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pjs/gfx/gl/GLContextProviderWGL.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Bas Schouten <bschouten@mozilla.com>
* Vladimir Vukicevic <vladimir@pobox.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "GLContextProvider.h"
#include "GLContext.h"
#include "GLLibraryLoader.h"
#include "nsDebug.h"
#include "nsIWidget.h"
#include "WGLLibrary.h"
#include "gfxASurface.h"
#include "gfxImageSurface.h"
#include "gfxPlatform.h"
#include "gfxWindowsSurface.h"
#include "gfxCrashReporterUtils.h"
#include "prenv.h"
#include "mozilla/Preferences.h"
namespace mozilla {
namespace gl {
WGLLibrary sWGLLibrary;
static HWND gSharedWindow = 0;
static HDC gSharedWindowDC = 0;
static HGLRC gSharedWindowGLContext = 0;
static int gSharedWindowPixelFormat = 0;
static bool gUseDoubleBufferedWindows = false;
static HWND
CreateDummyWindow(HDC *aWindowDC = nsnull)
{
WNDCLASSW wc;
if (!GetClassInfoW(GetModuleHandle(NULL), L"GLContextWGLClass", &wc)) {
ZeroMemory(&wc, sizeof(WNDCLASSW));
wc.style = CS_OWNDC;
wc.hInstance = GetModuleHandle(NULL);
wc.lpfnWndProc = DefWindowProc;
wc.lpszClassName = L"GLContextWGLClass";
if (!RegisterClassW(&wc)) {
NS_WARNING("Failed to register GLContextWGLClass?!");
// er. failed to register our class?
return NULL;
}
}
HWND win = CreateWindowW(L"GLContextWGLClass", L"GLContextWGL", 0,
0, 0, 16, 16,
NULL, NULL, GetModuleHandle(NULL), NULL);
NS_ENSURE_TRUE(win, NULL);
HDC dc = GetDC(win);
NS_ENSURE_TRUE(dc, NULL);
if (gSharedWindowPixelFormat == 0) {
PIXELFORMATDESCRIPTOR pfd;
ZeroMemory(&pfd, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
if (gUseDoubleBufferedWindows)
pfd.dwFlags |= 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;
gSharedWindowPixelFormat = ChoosePixelFormat(dc, &pfd);
}
if (!gSharedWindowPixelFormat ||
!SetPixelFormat(dc, gSharedWindowPixelFormat, NULL))
{
NS_WARNING("SetPixelFormat failed!");
DestroyWindow(win);
return NULL;
}
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");
if (!mOGLLibrary) {
mOGLLibrary = PR_LoadLibrary("Opengl32.dll");
if (!mOGLLibrary) {
NS_WARNING("Couldn't load OpenGL DLL.");
return false;
}
}
gUseDoubleBufferedWindows = PR_GetEnv("MOZ_WGL_DB") != nsnull;
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.
