xenocara/dist/Mesa/progs/xdemos/xdemo.c
2006-11-25 18:56:37 +00:00

335 lines
7.7 KiB
C

/*
* Very simple demo of how to use the Mesa/X11 interface instead of the
* glx, tk or aux toolkits. I highly recommend using the GLX interface
* instead of the X/Mesa interface, however.
*
* This program is in the public domain.
*
* Brian Paul
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "GL/xmesa.h"
#include "GL/gl.h"
static GLint Black, Red, Green, Blue;
static void make_window( char *title, int color_flag )
{
int x = 10, y = 10, width = 400, height = 300;
Display *dpy;
int scr;
Window root, win;
Colormap cmap;
XColor xcolor;
int attr_flags;
XVisualInfo *visinfo;
XSetWindowAttributes attr;
XTextProperty tp;
XSizeHints sh;
XEvent e;
XMesaContext context;
XMesaVisual visual;
XMesaBuffer buffer;
/*
* Do the usual X things to make a window.
*/
dpy = XOpenDisplay(NULL);
if (!dpy) {
printf("Couldn't open default display!\n");
exit(1);
}
scr = DefaultScreen(dpy);
root = RootWindow(dpy, scr);
/* alloc visinfo struct */
visinfo = (XVisualInfo *) malloc( sizeof(XVisualInfo) );
/* Get a visual and colormap */
if (color_flag) {
/* Open TrueColor window */
/*
if (!XMatchVisualInfo( dpy, scr, 24, TrueColor, visinfo )) {
printf("Couldn't get 24-bit TrueColor visual!\n");
exit(1);
}
*/
if (!XMatchVisualInfo( dpy, scr, 8, PseudoColor, visinfo )) {
printf("Couldn't get 8-bit PseudoColor visual!\n");
exit(1);
}
cmap = XCreateColormap( dpy, root, visinfo->visual, AllocNone );
Black = Red = Green = Blue = 0;
}
else {
/* Open color index window */
if (!XMatchVisualInfo( dpy, scr, 8, PseudoColor, visinfo )) {
printf("Couldn't get 8-bit PseudoColor visual\n");
exit(1);
}
cmap = XCreateColormap( dpy, root, visinfo->visual, AllocNone );
/* Allocate colors */
xcolor.red = 0x0;
xcolor.green = 0x0;
xcolor.blue = 0x0;
xcolor.flags = DoRed | DoGreen | DoBlue;
if (!XAllocColor( dpy, cmap, &xcolor )) {
printf("Couldn't allocate black!\n");
exit(1);
}
Black = xcolor.pixel;
xcolor.red = 0xffff;
xcolor.green = 0x0;
xcolor.blue = 0x0;
xcolor.flags = DoRed | DoGreen | DoBlue;
if (!XAllocColor( dpy, cmap, &xcolor )) {
printf("Couldn't allocate red!\n");
exit(1);
}
Red = xcolor.pixel;
xcolor.red = 0x0;
xcolor.green = 0xffff;
xcolor.blue = 0x0;
xcolor.flags = DoRed | DoGreen | DoBlue;
if (!XAllocColor( dpy, cmap, &xcolor )) {
printf("Couldn't allocate green!\n");
exit(1);
}
Green = xcolor.pixel;
xcolor.red = 0x0;
xcolor.green = 0x0;
xcolor.blue = 0xffff;
xcolor.flags = DoRed | DoGreen | DoBlue;
if (!XAllocColor( dpy, cmap, &xcolor )) {
printf("Couldn't allocate blue!\n");
exit(1);
}
Blue = xcolor.pixel;
}
/* set window attributes */
attr.colormap = cmap;
attr.event_mask = ExposureMask | StructureNotifyMask;
attr.border_pixel = BlackPixel( dpy, scr );
attr.background_pixel = BlackPixel( dpy, scr );
attr_flags = CWColormap | CWEventMask | CWBorderPixel | CWBackPixel;
/* Create the window */
win = XCreateWindow( dpy, root, x,y, width, height, 0,
visinfo->depth, InputOutput,
visinfo->visual,
attr_flags, &attr);
if (!win) {
printf("Couldn't open window!\n");
exit(1);
}
XStringListToTextProperty(&title, 1, &tp);
sh.flags = USPosition | USSize;
XSetWMProperties(dpy, win, &tp, &tp, 0, 0, &sh, 0, 0);
XMapWindow(dpy, win);
while (1) {
XNextEvent( dpy, &e );
if (e.type == MapNotify && e.xmap.window == win) {
break;
}
}
/*
* Now do the special Mesa/Xlib stuff!
