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kwin/egl_wayland_backend.cpp
Martin Gräßlin 40cb4f5cd6 Map cursors from X11 to Wayland 
Tracking cursor changes in X11. Whenever the cursor image changes, the
image is read and a wl_buffer is created with the content of the X11
cursor. This buffer is attached to a surface used as a cursor image.

As a memory pool for the cursor buffers a temporary file is created and
mmapped.

All created cursors are cached but not yet removed from the cache. Some
cleanup code would be useful also to ensure that our shared memory pool
doesn't overflow.
2013-06-05 13:46:01 +02:00

968 lines
27 KiB
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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 "cursor.h"
#include "options.h"
// kwin libs
#include <kwinglplatform.h>
// KDE
#include <KDE/KDebug>
#include <KDE/KTemporaryFile>
// xcb
#include <xcb/xtest.h>
// Wayland
#include <wayland-client-protocol.h>
// system
#include <linux/input.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/types.h>
namespace KWin
{
namespace Wayland
{
/**
* Callback for announcing global objects in the registry
**/
static void registryHandleGlobal(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version)
{
Q_UNUSED(version)
WaylandBackend *d = reinterpret_cast<WaylandBackend*>(data);
if (strcmp(interface, "wl_compositor") == 0) {
d->setCompositor(reinterpret_cast<wl_compositor*>(wl_registry_bind(registry, name, &wl_compositor_interface, 1)));
} else if (strcmp(interface, "wl_shell") == 0) {
d->setShell(reinterpret_cast<wl_shell *>(wl_registry_bind(registry, name, &wl_shell_interface, 1)));
} else if (strcmp(interface, "wl_seat") == 0) {
d->createSeat(name);
} else if (strcmp(interface, "wl_shm") == 0) {
d->createShm(name);
}
kDebug(1212) << "Wayland Interface: " << interface;
}
/**
* Callback for removal of global objects in the registry
**/
static void registryHandleGlobalRemove(void *data, struct wl_registry *registry, uint32_t name)
{
Q_UNUSED(data)
Q_UNUSED(registry)
Q_UNUSED(name)
// TODO: implement me
}
/**
* Call back for ping from Wayland Shell.
**/
static void handlePing(void *data, struct wl_shell_surface *shellSurface, uint32_t serial)
{
Q_UNUSED(data)
wl_shell_surface_pong(shellSurface, serial);
}
/**
* Callback for a configure request for a shell surface
**/
static void handleConfigure(void *data, struct wl_shell_surface *shellSurface, uint32_t edges, int32_t width, int32_t height)
{
Q_UNUSED(shellSurface)
Q_UNUSED(edges)
WaylandBackend *display = reinterpret_cast<WaylandBackend*>(data);
wl_egl_window_resize(display->overlay(), width, height, 0, 0);
// TODO: this information should probably go into Screens
}
/**
* Callback for popups - not needed, we don't have popups
**/
static void handlePopupDone(void *data, struct wl_shell_surface *shellSurface)
{
Q_UNUSED(data)
Q_UNUSED(shellSurface)
}
static void seatHandleCapabilities(void *data, wl_seat *seat, uint32_t capabilities)
{
WaylandSeat *s = reinterpret_cast<WaylandSeat*>(data);
if (seat != s->seat()) {
return;
}
s->changed(capabilities);
}
static void pointerHandleEnter(void *data, wl_pointer *pointer, uint32_t serial, wl_surface *surface,
wl_fixed_t sx, wl_fixed_t sy)
{
Q_UNUSED(data)
