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progs/xdemos/glxpixmap.c
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160
progs/xdemos/glxpixmap.c
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/* $Id: glxpixmap.c,v 1.1 1999/08/19 00:55:43 jtg Exp $ */
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/*
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* A demonstration of using the GLXPixmap functions. This program is in
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* the public domain.
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*
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* Brian Paul
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*/
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/*
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* $Id: glxpixmap.c,v 1.1 1999/08/19 00:55:43 jtg Exp $
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*/
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <stdio.h>
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#include <stdlib.h>
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static GLXContext ctx;
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static XVisualInfo *visinfo;
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static GC gc;
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static Window make_rgb_window( Display *dpy,
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unsigned int width, unsigned int height )
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{
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int attrib[] = { GLX_RGBA,
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GLX_RED_SIZE, 1,
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GLX_GREEN_SIZE, 1,
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GLX_BLUE_SIZE, 1,
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None };
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int scrnum;
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XSetWindowAttributes attr;
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unsigned long mask;
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Window root;
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Window win;
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scrnum = DefaultScreen( dpy );
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root = RootWindow( dpy, scrnum );
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visinfo = glXChooseVisual( dpy, scrnum, attrib );
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if (!visinfo) {
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printf("Error: couldn't get an RGB, Double-buffered visual\n");
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exit(1);
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}
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/* window attributes */
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attr.background_pixel = 0;
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attr.border_pixel = 0;
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/* TODO: share root colormap if possible */
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attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
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attr.event_mask = StructureNotifyMask | ExposureMask;
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mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
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win = XCreateWindow( dpy, root, 0, 0, width, height,
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0, visinfo->depth, InputOutput,
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visinfo->visual, mask, &attr );
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/* make an X GC so we can do XCopyArea later */
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gc = XCreateGC( dpy, win, 0, NULL );
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ctx = glXCreateContext( dpy, visinfo, NULL, True );
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return win;
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}
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static GLXPixmap make_pixmap( Display *dpy, Window win,
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unsigned int width, unsigned int height )
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{
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Pixmap pm;
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GLXPixmap glxpm;
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XWindowAttributes attr;
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pm = XCreatePixmap( dpy, win, width, height, visinfo->depth );
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XGetWindowAttributes( dpy, win, &attr );
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/*
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* IMPORTANT:
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* Use the glXCreateGLXPixmapMESA funtion when using Mesa because
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* Mesa needs to know the colormap associated with a pixmap in order
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* to render correctly. This is because Mesa allows RGB rendering
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* into any kind of visual, not just TrueColor or DirectColor.
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*/
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#ifdef GLX_MESA_pixmap_colormap
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glxpm = glXCreateGLXPixmapMESA( dpy, visinfo, pm, attr.colormap );
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#else
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/* This will work with Mesa too if the visual is TrueColor or DirectColor */
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glxpm = glXCreateGLXPixmap( dpy, visinfo, pm );
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#endif
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return glxpm;
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}
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static void event_loop( Display *dpy, GLXPixmap pm )
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{
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XEvent event;
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while (1) {
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XNextEvent( dpy, &event );
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switch (event.type) {
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case Expose:
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printf("Redraw\n");
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/* copy the image from GLXPixmap to window */
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XCopyArea( dpy, pm, event.xany.window, /* src, dest */
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gc, 0, 0, 300, 300, /* gc, src pos, size */
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0, 0 ); /* dest pos */
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break;
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case ConfigureNotify:
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/* nothing */
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break;
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}
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}
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}
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int main( int argc, char *argv[] )
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{
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Display *dpy;
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Window win;
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GLXPixmap pm;
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dpy = XOpenDisplay(NULL);
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win = make_rgb_window( dpy, 300, 300 );
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pm = make_pixmap( dpy, win, 300, 300 );
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#ifdef JUNK
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glXMakeCurrent( dpy, win, ctx ); /*to make sure ctx is properly initialized*/
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#endif
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glXMakeCurrent( dpy, pm, ctx );
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/* Render an image into the pixmap */
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glShadeModel( GL_FLAT );
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glClearColor( 0.5, 0.5, 0.5, 1.0 );
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glClear( GL_COLOR_BUFFER_BIT );
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glViewport( 0, 0, 300, 300 );
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glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
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glColor3f( 0.0, 1.0, 1.0 );
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glRectf( -0.75, -0.75, 0.75, 0.75 );
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glFlush();
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/* when a redraw is needed we'll just copy the pixmap image to the window */
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XMapWindow( dpy, win );
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event_loop( dpy, pm );
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return 0;
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}
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