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3d822b4eda
gecko-dev/gfx/gl/GLContextProviderGLX.cpp
Dzmitry Malyshau 3d822b4eda Bug 1652972 - Mark EGL context as lost on Shutdown() r=aosmond 
This is meant to save us in cases where the message loop in GPU process
receives commands related to resources that point to the old EGL context
that was just shut down. Since the symbols are erased, we'd end up with
trying to execute a nullptr on `MakeCurrent()`. With marking the context
as lost, however, no symbols will be accessed.

Differential Revision: https://phabricator.services.mozilla.com/D84868
2020-07-29 02:33:54 +00:00

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifdef MOZ_WIDGET_GTK
# include <gdk/gdk.h>
# include <gdk/gdkx.h>
# define GET_NATIVE_WINDOW(aWidget) \
GDK_WINDOW_XID((GdkWindow*)aWidget->GetNativeData(NS_NATIVE_WINDOW))
#endif
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "X11UndefineNone.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/layers/CompositorOptions.h"
#include "mozilla/Range.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/widget/CompositorWidget.h"
#include "mozilla/widget/GtkCompositorWidget.h"
#include "mozilla/Unused.h"
#include "prenv.h"
#include "GLContextProvider.h"
#include "GLLibraryLoader.h"
#include "nsDebug.h"
#include "nsIWidget.h"
#include "GLXLibrary.h"
#include "gfxXlibSurface.h"
#include "gfxContext.h"
#include "gfxEnv.h"
#include "gfxPlatform.h"
#include "GLContextGLX.h"
#include "gfxUtils.h"
#include "gfx2DGlue.h"
#include "GLScreenBuffer.h"
#include "gfxCrashReporterUtils.h"
#ifdef MOZ_WIDGET_GTK
# include "gfxPlatformGtk.h"
#endif
namespace mozilla::gl {
using namespace mozilla::gfx;
using namespace mozilla::widget;
GLXLibrary sGLXLibrary;
static inline bool HasExtension(const char* aExtensions,
const char* aRequiredExtension) {
return GLContext::ListHasExtension(
reinterpret_cast<const GLubyte*>(aExtensions), aRequiredExtension);
}
bool GLXLibrary::EnsureInitialized() {
if (mInitialized) {
return true;
}
// Don't repeatedly try to initialize.
if (mTriedInitializing) {
return false;
}
mTriedInitializing = true;
// Force enabling s3 texture compression. (Bug 774134)
PR_SetEnv("force_s3tc_enable=true");
if (!mOGLLibrary) {
// see e.g. bug 608526: it is intrinsically interesting to know whether we
// have dynamically linked to libGL.so.1 because at least the NVIDIA
// implementation requires an executable stack, which causes mprotect calls,
// which trigger glibc bug
// http://sourceware.org/bugzilla/show_bug.cgi?id=12225
const char* libGLfilename = "libGL.so.1";
#if defined(__OpenBSD__) || defined(__NetBSD__)
libGLfilename = "libGL.so";
#endif
const bool forceFeatureReport = false;
ScopedGfxFeatureReporter reporter(libGLfilename, forceFeatureReport);
mOGLLibrary = PR_LoadLibrary(libGLfilename);
if (!mOGLLibrary) {
NS_WARNING("Couldn't load OpenGL shared library.");
return false;
}
reporter.SetSuccessful();
}
if (gfxEnv::GlxDebug()) {
mDebug = true;
}
#define SYMBOL(X) \
{ \
(PRFuncPtr*)&mSymbols.f##X, { \
{ "glX" #X } \
} \
}
#define END_OF_SYMBOLS \
{ \
nullptr, {} \
}
const SymLoadStruct symbols[] = {
/* functions that were in GLX 1.0 */
SYMBOL(DestroyContext),
SYMBOL(MakeCurrent),
SYMBOL(SwapBuffers),
SYMBOL(QueryVersion),
SYMBOL(GetConfig),
SYMBOL(GetCurrentContext),
SYMBOL(WaitGL),
SYMBOL(WaitX),
/* functions introduced in GLX 1.1 */
SYMBOL(QueryExtensionsString),
SYMBOL(GetClientString),
SYMBOL(QueryServerString),
/* functions introduced in GLX 1.3 */
SYMBOL(ChooseFBConfig),
SYMBOL(ChooseVisual),
SYMBOL(GetFBConfigAttrib),
SYMBOL(GetFBConfigs),
SYMBOL(CreatePixmap),
SYMBOL(DestroyPixmap),
SYMBOL(CreateNewContext),
// Core in GLX 1.4, ARB extension before.