Q_UNUSED(pointer)
Q_UNUSED(surface)
Q_UNUSED(sx)
Q_UNUSED(sy)
WaylandSeat *seat = reinterpret_cast<WaylandSeat*>(data);
seat->pointerEntered(serial);
}
static void pointerHandleLeave(void *data, wl_pointer *pointer, uint32_t serial, wl_surface *surface)
{
Q_UNUSED(data)
Q_UNUSED(pointer)
Q_UNUSED(serial)
Q_UNUSED(surface)
}
static void pointerHandleMotion(void *data, wl_pointer *pointer, uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
{
Q_UNUSED(data)
Q_UNUSED(pointer)
Q_UNUSED(time)
xcb_test_fake_input(connection(), XCB_MOTION_NOTIFY, 0, XCB_TIME_CURRENT_TIME, XCB_WINDOW_NONE,
wl_fixed_to_int(sx), wl_fixed_to_int(sy), 0);
}
static void pointerHandleButton(void *data, wl_pointer *pointer, uint32_t serial, uint32_t time,
uint32_t button, uint32_t state)
{
Q_UNUSED(data)
Q_UNUSED(pointer)
Q_UNUSED(serial)
Q_UNUSED(time)
uint8_t type = XCB_BUTTON_PRESS;
if (state == WL_POINTER_BUTTON_STATE_RELEASED) {
type = XCB_BUTTON_RELEASE;
}
// TODO: there must be a better way for mapping
uint8_t xButton = 0;
switch (button) {
case BTN_LEFT:
xButton = XCB_BUTTON_INDEX_1;
break;
case BTN_RIGHT:
xButton = XCB_BUTTON_INDEX_3;
break;
case BTN_MIDDLE:
xButton = XCB_BUTTON_INDEX_2;
break;
default:
// TODO: add more buttons
return;
}
xcb_test_fake_input(connection(), type, xButton, XCB_TIME_CURRENT_TIME, XCB_WINDOW_NONE, 0, 0, 0);
}
static void pointerHandleAxis(void *data, wl_pointer *pointer, uint32_t time, uint32_t axis, wl_fixed_t value)
{
Q_UNUSED(data)
Q_UNUSED(pointer)
Q_UNUSED(time)
uint8_t xButton = 0;
const int delta = wl_fixed_to_int(value);
if (delta == 0) {
return;
}
switch (axis) {
case WL_POINTER_AXIS_VERTICAL_SCROLL:
xButton = delta > 0 ? XCB_BUTTON_INDEX_5 : XCB_BUTTON_INDEX_4;
break;
case WL_POINTER_AXIS_HORIZONTAL_SCROLL:
// no enum values defined for buttons larger than 5
xButton = delta > 0 ? 7 : 6;
break;
default:
// doesn't exist
return;
}
for (int i = 0; i < qAbs(delta); ++i) {
xcb_test_fake_input(connection(), XCB_BUTTON_PRESS, xButton, XCB_TIME_CURRENT_TIME, XCB_WINDOW_NONE, 0, 0, 0);
xcb_test_fake_input(connection(), XCB_BUTTON_RELEASE, xButton, XCB_TIME_CURRENT_TIME, XCB_WINDOW_NONE, 0, 0, 0);
}
}
static void keyboardHandleKeymap(void *data, wl_keyboard *keyboard,
uint32_t format, int fd, uint32_t size)
{
Q_UNUSED(data)
Q_UNUSED(keyboard)
Q_UNUSED(format)
Q_UNUSED(fd)
Q_UNUSED(size)
}
static void keyboardHandleEnter(void *data, wl_keyboard *keyboard,
uint32_t serial, wl_surface *surface,
wl_array *keys)
{
Q_UNUSED(data)
Q_UNUSED(keyboard)
Q_UNUSED(serial)
Q_UNUSED(surface)
Q_UNUSED(keys)
}
static void keyboardHandleLeave(void *data, wl_keyboard *keyboard, uint32_t serial, wl_surface *surface)
{
Q_UNUSED(data)
Q_UNUSED(keyboard)
Q_UNUSED(serial)
Q_UNUSED(surface)
}
static void keyboardHandleKey(void *data, wl_keyboard *keyboard, uint32_t serial, uint32_t time,
uint32_t key, uint32_t state)
{
Q_UNUSED(data)
Q_UNUSED(keyboard)
Q_UNUSED(serial)
Q_UNUSED(time)
uint8_t type = XCB_KEY_PRESS;
if (state == WL_KEYBOARD_KEY_STATE_RELEASED) {
type = XCB_KEY_RELEASE;
}
xcb_test_fake_input(connection(), type, key + 8 /*magic*/, XCB_TIME_CURRENT_TIME, XCB_WINDOW_NONE, 0, 0, 0);
}
static void keyboardHandleModifiers(void *data, wl_keyboard *keyboard, uint32_t serial, uint32_t modsDepressed,
