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/*
* OpenGL pbuffers utility functions.
*
* Brian Paul
* April 1997
* Updated on 5 October 2002
*/
#include <stdio.h>
#include <string.h>
#include "pbutil.h"
/*
* Test if we pixel buffers are available for a particular X screen.
* Input: dpy - the X display
* screen - screen number
* Return: 0 = pixel buffers not available.
* 1 = pixel buffers are available.
*/
int
QueryPbuffers(Display *dpy, int screen)
{
#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
char *extensions;
extensions = (char *) glXQueryServerString(dpy, screen, GLX_EXTENSIONS);
if (!strstr(extensions,"GLX_SGIX_fbconfig")) {
return 0;
}
if (!strstr(extensions,"GLX_SGIX_pbuffer")) {
return 0;
}
return 1;
#else
return 0;
#endif
}
#ifdef GLX_SGIX_fbconfig
/*
* Print parameters for a GLXFBConfig to stdout.
* Input: dpy - the X display
* fbConfig - the fbconfig handle
* horizFormat - if true, print in horizontal format
*/
void
PrintFBConfigInfo(Display *dpy, GLXFBConfigSGIX fbConfig, Bool horizFormat)
{
int pbAttribs[] = {GLX_LARGEST_PBUFFER_SGIX, True,
GLX_PRESERVED_CONTENTS_SGIX, False,
None};
GLXPbufferSGIX pBuffer;
int width=2, height=2;
int bufferSize, level, doubleBuffer, stereo, auxBuffers;
int redSize, greenSize, blueSize, alphaSize;
int depthSize, stencilSize;
int accumRedSize, accumBlueSize, accumGreenSize, accumAlphaSize;
int sampleBuffers, samples;
int drawableType, renderType, xRenderable, xVisual, id;
int maxWidth, maxHeight, maxPixels;
int optWidth, optHeight;
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_BUFFER_SIZE, &bufferSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_LEVEL, &level);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_DOUBLEBUFFER, &doubleBuffer);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_STEREO, &stereo);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_AUX_BUFFERS, &auxBuffers);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_RED_SIZE, &redSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_GREEN_SIZE, &greenSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_BLUE_SIZE, &blueSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ALPHA_SIZE, &alphaSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_DEPTH_SIZE, &depthSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_STENCIL_SIZE, &stencilSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_RED_SIZE, &accumRedSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_GREEN_SIZE, &accumGreenSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_BLUE_SIZE, &accumBlueSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_ALPHA_SIZE, &accumAlphaSize);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_SAMPLE_BUFFERS_SGIS, &sampleBuffers);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_SAMPLES_SGIS, &samples);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_DRAWABLE_TYPE_SGIX, &drawableType);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_RENDER_TYPE_SGIX, &renderType);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_X_RENDERABLE_SGIX, &xRenderable);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_X_VISUAL_TYPE_EXT, &xVisual);
if (!xRenderable || !(drawableType & GLX_WINDOW_BIT_SGIX))
xVisual = -1;
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_FBCONFIG_ID_SGIX, &id);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_MAX_PBUFFER_WIDTH_SGIX,
&maxWidth);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_MAX_PBUFFER_HEIGHT_SGIX,
&maxHeight);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_MAX_PBUFFER_PIXELS_SGIX,
&maxPixels);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_OPTIMAL_PBUFFER_WIDTH_SGIX,
&optWidth);
glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX,
&optHeight);
pBuffer = CreatePbuffer(dpy, fbConfig, width, height, pbAttribs);
