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-rw-r--r--gfx/gl/GLContextProviderWGL.cpp651
1 files changed, 651 insertions, 0 deletions
diff --git a/gfx/gl/GLContextProviderWGL.cpp b/gfx/gl/GLContextProviderWGL.cpp
new file mode 100644
index 000000000..a1373f78f
--- /dev/null
+++ b/gfx/gl/GLContextProviderWGL.cpp
@@ -0,0 +1,651 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GLContextProvider.h"
+#include "GLContextWGL.h"
+#include "GLLibraryLoader.h"
+#include "nsDebug.h"
+#include "nsIWidget.h"
+#include "gfxPlatform.h"
+#include "gfxWindowsSurface.h"
+
+#include "gfxCrashReporterUtils.h"
+
+#include "prenv.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/widget/CompositorWidget.h"
+
+namespace mozilla {
+namespace gl {
+
+using namespace mozilla::gfx;
+using namespace mozilla::widget;
+
+WGLLibrary sWGLLib;
+
+HWND
+WGLLibrary::CreateDummyWindow(HDC* aWindowDC)
+{
+ WNDCLASSW wc;
+ if (!GetClassInfoW(GetModuleHandle(nullptr), L"GLContextWGLClass", &wc)) {
+ ZeroMemory(&wc, sizeof(WNDCLASSW));
+ wc.style = CS_OWNDC;
+ wc.hInstance = GetModuleHandle(nullptr);
+ wc.lpfnWndProc = DefWindowProc;
+ wc.lpszClassName = L"GLContextWGLClass";
+ if (!RegisterClassW(&wc)) {
+ NS_WARNING("Failed to register GLContextWGLClass?!");
+ // er. failed to register our class?
+ return nullptr;
+ }
+ }
+
+ HWND win = CreateWindowW(L"GLContextWGLClass", L"GLContextWGL", 0,
+ 0, 0, 16, 16,
+ nullptr, nullptr, GetModuleHandle(nullptr),
+ nullptr);
+ NS_ENSURE_TRUE(win, nullptr);
+
+ HDC dc = GetDC(win);
+ NS_ENSURE_TRUE(dc, nullptr);
+
+ if (mWindowPixelFormat == 0) {
+ PIXELFORMATDESCRIPTOR pfd;
+ ZeroMemory(&pfd, sizeof(PIXELFORMATDESCRIPTOR));
+ pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
+ pfd.nVersion = 1;
+ pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
+ pfd.iPixelType = PFD_TYPE_RGBA;
+ pfd.cColorBits = 24;
+ pfd.cRedBits = 8;
+ pfd.cGreenBits = 8;
+ pfd.cBlueBits = 8;
+ pfd.cAlphaBits = 8;
+ pfd.cDepthBits = 0;
+ pfd.iLayerType = PFD_MAIN_PLANE;
+
+ mWindowPixelFormat = ChoosePixelFormat(dc, &pfd);
+ }
+
+ if (!mWindowPixelFormat ||
+ !SetPixelFormat(dc, mWindowPixelFormat, nullptr))
+ {
+ NS_WARNING("SetPixelFormat failed!");
+ DestroyWindow(win);
+ return nullptr;
+ }
+
+ if (aWindowDC) {
+ *aWindowDC = dc;
+ }
+
+ return win;
+}
+
+static inline bool
+HasExtension(const char* aExtensions, const char* aRequiredExtension)
+{
+ return GLContext::ListHasExtension(
+ reinterpret_cast<const GLubyte*>(aExtensions), aRequiredExtension);
+}
+
+bool
+WGLLibrary::EnsureInitialized()
+{
+ if (mInitialized)
+ return true;
+
+ mozilla::ScopedGfxFeatureReporter reporter("WGL");
+
+ std::string libGLFilename = "Opengl32.dll";