gSharedWindow = CreateDummyWindow(&gSharedWindowDC);
NS_ENSURE_TRUE(gSharedWindow, false);
// create rendering context
gSharedWindowGLContext = fCreateContext(gSharedWindowDC);
NS_ENSURE_TRUE(gSharedWindowGLContext, false);
HGLRC curCtx = fGetCurrentContext();
HDC curDC = fGetCurrentDC();
if (!fMakeCurrent((HDC)gSharedWindowDC, (HGLRC)gSharedWindowGLContext)) {
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 = nsnull;
}
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 = nsnull;
}
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(gSharedWindowDC);
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(gSharedWindowGLContext);
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,
NULL
};
gSharedWindowGLContext = fCreateContextAttribs(gSharedWindowDC, NULL, attribs);
if (!gSharedWindowGLContext) {
mHasRobustness = false;
gSharedWindowGLContext = fCreateContext(gSharedWindowDC);
}
}
mInitialized = true;
// 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() == nsnull) {
mInitialized = false;
return false;
}
reporter.SetSuccessful();
return true;
}
class GLContextWGL : public GLContext
{
public:
GLContextWGL(const ContextFormat& aFormat,
GLContext *aSharedContext,
HDC aDC,
HGLRC aContext,
HWND aWindow = nsnull,
bool aIsOffscreen = false)
: GLContext(aFormat, aIsOffscreen, aSharedContext),
mDC(aDC),
mContext(aContext),
mWnd(aWindow),
mPBuffer(NULL),
mPixelFormat(0),
mIsDoubleBuffered(false)
{
}
GLContextWGL(const ContextFormat& aFormat,
GLContext *aSharedContext,
HANDLE aPbuffer,
HDC aDC,
HGLRC aContext,
int aPixelFormat)
: GLContext(aFormat, true, aSharedContext),
mDC(aDC),
mContext(aContext),
mWnd(NULL),
mPBuffer(aPbuffer),
mPixelFormat(aPixelFormat),
mIsDoubleBuffered(false)
{
}
~GLContextWGL()
{
MarkDestroyed();
sWGLLibrary.fDeleteContext(mContext);
if (mPBuffer)
sWGLLibrary.fDestroyPbuffer(mPBuffer);
if (mWnd)
DestroyWindow(mWnd);
}
GLContextType GetContextType() {
return ContextTypeWGL;
}
bool Init()
{
if (!mDC || !mContext)
return false;
MakeCurrent();
SetupLookupFunction();
if (!InitWithPrefix("gl", true))
return false;
InitFramebuffers();
return true;
}
bool MakeCurrentImpl(bool aForce = false)
{
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 || sWGLLibrary.fGetCurrentContext() != mContext) {
succeeded = sWGLLibrary.fMakeCurrent(mDC, mContext);
NS_ASSERTION(succeeded, "Failed to make GL context current!");
}
return succeeded;
}
void SetIsDoubleBuffered(bool aIsDB) {
mIsDoubleBuffered = aIsDB;
}
virtual bool IsDoubleBuffered() {
return mIsDoubleBuffered;
}
bool SupportsRobustness()
{
return sWGLLibrary.HasRobustness();
}
virtual bool SwapBuffers() {
if (!mIsDoubleBuffered)
return false;
return ::SwapBuffers(mDC);
}
bool SetupLookupFunction()
{
mLookupFunc = (PlatformLookupFunction)sWGLLibrary.fGetProcAddress;
return true;
}
void *GetNativeData(NativeDataType aType)
{
switch (aType) {
case NativeGLContext:
return mContext;
default:
return nsnull;
}
}
bool BindTex2DOffscreen(GLContext *aOffscreen);
void UnbindTex2DOffscreen(GLContext *aOffscreen);
bool ResizeOffscreen(const gfxIntSize& aNewSize);
HGLRC Context() { return mContext; }
protected:
friend class GLContextProviderWGL;
HDC mDC;
HGLRC mContext;
HWND mWnd;
HANDLE mPBuffer;
int mPixelFormat;
bool mIsDoubleBuffered;
};
bool
GLContextWGL::BindTex2DOffscreen(GLContext *aOffscreen)
{
if (aOffscreen->GetContextType() != ContextTypeWGL) {
NS_WARNING("non-WGL context");
return false;
}
if (!aOffscreen->IsOffscreen()) {
NS_WARNING("non-offscreen context");
return false;
}
GLContextWGL *offs = static_cast<GLContextWGL*>(aOffscreen);
if (offs->mPBuffer) {
BOOL ok = sWGLLibrary.fBindTexImage(offs->mPBuffer,
LOCAL_WGL_FRONT_LEFT_ARB);
if (!ok) {
NS_WARNING("CanvasLayerOGL::Updated wglBindTexImageARB failed");
return false;
}
} else if (offs->mOffscreenTexture) {
if (offs->GetSharedContext() != GLContextProviderWGL::GetGlobalContext())
{
NS_WARNING("offscreen FBO context can only be bound with context sharing!");
return false;
}
fBindTexture(LOCAL_GL_TEXTURE_2D, offs->mOffscreenTexture);
} else {
NS_WARNING("don't know how to bind this!");
return false;
}
return true;
}
void
GLContextWGL::UnbindTex2DOffscreen(GLContext *aOffscreen)
{
NS_ASSERTION(aOffscreen->GetContextType() == ContextTypeWGL, "wrong type");
GLContextWGL *offs = static_cast<GLContextWGL*>(aOffscreen);
if (offs->mPBuffer) {
// XXX so, according to the extension, ReleaseTexImage is not required to
// preserve color buffer contents. This sucks, but everywhere that I've
// tried it the color buffer is preserved. So let's cross our fingers..
