diff options
Diffstat (limited to 'src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.cpp')
| -rw-r--r-- | src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.cpp | 723 |
1 files changed, 723 insertions, 0 deletions
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.cpp b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.cpp new file mode 100644 index 0000000000..c0be836bce --- /dev/null +++ b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.cpp @@ -0,0 +1,723 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the plugins of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL21$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 or version 3 as published by the Free +** Software Foundation and appearing in the file LICENSE.LGPLv21 and +** LICENSE.LGPLv3 included in the packaging of this file. Please review the +** following information to ensure the GNU Lesser General Public License +** requirements will be met: https://www.gnu.org/licenses/lgpl.html and +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QDebug> +#include <QLibrary> + +#include "qxcbwindow.h" +#include "qxcbscreen.h" + +#include <X11/Xlib.h> +#include <X11/Xutil.h> +#include <GL/glx.h> + +#include <QtGui/QOpenGLContext> +#include <QtGui/QOffscreenSurface> + +#include "qglxintegration.h" +#include <QtPlatformSupport/private/qglxconvenience_p.h> +#include <QtPlatformHeaders/QGLXNativeContext> + +#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4) +#include <dlfcn.h> +#endif + +QT_BEGIN_NAMESPACE + +typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*); + +#ifndef GLX_CONTEXT_CORE_PROFILE_BIT_ARB +#define GLX_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001 +#endif + +#ifndef GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB +#define GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002 +#endif + +#ifndef GLX_CONTEXT_ES2_PROFILE_BIT_EXT +#define GLX_CONTEXT_ES2_PROFILE_BIT_EXT 0x00000004 +#endif + +#ifndef GLX_CONTEXT_PROFILE_MASK_ARB +#define GLX_CONTEXT_PROFILE_MASK_ARB 0x9126 +#endif + +#ifndef GL_CONTEXT_FLAG_DEBUG_BIT +#define GL_CONTEXT_FLAG_DEBUG_BIT 0x00000002 +#endif + +static Window createDummyWindow(Display *dpy, XVisualInfo *visualInfo, int screenNumber, Window rootWin) +{ + Colormap cmap = XCreateColormap(dpy, rootWin, visualInfo->visual, AllocNone); + XSetWindowAttributes a; + a.background_pixel = WhitePixel(dpy, screenNumber); + a.border_pixel = BlackPixel(dpy, screenNumber); + a.colormap = cmap; + a.override_redirect = true; + + Window window = XCreateWindow(dpy, rootWin, + 0, 0, 100, 100, + 0, visualInfo->depth, InputOutput, visualInfo->visual, + CWBackPixel|CWBorderPixel|CWColormap|CWOverrideRedirect, &a); +#ifndef QT_NO_DEBUG + XStoreName(dpy, window, "Qt GLX dummy window"); +#endif + XFreeColormap(dpy, cmap); + return window; +} + +static Window createDummyWindow(Display *dpy, GLXFBConfig config, int screenNumber, Window rootWin) +{ + XVisualInfo *visualInfo = glXGetVisualFromFBConfig(dpy, config); + if (!visualInfo) + qFatal("Could not initialize GLX"); + Window window = createDummyWindow(dpy, visualInfo, screenNumber, rootWin); + XFree(visualInfo); + return window; +} + +static inline QByteArray getGlString(GLenum param) +{ + if (const GLubyte *s = glGetString(param)) + return QByteArray(reinterpret_cast<const char*>(s)); + return QByteArray(); +} + +static void updateFormatFromContext(QSurfaceFormat &format) +{ + // Update the version, profile, and context bit of the format + int major = 0, minor = 0; + QByteArray versionString(getGlString(GL_VERSION)); + if (QPlatformOpenGLContext::parseOpenGLVersion(versionString, major, minor)) { + format.setMajorVersion(major); + format.setMinorVersion(minor); + } + + format.setProfile(QSurfaceFormat::NoProfile); + format.setOptions(QSurfaceFormat::FormatOptions()); + + if (format.renderableType() == QSurfaceFormat::OpenGL) { + if (format.version() < qMakePair(3, 0)) { + format.setOption(QSurfaceFormat::DeprecatedFunctions); + return; + } + + // Version 3.0 onwards - check if it includes deprecated functionality or is + // a debug context + GLint value = 0; + glGetIntegerv(GL_CONTEXT_FLAGS, &value); + if (!