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45 #include "qxcbwindow.h"
46 #include "qxcbscreen.h"
49 #include <X11/Xutil.h>
52 #include <QtGui/QOpenGLContext>
54 #include "qglxintegration.h"
55 #include <QtPlatformSupport/private/qglxconvenience_p.h>
57 #if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
63 typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
65 #ifndef GLX_CONTEXT_CORE_PROFILE_BIT_ARB
66 #define GLX_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001
69 #ifndef GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB
70 #define GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
73 #ifndef GLX_CONTEXT_PROFILE_MASK_ARB
74 #define GLX_CONTEXT_PROFILE_MASK_ARB 0x9126
77 static Window createDummyWindow(QXcbScreen *screen, XVisualInfo *visualInfo)
79 Colormap cmap = XCreateColormap(DISPLAY_FROM_XCB(screen), screen->root(), visualInfo->visual, AllocNone);
80 XSetWindowAttributes a;
81 a.background_pixel = WhitePixel(DISPLAY_FROM_XCB(screen), screen->screenNumber());
82 a.border_pixel = BlackPixel(DISPLAY_FROM_XCB(screen), screen->screenNumber());
85 Window window = XCreateWindow(DISPLAY_FROM_XCB(screen), screen->root(),
87 0, visualInfo->depth, InputOutput, visualInfo->visual,
88 CWBackPixel|CWBorderPixel|CWColormap, &a);
89 XFreeColormap(DISPLAY_FROM_XCB(screen), cmap);
93 static Window createDummyWindow(QXcbScreen *screen, GLXFBConfig config)
95 XVisualInfo *visualInfo = glXGetVisualFromFBConfig(DISPLAY_FROM_XCB(screen), config);
97 qFatal("Could not initialize GLX");
98 Window window = createDummyWindow(screen, visualInfo);
103 // Per-window data for active OpenGL contexts.
104 struct QOpenGLContextData
106 QOpenGLContextData(Display *display, Window window, GLXContext context)
107 : m_display(display),
120 GLXContext m_context;
123 static inline QOpenGLContextData currentOpenGLContextData()
125 QOpenGLContextData result;
126 result.m_display = glXGetCurrentDisplay();
127 result.m_window = glXGetCurrentDrawable();
128 result.m_context = glXGetCurrentContext();
132 static inline QOpenGLContextData createDummyWindowOpenGLContextData(QXcbScreen *screen)
134 QOpenGLContextData result;
135 result.m_display = DISPLAY_FROM_XCB(screen);
137 QSurfaceFormat format;
138 GLXFBConfig config = qglx_findConfig(DISPLAY_FROM_XCB(screen), screen->screenNumber(), format);
140 result.m_context = glXCreateNewContext(DISPLAY_FROM_XCB(screen), config, GLX_RGBA_TYPE, 0, true);
141 result.m_window = createDummyWindow(screen, config);
143 XVisualInfo *visualInfo = qglx_findVisualInfo(DISPLAY_FROM_XCB(screen), screen->screenNumber(), &format);
145 qFatal("Could not initialize GLX");
146 result.m_context = glXCreateContext(DISPLAY_FROM_XCB(screen), visualInfo, 0, true);
147 result.m_window = createDummyWindow(screen, visualInfo);
154 static inline QByteArray getGlString(GLenum param)
156 if (const GLubyte *s = glGetString(param))
157 return QByteArray(reinterpret_cast<const char*>(s));
161 static void updateFormatFromContext(QSurfaceFormat &format)
163 // Update the version, profile, and context bit of the format
164 int major = 0, minor = 0;
165 QByteArray versionString(getGlString(GL_VERSION));
166 if (QPlatformOpenGLContext::parseOpenGLVersion(versionString, major, minor)) {
167 format.setMajorVersion(major);
168 format.setMinorVersion(minor);
171 const int version = (major << 8) + minor;
172 if (version < 0x0300) {
173 format.setProfile(QSurfaceFormat::NoProfile);
174 format.setOption(QSurfaceFormat::DeprecatedFunctions);
178 // Version 3.0 onwards - check if it includes deprecated functionality or is
181 glGetIntegerv(GL_CONTEXT_FLAGS, &value);
182 if (value & ~GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
183 format.setOption(QSurfaceFormat::DeprecatedFunctions);
184 if (value & GLX_CONTEXT_DEBUG_BIT_ARB)
185 format.setOption(QSurfaceFormat::DebugContext);
186 if (version < 0x0302)
189 // Version 3.2 and newer have a profile
191 glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &value);
193 case GLX_CONTEXT_CORE_PROFILE_BIT_ARB:
194 format.setProfile(QSurfaceFormat::CoreProfile);
196 case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
197 format.setProfile(QSurfaceFormat::CompatibilityProfile);
200 format.setProfile(QSurfaceFormat::NoProfile);
206 \class QOpenGLTemporaryContext
207 \brief A temporary context that can be instantiated on the stack.
