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kwin/compositingprefs.cpp
Philipp Knechtges cd585972ae kwin: avoid SEGFAULT in case of egl_glx 
The mesa egl_glx egl driver only provides indirect rendering which is
insufficient for GLES2.
2011-12-01 22:45:10 +01:00

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "compositingprefs.h"
#include "kwinglobals.h"
#include "kwinglplatform.h"
#include <kconfiggroup.h>
#include <kdebug.h>
#include <kxerrorhandler.h>
#include <klocale.h>
#include <kdeversion.h>
#include <ksharedconfig.h>
#include <kstandarddirs.h>
#include <qprocess.h>
namespace KWin
{
CompositingPrefs::CompositingPrefs()
: mRecommendCompositing(false)
, mEnableVSync(true)
, mEnableDirectRendering(true)
, mStrictBinding(true)
{
}
CompositingPrefs::~CompositingPrefs()
{
}
bool CompositingPrefs::recommendCompositing() const
{
return mRecommendCompositing;
}
bool CompositingPrefs::openGlIsBroken()
{
KSharedConfigPtr config = KSharedConfig::openConfig("kwinrc");
return KConfigGroup(config, "Compositing").readEntry("OpenGLIsUnsafe", false);
}
bool CompositingPrefs::compositingPossible()
{
// first off, check whether we figured that we'll crash on detection because of a buggy driver
KSharedConfigPtr config = KSharedConfig::openConfig("kwinrc");
KConfigGroup gl_workaround_group(config, "Compositing");
if (gl_workaround_group.readEntry("Backend", "OpenGL") == "OpenGL" &&
gl_workaround_group.readEntry("OpenGLIsUnsafe", false))
return false;
Extensions::init();
if (!Extensions::compositeAvailable()) {
kDebug(1212) << "No composite extension available";
return false;
}
if (!Extensions::damageAvailable()) {
kDebug(1212) << "No damage extension available";
return false;
}
if (hasGlx())
return true;
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (Extensions::renderAvailable() && Extensions::fixesAvailable())
return true;
#endif
#ifdef KWIN_HAVE_OPENGLES
return true;
#endif
kDebug(1212) << "No OpenGL or XRender/XFixes support";
return false;
}
QString CompositingPrefs::compositingNotPossibleReason()
{
// first off, check whether we figured that we'll crash on detection because of a buggy driver
KSharedConfigPtr config = KSharedConfig::openConfig("kwinrc");
KConfigGroup gl_workaround_group(config, "Compositing");
if (gl_workaround_group.readEntry("Backend", "OpenGL") == "OpenGL" &&
gl_workaround_group.readEntry("OpenGLIsUnsafe", false))
return i18n("<b>OpenGL compositing (the default) has crashed KWin in the past.</b><br>"
"This was most likely due to a driver bug."
"<p>If you think that you have meanwhile upgraded to a stable driver,<br>"
"you can reset this protection but <b>be aware that this might result in an immediate crash!</b></p>"
"<p>Alternatively, you might want to use the XRender backend instead.</p>");
Extensions::init();
if (!Extensions::compositeAvailable() || !Extensions::damageAvailable()) {
return i18n("Required X extensions (XComposite and XDamage) are not available.");
}
#if !defined( KWIN_HAVE_XRENDER_COMPOSITING )
if (!hasGlx())
return i18n("GLX/OpenGL are not available and only OpenGL support is compiled.");
#else
if (!(hasGlx()
|| (Extensions::renderAvailable() && Extensions::fixesAvailable()))) {
return i18n("GLX/OpenGL and XRender/XFixes are not available.");
}
#endif
return QString();
}
static bool s_glxDetected = false;
static bool s_hasGlx = false;
bool CompositingPrefs::hasGlx()
{
if (s_glxDetected) {
return s_hasGlx;
}
#ifndef KWIN_HAVE_OPENGLES
int event_base, error_base;
s_hasGlx = glXQueryExtension(display(), &event_base, &error_base);
#endif
s_glxDetected = true;
return s_hasGlx;
}