+ // SU_SPIES_DIRECTORY is for AMD CodeXL/gDEBugger
+ if (PR_GetEnv("SU_SPIES_DIRECTORY")) {
+ libGLFilename = std::string(PR_GetEnv("SU_SPIES_DIRECTORY")) + "\\opengl32.dll";
+ }
+
+ if (!mOGLLibrary) {
+ mOGLLibrary = PR_LoadLibrary(libGLFilename.c_str());
+ if (!mOGLLibrary) {
+ NS_WARNING("Couldn't load OpenGL library.");
+ return false;
+ }
+ }
+
+ const GLLibraryLoader::SymLoadStruct earlySymbols[] = {
+ { (PRFuncPtr*) &fCreateContext, { "wglCreateContext", nullptr } },
+ { (PRFuncPtr*) &fMakeCurrent, { "wglMakeCurrent", nullptr } },
+ { (PRFuncPtr*) &fGetProcAddress, { "wglGetProcAddress", nullptr } },
+ { (PRFuncPtr*) &fDeleteContext, { "wglDeleteContext", nullptr } },
+ { (PRFuncPtr*) &fGetCurrentContext, { "wglGetCurrentContext", nullptr } },
+ { (PRFuncPtr*) &fGetCurrentDC, { "wglGetCurrentDC", nullptr } },
+ { nullptr, { nullptr } }
+ };
+
+ 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);
+
+ if (!fMakeCurrent(mWindowDC, mWindowGLContext)) {
+ NS_WARNING("wglMakeCurrent failed");
+ return false;
+ }
+
+ const auto curCtx = fGetCurrentContext();
+ const auto curDC = fGetCurrentDC();
+
+ const auto lookupFunc = (GLLibraryLoader::PlatformLookupFunction)fGetProcAddress;
+
+ // Now we can grab all the other symbols that we couldn't without having
+ // a context current.
+ const GLLibraryLoader::SymLoadStruct pbufferSymbols[] = {
+ { (PRFuncPtr*) &fCreatePbuffer, { "wglCreatePbufferARB", "wglCreatePbufferEXT", nullptr } },
+ { (PRFuncPtr*) &fDestroyPbuffer, { "wglDestroyPbufferARB", "wglDestroyPbufferEXT", nullptr } },
+ { (PRFuncPtr*) &fGetPbufferDC, { "wglGetPbufferDCARB", "wglGetPbufferDCEXT", nullptr } },
+ { (PRFuncPtr*) &fBindTexImage, { "wglBindTexImageARB", "wglBindTexImageEXT", nullptr } },
+ { (PRFuncPtr*) &fReleaseTexImage, { "wglReleaseTexImageARB", "wglReleaseTexImageEXT", nullptr } },
+ { nullptr, { nullptr } }
+ };
+
+ const GLLibraryLoader::SymLoadStruct pixFmtSymbols[] = {
+ { (PRFuncPtr*) &fChoosePixelFormat, { "wglChoosePixelFormatARB", "wglChoosePixelFormatEXT", nullptr } },
+ { (PRFuncPtr*) &fGetPixelFormatAttribiv, { "wglGetPixelFormatAttribivARB", "wglGetPixelFormatAttribivEXT", nullptr } },
+ { nullptr, { nullptr } }
+ };
+
+ if (!GLLibraryLoader::LoadSymbols(mOGLLibrary, &pbufferSymbols[0], lookupFunc)) {
+ // this isn't an error, just means that pbuffers aren't supported
+ fCreatePbuffer = nullptr;
+ }
+
+ if (!GLLibraryLoader::LoadSymbols(mOGLLibrary, &pixFmtSymbols[0], lookupFunc)) {
+ // this isn't an error, just means that we don't have the pixel format extension
+ fChoosePixelFormat = nullptr;
+ }
+
+ const GLLibraryLoader::SymLoadStruct extensionsSymbols[] = {
