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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 #include <GL/glu.h> | |
| 11 | |
| 12 /* Note: Skia requires glx 1.3 or newer */ | |
| 13 | |
| 14 SkNativeGLContext::AutoContextRestore::AutoContextRestore() { | |
| 15 fOldGLXContext = glXGetCurrentContext(); | |
| 16 fOldDisplay = glXGetCurrentDisplay(); | |
| 17 fOldDrawable = glXGetCurrentDrawable(); | |
| 18 } | |
| 19 | |
| 20 SkNativeGLContext::AutoContextRestore::~AutoContextRestore() { | |
| 21 if (fOldDisplay) { | |
| 22 glXMakeCurrent(fOldDisplay, fOldDrawable, fOldGLXContext); | |
| 23 } | |
| 24 } | |
| 25 | |
| 26 /////////////////////////////////////////////////////////////////////////////// | |
| 27 | |
| 28 static bool ctxErrorOccurred = false; | |
| 29 static int ctxErrorHandler(Display *dpy, XErrorEvent *ev) { | |
| 30 ctxErrorOccurred = true; | |
| 31 return 0; | |
| 32 } | |
| 33 | |
| 34 SkNativeGLContext::SkNativeGLContext() | |
| 35 : fContext(NULL) | |
| 36 , fDisplay(NULL) | |
| 37 , fPixmap(0) | |
| 38 , fGlxPixmap(0) { | |
| 39 } | |
| 40 | |
| 41 SkNativeGLContext::~SkNativeGLContext() { | |
| 42 this->destroyGLContext(); | |
| 43 } | |
| 44 | |
| 45 void SkNativeGLContext::destroyGLContext() { | |
| 46 if (fDisplay) { | |
| 47 glXMakeCurrent(fDisplay, 0, 0); | |
| 48 | |
| 49 if (fContext) { | |
| 50 glXDestroyContext(fDisplay, fContext); | |
| 51 fContext = NULL; | |
| 52 } | |
| 53 | |
| 54 if (fGlxPixmap) { | |
| 55 glXDestroyGLXPixmap(fDisplay, fGlxPixmap); | |
| 56 fGlxPixmap = 0; | |
| 57 } | |
| 58 | |
| 59 if (fPixmap) { | |
| 60 XFreePixmap(fDisplay, fPixmap); | |
| 61 fPixmap = 0; | |
| 62 } | |
| 63 | |
| 64 XCloseDisplay(fDisplay); | |
| 65 fDisplay = NULL; | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAP
I) { | |
| 70 fDisplay = XOpenDisplay(0); | |
| 71 | |
| 72 if (!fDisplay) { | |
| 73 SkDebugf("Failed to open X display.\n"); | |
| 74 this->destroyGLContext(); | |
| 75 return NULL; | |
| 76 } | |
| 77 | |
| 78 // Get a matching FB config | |
| 79 static int visual_attribs[] = { | |
| 80 GLX_X_RENDERABLE , True, | |
| 81 GLX_DRAWABLE_TYPE , GLX_PIXMAP_BIT, | |
| 82 None | |
| 83 }; | |
| 84 | |
| 85 int glx_major, glx_minor; | |
| 86 | |
| 87 // FBConfigs were added in GLX version 1.3. | |
| 88 if (!glXQueryVersion(fDisplay, &glx_major, &glx_minor) || | |
| 89 ((glx_major == 1) && (glx_minor < 3)) || (glx_major < 1)) { | |
| 90 SkDebugf("GLX version 1.3 or higher required.\n"); | |
| 91 this->destroyGLContext(); | |
| 92 return NULL; | |
| 93 } | |
| 94 | |
| 95 //SkDebugf("Getting matching framebuffer configs.\n"); | |
| 96 int fbcount; | |
| 97 GLXFBConfig *fbc = glXChooseFBConfig(fDisplay, DefaultScreen(fDisplay), | |
| 98 visual_attribs, &fbcount); | |
| 99 if (!fbc) { | |
| 100 SkDebugf("Failed to retrieve a framebuffer config.\n"); | |
| 101 this->destroyGLContext(); | |
| 102 return NULL; | |
| 103 } | |
| 104 //SkDebugf("Found %d matching FB configs.\n", fbcount); | |
| 105 | |
| 106 // Pick the FB config/visual with the most samples per pixel | |
| 107 //SkDebugf("Getting XVisualInfos.\n"); | |
| 108 int best_fbc = -1, best_num_samp = -1; | |
| 109 | |
| 110 int i; | |
| 111 for (i = 0; i < fbcount; ++i) { | |
| 112 XVisualInfo *vi = glXGetVisualFromFBConfig(fDisplay, fbc[i]); | |
| 113 if (vi) { | |
| 114 int samp_buf, samples; | |
| 115 glXGetFBConfigAttrib(fDisplay, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf
); | |
| 116 glXGetFBConfigAttrib(fDisplay, fbc[i], GLX_SAMPLES, &samples); | |
