EGLConfig QEglConfigChooser::chooseConfig()
{
QVector<EGLint> configureAttributes = q_createConfigAttributesFromFormat(m_format);
configureAttributes.append(EGL_SURFACE_TYPE);
configureAttributes.append(surfaceType());
configureAttributes.append(EGL_RENDERABLE_TYPE);
bool needsES2Plus = false;
switch (m_format.renderableType()) {
case QSurfaceFormat::OpenVG:
configureAttributes.append(EGL_OPENVG_BIT);
break;
#ifdef EGL_VERSION_1_4
case QSurfaceFormat::DefaultRenderableType:
#ifndef QT_NO_OPENGL
if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL)
configureAttributes.append(EGL_OPENGL_BIT);
else
#endif // QT_NO_OPENGL
needsES2Plus = true;
break;
case QSurfaceFormat::OpenGL:
configureAttributes.append(EGL_OPENGL_BIT);
break;
#endif
case QSurfaceFormat::OpenGLES:
if (m_format.majorVersion() == 1) {
configureAttributes.append(EGL_OPENGL_ES_BIT);
break;
}
// fall through
default:
needsES2Plus = true;
break;
}
if (needsES2Plus) {
if (m_format.majorVersion() >= 3 && q_hasEglExtension(display(), "EGL_KHR_create_context"))
configureAttributes.append(EGL_OPENGL_ES3_BIT_KHR);
else
configureAttributes.append(EGL_OPENGL_ES2_BIT);
}
configureAttributes.append(EGL_NONE);
EGLConfig cfg = 0;
do {
// Get the number of matching configurations for this set of properties.
EGLint matching = 0;
if (!eglChooseConfig(display(), configureAttributes.constData(), 0, 0, &matching) || !matching)
continue;
// Fetch all of the matching configurations and find the
// first that matches the pixel format we wanted.
int i = configureAttributes.indexOf(EGL_RED_SIZE);
m_confAttrRed = configureAttributes.at(i+1);
i = configureAttributes.indexOf(EGL_GREEN_SIZE);
m_confAttrGreen = configureAttributes.at(i+1);
i = configureAttributes.indexOf(EGL_BLUE_SIZE);
m_confAttrBlue = configureAttributes.at(i+1);
i = configureAttributes.indexOf(EGL_ALPHA_SIZE);
m_confAttrAlpha = i == -1 ? 0 : configureAttributes.at(i+1);
QVector<EGLConfig> configs(matching);
eglChooseConfig(display(), configureAttributes.constData(), configs.data(), configs.size(), &matching);
if (!cfg && matching > 0)
cfg = configs.first();
// Filter the list. Due to the EGL sorting rules configs with higher depth are
// placed first when the minimum color channel sizes have been specified (i.e. the
// QSurfaceFormat contains color sizes > 0). To prevent returning a 888 config
// when the QSurfaceFormat explicitly asked for 565, go through the returned
// configs and look for one that exactly matches the requested sizes. When no
// sizes have been given, take the first, which will be a config with the smaller
// (e.g. 16-bit) depth.
for (int i = 0; i < configs.size(); ++i) {
if (filterConfig(configs[i]))
return configs.at(i);
}
} while (q_reduceConfigAttributes(&configureAttributes));
if (!cfg)
qWarning("Cant find EGLConfig, returning null config");
return cfg;
}
void QEGLPlatformContext::init(const QSurfaceFormat &format, QPlatformOpenGLContext *share)
{
m_format = q_glFormatFromConfig(m_eglDisplay, m_eglConfig);
// m_format now has the renderableType() resolved (it cannot be Default anymore)
// but does not yet contain version, profile, options.
m_shareContext = share ? static_cast<QEGLPlatformContext *>(share)->m_eglContext : 0;
QVector<EGLint> contextAttrs;
contextAttrs.append(EGL_CONTEXT_CLIENT_VERSION);
contextAttrs.append(format.majorVersion());
const bool hasKHRCreateContext = q_hasEglExtension(m_eglDisplay, "EGL_KHR_create_context");
if (hasKHRCreateContext) {
contextAttrs.append(EGL_CONTEXT_MINOR_VERSION_KHR);
contextAttrs.append(format.minorVersion());
int flags = 0;
// The debug bit is supported both for OpenGL and OpenGL ES.
if (format.testOption(QSurfaceFormat::DebugContext))
flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
// The fwdcompat bit is only for OpenGL 3.0+.
if (m_format.renderableType() == QSurfaceFormat::OpenGL
&& format.majorVersion() >= 3
&& !format.testOption(QSurfaceFormat::DeprecatedFunctions))
flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
if (flags) {
contextAttrs.append(EGL_CONTEXT_FLAGS_KHR);
contextAttrs.append(flags);
}
// Profiles are OpenGL only and mandatory in 3.2+. The value is silently ignored for < 3.2.
