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kwin/glxbackend.cpp
Fredrik Höglund baeeb1b90b kwin: Simplify GLXBackend::initRenderingContext() 
glXCreateNewContext() is supposed to return NULL on failure, so let's
assume that it does. Don't try to create an indirect context when
creating a direct context failed. glXCreateNewContext() should return
an indirect context when a direct context cannot be created.
2013-03-17 18:27:41 +01:00

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>
Copyright (C) 2012 Martin Gräßlin <mgraesslin@kde.org>
Based on glcompmgr code by Felix Bellaby.
Using code from Compiz and Beryl.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
// TODO: cmake magic
#ifndef KWIN_HAVE_OPENGLES
// own
#include "glxbackend.h"
// kwin
#include "options.h"
#include "utils.h"
#include "overlaywindow.h"
// kwin libs
#include <kwinglplatform.h>
// KDE
#include <KDE/KDebug>
#include <KDE/KXErrorHandler>
namespace KWin
{
GlxBackend::GlxBackend()
: OpenGLBackend()
, gcroot(None)
, drawable(None)
, fbconfig_db(NULL)
, fbconfig_nondb(NULL)
, fbconfig(NULL)
, glxDrawable(None)
, ctx(None)
, haveSwapInterval(false)
{
init();
}
GlxBackend::~GlxBackend()
{
// TODO: cleanup in error case
// do cleanup after initBuffer()
cleanupGL();
glXMakeCurrent(display(), None, NULL);
if (ctx)
glXDestroyContext(display(), ctx);
if (overlayWindow()->window()) {
if (glxDrawable)
glXDestroyWindow(display(), glxDrawable);
if (drawable)
XDestroyWindow(display(), drawable);
overlayWindow()->destroy();
} else {
if (glxDrawable)
glXDestroyPixmap(display(), glxDrawable);
if (gcroot)
XFreeGC(display(), gcroot);
if (drawable)
XFreePixmap(display(), drawable);
}
checkGLError("Cleanup");
}
void GlxBackend::init()
{
initGLX();
// require at least GLX 1.3
if (!hasGLXVersion(1, 3)) {
setFailed("Requires at least GLX 1.3");
return;
}
if (!initDrawableConfigs()) {
setFailed("Could not initialize the drawable configs");
return;
}
if (!initBuffer()) {
setFailed("Could not initialize the buffer");
return;
}
if (!initRenderingContext()) {
setFailed("Could not initialize rendering context");
return;
}
// Initialize OpenGL
GLPlatform *glPlatform = GLPlatform::instance();
glPlatform->detect(GlxPlatformInterface);
glPlatform->printResults();
initGL(GlxPlatformInterface);
// Check whether certain features are supported
haveSwapInterval = glXSwapIntervalMESA || glXSwapIntervalEXT || glXSwapIntervalSGI;
if (options->isGlVSync()) {
if (glXGetVideoSync && haveSwapInterval && glXIsDirect(display(), ctx)) {
unsigned int sync;
if (glXGetVideoSync(&sync) == 0) {
if (glXWaitVideoSync(1, 0, &sync) == 0) {
// NOTICE at this time we should actually check whether we can successfully
// deactivate the swapInterval "glXSwapInterval(0) == 0"
// (because we don't actually want it active unless we explicitly run a glXSwapBuffers)
// However mesa/dri will return a range error (6) because deactivating the
// swapinterval (as of today) seems completely unsupported
setHasWaitSync(true);
setSwapInterval(1);
}
else
qWarning() << "NO VSYNC! glXWaitVideoSync(1,0,&uint) isn't 0 but" << glXWaitVideoSync(1, 0, &sync);
} else
qWarning() << "NO VSYNC! glXGetVideoSync(&uint) isn't 0 but" << glXGetVideoSync(&sync);
} else
qWarning() << "NO VSYNC! glXGetVideoSync, haveSwapInterval, glXIsDirect" <<
bool(glXGetVideoSync) << haveSwapInterval << glXIsDirect(display(), ctx);
}
if (glPlatform->isVirtualBox()) {
// VirtualBox does not support glxQueryDrawable
// this should actually be in kwinglutils_funcs, but QueryDrawable seems not to be provided by an extension
// and the GLPlatform has not been initialized at the moment when initGLX() is called.
