kwin/egl_wayland_backend.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2013 Martin Gräßlin <mgraesslin@kde.org>
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/>.
*********************************************************************/
#define WL_EGL_PLATFORM 1
#include "egl_wayland_backend.h"
// kwin
#include "composite.h"
#include "options.h"
#include "wayland_backend.h"
#include <KWayland/Client/surface.h>
#include "xcbutils.h"
// kwin libs
#include <kwinglplatform.h>
// KDE
// Qt
#include <QOpenGLContext>
namespace KWin
{
EglWaylandBackend::EglWaylandBackend()
: QObject(NULL)
, OpenGLBackend()
, m_context(EGL_NO_CONTEXT)
, m_bufferAge(0)
, m_wayland(Wayland::WaylandBackend::self())
, m_overlay(NULL)
{
if (!m_wayland) {
setFailed("Wayland Backend has not been created");
return;
}
qDebug() << "Connected to Wayland display?" << (m_wayland->display() ? "yes" : "no" );
if (!m_wayland->display()) {
setFailed("Could not connect to Wayland compositor");
return;
}
connect(m_wayland, SIGNAL(shellSurfaceSizeChanged(QSize)), SLOT(overlaySizeChanged(QSize)));
initializeEgl();
init();
// Egl is always direct rendering
setIsDirectRendering(true);
qWarning() << "Using Wayland rendering backend";
qWarning() << "This is a highly experimental backend, do not use for productive usage!";
qWarning() << "Please do not report any issues you might encounter when using this backend!";
}
EglWaylandBackend::~EglWaylandBackend()
{
cleanupGL();
checkGLError("Cleanup");
doneCurrent();
eglDestroyContext(m_display, m_context);
eglDestroySurface(m_display, m_surface);
eglTerminate(m_display);
eglReleaseThread();
if (m_overlay) {
wl_egl_window_destroy(m_overlay);
}
}
bool EglWaylandBackend::initializeEgl()
{
// Get the list of client extensions
const QByteArray clientExtensionString = eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
if (clientExtensionString.isEmpty()) {
// If eglQueryString() returned NULL, the implementation doesn't support
// EGL_EXT_client_extensions. Expect an EGL_BAD_DISPLAY error.
(void) eglGetError();
}
const QList<QByteArray> clientExtensions = clientExtensionString.split(' ');
// Use eglGetPlatformDisplayEXT() to get the display pointer
// if the implementation supports it.
m_havePlatformBase = clientExtensions.contains("EGL_EXT_platform_base");
if (m_havePlatformBase) {
// Make sure that the wayland platform is supported
if (!clientExtensions.contains("EGL_EXT_platform_wayland"))
return false;
m_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_WAYLAND_EXT, m_wayland->display(), nullptr);
} else {
m_display = eglGetDisplay(m_wayland->display());
}
if (m_display == EGL_NO_DISPLAY)
return false;
EGLint major, minor;
if (eglInitialize(m_display, &major, &minor) == EGL_FALSE)
return false;
EGLint error = eglGetError();
if (error != EGL_SUCCESS) {
qWarning() << "Error during eglInitialize " << error;
return false;
}
qDebug() << "Egl Initialize succeeded";
#ifdef KWIN_HAVE_OPENGLES
eglBindAPI(EGL_OPENGL_ES_API);
#else
if (eglBindAPI(EGL_OPENGL_API) == EGL_FALSE) {
qCritical() << "bind OpenGL API failed";
return false;
}
#endif
qDebug() << "EGL version: " << major << "." << minor;
return true;
}
void EglWaylandBackend::init()
{
if (!initRenderingContext()) {
setFailed("Could not initialize rendering context");
return;
}
initEGL();
GLPlatform *glPlatform = GLPlatform::instance();
glPlatform->detect(EglPlatformInterface);
glPlatform->printResults();
initGL(EglPlatformInterface);
setSupportsBufferAge(false);
if (hasGLExtension(QByteArrayLiteral("EGL_EXT_buffer_age"))) {
const QByteArray useBufferAge = qgetenv("KWIN_USE_BUFFER_AGE");
if (useBufferAge != "0")
setSupportsBufferAge(true);
}
}
bool EglWaylandBackend::initRenderingContext()
{
initBufferConfigs();
#ifdef KWIN_HAVE_OPENGLES
const EGLint context_attribs[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
m_context = eglCreateContext(m_display, m_config, EGL_NO_CONTEXT, context_attribs);
