already_AddRefed<GLContext>
GLContextProviderGLX::CreateForWindow(nsIWidget *aWidget)
{
if (!sGLXLibrary.EnsureInitialized()) {
return nullptr;
}
// Currently, we take whatever Visual the window already has, and
// try to create an fbconfig for that visual. This isn't
// necessarily what we want in the long run; an fbconfig may not
// be available for the existing visual, or if it is, the GL
// performance might be suboptimal. But using the existing visual
// is a relatively safe intermediate step.
Display *display = (Display*)aWidget->GetNativeData(NS_NATIVE_DISPLAY);
if (!display) {
NS_ERROR("X Display required for GLX Context provider");
return nullptr;
}
int xscreen = DefaultScreen(display);
Window window = GET_NATIVE_WINDOW(aWidget);
int numConfigs;
ScopedXFree<GLXFBConfig> cfgs;
if (sGLXLibrary.IsATI() ||
!sGLXLibrary.GLXVersionCheck(1, 3)) {
const int attribs[] = {
LOCAL_GLX_DOUBLEBUFFER, False,
0
};
cfgs = sGLXLibrary.xChooseFBConfig(display,
xscreen,
attribs,
&numConfigs);
} else {
cfgs = sGLXLibrary.xGetFBConfigs(display,
xscreen,
&numConfigs);
}
if (!cfgs) {
NS_WARNING("[GLX] glXGetFBConfigs() failed");
return nullptr;
}
NS_ASSERTION(numConfigs > 0, "No FBConfigs found!");
// XXX the visual ID is almost certainly the LOCAL_GLX_FBCONFIG_ID, so
// we could probably do this first and replace the glXGetFBConfigs
// with glXChooseConfigs. Docs are sparklingly clear as always.
XWindowAttributes widgetAttrs;
if (!XGetWindowAttributes(display, window, &widgetAttrs)) {
NS_WARNING("[GLX] XGetWindowAttributes() failed");
return nullptr;
}
const VisualID widgetVisualID = XVisualIDFromVisual(widgetAttrs.visual);
#ifdef DEBUG
printf("[GLX] widget has VisualID 0x%lx\n", widgetVisualID);
#endif
int matchIndex = -1;
for (int i = 0; i < numConfigs; i++) {
int visid = None;
sGLXLibrary.xGetFBConfigAttrib(display, cfgs[i], LOCAL_GLX_VISUAL_ID, &visid);
if (!visid) {
continue;
}
if (sGLXLibrary.IsATI()) {
int depth;
Visual *visual;
FindVisualAndDepth(display, visid, &visual, &depth);
if (depth == widgetAttrs.depth &&
AreCompatibleVisuals(widgetAttrs.visual, visual)) {
matchIndex = i;
break;
}
} else {
if (widgetVisualID == static_cast<VisualID>(visid)) {
matchIndex = i;
break;
}
}
}
if (matchIndex == -1) {
NS_WARNING("[GLX] Couldn't find a FBConfig matching widget visual");
return nullptr;
}
GLContextGLX *shareContext = GetGlobalContextGLX();
SurfaceCaps caps = SurfaceCaps::Any();
nsRefPtr<GLContextGLX> glContext = GLContextGLX::CreateGLContext(caps,
shareContext,
false,
display,
window,
cfgs[matchIndex],
false);
return glContext.forget();
}
GLXPixmap
GLXLibrary::CreatePixmap(gfxASurface* aSurface)
{
if (!SupportsTextureFromPixmap(aSurface)) {
return None;
}
gfxXlibSurface *xs = static_cast<gfxXlibSurface*>(aSurface);
const XRenderPictFormat *format = xs->XRenderFormat();
if (!format || format->type != PictTypeDirect) {
return None;
}
const XRenderDirectFormat& direct = format->direct;
int alphaSize = FloorLog2(direct.alphaMask + 1);
NS_ASSERTION((1 << alphaSize) - 1 == direct.alphaMask,
"Unexpected render format with non-adjacent alpha bits");
int attribs[] = { LOCAL_GLX_DOUBLEBUFFER, False,
LOCAL_GLX_DRAWABLE_TYPE, LOCAL_GLX_PIXMAP_BIT,
LOCAL_GLX_ALPHA_SIZE, alphaSize,
(alphaSize ? LOCAL_GLX_BIND_TO_TEXTURE_RGBA_EXT
: LOCAL_GLX_BIND_TO_TEXTURE_RGB_EXT), True,
LOCAL_GLX_RENDER_TYPE, LOCAL_GLX_RGBA_BIT,
None };
int numConfigs = 0;
Display *display = xs->XDisplay();
int xscreen = DefaultScreen(display);
ScopedXFree<GLXFBConfig> cfgs(xChooseFBConfig(display,
xscreen,
attribs,
&numConfigs));
// Find an fbconfig that matches the pixel format used on the Pixmap.