void CompositingPrefs::detect()
{
if (!compositingPossible() || openGlIsBroken()) {
return;
}
// NOTICE: this is intended to workaround broken GL implementations that successfully segfault
// on glXQuery :-(
// we tag GL as unsafe. It *must* be reset before every return, and in case we "unexpectedly"
// end (aka "segfaulted") we know that we shall not try again
KSharedConfigPtr config = KSharedConfig::openConfig("kwinrc");
KConfigGroup gl_workaround_config = KConfigGroup(config, "Compositing");
gl_workaround_config.writeEntry("OpenGLIsUnsafe", true);
gl_workaround_config.sync();
#ifdef KWIN_HAVE_OPENGLES
bool haveContext = false;
bool canDetect = false;
EGLDisplay dpy = eglGetCurrentDisplay();
if (dpy != EGL_NO_DISPLAY) {
EGLContext ctx = eglGetCurrentContext();
if (ctx != EGL_NO_CONTEXT) {
haveContext = true;
canDetect = true;
}
}
if (!haveContext) {
canDetect = initEGLContext();
}
if (canDetect) {
detectDriverAndVersion();
applyDriverSpecificOptions();
}
if (!haveContext) {
deleteEGLContext();
}
#else
// HACK: This is needed for AIGLX
const bool forceIndirect = qstrcmp(qgetenv("LIBGL_ALWAYS_INDIRECT"), "1") == 0;
if (!forceIndirect && qstrcmp(qgetenv("KWIN_DIRECT_GL"), "1") != 0) {
// Start an external helper program that initializes GLX and returns
// 0 if we can use direct rendering, and 1 otherwise.
// The reason we have to use an external program is that after GLX
// has been initialized, it's too late to set the LIBGL_ALWAYS_INDIRECT
// environment variable.
// Direct rendering is preferred, since not all OpenGL extensions are
// available with indirect rendering.
const QString opengl_test = KStandardDirs::findExe("kwin_opengl_test");
if (QProcess::execute(opengl_test) != 0) {
mEnableDirectRendering = false;
setenv("LIBGL_ALWAYS_INDIRECT", "1", true);
} else {
mEnableDirectRendering = true;
}
} else {
mEnableDirectRendering = !forceIndirect;
}
if (!hasGlx()) {
kDebug(1212) << "No GLX available";
gl_workaround_config.writeEntry("OpenGLIsUnsafe", false);
gl_workaround_config.sync();
return;
}
int glxmajor, glxminor;
glXQueryVersion(display(), &glxmajor, &glxminor);
kDebug(1212) << "glx version is " << glxmajor << "." << glxminor;
bool hasglx13 = (glxmajor > 1 || (glxmajor == 1 && glxminor >= 3));
// remember and later restore active context
GLXContext oldcontext = glXGetCurrentContext();
GLXDrawable olddrawable = glXGetCurrentDrawable();
GLXDrawable oldreaddrawable = None;
if (hasglx13)
oldreaddrawable = glXGetCurrentReadDrawable();
if (initGLXContext()) {
detectDriverAndVersion();
applyDriverSpecificOptions();
}
if (hasglx13)
glXMakeContextCurrent(display(), olddrawable, oldreaddrawable, oldcontext);
else
glXMakeCurrent(display(), olddrawable, oldcontext);
deleteGLXContext();
#endif
gl_workaround_config.writeEntry("OpenGLIsUnsafe", false);
gl_workaround_config.sync();
}
bool CompositingPrefs::initGLXContext()
{
#ifndef KWIN_HAVE_OPENGLES
mGLContext = NULL;
KXErrorHandler handler;
// Most of this code has been taken from glxinfo.c
QVector<int> attribs;
attribs << GLX_RGBA;
attribs << GLX_RED_SIZE << 1;
attribs << GLX_GREEN_SIZE << 1;
attribs << GLX_BLUE_SIZE << 1;
attribs << None;
XVisualInfo* visinfo = glXChooseVisual(display(), DefaultScreen(display()), attribs.data());
if (!visinfo) {
attribs.last() = GLX_DOUBLEBUFFER;
attribs << None;
visinfo = glXChooseVisual(display(), DefaultScreen(display()), attribs.data());
if (!visinfo) {
kDebug(1212) << "Error: couldn't find RGB GLX visual";
return false;
}
}
mGLContext = glXCreateContext(display(), visinfo, NULL, True);
if (!mGLContext) {
kDebug(1212) << "glXCreateContext failed";
