128 lines
2.4 KiB
C
128 lines
2.4 KiB
C
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/*
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* A demonstration of using the GLX functions. This program is in the
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* public domain.
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*
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* Brian Paul
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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 void redraw( Display *dpy, Window w )
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{
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printf("Redraw event\n");
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glClear( GL_COLOR_BUFFER_BIT );
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glColor3f( 1.0, 1.0, 0.0 );
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glRectf( -0.8, -0.8, 0.8, 0.8 );
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glXSwapBuffers( dpy, w );
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}
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static void resize( unsigned int width, unsigned int height )
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{
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printf("Resize event\n");
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
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}
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static Window make_rgb_db_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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GLX_DOUBLEBUFFER,
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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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GLXContext ctx;
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XVisualInfo *visinfo;
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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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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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ctx = glXCreateContext( dpy, visinfo, NULL, True );
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if (!ctx) {
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printf("Error: glXCreateContext failed\n");
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exit(1);
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}
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glXMakeCurrent( dpy, win, ctx );
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return win;
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}
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static void event_loop( Display *dpy )
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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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redraw( dpy, event.xany.window );
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break;
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case ConfigureNotify:
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resize( event.xconfigure.width, event.xconfigure.height );
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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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dpy = XOpenDisplay(NULL);
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win = make_rgb_db_window( dpy, 300, 300 );
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glShadeModel( GL_FLAT );
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glClearColor( 0.5, 0.5, 0.5, 1.0 );
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XMapWindow( dpy, win );
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event_loop( dpy );
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return 0;
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}
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