+ { (PRFuncPtr*) &fGetExtensionsString, { "wglGetExtensionsStringARB", nullptr} },
+ { nullptr, { nullptr } }
+ };
+
+ const GLLibraryLoader::SymLoadStruct robustnessSymbols[] = {
+ { (PRFuncPtr*) &fCreateContextAttribs, { "wglCreateContextAttribsARB", nullptr} },
+ { nullptr, { nullptr } }
+ };
+
+ const GLLibraryLoader::SymLoadStruct dxInteropSymbols[] = {
+ { (PRFuncPtr*)&fDXSetResourceShareHandle,{ "wglDXSetResourceShareHandleNV", nullptr } },
+ { (PRFuncPtr*)&fDXOpenDevice, { "wglDXOpenDeviceNV", nullptr } },
+ { (PRFuncPtr*)&fDXCloseDevice, { "wglDXCloseDeviceNV", nullptr } },
+ { (PRFuncPtr*)&fDXRegisterObject, { "wglDXRegisterObjectNV", nullptr } },
+ { (PRFuncPtr*)&fDXUnregisterObject, { "wglDXUnregisterObjectNV", nullptr } },
+ { (PRFuncPtr*)&fDXObjectAccess, { "wglDXObjectAccessNV", nullptr } },
+ { (PRFuncPtr*)&fDXLockObjects, { "wglDXLockObjectsNV", nullptr } },
+ { (PRFuncPtr*)&fDXUnlockObjects, { "wglDXUnlockObjectsNV", nullptr } },
+ { nullptr, { nullptr } }
+ };
+
+ if (GLLibraryLoader::LoadSymbols(mOGLLibrary, &extensionsSymbols[0], lookupFunc)) {
+ const char* extString = fGetExtensionsString(mWindowDC);
+ MOZ_ASSERT(extString);
+ MOZ_ASSERT(HasExtension(extString, "WGL_ARB_extensions_string"));
+
+ if (HasExtension(extString, "WGL_ARB_create_context")) {
+ if (GLLibraryLoader::LoadSymbols(mOGLLibrary, &robustnessSymbols[0], lookupFunc)) {
+ if (HasExtension(extString, "WGL_ARB_create_context_robustness")) {
+ mHasRobustness = true;
+ }
+ } else {
+ NS_ERROR("WGL supports ARB_create_context without supplying its functions.");
+ fCreateContextAttribs = nullptr;
+ }
+ }
+
+ ////
+
+ mHasDXInterop = HasExtension(extString, "WGL_NV_DX_interop");
+ mHasDXInterop2 = HasExtension(extString, "WGL_NV_DX_interop2");
+
+ nsCString blocklistId;
+ if (gfxUtils::IsFeatureBlacklisted(nullptr, nsIGfxInfo::FEATURE_DX_INTEROP2,
+ &blocklistId) &&
+ !gfxPrefs::IgnoreDXInterop2Blacklist())
+ {
+ mHasDXInterop2 = false;
+ }
+
+ if (mHasDXInterop || mHasDXInterop2) {
+ if (!GLLibraryLoader::LoadSymbols(mOGLLibrary, &dxInteropSymbols[0],
+ lookupFunc))
+ {
+ NS_ERROR("WGL supports NV_DX_interop(2) without supplying its functions.");
+ fDXSetResourceShareHandle = nullptr;
+ fDXOpenDevice = nullptr;
+ fDXCloseDevice = nullptr;
+ fDXRegisterObject = nullptr;
+ fDXUnregisterObject = nullptr;
+ fDXObjectAccess = nullptr;
+ fDXLockObjects = nullptr;
+ fDXUnlockObjects = nullptr;
+
+ mHasDXInterop = false;
+ mHasDXInterop2 = false;
+ }
+ }
+ }
+
+ // reset back to the previous context, just in case
+ fMakeCurrent(curDC, curCtx);
+
+ if (mHasRobustness) {
+ fDeleteContext(mWindowGLContext);
+
+ const 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, nullptr, attribs);