int matchIndex = -1;
unsigned long redMask =
static_cast<unsigned long>(direct.redMask) << direct.red;
unsigned long greenMask =
static_cast<unsigned long>(direct.greenMask) << direct.green;
unsigned long blueMask =
static_cast<unsigned long>(direct.blueMask) << direct.blue;
// This is true if the Pixmap has bits for alpha or unused bits.
bool haveNonColorBits =
~(redMask | greenMask | blueMask) != -1UL << format->depth;
for (int i = 0; i < numConfigs; i++) {
int id = None;
sGLXLibrary.xGetFBConfigAttrib(display, cfgs[i], LOCAL_GLX_VISUAL_ID, &id);
Visual *visual;
int depth;
FindVisualAndDepth(display, id, &visual, &depth);
if (!visual ||
visual->c_class != TrueColor ||
visual->red_mask != redMask ||
visual->green_mask != greenMask ||
visual->blue_mask != blueMask ) {
continue;
}
// Historically Xlib Visuals did not try to represent an alpha channel
// and there was no means to use an alpha channel on a Pixmap. The
// Xlib Visual from the fbconfig was not intended to have any
// information about alpha bits.
//
// Since then, RENDER has added formats for 32 bit depth Pixmaps.
// Some of these formats have bits for alpha and some have unused
// bits.
//
// Then the Composite extension added a 32 bit depth Visual intended
// for Windows with an alpha channel, so bits not in the visual color
// masks were expected to be treated as alpha bits.
//
// Usually GLX counts only color bits in the Visual depth, but the
// depth of Composite's ARGB Visual includes alpha bits. However,
// bits not in the color masks are not necessarily alpha bits because
// sometimes (NVIDIA) 32 bit Visuals are added for fbconfigs with 32
// bit BUFFER_SIZE but zero alpha bits and 24 color bits (NVIDIA
// again).
//
// This checks that the depth matches in one of the two ways.
// NVIDIA now forces format->depth == depth so only the first way
// is checked for NVIDIA
if (depth != format->depth &&
(mIsNVIDIA || depth != format->depth - alphaSize) ) {
continue;
}
// If all bits of the Pixmap are color bits and the Pixmap depth
// matches the depth of the fbconfig visual, then we can assume that
// the driver will do whatever is necessary to ensure that any
// GLXPixmap alpha bits are treated as set. We can skip the
// ALPHA_SIZE check in this situation. We need to skip this check for
// situations (ATI) where there are no fbconfigs without alpha bits.
//
// glXChooseFBConfig should prefer configs with smaller
// LOCAL_GLX_BUFFER_SIZE, so we should still get zero alpha bits if
// available, except perhaps with NVIDIA drivers where buffer size is
// not the specified sum of the component sizes.
if (haveNonColorBits) {
// There are bits in the Pixmap format that haven't been matched
// against the fbconfig visual. These bits could either represent
// alpha or be unused, so just check that the number of alpha bits
// matches.
int size = 0;
sGLXLibrary.xGetFBConfigAttrib(display, cfgs[i],
LOCAL_GLX_ALPHA_SIZE, &size);
if (size != alphaSize) {
continue;
}
}
matchIndex = i;
break;
}
if (matchIndex == -1) {
// GLX can't handle A8 surfaces, so this is not really unexpected. The
// caller should deal with this situation.