| 117 | |
| 118 //SkDebugf(" Matching fbconfig %d, visual ID 0x%2x: SAMPLE_BUFFERS
= %d," | |
| 119 // " SAMPLES = %d\n", | |
| 120 // i, (unsigned int)vi->visualid, samp_buf, samples); | |
| 121 | |
| 122 if (best_fbc < 0 || (samp_buf && samples > best_num_samp)) | |
| 123 best_fbc = i, best_num_samp = samples; | |
| 124 } | |
| 125 XFree(vi); | |
| 126 } | |
| 127 | |
| 128 GLXFBConfig bestFbc = fbc[best_fbc]; | |
| 129 | |
| 130 // Be sure to free the FBConfig list allocated by glXChooseFBConfig() | |
| 131 XFree(fbc); | |
| 132 | |
| 133 // Get a visual | |
| 134 XVisualInfo *vi = glXGetVisualFromFBConfig(fDisplay, bestFbc); | |
| 135 //SkDebugf("Chosen visual ID = 0x%x\n", (unsigned int)vi->visualid); | |
| 136 | |
| 137 fPixmap = XCreatePixmap(fDisplay, RootWindow(fDisplay, vi->screen), 10, 10,
vi->depth); | |
| 138 | |
| 139 if (!fPixmap) { | |
| 140 SkDebugf("Failed to create pixmap.\n"); | |
| 141 this->destroyGLContext(); | |
| 142 return NULL; | |
| 143 } | |
| 144 | |
| 145 fGlxPixmap = glXCreateGLXPixmap(fDisplay, vi, fPixmap); | |
| 146 | |
| 147 // Done with the visual info data | |
| 148 XFree(vi); | |
| 149 | |
| 150 // Create the context | |
| 151 | |
| 152 // Install an X error handler so the application won't exit if GL 3.0 | |
| 153 // context allocation fails. | |
| 154 // | |
| 155 // Note this error handler is global. | |
| 156 // All display connections in all threads of a process use the same | |
| 157 // error handler, so be sure to guard against other threads issuing | |
| 158 // X commands while this code is running. | |
| 159 ctxErrorOccurred = false; | |
| 160 int (*oldHandler)(Display*, XErrorEvent*) = | |
| 161 XSetErrorHandler(&ctxErrorHandler); | |
| 162 | |
| 163 // Get the default screen's GLX extension list | |
| 164 const char *glxExts = glXQueryExtensionsString( | |
| 165 fDisplay, DefaultScreen(fDisplay) | |
| 166 ); | |
| 167 | |
| 168 | |
| 169 // Check for the GLX_ARB_create_context extension string and the function. | |
| 170 // If either is not present, use GLX 1.3 context creation method. | |
| 171 if (!gluCheckExtension(reinterpret_cast<const GLubyte*>("GLX_ARB_create_cont
ext"), | |
| 172 reinterpret_cast<const GLubyte*>(glxExts))) { | |
| 173 if (kGLES_GrGLStandard != forcedGpuAPI) { | |
| 174 fContext = glXCreateNewContext(fDisplay, bestFbc, GLX_RGBA_TYPE, 0,
True); | |
| 175 } | |
| 176 } else { | |
| 177 //SkDebugf("Creating context.\n"); | |
| 178 PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB = | |
| 179 (PFNGLXCREATECONTEXTATTRIBSARBPROC) glXGetProcAddressARB((GrGLubyte*
)"glXCreateContextAttribsARB"); | |
| 180 | |
| 181 if (kGLES_GrGLStandard == forcedGpuAPI) { | |
| 182 if (gluCheckExtension( | |
| 183 reinterpret_cast<const GLubyte*>("GLX_EXT_create_context_es2
_profile"), | |
| 184 reinterpret_cast<const GLubyte*>(glxExts))) { | |
| 185 static const int context_attribs_gles[] = { | |
| 186 GLX_CONTEXT_MAJOR_VERSION_ARB, 3, | |
| 187 GLX_CONTEXT_MINOR_VERSION_ARB, 0, | |
| 188 GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_ES2_PROFILE_BIT_EX
T, | |
| 189 None | |
| 190 }; | |
| 191 fContext = glXCreateContextAttribsARB(fDisplay, bestFbc, 0, True
, | |
| 192 context_attribs_gles); | |
| 193 } | |
| 194 } else { | |
| 195 // Well, unfortunately GLX will not just give us the highest context
so instead we have | |
| 196 // to do this nastiness | |
| 197 for (i = NUM_GL_VERSIONS - 2; i > 0 ; i--) { | |
| 198 /* don't bother below GL 3.0 */ | |