glXQueryDrawable = NULL;
}
setIsDirectRendering(bool(glXIsDirect(display(), ctx)));
kDebug(1212) << "DB:" << isDoubleBuffer() << ", Direct:" << isDirectRendering() << endl;
}
bool GlxBackend::initRenderingContext()
{
bool direct = options->isGlDirect();
ctx = glXCreateNewContext(display(), fbconfig, GLX_RGBA_TYPE, NULL, direct);
if (!ctx) {
kDebug(1212) << "Failed to create an OpenGL context.";
return false;
}
if (!glXMakeCurrent(display(), glxDrawable, ctx)) {
kDebug(1212) << "Failed to make the OpenGL context current.";
glXDestroyContext(display(), ctx);
ctx = 0;
return false;
}
return true;
}
bool GlxBackend::initBuffer()
{
if (!initFbConfig())
return false;
if (fbconfig_db != NULL && overlayWindow()->create()) {
// we have overlay, try to create double-buffered window in it
fbconfig = fbconfig_db;
XVisualInfo* visual = glXGetVisualFromFBConfig(display(), fbconfig);
XSetWindowAttributes attrs;
attrs.colormap = XCreateColormap(display(), rootWindow(), visual->visual, AllocNone);
drawable = XCreateWindow(display(), overlayWindow()->window(), 0, 0, displayWidth(), displayHeight(),
0, visual->depth, InputOutput, visual->visual, CWColormap, &attrs);
glxDrawable = glXCreateWindow(display(), fbconfig, drawable, NULL);
overlayWindow()->setup(drawable);
setDoubleBuffer(true);
XFree(visual);
} else if (fbconfig_nondb != NULL) {
// cannot get any double-buffered drawable, will double-buffer using a pixmap
fbconfig = fbconfig_nondb;
XVisualInfo* visual = glXGetVisualFromFBConfig(display(), fbconfig);
XGCValues gcattr;
gcattr.subwindow_mode = IncludeInferiors;
gcroot = XCreateGC(display(), rootWindow(), GCSubwindowMode, &gcattr);
drawable = XCreatePixmap(display(), rootWindow(), displayWidth(), displayHeight(),
visual->depth);
glxDrawable = glXCreatePixmap(display(), fbconfig, drawable, NULL);
setDoubleBuffer(false);
XFree(visual);
} else {
kError(1212) << "Couldn't create output buffer (failed to create overlay window?) !";
return false; // error
}
int vis_buffer;
glXGetFBConfigAttrib(display(), fbconfig, GLX_VISUAL_ID, &vis_buffer);
XVisualInfo* visinfo_buffer = glXGetVisualFromFBConfig(display(), fbconfig);
kDebug(1212) << "Buffer visual (depth " << visinfo_buffer->depth << "): 0x" << QString::number(vis_buffer, 16);
XFree(visinfo_buffer);
return true;
}
bool GlxBackend::initFbConfig()
{
int attribs[] = {
GLX_RENDER_TYPE, GLX_RGBA_TYPE,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_ALPHA_SIZE, 0,
GLX_DEPTH_SIZE, 0,
GLX_STENCIL_SIZE, 0,
GLX_CONFIG_CAVEAT, GLX_NONE,
GLX_DOUBLEBUFFER, true,
0
};
fbconfig_db = NULL;
fbconfig_nondb = NULL;
// Try to find a double buffered configuration
int count = 0;
GLXFBConfig *configs = glXChooseFBConfig(display(), DefaultScreen(display()), attribs, &count);
if (count > 0) {
fbconfig_db = configs[0];
XFree(configs);
}
// Try to find a single buffered configuration
attribs[18] = false;
configs = glXChooseFBConfig(display(), DefaultScreen(display()), attribs, &count);
if (count > 0) {
fbconfig_nondb = configs[0];
XFree(configs);
}
if (fbconfig_db == NULL && fbconfig_nondb == NULL) {
kError(1212) << "Failed to find a usable framebuffer configuration";
return false;
}
return true;
}
bool GlxBackend::initDrawableConfigs()
{
int cnt;
GLXFBConfig *fbconfigs = glXGetFBConfigs(display(), DefaultScreen(display()), &cnt);
for (int i = 0; i <= 32; i++) {
int back, stencil, depth, caveat, alpha, mipmap, rgba;
back = INT_MAX;
stencil = INT_MAX;
depth = INT_MAX;
caveat = INT_MAX;
mipmap = 0;
