Initial revision
This commit is contained in:
jtg
305
progs/xdemos/shape.c
Normal file
305
progs/xdemos/shape.c
Normal file
@@ -0,0 +1,305 @@
|
||||
/* $Id: shape.c,v 1.1 1999/08/19 00:55:43 jtg Exp $ */
|
||||
|
||||
/*
|
||||
* Example of using the X "shape" extension with OpenGL: render a spinning
|
||||
* cube inside of a non-rectangular window.
|
||||
*
|
||||
* Press ESC to exit. Press up/down to change window shape.
|
||||
*
|
||||
* To compile add "shape" to the PROGS list in Makefile.
|
||||
*
|
||||
* Brian Paul
|
||||
* June 16, 1997
|
||||
*
|
||||
* This program is in the public domain.
|
||||
*/
|
||||
|
||||
|
||||
#include <math.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <X11/Xlib.h>
|
||||
#include <X11/Xutil.h>
|
||||
#include <X11/keysym.h>
|
||||
#include <X11/extensions/shape.h>
|
||||
#include <GL/glx.h>
|
||||
|
||||
#ifndef PI
|
||||
#define PI 3.1415926
|
||||
#endif
|
||||
|
||||
|
||||
static int Width=500, Height=500;
|
||||
|
||||
static float Xangle = 0.0, Yangle = 0.0;
|
||||
static int Redraw = 0;
|
||||
static int Sides = 5;
|
||||
static int MinSides = 3;
|
||||
static int MaxSides = 20;
|
||||
|
||||
|
||||
/*
|
||||
* Draw the OpenGL stuff and do a SwapBuffers.
|
||||
*/
|
||||
static void display(Display *dpy, Window win)
|
||||
{
|
||||
float scale = 1.7;
|
||||
|
||||
glClear(GL_COLOR_BUFFER_BIT);
|
||||
|
||||
glPushMatrix();
|
||||
|
||||
glScalef(scale, scale, scale);
|
||||
glRotatef(Xangle, 1.0, 0.0, 0.0);
|
||||
glRotatef(Yangle, 0.0, 1.0, 0.0);
|
||||
|
||||
glColor3f(1.0, 1.0, 1.0);
|
||||
glBegin(GL_LINE_LOOP);
|
||||
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_LINE_LOOP);
|
||||
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_LINES);
|
||||
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);
|
||||
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();
|
||||
|
||||
glPopMatrix();
|
||||
|
||||
glXSwapBuffers(dpy, win);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Called when no events are pending.
|
||||
*/
|
||||
static void idle(void)
|
||||
{
|
||||
Xangle += 2.0;
|
||||
Yangle += 3.3;
|
||||
Redraw = 1;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* This is called when we have to recompute the window shape bitmask.
|
||||
* We just generate an n-sided regular polygon here but any other shape
|
||||
* would be possible.
|
||||
*/
|
||||
static void make_shape_mask(Display *dpy, Window win, int width, int height,
|
||||
int sides)
|
||||
{
|
||||
Pixmap shapeMask;
|
||||
XGCValues xgcv;
|
||||
GC gc;
|
||||
|
||||
/* allocate 1-bit deep pixmap and a GC */
|
||||
shapeMask = XCreatePixmap(dpy, win, width, height, 1);
|
||||
gc = XCreateGC(dpy, shapeMask, 0, &xgcv);
|
||||
|
||||
/* clear shapeMask to zeros */
|
||||
XSetForeground(dpy, gc, 0);
|
||||
XFillRectangle(dpy, shapeMask, gc, 0, 0, width, height);
|
||||
|
||||
/* draw mask */
|
||||
XSetForeground(dpy, gc, 1);
|
||||
{
|
||||
int cx = width / 2;
|
||||
int cy = height / 2;
|
||||
float angle = 0.0;
|
||||
float step = 2.0 * PI / sides;
|
||||
float radius = width / 2;
|
||||
int i;
|
||||
XPoint points[100];
|
||||
for (i=0;i<sides;i++) {
|
||||
int x = cx + radius * sin(angle);
|
||||
int y = cy - radius * cos(angle);
|
||||
points[i].x = x;
|
||||
points[i].y = y;
|
||||
angle += step;
|
||||
}
|
||||
XFillPolygon(dpy, shapeMask, gc, points, sides, Convex, CoordModeOrigin);
|
||||
}
|
||||
|
||||
/* This is the only SHAPE extension call- simple! */
|
||||
XShapeCombineMask(dpy, win, ShapeBounding, 0, 0, shapeMask, ShapeSet);
|
||||
|
||||
XFreeGC(dpy, gc);
|
||||
XFreePixmap(dpy, shapeMask);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Called when window is resized. Do OpenGL viewport and projection stuff.
|
||||
*/
|
||||
static void reshape(int width, int height)
|
||||
{
|
||||
glViewport(0, 0, width, height);
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glLoadIdentity();
|
||||
glFrustum(-1.0, 1.0, -1.0, 1.0, 3.0, 20.0);
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
glLoadIdentity();
|
||||
glTranslatef(0.0, 0.0, -10.0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Process X events.