#else
const EGLint context_attribs_31_core[] = {
EGL_CONTEXT_MAJOR_VERSION_KHR, 3,
EGL_CONTEXT_MINOR_VERSION_KHR, 1,
EGL_CONTEXT_FLAGS_KHR, EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR,
EGL_NONE
};
const EGLint context_attribs_legacy[] = {
EGL_NONE
};
const QByteArray eglExtensions = eglQueryString(m_display, EGL_EXTENSIONS);
const QList<QByteArray> extensions = eglExtensions.split(' ');
// Try to create a 3.1 core context
if (options->glCoreProfile() && extensions.contains("EGL_KHR_create_context"))
m_context = eglCreateContext(m_display, m_config, EGL_NO_CONTEXT, context_attribs_31_core);
if (m_context == EGL_NO_CONTEXT)
m_context = eglCreateContext(m_display, m_config, EGL_NO_CONTEXT, context_attribs_legacy);
#endif
if (m_context == EGL_NO_CONTEXT) {
qCritical() << "Create Context failed";
return false;
}
if (!m_wayland->surface()) {
return false;
}
const QSize &size = m_wayland->shellSurfaceSize();
auto s = m_wayland->surface();
connect(s, &KWayland::Client::Surface::frameRendered, Compositor::self(), &Compositor::bufferSwapComplete);
m_overlay = wl_egl_window_create(*s, size.width(), size.height());
if (!m_overlay) {
qCritical() << "Creating Wayland Egl window failed";
return false;
}
if (m_havePlatformBase)
m_surface = eglCreatePlatformWindowSurfaceEXT(m_display, m_config, (void *) m_overlay, nullptr);
else
m_surface = eglCreateWindowSurface(m_display, m_config, m_overlay, nullptr);
if (m_surface == EGL_NO_SURFACE) {
qCritical() << "Create Window Surface failed";
return false;
}
return makeContextCurrent();
}
bool EglWaylandBackend::makeContextCurrent()
{
if (eglMakeCurrent(m_display, m_surface, m_surface, m_context) == EGL_FALSE) {
qCritical() << "Make Context Current failed";
return false;
}
EGLint error = eglGetError();
if (error != EGL_SUCCESS) {
qWarning() << "Error occurred while creating context " << error;
return false;
}
return true;
}
bool EglWaylandBackend::initBufferConfigs()
{
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,
#ifdef KWIN_HAVE_OPENGLES
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
#else
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
#endif
EGL_CONFIG_CAVEAT, EGL_NONE,
EGL_NONE,
};
EGLint count;
EGLConfig configs[1024];
if (eglChooseConfig(m_display, config_attribs, configs, 1, &count) == EGL_FALSE) {
qCritical() << "choose config failed";
return false;
}
if (count != 1) {
qCritical() << "choose config did not return a config" << count;
return false;
}
m_config = configs[0];
return true;
}
void EglWaylandBackend::present()
{
m_wayland->surface()->setupFrameCallback();
Compositor::self()->aboutToSwapBuffers();
if (supportsBufferAge()) {
eglSwapBuffers(m_display, m_surface);
eglQuerySurface(m_display, m_surface, EGL_BUFFER_AGE_EXT, &m_bufferAge);
setLastDamage(QRegion());
return;
} else {
eglSwapBuffers(m_display, m_surface);
setLastDamage(QRegion());
}
}
void EglWaylandBackend::screenGeometryChanged(const QSize &size)
{
Q_UNUSED(size)
// no backend specific code needed
// TODO: base implementation in OpenGLBackend
// The back buffer contents are now undefined
m_bufferAge = 0;
}
SceneOpenGL::TexturePrivate *EglWaylandBackend::createBackendTexture(SceneOpenGL::Texture *texture)
{
return new EglWaylandTexture(texture, this);
}
QRegion EglWaylandBackend::prepareRenderingFrame()
{
if (!lastDamage().isEmpty())
present();
QRegion repaint;
if (supportsBufferAge())
repaint = accumulatedDamageHistory(m_bufferAge);
eglWaitNative(EGL_CORE_NATIVE_ENGINE);
startRenderTimer();
return repaint;
}
void EglWaylandBackend::endRenderingFrame(const QRegion &renderedRegion, const QRegion &damagedRegion)
{
if (damagedRegion.isEmpty()) {
setLastDamage(QRegion());
// If the damaged region of a window is fully occluded, the only
// rendering done, if any, will have been to repair a reused back
// buffer, making it identical to the front buffer.