if (m_format.renderableType() == QSurfaceFormat::OpenGL) {
contextAttrs.append(EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR);
contextAttrs.append(format.profile() == QSurfaceFormat::CoreProfile
? EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR
: EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR);
}
}
contextAttrs.append(EGL_NONE);
switch (m_format.renderableType()) {
case QSurfaceFormat::OpenVG:
m_api = EGL_OPENVG_API;
break;
#ifdef EGL_VERSION_1_4
case QSurfaceFormat::OpenGL:
m_api = EGL_OPENGL_API;
break;
#endif // EGL_VERSION_1_4
default:
m_api = EGL_OPENGL_ES_API;
break;
}
eglBindAPI(m_api);
m_eglContext = eglCreateContext(m_eglDisplay, m_eglConfig, m_shareContext, contextAttrs.constData());
if (m_eglContext == EGL_NO_CONTEXT && m_shareContext != EGL_NO_CONTEXT) {
m_shareContext = 0;
m_eglContext = eglCreateContext(m_eglDisplay, m_eglConfig, 0, contextAttrs.constData());
}
if (m_eglContext == EGL_NO_CONTEXT) {
qWarning("QEGLPlatformContext: Failed to create context: %x", eglGetError());
return;
}
static const bool printConfig = qEnvironmentVariableIntValue("QT_QPA_EGLFS_DEBUG");
if (printConfig) {
qDebug() << "Created context for format" << format << "with config:";
q_printEglConfig(m_eglDisplay, m_eglConfig);
}
// Cannot just call updateFormatFromGL() since it relies on virtuals. Defer it to initialize().
}
void QEGLPlatformContext::updateFormatFromGL()
{
#ifndef QT_NO_OPENGL
// Have to save & restore to prevent QOpenGLContext::currentContext() from becoming
// inconsistent after QOpenGLContext::create().
EGLDisplay prevDisplay = eglGetCurrentDisplay();
if (prevDisplay == EGL_NO_DISPLAY) // when no context is current
prevDisplay = m_eglDisplay;
EGLContext prevContext = eglGetCurrentContext();
EGLSurface prevSurfaceDraw = eglGetCurrentSurface(EGL_DRAW);
EGLSurface prevSurfaceRead = eglGetCurrentSurface(EGL_READ);
// Rely on the surfaceless extension, if available. This is beneficial since we can
// avoid creating an extra pbuffer surface which is apparently troublesome with some
// drivers (Mesa) when certain attributes are present (multisampling).
EGLSurface tempSurface = EGL_NO_SURFACE;
if (!q_hasEglExtension(m_eglDisplay, "EGL_KHR_surfaceless_context"))
tempSurface = createTemporaryOffscreenSurface();
if (eglMakeCurrent(m_eglDisplay, tempSurface, tempSurface, m_eglContext)) {
if (m_format.renderableType() == QSurfaceFormat::OpenGL
|| m_format.renderableType() == QSurfaceFormat::OpenGLES) {
const GLubyte *s = glGetString(GL_VERSION);
if (s) {
QByteArray version = QByteArray(reinterpret_cast<const char *>(s));
int major, minor;
if (QPlatformOpenGLContext::parseOpenGLVersion(version, major, minor)) {
#ifdef Q_OS_ANDROID
// Some Android 4.2.2 devices report OpenGL ES 3.0 without the functions being available.
static int apiLevel = QtAndroidPrivate::androidSdkVersion();
if (apiLevel <= 17 && major >= 3) {
major = 2;
minor = 0;
}
#endif
m_format.setMajorVersion(major);
m_format.setMinorVersion(minor);
}
}
m_format.setProfile(QSurfaceFormat::NoProfile);
m_format.setOptions(QSurfaceFormat::FormatOptions());
if (m_format.renderableType() == QSurfaceFormat::OpenGL) {
// Check profile and options.
if (m_format.majorVersion() < 3) {
m_format.setOption(QSurfaceFormat::DeprecatedFunctions);
} else {
GLint value = 0;
glGetIntegerv(GL_CONTEXT_FLAGS, &value);
if (!(value & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT))
m_format.setOption(QSurfaceFormat::DeprecatedFunctions);
if (value & GL_CONTEXT_FLAG_DEBUG_BIT)
m_format.setOption(QSurfaceFormat::DebugContext);
if (m_format.version() >= qMakePair(3, 2)) {
value = 0;
glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &value);
if (value & GL_CONTEXT_CORE_PROFILE_BIT)
m_format.setProfile(QSurfaceFormat::CoreProfile);
else if (value & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT)
m_format.setProfile(QSurfaceFormat::CompatibilityProfile);
}
}
}
}
eglMakeCurrent(prevDisplay, prevSurfaceDraw, prevSurfaceRead, prevContext);
} else {
qWarning("QEGLPlatformContext: Failed to make temporary surface current, format not updated");
}
if (tempSurface != EGL_NO_SURFACE)
destroyTemporaryOffscreenSurface(tempSurface);
#endif // QT_NO_OPENGL
}
VisualID QXlibEglIntegration::getCompatibleVisualId(Display *display, EGLDisplay eglDisplay, EGLConfig config)
{
VisualID visualId = 0;
EGLint eglValue = 0;
EGLint configRedSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_RED_SIZE, &configRedSize);
EGLint configGreenSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_GREEN_SIZE, &configGreenSize);
EGLint configBlueSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_BLUE_SIZE, &configBlueSize);
EGLint configAlphaSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_ALPHA_SIZE, &configAlphaSize);
eglGetConfigAttrib(eglDisplay, config, EGL_CONFIG_ID, &eglValue);
int configId = eglValue;
// See if EGL provided a valid VisualID:
eglGetConfigAttrib(eglDisplay, config, EGL_NATIVE_VISUAL_ID, &eglValue);
visualId = (VisualID)eglValue;
if (visualId) {
// EGL has suggested a visual id, so get the rest of the visual info for that id:
XVisualInfo visualInfoTemplate;
memset(&visualInfoTemplate, 0, sizeof(XVisualInfo));
visualInfoTemplate.visualid = visualId;
XVisualInfo *chosenVisualInfo;
int matchingCount = 0;
chosenVisualInfo = XGetVisualInfo(display, VisualIDMask, &visualInfoTemplate, &matchingCount);
if (chosenVisualInfo) {
// Skip size checks if implementation supports non-matching visual
// and config (http://bugreports.qt-project.org/browse/QTBUG-9444).
