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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <qlibrary.h>
#include <qdebug.h>
#include <private/qgl_p.h>
#include <private/qt_x11_p.h>
#include <private/qpaintengine_opengl_p.h>
#include <qx11info_x11.h>
#include <GL/glx.h>
#include <qimage.h>
#include "qglpixelbuffer.h"
#include "qglpixelbuffer_p.h"
#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
#include <dlfcn.h>
#endif
QT_BEGIN_NAMESPACE
#ifndef GLX_VERSION_1_3
#define GLX_RGBA_BIT 0x00000002
#define GLX_PBUFFER_BIT 0x00000004
#define GLX_DRAWABLE_TYPE 0x8010
#define GLX_RENDER_TYPE 0x8011
#define GLX_RGBA_TYPE 0x8014
#define GLX_PBUFFER_HEIGHT 0x8040
#define GLX_PBUFFER_WIDTH 0x8041
#endif
#ifndef GLX_ARB_multisample
#define GLX_SAMPLE_BUFFERS_ARB 100000
#define GLX_SAMPLES_ARB 100001
#endif
typedef GLXFBConfig* (*_glXChooseFBConfig) (Display *dpy, int screen, const int *attrib_list, int *nelements);
typedef int (*_glXGetFBConfigAttrib) (Display *dpy, GLXFBConfig config, int attribute, int *value);
typedef GLXPbuffer (*_glXCreatePbuffer) (Display *dpy, GLXFBConfig config, const int *attrib_list);
typedef void (*_glXDestroyPbuffer) (Display *dpy, GLXPbuffer pbuf);
typedef GLXContext (*_glXCreateNewContext) (Display *dpy, GLXFBConfig config, int render_type, GLXContext share_list, Bool direct);
typedef Bool (*_glXMakeContextCurrent) (Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx);
static _glXChooseFBConfig qt_glXChooseFBConfig = 0;
static _glXCreateNewContext qt_glXCreateNewContext = 0;
static _glXCreatePbuffer qt_glXCreatePbuffer = 0;
static _glXDestroyPbuffer qt_glXDestroyPbuffer = 0;
static _glXGetFBConfigAttrib qt_glXGetFBConfigAttrib = 0;
static _glXMakeContextCurrent qt_glXMakeContextCurrent = 0;
#define glXChooseFBConfig qt_glXChooseFBConfig
#define glXCreateNewContext qt_glXCreateNewContext
#define glXCreatePbuffer qt_glXCreatePbuffer
#define glXDestroyPbuffer qt_glXDestroyPbuffer
#define glXGetFBConfigAttrib qt_glXGetFBConfigAttrib
#define glXMakeContextCurrent qt_glXMakeContextCurrent
extern void* qglx_getProcAddress(const char* procName); // in qgl_x11.cpp
static bool qt_resolve_pbuffer_extensions()
{
static int resolved = false;
if (resolved && qt_glXMakeContextCurrent)
return true;
else if (resolved)
return false;
qt_glXChooseFBConfig = (_glXChooseFBConfig) qglx_getProcAddress("glXChooseFBConfig");
qt_glXCreateNewContext = (_glXCreateNewContext) qglx_getProcAddress("glXCreateNewContext");
qt_glXCreatePbuffer = (_glXCreatePbuffer) qglx_getProcAddress("glXCreatePbuffer");
qt_glXDestroyPbuffer = (_glXDestroyPbuffer) qglx_getProcAddress("glXDestroyPbuffer");
qt_glXGetFBConfigAttrib = (_glXGetFBConfigAttrib) qglx_getProcAddress("glXGetFBConfigAttrib");
qt_glXMakeContextCurrent = (_glXMakeContextCurrent) qglx_getProcAddress("glXMakeContextCurrent");
resolved = qt_glXMakeContextCurrent ? true : false;
return resolved;
}
static void qt_format_to_attrib_list(const QGLFormat &f, int attribs[])
{
int i = 0;
attribs[i++] = GLX_RENDER_TYPE;
attribs[i++] = GLX_RGBA_BIT;
attribs[i++] = GLX_DRAWABLE_TYPE;
attribs[i++] = GLX_PBUFFER_BIT;
attribs[i++] = GLX_RED_SIZE;
attribs[i++] = f.redBufferSize() == -1 ? 1 : f.redBufferSize();
attribs[i++] = GLX_GREEN_SIZE;
attribs[i++] = f.greenBufferSize() == -1 ? 1 : f.greenBufferSize();
attribs[i++] = GLX_BLUE_SIZE;
attribs[i++] = f.blueBufferSize() == -1 ? 1 : f.blueBufferSize();
if (f.doubleBuffer()) {
attribs[i++] = GLX_DOUBLEBUFFER;
attribs[i++] = true;
}
if (f.depth()) {
attribs[i++] = GLX_DEPTH_SIZE;
attribs[i++] = f.depthBufferSize() == -1 ? 1 : f.depthBufferSize();
}
if (f.stereo()) {
attribs[i++] = GLX_STEREO;
attribs[i++] = true;
}
if (f.stencil()) {
attribs[i++] = GLX_STENCIL_SIZE;
attribs[i++] = f.stencilBufferSize() == -1 ? 1 : f.stencilBufferSize();
}
if (f.alpha()) {
attribs[i++] = GLX_ALPHA_SIZE;
attribs[i++] = f.alphaBufferSize() == -1 ? 1 : f.alphaBufferSize();
}
if (f.accum()) {
attribs[i++] = GLX_ACCUM_RED_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