|
||||
*/
|
||||
static void event_loop(Display *dpy, Window win)
|
||||
{
|
||||
while (1) {
|
||||
XEvent event;
|
||||
if (XPending(dpy)) {
|
||||
XNextEvent(dpy, &event);
|
||||
switch (event.type) {
|
||||
case Expose:
|
||||
display(dpy, event.xexpose.window);
|
||||
break;
|
||||
case ConfigureNotify:
|
||||
Width = event.xconfigure.width;
|
||||
Height = event.xconfigure.height,
|
||||
make_shape_mask(dpy, win, Width, Height, Sides);
|
||||
reshape(Width, Height);
|
||||
break;
|
||||
case KeyPress:
|
||||
{
|
||||
char buf[100];
|
||||
KeySym keySym;
|
||||
XComposeStatus stat;
|
||||
XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
|
||||
switch (keySym) {
|
||||
case XK_Escape:
|
||||
exit(0);
|
||||
break;
|
||||
case XK_Up:
|
||||
Sides++;
|
||||
if (Sides>MaxSides) Sides = MaxSides;
|
||||
make_shape_mask(dpy, win, Width, Height, Sides);
|
||||
break;
|
||||
case XK_Down:
|
||||
Sides--;
|
||||
if (Sides<MinSides) Sides = MinSides;
|
||||
make_shape_mask(dpy, win, Width, Height, Sides);
|
||||
break;
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
;;
|
||||
}
|
||||
}
|
||||
else {
|
||||
idle();
|
||||
if (Redraw) {
|
||||
display(dpy, win);
|
||||
Redraw = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Allocate a "nice" colormap. This could be better (HP-CR support, etc).
|
||||
*/
|
||||
static Colormap alloc_colormap(Display *dpy, Window parent, Visual *vis)
|
||||
{
|
||||
Screen *scr = DefaultScreenOfDisplay(dpy);
|
||||
int scrnum = DefaultScreen(dpy);
|
||||
|
||||
if (MaxCmapsOfScreen(scr)==1 && vis==DefaultVisual(dpy, scrnum)) {
|
||||
/* The window and root are of the same visual type so */
|
||||
/* share the root colormap. */
|
||||
return DefaultColormap(dpy, scrnum);
|
||||
}
|
||||
else {
|
||||
return XCreateColormap(dpy, parent, vis, AllocNone);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
static int glAttribs[] = {
|
||||
GLX_DOUBLEBUFFER,
|
||||
GLX_RGBA,
|
||||
GLX_DEPTH_SIZE, 1,
|
||||
None
|
||||
};
|
||||
Display *dpy;
|
||||
XVisualInfo *visInfo;
|
||||
int scrn;
|
||||
Window root;
|
||||
Colormap cmap;
|
||||
Window win;
|
||||
XSetWindowAttributes winAttribs;
|
||||
unsigned long winAttribsMask;
|
||||
GLXContext glCtx;
|
||||
int ignore;
|
||||
|
||||
dpy = XOpenDisplay(NULL);
|
||||
if (!dpy) {
|
||||
fprintf(stderr, "Couldn't open default display\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* check that we can use the shape extension */
|
||||
if (!XQueryExtension(dpy, "SHAPE", &ignore, &ignore, &ignore )) {
|
||||
fprintf(stderr, "Display doesn't support shape extension\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
scrn = DefaultScreen(dpy);
|
||||
|
||||
root = RootWindow(dpy, scrn);
|
||||
|
||||
visInfo = glXChooseVisual(dpy, scrn, glAttribs);
|
||||
if (!visInfo) {
|
||||
fprintf(stderr, "Couldn't get RGB, DB, Z visual\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
glCtx = glXCreateContext(dpy, visInfo, 0, True);
|
||||
if (!glCtx) {
|
||||
fprintf(stderr, "Couldn't create GL context\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
cmap = alloc_colormap(dpy, root, visInfo->visual);
|
||||
if (!cmap) {
|
||||
fprintf(stderr, "Couln't create colormap\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
winAttribs.border_pixel = 0;
|
||||
winAttribs.colormap = cmap;
|
||||
winAttribs.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
|
||||
winAttribsMask = CWBorderPixel | CWColormap | CWEventMask;
|
||||
win = XCreateWindow(dpy, root, 0, 0, Width, Height, 0,
|
||||
visInfo->depth, InputOutput,
|
||||
visInfo->visual,
|
||||
winAttribsMask, &winAttribs);
|
||||
XMapWindow(dpy, win);
|
||||
|
||||
glXMakeCurrent(dpy, win, glCtx);
|
||||
|
||||
printf("Press ESC to exit.\n");
|
||||
printf("Press up/down to change window shape.\n");
|
||||
|
||||
event_loop(dpy, win);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user