{(PRFuncPtr*)&mSymbols.fGetProcAddress,
{{"glXGetProcAddress", "glXGetProcAddressARB"}}},
END_OF_SYMBOLS};
{
const SymbolLoader libLoader(*mOGLLibrary);
if (!libLoader.LoadSymbols(symbols)) {
NS_WARNING("Couldn't load required GLX symbols.");
return false;
}
}
const SymbolLoader pfnLoader(mSymbols.fGetProcAddress);
Display* display = DefaultXDisplay();
int screen = DefaultScreen(display);
{
int major, minor;
if (!fQueryVersion(display, &major, &minor) || major != 1 || minor < 3) {
NS_ERROR("GLX version older than 1.3. (released in 1998)");
return false;
}
}
const SymLoadStruct symbols_texturefrompixmap[] = {
SYMBOL(BindTexImageEXT), SYMBOL(ReleaseTexImageEXT), END_OF_SYMBOLS};
const SymLoadStruct symbols_createcontext[] = {
SYMBOL(CreateContextAttribsARB), END_OF_SYMBOLS};
const SymLoadStruct symbols_videosync[] = {
SYMBOL(GetVideoSyncSGI), SYMBOL(WaitVideoSyncSGI), END_OF_SYMBOLS};
const SymLoadStruct symbols_swapcontrol[] = {SYMBOL(SwapIntervalEXT),
END_OF_SYMBOLS};
const SymLoadStruct symbols_copysubbuffer[] = {SYMBOL(CopySubBufferMESA),
END_OF_SYMBOLS};
const auto fnLoadSymbols = [&](const SymLoadStruct* symbols) {
if (pfnLoader.LoadSymbols(symbols)) return true;
ClearSymbols(symbols);
return false;
};
const char* clientVendor = fGetClientString(display, LOCAL_GLX_VENDOR);
const char* serverVendor =
fQueryServerString(display, screen, LOCAL_GLX_VENDOR);
const char* extensionsStr = fQueryExtensionsString(display, screen);
if (HasExtension(extensionsStr, "GLX_EXT_texture_from_pixmap") &&
fnLoadSymbols(symbols_texturefrompixmap)) {
mUseTextureFromPixmap = StaticPrefs::gfx_use_glx_texture_from_pixmap();
} else {
mUseTextureFromPixmap = false;
NS_WARNING("Texture from pixmap disabled");
}
if (HasExtension(extensionsStr, "GLX_ARB_create_context") &&
HasExtension(extensionsStr, "GLX_ARB_create_context_profile") &&
fnLoadSymbols(symbols_createcontext)) {
mHasCreateContextAttribs = true;
}
if (HasExtension(extensionsStr, "GLX_ARB_create_context_robustness")) {
mHasRobustness = true;
}
if (HasExtension(extensionsStr, "GLX_NV_robustness_video_memory_purge")) {
mHasVideoMemoryPurge = true;
}
if (HasExtension(extensionsStr, "GLX_SGI_video_sync") &&
fnLoadSymbols(symbols_videosync)) {
mHasVideoSync = true;
}
if (!HasExtension(extensionsStr, "GLX_EXT_swap_control") ||
!fnLoadSymbols(symbols_swapcontrol)) {
NS_WARNING(
"GLX_swap_control unsupported, ASAP mode may still block on buffer "
"swaps.");
}
if (HasExtension(extensionsStr, "GLX_MESA_copy_sub_buffer") &&
fnLoadSymbols(symbols_copysubbuffer)) {
mHasCopySubBuffer = true;
}
mIsATI = serverVendor && DoesStringMatch(serverVendor, "ATI");
mIsNVIDIA =
