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;
}
Ejemplo n.º 2
0
const char* SkWGLExtensions::getExtensionsString(HDC hdc) const {
    return fGetExtensionsString(hdc);
}