rgba = 0;
fbcdrawableinfo[ i ].fbconfig = NULL;
fbcdrawableinfo[ i ].bind_texture_format = 0;
fbcdrawableinfo[ i ].texture_targets = 0;
fbcdrawableinfo[ i ].y_inverted = 0;
fbcdrawableinfo[ i ].mipmap = 0;
for (int j = 0; j < cnt; j++) {
XVisualInfo *vi;
int visual_depth;
vi = glXGetVisualFromFBConfig(display(), fbconfigs[ j ]);
if (vi == NULL)
continue;
visual_depth = vi->depth;
XFree(vi);
if (visual_depth != i)
continue;
int value;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_ALPHA_SIZE, &alpha);
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_BUFFER_SIZE, &value);
if (value != i && (value - alpha) != i)
continue;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_RENDER_TYPE, &value);
if (!(value & GLX_RGBA_BIT))
continue;
value = 0;
if (i == 32) {
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_BIND_TO_TEXTURE_RGBA_EXT, &value);
if (value) {
// TODO I think this should be set only after the config passes all tests
rgba = 1;
fbcdrawableinfo[ i ].bind_texture_format = GLX_TEXTURE_FORMAT_RGBA_EXT;
}
}
if (!value) {
if (rgba)
continue;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_BIND_TO_TEXTURE_RGB_EXT, &value);
if (!value)
continue;
fbcdrawableinfo[ i ].bind_texture_format = GLX_TEXTURE_FORMAT_RGB_EXT;
}
int back_value;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_DOUBLEBUFFER, &back_value);
if (back_value > back)
continue;
int stencil_value;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_STENCIL_SIZE, &stencil_value);
if (stencil_value > stencil)
continue;
int depth_value;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_DEPTH_SIZE, &depth_value);
if (depth_value > depth)
continue;
int caveat_value;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_CONFIG_CAVEAT, &caveat_value);
if (caveat_value > caveat)
continue;
// ok, config passed all tests, it's the best one so far
fbcdrawableinfo[ i ].fbconfig = fbconfigs[ j ];
caveat = caveat_value;
back = back_value;
stencil = stencil_value;
depth = depth_value;
mipmap = 0;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_BIND_TO_TEXTURE_TARGETS_EXT, &value);
fbcdrawableinfo[ i ].texture_targets = value;
glXGetFBConfigAttrib(display(), fbconfigs[ j ],
GLX_Y_INVERTED_EXT, &value);
fbcdrawableinfo[ i ].y_inverted = value;
fbcdrawableinfo[ i ].mipmap = mipmap;
}
}
if (cnt)
XFree(fbconfigs);
if (fbcdrawableinfo[ DefaultDepth(display(), DefaultScreen(display()))].fbconfig == NULL) {
kError(1212) << "Couldn't find framebuffer configuration for default depth!";
return false;
}
if (fbcdrawableinfo[ 32 ].fbconfig == NULL) {
kError(1212) << "Couldn't find framebuffer configuration for depth 32 (no ARGB GLX visual)!";
return false;
}
for (int i = 0; i <= 32; i++) {
if (fbcdrawableinfo[i].fbconfig == NULL)
continue;
int vis_drawable = 0;
glXGetFBConfigAttrib(display(), fbcdrawableinfo[i].fbconfig, GLX_VISUAL_ID, &vis_drawable);
kDebug(1212) << "Drawable visual (depth " << i << "): 0x" << QString::number(vis_drawable, 16);
}
return true;
}
void GlxBackend::setSwapInterval(int interval)
{
if (glXSwapIntervalEXT)
glXSwapIntervalEXT(display(), glxDrawable, interval);
else if (glXSwapIntervalMESA)
glXSwapIntervalMESA(interval);
else if (glXSwapIntervalSGI)
glXSwapIntervalSGI(interval);
}
#define VSYNC_DEBUG 0
void GlxBackend::waitSync()
{
// NOTE that vsync has no effect with indirect rendering
if (waitSyncAvailable()) {
#if VSYNC_DEBUG
startRenderTimer();
#endif
uint sync;
#if 0
// TODO: why precisely is this important?