serverVendor && DoesStringMatch(serverVendor, "NVIDIA Corporation");
mClientIsMesa = clientVendor && DoesStringMatch(clientVendor, "Mesa");
mInitialized = true;
return true;
}
bool GLXLibrary::SupportsTextureFromPixmap(gfxASurface* aSurface) {
if (!EnsureInitialized()) {
return false;
}
if (aSurface->GetType() != gfxSurfaceType::Xlib || !mUseTextureFromPixmap) {
return false;
}
return true;
}
bool GLXLibrary::SupportsVideoSync() {
if (!EnsureInitialized()) {
return false;
}
return mHasVideoSync;
}
GLXPixmap GLXLibrary::CreatePixmap(gfxASurface* aSurface) {
if (!SupportsTextureFromPixmap(aSurface)) {
return X11None;
}
gfxXlibSurface* xs = static_cast<gfxXlibSurface*>(aSurface);
const XRenderPictFormat* format = xs->XRenderFormat();
if (!format || format->type != PictTypeDirect) {
return X11None;
}
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,
X11False,
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),
X11True,
LOCAL_GLX_RENDER_TYPE,
LOCAL_GLX_RGBA_BIT,
X11None};
int numConfigs = 0;
Display* display = xs->XDisplay();
int xscreen = DefaultScreen(display);
ScopedXFree<GLXFBConfig> cfgs(
fChooseFBConfig(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 = X11None;
sGLXLibrary.fGetFBConfigAttrib(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.fGetFBConfigAttrib(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_WARNING_ASSERTION(
format->depth == 8,
"[GLX] Couldn't find a FBConfig matching Pixmap format");
return X11None;
}
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),
X11None};
GLXPixmap glxpixmap =
fCreatePixmap(display, cfgs[matchIndex], xs->XDrawable(), pixmapAttribs);
return glxpixmap;
}
void GLXLibrary::DestroyPixmap(Display* aDisplay, GLXPixmap aPixmap) {
if (!mUseTextureFromPixmap) {
return;
}
fDestroyPixmap(aDisplay, aPixmap);
}
void GLXLibrary::BindTexImage(Display* aDisplay, GLXPixmap aPixmap) {
if (!mUseTextureFromPixmap) {
return;
}
// Make sure all X drawing to the surface has finished before binding to a
// texture.
if (mClientIsMesa) {
// Using XSync instead of Mesa's glXWaitX, because its glxWaitX is a
// noop when direct rendering unless the current drawable is a
// single-buffer window.
FinishX(aDisplay);
} else {
fWaitX();
}
fBindTexImage(aDisplay, aPixmap, LOCAL_GLX_FRONT_LEFT_EXT, nullptr);
}
void GLXLibrary::ReleaseTexImage(Display* aDisplay, GLXPixmap aPixmap) {
if (!mUseTextureFromPixmap) {
return;
}
fReleaseTexImage(aDisplay, aPixmap, LOCAL_GLX_FRONT_LEFT_EXT);
}
void GLXLibrary::UpdateTexImage(Display* aDisplay, GLXPixmap aPixmap) {
// NVIDIA drivers don't require a rebind of the pixmap in order
// to display an updated image, and it's faster not to do it.
