| |
| |
| /* |
| * 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 ); |
| if (!ctx) { |
| printf("Error: glXCreateContext failed\n"); |
| exit(1); |
| } |
| |
| 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; |
| } |