uint32_t modsLatched, uint32_t modsLocked, uint32_t group)
{
Q_UNUSED(data)
Q_UNUSED(keyboard)
Q_UNUSED(serial)
Q_UNUSED(modsDepressed)
Q_UNUSED(modsLatched)
Q_UNUSED(modsLocked)
Q_UNUSED(group)
}
// handlers
static const struct wl_registry_listener s_registryListener = {
registryHandleGlobal,
registryHandleGlobalRemove
};
static const struct wl_shell_surface_listener s_shellSurfaceListener = {
handlePing,
handleConfigure,
handlePopupDone
};
static const struct wl_pointer_listener s_pointerListener = {
pointerHandleEnter,
pointerHandleLeave,
pointerHandleMotion,
pointerHandleButton,
pointerHandleAxis
};
static const struct wl_keyboard_listener s_keyboardListener = {
keyboardHandleKeymap,
keyboardHandleEnter,
keyboardHandleLeave,
keyboardHandleKey,
keyboardHandleModifiers,
};
static const struct wl_seat_listener s_seatListener = {
seatHandleCapabilities
};
CursorData::CursorData(ShmPool *pool)
: m_cursor(NULL)
, m_valid(init(pool))
{
}
CursorData::~CursorData()
{
}
bool CursorData::init(ShmPool *pool)
{
QScopedPointer<xcb_xfixes_get_cursor_image_reply_t, QScopedPointerPodDeleter> cursor(
xcb_xfixes_get_cursor_image_reply(connection(),
xcb_xfixes_get_cursor_image_unchecked(connection()),
NULL));
if (cursor.isNull()) {
return false;
}
QImage cursorImage((uchar *) xcb_xfixes_get_cursor_image_cursor_image(cursor.data()), cursor->width, cursor->height,
QImage::Format_ARGB32_Premultiplied);
if (cursorImage.isNull()) {
return false;
}
m_size = QSize(cursor->width, cursor->height);
m_cursor = pool->createBuffer(cursorImage);
if (!m_cursor) {
kDebug(1212) << "Creating cursor buffer failed";
return false;
}
m_hotSpot = QPoint(cursor->xhot, cursor->yhot);
return true;
}
X11CursorTracker::X11CursorTracker(wl_pointer *pointer, WaylandBackend *backend, QObject* parent)
: QObject(parent)
, m_pointer(pointer)
, m_backend(backend)
, m_cursor(wl_compositor_create_surface(backend->compositor()))
, m_enteredSerial(0)
, m_lastX11Cursor(0)
{
Cursor::self()->startCursorTracking();
connect(Cursor::self(), SIGNAL(cursorChanged(uint32_t)), SLOT(cursorChanged(uint32_t)));
}
X11CursorTracker::~X11CursorTracker()
{
Cursor::self()->stopCursorTracking();
if (m_cursor) {
wl_surface_destroy(m_cursor);
}
}
void X11CursorTracker::cursorChanged(uint32_t serial)
{
if (m_lastX11Cursor == serial) {
// not changed;
return;
}
m_lastX11Cursor = serial;
QHash<uint32_t, CursorData>::iterator it = m_cursors.find(serial);
if (it != m_cursors.end()) {
installCursor(it.value());
return;
}
ShmPool *pool = m_backend->shmPool();
if (!pool) {
return;
}
CursorData cursor(pool);
if (cursor.isValid()) {
// TODO: discard unused cursors after some time?
m_cursors.insert(serial, cursor);
}
installCursor(cursor);
}
void X11CursorTracker::installCursor(const CursorData& cursor)
{
wl_pointer_set_cursor(m_pointer, m_enteredSerial, m_cursor, cursor.hotSpot().x(), cursor.hotSpot().y());
wl_surface_attach(m_cursor, cursor.cursor(), 0, 0);
wl_surface_damage(m_cursor, 0, 0, cursor.size().width(), cursor.size().height());
wl_surface_commit(m_cursor);
}
void X11CursorTracker::setEnteredSerial(uint32_t serial)
{
m_enteredSerial = serial;
}
ShmPool::ShmPool(wl_shm *shm)
: m_shm(shm)
, m_pool(NULL)
, m_poolData(NULL)
, m_size(1024 * 1024) // TODO: useful size?
