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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qxcbeglintegration.h"
#include "qxcbeglcontext.h"
#include <QtGui/QOffscreenSurface>
#include <QtGui/private/qeglconvenience_p.h>
#include <QtGui/private/qeglstreamconvenience_p.h>
#include <optional>
#include "qxcbeglnativeinterfacehandler.h"
QT_BEGIN_NAMESPACE
namespace {
struct VisualInfo
{
xcb_visualtype_t visualType;
uint8_t depth;
};
std::optional<VisualInfo> getVisualInfo(xcb_screen_t *screen,
std::optional<xcb_visualid_t> requestedVisualId,
std::optional<uint8_t> requestedDepth = std::nullopt)
{
xcb_depth_iterator_t depthIterator = xcb_screen_allowed_depths_iterator(screen);
while (depthIterator.rem) {
xcb_depth_t *depth = depthIterator.data;
xcb_visualtype_iterator_t visualTypeIterator = xcb_depth_visuals_iterator(depth);
while (visualTypeIterator.rem) {
xcb_visualtype_t *visualType = visualTypeIterator.data;
if (requestedVisualId && visualType->visual_id != *requestedVisualId) {
xcb_visualtype_next(&visualTypeIterator);
continue;
}
if (requestedDepth && depth->depth != *requestedDepth) {
xcb_visualtype_next(&visualTypeIterator);
continue;
}
return VisualInfo{ *visualType, depth->depth };
}
xcb_depth_next(&depthIterator);
}
return std::nullopt;
}
} // namespace
QXcbEglIntegration::QXcbEglIntegration()
: m_connection(nullptr)
, m_egl_display(EGL_NO_DISPLAY)
{
qCDebug(lcQpaGl) << "Xcb EGL gl-integration created";
}
QXcbEglIntegration::~QXcbEglIntegration()
{
if (m_egl_display != EGL_NO_DISPLAY)
eglTerminate(m_egl_display);
}
bool QXcbEglIntegration::initialize(QXcbConnection *connection)
{
m_connection = connection;
const char *extensions = eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
if (extensions && strstr(extensions, "EGL_EXT_platform_x11")) {
QEGLStreamConvenience streamFuncs;
m_egl_display = streamFuncs.get_platform_display(EGL_PLATFORM_X11_KHR,
xlib_display(),
nullptr);
}
if (!m_egl_display)
m_egl_display = eglGetDisplay(reinterpret_cast<EGLNativeDisplayType>(xlib_display()));
EGLint major, minor;
bool success = eglInitialize(m_egl_display, &major, &minor);
if (!success) {
m_egl_display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
qCDebug(lcQpaGl) << "Xcb EGL gl-integration retrying with display" << m_egl_display;
success = eglInitialize(m_egl_display, &major, &minor);
}
m_native_interface_handler.reset(new QXcbEglNativeInterfaceHandler(connection->nativeInterface()));
if (success)
qCDebug(lcQpaGl) << "Xcb EGL gl-integration successfully initialized";
else
qCWarning(lcQpaGl) << "Xcb EGL gl-integration initialize failed";
return success;
}
QXcbWindow *QXcbEglIntegration::createWindow(QWindow *window) const
{
return new QXcbEglWindow(window, const_cast<QXcbEglIntegration *>(this));
}
QPlatformOpenGLContext *QXcbEglIntegration::createPlatformOpenGLContext(QOpenGLContext *context) const
{
QXcbScreen *screen = static_cast<QXcbScreen *>(context->screen()->handle());
QXcbEglContext *platformContext = new QXcbEglContext(screen->surfaceFormatFor(context->format()),
context->shareHandle(),
eglDisplay());
return platformContext;
}
QOpenGLContext *QXcbEglIntegration::createOpenGLContext(EGLContext context, EGLDisplay display, QOpenGLContext *shareContext) const
{
return QEGLPlatformContext::createFrom<QXcbEglContext>(context, display, eglDisplay(), shareContext);
}
QPlatformOffscreenSurface *QXcbEglIntegration::createPlatformOffscreenSurface(QOffscreenSurface *surface) const
{
QXcbScreen *screen = static_cast<QXcbScreen *>(surface->screen()->handle());
return new QEGLPbuffer(eglDisplay(), screen->surfaceFormatFor(surface->requestedFormat()), surface);
}
void *QXcbEglIntegration::xlib_display() const
{
#if QT_CONFIG(xcb_xlib)
return m_connection->xlib_display();
#else
return EGL_DEFAULT_DISPLAY;
#endif
}
xcb_visualid_t QXcbEglIntegration::getCompatibleVisualId(xcb_screen_t *screen, EGLConfig config) const
{
xcb_visualid_t 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 = eglValue;
if (visualId) {
// EGL has suggested a visual id, so get the rest of the visual info for that id:
std::optional<VisualInfo> chosenVisualInfo = getVisualInfo(screen, visualId);
if (chosenVisualInfo) {
// Skip size checks if implementation supports non-matching visual
// and config (QTBUG-9444).
