f26eeb9706
Currently, the OpenGLBackend and the QPainterBackend have hooks to indicate the start and the end of compositing cycle, but in both cases, the hooks have different names. This change fixes that inconsistency.
535 lines
18 KiB
C++
535 lines
18 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2010, 2012 Martin Gräßlin <mgraesslin@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "eglonxbackend.h"
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// kwin
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#include "main.h"
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#include "options.h"
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#include "overlaywindow.h"
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#include "platform.h"
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#include "scene.h"
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#include "screens.h"
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#include "xcbutils.h"
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#include "texture.h"
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// kwin libs
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#include <kwinglplatform.h>
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#include <kwinglutils.h>
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// Qt
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#include <QLoggingCategory>
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#include <QDebug>
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#include <QOpenGLContext>
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// system
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#include <unistd.h>
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Q_LOGGING_CATEGORY(KWIN_CORE, "kwin_core", QtCriticalMsg)
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namespace KWin
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{
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EglOnXBackend::EglOnXBackend(Display *display)
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: AbstractEglBackend()
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, m_overlayWindow(kwinApp()->platform()->createOverlayWindow())
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, surfaceHasSubPost(0)
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, m_bufferAge(0)
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, m_usesOverlayWindow(true)
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, m_connection(connection())
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, m_x11Display(display)
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, m_rootWindow(rootWindow())
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, m_x11ScreenNumber(kwinApp()->x11ScreenNumber())
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{
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// Egl is always direct rendering
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setIsDirectRendering(true);
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}
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EglOnXBackend::EglOnXBackend(xcb_connection_t *connection, Display *display, xcb_window_t rootWindow, int screenNumber, xcb_window_t renderingWindow)
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: AbstractEglBackend()
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, m_overlayWindow(nullptr)
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, surfaceHasSubPost(0)
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, m_bufferAge(0)
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, m_usesOverlayWindow(false)
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, m_connection(connection)
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, m_x11Display(display)
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, m_rootWindow(rootWindow)
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, m_x11ScreenNumber(screenNumber)
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, m_renderingWindow(renderingWindow)
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{
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// Egl is always direct rendering
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setIsDirectRendering(true);
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}
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static bool gs_tripleBufferUndetected = true;
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static bool gs_tripleBufferNeedsDetection = false;
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EglOnXBackend::~EglOnXBackend()
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{
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if (isFailed() && m_overlayWindow) {
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m_overlayWindow->destroy();
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}
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cleanup();
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gs_tripleBufferUndetected = true;
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gs_tripleBufferNeedsDetection = false;
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if (m_overlayWindow) {
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if (overlayWindow()->window()) {
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overlayWindow()->destroy();
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}
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delete m_overlayWindow;
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}
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}
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void EglOnXBackend::init()
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{
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qputenv("EGL_PLATFORM", "x11");
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if (!initRenderingContext()) {
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setFailed(QStringLiteral("Could not initialize rendering context"));
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return;
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}
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initKWinGL();
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if (!hasExtension(QByteArrayLiteral("EGL_KHR_image")) &&
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(!hasExtension(QByteArrayLiteral("EGL_KHR_image_base")) ||
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!hasExtension(QByteArrayLiteral("EGL_KHR_image_pixmap")))) {
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setFailed(QStringLiteral("Required support for binding pixmaps to EGLImages not found, disabling compositing"));