attribs[i++] = GLX_ACCUM_GREEN_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
attribs[i++] = GLX_ACCUM_BLUE_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
if (f.alpha()) {
attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
}
}
if (f.sampleBuffers()) {
attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
attribs[i++] = 1;
attribs[i++] = GLX_SAMPLES_ARB;
attribs[i++] = f.samples() == -1 ? 4 : f.samples();
}
attribs[i] = XNone;
}
bool QGLPixelBufferPrivate::init(const QSize &size, const QGLFormat &f, QGLWidget *shareWidget)
{
if (!qt_resolve_pbuffer_extensions()) {
qWarning("QGLPixelBuffer: pbuffers are not supported on this system.");
return false;
}
int attribs[40];
int num_configs = 0;
qt_format_to_attrib_list(f, attribs);
int screen = X11->defaultScreen;
if (shareWidget)
screen = shareWidget->x11Info().screen();
GLXFBConfig *configs = glXChooseFBConfig(X11->display, screen, attribs, &num_configs);
if (configs && num_configs) {
int res;
glXGetFBConfigAttrib(X11->display, configs[0], GLX_LEVEL, &res);
format.setPlane(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_DOUBLEBUFFER, &res);
format.setDoubleBuffer(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_DEPTH_SIZE, &res);
format.setDepth(res);
if (format.depth())
format.setDepthBufferSize(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_RGBA, &res);
format.setRgba(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_RED_SIZE, &res);
format.setRedBufferSize(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_GREEN_SIZE, &res);
format.setGreenBufferSize(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_BLUE_SIZE, &res);
format.setBlueBufferSize(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_ALPHA_SIZE, &res);
format.setAlpha(res);
if (format.alpha())
format.setAlphaBufferSize(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_ACCUM_RED_SIZE, &res);
format.setAccum(res);
if (format.accum())
format.setAccumBufferSize(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_STENCIL_SIZE, &res);
format.setStencil(res);
if (format.stencil())
format.setStencilBufferSize(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_STEREO, &res);
format.setStereo(res);
glXGetFBConfigAttrib(X11->display, configs[0], GLX_SAMPLE_BUFFERS_ARB, &res);
format.setSampleBuffers(res);
if (format.sampleBuffers()) {
glXGetFBConfigAttrib(X11->display, configs[0], GLX_SAMPLES_ARB, &res);
format.setSamples(res);
}
int pb_attribs[] = {GLX_PBUFFER_WIDTH, size.width(), GLX_PBUFFER_HEIGHT, size.height(), XNone};
GLXContext shareContext = 0;
if (shareWidget && shareWidget->d_func()->glcx)
shareContext = (GLXContext) shareWidget->d_func()->glcx->d_func()->cx;
pbuf = glXCreatePbuffer(QX11Info::display(), configs[0], pb_attribs);
ctx = glXCreateNewContext(QX11Info::display(), configs[0], GLX_RGBA_TYPE, shareContext, true);
XFree(configs);
if (!pbuf || !ctx) {
qWarning("QGLPixelBuffer: Unable to create a pbuffer/context - giving up.");
return false;
}
return true;
} else {
qWarning("QGLPixelBuffer: Unable to find a context/format match - giving up.");
return false;
}
}
bool QGLPixelBufferPrivate::cleanup()
{
glXDestroyPbuffer(QX11Info::display(), pbuf);
return true;
}
bool QGLPixelBuffer::bindToDynamicTexture(GLuint)
{
return false;
}
void QGLPixelBuffer::releaseFromDynamicTexture()
{
}
bool QGLPixelBuffer::hasOpenGLPbuffers()
{
bool ret = qt_resolve_pbuffer_extensions();
if (!ret)
return false;
int attribs[40];
int num_configs = 0;
qt_format_to_attrib_list(QGLFormat::defaultFormat(), attribs);
GLXFBConfig *configs = glXChooseFBConfig(X11->display, X11->defaultScreen, attribs, &num_configs);
GLXPbuffer pbuf = 0;
GLXContext ctx = 0;
if (configs && num_configs) {
int pb_attribs[] = {GLX_PBUFFER_WIDTH, 128, GLX_PBUFFER_HEIGHT, 128, XNone};
pbuf = glXCreatePbuffer(X11->display, configs[0], pb_attribs);
ctx = glXCreateNewContext(X11->display, configs[0], GLX_RGBA_TYPE, 0, true);
XFree(configs);
glXDestroyContext(X11->display, ctx);
glXDestroyPbuffer(X11->display, pbuf);
}
return pbuf && ctx;
}
QT_END_NAMESPACE
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