(value & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)) + format.setOption(QSurfaceFormat::DeprecatedFunctions); + if (value & GL_CONTEXT_FLAG_DEBUG_BIT) + format.setOption(QSurfaceFormat::DebugContext); + if (format.version() < qMakePair(3, 2)) + return; + + // Version 3.2 and newer have a profile + value = 0; + glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &value); + + if (value & GL_CONTEXT_CORE_PROFILE_BIT) + format.setProfile(QSurfaceFormat::CoreProfile); + else if (value & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT) + format.setProfile(QSurfaceFormat::CompatibilityProfile); + } +} + +QGLXContext::QGLXContext(QXcbScreen *screen, const QSurfaceFormat &format, QPlatformOpenGLContext *share, + const QVariant &nativeHandle) + : QPlatformOpenGLContext() + , m_display(DISPLAY_FROM_XCB(screen)) + , m_config(0) + , m_context(0) + , m_shareContext(0) + , m_format(format) + , m_isPBufferCurrent(false) + , m_swapInterval(-1) + , m_ownsContext(nativeHandle.isNull()) +{ + if (nativeHandle.isNull()) + init(screen, share); + else + init(screen, share, nativeHandle); +} + +void QGLXContext::init(QXcbScreen *screen, QPlatformOpenGLContext *share) +{ + if (m_format.renderableType() == QSurfaceFormat::DefaultRenderableType) + m_format.setRenderableType(QSurfaceFormat::OpenGL); + if (m_format.renderableType() != QSurfaceFormat::OpenGL && m_format.renderableType() != QSurfaceFormat::OpenGLES) + return; + + if (share) + m_shareContext = static_cast<const QGLXContext*>(share)->glxContext(); + + GLXFBConfig config = qglx_findConfig(DISPLAY_FROM_XCB(screen),screen->screenNumber(),m_format); + m_config = config; + XVisualInfo *visualInfo = 0; + Window window = 0; // Temporary window used to query OpenGL context + + if (config) { + // Resolve entry point for glXCreateContextAttribsARB + glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0; + glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc) glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB"); + + QList<QByteArray> glxExt = QByteArray(glXQueryExtensionsString(m_display, screen->screenNumber())).split(' '); + bool supportsProfiles = glxExt.contains("GLX_ARB_create_context_profile"); + + // Use glXCreateContextAttribsARB if available + // Also, GL ES context creation requires GLX_EXT_create_context_es2_profile + if (glxExt.contains("GLX_ARB_create_context") && glXCreateContextAttribsARB != 0 + && (m_format.renderableType() != QSurfaceFormat::OpenGLES || (supportsProfiles && glxExt.contains("GLX_EXT_create_context_es2_profile")))) { + // Try to create an OpenGL context for each known OpenGL version in descending + // order from the requested version. + const int requestedVersion = m_format.majorVersion() * 10 + qMin(m_format.minorVersion(), 9); + + QVector<int> glVersions; + if (m_format.renderableType() == QSurfaceFormat::OpenGL) { + if (requestedVersion > 45) + glVersions << requestedVersion; + + // Don't bother with versions below 2.0 + glVersions << 45 << 44 << 43 << 42 << 41 << 40 << 33 << 32 << 31 << 30 << 21 << 20; + } else if (m_format.renderableType() == QSurfaceFormat::OpenGLES) { + if (requestedVersion > 31) + glVersions << requestedVersion; + + // Don't bother with versions below ES 2.0 + glVersions << 31 << 30 << 20; + // ES does not support any format option + m_format.setOptions(QSurfaceFormat::FormatOptions()); + } + + Q_ASSERT(glVersions.count() > 0); + + for (int i = 0; !m_context && i < glVersions.count(); i++) { + const int version = glVersions[i]; + if (version > requestedVersion) + continue; + + const int majorVersion = version / 10; + const int minorVersion = version % 10; + + QVector<int> contextAttributes; + contextAttributes << GLX_CONTEXT_MAJOR_VERSION_ARB << majorVersion + << GLX_CONTEXT_MINOR_VERSION_ARB << minorVersion; + + + if (m_format.renderableType() == QSurfaceFormat::OpenGL) { + // If asking