+ if (!mWindowGLContext) {
+ mHasRobustness = false;
+ mWindowGLContext = fCreateContext(mWindowDC);
+ }
+ }
+
+ mInitialized = true;
+
+ reporter.SetSuccessful();
+ return true;
+}
+
+GLContextWGL::GLContextWGL(CreateContextFlags flags, const SurfaceCaps& caps,
+ bool isOffscreen, HDC aDC, HGLRC aContext, HWND aWindow)
+ : GLContext(flags, caps, nullptr, isOffscreen),
+ mDC(aDC),
+ mContext(aContext),
+ mWnd(aWindow),
+ mPBuffer(nullptr),
+ mPixelFormat(0),
+ mIsDoubleBuffered(false)
+{
+ // See 899855
+ SetProfileVersion(ContextProfile::OpenGLCompatibility, 200);
+}
+
+GLContextWGL::GLContextWGL(CreateContextFlags flags, const SurfaceCaps& caps,
+ bool isOffscreen, HANDLE aPbuffer, HDC aDC, HGLRC aContext,
+ int aPixelFormat)
+ : GLContext(flags, caps, nullptr, isOffscreen),
+ mDC(aDC),
+ mContext(aContext),
+ mWnd(nullptr),
+ mPBuffer(aPbuffer),
+ mPixelFormat(aPixelFormat),
+ mIsDoubleBuffered(false)
+{
+ // See 899855
+ SetProfileVersion(ContextProfile::OpenGLCompatibility, 200);
+}
+
+GLContextWGL::~GLContextWGL()
+{
+ MarkDestroyed();
+
+ sWGLLib.fDeleteContext(mContext);
+
+ if (mPBuffer)
+ sWGLLib.fDestroyPbuffer(mPBuffer);
+ if (mWnd)
+ DestroyWindow(mWnd);
+}
+
+bool
+GLContextWGL::Init()
+{
+ if (!mDC || !mContext)
+ return false;
+
+ // see bug 929506 comment 29. wglGetProcAddress requires a current context.
+ if (!sWGLLib.fMakeCurrent(mDC, mContext))
+ return false;
+
+ SetupLookupFunction();
+ if (!InitWithPrefix("gl", true))
+ return false;
+
+ return true;
+}
+
+bool
+GLContextWGL::MakeCurrentImpl(bool aForce)
+{
+ BOOL succeeded = true;
+
+ // wglGetCurrentContext seems to just pull the HGLRC out
+ // of its TLS slot, so no need to do our own tls slot.
+ // You would think that wglMakeCurrent would avoid doing
+ // work if mContext was already current, but not so much..
+ if (aForce || sWGLLib.fGetCurrentContext() != mContext) {
+ succeeded = sWGLLib.fMakeCurrent(mDC, mContext);
+ NS_ASSERTION(succeeded, "Failed to make GL context current!");
+ }
+
+ return succeeded;
+}
+
+bool
+GLContextWGL::IsCurrent()
+{
+ return sWGLLib.fGetCurrentContext() == mContext;
+}
+
+void
+GLContextWGL::SetIsDoubleBuffered(bool aIsDB)
+{
+ mIsDoubleBuffered = aIsDB;
+}
+
+bool
+GLContextWGL::IsDoubleBuffered() const
+{
+ return mIsDoubleBuffered;
+}
+
+bool
+GLContextWGL::SupportsRobustness() const
+{
+ return sWGLLib.HasRobustness();
+}
+
+bool
+GLContextWGL::SwapBuffers() {
+ if (!mIsDoubleBuffered)
+ return false;
+ return ::SwapBuffers(mDC);
+}
+
+bool
+GLContextWGL::SetupLookupFunction()
+{
+ // Make sure that we have a ref to the OGL library;
+ // when run under CodeXL, wglGetProcAddress won't return
+ // the right thing for some core functions.