if (q_hasEglExtension(eglDisplay(), "EGL_NV_post_convert_rounding"))
return visualId;
// Skip also for i.MX6 where 565 visuals are suggested for the default 444 configs and it works just fine.
const char *vendor = eglQueryString(eglDisplay(), EGL_VENDOR);
if (vendor && strstr(vendor, "Vivante"))
return visualId;
int visualRedSize = qPopulationCount(chosenVisualInfo->visualType.red_mask);
int visualGreenSize = qPopulationCount(chosenVisualInfo->visualType.green_mask);
int visualBlueSize = qPopulationCount(chosenVisualInfo->visualType.blue_mask);
int visualAlphaSize = chosenVisualInfo->depth - visualRedSize - visualBlueSize - visualGreenSize;
const bool visualMatchesConfig = visualRedSize >= configRedSize
&& visualGreenSize >= configGreenSize
&& visualBlueSize >= configBlueSize
&& visualAlphaSize >= configAlphaSize;
// In some cases EGL tends to suggest a 24-bit visual for 8888
// configs. In such a case we have to fall back to getVisualInfo.
if (!visualMatchesConfig) {
visualId = 0;
qCDebug(lcQpaGl,
"EGL suggested using X Visual ID %d (%d %d %d %d depth %d) for EGL config %d"
"(%d %d %d %d), but this is incompatible",
visualId, visualRedSize, visualGreenSize, visualBlueSize, visualAlphaSize, chosenVisualInfo->depth,
configId, configRedSize, configGreenSize, configBlueSize, configAlphaSize);
}
} else {
qCDebug(lcQpaGl, "EGL suggested using X Visual ID %d for EGL config %d, but that isn't a valid ID",
visualId, configId);
visualId = 0;
}
}
else
qCDebug(lcQpaGl, "EGL did not suggest a VisualID (EGL_NATIVE_VISUAL_ID was zero) for EGLConfig %d", configId);
if (visualId) {
qCDebug(lcQpaGl, configAlphaSize > 0
? "Using ARGB Visual ID %d provided by EGL for config %d"
: "Using Opaque Visual ID %d provided by EGL for config %d", visualId, configId);
return visualId;
}
// Finally, try to use getVisualInfo and only use the bit depths to match on:
if (!visualId) {
uint8_t depth = configRedSize + configGreenSize + configBlueSize + configAlphaSize;
std::optional<VisualInfo> matchingVisual = getVisualInfo(screen, std::nullopt, depth);
if (!matchingVisual) {
// Try again without taking the alpha channel into account:
depth = configRedSize + configGreenSize + configBlueSize;
matchingVisual = getVisualInfo(screen, std::nullopt, depth);
}
if (matchingVisual)
visualId = matchingVisual->visualType.visual_id;
}
if (visualId) {
qCDebug(lcQpaGl, "Using Visual ID %d provided by getVisualInfo for EGL config %d", visualId, configId);
return visualId;
}
qWarning("Unable to find an X11 visual which matches EGL config %d", configId);
return 0;
}
QT_END_NAMESPACE
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