| 199 if (gl_versions[i].major == 3 && gl_versions[i].minor == 0) { | |
| 200 break; | |
| 201 } | |
| 202 // On Nvidia GPUs, to use Nv Path rendering we need a compatibil
ity profile for the | |
| 203 // time being. | |
| 204 // TODO when Nvidia implements NVPR on Core profiles, we should
start requesting | |
| 205 // core here | |
| 206 static const int context_attribs_gl[] = { | |
| 207 GLX_CONTEXT_MAJOR_VERSION_ARB, gl_versions[i].major, | |
| 208 GLX_CONTEXT_MINOR_VERSION_ARB, gl_versions[i].minor, | |
| 209 GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_COMPATIBILITY_PR
OFILE_BIT_ARB, | |
| 210 None | |
| 211 }; | |
| 212 fContext = | |
| 213 glXCreateContextAttribsARB(fDisplay, bestFbc, 0, True, c
ontext_attribs_gl); | |
| 214 | |
| 215 // Sync to ensure any errors generated are processed. | |
| 216 XSync(fDisplay, False); | |
| 217 | |
| 218 if (!ctxErrorOccurred && fContext) { | |
| 219 break; | |
| 220 } | |
| 221 // try again | |
| 222 ctxErrorOccurred = false; | |
| 223 } | |
| 224 | |
| 225 // Couldn't create GL 3.0 context. | |
| 226 // Fall back to old-style 2.x context. | |
| 227 // When a context version below 3.0 is requested, | |
| 228 // implementations will return the newest context version | |
| 229 // compatible with OpenGL versions less than version 3.0. | |
| 230 if (ctxErrorOccurred || !fContext) { | |
| 231 static const int context_attribs_gl_fallback[] = { | |
| 232 GLX_CONTEXT_MAJOR_VERSION_ARB, 1, | |
| 233 GLX_CONTEXT_MINOR_VERSION_ARB, 0, | |
| 234 None | |
| 235 }; | |
| 236 | |
| 237 ctxErrorOccurred = false; | |
| 238 | |
| 239 fContext = glXCreateContextAttribsARB(fDisplay, bestFbc, 0, True
, | |
| 240 context_attribs_gl_fallbac
k); | |
| 241 } | |
| 242 } | |
| 243 } | |
| 244 | |
| 245 // Sync to ensure any errors generated are processed. | |
| 246 XSync(fDisplay, False); | |
| 247 | |
| 248 // Restore the original error handler | |
| 249 XSetErrorHandler(oldHandler); | |
| 250 | |
| 251 if (ctxErrorOccurred || !fContext) { | |
| 252 SkDebugf("Failed to create an OpenGL context.\n"); | |
| 253 this->destroyGLContext(); | |
| 254 return NULL; | |
| 255 } | |
| 256 | |
| 257 // Verify that context is a direct context | |
| 258 if (!glXIsDirect(fDisplay, fContext)) { | |
| 259 //SkDebugf("Indirect GLX rendering context obtained.\n"); | |
| 260 } else { | |
| 261 //SkDebugf("Direct GLX rendering context obtained.\n"); | |
| 262 } | |
| 263 | |
| 264 //SkDebugf("Making context current.\n"); | |
| 265 if (!glXMakeCurrent(fDisplay, fGlxPixmap, fContext)) { | |
| 266 SkDebugf("Could not set the context.\n"); | |
| 267 this->destroyGLContext(); | |
| 268 return NULL; | |
| 269 } | |
| 270 | |
| 271 const GrGLInterface* interface = GrGLCreateNativeInterface(); | |
| 272 if (!interface) { | |
| 273 SkDebugf("Failed to create gl interface"); | |
| 274 this->destroyGLContext(); | |
| 275 return NULL; | |
| 276 } | |
| 277 return interface; | |
| 278 } | |
| 279 | |
| 280 void SkNativeGLContext::makeCurrent() const { | |
| 281 if (!glXMakeCurrent(fDisplay, fGlxPixmap, fContext)) { | |
| 282 SkDebugf("Could not set the context.\n"); | |
| 283 } | |
| 284 } | |
| 285 | |
| 286 void SkNativeGLContext::swapBuffers() const { | |
| 287 glXSwapBuffers(fDisplay, fGlxPixmap); | |
| 288 } | |
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Chromium Code Reviews
Issue 630843002:
Make the Sk GL context class an abstract base class (Closed)
Base URL: https://skia.googlesource.com/skia.git@master