// the sync counter /can/ perform multiple steps during glXGetVideoSync & glXWaitVideoSync
// but this only leads to waiting for two frames??!?
glXGetVideoSync(&sync);
glXWaitVideoSync(2, (sync + 1) % 2, &sync);
#else
glXWaitVideoSync(1, 0, &sync);
#endif
#if VSYNC_DEBUG
static int waitTime = 0, waitCounter = 0, doubleSyncCounter = 0;
if (renderTime() > 11)
++doubleSyncCounter;
waitTime += renderTime();
++waitCounter;
if (waitCounter > 99)
{
qDebug() << "mean vsync wait time:" << float((float)waitTime / (float)waitCounter) << doubleSyncCounter << "/100";
doubleSyncCounter = waitTime = waitCounter = 0;
}
#endif
}
startRenderTimer(); // yes, the framerate shall be constant anyway.
}
#undef VSYNC_DEBUG
void GlxBackend::present()
{
if (isDoubleBuffer()) {
const QRegion displayRegion(0, 0, displayWidth(), displayHeight());
const bool fullRepaint = (lastDamage() == displayRegion);
if (fullRepaint) {
if (haveSwapInterval) {
glXSwapBuffers(display(), glxDrawable);
startRenderTimer();
} else {
waitSync(); // calls startRenderTimer();
glXSwapBuffers(display(), glxDrawable);
}
} else if (glXCopySubBuffer) {
waitSync();
foreach (const QRect & r, lastDamage().rects()) {
// convert to OpenGL coordinates
int y = displayHeight() - r.y() - r.height();
glXCopySubBuffer(display(), glxDrawable, r.x(), y, r.width(), r.height());
}
} else { // Copy Pixels
// if a shader is bound or the texture unit is enabled, copy pixels results in a black screen
// therefore unbind the shader and restore after copying the pixels
GLint shader = 0;
if (ShaderManager::instance()->isShaderBound()) {
glGetIntegerv(GL_CURRENT_PROGRAM, &shader);
glUseProgram(0);
}
bool reenableTexUnit = false;
if (glIsEnabled(GL_TEXTURE_2D)) {
glDisable(GL_TEXTURE_2D);
reenableTexUnit = true;
}
// no idea why glScissor() is used, but Compiz has it and it doesn't seem to hurt
glEnable(GL_SCISSOR_TEST);
glDrawBuffer(GL_FRONT);
waitSync();
int xpos = 0;
int ypos = 0;
foreach (const QRect & r, lastDamage().rects()) {
// convert to OpenGL coordinates
int y = displayHeight() - r.y() - r.height();
// Move raster position relatively using glBitmap() rather
// than using glRasterPos2f() - the latter causes drawing
// artefacts at the bottom screen edge with some gfx cards
// glRasterPos2f( r.x(), r.y() + r.height());
glBitmap(0, 0, 0, 0, r.x() - xpos, y - ypos, NULL);
xpos = r.x();
ypos = y;
glScissor(r.x(), y, r.width(), r.height());
glCopyPixels(r.x(), y, r.width(), r.height(), GL_COLOR);
}
glBitmap(0, 0, 0, 0, -xpos, -ypos, NULL); // move position back to 0,0
glDrawBuffer(GL_BACK);
glDisable(GL_SCISSOR_TEST);
if (reenableTexUnit) {
glEnable(GL_TEXTURE_2D);
}
// rebind previously bound shader
if (ShaderManager::instance()->isShaderBound()) {
glUseProgram(shader);
}
}
glXWaitGL();
} else {
glXWaitGL();
