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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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xswap.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* Unpublished-- rights reserved under the copyright laws of the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.
*/
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/glx.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/keysym.h>
static int RGBattributes_DB[] = {
GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DOUBLEBUFFER,
None,
};
static int CIattributes_DB[] = {
GLX_DOUBLEBUFFER,
None,
};
enum {
BLACK = 0,
RED,
GREEN,
YELLOW,
BLUE,
MAGENTA,
CYAN,
WHITE
};
#define COLOR_OFFSET_1 16
#define COLOR_OFFSET_2 32
static float rgbMap[][3] = {
{0, 0, 0},
{1, 0, 0},
{0, 1, 0},
{1, 1, 0},
{0, 0, 1},
{1, 0, 1},
{0, 1, 1},
{1, 1, 1}
};
static long W = 300, H = 300;
static Display *dpy;
static Window window;
static Colormap cmap;
int drawX = 1;
int drawGL = 1;
int doubleBuf = 1;
int swaps = 1;
GLenum drawBuffer = GL_FRONT;
static long rgb;
static long ci1 = BLUE, ci2 = GREEN;
static GLuint LoadGLFont(void)
{
XFontStruct *fontInfo;
Font id;
GLuint base;
int first, last;
static char pattern1[] = "-adobe-courier-bold-o-normal--18-*-*-*-*-*-*-*";
fontInfo = XLoadQueryFont(dpy, pattern1);
id = fontInfo->fid;
first = (int)fontInfo->min_char_or_byte2;
last = (int)fontInfo->max_char_or_byte2;
base = glGenLists(last+1);
if (base == 0) {
return 0;
}
glXUseXFont(id, first, last-first+1, (int)(base+first));
return base;
}
static void Usage(void)
{
printf("Usage: xswap [-c]\n");
printf(" -c: Run in color index mode\n");
exit(-1);
}
static GLint DrawXFont(GLint x, GLint y, char *string, GLint len)
{
static char pattern1[] = "-adobe-courier-bold-o-normal--18-*-*-*-*-*-*-*";
static char pattern2[] = "-*-*-*-*-*-*-18-*-*-*-*-*-*-*";
static char size[] = "456781";
GC gc;
XGCValues values;
XFontStruct *fontInfo;
char **fontList;
XColor exact, green;
unsigned long mask;
int count, i;
glXWaitGL();
fontList = XListFonts(dpy, pattern1, 1, &count);
if (count == 0) {
for (i = 0; i < 6; i++) {
pattern2[14] = size[i];
fontList = XListFonts(dpy, pattern2, 1, &count);
if (count > 0) {
break;
}
}
}
if (count == 0) {
return GL_FALSE;
}
fontInfo = XLoadQueryFont(dpy, fontList[0]);
if (fontInfo == NULL) {
return GL_FALSE;
}
mask = GCForeground | GCFont;
values.font = fontInfo->fid;
if (rgb) {
XAllocNamedColor(dpy, cmap, "Green", &exact, &green);
values.foreground = green.pixel;
} else {
values.foreground = 2;
}
gc = XCreateGC(dpy, window, mask, &values);
XDrawString(dpy, window, gc, (int)x, (int)y, string, (int)len);
XFreeFontNames(fontList);
glXWaitX();
return GL_TRUE;
}
static void DoDisplay(void)
{
glLoadIdentity();
glOrtho(0.0, W, 0.0, H, -0.5, 1000.0);
if (swaps) {
glDrawBuffer(GL_BACK);
glClearColor(0.0, 0.0, 1.0, 0.0);
glClearIndex(2);
glClear(GL_COLOR_BUFFER_BIT);
glDrawBuffer(GL_FRONT);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearIndex(0);
glClear(GL_COLOR_BUFFER_BIT);
} else {
glDrawBuffer(GL_BACK);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearIndex(0);
glClear(GL_COLOR_BUFFER_BIT);
glDrawBuffer(GL_FRONT);
glClearColor(0.0, 0.0, 1.0, 0.0);
glClearIndex(2);
glClear(GL_COLOR_BUFFER_BIT);
}
glDrawBuffer(drawBuffer);
if (drawGL) {
glRasterPos2f(10.0, 10.0);
glCallLists(17, GL_UNSIGNED_BYTE, (unsigned char *)"this is a GL font");