*/
visual = XMesaCreateVisual( dpy, visinfo,
(GLboolean) color_flag,
GL_FALSE, /* alpha_flag */
GL_FALSE, /* db_flag */
GL_FALSE, /* stereo flag */
GL_FALSE, /* ximage_flag */
0, /* depth size */
0, /* stencil size */
0,0,0,0, /* accum_size */
0, /* num samples */
0, /* level */
0 /* caveat */
);
if (!visual) {
printf("Couldn't create Mesa/X visual!\n");
exit(1);
}
/* Create a Mesa rendering context */
context = XMesaCreateContext( visual,
NULL /* share_list */
);
if (!context) {
printf("Couldn't create Mesa/X context!\n");
exit(1);
}
buffer = XMesaCreateWindowBuffer( visual, win );
if (!buffer) {
printf("Couldn't create Mesa/X buffer!\n");
exit(1);
}
XMesaMakeCurrent( context, buffer );
/* Ready to render! */
}
static void draw_cube( void )
{
/* X faces */
glIndexi( Red );
glColor3f( 1.0, 0.0, 0.0 );
glBegin( GL_POLYGON );
glVertex3f( 1.0, 1.0, 1.0 );
glVertex3f( 1.0, -1.0, 1.0 );
glVertex3f( 1.0, -1.0, -1.0 );
glVertex3f( 1.0, 1.0, -1.0 );
glEnd();
glBegin( GL_POLYGON );
glVertex3f( -1.0, 1.0, 1.0 );
glVertex3f( -1.0, 1.0, -1.0 );
glVertex3f( -1.0, -1.0, -1.0 );
glVertex3f( -1.0, -1.0, 1.0 );
glEnd();
/* Y faces */
glIndexi( Green );
glColor3f( 0.0, 1.0, 0.0 );
glBegin( GL_POLYGON );
glVertex3f( 1.0, 1.0, 1.0 );
glVertex3f( 1.0, 1.0, -1.0 );
glVertex3f( -1.0, 1.0, -1.0 );
glVertex3f( -1.0, 1.0, 1.0 );
glEnd();
glBegin( GL_POLYGON );
glVertex3f( 1.0, -1.0, 1.0 );
glVertex3f( -1.0, -1.0, 1.0 );
glVertex3f( -1.0, -1.0, -1.0 );
glVertex3f( 1.0, -1.0, -1.0 );
glEnd();
/* Z faces */
glIndexi( Blue );
glColor3f( 0.0, 0.0, 1.0 );
glBegin( GL_POLYGON );
glVertex3f( 1.0, 1.0, 1.0 );
glVertex3f( -1.0, 1.0, 1.0 );
glVertex3f( -1.0, -1.0, 1.0 );
glVertex3f( 1.0, -1.0, 1.0 );
glEnd();
glBegin( GL_POLYGON );
glVertex3f( 1.0, 1.0, -1.0 );
glVertex3f( 1.0,-1.0, -1.0 );
glVertex3f( -1.0,-1.0, -1.0 );
glVertex3f( -1.0, 1.0, -1.0 );
glEnd();
}
static void display_loop( void )
{
GLfloat xrot, yrot, zrot;
xrot = yrot = zrot = 0.0;
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glClearIndex( Black );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 1.0, 10.0 );
glTranslatef( 0.0, 0.0, -5.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glCullFace( GL_BACK );
glEnable( GL_CULL_FACE );
glShadeModel( GL_FLAT );
while (1) {
glClear( GL_COLOR_BUFFER_BIT );
glPushMatrix();
glRotatef( xrot, 1.0, 0.0, 0.0 );
glRotatef( yrot, 0.0, 1.0, 0.0 );
glRotatef( zrot, 0.0, 0.0, 1.0 );
draw_cube();
glPopMatrix();
glFinish();
xrot += 10.0;
yrot += 7.0;
zrot -= 3.0;
}
}
int main( int argc, char *argv[] )
{
int mode = 0;
if (argc >= 2)
{
if (strcmp(argv[1],"-ci")==0)
mode = 0;
else if (strcmp(argv[1],"-rgb")==0)
mode = 1;
else
{
printf("Bad flag: %s\n", argv[1]);
printf("Specify -ci for 8-bit color index or -rgb for RGB mode\n");
exit(1);
}
}
else
{
printf("Specify -ci for 8-bit color index or -rgb for RGB mode\n");
printf("Defaulting to 8-bit color index\n");
}
make_window( argv[0], mode );
display_loop();
return 0;
}