sWGLLibrary.fReleaseTexImage(offs->mPBuffer, LOCAL_WGL_FRONT_LEFT_ARB);
}
}
static bool
GetMaxSize(HDC hDC, int format, gfxIntSize& 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 (!sWGLLibrary.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 gfxIntSize& requested)
{
gfxIntSize max;
if (!GetMaxSize(hDC, format, max))
return true;
if (requested.width > max.width)
return false;
if (requested.height > max.height)
return false;
return true;
}
bool
GLContextWGL::ResizeOffscreen(const gfxIntSize& aNewSize)
{
if (mPBuffer) {
if (!IsValidSizeForFormat(gSharedWindowDC, mPixelFormat, aNewSize))
return false;
int pbattrs[] = {
LOCAL_WGL_TEXTURE_FORMAT_ARB,
mCreationFormat.alpha > 0 ? LOCAL_WGL_TEXTURE_RGBA_ARB
: LOCAL_WGL_TEXTURE_RGB_ARB,
LOCAL_WGL_TEXTURE_TARGET_ARB, LOCAL_WGL_TEXTURE_2D_ARB,
0
};
HANDLE newbuf = sWGLLibrary.fCreatePbuffer(gSharedWindowDC, mPixelFormat,
aNewSize.width, aNewSize.height,
pbattrs);
if (!newbuf)
return false;
bool isCurrent = false;
if (sWGLLibrary.fGetCurrentContext() == mContext) {
sWGLLibrary.fMakeCurrent(NULL, NULL);
isCurrent = true;
}
sWGLLibrary.fDestroyPbuffer(mPBuffer);
mPBuffer = newbuf;
mDC = sWGLLibrary.fGetPbufferDC(mPBuffer);
mOffscreenSize = aNewSize;
mOffscreenActualSize = aNewSize;
MakeCurrent();
ClearSafely();
return ResizeOffscreenFBO(aNewSize, false);
}
return ResizeOffscreenFBO(aNewSize, true);
}
static GLContextWGL *
GetGlobalContextWGL()
{
return static_cast<GLContextWGL*>(GLContextProviderWGL::GetGlobalContext());
}
already_AddRefed<GLContext>
GLContextProviderWGL::CreateForWindow(nsIWidget *aWidget)
{
if (!sWGLLibrary.EnsureInitialized()) {
return nsnull;
}
/**
* 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, gSharedWindowPixelFormat, NULL);
HGLRC context;
GLContextWGL *shareContext = GetGlobalContextWGL();
if (sWGLLibrary.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,
NULL
};
context = sWGLLibrary.fCreateContextAttribs(dc,
shareContext ? shareContext->Context() : nsnull,
attribs);
if (!context && shareContext) {
context = sWGLLibrary.fCreateContextAttribs(dc, nsnull, attribs);
if (context) {
shareContext = nsnull;
}
} else {
context = sWGLLibrary.fCreateContext(dc);
if (context && shareContext && !sWGLLibrary.fShareLists(shareContext->Context(), context)) {
shareContext = nsnull;
}
}
} else {
context = sWGLLibrary.fCreateContext(dc);
if (context &&
shareContext &&
!sWGLLibrary.fShareLists(shareContext->Context(), context))
{
shareContext = nsnull;
}
}
if (!context) {
return nsnull;
}
nsRefPtr<GLContextWGL> glContext = new GLContextWGL(ContextFormat(ContextFormat::BasicRGB24),
shareContext, dc, context);
if (!glContext->Init()) {
return nsnull;
}
glContext->SetIsDoubleBuffered(gUseDoubleBufferedWindows);