, m_tmpFile(new KTemporaryFile())
, m_valid(createPool())
{
}
ShmPool::~ShmPool()
{
if (m_poolData) {
munmap(m_poolData, m_size);
}
if (m_pool) {
wl_shm_pool_destroy(m_pool);
}
if (m_shm) {
wl_shm_destroy(m_shm);
}
}
bool ShmPool::createPool()
{
if (!m_tmpFile->open()) {
kDebug(1212) << "Could not open temporary file for Shm pool";
return false;
}
if (ftruncate(m_tmpFile->handle(), m_size) < 0) {
kDebug(1212) << "Could not set size for Shm pool file";
return false;
}
m_poolData = mmap(NULL, m_size, PROT_READ | PROT_WRITE, MAP_SHARED, m_tmpFile->handle(), 0);
m_pool = wl_shm_create_pool(m_shm, m_tmpFile->handle(), m_size);
if (!m_poolData || !m_pool) {
kDebug(1212) << "Creating Shm pool failed";
return false;
}
m_tmpFile->close();
return true;
}
wl_buffer *ShmPool::createBuffer(const QImage& image)
{
if (image.isNull() || !m_valid) {
return NULL;
}
// TODO: test whether buffer needs resizing
wl_buffer *buffer = wl_shm_pool_create_buffer(m_pool, m_offset, image.width(), image.height(),
image.bytesPerLine(), WL_SHM_FORMAT_ARGB8888);
if (buffer) {
memcpy((char *)m_poolData + m_offset, image.bits(), image.byteCount());
m_offset += image.byteCount();
}
return buffer;
}
WaylandSeat::WaylandSeat(wl_seat *seat, WaylandBackend *backend)
: m_seat(seat)
, m_pointer(NULL)
, m_keyboard(NULL)
, m_cursorTracker()
, m_backend(backend)
{
if (m_seat) {
wl_seat_add_listener(m_seat, &s_seatListener, this);
}
}
WaylandSeat::~WaylandSeat()
{
destroyPointer();
destroyKeyboard();
if (m_seat) {
wl_seat_destroy(m_seat);
}
}
void WaylandSeat::destroyPointer()
{
if (m_pointer) {
wl_pointer_destroy(m_pointer);
m_pointer = NULL;
m_cursorTracker.reset();
}
}
void WaylandSeat::destroyKeyboard()
{
if (m_keyboard) {
wl_keyboard_destroy(m_keyboard);
m_keyboard = NULL;
}
}
void WaylandSeat::changed(uint32_t capabilities)
{
if ((capabilities & WL_SEAT_CAPABILITY_POINTER) && !m_pointer) {
m_pointer = wl_seat_get_pointer(m_seat);
wl_pointer_add_listener(m_pointer, &s_pointerListener, this);
m_cursorTracker.reset(new X11CursorTracker(m_pointer, m_backend));
} else if (!(capabilities & WL_SEAT_CAPABILITY_POINTER)) {
destroyPointer();
}
if ((capabilities & WL_SEAT_CAPABILITY_KEYBOARD)) {
m_keyboard = wl_seat_get_keyboard(m_seat);
wl_keyboard_add_listener(m_keyboard, &s_keyboardListener, this);
} else if (!(capabilities & WL_SEAT_CAPABILITY_KEYBOARD)) {
destroyKeyboard();
}
}
void WaylandSeat::pointerEntered(uint32_t serial)
{
if (m_cursorTracker.isNull()) {
return;
}
m_cursorTracker->setEnteredSerial(serial);
}
WaylandBackend::WaylandBackend()
: m_display(wl_display_connect(NULL))
, m_registry(wl_display_get_registry(m_display))
, m_compositor(NULL)
, m_shell(NULL)
, m_surface(NULL)
, m_overlay(NULL)
, m_shellSurface(NULL)
, m_seat()
, m_shm()
{
kDebug(1212) << "Created Wayland display";
// setup the registry
wl_registry_add_listener(m_registry, &s_registryListener, this);
wl_display_dispatch(m_display);
}
WaylandBackend::~WaylandBackend()
{
if (m_overlay) {
wl_egl_window_destroy(m_overlay);
}
if (m_shellSurface) {
wl_shell_surface_destroy(m_shellSurface);
}
if (m_surface) {
wl_surface_destroy(m_surface);
}
if (m_shell) {
wl_shell_destroy(m_shell);
}
if (m_compositor) {
wl_compositor_destroy(m_compositor);
}
if (m_registry) {
wl_registry_destroy(m_registry);
