bool
WGLLibrary::EnsureInitialized(bool aUseMesaLlvmPipe)
{
if (mInitialized)
return true;
mozilla::ScopedGfxFeatureReporter reporter("WGL", aUseMesaLlvmPipe);
const char* libGLFilename = aUseMesaLlvmPipe
? "mesallvmpipe.dll"
: "Opengl32.dll";
if (!mOGLLibrary) {
mOGLLibrary = PR_LoadLibrary(libGLFilename);
if (!mOGLLibrary) {
NS_WARNING("Couldn't load OpenGL library.");
return false;
}
}
mUseDoubleBufferedWindows = PR_GetEnv("MOZ_WGL_DB") != nullptr;
GLLibraryLoader::SymLoadStruct earlySymbols[] = {
{ (PRFuncPtr*) &fCreateContext, { "wglCreateContext", NULL } },
{ (PRFuncPtr*) &fMakeCurrent, { "wglMakeCurrent", NULL } },
{ (PRFuncPtr*) &fGetProcAddress, { "wglGetProcAddress", NULL } },
{ (PRFuncPtr*) &fDeleteContext, { "wglDeleteContext", NULL } },
{ (PRFuncPtr*) &fGetCurrentContext, { "wglGetCurrentContext", NULL } },
{ (PRFuncPtr*) &fGetCurrentDC, { "wglGetCurrentDC", NULL } },
{ (PRFuncPtr*) &fShareLists, { "wglShareLists", NULL } },
{ NULL, { NULL } }
};
if (!GLLibraryLoader::LoadSymbols(mOGLLibrary, &earlySymbols[0])) {
NS_WARNING("Couldn't find required entry points in OpenGL DLL (early init)");
return false;
}
// This is ridiculous -- we have to actually create a context to
// get the OpenGL ICD to load.
mWindow = CreateDummyWindow(&mWindowDC);
NS_ENSURE_TRUE(mWindow, false);
// create rendering context
mWindowGLContext = fCreateContext(mWindowDC);
NS_ENSURE_TRUE(mWindowGLContext, false);
HGLRC curCtx = fGetCurrentContext();
HDC curDC = fGetCurrentDC();
if (!fMakeCurrent((HDC)mWindowDC, (HGLRC)mWindowGLContext)) {
NS_WARNING("wglMakeCurrent failed");
return false;
}
// Now we can grab all the other symbols that we couldn't without having
// a context current.
GLLibraryLoader::SymLoadStruct pbufferSymbols[] = {
{ (PRFuncPtr*) &fCreatePbuffer, { "wglCreatePbufferARB", "wglCreatePbufferEXT", NULL } },
{ (PRFuncPtr*) &fDestroyPbuffer, { "wglDestroyPbufferARB", "wglDestroyPbufferEXT", NULL } },
{ (PRFuncPtr*) &fGetPbufferDC, { "wglGetPbufferDCARB", "wglGetPbufferDCEXT", NULL } },
{ (PRFuncPtr*) &fBindTexImage, { "wglBindTexImageARB", "wglBindTexImageEXT", NULL } },
{ (PRFuncPtr*) &fReleaseTexImage, { "wglReleaseTexImageARB", "wglReleaseTexImageEXT", NULL } },
{ NULL, { NULL } }
};
GLLibraryLoader::SymLoadStruct pixFmtSymbols[] = {
{ (PRFuncPtr*) &fChoosePixelFormat, { "wglChoosePixelFormatARB", "wglChoosePixelFormatEXT", NULL } },
{ (PRFuncPtr*) &fGetPixelFormatAttribiv, { "wglGetPixelFormatAttribivARB", "wglGetPixelFormatAttribivEXT", NULL } },
{ NULL, { NULL } }
};
if (!GLLibraryLoader::LoadSymbols(mOGLLibrary, &pbufferSymbols[0],
(GLLibraryLoader::PlatformLookupFunction)fGetProcAddress))
{
// this isn't an error, just means that pbuffers aren't supported
fCreatePbuffer = nullptr;
}
if (!GLLibraryLoader::LoadSymbols(mOGLLibrary, &pixFmtSymbols[0],
(GLLibraryLoader::PlatformLookupFunction)fGetProcAddress))
{
// this isn't an error, just means that we don't have the pixel format extension
fChoosePixelFormat = nullptr;
}
GLLibraryLoader::SymLoadStruct extensionsSymbols[] = {
{ (PRFuncPtr *) &fGetExtensionsString, { "wglGetExtensionsStringARB", NULL} },
{ NULL, { NULL } }
};
GLLibraryLoader::SymLoadStruct robustnessSymbols[] = {
{ (PRFuncPtr *) &fCreateContextAttribs, { "wglCreateContextAttribsARB", NULL} },
{ NULL, { NULL } }
};
if (GLLibraryLoader::LoadSymbols(mOGLLibrary, &extensionsSymbols[0],
(GLLibraryLoader::PlatformLookupFunction)fGetProcAddress)) {
const char *wglExts = fGetExtensionsString(mWindowDC);
if (wglExts && HasExtension(wglExts, "WGL_ARB_create_context")) {
GLLibraryLoader::LoadSymbols(mOGLLibrary, &robustnessSymbols[0],
(GLLibraryLoader::PlatformLookupFunction)fGetProcAddress);
if (HasExtension(wglExts, "WGL_ARB_create_context_robustness")) {
mHasRobustness = true;
}
}
}
// reset back to the previous context, just in case
fMakeCurrent(curDC, curCtx);
if (mHasRobustness) {
fDeleteContext(mWindowGLContext);
int attribs[] = {
LOCAL_WGL_CONTEXT_FLAGS_ARB, LOCAL_WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB,
LOCAL_WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB, LOCAL_WGL_LOSE_CONTEXT_ON_RESET_ARB,
0
};
mWindowGLContext = fCreateContextAttribs(mWindowDC, NULL, attribs);
if (!mWindowGLContext) {
mHasRobustness = false;
mWindowGLContext = fCreateContext(mWindowDC);
}
}
mInitialized = true;
GLContext::ContextFlags flag = GLContext::ContextFlagsNone;
if (aUseMesaLlvmPipe) {
mLibType = WGLLibrary::MESA_LLVMPIPE_LIB;
flag = GLContext::ContextFlagsMesaLLVMPipe;
}
// Call this to create the global GLContext instance,
// and to check for errors. Note that this must happen /after/
// setting mInitialized to TRUE, or an infinite loop results.
if (GLContextProviderWGL::GetGlobalContext(flag) == nullptr) {
mInitialized = false;
return false;
}
reporter.SetSuccessful();
return true;
}
const char* SkWGLExtensions::getExtensionsString(HDC hdc) const {
return fGetExtensionsString(hdc);
}