if (mIsNVIDIA) {
fWaitX();
return;
}
ReleaseTexImage(aDisplay, aPixmap);
BindTexImage(aDisplay, aPixmap);
}
static int (*sOldErrorHandler)(Display*, XErrorEvent*);
ScopedXErrorHandler::ErrorEvent sErrorEvent;
static int GLXErrorHandler(Display* display, XErrorEvent* ev) {
if (!sErrorEvent.mError.error_code) {
sErrorEvent.mError = *ev;
}
return 0;
}
void GLXLibrary::BeforeGLXCall() const {
if (mDebug) {
sOldErrorHandler = XSetErrorHandler(GLXErrorHandler);
}
}
void GLXLibrary::AfterGLXCall() const {
if (mDebug) {
FinishX(DefaultXDisplay());
if (sErrorEvent.mError.error_code) {
char buffer[2048];
XGetErrorText(DefaultXDisplay(), sErrorEvent.mError.error_code, buffer,
sizeof(buffer));
printf_stderr("X ERROR: %s (%i) - Request: %i.%i, Serial: %lu", buffer,
sErrorEvent.mError.error_code,
sErrorEvent.mError.request_code,
sErrorEvent.mError.minor_code, sErrorEvent.mError.serial);
MOZ_ASSERT_UNREACHABLE("AfterGLXCall sErrorEvent");
}
XSetErrorHandler(sOldErrorHandler);
}
}
already_AddRefed<GLContextGLX> GLContextGLX::CreateGLContext(
const GLContextDesc& desc, Display* display, GLXDrawable drawable,
GLXFBConfig cfg, bool deleteDrawable, gfxXlibSurface* pixmap) {
GLXLibrary& glx = sGLXLibrary;
int db = 0;
int err = glx.fGetFBConfigAttrib(display, cfg, LOCAL_GLX_DOUBLEBUFFER, &db);
if (LOCAL_GLX_BAD_ATTRIBUTE != err) {
if (ShouldSpew()) {
printf("[GLX] FBConfig is %sdouble-buffered\n", db ? "" : "not ");
}
}
GLXContext context;
RefPtr<GLContextGLX> glContext;
bool error;
OffMainThreadScopedXErrorHandler xErrorHandler;
do {
error = false;
if (glx.HasCreateContextAttribs()) {
AutoTArray<int, 13> attrib_list;
if (glx.HasRobustness()) {
const int robust_attribs[] = {
LOCAL_GLX_CONTEXT_FLAGS_ARB,
LOCAL_GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB,
LOCAL_GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
LOCAL_GLX_LOSE_CONTEXT_ON_RESET_ARB,
};
attrib_list.AppendElements(robust_attribs,
MOZ_ARRAY_LENGTH(robust_attribs));
}
if (glx.HasVideoMemoryPurge()) {
const int memory_purge_attribs[] = {
LOCAL_GLX_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV,
LOCAL_GL_TRUE,
};
attrib_list.AppendElements(memory_purge_attribs,
MOZ_ARRAY_LENGTH(memory_purge_attribs));
}
if (!(desc.flags & CreateContextFlags::REQUIRE_COMPAT_PROFILE)) {
int core_attribs[] = {
LOCAL_GLX_CONTEXT_MAJOR_VERSION_ARB,
3,
LOCAL_GLX_CONTEXT_MINOR_VERSION_ARB,
2,
LOCAL_GLX_CONTEXT_PROFILE_MASK_ARB,
LOCAL_GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
};
attrib_list.AppendElements(core_attribs,
MOZ_ARRAY_LENGTH(core_attribs));
};
attrib_list.AppendElement(0);
context = glx.fCreateContextAttribs(display, cfg, nullptr, X11True,
attrib_list.Elements());
} else {
context = glx.fCreateNewContext(display, cfg, LOCAL_GLX_RGBA_TYPE,
nullptr, X11True);
}
if (context) {
glContext = new GLContextGLX(desc, display, drawable, context,
deleteDrawable, db, pixmap);
if (!glContext->Init()) error = true;
} else {
error = true;
}
error |= xErrorHandler.SyncAndGetError(display);
if (error) {
NS_WARNING("Failed to create GLXContext!");
glContext = nullptr; // note: this must be done while the graceful X
// error handler is set, because glxMakeCurrent can
// give a GLXBadDrawable error