}
if (m_display) {
wl_display_flush(m_display);
wl_display_disconnect(m_display);
}
kDebug(1212) << "Destroyed Wayland display";
}
void WaylandBackend::createSeat(uint32_t name)
{
wl_seat *seat = reinterpret_cast<wl_seat*>(wl_registry_bind(m_registry, name, &wl_seat_interface, 1));
m_seat.reset(new WaylandSeat(seat, this));
}
bool WaylandBackend::createSurface()
{
m_surface = wl_compositor_create_surface(m_compositor);
if (!m_surface) {
kError(1212) << "Creating Wayland Surface failed";
return false;
}
// map the surface as fullscreen
m_shellSurface = wl_shell_get_shell_surface(m_shell, m_surface);
wl_shell_surface_add_listener(m_shellSurface, &s_shellSurfaceListener, this);
// TODO: do something better than displayWidth/displayHeight
m_overlay = wl_egl_window_create(m_surface, displayWidth(), displayHeight());
if (!m_overlay) {
kError(1212) << "Creating Wayland Egl window failed";
return false;
}
wl_region *region = wl_compositor_create_region(m_compositor);
wl_region_add(region, 0, 0, displayWidth(), displayHeight());
wl_surface_set_opaque_region(m_surface, region);
wl_region_destroy(region);
// wl_shell_surface_set_fullscreen(m_shellSurface, WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT, 0, NULL);
wl_shell_surface_set_toplevel(m_shellSurface);
handleConfigure(this, m_shellSurface, 0, displayWidth(), displayHeight());
return true;
}
void WaylandBackend::createShm(uint32_t name)
{
m_shm.reset(new ShmPool(reinterpret_cast<wl_shm *>(wl_registry_bind(m_registry, name, &wl_shm_interface, 1))));
if (!m_shm->isValid()) {
m_shm.reset();
}
}
}
EglWaylandBackend::EglWaylandBackend()
: OpenGLBackend()
, m_context(EGL_NO_CONTEXT)
, m_wayland(new Wayland::WaylandBackend)
{
kDebug(1212) << "Connected to Wayland display?" << (m_wayland->display() ? "yes" : "no" );
if (!m_wayland->display()) {
setFailed("Could not connect to Wayland compositor");
return;
}
initializeEgl();
init();
// Egl is always direct rendering
setIsDirectRendering(true);
}
EglWaylandBackend::~EglWaylandBackend()
{
cleanupGL();
eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
eglDestroyContext(m_display, m_context);
eglDestroySurface(m_display, m_surface);
eglTerminate(m_display);
eglReleaseThread();
}
bool EglWaylandBackend::initializeEgl()
{
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) {
kWarning(1212) << "Error during eglInitialize " << error;
return false;
}
kDebug(1212) << "Egl Initialize succeeded";
#ifdef KWIN_HAVE_OPENGLES
eglBindAPI(EGL_OPENGL_ES_API);
#else
if (eglBindAPI(EGL_OPENGL_API) == EGL_FALSE) {
kError(1212) << "bind OpenGL API failed";
return false;
}
#endif
kDebug(1212) << "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);
}
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) {
kError(1212) << "Create Context failed";
return false;
}
if (!m_wayland->createSurface()) {
return false;
}
m_surface = eglCreateWindowSurface(m_display, m_config, m_wayland->overlay(), NULL);
if (m_surface == EGL_NO_SURFACE) {
kError(1212) << "Create Window Surface failed";
return false;
}
return makeContextCurrent();
}
bool EglWaylandBackend::makeContextCurrent()
{
if (eglMakeCurrent(m_display, m_surface, m_surface, m_context) == EGL_FALSE) {
kError(1212) << "Make Context Current failed";
return false;
}
EGLint error = eglGetError();