for OpenGL 3.2 or newer we should also specify a profile + if (version >= 32 && supportsProfiles) { + if (m_format.profile() == QSurfaceFormat::CoreProfile) + contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_CORE_PROFILE_BIT_ARB; + else + contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB; + } + + int flags = 0; + + if (m_format.testOption(QSurfaceFormat::DebugContext)) + flags |= GLX_CONTEXT_DEBUG_BIT_ARB; + + // A forward-compatible context may be requested for 3.0 and later + if (version >= 30 && !m_format.testOption(QSurfaceFormat::DeprecatedFunctions)) + flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB; + + if (flags != 0) + contextAttributes << GLX_CONTEXT_FLAGS_ARB << flags; + } else if (m_format.renderableType() == QSurfaceFormat::OpenGLES) { + contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_ES2_PROFILE_BIT_EXT; + } + + contextAttributes << None; + + m_context = glXCreateContextAttribsARB(m_display, config, m_shareContext, true, contextAttributes.data()); + if (!m_context && m_shareContext) { + // re-try without a shared glx context + m_context = glXCreateContextAttribsARB(m_display, config, 0, true, contextAttributes.data()); + if (m_context) + m_shareContext = 0; + } + } + } + + // Could not create a context using glXCreateContextAttribsARB, falling back to glXCreateNewContext. + if (!m_context) { + // requesting an OpenGL ES context requires glXCreateContextAttribsARB, so bail out + if (m_format.renderableType() == QSurfaceFormat::OpenGLES) + return; + + m_context = glXCreateNewContext(m_display, config, GLX_RGBA_TYPE, m_shareContext, true); + if (!m_context && m_shareContext) { + // re-try without a shared glx context + m_context = glXCreateNewContext(m_display, config, GLX_RGBA_TYPE, 0, true); + if (m_context) + m_shareContext = 0; + } + } + + // Get the basic surface format details + if (m_context) + qglx_surfaceFormatFromGLXFBConfig(&m_format, DISPLAY_FROM_XCB(screen), config); + + // Create a temporary window so that we can make the new context current + window = createDummyWindow(DISPLAY_FROM_XCB(screen), config, screen->screenNumber(), screen->root()); + } else { + // requesting an OpenGL ES context requires glXCreateContextAttribsARB, so bail out + if (m_format.renderableType() == QSurfaceFormat::OpenGLES) + return; + + // Note that m_format gets updated with the used surface format + visualInfo = qglx_findVisualInfo(m_display, screen->screenNumber(), &m_format); + if (!visualInfo) + qFatal("Could not initialize GLX"); + m_context = glXCreateContext(m_display, visualInfo, m_shareContext, true); + if (!m_context && m_shareContext) { + // re-try without a shared glx context + m_shareContext = 0; + m_context = glXCreateContext(m_display, visualInfo, Q_NULLPTR, true); + } + + // Create a temporary window so that we can make the new context current + window = createDummyWindow(DISPLAY_FROM_XCB(screen), visualInfo, screen->screenNumber(), screen->root()); + XFree(visualInfo); + } + + // Query the OpenGL version and profile + if (m_context && window) { + GLXContext prevContext = glXGetCurrentContext(); + GLXDrawable prevDrawable = glXGetCurrentDrawable(); + glXMakeCurrent(m_display, window, m_context); + updateFormatFromContext(m_format); + + // Make our context non-current + glXMakeCurrent(m_display, prevDrawable, prevContext); + } + + // Destroy our temporary window + XDestroyWindow(m_display, window); +} + +void QGLXContext::init(QXcbScreen *screen, QPlatformOpenGLContext *share, const QVariant &nativeHandle) +{ + if (!nativeHandle.canConvert<QGLXNativeContext>()) { + qWarning("QGLXContext: Requires a QGLXNativeContext"); + return; + } + QGLXNativeContext handle = nativeHandle.value<QGLXNativeContext>(); + GLXContext context = handle.context(); + if (!context) { + qWarning("QGLXContext: No GLXContext given"); + return; + } + + // Use the provided Display, if available. If not, use our own. It may still work. + Display *dpy = handle.display(); + if (!dpy) + dpy = DISPLAY_FROM_XCB(screen); + + // Legacy