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return;
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}
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if (!hasGLExtension(QByteArrayLiteral("GL_OES_EGL_image"))) {
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setFailed(QStringLiteral("Required extension GL_OES_EGL_image not found, disabling compositing"));
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return;
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}
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// check for EGL_NV_post_sub_buffer and whether it can be used on the surface
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if (hasExtension(QByteArrayLiteral("EGL_NV_post_sub_buffer"))) {
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if (eglQuerySurface(eglDisplay(), surface(), EGL_POST_SUB_BUFFER_SUPPORTED_NV, &surfaceHasSubPost) == EGL_FALSE) {
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EGLint error = eglGetError();
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if (error != EGL_SUCCESS && error != EGL_BAD_ATTRIBUTE) {
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setFailed(QStringLiteral("query surface failed"));
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return;
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} else {
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surfaceHasSubPost = EGL_FALSE;
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}
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}
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}
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setSyncsToVBlank(false);
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setBlocksForRetrace(false);
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gs_tripleBufferNeedsDetection = false;
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m_swapProfiler.init();
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if (surfaceHasSubPost) {
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qCDebug(KWIN_CORE) << "EGL implementation and surface support eglPostSubBufferNV, let's use it";
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if (options->glPreferBufferSwap() != Options::NoSwapEncourage) {
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// check if swap interval 1 is supported
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EGLint val;
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eglGetConfigAttrib(eglDisplay(), config(), EGL_MAX_SWAP_INTERVAL, &val);
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if (val >= 1) {
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if (eglSwapInterval(eglDisplay(), 1)) {
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qCDebug(KWIN_CORE) << "Enabled v-sync";
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setSyncsToVBlank(true);
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const QByteArray tripleBuffer = qgetenv("KWIN_TRIPLE_BUFFER");
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if (!tripleBuffer.isEmpty()) {
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setBlocksForRetrace(qstrcmp(tripleBuffer, "0") == 0);
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gs_tripleBufferUndetected = false;
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}
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gs_tripleBufferNeedsDetection = gs_tripleBufferUndetected;
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}
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} else {
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qCWarning(KWIN_CORE) << "Cannot enable v-sync as max. swap interval is" << val;
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}
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} else {
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// disable v-sync
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eglSwapInterval(eglDisplay(), 0);
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}
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} else {
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/* In the GLX backend, we fall back to using glCopyPixels if we have no extension providing support for partial screen updates.
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* However, that does not work in EGL - glCopyPixels with glDrawBuffer(GL_FRONT); does nothing.
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* Hence we need EGL to preserve the backbuffer for us, so that we can draw the partial updates on it and call
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* eglSwapBuffers() for each frame. eglSwapBuffers() then does the copy (no page flip possible in this mode),
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* which means it is slow and not synced to the v-blank. */
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qCWarning(KWIN_CORE) << "eglPostSubBufferNV not supported, have to enable buffer preservation - which breaks v-sync and performance";
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eglSurfaceAttrib(eglDisplay(), surface(), EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED);
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}
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initWayland();
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}
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bool EglOnXBackend::initRenderingContext()
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{
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initClientExtensions();
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EGLDisplay dpy = kwinApp()->platform()->sceneEglDisplay();
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// Use eglGetPlatformDisplayEXT() to get the display pointer
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// if the implementation supports it.
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if (dpy == EGL_NO_DISPLAY) {
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const bool havePlatformBase = hasClientExtension(QByteArrayLiteral("EGL_EXT_platform_base"));
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setHavePlatformBase(havePlatformBase);
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if (havePlatformBase) {
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// Make sure that the X11 platform is supported
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if (!hasClientExtension(QByteArrayLiteral("EGL_EXT_platform_x11")) &&
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!hasClientExtension(QByteArrayLiteral("EGL_KHR_platform_x11"))) {
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qCWarning(KWIN_CORE) << "EGL_EXT_platform_base is supported, but neither EGL_EXT_platform_x11 nor EGL_KHR_platform_x11 is supported."