+ MOZ_ASSERT(mLibrary == nullptr);
+
+ mLibrary = sWGLLib.GetOGLLibrary();
+ mLookupFunc = (PlatformLookupFunction)sWGLLib.fGetProcAddress;
+ return true;
+}
+
+static bool
+GetMaxSize(HDC hDC, int format, IntSize& size)
+{
+ int query[] = {LOCAL_WGL_MAX_PBUFFER_WIDTH_ARB, LOCAL_WGL_MAX_PBUFFER_HEIGHT_ARB};
+ int result[2];
+
+ // (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, int* piAttributes, int* piValues)
+ if (!sWGLLib.fGetPixelFormatAttribiv(hDC, format, 0, 2, query, result))
+ return false;
+
+ size.width = result[0];
+ size.height = result[1];
+ return true;
+}
+
+static bool
+IsValidSizeForFormat(HDC hDC, int format,
+ const IntSize& requested)
+{
+ IntSize max;
+ if (!GetMaxSize(hDC, format, max))
+ return true;
+
+ if (requested.width > max.width)
+ return false;
+ if (requested.height > max.height)
+ return false;
+
+ return true;
+}
+
+static GLContextWGL*
+GetGlobalContextWGL()
+{
+ return static_cast<GLContextWGL*>(GLContextProviderWGL::GetGlobalContext());
+}
+
+already_AddRefed<GLContext>
+GLContextProviderWGL::CreateWrappingExisting(void*, void*)
+{
+ return nullptr;
+}
+
+already_AddRefed<GLContext>
+GLContextProviderWGL::CreateForCompositorWidget(CompositorWidget* aCompositorWidget, bool aForceAccelerated)
+{
+ return CreateForWindow(aCompositorWidget->RealWidget(), aForceAccelerated);
+}
+
+already_AddRefed<GLContext>
+GLContextProviderWGL::CreateForWindow(nsIWidget* aWidget, bool aForceAccelerated)
+{
+ if (!sWGLLib.EnsureInitialized()) {
+ return nullptr;
+ }
+
+ /**
+ * We need to make sure we call SetPixelFormat -after- calling
+ * EnsureInitialized, otherwise it can load/unload the dll and
+ * wglCreateContext will fail.
+ */
+
+ HDC dc = (HDC)aWidget->GetNativeData(NS_NATIVE_GRAPHIC);
+
+ SetPixelFormat(dc, sWGLLib.GetWindowPixelFormat(), nullptr);
+ HGLRC context;
+
+ if (sWGLLib.HasRobustness()) {
+ 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
+ };
+
+ context = sWGLLib.fCreateContextAttribs(dc, nullptr, attribs);
+ } else {
+ context = sWGLLib.fCreateContext(dc);
+ }
+
+ if (!context) {
+ return nullptr;
+ }
+
+ SurfaceCaps caps = SurfaceCaps::ForRGBA();
+ RefPtr<GLContextWGL> glContext = new GLContextWGL(CreateContextFlags::NONE, caps,
+ false, dc, context);
+ if (!glContext->Init()) {
+ return nullptr;
+ }
+
+ glContext->SetIsDoubleBuffered(true);
+
+ return glContext.forget();
+}
+
+static already_AddRefed<GLContextWGL>
+CreatePBufferOffscreenContext(CreateContextFlags flags, const IntSize& aSize)
+{
+ WGLLibrary& wgl = sWGLLib;
+
+ const int pfAttribs[] = {
+ LOCAL_WGL_SUPPORT_OPENGL_ARB, LOCAL_GL_TRUE,
+ LOCAL_WGL_ACCELERATION_ARB, LOCAL_WGL_FULL_ACCELERATION_ARB,
+
+ LOCAL_WGL_DRAW_TO_PBUFFER_ARB, LOCAL_GL_TRUE,
+ LOCAL_WGL_DOUBLE_BUFFER_ARB, LOCAL_GL_FALSE,
+ LOCAL_WGL_STEREO_ARB, LOCAL_GL_FALSE,
+
+ 0
+ };
+
+ // We only need one!
+ static const uint32_t kMaxFormats = 1024;
+ int formats[kMaxFormats];
+ uint32_t foundFormats;
+ HDC windowDC = wgl.GetWindowDC();
+ if (!wgl.fChoosePixelFormat(windowDC, pfAttribs, nullptr, kMaxFormats, formats,
+ &foundFormats)
+ || foundFormats == 0)
+ {
+ return nullptr;
+ }
+
+ // We don't care; just pick the first one.