if (horizFormat) {
printf("0x%03x ", id);
if (xVisual==GLX_STATIC_GRAY) printf("StaticGray ");
else if (xVisual==GLX_GRAY_SCALE) printf("GrayScale ");
else if (xVisual==GLX_STATIC_COLOR) printf("StaticColor ");
else if (xVisual==GLX_PSEUDO_COLOR) printf("PseudoColor ");
else if (xVisual==GLX_TRUE_COLOR) printf("TrueColor ");
else if (xVisual==GLX_DIRECT_COLOR) printf("DirectColor ");
else printf(" -none- ");
printf(" %3d %3d %s %s %s %2s ", bufferSize, level,
(renderType & GLX_RGBA_BIT_SGIX) ? "y" : "n",
(renderType & GLX_COLOR_INDEX_BIT_SGIX) ? "y" : "n",
doubleBuffer ? "y" : "n",
stereo ? "y" : "n");
printf("%2d %2d %2d %2d ", redSize, greenSize, blueSize, alphaSize);
printf("%2d %2d ", depthSize, stencilSize);
printf("%2d %2d %2d %2d", accumRedSize, accumGreenSize, accumBlueSize,
accumAlphaSize);
printf(" %2d %2d", sampleBuffers, samples);
printf(" %s", pBuffer ? "y" : "n");
printf("\n");
}
else {
printf("Id 0x%x\n", id);
printf(" Buffer Size: %d\n", bufferSize);
printf(" Level: %d\n", level);
printf(" Double Buffer: %s\n", doubleBuffer ? "yes" : "no");
printf(" Stereo: %s\n", stereo ? "yes" : "no");
printf(" Aux Buffers: %d\n", auxBuffers);
printf(" Red Size: %d\n", redSize);
printf(" Green Size: %d\n", greenSize);
printf(" Blue Size: %d\n", blueSize);
printf(" Alpha Size: %d\n", alphaSize);
printf(" Depth Size: %d\n", depthSize);
printf(" Stencil Size: %d\n", stencilSize);
printf(" Accum Red Size: %d\n", accumRedSize);
printf(" Accum Green Size: %d\n", accumGreenSize);
printf(" Accum Blue Size: %d\n", accumBlueSize);
printf(" Accum Alpha Size: %d\n", accumAlphaSize);
printf(" Sample Buffers: %d\n", sampleBuffers);
printf(" Samples/Pixel: %d\n", samples);
printf(" Drawable Types: ");
if (drawableType & GLX_WINDOW_BIT_SGIX) printf("Window ");
if (drawableType & GLX_PIXMAP_BIT_SGIX) printf("Pixmap ");
if (drawableType & GLX_PBUFFER_BIT_SGIX) printf("PBuffer");
printf("\n");
printf(" Render Types: ");
if (renderType & GLX_RGBA_BIT_SGIX) printf("RGBA ");
if (renderType & GLX_COLOR_INDEX_BIT_SGIX) printf("CI ");
printf("\n");
printf(" X Renderable: %s\n", xRenderable ? "yes" : "no");
/*
printf(" Max width: %d\n", maxWidth);
printf(" Max height: %d\n", maxHeight);
printf(" Max pixels: %d\n", maxPixels);
printf(" Optimum width: %d\n", optWidth);
printf(" Optimum height: %d\n", optHeight);
*/
printf(" Pbuffer: %s\n", pBuffer ? "yes" : "no");
}
if (pBuffer) {
glXDestroyGLXPbufferSGIX(dpy, pBuffer);
}
}
/* This is only used by CreatePbuffer() */
static int XErrorFlag = 0;
static int HandleXError( Display *dpy, XErrorEvent *event )
{
XErrorFlag = 1;
return 0;
}
/*
* Create a pixel buffer. We loop over the list of fbconfigs trying to create
* a pixel buffer. We return the first pixel buffer which we successfully
* create. This function hides the ugliness of dealing with BadAlloc X
* protocol errors.
*
* Input: dpy - the X display
* fbConfig - an FBConfig as returned by glXChooseFBConfigSGIX().
* width, height - size of pixel buffer to request, in pixels.
* pbAttribs - list of pixel buffer attributes as used by
* glXCreateGLXPbufferSGIX().
* Return: a pixel buffer or None.
*/
GLXPbufferSGIX
CreatePbuffer( Display *dpy, GLXFBConfigSGIX fbConfig,
int width, int height, int *pbAttribs )
{
int (*oldHandler)( Display *, XErrorEvent * );
GLXPbufferSGIX pBuffer = None;
/* Catch X protocol errors with our own error handler */
oldHandler = XSetErrorHandler( HandleXError );
XErrorFlag = 0;
pBuffer = glXCreateGLXPbufferSGIX(dpy, fbConfig, width, height, pbAttribs);
/* Restore original X error handler */
(void) XSetErrorHandler( oldHandler );
/* Return pbuffer (may be None) */
if (!XErrorFlag && pBuffer!=None) {
/*printf("config %d worked!\n", i);*/
return pBuffer;
}
else {
return None;
}
}
#endif /*GLX_SGIX_fbconfig*/
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