foreach (const QRect & r, lastDamage().rects())
XCopyArea(display(), drawable, rootWindow(), gcroot, r.x(), r.y(), r.width(), r.height(), r.x(), r.y());
}
setLastDamage(QRegion());
XFlush(display());
}
void GlxBackend::screenGeometryChanged(const QSize &size)
{
if (overlayWindow()->window() == None) {
glXMakeCurrent(display(), None, NULL);
glXDestroyPixmap(display(), glxDrawable);
XFreePixmap(display(), drawable);
XVisualInfo* visual = glXGetVisualFromFBConfig(display(), fbconfig);
drawable = XCreatePixmap(display(), rootWindow(), size.width(), size.height(), visual->depth);
XFree(visual);
glxDrawable = glXCreatePixmap(display(), fbconfig, drawable, NULL);
glXMakeCurrent(display(), glxDrawable, ctx);
// TODO: there seems some bug, some clients become black until an eg. un/remap - could be a general pixmap buffer issue, though
} else {
glXMakeCurrent(display(), None, NULL); // deactivate context ////
XMoveResizeWindow(display(), drawable, 0,0, size.width(), size.height());
overlayWindow()->setup(drawable);
XSync(display(), false); // ensure X11 stuff has applied ////
glXMakeCurrent(display(), glxDrawable, ctx); // reactivate context ////
glViewport(0,0, size.width(), size.height()); // adjust viewport last - should btw. be superfluous on the Pixmap buffer - iirc glXCreatePixmap sets the context anyway. ////
}
}
SceneOpenGL::TexturePrivate *GlxBackend::createBackendTexture(SceneOpenGL::Texture *texture)
{
return new GlxTexture(texture, this);
}
void GlxBackend::prepareRenderingFrame()
{
if (!lastDamage().isEmpty())
present();
glXWaitX();
}
void GlxBackend::endRenderingFrame(const QRegion &damage)
{
setLastDamage(damage);
glFlush();
if (overlayWindow()->window()) // show the window only after the first pass,
overlayWindow()->show(); // since that pass may take long
}
/********************************************************
* GlxTexture
*******************************************************/
GlxTexture::GlxTexture(SceneOpenGL::Texture *texture, GlxBackend *backend)
: SceneOpenGL::TexturePrivate()
, q(texture)
, m_backend(backend)
, m_glxpixmap(None)
{
}
GlxTexture::~GlxTexture()
{
if (m_glxpixmap != None) {
if (!options->isGlStrictBinding()) {
glXReleaseTexImageEXT(display(), m_glxpixmap, GLX_FRONT_LEFT_EXT);
}
glXDestroyPixmap(display(), m_glxpixmap);
m_glxpixmap = None;
}
}
void GlxTexture::onDamage()
{
if (options->isGlStrictBinding() && m_glxpixmap) {
glXReleaseTexImageEXT(display(), m_glxpixmap, GLX_FRONT_LEFT_EXT);
glXBindTexImageEXT(display(), m_glxpixmap, GLX_FRONT_LEFT_EXT, NULL);
}
GLTexturePrivate::onDamage();
}
void GlxTexture::findTarget()
{
unsigned int new_target = 0;
if (glXQueryDrawable && m_glxpixmap != None)
glXQueryDrawable(display(), m_glxpixmap, GLX_TEXTURE_TARGET_EXT, &new_target);
// HACK: this used to be a hack for Xgl.