glXWaitGL();
}
if (drawX) {
DrawXFont(10,40, "this is an X font", 17);
glXWaitX();
}
if (drawBuffer == GL_FRONT)
printf("drawGL=%d, drawX=%d, drawbuffer=GL_FRONT\n",drawGL, drawX);
else
printf("drawGL=%d, drawX=%d, drawbuffer=GL_BACK\n",drawGL, drawX);
glFlush();
}
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(long argc, char** argv)
{
XVisualInfo *vi;
XSetWindowAttributes swa;
GLXContext cx;
XEvent event;
GLboolean needDisplay;
int i;
GLuint base;
rgb = 1;
doubleBuf = 1;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case 'c':
rgb = 0;
break;
default:
Usage();
}
} else {
Usage();
}
}
dpy = XOpenDisplay(0);
if (!dpy) {
fprintf(stderr, "Can't connect to display \"%s\"\n", getenv("DISPLAY"));
return -1;
}
vi = glXChooseVisual(dpy, DefaultScreen(dpy),
(rgb ? RGBattributes_DB : CIattributes_DB));
if (!vi) {
fprintf(stderr, "No appropriate visual on \"%s\"\n",
getenv("DISPLAY"));
return -1;
}
cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen), vi->visual,
rgb ? AllocNone : AllocAll);
if (!rgb) {
XColor buf;
int i;
buf.flags = DoRed | DoGreen | DoBlue;
/* Init color map */
for (i=0; i<16; i++) {
buf.pixel = i;
buf.blue = (i & 4) ? 65535 : 0;
buf.green = (i & 2) ? 65535 : 0;
buf.red = (i & 1) ? 65535 : 0;
if (i > 8) {
buf.red /= 2;
buf.green /= 2;
buf.blue /= 2;
}
XStoreColor(dpy, cmap, &buf);
}
}
swa.border_pixel = 0;
swa.colormap = cmap;
swa.event_mask = ExposureMask | StructureNotifyMask | KeyPressMask
| KeyReleaseMask;
window = XCreateWindow(dpy, RootWindow(dpy, vi->screen), 10, 10,
W, H,
0, vi->depth, InputOutput, vi->visual,
CWBorderPixel|CWColormap|CWEventMask, &swa);
XSetWMColormapWindows(dpy, window, &window, 1);
XMapWindow(dpy, window);
XIfEvent(dpy, &event, WaitForMapNotify, (char*)window);
cx = glXCreateContext(dpy, vi, 0, GL_TRUE);
if (!glXMakeCurrent(dpy, window, cx)) {
fprintf(stderr, "Can't make window current to context\n");
return -1;
}
/****
if (!rgb) {
XColor xc[32+2];
unsigned long pixel;
unsigned short red, green, blue;
char flags;
char pad;
for (i = 0; i < 16; i++) {
xc[i].pixel = i + COLOR_OFFSET_1;
xc[i].red = 0;
xc[i].green = 0;
xc[i].blue = (unsigned short) (65535.0 * (i / 15.0));
xc[i].flags = DoRed | DoGreen | DoBlue;
xc[i+16].pixel = i + COLOR_OFFSET_2;
xc[i+16].red = 0;
xc[i+16].green = (unsigned short) (65535.0 * (i / 15.0));
xc[i+16].blue = 0;
xc[i+16].flags = DoRed | DoGreen | DoBlue;
}
xc[32].pixel = BLUE;
xc[32].red = xc[32].green = 0;
xc[32].blue = 65535;
xc[32].flags = DoRed|DoGreen|DoBlue;
xc[32].pixel = GREEN;
xc[32].red = xc[32].blue = 0;
xc[32].green = 65535;
xc[32].flags = DoRed|DoGreen|DoBlue;
XStoreColors(dpy, cmap, xc, 34);
xswap
****/
base = LoadGLFont();
glListBase(base);
needDisplay = GL_TRUE;
for (;;) {
do {
XNextEvent(dpy, &event);
switch (event.type) {
case Expose:
needDisplay = GL_TRUE;
break;
case ConfigureNotify:
W = event.xconfigure.width;
H = event.xconfigure.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_f:
drawBuffer = GL_FRONT;
needDisplay = GL_TRUE;
break;
case XK_b:
drawBuffer = GL_BACK;
needDisplay = GL_TRUE;
break;
case XK_g:
drawGL = !drawGL;
needDisplay = GL_TRUE;
break;
case XK_x:
drawX = !drawX;
needDisplay = GL_TRUE;
break;
case XK_r:
needDisplay = GL_TRUE;
break;
case XK_S:
case XK_s:
glXSwapBuffers(dpy, window);
swaps = !swaps;
break;
case XK_Escape:
return 0;
}
}
break;
}
} while (XPending(dpy) != 0);
if (needDisplay) {
needDisplay = GL_FALSE;
DoDisplay();
}
}
}