return glContext.forget();
}
static already_AddRefed<GLContextWGL>
CreatePBufferOffscreenContext(const gfxIntSize& aSize,
const ContextFormat& aFormat)
{
#define A1(_a,_x) do { _a.AppendElement(_x); } while(0)
#define A2(_a,_x,_y) do { _a.AppendElement(_x); _a.AppendElement(_y); } while(0)
nsTArray<int> attrs;
A2(attrs, LOCAL_WGL_SUPPORT_OPENGL_ARB, LOCAL_GL_TRUE);
A2(attrs, LOCAL_WGL_DRAW_TO_PBUFFER_ARB, LOCAL_GL_TRUE);
A2(attrs, LOCAL_WGL_DOUBLE_BUFFER_ARB, LOCAL_GL_FALSE);
A2(attrs, LOCAL_WGL_ACCELERATION_ARB, LOCAL_WGL_FULL_ACCELERATION_ARB);
A2(attrs, LOCAL_WGL_COLOR_BITS_ARB, aFormat.colorBits());
A2(attrs, LOCAL_WGL_RED_BITS_ARB, aFormat.red);
A2(attrs, LOCAL_WGL_GREEN_BITS_ARB, aFormat.green);
A2(attrs, LOCAL_WGL_BLUE_BITS_ARB, aFormat.blue);
A2(attrs, LOCAL_WGL_ALPHA_BITS_ARB, aFormat.alpha);
A2(attrs, LOCAL_WGL_DEPTH_BITS_ARB, aFormat.depth);
A2(attrs, LOCAL_WGL_STENCIL_BITS_ARB, aFormat.stencil);
if (aFormat.alpha > 0) {
A2(attrs, LOCAL_WGL_BIND_TO_TEXTURE_RGBA_ARB, LOCAL_GL_TRUE);
} else {
A2(attrs, LOCAL_WGL_BIND_TO_TEXTURE_RGB_ARB, LOCAL_GL_TRUE);
}
A2(attrs, LOCAL_WGL_DOUBLE_BUFFER_ARB, LOCAL_GL_FALSE);
A2(attrs, LOCAL_WGL_STEREO_ARB, LOCAL_GL_FALSE);
A1(attrs, 0);
nsTArray<int> pbattrs;
A2(pbattrs, LOCAL_WGL_TEXTURE_TARGET_ARB, LOCAL_WGL_TEXTURE_2D_ARB);
if (aFormat.alpha > 0) {
A2(pbattrs, LOCAL_WGL_TEXTURE_FORMAT_ARB, LOCAL_WGL_TEXTURE_RGBA_ARB);
} else {
A2(pbattrs, LOCAL_WGL_TEXTURE_FORMAT_ARB, LOCAL_WGL_TEXTURE_RGB_ARB);
}
A1(pbattrs, 0);
UINT numFormats = 256;
int formats[256];
if (!sWGLLibrary.fChoosePixelFormat(gSharedWindowDC,
attrs.Elements(), NULL,
numFormats, formats, &numFormats)
|| numFormats == 0)
{
return nsnull;
}
// XXX add back the priority choosing code here
int chosenFormat = formats[0];
if (!IsValidSizeForFormat(gSharedWindowDC, chosenFormat, aSize))
return nsnull;
HANDLE pbuffer = sWGLLibrary.fCreatePbuffer(gSharedWindowDC, chosenFormat,
aSize.width, aSize.height,
pbattrs.Elements());
if (!pbuffer) {
return nsnull;
}
HDC pbdc = sWGLLibrary.fGetPbufferDC(pbuffer);
NS_ASSERTION(pbdc, "expected a dc");
HGLRC context;
if (sWGLLibrary.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,
NULL
};
context = sWGLLibrary.fCreateContextAttribs(pbdc, nsnull, attribs);
} else {
context = sWGLLibrary.fCreateContext(pbdc);
}
if (!context) {
sWGLLibrary.fDestroyPbuffer(pbuffer);
return false;
}
nsRefPtr<GLContextWGL> glContext = new GLContextWGL(aFormat,
nsnull,
pbuffer,
pbdc,
context,
chosenFormat);
return glContext.forget();
}
static already_AddRefed<GLContextWGL>
CreateWindowOffscreenContext(const ContextFormat& aFormat)
{
// CreateWindowOffscreenContext must return a global-shared context
GLContextWGL *shareContext = GetGlobalContextWGL();