// without this hack the NVIDIA blob aborts when trying to bind a texture from
// a pixmap icon
if (new_target == 0) {
if (GLTexture::NPOTTextureSupported() ||
(isPowerOfTwo(m_size.width()) && isPowerOfTwo(m_size.height()))) {
new_target = GLX_TEXTURE_2D_EXT;
} else {
new_target = GLX_TEXTURE_RECTANGLE_EXT;
}
}
switch(new_target) {
case GLX_TEXTURE_2D_EXT:
m_target = GL_TEXTURE_2D;
m_scale.setWidth(1.0f / m_size.width());
m_scale.setHeight(1.0f / m_size.height());
break;
case GLX_TEXTURE_RECTANGLE_EXT:
m_target = GL_TEXTURE_RECTANGLE_ARB;
m_scale.setWidth(1.0f);
m_scale.setHeight(1.0f);
break;
default:
abort();
}
}
bool GlxTexture::loadTexture(const Pixmap& pix, const QSize& size, int depth)
{
#ifdef CHECK_GL_ERROR
checkGLError("TextureLoad1");
#endif
if (pix == None || size.isEmpty() || depth < 1)
return false;
if (m_backend->fbcdrawableinfo[ depth ].fbconfig == NULL) {
kDebug(1212) << "No framebuffer configuration for depth " << depth
<< "; not binding pixmap" << endl;
return false;
}
m_size = size;
// new texture, or texture contents changed; mipmaps now invalid
q->setDirty();
#ifdef CHECK_GL_ERROR
checkGLError("TextureLoad2");
#endif
// tfp mode, simply bind the pixmap to texture
glGenTextures(1, &m_texture);
// The GLX pixmap references the contents of the original pixmap, so it doesn't
// need to be recreated when the contents change.
// The texture may or may not use the same storage depending on the EXT_tfp
// implementation. When options->glStrictBinding is true, the texture uses
// a different storage and needs to be updated with a call to
// glXBindTexImageEXT() when the contents of the pixmap has changed.
int attrs[] = {
GLX_TEXTURE_FORMAT_EXT, m_backend->fbcdrawableinfo[ depth ].bind_texture_format,
GLX_MIPMAP_TEXTURE_EXT, m_backend->fbcdrawableinfo[ depth ].mipmap > 0,
None, None, None
};
// Specifying the texture target explicitly is reported to cause a performance
// regression with R300G (see bug #256654).
if (GLPlatform::instance()->driver() != Driver_R300G) {
if ((m_backend->fbcdrawableinfo[ depth ].texture_targets & GLX_TEXTURE_2D_BIT_EXT) &&
(GLTexture::NPOTTextureSupported() ||
(isPowerOfTwo(size.width()) && isPowerOfTwo(size.height())))) {
attrs[ 4 ] = GLX_TEXTURE_TARGET_EXT;
attrs[ 5 ] = GLX_TEXTURE_2D_EXT;
} else if (m_backend->fbcdrawableinfo[ depth ].texture_targets & GLX_TEXTURE_RECTANGLE_BIT_EXT) {
attrs[ 4 ] = GLX_TEXTURE_TARGET_EXT;
attrs[ 5 ] = GLX_TEXTURE_RECTANGLE_EXT;
}
}
m_glxpixmap = glXCreatePixmap(display(), m_backend->fbcdrawableinfo[ depth ].fbconfig, pix, attrs);
#ifdef CHECK_GL_ERROR
checkGLError("TextureLoadTFP1");
#endif
findTarget();
m_yInverted = m_backend->fbcdrawableinfo[ depth ].y_inverted ? true : false;
m_canUseMipmaps = m_backend->fbcdrawableinfo[ depth ].mipmap > 0;
q->setFilter(m_backend->fbcdrawableinfo[ depth ].mipmap > 0 ? GL_NEAREST_MIPMAP_LINEAR : GL_NEAREST);
glBindTexture(m_target, m_texture);
#ifdef CHECK_GL_ERROR
checkGLError("TextureLoadTFP2");
#endif
glXBindTexImageEXT(display(), m_glxpixmap, GLX_FRONT_LEFT_EXT, NULL);
#ifdef CHECK_GL_ERROR
checkGLError("TextureLoad0");
#endif
unbind();
return true;
}
OpenGLBackend *GlxTexture::backend()
{
return m_backend;
}
} // namespace
#endif
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