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<< "Cannot create EGLDisplay on X11";
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return false;
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}
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const int attribs[] = {
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EGL_PLATFORM_X11_SCREEN_EXT, m_x11ScreenNumber,
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EGL_NONE
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};
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dpy = eglGetPlatformDisplayEXT(EGL_PLATFORM_X11_EXT, m_x11Display, attribs);
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} else {
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dpy = eglGetDisplay(m_x11Display);
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}
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}
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if (dpy == EGL_NO_DISPLAY) {
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qCWarning(KWIN_CORE) << "Failed to get the EGLDisplay";
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return false;
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}
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setEglDisplay(dpy);
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initEglAPI();
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initBufferConfigs();
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if (m_usesOverlayWindow) {
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if (!overlayWindow()->create()) {
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qCCritical(KWIN_CORE) << "Could not get overlay window";
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return false;
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} else {
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overlayWindow()->setup(None);
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}
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}
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if (!createSurfaces()) {
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qCCritical(KWIN_CORE) << "Creating egl surface failed";
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return false;
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}
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if (!createContext()) {
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qCCritical(KWIN_CORE) << "Create OpenGL context failed";
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return false;
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}
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if (!makeContextCurrent(surface())) {
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qCCritical(KWIN_CORE) << "Make Context Current failed";
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return false;
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}
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EGLint error = eglGetError();
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if (error != EGL_SUCCESS) {
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qCWarning(KWIN_CORE) << "Error occurred while creating context " << error;
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return false;
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}
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return true;
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}
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bool EglOnXBackend::createSurfaces()
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{
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xcb_window_t window = XCB_WINDOW_NONE;
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if (m_overlayWindow) {
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window = m_overlayWindow->window();
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} else if (m_renderingWindow) {
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window = m_renderingWindow;
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}
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EGLSurface surface = createSurface(window);
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if (surface == EGL_NO_SURFACE) {
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return false;
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}
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setSurface(surface);
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return true;
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}
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EGLSurface EglOnXBackend::createSurface(xcb_window_t window)
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{
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if (window == XCB_WINDOW_NONE) {
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return EGL_NO_SURFACE;
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}
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EGLSurface surface = EGL_NO_SURFACE;
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if (havePlatformBase()) {
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// Note: Window is 64 bits on a 64-bit architecture whereas xcb_window_t is
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// always 32 bits. eglCreatePlatformWindowSurfaceEXT() expects the
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// native_window parameter to be pointer to a Window, so this variable
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// cannot be an xcb_window_t.
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surface = eglCreatePlatformWindowSurfaceEXT(eglDisplay(), config(), (void *) &window, nullptr);
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} else {
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surface = eglCreateWindowSurface(eglDisplay(), config(), window, nullptr);
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}
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return surface;
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}
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bool EglOnXBackend::initBufferConfigs()
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{
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initBufferAge();
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const EGLint config_attribs[] = {
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EGL_SURFACE_TYPE, EGL_WINDOW_BIT | (supportsBufferAge() ? 0 : EGL_SWAP_BEHAVIOR_PRESERVED_BIT),
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EGL_RED_SIZE, 1,
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EGL_GREEN_SIZE, 1,
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EGL_BLUE_SIZE, 1,
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EGL_ALPHA_SIZE, 0,
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EGL_RENDERABLE_TYPE, isOpenGLES() ? EGL_OPENGL_ES2_BIT : EGL_OPENGL_BIT,
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EGL_CONFIG_CAVEAT, EGL_NONE,
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EGL_NONE,
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};
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EGLint count;
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EGLConfig configs[1024];
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if (eglChooseConfig(eglDisplay(), config_attribs, configs, 1024, &count) == EGL_FALSE) {
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qCCritical(KWIN_CORE) << "choose config failed";
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return false;
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}
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ScopedCPointer<xcb_get_window_attributes_reply_t> attribs(xcb_get_window_attributes_reply(m_connection,
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xcb_get_window_attributes_unchecked(m_connection, m_rootWindow),
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nullptr));
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if (!attribs) {
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qCCritical(KWIN_CORE) << "Failed to get window attributes of root window";
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return false;
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}
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setConfig(configs[0]);
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for (int i = 0; i < count; i++) {
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EGLint val;
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if (eglGetConfigAttrib(eglDisplay(), configs[i], EGL_NATIVE_VISUAL_ID, &val) == EGL_FALSE) {
