0788890233
and also hint the proper blocking condition (if turning off swap control) The detection vars are global, but the swap control requirement is not preserved, so the detection must re-occur. Alternatively (and better) the swap control should be saved and re-applied, but there's trouble on initial detection CCBUG: 343184 REVIEW: 125659
488 lines
17 KiB
C++
488 lines
17 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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Copyright (C) 2010, 2012 Martin Gräßlin <mgraesslin@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 "screens.h"
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#include "xcbutils.h"
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// kwin libs
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#include <kwinglplatform.h>
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// Qt
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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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namespace KWin
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{
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EglOnXBackend::EglOnXBackend()
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: AbstractEglBackend()
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, m_overlayWindow(new OverlayWindow())
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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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init();
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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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init();
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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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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 (!hasGLExtension(QByteArrayLiteral("EGL_KHR_image")) &&
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(!hasGLExtension(QByteArrayLiteral("EGL_KHR_image_base")) ||
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!hasGLExtension(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 (hasGLExtension(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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initBufferAge();
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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;
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// Use eglGetPlatformDisplayEXT() to get the display pointer
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// if the implementation supports it.
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const bool havePlatformBase = hasClientExtension(QByteArrayLiteral("EGL_EXT_platform_base"));
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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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return false;
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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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if (dpy == EGL_NO_DISPLAY)
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return false;
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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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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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if (window == XCB_WINDOW_NONE) {
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return false;
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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(dpy, config(), (void *) &window, nullptr);
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} else {
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surface = eglCreateWindowSurface(dpy, config(), window, nullptr);
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}
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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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EGLContext ctx = EGL_NO_CONTEXT;
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if (isOpenGLES()) {
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const EGLint context_attribs[] = {
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EGL_CONTEXT_CLIENT_VERSION, 2,
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EGL_NONE
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};
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ctx = eglCreateContext(dpy, config(), EGL_NO_CONTEXT, context_attribs);
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} else {
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const EGLint context_attribs_31_core[] = {
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EGL_CONTEXT_MAJOR_VERSION_KHR, 3,
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EGL_CONTEXT_MINOR_VERSION_KHR, 1,
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EGL_NONE
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};
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const EGLint context_attribs_legacy[] = {
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EGL_NONE
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};
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const QByteArray eglExtensions = eglQueryString(dpy, EGL_EXTENSIONS);
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const QList<QByteArray> extensions = eglExtensions.split(' ');
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// Try to create a 3.1 core context
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if (options->glCoreProfile() && extensions.contains("EGL_KHR_create_context"))
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ctx = eglCreateContext(dpy, config(), EGL_NO_CONTEXT, context_attribs_31_core);
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if (ctx == EGL_NO_CONTEXT)
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ctx = eglCreateContext(dpy, config(), EGL_NO_CONTEXT, context_attribs_legacy);
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}
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if (ctx == EGL_NO_CONTEXT) {
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qCCritical(KWIN_CORE) << "Create Context failed";
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return false;
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}
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setContext(ctx);
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if (eglMakeCurrent(dpy, surface, surface, ctx) == EGL_FALSE) {
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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::initBufferConfigs()
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{
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const EGLint config_attribs[] = {
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EGL_SURFACE_TYPE, EGL_WINDOW_BIT|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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const QSize screenSize = screens()->size();
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const QRegion displayRegion(0, 0, screenSize.width(), screenSize.height());
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const bool fullRepaint = supportsBufferAge() || (lastDamage() == displayRegion);
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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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foreach (const QRect & r, lastDamage().rects()) {
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eglPostSubBufferNV(eglDisplay(), surface(), r.left(), screenSize.height() - r.bottom() - 1, r.width(), r.height());
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}
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}
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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::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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SceneOpenGL::TexturePrivate *EglOnXBackend::createBackendTexture(SceneOpenGL::Texture *texture)
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{
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return new EglTexture(texture, this);
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}
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QRegion EglOnXBackend::prepareRenderingFrame()
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{
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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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startRenderTimer();
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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::endRenderingFrame(const QRegion &renderedRegion, const QRegion &damagedRegion)
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{
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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()
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{
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return m_overlayWindow;
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}
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/************************************************
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* EglTexture
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************************************************/
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EglTexture::EglTexture(KWin::SceneOpenGL::Texture *texture, KWin::EglOnXBackend *backend)
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: AbstractEglTexture(texture, backend)
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{
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}
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EglTexture::~EglTexture() = default;
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void KWin::EglTexture::onDamage()
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{
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if (options->isGlStrictBinding()) {
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// This is just implemented to be consistent with
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// the example in mesa/demos/src/egl/opengles1/texture_from_pixmap.c
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eglWaitNative(EGL_CORE_NATIVE_ENGINE);
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glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES) image());
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}
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GLTexturePrivate::onDamage();
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}
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} // namespace
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