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- /* glxdemo.c */
-
-
- /*
- * A demonstration of using the GLX functions. This program is in the
- * public domain.
- *
- * Brian Paul
- */
-
-
- #include <GL/gl.h>
- #include <GL/glx.h>
- #include <stdio.h>
- #include <stdlib.h>
-
-
-
- static void redraw( Display *dpy, Window w )
- {
- printf("Redraw event\n");
-
- glClear( GL_COLOR_BUFFER_BIT );
-
- glColor3f( 1.0, 1.0, 0.0 );
- glRectf( -0.8, -0.8, 0.8, 0.8 );
-
- glXSwapBuffers( dpy, w );
- }
-
-
-
- static void resize( unsigned int width, unsigned int height )
- {
- printf("Resize event\n");
- glViewport( 0, 0, width, height );
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
- }
-
-
-
- static Window make_rgb_db_window( Display *dpy,
- unsigned int width, unsigned int height )
- {
- int attrib[] = { GLX_RGBA,
- GLX_RED_SIZE, 1,
- GLX_GREEN_SIZE, 1,
- GLX_BLUE_SIZE, 1,
- GLX_DOUBLEBUFFER,
- None };
- int scrnum;
- XSetWindowAttributes attr;
- unsigned long mask;
- Window root;
- Window win;
- GLXContext ctx;
- XVisualInfo *visinfo;
-
- scrnum = DefaultScreen( dpy );
- root = RootWindow( dpy, scrnum );
-
- visinfo = glXChooseVisual( dpy, scrnum, attrib );
- if (!visinfo) {
- printf("Error: couldn't get an RGB, Double-buffered visual\n");
- exit(1);
- }
-
- /* window attributes */
- attr.background_pixel = 0;
- attr.border_pixel = 0;
- attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
- attr.event_mask = StructureNotifyMask | ExposureMask;
- mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
-
- win = XCreateWindow( dpy, root, 0, 0, width, height,
- 0, visinfo->depth, InputOutput,
- visinfo->visual, mask, &attr );
-
- ctx = glXCreateContext( dpy, visinfo, NULL, True );
-
- glXMakeCurrent( dpy, win, ctx );
-
- return win;
- }
-
-
- static void event_loop( Display *dpy )
- {
- XEvent event;
-
- while (1) {
- XNextEvent( dpy, &event );
-
- switch (event.type) {
- case Expose:
- redraw( dpy, event.xany.window );
- break;
- case ConfigureNotify:
- resize( event.xconfigure.width, event.xconfigure.height );
- break;
- }
- }
- }
-
-
-
- int main( int argc, char *argv[] )
- {
- Display *dpy;
- Window win;
-
- dpy = XOpenDisplay(NULL);
-
- win = make_rgb_db_window( dpy, 300, 300 );
-
- glShadeModel( GL_FLAT );
- glClearColor( 0.5, 0.5, 0.5, 1.0 );
-
- XMapWindow( dpy, win );
-
- event_loop( dpy );
- return 0;
- }
-