+ int chosenFormat = formats[0];
+ if (!IsValidSizeForFormat(windowDC, chosenFormat, aSize))
+ return nullptr;
+
+ const int pbAttribs[] = { 0 };
+ HANDLE pbuffer = wgl.fCreatePbuffer(windowDC, chosenFormat, aSize.width, aSize.height,
+ pbAttribs);
+ if (!pbuffer) {
+ return nullptr;
+ }
+
+ HDC pbdc = wgl.fGetPbufferDC(pbuffer);
+ NS_ASSERTION(pbdc, "expected a dc");
+
+ HGLRC context;
+ if (wgl.HasRobustness()) {
+ const 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
+ };
+ context = wgl.fCreateContextAttribs(pbdc, nullptr, attribs);
+ } else {
+ context = wgl.fCreateContext(pbdc);
+ }
+
+ if (!context) {
+ wgl.fDestroyPbuffer(pbuffer);
+ return nullptr;
+ }
+
+ SurfaceCaps dummyCaps = SurfaceCaps::Any();
+ RefPtr<GLContextWGL> glContext = new GLContextWGL(flags, dummyCaps, true, pbuffer,
+ pbdc, context, chosenFormat);
+ return glContext.forget();
+}
+
+static already_AddRefed<GLContextWGL>
+CreateWindowOffscreenContext()
+{
+ HDC dc;
+ HWND win = sWGLLib.CreateDummyWindow(&dc);
+ if (!win) {
+ return nullptr;
+ }
+
+ HGLRC context = sWGLLib.fCreateContext(dc);
+ if (sWGLLib.HasRobustness()) {
+ 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
+ };
+
+ context = sWGLLib.fCreateContextAttribs(dc, nullptr, attribs);
+ } else {
+ context = sWGLLib.fCreateContext(dc);
+ }
+
+ if (!context) {
+ return nullptr;
+ }
+
+ SurfaceCaps caps = SurfaceCaps::ForRGBA();
+ RefPtr<GLContextWGL> glContext = new GLContextWGL(CreateContextFlags::NONE, caps,
+ true, dc, context, win);
+ return glContext.forget();
+}
+
+/*static*/ already_AddRefed<GLContext>
+GLContextProviderWGL::CreateHeadless(CreateContextFlags flags,
+ nsACString* const out_failureId)
+{
+ if (!sWGLLib.EnsureInitialized()) {
+ return nullptr;
+ }
+
+ RefPtr<GLContextWGL> glContext;
+
+ // Always try to create a pbuffer context first, because we
+ // want the context isolation.
+ if (sWGLLib.fCreatePbuffer &&
+ sWGLLib.fChoosePixelFormat)
+ {
+ IntSize dummySize = IntSize(16, 16);
+ glContext = CreatePBufferOffscreenContext(flags, dummySize);
+ }
+
+ // If it failed, then create a window context and use a FBO.
+ if (!glContext) {
+ glContext = CreateWindowOffscreenContext();
+ }
+
+ if (!glContext ||
+ !glContext->Init())
+ {
+ return nullptr;
+ }
+
+ RefPtr<GLContext> retGL = glContext.get();
+ return retGL.forget();
+}
+
+/*static*/ already_AddRefed<GLContext>
+GLContextProviderWGL::CreateOffscreen(const IntSize& size,
+ const SurfaceCaps& minCaps,
+ CreateContextFlags flags,
+ nsACString* const out_failureId)
+{
+ RefPtr<GLContext> gl = CreateHeadless(flags, out_failureId);
+ if (!gl)
+ return nullptr;
+
+ if (!gl->InitOffscreen(size, minCaps)) {
+ *out_failureId = NS_LITERAL_CSTRING("FEATURE_FAILURE_WGL_INIT");
+ return nullptr;
+ }
+
+ return gl.forget();
+}
+
+/*static*/ GLContext*
+GLContextProviderWGL::GetGlobalContext()
+{
+ return nullptr;
+}
+
+/*static*/ void
+GLContextProviderWGL::Shutdown()
+{
+}
+
+} /* namespace gl */
+} /* namespace mozilla */