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qCCritical(KWIN_CORE) << "egl get config attrib failed";
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}
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if (uint32_t(val) == attribs->visual) {
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setConfig(configs[i]);
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break;
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}
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}
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return true;
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}
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void EglOnXBackend::present()
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{
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if (lastDamage().isEmpty())
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return;
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presentSurface(surface(), lastDamage(), screens()->geometry());
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setLastDamage(QRegion());
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if (!supportsBufferAge()) {
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eglWaitGL();
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xcb_flush(m_connection);
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}
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}
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void EglOnXBackend::presentSurface(EGLSurface surface, const QRegion &damage, const QRect &screenGeometry)
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{
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if (damage.isEmpty()) {
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return;
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}
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const bool fullRepaint = supportsBufferAge() || (damage == screenGeometry);
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if (fullRepaint || !surfaceHasSubPost) {
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if (gs_tripleBufferNeedsDetection) {
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eglWaitGL();
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m_swapProfiler.begin();
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}
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// the entire screen changed, or we cannot do partial updates (which implies we enabled surface preservation)
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eglSwapBuffers(eglDisplay(), surface);
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if (gs_tripleBufferNeedsDetection) {
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eglWaitGL();
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if (char result = m_swapProfiler.end()) {
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gs_tripleBufferUndetected = gs_tripleBufferNeedsDetection = false;
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if (result == 'd' && GLPlatform::instance()->driver() == Driver_NVidia) {
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// TODO this is a workaround, we should get __GL_YIELD set before libGL checks it
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if (qstrcmp(qgetenv("__GL_YIELD"), "USLEEP")) {
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options->setGlPreferBufferSwap(0);
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eglSwapInterval(eglDisplay(), 0);
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result = 0; // hint proper behavior
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qCWarning(KWIN_CORE) << "\nIt seems you are using the nvidia driver without triple buffering\n"
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"You must export __GL_YIELD=\"USLEEP\" to prevent large CPU overhead on synced swaps\n"
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"Preferably, enable the TripleBuffer Option in the xorg.conf Device\n"
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"For this reason, the tearing prevention has been disabled.\n"
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"See https://bugs.kde.org/show_bug.cgi?id=322060\n";
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}
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}
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setBlocksForRetrace(result == 'd');
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}
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}
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if (supportsBufferAge()) {
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eglQuerySurface(eglDisplay(), surface, EGL_BUFFER_AGE_EXT, &m_bufferAge);
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}
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} else {
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// a part of the screen changed, and we can use eglPostSubBufferNV to copy the updated area
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for (const QRect &r : damage) {
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eglPostSubBufferNV(eglDisplay(), surface, r.left(), screenGeometry.height() - r.bottom() - 1, r.width(), r.height());
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}
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}
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}
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void EglOnXBackend::screenGeometryChanged(const QSize &size)
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{
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Q_UNUSED(size)
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// TODO: base implementation in OpenGLBackend
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// The back buffer contents are now undefined
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m_bufferAge = 0;
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}
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SceneOpenGLTexturePrivate *EglOnXBackend::createBackendTexture(SceneOpenGLTexture *texture)
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{
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return new EglTexture(texture, this);
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}
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QRegion EglOnXBackend::beginFrame(int screenId)
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{
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Q_UNUSED(screenId)
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QRegion repaint;
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if (gs_tripleBufferNeedsDetection) {
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// the composite timer floors the repaint frequency. This can pollute our triple buffering
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// detection because the glXSwapBuffers call for the new frame has to wait until the pending
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// one scanned out.
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// So we compensate for that by waiting an extra milisecond to give the driver the chance to
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// fllush the buffer queue
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usleep(1000);
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}
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present();
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if (supportsBufferAge())
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repaint = accumulatedDamageHistory(m_bufferAge);
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eglWaitNative(EGL_CORE_NATIVE_ENGINE);
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return repaint;
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}
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void EglOnXBackend::endFrame(int screenId, const QRegion &renderedRegion, const QRegion &damagedRegion)
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{
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Q_UNUSED(screenId)
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if (damagedRegion.isEmpty()) {
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setLastDamage(QRegion());
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// If the damaged region of a window is fully occluded, the only
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// rendering done, if any, will have been to repair a reused back
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// buffer, making it identical to the front buffer.