if (error != EGL_SUCCESS) {
kWarning(1212) << "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) {
kError(1212) << "choose config failed";
return false;
}
if (count != 1) {
kError(1212) << "choose config did not return a config" << count;
return false;
}
m_config = configs[0];
return true;
}
void EglWaylandBackend::present()
{
setLastDamage(QRegion());
wl_display_dispatch_pending(m_wayland->display());
wl_display_flush(m_wayland->display());
eglSwapBuffers(m_display, m_surface);
eglWaitGL();
}
void EglWaylandBackend::screenGeometryChanged(const QSize &size)
{
Q_UNUSED(size)
// no backend specific code needed
// TODO: base implementation in OpenGLBackend
}
SceneOpenGL::TexturePrivate *EglWaylandBackend::createBackendTexture(SceneOpenGL::Texture *texture)
{
return new EglWaylandTexture(texture, this);
}
void EglWaylandBackend::prepareRenderingFrame()
{
if (!lastDamage().isEmpty())
present();
eglWaitNative(EGL_CORE_NATIVE_ENGINE);
startRenderTimer();
}
void EglWaylandBackend::endRenderingFrame(const QRegion &damage)
{
setLastDamage(damage);
glFlush();
}
Shm *EglWaylandBackend::shm()
{
if (m_shm.isNull()) {
m_shm.reset(new Shm);
}
return m_shm.data();
}
/************************************************
* 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;
}
void EglWaylandTexture::findTarget()
{
if (m_target != GL_TEXTURE_2D) {
m_target = GL_TEXTURE_2D;
}
}
bool EglWaylandTexture::loadTexture(const Pixmap &pix, const QSize &size, int depth)
{
// 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.
Q_UNUSED(depth)
if (pix == XCB_PIXMAP_NONE)
return false;
m_referencedPixmap = pix;
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;
}
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;
}
Shm::Shm()
: m_shmId(-1)
, m_buffer(NULL)
, m_segment(XCB_NONE)
, m_valid(false)
{
m_valid = init();
}
Shm::~Shm()
{
if (m_valid) {
xcb_shm_detach(connection(), m_segment);
shmdt(m_buffer);
}
}
bool Shm::init()
{
const xcb_query_extension_reply_t *ext = xcb_get_extension_data(connection(), &xcb_shm_id);
if (!ext || !ext->present) {
kDebug(1212) << "SHM extension not available";
return false;
}
ScopedCPointer<xcb_shm_query_version_reply_t> version(xcb_shm_query_version_reply(connection(),
xcb_shm_query_version_unchecked(connection()), NULL));
if (version.isNull()) {
kDebug(1212) << "Failed to get SHM extension version information";
return false;
}
const int MAXSIZE = 4096 * 2048 * 4; // TODO check there are not larger windows
m_shmId = shmget(IPC_PRIVATE, MAXSIZE, IPC_CREAT | 0600);
if (m_shmId < 0) {
kDebug(1212) << "Failed to allocate SHM segment";
return false;
}
m_buffer = shmat(m_shmId, NULL, 0 /*read/write*/);
if (-1 == reinterpret_cast<long>(m_buffer)) {
kDebug(1212) << "Failed to attach SHM segment";
shmctl(m_shmId, IPC_RMID, NULL);
return false;
}
shmctl(m_shmId, IPC_RMID, NULL);
m_segment = xcb_generate_id(connection());
const xcb_void_cookie_t cookie = xcb_shm_attach_checked(connection(), m_segment, m_shmId, false);
ScopedCPointer<xcb_generic_error_t> error(xcb_request_check(connection(), cookie));
if (!error.isNull()) {
kDebug(1212) << "xcb_shm_attach error: " << error->error_code;
shmdt(m_buffer);
return false;
}
return true;
}
} // namespace
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