NS_WARN_IF_FALSE(format->depth == 8,
"[GLX] Couldn't find a FBConfig matching Pixmap format");
return None;
}
int pixmapAttribs[] = { LOCAL_GLX_TEXTURE_TARGET_EXT, LOCAL_GLX_TEXTURE_2D_EXT,
LOCAL_GLX_TEXTURE_FORMAT_EXT,
(alphaSize ? LOCAL_GLX_TEXTURE_FORMAT_RGBA_EXT
: LOCAL_GLX_TEXTURE_FORMAT_RGB_EXT),
None};
GLXPixmap glxpixmap = xCreatePixmap(display,
cfgs[matchIndex],
xs->XDrawable(),
pixmapAttribs);
return glxpixmap;
}
static already_AddRefed<GLContextGLX>
CreateOffscreenPixmapContext(const gfxIntSize& aSize,
const ContextFormat& aFormat,
PRBool aShare)
{
if (!sGLXLibrary.EnsureInitialized()) {
return nsnull;
}
Display *display = DefaultXDisplay();
int xscreen = DefaultScreen(display);
int attribs[] = {
GLX_DOUBLEBUFFER, False,
GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT,
GLX_X_RENDERABLE, True,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_ALPHA_SIZE, 0,
GLX_DEPTH_SIZE, 0,
0
};
int numConfigs = 0;
ScopedXFree<GLXFBConfig> cfgs;
cfgs = sGLXLibrary.xChooseFBConfig(display,
xscreen,
attribs,
&numConfigs);
if (!cfgs) {
return nsnull;
}
NS_ASSERTION(numConfigs > 0,
"glXChooseFBConfig() failed to match our requested format and violated its spec (!)");
ScopedXFree<XVisualInfo> vinfo;
int chosenIndex;
for (int i = 0; i < numConfigs; ++i) {
int dtype, visid;
if (sGLXLibrary.xGetFBConfigAttrib(display, cfgs[i], GLX_DRAWABLE_TYPE, &dtype) != Success
|| !(dtype & GLX_PIXMAP_BIT))
{
continue;
}
if (sGLXLibrary.xGetFBConfigAttrib(display, cfgs[i], GLX_VISUAL_ID, &visid) != Success
|| visid == 0)
{
continue;
}
vinfo = sGLXLibrary.xGetVisualFromFBConfig(display, cfgs[i]);
if (vinfo) {
chosenIndex = i;
break;
}
}
if (!vinfo) {
NS_WARNING("glXChooseFBConfig() didn't give us any configs with visuals!");
return nsnull;
}
nsRefPtr<gfxXlibSurface> xsurface = gfxXlibSurface::Create(DefaultScreenOfDisplay(display),
vinfo->visual,
gfxIntSize(16, 16));
if (xsurface->CairoStatus() != 0) {
return nsnull;
}
GLXPixmap glxpixmap = sGLXLibrary.xCreatePixmap(display,
cfgs[chosenIndex],
xsurface->XDrawable(),
NULL);
if (glxpixmap == 0) {
return nsnull;
}
GLContextGLX *shareContext = aShare ? GetGlobalContextGLX() : nsnull;
nsRefPtr<GLContextGLX> glContext = GLContextGLX::CreateGLContext(aFormat,
display,
glxpixmap,
cfgs[chosenIndex],
vinfo,
shareContext,
PR_TRUE,
xsurface);
return glContext.forget();
}
bool
GLContextGLX::FindFBConfigForWindow(Display* display, int screen, Window window,
ScopedXFree<GLXFBConfig>* const out_scopedConfigArr,
GLXFBConfig* const out_config, int* const out_visid)
{
ScopedXFree<GLXFBConfig>& cfgs = *out_scopedConfigArr;
int numConfigs;
if (sGLXLibrary.IsATI() ||
!sGLXLibrary.GLXVersionCheck(1, 3)) {
const int attribs[] = {
LOCAL_GLX_DOUBLEBUFFER, False,
0
};
cfgs = sGLXLibrary.xChooseFBConfig(display,
screen,
attribs,
&numConfigs);
} else {
cfgs = sGLXLibrary.xGetFBConfigs(display,
screen,
&numConfigs);
}
if (!cfgs) {
NS_WARNING("[GLX] glXGetFBConfigs() failed");
return false;
}
NS_ASSERTION(numConfigs > 0, "No FBConfigs found!");
// XXX the visual ID is almost certainly the LOCAL_GLX_FBCONFIG_ID, so
// we could probably do this first and replace the glXGetFBConfigs
// with glXChooseConfigs. Docs are sparklingly clear as always.
