (fDisplay) { |
| 37 eglMakeCurrent(fDisplay, 0, 0, 0); |
| 38 |
| 39 if (fContext) { |
| 40 eglDestroyContext(fDisplay, fContext); |
| 41 fContext = EGL_NO_CONTEXT; |
| 42 } |
| 43 |
| 44 if (fSurface) { |
| 45 eglDestroySurface(fDisplay, fSurface); |
| 46 fSurface = EGL_NO_SURFACE; |
| 47 } |
| 48 |
| 49 //TODO should we close the display? |
| 50 fDisplay = EGL_NO_DISPLAY; |
| 51 } |
| 52 } |
| 53 |
| 54 const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAP
I) { |
| 55 static const EGLint kEGLContextAttribsForOpenGL[] = { |
| 56 EGL_NONE |
| 57 }; |
| 58 |
| 59 static const EGLint kEGLContextAttribsForOpenGLES[] = { |
| 60 EGL_CONTEXT_CLIENT_VERSION, 2, |
| 61 EGL_NONE |
| 62 }; |
| 63 |
| 64 static const struct { |
| 65 const EGLint* fContextAttribs; |
| 66 EGLenum fAPI; |
| 67 EGLint fRenderableTypeBit; |
| 68 GrGLStandard fStandard; |
| 69 } kAPIs[] = { |
| 70 { // OpenGL |
| 71 kEGLContextAttribsForOpenGL, |
| 72 EGL_OPENGL_API, |
| 73 EGL_OPENGL_BIT, |
| 74 kGL_GrGLStandard |
| 75 }, |
| 76 { // OpenGL ES. This seems to work for both ES2 and 3 (when available)
. |
| 77 kEGLContextAttribsForOpenGLES, |
| 78 EGL_OPENGL_ES_API, |
| 79 EGL_OPENGL_ES2_BIT, |
| 80 kGLES_GrGLStandard |
| 81 }, |
| 82 }; |
| 83 |
| 84 size_t apiLimit = SK_ARRAY_COUNT(kAPIs); |
| 85 size_t api = 0; |
| 86 if (forcedGpuAPI == kGL_GrGLStandard) { |
| 87 apiLimit = 1; |
| 88 } else if (forcedGpuAPI == kGLES_GrGLStandard) { |
| 89 api = 1; |
| 90 } |
| 91 SkASSERT(forcedGpuAPI == kNone_GrGLStandard || kAPIs[api].fStandard == force
dGpuAPI); |
| 92 |
| 93 const GrGLInterface* interface = NULL; |
| 94 |
| 95 for (; NULL == interface && api < apiLimit; ++api) { |
| 96 fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY); |
| 97 |
| 98 EGLint majorVersion; |
| 99 EGLint minorVersion; |
| 100 eglInitialize(fDisplay, &majorVersion, &minorVersion); |
| 101 |
| 102 #if 0 |
| 103 SkDebugf("VENDOR: %s\n", eglQueryString(fDisplay, EGL_VENDOR)); |
| 104 SkDebugf("APIS: %s\n", eglQueryString(fDisplay, EGL_CLIENT_APIS)); |
| 105 SkDebugf("VERSION: %s\n", eglQueryString(fDisplay, EGL_VERSION)); |
| 106 SkDebugf("EXTENSIONS %s\n", eglQueryString(fDisplay, EGL_EXTENSIONS)); |
| 107 #endif |
| 108 |
| 109 if (!eglBindAPI(kAPIs[api].fAPI)) { |
| 110 continue; |
| 111 } |
| 112 |
| 113 EGLint numConfigs; |
| 114 const EGLint configAttribs[] = { |
| 115 EGL_SURFACE_TYPE, EGL_PBUFFER_BIT, |
| 116 EGL_RENDERABLE_TYPE, kAPIs[api].fRenderableTypeBit, |
| 117 EGL_RED_SIZE, 8, |
| 118 EGL_GREEN_SIZE, 8, |
| 119 EGL_BLUE_SIZE, 8, |
| 120 EGL_ALPHA_SIZE, 8, |
| 121 EGL_NONE |
| 122 }; |
| 123 |
| 124 EGLConfig surfaceConfig; |
| 125 if (!eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numCon
figs)) { |
| 126 SkDebugf("eglChooseConfig failed. EGL Error: 0x%08x\n", eglGetError(
)); |
| 127 continue; |
| 128 } |
| 129 |
| 130 fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, kAPIs[api].fC
ontextAttribs); |
| 131 if (EGL_NO_CONTEXT == fContext) { |
| 132 SkDebugf("eglCreateContext failed. EGL Error: 0x%08x\n", eglGetErro
r()); |
| 133 continue; |
| 134 } |
| 135 |
| 136 static const EGLint kSurfaceAttribs[] = { |
| 137 EGL_WIDTH, 1, |
| 138 EGL_HEIGHT, 1, |
| 139 EGL_NONE |
| 140 }; |
| 141 |
| 142 fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, kSurfaceAttr
ibs); |
| 143 if (EGL_NO_SURFACE == fSurface) { |
| 144 SkDebugf("eglCreatePbufferSurface failed. EGL Error: 0x%08x\n", eglG
etError()); |
| 145 this->destroyGLContext(); |
| 146 continue; |
| 147 } |
| 148 |
| 149 if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) { |
| 150 SkDebugf("eglMakeCurrent failed. EGL Error: 0x%08x\n", eglGetError(
)); |
| 151 this->destroyGLContext(); |
| 152 continue; |
| 153 } |
| 154 |
| 155 interface = GrGLCreateNativeInterface(); |
| 156 if (NULL == interface) { |
| 157 SkDebugf("Failed to create gl interface.\n"); |
| 158 this->destroyGLContext(); |
| 159 continue; |
| 160 } |
| 161 |
| 162 if (!interface->validate()) { |
| 163 interface->unref(); |
| 164 interface = NULL; |
| 165 this->destroyGLContext(); |
| 166 } |
| 167 } |
| 168 |
| 169 return interface; |
| 170 } |
| 171 |
| 172 void SkNativeGLContext::makeCurrent() const { |
| 173 if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) { |
| 174 SkDebugf("Could not set the context.\n"); |
| 175 } |
| 176 } |
| 177 |
| 178 void SkNativeGLContext::swapBuffers() const { |
| 179 if (!eglSwapBuffers(fDisplay, fSurface)) { |
| 180 SkDebugf("Could not complete eglSwapBuffers.\n"); |
| 181 } |
| 182 } |
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