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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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toolbox
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src
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exampleCode
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opengl
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xlib
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pixmap.c
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1996-11-11
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/*
* (c) Copyright 1994, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
*
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
*
* U.S. GOVERNMENT RESTRICTED RIGHTS LEGEND
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
*/
/*
** $Revision: 1.2 $
** $Date: 1995/02/05 22:13:54 $
*/
/*
** This program is to demonstrate the use of OpenGL with both X windows
** and pixmaps. One context is shared between a pixmap and a window.
** Note that since the default is to render to the pixmap, no image will
** be drawn in the window when it first comes up.
**
** The picture consists of three triangles clipped and
** layered using depth and scissor tests.
**
** The user controls rendering with three keys:
** w Render to the window
** p Render to the pixmap (default)
** c Copy the contents of the pixmap into the window
**
** The program runs in rgb mode by default. To run in color index mode,
** use the command line option -c.
*/
#include <GL/glx.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/keysym.h>
static int RGBattributes[] = {
GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
None,
};
static int CIattributes[] = {
GLX_DEPTH_SIZE, 1,
None,
};
int width = 200, height = 200;
static void Reshape(int w, int h)
{
glViewport(0, 0, (GLint)w, (GLint)h);
width = w;
height = h;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);
glMatrixMode(GL_MODELVIEW);
}
static void Init(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearIndex(1.0);
glClearDepth(1);
glClearStencil(0);
glEnable(GL_DEPTH_TEST);
}
static void DoDisplay(void)
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3ub(200, 0, 0);
glIndexi(2);
glBegin(GL_POLYGON);
glVertex3i(-4, -3, -2);
glVertex3i( 4, -3, -2);
glVertex3i( 0, 4, -2);
glEnd();
glFlush();
glEnable(GL_SCISSOR_TEST);
glScissor(width/3, height/3, width/3, height/3);
glColor3ub(0, 200, 0);
glIndexi(29);
glBegin(GL_POLYGON);
glVertex3i(-4, -3, 0);
glVertex3i( 4, -3, 0);
glVertex3i( 0, 4, 0);
glEnd();
glDisable(GL_SCISSOR_TEST);
glFlush();
glColor3ub(0, 0, 200);
glIndexi(31);
glBegin(GL_POLYGON);
glVertex3i(-4, -4, -1);
glVertex3i( 4, -4, -1);
glVertex3i( 0, 3, -1);
glEnd();
glFlush();
}
static void Usage(void)
{
printf("Usage: pixmap [-c]\n");
printf(" -c: Run in color index mode\n");
exit(-1);
}
static Bool WaitForMapNotify(Display *d, XEvent *e, char *arg)
{
if ((e->type == MapNotify) && (e->xmap.window == (Window)arg)) {
return GL_TRUE;
}
return GL_FALSE;
}
int main(int argc, char *argv[])
{
/* X variables */
XVisualInfo *vi;
Display *dpy;
Colormap cmap;
Window window;
Window root;
Pixmap pixmap;
XSetWindowAttributes swa;
XEvent event;
GC gc;
/* GLX variables */
GLXContext cx;
GLXPixmap pm;
GLboolean needDisplay;
int gx, gy, i;
unsigned int gwidth, gheight, gborder_width, gdepth;
Status xggStatus;
int rgb = 1; /* Use rgb mode by default */
/*
** Read command line arguments.
*/
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case 'c':
rgb = 0;
break;
default:
Usage();
}
} else {
Usage();
}
}
/*
** Open the X connection.
*/
dpy = XOpenDisplay(0);
if (!dpy) {
fprintf(stderr, "Can't connect to display \"%s\"\n", getenv("DISPLAY"));
return -1;
}
/*
** Select the X visual enabled for OpenGL, using RGB or CI mode.
*/
vi = glXChooseVisual(dpy, DefaultScreen(dpy),
rgb ? RGBattributes : CIattributes);
if (!vi) {
fprintf(stderr, "No singlebuffered rgba visual on \"%s\"\n",
getenv("DISPLAY"));
return -1;