}
return glContext.forget();
} while (true);
}
GLContextGLX::~GLContextGLX() {
MarkDestroyed();
// Wrapped context should not destroy glxContext/Surface
if (!mOwnsContext) {
return;
}
// see bug 659842 comment 76
#ifdef DEBUG
bool success =
#endif
mGLX->fMakeCurrent(mDisplay, X11None, nullptr);
MOZ_ASSERT(success,
"glXMakeCurrent failed to release GL context before we call "
"glXDestroyContext!");
mGLX->fDestroyContext(mDisplay, mContext);
if (mDeleteDrawable) {
mGLX->fDestroyPixmap(mDisplay, mDrawable);
}
}
bool GLContextGLX::Init() {
if (!GLContext::Init()) {
return false;
}
// EXT_framebuffer_object is not supported on Core contexts
// so we'll also check for ARB_framebuffer_object
if (!IsExtensionSupported(EXT_framebuffer_object) &&
!IsSupported(GLFeature::framebuffer_object))
return false;
return true;
}
bool GLContextGLX::IsAliveImpl() const { return true; }
bool GLContextGLX::MakeCurrentImpl() const {
if (mGLX->IsMesa()) {
// Read into the event queue to ensure that Mesa receives a
// DRI2InvalidateBuffers event before drawing. See bug 1280653.
Unused << XPending(mDisplay);
}
const bool succeeded = mGLX->fMakeCurrent(mDisplay, mDrawable, mContext);
NS_ASSERTION(succeeded, "Failed to make GL context current!");
if (!IsOffscreen() && mGLX->SupportsSwapControl()) {
// Many GLX implementations default to blocking until the next
// VBlank when calling glXSwapBuffers. We want to run unthrottled
// in ASAP mode. See bug 1280744.
const bool isASAP = (StaticPrefs::layout_frame_rate() == 0);
mGLX->fSwapInterval(mDisplay, mDrawable, isASAP ? 0 : 1);
}
return succeeded;
}
bool GLContextGLX::IsCurrentImpl() const {
return mGLX->fGetCurrentContext() == mContext;
}
Maybe<SymbolLoader> GLContextGLX::GetSymbolLoader() const {
const auto pfn = sGLXLibrary.GetGetProcAddress();
return Some(SymbolLoader(pfn));
}
bool GLContextGLX::IsDoubleBuffered() const { return mDoubleBuffered; }
bool GLContextGLX::SwapBuffers() {
if (!mDoubleBuffered) return false;
mGLX->fSwapBuffers(mDisplay, mDrawable);
return true;
}
bool GLContextGLX::HasCopySubBuffer() const {
return mDoubleBuffered && mGLX->HasCopySubBuffer();
}
void GLContextGLX::CopySubBuffer(int x, int y, int w, int h) {
MOZ_ASSERT(HasCopySubBuffer());
mGLX->fCopySubBufferMESA(mDisplay, mDrawable, x, y, w, h);
}
void GLContextGLX::GetWSIInfo(nsCString* const out) const {
Display* display = DefaultXDisplay();
int screen = DefaultScreen(display);
int majorVersion, minorVersion;
sGLXLibrary.fQueryVersion(display, &majorVersion, &minorVersion);
out->Append(nsPrintfCString("GLX %u.%u", majorVersion, minorVersion));
out->AppendLiteral("\nGLX_VENDOR(client): ");
out->Append(sGLXLibrary.fGetClientString(display, LOCAL_GLX_VENDOR));
out->AppendLiteral("\nGLX_VENDOR(server): ");
out->Append(
sGLXLibrary.fQueryServerString(display, screen, LOCAL_GLX_VENDOR));
out->AppendLiteral("\nExtensions: ");
out->Append(sGLXLibrary.fQueryExtensionsString(display, screen));
}
bool GLContextGLX::OverrideDrawable(GLXDrawable drawable) {
return mGLX->fMakeCurrent(mDisplay, drawable, mContext);
}
bool GLContextGLX::RestoreDrawable() {
return mGLX->fMakeCurrent(mDisplay, mDrawable, mContext);
}
