513 lines
16 KiB
C++
513 lines
16 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 "options.h"
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#include "overlaywindow.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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: OpenGLBackend()
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, m_overlayWindow(new OverlayWindow())
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, ctx(EGL_NO_CONTEXT)
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, surfaceHasSubPost(0)
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, m_bufferAge(0)
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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()
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{
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if (isFailed()) {
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m_overlayWindow->destroy();
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}
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cleanupGL();
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checkGLError("Cleanup");
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doneCurrent();
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eglDestroyContext(dpy, ctx);
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eglDestroySurface(dpy, surface);
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eglTerminate(dpy);
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eglReleaseThread();
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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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static bool gs_tripleBufferUndetected = true;
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static bool gs_tripleBufferNeedsDetection = false;
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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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initEGL();
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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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GLPlatform *glPlatform = GLPlatform::instance();
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glPlatform->detect(EglPlatformInterface);
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if (GLPlatform::instance()->driver() == Driver_Intel)
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options->setUnredirectFullscreen(false); // bug #252817
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options->setGlPreferBufferSwap(options->glPreferBufferSwap()); // resolve autosetting
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if (options->glPreferBufferSwap() == Options::AutoSwapStrategy)
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options->setGlPreferBufferSwap('e'); // for unknown drivers - should not happen
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glPlatform->printResults();
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initGL(EglPlatformInterface);
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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(dpy, 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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setSupportsBufferAge(false);
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if (hasGLExtension(QByteArrayLiteral("EGL_EXT_buffer_age"))) {
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const QByteArray useBufferAge = qgetenv("KWIN_USE_BUFFER_AGE");
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if (useBufferAge != "0")
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setSupportsBufferAge(true);
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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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qDebug() << "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(dpy, config, EGL_MAX_SWAP_INTERVAL, &val);
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if (val >= 1) {
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if (eglSwapInterval(dpy, 1)) {
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qDebug() << "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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qWarning() << "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(dpy, 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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qWarning() << "eglPostSubBufferNV not supported, have to enable buffer preservation - which breaks v-sync and performance";
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eglSurfaceAttrib(dpy, surface, EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED);
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}
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}
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bool EglOnXBackend::initRenderingContext()
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{
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dpy = eglGetDisplay(display());
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if (dpy == EGL_NO_DISPLAY)
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return false;
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EGLint major, minor;
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if (eglInitialize(dpy, &major, &minor) == EGL_FALSE)
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return false;
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#ifdef KWIN_HAVE_OPENGLES
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eglBindAPI(EGL_OPENGL_ES_API);
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#else
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if (eglBindAPI(EGL_OPENGL_API) == EGL_FALSE) {
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qCritical() << "bind OpenGL API failed";
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return false;
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}
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#endif
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initBufferConfigs();
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if (!overlayWindow()->create()) {
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qCritical() << "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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surface = eglCreateWindowSurface(dpy, config, overlayWindow()->window(), 0);
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#ifdef KWIN_HAVE_OPENGLES
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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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#endif
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if (ctx == EGL_NO_CONTEXT) {
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qCritical() << "Create Context failed";
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return false;
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}
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if (eglMakeCurrent(dpy, surface, surface, ctx) == EGL_FALSE) {
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qCritical() << "Make Context Current failed";
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return false;
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}
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qDebug() << "EGL version: " << major << "." << minor;
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EGLint error = eglGetError();
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if (error != EGL_SUCCESS) {
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qWarning() << "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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#ifdef KWIN_HAVE_OPENGLES
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EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
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#else
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EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
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#endif
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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(dpy, config_attribs, configs, 1024, &count) == EGL_FALSE) {
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qCritical() << "choose config failed";
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return false;
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}
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Xcb::WindowAttributes attribs(rootWindow());
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if (!attribs) {
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qCritical() << "Failed to get window attributes of root window";
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return false;
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}
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config = 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(dpy, configs[i], EGL_NATIVE_VISUAL_ID, &val) == EGL_FALSE) {
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qCritical() << "egl get config attrib failed";
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}
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if (uint32_t(val) == attribs->visual) {
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config = 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 QRegion displayRegion(0, 0, displayWidth(), displayHeight());
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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(dpy, 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(dpy, 0);
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qWarning() << "\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(dpy, 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(dpy, surface, r.left(), displayHeight() - 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(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 (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::makeCurrent()
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{
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if (QOpenGLContext *context = QOpenGLContext::currentContext()) {
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// Workaround to tell Qt that no QOpenGLContext is current
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context->doneCurrent();
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}
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const bool current = eglMakeCurrent(dpy, surface, surface, ctx);
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return current;
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}
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void EglOnXBackend::doneCurrent()
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{
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eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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}
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bool EglOnXBackend::usesOverlayWindow() const
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{
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return true;
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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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: SceneOpenGL::TexturePrivate()
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, q(texture)
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, m_backend(backend)
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, m_image(EGL_NO_IMAGE_KHR)
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{
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m_target = GL_TEXTURE_2D;
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}
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EglTexture::~EglTexture()
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{
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if (m_image != EGL_NO_IMAGE_KHR) {
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eglDestroyImageKHR(m_backend->dpy, m_image);
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}
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}
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OpenGLBackend *EglTexture::backend()
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{
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return m_backend;
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}
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void EglTexture::findTarget()
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{
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if (m_target != GL_TEXTURE_2D) {
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m_target = GL_TEXTURE_2D;
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}
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}
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bool EglTexture::loadTexture(const Pixmap &pix, const QSize &size, int depth)
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{
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Q_UNUSED(depth)
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if (pix == None)
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return false;
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glGenTextures(1, &m_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();
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const EGLint attribs[] = {
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EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
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EGL_NONE
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};
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m_image = eglCreateImageKHR(m_backend->dpy, EGL_NO_CONTEXT, EGL_NATIVE_PIXMAP_KHR,
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(EGLClientBuffer)pix, attribs);
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if (EGL_NO_IMAGE_KHR == m_image) {
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qDebug() << "failed to create egl image";
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q->unbind();
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q->discard();
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return false;
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}
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glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)m_image);
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q->unbind();
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checkGLError("load texture");
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q->setYInverted(true);
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m_size = size;
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updateMatrix();
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return true;
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}
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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) m_image);
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}
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GLTexturePrivate::onDamage();
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}
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} // namespace
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