if (q_hasEglExtension(eglDisplay,"EGL_NV_post_convert_rounding")) {
XFree(chosenVisualInfo);
return visualId;
}
int visualRedSize = countBits(chosenVisualInfo->red_mask);
int visualGreenSize = countBits(chosenVisualInfo->green_mask);
int visualBlueSize = countBits(chosenVisualInfo->blue_mask);
int visualAlphaSize = -1; // Need XRender to tell us the alpha channel size
bool visualMatchesConfig = false;
if ( visualRedSize == configRedSize &&
visualGreenSize == configGreenSize &&
visualBlueSize == configBlueSize )
{
// We need XRender to check the alpha channel size of the visual. If we don't have
// the alpha size, we don't check it against the EGL config's alpha size.
if (visualAlphaSize >= 0)
visualMatchesConfig = visualAlphaSize == configAlphaSize;
else
visualMatchesConfig = true;
}
if (!visualMatchesConfig) {
if (visualAlphaSize >= 0) {
qWarning("Warning: EGL suggested using X Visual ID %d (ARGB%d%d%d%d) for EGL config %d (ARGB%d%d%d%d), but this is incompatable",
(int)visualId, visualAlphaSize, visualRedSize, visualGreenSize, visualBlueSize,
configId, configAlphaSize, configRedSize, configGreenSize, configBlueSize);
} else {
qWarning("Warning: EGL suggested using X Visual ID %d (RGB%d%d%d) for EGL config %d (RGB%d%d%d), but this is incompatable",
(int)visualId, visualRedSize, visualGreenSize, visualBlueSize,
configId, configRedSize, configGreenSize, configBlueSize);
}
visualId = 0;
}
} else {
qWarning("Warning: EGL suggested using X Visual ID %d for EGL config %d, but that isn't a valid ID",
(int)visualId, configId);
visualId = 0;
}
XFree(chosenVisualInfo);
}
#ifdef QT_DEBUG_X11_VISUAL_SELECTION
else
qDebug("EGL did not suggest a VisualID (EGL_NATIVE_VISUAL_ID was zero) for EGLConfig %d", configId);
#endif
if (visualId) {
#ifdef QT_DEBUG_X11_VISUAL_SELECTION
if (configAlphaSize > 0)
qDebug("Using ARGB Visual ID %d provided by EGL for config %d", (int)visualId, configId);
else
qDebug("Using Opaque Visual ID %d provided by EGL for config %d", (int)visualId, configId);
#endif
return visualId;
}
// Finally, try to
// use XGetVisualInfo and only use the bit depths to match on:
if (!visualId) {
XVisualInfo visualInfoTemplate;
memset(&visualInfoTemplate, 0, sizeof(XVisualInfo));
XVisualInfo *matchingVisuals;
int matchingCount = 0;
visualInfoTemplate.depth = configRedSize + configGreenSize + configBlueSize + configAlphaSize;
matchingVisuals = XGetVisualInfo(display,
VisualDepthMask,
&visualInfoTemplate,
&matchingCount);
if (!matchingVisuals) {
// Try again without taking the alpha channel into account:
visualInfoTemplate.depth = configRedSize + configGreenSize + configBlueSize;
matchingVisuals = XGetVisualInfo(display,
VisualDepthMask,
&visualInfoTemplate,
&matchingCount);
}
if (matchingVisuals) {
visualId = matchingVisuals[0].visualid;
XFree(matchingVisuals);
}
}
if (visualId) {
#ifdef QT_DEBUG_X11_VISUAL_SELECTION
qDebug("Using Visual ID %d provided by XGetVisualInfo for EGL config %d", (int)visualId, configId);
#endif
return visualId;
}
qWarning("Unable to find an X11 visual which matches EGL config %d", configId);
return (VisualID)0;
}