GLContextGLX::GLContextGLX(const GLContextDesc& desc, Display* aDisplay,
GLXDrawable aDrawable, GLXContext aContext,
bool aDeleteDrawable, bool aDoubleBuffered,
gfxXlibSurface* aPixmap)
: GLContext(desc, nullptr),
mContext(aContext),
mDisplay(aDisplay),
mDrawable(aDrawable),
mDeleteDrawable(aDeleteDrawable),
mDoubleBuffered(aDoubleBuffered),
mGLX(&sGLXLibrary),
mPixmap(aPixmap) {}
static bool AreCompatibleVisuals(Visual* one, Visual* two) {
if (one->c_class != two->c_class) {
return false;
}
if (one->red_mask != two->red_mask || one->green_mask != two->green_mask ||
one->blue_mask != two->blue_mask) {
return false;
}
if (one->bits_per_rgb != two->bits_per_rgb) {
return false;
}
return true;
}
already_AddRefed<GLContext> GLContextProviderGLX::CreateWrappingExisting(
void* aContext, void* aSurface) {
if (!sGLXLibrary.EnsureInitialized()) {
return nullptr;
}
if (aContext && aSurface) {
RefPtr<GLContextGLX> glContext =
new GLContextGLX({},
(Display*)DefaultXDisplay(), // Display
(GLXDrawable)aSurface, (GLXContext)aContext,
false, // aDeleteDrawable,
true, (gfxXlibSurface*)nullptr);
glContext->mOwnsContext = false;
return glContext.forget();
}
return nullptr;
}
already_AddRefed<GLContext> CreateForWidget(Display* aXDisplay, Window aXWindow,
bool aWebRender,
bool aForceAccelerated) {
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.
if (!aXDisplay) {
NS_ERROR("X Display required for GLX Context provider");
return nullptr;
}
int xscreen = DefaultScreen(aXDisplay);
ScopedXFree<GLXFBConfig> cfgs;
GLXFBConfig config;
int visid;
if (!GLContextGLX::FindFBConfigForWindow(aXDisplay, xscreen, aXWindow, &cfgs,
&config, &visid, aWebRender)) {
return nullptr;
}
CreateContextFlags flags;
if (aWebRender) {
flags = CreateContextFlags::NONE; // WR needs GL3.2+
} else {
flags = CreateContextFlags::REQUIRE_COMPAT_PROFILE;
}
return GLContextGLX::CreateGLContext({{flags}, false}, aXDisplay, aXWindow,
config, false, nullptr);
}
already_AddRefed<GLContext> GLContextProviderGLX::CreateForCompositorWidget(
CompositorWidget* aCompositorWidget, bool aWebRender,
bool aForceAccelerated) {
if (!aCompositorWidget) {
MOZ_ASSERT(false);
return nullptr;
}
GtkCompositorWidget* compWidget = aCompositorWidget->AsX11();
MOZ_ASSERT(compWidget);
return CreateForWidget(compWidget->XDisplay(), compWidget->XWindow(),
aWebRender, aForceAccelerated);
}
static bool ChooseConfig(GLXLibrary* glx, Display* display, int screen,
ScopedXFree<GLXFBConfig>* const out_scopedConfigArr,
GLXFBConfig* const out_config, int* const out_visid) {
ScopedXFree<GLXFBConfig>& scopedConfigArr = *out_scopedConfigArr;
int attribs[] = {LOCAL_GLX_DRAWABLE_TYPE,
LOCAL_GLX_PIXMAP_BIT,
LOCAL_GLX_X_RENDERABLE,
X11True,
LOCAL_GLX_RED_SIZE,
8,
LOCAL_GLX_GREEN_SIZE,
8,
LOCAL_GLX_BLUE_SIZE,
8,
LOCAL_GLX_ALPHA_SIZE,
8,
LOCAL_GLX_DEPTH_SIZE,
0,
LOCAL_GLX_STENCIL_SIZE,
0,
0};
int numConfigs = 0;
scopedConfigArr = glx->fChooseFBConfig(display, screen, attribs, &numConfigs);
if (!scopedConfigArr || !numConfigs) return false;
// Issues with glxChooseFBConfig selection and sorting:
// * ALPHA_SIZE is sorted as 'largest total RGBA bits first'. If we don't
// request
// alpha bits, we'll probably get RGBA anyways, since 32 is more than 24.