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//
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// In this case we won't post the back buffer. Instead we'll just
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// set the buffer age to 1, so the repaired regions won't be
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// rendered again in the next frame.
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if (!renderedRegion.isEmpty())
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glFlush();
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m_bufferAge = 1;
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return;
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}
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setLastDamage(renderedRegion);
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if (!blocksForRetrace()) {
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// This also sets lastDamage to empty which prevents the frame from
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// being posted again when prepareRenderingFrame() is called.
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present();
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} else {
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// Make sure that the GPU begins processing the command stream
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// now and not the next time prepareRenderingFrame() is called.
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glFlush();
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}
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if (m_overlayWindow && overlayWindow()->window()) // show the window only after the first pass,
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overlayWindow()->show(); // since that pass may take long
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// Save the damaged region to history
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if (supportsBufferAge())
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addToDamageHistory(damagedRegion);
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}
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bool EglOnXBackend::usesOverlayWindow() const
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{
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return m_usesOverlayWindow;
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}
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OverlayWindow* EglOnXBackend::overlayWindow() const
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{
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return m_overlayWindow;
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}
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bool EglOnXBackend::makeContextCurrent(const EGLSurface &surface)
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{
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return eglMakeCurrent(eglDisplay(), surface, surface, context()) == EGL_TRUE;
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}
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/************************************************
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* EglTexture
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************************************************/
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EglTexture::EglTexture(KWin::SceneOpenGLTexture *texture, KWin::EglOnXBackend *backend)
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: AbstractEglTexture(texture, backend)
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, m_backend(backend)
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{
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}
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EglTexture::~EglTexture() = default;
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bool EglTexture::loadTexture(WindowPixmap *pixmap)
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{
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// first try the Wayland enabled loading
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if (AbstractEglTexture::loadTexture(pixmap)) {
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return true;
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}
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// did not succeed, try on X11
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return loadTexture(pixmap->pixmap(), pixmap->toplevel()->bufferGeometry().size());
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}
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bool EglTexture::loadTexture(xcb_pixmap_t pix, const QSize &size)
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{
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if (!m_backend->isX11TextureFromPixmapSupported()) {
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return false;
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}
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if (pix == XCB_NONE)
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return false;
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glGenTextures(1, &m_texture);
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auto q = texture();
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q->setWrapMode(GL_CLAMP_TO_EDGE);
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q->setFilter(GL_LINEAR);
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|
q->bind();
|
|
const EGLint attribs[] = {
|
|
EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
|
|
EGL_NONE
|
|
};
|
|
setImage(eglCreateImageKHR(m_backend->eglDisplay(), EGL_NO_CONTEXT, EGL_NATIVE_PIXMAP_KHR,
|
|
(EGLClientBuffer)pix, attribs));
|
|
|
|
if (EGL_NO_IMAGE_KHR == image()) {
|
|
qCDebug(KWIN_CORE) << "failed to create egl image";
|
|
q->unbind();
|
|
q->discard();
|
|
return false;
|
|
}
|
|
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image());
|
|
q->unbind();
|
|
q->setYInverted(true);
|
|
m_size = size;
|
|
updateMatrix();
|
|
return true;
|
|
}
|
|
|
|
void KWin::EglTexture::onDamage()
|
|
{
|
|
if (options->isGlStrictBinding()) {
|
|
// This is just implemented to be consistent with
|
|
// the example in mesa/demos/src/egl/opengles1/texture_from_pixmap.c
|
|
eglWaitNative(EGL_CORE_NATIVE_ENGINE);
|
|
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES) image());
|
|
}
|
|
GLTexturePrivate::onDamage();
|
|
}
|
|
|
|
} // namespace
|