209 Functions like glGetString() only work if there is a current GL context.
212 \ingroup qt-lighthouse-xcb
214 class QOpenGLTemporaryContext
216 Q_DISABLE_COPY(QOpenGLTemporaryContext)
218 QOpenGLTemporaryContext(QXcbScreen *screen);
219 ~QOpenGLTemporaryContext();
222 const QOpenGLContextData m_previous;
223 const QOpenGLContextData m_current;
226 QOpenGLTemporaryContext::QOpenGLTemporaryContext(QXcbScreen *screen)
227 : m_previous(currentOpenGLContextData()),
228 m_current(createDummyWindowOpenGLContextData(screen))
230 // Make our temporary context current on our temporary window
231 glXMakeCurrent(m_current.m_display, m_current.m_window, m_current.m_context);
234 QOpenGLTemporaryContext::~QOpenGLTemporaryContext()
236 // Restore the previous context if possible, otherwise just release our temporary context
237 if (m_previous.m_display)
238 glXMakeCurrent(m_previous.m_display, m_previous.m_window, m_previous.m_context);
240 glXMakeCurrent(m_current.m_display, 0, 0);
242 // Destroy our temporary window
243 XDestroyWindow(m_current.m_display, m_current.m_window);
245 // Finally destroy our temporary context itself
246 glXDestroyContext(m_current.m_display, m_current.m_context);
249 QOpenGLDefaultContextInfo::QOpenGLDefaultContextInfo()
250 : vendor(getGlString(GL_VENDOR)),
251 renderer(getGlString(GL_RENDERER))
253 updateFormatFromContext(format);
256 QOpenGLDefaultContextInfo *QOpenGLDefaultContextInfo::create(QXcbScreen *screen)
258 // We need a current context for getGLString() to work. To have
259 // the QOpenGLDefaultContextInfo contain the latest supported
260 // context version, we rely upon the QOpenGLTemporaryContext to
261 // correctly obtain a context with the latest version
262 QScopedPointer<QOpenGLTemporaryContext> temporaryContext(new QOpenGLTemporaryContext(screen));
263 QOpenGLDefaultContextInfo *result = new QOpenGLDefaultContextInfo;
268 QGLXContext::QGLXContext(QXcbScreen *screen, const QSurfaceFormat &format, QPlatformOpenGLContext *share, QOpenGLDefaultContextInfo *defaultContextInfo)
269 : QPlatformOpenGLContext()
276 m_shareContext = static_cast<const QGLXContext*>(share)->glxContext();
278 GLXFBConfig config = qglx_findConfig(DISPLAY_FROM_XCB(screen),screen->screenNumber(),format);
279 XVisualInfo *visualInfo = 0;
280 Window window = 0; // Temporary window used to query OpenGL context
283 // Resolve entry point for glXCreateContextAttribsARB
284 glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0;
285 glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc) glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
287 // Use glXCreateContextAttribsARB if is available
288 if (glXCreateContextAttribsARB != 0) {
289 // We limit the requested version by the version of the static context as
290 // glXCreateContextAttribsARB fails and returns NULL if the requested context
291 // version is not supported. This means that we will get the closest supported
292 // context format that that which was requested and is supported by the driver
293 const int maxSupportedVersion = (defaultContextInfo->format.majorVersion() << 8)
294 + defaultContextInfo->format.minorVersion();
295 const int requestedVersion = qMin((format.majorVersion() << 8) + format.minorVersion(),
296 maxSupportedVersion);
297 const int majorVersion = requestedVersion >> 8;
298 const int minorVersion = requestedVersion & 0xFF;
300 QVector<int> contextAttributes;
301 contextAttributes << GLX_CONTEXT_MAJOR_VERSION_ARB << majorVersion
302 << GLX_CONTEXT_MINOR_VERSION_ARB << minorVersion;
304 // If asking for OpenGL 3.2 or newer we should also specify a profile
305 if (m_format.majorVersion() > 3 || (m_format.majorVersion() == 3 && m_format.minorVersion() > 1)) {
306 if (m_format.profile() == QSurfaceFormat::CoreProfile) {
307 contextAttributes << GLX_CONTEXT_FLAGS_ARB << GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB
308 << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
310 contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
314 contextAttributes << None;
316 m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, m_shareContext, true, contextAttributes.data());
317 if (!m_context && m_shareContext) {
318 // re-try without a shared glx context
319 m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, 0, true, contextAttributes.data());
325 // Could not create a context using glXCreateContextAttribsARB, falling back to glXCreateNewContext.