contexts created using glXCreateContext are created using a visual + // and the FBConfig cannot be queried. The only way to adapt these contexts + // is to figure out the visual id. + XVisualInfo *vinfo = 0; + // If the VisualID is provided use it. + VisualID vid = handle.visualId(); + if (!vid) { + // In the absence of the VisualID figure it out from the window. + Window wnd = handle.window(); + if (wnd) { + XWindowAttributes attrs; + XGetWindowAttributes(dpy, wnd, &attrs); + vid = XVisualIDFromVisual(attrs.visual); + } + } + if (vid) { + XVisualInfo v; + v.screen = screen->screenNumber(); + v.visualid = vid; + int n = 0; + vinfo = XGetVisualInfo(dpy, VisualScreenMask | VisualIDMask, &v, &n); + if (n < 1) { + XFree(vinfo); + vinfo = 0; + } + } + + // For contexts created with an FBConfig using the modern functions providing the + // visual or window is not mandatory. Just query the config from the context. + GLXFBConfig config = 0; + if (!vinfo) { + int configId = 0; + if (glXQueryContext(dpy, context, GLX_FBCONFIG_ID, &configId) != Success) { + qWarning("QGLXContext: Failed to query config from the provided context"); + return; + } + + GLXFBConfig *configs; + int numConfigs = 0; + static const int attribs[] = { GLX_FBCONFIG_ID, configId, None }; + configs = glXChooseFBConfig(dpy, screen->screenNumber(), attribs, &numConfigs); + if (!configs || numConfigs < 1) { + qWarning("QGLXContext: Failed to find config"); + return; + } + if (configs && numConfigs > 1) // this is suspicious so warn but let it continue + qWarning("QGLXContext: Multiple configs for FBConfig ID %d", configId); + + config = configs[0]; + // Store the config. + m_config = config; + } + + Q_ASSERT(vinfo || config); + + int screenNumber = DefaultScreen(dpy); + Window window; + if (vinfo) + window = createDummyWindow(dpy, vinfo, screenNumber, RootWindow(dpy, screenNumber)); + else + window = createDummyWindow(dpy, config, screenNumber, RootWindow(dpy, screenNumber)); + if (!window) { + qWarning("QGLXContext: Failed to create dummy window"); + return; + } + + // Update OpenGL version and buffer sizes in our format. + GLXContext prevContext = glXGetCurrentContext(); + GLXDrawable prevDrawable = glXGetCurrentDrawable(); + if (!glXMakeCurrent(dpy, window, context)) { + qWarning("QGLXContext: Failed to make provided context current"); + return; + } + m_format = QSurfaceFormat(); + m_format.setRenderableType(QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL + ? QSurfaceFormat::OpenGL : QSurfaceFormat::OpenGLES); + updateFormatFromContext(m_format); + if (vinfo) + qglx_surfaceFormatFromVisualInfo(&m_format, dpy, vinfo); + else + qglx_surfaceFormatFromGLXFBConfig(&m_format, dpy, config); + glXMakeCurrent(dpy, prevDrawable, prevContext); + XDestroyWindow(dpy, window); + + if (vinfo) + XFree(vinfo); + + // Success. Store the context. From this point on isValid() is true. + m_context = context; + + if (share) + m_shareContext = static_cast<const QGLXContext*>(share)->glxContext(); +} + +QGLXContext::~QGLXContext() +{ + if (m_ownsContext) + glXDestroyContext(m_display, m_context); +} + +static QXcbScreen *screenForPlatformSurface(QPlatformSurface *surface) +{ + QSurface::SurfaceClass surfaceClass = surface->surface()->surfaceClass(); + if (surfaceClass == QSurface::Window) { + return static_cast<QXcbScreen *>(static_cast<QXcbWindow *>(surface)->screen()); + } else if (surfaceClass == QSurface::Offscreen) { + return static_cast<QXcbScreen *>(static_cast<QGLXPbuffer *>(surface)->screen()); + } + return Q_NULLPTR; +} + +QVariant QGLXContext::nativeHandle() const +{ + return QVariant::fromValue<QGLXNativeContext>(QGLXNativeContext(m_context)); +} + +bool QGLXContext::makeCurrent(QPlatformSurface *surface) +{ + bool success = false; + Q_ASSERT(surface->surface()->supportsOpenGL()); + + GLXDrawable glxDrawable = 0; + QSurface::SurfaceClass surfaceClass = surface->surface()->surfaceClass(); + if (surfaceClass == QSurface::Window) { + m_isPBufferCurrent = false; + QXcbWindow *window = static_cast<QXcbWindow *>(surface); + glxDrawable = window->xcb_window(); + success = glXMakeCurrent(m_display, glxDrawable, m_context); + } else if (surfaceClass == QSurface::Offscreen) { + m_isPBufferCurrent = true; + QGLXPbuffer *pbuffer = static_cast<QGLXPbuffer *>(surface); + glxDrawable = pbuffer->pbuffer(); + success = glXMakeContextCurrent(m_display, glxDrawable, glxDrawable, m_context); + } + + if (success) { + int interval = surface->format().swapInterval(); + QXcbScreen *screen = screenForPlatformSurface(surface); + if (interval >= 0 && m_swapInterval != interval && screen) { + m_swapInterval = interval; + typedef void (*qt_glXSwapIntervalEXT)(Display *, GLXDrawable, int); + typedef void (*qt_glXSwapIntervalMESA)(unsigned int); + static qt_glXSwapIntervalEXT glXSwapIntervalEXT = 0; + static qt_glXSwapIntervalMESA glXSwapIntervalMESA = 0; + static bool resolved = false; + if (!resolved) { + resolved = true; + QList<QByteArray> glxExt = QByteArray(glXQueryExtensionsString(m_display, + screen->screenNumber())).split(' '); + if (glxExt.contains("GLX_EXT_swap_control")) + glXSwapIntervalEXT = (qt_glXSwapIntervalEXT) getProcAddress("glXSwapIntervalEXT"); + if (glxExt.contains("GLX_MESA_swap_control")) + glXSwapIntervalMESA = (qt_glXSwapIntervalMESA) getProcAddress("glXSwapIntervalMESA"); + } + if (glXSwapIntervalEXT) + glXSwapIntervalEXT(m_display, glxDrawable, interval); + else if (glXSwapIntervalMESA) + glXSwapIntervalMESA(interval); + } + } + + return success; +} + +void QGLXContext::doneCurrent() +{ + if (m_isPBufferCurrent) + glXMakeContextCurrent(m_display, 0, 0, 0); + else + glXMakeCurrent(m_display, 0, 0); + m_isPBufferCurrent = false; +} + +void QGLXContext::swapBuffers(QPlatformSurface *surface) +{ + GLXDrawable glxDrawable = 0; + if (surface->surface()->surfaceClass() == QSurface::Offscreen) + glxDrawable = static_cast<QGLXPbuffer *>(surface)->pbuffer(); + else + glxDrawable = static_cast<QXcbWindow *>(surface)->xcb_window(); + glXSwapBuffers(m_display, glxDrawable); + + if (surface->surface()->surfaceClass() == QSurface::Window) { + QXcbWindow *platformWindow = static_cast<QXcbWindow *>(surface); + // OpenGL context might be bound to a non-gui thread use QueuedConnection to sync + // the window from the platformWindow's thread as QXcbWindow is no QObject, an + // event is sent to QXcbConnection. (this is faster than a metacall) + if (platformWindow->needsSync()) + platformWindow->postSyncWindowRequest(); + } +} + +void (*QGLXContext::getProcAddress(const QByteArray &procName)) () +{ + typedef void *(*qt_glXGetProcAddressARB)(const GLubyte *); + static qt_glXGetProcAddressARB glXGetProcAddressARB = 0; + static bool resolved = false; + + if (resolved && !glXGetProcAddressARB) + return 0; + if (!glXGetProcAddressARB) { + QList<QByteArray> glxExt = QByteArray(glXGetClientString(m_display, GLX_EXTENSIONS)).split(' '); + if (glxExt.contains("GLX_ARB_get_proc_address")) { +#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4) + void *handle = dlopen(NULL, RTLD_LAZY); + if (handle) { + glXGetProcAddressARB = (qt_glXGetProcAddressARB) dlsym(handle, "glXGetProcAddressARB"); + dlclose(handle); + } + if (!glXGetProcAddressARB) +#endif + { + extern const QString qt_gl_library_name(); +// QLibrary lib(qt_gl_library_name()); + QLibrary lib(QLatin1String("GL")); + glXGetProcAddressARB = (qt_glXGetProcAddressARB) lib.resolve("glXGetProcAddressARB"); + } + } + resolved = true; + } + if (!glXGetProcAddressARB) + return 0; + return (void (*)())glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(procName.constData())); +} + +QSurfaceFormat QGLXContext::format() const +{ + return m_format; +} + +bool QGLXContext::isSharing() const +{ + return m_shareContext != 0; +} + +bool QGLXContext::isValid() const +{ + return m_context != 0; +} + +bool QGLXContext::m_queriedDummyContext = false; +bool QGLXContext::m_supportsThreading = true; + + +// If this list grows to any significant size, change it a +// proper string table and make the