if (!shareContext) {
return nsnull;
}
HDC dc;
HWND win = CreateDummyWindow(&dc);
if (!win) {
return nsnull;
}
HGLRC context = sWGLLibrary.fCreateContext(dc);
if (sWGLLibrary.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,
NULL
};
context = sWGLLibrary.fCreateContextAttribs(dc, shareContext->Context(), attribs);
} else {
context = sWGLLibrary.fCreateContext(dc);
if (context && shareContext &&
!sWGLLibrary.fShareLists(shareContext->Context(), context))
{
NS_WARNING("wglShareLists failed!");
sWGLLibrary.fDeleteContext(context);
DestroyWindow(win);
return nsnull;
}
}
if (!context) {
return nsnull;
}
nsRefPtr<GLContextWGL> glContext = new GLContextWGL(aFormat, shareContext,
dc, context, win, true);
return glContext.forget();
}
already_AddRefed<GLContext>
GLContextProviderWGL::CreateOffscreen(const gfxIntSize& aSize,
const ContextFormat& aFormat,
const ContextFlags)
{
if (!sWGLLibrary.EnsureInitialized()) {
return nsnull;
}
nsRefPtr<GLContextWGL> glContext;
// Always try to create a pbuffer context first, because we
// want the context isolation.
NS_ENSURE_TRUE(Preferences::GetRootBranch(), nsnull);
const bool preferFBOs = Preferences::GetBool("wgl.prefer-fbo", false);
if (!preferFBOs &&
sWGLLibrary.fCreatePbuffer &&
sWGLLibrary.fChoosePixelFormat)
{
glContext = CreatePBufferOffscreenContext(aSize, aFormat);
}
// If it failed, then create a window context and use a FBO.
if (!glContext) {
glContext = CreateWindowOffscreenContext(aFormat);
}
if (!glContext ||
!glContext->Init())
{
return nsnull;
}
if (!glContext->ResizeOffscreenFBO(aSize, !glContext->mPBuffer))
return nsnull;
glContext->mOffscreenSize = aSize;
glContext->mOffscreenActualSize = aSize;
return glContext.forget();
}
already_AddRefed<GLContext>
GLContextProviderWGL::CreateForNativePixmapSurface(gfxASurface *aSurface)
{
return nsnull;
}
static nsRefPtr<GLContextWGL> gGlobalContext;
GLContext *
GLContextProviderWGL::GetGlobalContext()
{
if (!sWGLLibrary.EnsureInitialized()) {
return nsnull;
}
static bool triedToCreateContext = false;
if (!triedToCreateContext && !gGlobalContext) {
triedToCreateContext = true;
// conveniently, we already have what we need...
gGlobalContext = new GLContextWGL(ContextFormat(ContextFormat::BasicRGB24), nsnull,
gSharedWindowDC, gSharedWindowGLContext);
if (!gGlobalContext->Init()) {
NS_WARNING("Global context GLContext initialization failed?");
gGlobalContext = nsnull;
return false;
}
gGlobalContext->SetIsGlobalSharedContext(true);
}
return static_cast<GLContext*>(gGlobalContext);
}
void
GLContextProviderWGL::Shutdown()
{
gGlobalContext = nsnull;
}
} /* namespace gl */
} /* namespace mozilla */
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