}
/*
** Create a colormap.
** If its RGB, then the visual is TrueColor and the map is already
** allocated read-only. For CI, allocate the entire map.
*/
cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen), vi->visual,
rgb ? AllocNone: AllocAll);
/* XXX
** could use some colormap setting here.
*/
/*
** Set the window attributes in the XSetWindowAttributes structure.
** Ask for events at exposure, change in window structure, key
** presses.
*/
swa.border_pixel = 0;
swa.colormap = cmap;
swa.event_mask = ExposureMask | StructureNotifyMask | KeyPressMask
| KeyReleaseMask;
window = XCreateWindow(dpy, RootWindow(dpy, vi->screen), 10, 10,
width, height,
0, vi->depth, InputOutput, vi->visual,
CWBorderPixel|CWColormap|CWEventMask, &swa);
XSetStandardProperties(dpy, window, "pixmap", "pixmap", None, argv, argc,
NULL);
XSetWMColormapWindows(dpy, window, &window, 1);
/*
** Make the window visible by mapping it.
*/
XMapWindow(dpy, window);
XIfEvent(dpy, &event, WaitForMapNotify, (char*)window);
/*
** Create an X graphics context.
*/
gc = XCreateGC(dpy, window, 0, NULL);
/*
** Create a pixmap, using the same depth as the window visual.
** Next, create a a GLX rendering area using that pixmap.
*/
pixmap = XCreatePixmap(dpy, RootWindow(dpy, vi->screen),
width, height, vi->depth);
pm = glXCreateGLXPixmap(dpy, vi, pixmap);
xggStatus = XGetGeometry(dpy, pixmap, &root, &gx, &gy, &gwidth, &gheight,
&gborder_width, &gdepth);
/*
** Create an OpenGL context, and make it current to the pixmap.
*/
cx = glXCreateContext(dpy, vi, 0, GL_FALSE);
if (!glXMakeCurrent(dpy, pm, cx)) {
fprintf(stderr, "Can't make pixmap current to context\n");
return -1;
}
printf("rendering to pixmap\n");
Init();
needDisplay = GL_TRUE;
/*
** Main event loop
*/
for (;;) {
do {
XNextEvent(dpy, &event);
switch (event.type) {
case Expose:
needDisplay = GL_TRUE;
break;
case ConfigureNotify:
width = event.xconfigure.width;
height = event.xconfigure.height;
Reshape(width, height);
needDisplay = GL_TRUE;
break;
case KeyPress:
{
char buf[100];
int rv;
KeySym ks;
rv = XLookupString(&event.xkey, buf, sizeof(buf), &ks, 0);
switch (ks) {
case XK_c:
/*
** Copy pixmap into window.
*/
xggStatus = XGetGeometry(dpy, window, &root, &gx, &gy,
&gwidth, &gheight, &gborder_width, &gdepth);
XCopyArea(dpy, pixmap, window, gc, 0, 0, gwidth,
gheight, gx, gy);
printf("copying the pixmap into the window\n");
break;
case XK_p:
/*
** Make the pixmap the current rendering target.
*/
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
if (!glXMakeCurrent(dpy, pm, cx)) {
fprintf(stderr,
"Can't make pixmap current to context\n");
return -1;
}
needDisplay = GL_TRUE;
printf("rendering to pixmap\n");
break;
case XK_w:
/*
** Make the window the current rendering target.
*/
if (!glXMakeCurrent(dpy, window, cx)) {
fprintf(stderr,
"Can't make window current to context\n");
return -1;
}
needDisplay = GL_TRUE;
printf("rendering to window\n");
break;
case XK_Escape:
return 0;
}
}
break;
}
} while (XPending(dpy) != 0);
if (needDisplay) {
needDisplay = GL_FALSE;
DoDisplay();
glFlush();
}
}
}