// * DEPTH_SIZE is sorted largest first, including for `0` inputs.
// * STENCIL_SIZE is smallest first, but it might return `8` even though we
// ask for
// `0`.
// For now, we don't care about these. We *will* care when we do XPixmap
// sharing.
for (int i = 0; i < numConfigs; ++i) {
GLXFBConfig curConfig = scopedConfigArr[i];
int visid;
if (glx->fGetFBConfigAttrib(display, curConfig, LOCAL_GLX_VISUAL_ID,
&visid) != Success) {
continue;
}
if (!visid) continue;
*out_config = curConfig;
*out_visid = visid;
return true;
}
return false;
}
bool GLContextGLX::FindVisual(Display* display, int screen, bool useWebRender,
bool useAlpha, int* const out_visualId) {
if (!sGLXLibrary.EnsureInitialized()) {
return false;
}
XVisualInfo visualTemplate;
visualTemplate.screen = screen;
// Get all visuals of screen
int visualsLen = 0;
XVisualInfo* xVisuals =
XGetVisualInfo(display, VisualScreenMask, &visualTemplate, &visualsLen);
if (!xVisuals) {
return false;
}
const Range<XVisualInfo> visualInfos(xVisuals, visualsLen);
auto cleanupVisuals = MakeScopeExit([&] { XFree(xVisuals); });
// Get default visual info
Visual* defaultVisual = DefaultVisual(display, screen);
const auto defaultVisualInfo = [&]() -> const XVisualInfo* {
for (const auto& cur : visualInfos) {
if (cur.visual == defaultVisual) {
return &cur;
}
}
return nullptr;
}();
if (!defaultVisualInfo) {
MOZ_ASSERT(false);
return false;
}
const int bpp = useAlpha ? 32 : 24;
const int alphaSize = useAlpha ? 8 : 0;
const int depthSize = useWebRender ? 24 : 0;
for (auto& cur : visualInfos) {
const auto fnConfigMatches = [&](const int pname, const int expected) {
int actual;
if (sGLXLibrary.fGetConfig(display, &cur, pname, &actual)) {
return false;
}
return actual == expected;
};
// Check if visual is compatible.
if (cur.depth != bpp || cur.c_class != defaultVisualInfo->c_class) {
continue;
}
// Check if visual is compatible to GL requests.
if (fnConfigMatches(LOCAL_GLX_USE_GL, 1) &&
fnConfigMatches(LOCAL_GLX_DOUBLEBUFFER, 1) &&
fnConfigMatches(LOCAL_GLX_RED_SIZE, 8) &&
fnConfigMatches(LOCAL_GLX_GREEN_SIZE, 8) &&
fnConfigMatches(LOCAL_GLX_BLUE_SIZE, 8) &&
fnConfigMatches(LOCAL_GLX_ALPHA_SIZE, alphaSize) &&
fnConfigMatches(LOCAL_GLX_DEPTH_SIZE, depthSize)) {
*out_visualId = cur.visualid;
return true;
}
}
return false;
}
bool GLContextGLX::FindFBConfigForWindow(
Display* display, int screen, Window window,
ScopedXFree<GLXFBConfig>* const out_scopedConfigArr,
GLXFBConfig* const out_config, int* const out_visid, bool aWebRender) {
// 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;
}
ScopedXFree<GLXFBConfig>& cfgs = *out_scopedConfigArr;
int numConfigs;
const int webrenderAttribs[] = {LOCAL_GLX_ALPHA_SIZE,
windowAttrs.depth == 32 ? 8 : 0,
LOCAL_GLX_DEPTH_SIZE,
24,
LOCAL_GLX_DOUBLEBUFFER,
X11True,
0};
if (aWebRender) {
cfgs = sGLXLibrary.fChooseFBConfig(display, screen, webrenderAttribs,
&numConfigs);
} else {
cfgs = sGLXLibrary.fGetFBConfigs(display, screen, &numConfigs);
}
if (!cfgs) {
NS_WARNING("[GLX] glXGetFBConfigs() failed");
return false;
}
NS_ASSERTION(numConfigs > 0, "No FBConfigs found!");
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 = X11None;
sGLXLibrary.fGetFBConfigAttrib(display, cfgs[i], LOCAL_GLX_VISUAL_ID,
&visid);
if (visid) {
// WebRender compatible GLX visual is configured
// at nsWindow::Create() by GLContextGLX::FindVisual(),
// just reuse it here.