XWindowAttributes windowAttrs;
if (!XGetWindowAttributes(display, window, &windowAttrs)) {
NS_WARNING("[GLX] XGetWindowAttributes() failed");
return false;
}
const VisualID windowVisualID = XVisualIDFromVisual(windowAttrs.visual);
#ifdef DEBUG
printf("[GLX] window %lx has VisualID 0x%lx\n", window, windowVisualID);
#endif
for (int i = 0; i < numConfigs; i++) {
int visid = None;
sGLXLibrary.xGetFBConfigAttrib(display, cfgs[i], LOCAL_GLX_VISUAL_ID, &visid);
if (!visid) {
continue;
}
if (sGLXLibrary.IsATI()) {
int depth;
Visual* visual;
FindVisualAndDepth(display, visid, &visual, &depth);
if (depth == windowAttrs.depth &&
AreCompatibleVisuals(windowAttrs.visual, visual)) {
*out_config = cfgs[i];
*out_visid = visid;
return true;
}
} else {
if (windowVisualID == static_cast<VisualID>(visid)) {
*out_config = cfgs[i];
*out_visid = visid;
return true;
}
}
}
NS_WARNING("[GLX] Couldn't find a FBConfig matching window visual");
return false;
}
static already_AddRefed<GLContextGLX>
CreateGLContext(const ContextFormat& format,
Display *display,
GLXDrawable drawable,
GLXFBConfig cfg,
XVisualInfo *vinfo,
GLContextGLX *shareContext,
PRBool deleteDrawable,
gfxXlibSurface *pixmap = nsnull)
{
int db = 0, err;
err = sGLXLibrary.xGetFBConfigAttrib(display, cfg,
GLX_DOUBLEBUFFER, &db);
if (GLX_BAD_ATTRIBUTE != err) {
#ifdef DEBUG
printf("[GLX] FBConfig is %sdouble-buffered\n", db ? "" : "not ");
#endif
}
ctxErrorOccurred = false;
int (*oldHandler)(Display *, XErrorEvent *);
GLXContext context;
TRY_AGAIN_NO_SHARING:
oldHandler = XSetErrorHandler(&ctxErrorHandler);
if (gGLXVersion >= 0x0103) {
context = sGLXLibrary.xCreateNewContext(display,
cfg,
GLX_RGBA_TYPE,
shareContext ? shareContext->mContext : NULL,
True);
} else {
context = sGLXLibrary.xCreateContext(display,
vinfo,
shareContext ? shareContext->mContext : NULL,
True);
}
XSync(display, False);
XSetErrorHandler(oldHandler);
if (!context || ctxErrorOccurred) {
if (shareContext) {
shareContext = nsnull;
goto TRY_AGAIN_NO_SHARING;
}
NS_WARNING("Failed to create GLXContext!");
return nsnull;
}
nsRefPtr<GLContextGLX> glContext(new GLContextGLX(format,
shareContext,
display,
drawable,
context,
deleteDrawable,
db,
pixmap));
if (!glContext->Init()) {
return nsnull;
}
return glContext.forget();
}