XDestroyWindow(display(), mGLWindow);
return false;
}
XSetWindowAttributes attr;
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap(display(), rootWindow(), visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask;
unsigned long mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
int width = 100, height = 100;
mGLWindow = XCreateWindow(display(), rootWindow(), 0, 0, width, height,
0, visinfo->depth, InputOutput,
visinfo->visual, mask, &attr);
return glXMakeCurrent(display(), mGLWindow, mGLContext) && !handler.error(true);
#else
return false;
#endif
}
void CompositingPrefs::deleteGLXContext()
{
#ifndef KWIN_HAVE_OPENGLES
if (mGLContext == NULL)
return;
glXDestroyContext(display(), mGLContext);
XDestroyWindow(display(), mGLWindow);
#endif
}
bool CompositingPrefs::initEGLContext()
{
#ifdef KWIN_HAVE_OPENGLES
mEGLDisplay = eglGetDisplay(display());
if (mEGLDisplay == EGL_NO_DISPLAY) {
return false;
}
if (eglInitialize(mEGLDisplay, 0, 0) == EGL_FALSE) {
return false;
}
eglBindAPI(EGL_OPENGL_ES_API);
const EGLint config_attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, 0,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_CONFIG_CAVEAT, EGL_NONE,
EGL_NONE,
};
EGLint count;
EGLConfig configs[1024];
eglChooseConfig(mEGLDisplay, config_attribs, configs, 1024, &count);
if (count == 0) {
// egl_glx only supports indirect rendering, which itself does not allow GLES2
kWarning(1212) << "You might be using mesa egl_glx, which is not supported!";
return false;
}
EGLint visualId = XVisualIDFromVisual((Visual*)QX11Info::appVisual());
EGLConfig config = configs[0];
for (int i = 0; i < count; i++) {
EGLint val;
eglGetConfigAttrib(mEGLDisplay, configs[i], EGL_NATIVE_VISUAL_ID, &val);
if (visualId == val) {
config = configs[i];
break;
}
}
XSetWindowAttributes attr;
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap(display(), rootWindow(), (Visual*)QX11Info::appVisual(), AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask;
unsigned long mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
int width = 100, height = 100;
mGLWindow = XCreateWindow(display(), rootWindow(), 0, 0, width, height,
0, QX11Info::appDepth(), InputOutput,
(Visual*)QX11Info::appVisual(), mask, &attr);
mEGLSurface = eglCreateWindowSurface(mEGLDisplay, config, mGLWindow, 0);
const EGLint context_attribs[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
mEGLContext = eglCreateContext(mEGLDisplay, config, EGL_NO_CONTEXT, context_attribs);
if (mEGLContext == EGL_NO_CONTEXT) {
return false;
}
if (eglMakeCurrent(mEGLDisplay, mEGLSurface, mEGLSurface, mEGLContext) == EGL_FALSE) {
return false;
}
EGLint error = eglGetError();
if (error != EGL_SUCCESS) {
return false;
}
return true;
#else
return false;
#endif
}
void CompositingPrefs::deleteEGLContext()
{
#ifdef KWIN_HAVE_OPENGLES
eglMakeCurrent(mEGLDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
eglDestroyContext(mEGLDisplay, mEGLContext);
eglDestroySurface(mEGLDisplay, mEGLSurface);
eglTerminate(mEGLDisplay);
eglReleaseThread();
XDestroyWindow(display(), mGLWindow);
#endif
}
void CompositingPrefs::detectDriverAndVersion()
{
GLPlatform *gl = GLPlatform::instance();
gl->detect();
gl->printResults();
}
// See http://techbase.kde.org/Projects/KWin/HW for a list of some cards that are known to work.
void CompositingPrefs::applyDriverSpecificOptions()
{
// Always recommend
mRecommendCompositing = true;
GLPlatform *gl = GLPlatform::instance();
mStrictBinding = !gl->supports(LooseBinding);
if (gl->driver() == Driver_Intel)
mEnableVSync = false;
}
} // namespace
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