if (windowVisualID == static_cast<VisualID>(visid)) {
*out_config = cfgs[i];
*out_visid = visid;
return true;
}
}
}
// We don't have a frame buffer visual which matches the GLX visual
// from GLContextGLX::FindVisual(). Let's try to find a near one and hope
// we're not on NVIDIA (Bug 1478454) as it causes X11 BadMatch error there.
for (int i = 0; i < numConfigs; i++) {
int visid = X11None;
sGLXLibrary.fGetFBConfigAttrib(display, cfgs[i], LOCAL_GLX_VISUAL_ID,
&visid);
if (visid) {
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;
}
}
}
NS_WARNING("[GLX] Couldn't find a FBConfig matching window visual");
return false;
}
static already_AddRefed<GLContextGLX> CreateOffscreenPixmapContext(
const GLContextCreateDesc& desc, const IntSize& size,
nsACString* const out_failureId) {
GLXLibrary* glx = &sGLXLibrary;
if (!glx->EnsureInitialized()) return nullptr;
Display* display = DefaultXDisplay();
int screen = DefaultScreen(display);
ScopedXFree<GLXFBConfig> scopedConfigArr;
GLXFBConfig config;
int visid;
if (!ChooseConfig(glx, display, screen, &scopedConfigArr, &config, &visid)) {
NS_WARNING("Failed to find a compatible config.");
return nullptr;
}
Visual* visual;
int depth;
FindVisualAndDepth(display, visid, &visual, &depth);
OffMainThreadScopedXErrorHandler xErrorHandler;
bool error = false;
gfx::IntSize dummySize(16, 16);
RefPtr<gfxXlibSurface> surface = gfxXlibSurface::Create(
DefaultScreenOfDisplay(display), visual, dummySize);
if (surface->CairoStatus() != 0) {
mozilla::Unused << xErrorHandler.SyncAndGetError(display);
return nullptr;
}
// Handle slightly different signature between glXCreatePixmap and
// its pre-GLX-1.3 extension equivalent (though given the ABI, we
// might not need to).
const auto drawable = surface->XDrawable();
const auto pixmap = glx->fCreatePixmap(display, config, drawable, nullptr);
if (pixmap == 0) {
error = true;
}
bool serverError = xErrorHandler.SyncAndGetError(display);
if (error || serverError) return nullptr;
auto fullDesc = GLContextDesc{desc};
fullDesc.isOffscreen = true;
return GLContextGLX::CreateGLContext(fullDesc, display, pixmap, config, true,
surface);
}
/*static*/
already_AddRefed<GLContext> GLContextProviderGLX::CreateHeadless(
const GLContextCreateDesc& desc, nsACString* const out_failureId) {
IntSize dummySize = IntSize(16, 16);
return CreateOffscreenPixmapContext(desc, dummySize, out_failureId);
}
/*static*/
GLContext* GLContextProviderGLX::GetGlobalContext() {
// Context sharing not supported.
return nullptr;
}
/*static*/
void GLContextProviderGLX::Shutdown() {}
} // namespace mozilla::gl
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