//
// In this case we won't post the back buffer. Instead we'll just
// set the buffer age to 1, so the repaired regions won't be
// rendered again in the next frame.
if (!renderedRegion.isEmpty())
glFlush();
m_bufferAge = 1;
return;
}
setLastDamage(renderedRegion);
if (!blocksForRetrace()) {
// This also sets lastDamage to empty which prevents the frame from
// being posted again when prepareRenderingFrame() is called.
present();
} else {
// Make sure that the GPU begins processing the command stream
// now and not the next time prepareRenderingFrame() is called.
glFlush();
}
// Save the damaged region to history
if (supportsBufferAge())
addToDamageHistory(damagedRegion);
}
bool EglWaylandBackend::makeCurrent()
{
if (QOpenGLContext *context = QOpenGLContext::currentContext()) {
// Workaround to tell Qt that no QOpenGLContext is current
context->doneCurrent();
}
const bool current = eglMakeCurrent(m_display, m_surface, m_surface, m_context);
return current;
}
void EglWaylandBackend::doneCurrent()
{
eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
}
Xcb::Shm *EglWaylandBackend::shm()
{
if (m_shm.isNull()) {
m_shm.reset(new Xcb::Shm);
}
return m_shm.data();
}
void EglWaylandBackend::overlaySizeChanged(const QSize &size)
{
wl_egl_window_resize(m_overlay, size.width(), size.height(), 0, 0);
}
bool EglWaylandBackend::usesOverlayWindow() const
{
return false;
}
/************************************************
* EglTexture
************************************************/
EglWaylandTexture::EglWaylandTexture(KWin::SceneOpenGL::Texture *texture, KWin::EglWaylandBackend *backend)
: SceneOpenGL::TexturePrivate()
, q(texture)
, m_backend(backend)
, m_referencedPixmap(XCB_PIXMAP_NONE)
{
m_target = GL_TEXTURE_2D;
}
EglWaylandTexture::~EglWaylandTexture()
{
}
OpenGLBackend *EglWaylandTexture::backend()
{
return m_backend;
}
bool EglWaylandTexture::loadTexture(xcb_pixmap_t pix, const QSize &size, xcb_visualid_t visual)
{
Q_UNUSED(visual)
// HACK: egl wayland platform doesn't support texture from X11 pixmap through the KHR_image_pixmap
// extension. To circumvent this problem we copy the pixmap content into a SHM image and from there
// to the OpenGL texture. This is a temporary solution. In future we won't need to get the content
// from X11 pixmaps. That's what we have XWayland for to get the content into a nice Wayland buffer.
if (pix == XCB_PIXMAP_NONE)
return false;
m_referencedPixmap = pix;
Xcb::Shm *shm = m_backend->shm();
if (!shm->isValid()) {
return false;
}
xcb_shm_get_image_cookie_t cookie = xcb_shm_get_image_unchecked(connection(), pix, 0, 0, size.width(),
size.height(), ~0, XCB_IMAGE_FORMAT_Z_PIXMAP, shm->segment(), 0);
glGenTextures(1, &m_texture);
q->setWrapMode(GL_CLAMP_TO_EDGE);
q->setFilter(GL_LINEAR);
q->bind();
ScopedCPointer<xcb_shm_get_image_reply_t> image(xcb_shm_get_image_reply(connection(), cookie, NULL));
if (image.isNull()) {
return false;
}
// TODO: other formats
#ifndef KWIN_HAVE_OPENGLES
glTexImage2D(m_target, 0, GL_RGBA8, size.width(), size.height(), 0,
GL_BGRA, GL_UNSIGNED_BYTE, shm->buffer());
#endif
q->unbind();
checkGLError("load texture");
q->setYInverted(true);
m_size = size;
updateMatrix();
return true;
}
bool EglWaylandTexture::update(const QRegion &damage)
{
if (m_referencedPixmap == XCB_PIXMAP_NONE) {
return false;
}
Xcb::Shm *shm = m_backend->shm();
if (!shm->isValid()) {
return false;
}
// TODO: optimize by only updating the damaged areas
const QRect &damagedRect = damage.boundingRect();
xcb_shm_get_image_cookie_t cookie = xcb_shm_get_image_unchecked(connection(), m_referencedPixmap,
damagedRect.x(), damagedRect.y(), damagedRect.width(), damagedRect.height(),
~0, XCB_IMAGE_FORMAT_Z_PIXMAP, shm->segment(), 0);
q->bind();
ScopedCPointer<xcb_shm_get_image_reply_t> image(xcb_shm_get_image_reply(connection(), cookie, NULL));
if (image.isNull()) {
return false;
}
// TODO: other formats
#ifndef KWIN_HAVE_OPENGLES
glTexSubImage2D(m_target, 0, damagedRect.x(), damagedRect.y(), damagedRect.width(), damagedRect.height(), GL_BGRA, GL_UNSIGNED_BYTE, shm->buffer());
#endif
q->unbind();
checkGLError("update texture");
return true;
}
} // namespace