implementation below use +// binary search. +static const char *qglx_threadedgl_blacklist_renderer[] = { + "Chromium", // QTBUG-32225 (initialization fails) + 0 +}; + +// This disables threaded rendering on anything using mesa, e.g. +// - nvidia/nouveau +// - amd/gallium +// - intel +// - some software opengl implementations +// +// The client glx vendor string is used to identify those setups as that seems to show the least +// variance between the bad configurations. It's always "Mesa Project and SGI". There are some +// configurations which don't use mesa and which can do threaded rendering (amd and nvidia chips +// with their own proprietary drivers). +// +// This, of course, is very broad and disables threaded rendering on a lot of devices which would +// be able to use it. However, the bugs listed below don't follow any easily recognizable pattern +// and we should rather be safe. +// +// http://cgit.freedesktop.org/xcb/libxcb/commit/?id=be0fe56c3bcad5124dcc6c47a2fad01acd16f71a will +// fix some of the issues. Basically, the proprietary drivers seem to have a way of working around +// a fundamental flaw with multithreaded access to xcb, but mesa doesn't. The blacklist should be +// reevaluated once that patch is released in some version of xcb. +static const char *qglx_threadedgl_blacklist_vendor[] = { + "Mesa Project and SGI", // QTCREATORBUG-10875 (crash in creator) + // QTBUG-34492 (flickering in fullscreen) + // QTBUG-38221 + 0 +}; + +void QGLXContext::queryDummyContext() +{ + if (m_queriedDummyContext) + return; + m_queriedDummyContext = true; + + static bool skip = qEnvironmentVariableIsSet("QT_OPENGL_NO_SANITY_CHECK"); + if (skip) + return; + + QOpenGLContext *oldContext = QOpenGLContext::currentContext(); + QSurface *oldSurface = 0; + if (oldContext) + oldSurface = oldContext->surface(); + + QScopedPointer<QSurface> surface; + const char *glxvendor = glXGetClientString(glXGetCurrentDisplay(), GLX_VENDOR); + if (glxvendor && !strcmp(glxvendor, "ATI")) { + QWindow *window = new QWindow; + window->resize(64, 64); + window->setSurfaceType(QSurface::OpenGLSurface); + window->create(); + surface.reset(window); + } else { + QOffscreenSurface *offSurface = new QOffscreenSurface; + offSurface->create(); + surface.reset(offSurface); + } + + QOpenGLContext context; + context.create(); + context.makeCurrent(surface.data()); + + m_supportsThreading = true; + + if (const char *renderer = (const char *) glGetString(GL_RENDERER)) { + for (int i = 0; qglx_threadedgl_blacklist_renderer[i]; ++i) { + if (strstr(renderer, qglx_threadedgl_blacklist_renderer[i]) != 0) { + m_supportsThreading = false; + break; + } + } + } + + if (glxvendor) { + for (int i = 0; qglx_threadedgl_blacklist_vendor[i]; ++i) { + if (strstr(glxvendor, qglx_threadedgl_blacklist_vendor[i]) != 0) { + m_supportsThreading = false; + break; + } + } + } + + context.doneCurrent(); + if (oldContext && oldSurface) + oldContext->makeCurrent(oldSurface); +} + +bool QGLXContext::supportsThreading() +{ + if (!m_queriedDummyContext) + queryDummyContext(); + return m_supportsThreading; +} + +QGLXPbuffer::QGLXPbuffer(QOffscreenSurface *offscreenSurface) + : QPlatformOffscreenSurface(offscreenSurface) + , m_format(offscreenSurface->requestedFormat()) + , m_screen(static_cast<QXcbScreen *>(offscreenSurface->screen()->handle())) + , m_pbuffer(0) +{ + GLXFBConfig config = qglx_findConfig(DISPLAY_FROM_XCB(m_screen), m_screen->screenNumber(), m_format); + + if (config) { + const int attributes[] = { + GLX_PBUFFER_WIDTH, offscreenSurface->size().width(), + GLX_PBUFFER_HEIGHT, offscreenSurface->size().height(), + GLX_LARGEST_PBUFFER, False, + GLX_PRESERVED_CONTENTS, False, + None + }; + + m_pbuffer = glXCreatePbuffer(DISPLAY_FROM_XCB(m_screen), config, attributes); + + if (m_pbuffer) + qglx_surfaceFormatFromGLXFBConfig(&m_format, DISPLAY_FROM_XCB(m_screen), config); + } +} + +QGLXPbuffer::~QGLXPbuffer() +{ + if (m_pbuffer) + glXDestroyPbuffer(DISPLAY_FROM_XCB(m_screen), m_pbuffer); +} + + +QT_END_NAMESPACE |