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Uses either the GLX_SGI_make_current_read or GLX 1.3 interface,

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depending on which is available.
This commit is contained in:
Ian Romanick 2004-05-07 18:20:43 +00:00
parent ed046bf842
commit 216d980d53
1 changed files with 23 additions and 5 deletions
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28
progs/xdemos/wincopy.c
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@ -55,7 +55,7 @@ static GLfloat Angle = 0.0;
static GLboolean DrawFront = GL_FALSE;
PFNGLXMAKECURRENTREADSGIPROC make_context_current = NULL;
static Window
CreateWindow(Display *dpy, int scrnum, XVisualInfo *visinfo,
@ -100,7 +100,7 @@ static void
Redraw(void)
{
/* make the first window the current one */
if (!glXMakeContextCurrent(Dpy, Win[0], Win[0], Context)) {
if (! (*make_context_current)(Dpy, Win[0], Win[0], Context)) {
printf("glXMakeContextCurrent failed in Redraw()\n");
return;
}
@ -145,7 +145,7 @@ Redraw(void)
/* copy image from window 0 to window 1 */
if (!glXMakeContextCurrent(Dpy, Win[1], Win[0], Context)) {
if (!(*make_context_current)(Dpy, Win[1], Win[0], Context)) {
printf("glXMakeContextCurrent failed in Redraw()\n");
return;
}
@ -259,8 +259,26 @@ Init(void)
ScrNum = DefaultScreen(Dpy);
glXQueryVersion(Dpy, &major, &minor);
if (major * 100 + minor < 103) {
fprintf(stderr, "Sorry, this program requires GLX 1.3\n");
if (major * 100 + minor >= 103) {
make_context_current = (PFNGLXMAKECURRENTREADSGIPROC)
glXGetProcAddressARB( (GLubyte *) "glXMakeContextCurrent" );
}
else {
const char * const glxExtensions = glXQueryExtensionsString(Dpy, ScrNum);
const char * ext = strstr( glxExtensions, "GLX_SGI_make_current_read" );
const size_t len = strlen( "GLX_SGI_make_current_read" );
if ( (ext != NULL)
&& ((ext[len] == ' ') || (ext[len] == '\0')) ) {
make_context_current = (PFNGLXMAKECURRENTREADSGIPROC)
glXGetProcAddressARB( (GLubyte *) "glXMakeCurrentReadSGI" );
}
}
if (make_context_current == NULL) {
fprintf(stderr, "Sorry, this program requires either GLX 1.3 "
"or GLX_SGI_make_current_read.\n");
exit(1);
}