327 m_context = glXCreateNewContext(DISPLAY_FROM_XCB(screen), config, GLX_RGBA_TYPE, m_shareContext, true);
328 if (!m_context && m_shareContext) {
329 // re-try without a shared glx context
330 m_context = glXCreateNewContext(DISPLAY_FROM_XCB(screen), config, GLX_RGBA_TYPE, 0, true);
336 // Get the basic surface format details
338 m_format = qglx_surfaceFormatFromGLXFBConfig(DISPLAY_FROM_XCB(screen), config, m_context);
340 // Create a temporary window so that we can make the new context current
341 window = createDummyWindow(screen, config);
343 // Note that m_format gets updated with the used surface format
344 visualInfo = qglx_findVisualInfo(DISPLAY_FROM_XCB(screen), screen->screenNumber(), &m_format);
346 qFatal("Could not initialize GLX");
347 m_context = glXCreateContext(DISPLAY_FROM_XCB(screen), visualInfo, m_shareContext, true);
348 if (!m_context && m_shareContext) {
349 // re-try without a shared glx context
351 m_context = glXCreateContext(DISPLAY_FROM_XCB(screen), visualInfo, 0, true);
354 // Create a temporary window so that we can make the new context current
355 window = createDummyWindow(screen, visualInfo);
359 // Query the OpenGL version and profile
360 if (m_context && window) {
361 glXMakeCurrent(DISPLAY_FROM_XCB(screen), window, m_context);
362 updateFormatFromContext(m_format);
364 // Make our context non-current
365 glXMakeCurrent(DISPLAY_FROM_XCB(screen), 0, 0);
368 // Destroy our temporary window
369 XDestroyWindow(DISPLAY_FROM_XCB(screen), window);
372 QGLXContext::~QGLXContext()
374 glXDestroyContext(DISPLAY_FROM_XCB(m_screen), m_context);
377 bool QGLXContext::makeCurrent(QPlatformSurface *surface)
379 Q_ASSERT(surface->surface()->surfaceType() == QSurface::OpenGLSurface);
381 GLXDrawable glxDrawable = static_cast<QXcbWindow *>(surface)->xcb_window();
383 return glXMakeCurrent(DISPLAY_FROM_XCB(m_screen), glxDrawable, m_context);
386 void QGLXContext::doneCurrent()
388 glXMakeCurrent(DISPLAY_FROM_XCB(m_screen), 0, 0);
391 void QGLXContext::swapBuffers(QPlatformSurface *surface)
393 GLXDrawable glxDrawable = static_cast<QXcbWindow *>(surface)->xcb_window();
394 glXSwapBuffers(DISPLAY_FROM_XCB(m_screen), glxDrawable);
397 void (*QGLXContext::getProcAddress(const QByteArray &procName)) ()
399 typedef void *(*qt_glXGetProcAddressARB)(const GLubyte *);
400 static qt_glXGetProcAddressARB glXGetProcAddressARB = 0;
401 static bool resolved = false;
403 if (resolved && !glXGetProcAddressARB)
405 if (!glXGetProcAddressARB) {
406 QList<QByteArray> glxExt = QByteArray(glXGetClientString(DISPLAY_FROM_XCB(m_screen), GLX_EXTENSIONS)).split(' ');
407 if (glxExt.contains("GLX_ARB_get_proc_address")) {
408 #if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
409 void *handle = dlopen(NULL, RTLD_LAZY);
411 glXGetProcAddressARB = (qt_glXGetProcAddressARB) dlsym(handle, "glXGetProcAddressARB");
414 if (!glXGetProcAddressARB)
417 extern const QString qt_gl_library_name();
418 // QLibrary lib(qt_gl_library_name());
419 QLibrary lib(QLatin1String("GL"));
420 glXGetProcAddressARB = (qt_glXGetProcAddressARB) lib.resolve("glXGetProcAddressARB");
425 if (!glXGetProcAddressARB)
427 return (void (*)())glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(procName.constData()));
430 QSurfaceFormat QGLXContext::format() const
435 bool QGLXContext::isSharing() const
437 return m_shareContext != 0;
440 bool QGLXContext::isValid() const
442 return m_context != 0;