From: Simon C Mills (simon++at++wgs.estec.esa.nl)
Date: 09/12/2001 09:35:49
Hi all,
I want to place some text label attached to objects in the scene.
However, I'm having trouble setting the color of this text correctly. I
was basing my code in the standard example
/usr/share/Performer/src/pguide/libpf/C/text.c. I attach a modified
version to show the problem - the text in the scene always comes out
white no matter what, and the text over scene drawn after that comes out
blue, not red as I expected from the code. There would seem to be
nothing wrong. Can anyone shed any light on this?
Using Performer 2.2, IRIX 6.5.12m.
Regards, Simon
_______________________________________________________________________
Simon Mills
Modelling & Simulation Section (TOS-EMM) Tel: +31 (0)71 565 3725
European Space Agency (ESA/ESTEC) Fax: +31 (0)71 565 5420
Postbus 299, 2200AG Noordwijk e-mail: Simon.Mills++at++esa.int
The Netherlands http://www.estec.esa.nl/wmwww/EMM
_______________________________________________________________________
/*
* Copyright 1995, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
*
* UNPUBLISHED -- Rights reserved under the copyright laws of the United
* States. Use of a copyright notice is precautionary only and does not
* imply publication or disclosure.
*
* U.S. GOVERNMENT RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to restrictions
* as 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. Contractor/manufacturer is Silicon Graphics, Inc.,
* 2011 N. Shoreline Blvd. Mountain View, CA 94039-7311.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that (i) the above copyright notices and this
* permission notice appear in all copies of the software and related
* documentation, and (ii) the name of Silicon Graphics may not be
* used in any advertising or publicity relating to the software
* without the specific, prior written permission of Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR ANY SPECIAL,
* INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY
* DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY
* THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE
* OR PERFORMANCE OF THIS SOFTWARE.
*
* text.c: simple Performer program to demonstrate using
* GL text
*
* $Revision: 1.25 $
* $Date: 1995/12/08 23:23:09 $
*
*/
#include <stdlib.h>
#include <string.h>
#include <Performer/pf.h>
#include <Performer/pfdu.h>
static void DrawChannel(pfChannel *chan, void *data);
static pfMatrix idmat ={{1.0f, 0.0f, 0.0f, 0.0f},
{0.0f, 1.0f, 0.0f, 0.0f},
{0.0f, 0.0f, 1.0f, 0.0f},
{0.0f, 0.0f, 0.0f, 1.0f}};
pfSphere *bsphere;
#ifndef IRISGL /* OPENGL */
/*
* Would normally use pfuXFont routines, see pfuXFont man page
*/
static char fontName[] ="-*-courier-bold-r-normal--14-*-*-*-m-90-iso8859-1";
static int fontDLHandle;
static XFontStruct *fontInfo;
#define FIRSTGLYPH 32
#define LASTGLYPH 128
void loadXFont(void)
{
Display *xdisplay;
/* get font from X Server */
xdisplay = pfGetCurWSConnection();
fontInfo = XLoadQueryFont(xdisplay, fontName);
if(fontInfo == NULL){
pfNotify(PFNFY_FATAL, PFNFY_USAGE, "loadXFont: Couldn't load X font\n");
exit(1);
}
/* Create GL display lists for font */
pfNotify(PFNFY_NOTICE, PFNFY_PRINT, "loadXFont: making X font display "
"lists\n");
fontDLHandle = glGenLists((GLuint) LASTGLYPH + 1);
if(fontDLHandle == 0)
{
pfNotify(PFNFY_FATAL, PFNFY_USAGE, "loadXFont: Couldn't get %d "
"display lists\n", LASTGLYPH + 1);
exit(1);
}
glXUseXFont(fontInfo->fid, FIRSTGLYPH, LASTGLYPH - FIRSTGLYPH + 1,
fontDLHandle + FIRSTGLYPH);
}
void drawXFontString(char *s)
{
glPushAttrib(GL_LIST_BIT);
glListBase(fontDLHandle);
glCallLists(strlen(s), GL_UNSIGNED_BYTE, (GLubyte *)s);
glPopAttrib();
}
#endif /* OPENGL */
static void OpenPipeWin(pfPipeWindow *pw)
{
pfOpenPWin(pw);
#ifndef IRISGL
loadXFont();
#endif
}
static void
DrawChannel (pfChannel *channel, void *data)
{
static pfMatrix tempmat, tempmat2;
pfClearChan (channel);
pfDraw();
#ifdef IRISGL
zfunction (ZF_ALWAYS); /* text always drawn */
zwritemask (0x0);
#else /* OPENGL */
glDepthFunc(GL_ALWAYS); /* always draw */
glDepthMask(GL_FALSE);
#endif /* GL type */
/* text moving with the scene */
pfPushState();
pfBasicState();
#ifdef IRISGL
cmov (0.5f * bsphere->radius, 0.0f, 0.5f * bsphere->radius);
cpack(0xFFFFFF);
charstr ("Text-in-Scene");
#else /* OPENGL */
glRasterPos3f(0.5f * bsphere->radius, 0.0f, 0.5f * bsphere->radius);
glColor3ub(0, 0, 255);
drawXFontString("Text-in-Scene (blue)");
#endif /* GL type */
pfPopState();
/* text overlaid on top of scene, like a HUD */
pfPushState();
pfBasicState();
#ifdef IRISGL
mmode (MPROJECTION);
getmatrix (tempmat);
mmode (MVIEWING);
ortho2 (-10.0f, 10.0f, -10.0f, 10.0f);
#else /* OPENGL */
glGetFloatv(GL_PROJECTION_MATRIX, (GLfloat *)tempmat);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf((GLfloat *)idmat);
glOrtho(-10.0, 10.0, -10.0, 10.0, 1.0, -1.0);
glMatrixMode(GL_MODELVIEW);
#endif /* GL type */
pfPushMatrix();
pfLoadMatrix(idmat);
#ifdef IRISGL
cmov2 (-3.0f, 0.0f);
charstr ("text over scene");
#else /* OPENGL */
glRasterPos2f (-3.0f, 0.0f);
glColor3ub(255, 0, 0);
drawXFontString("text over scene (red)");
#endif /* GL type */
pfPopMatrix();
#ifdef IRISGL
mmode (MPROJECTION);
loadmatrix (tempmat);
mmode (MVIEWING);
#else /* OPENGL */
glMatrixMode(GL_PROJECTION);
glLoadMatrixf((GLfloat *)tempmat);
glMatrixMode(GL_MODELVIEW);
#endif /* GL type */
pfPopState();
#ifdef IRISGL
zfunction (ZF_LEQUAL); /* the default */
zwritemask (0xffffffff);
#else /* OPENGL */
glDepthFunc(GL_LEQUAL);
glDepthMask(GL_TRUE);
#endif /* GL type */
}
/*
* Usage() -- print usage advice and exit. This
* procedure is executed in the application process.
*/
static void
Usage (void)
{
pfNotify(PFNFY_FATAL, PFNFY_USAGE, "Usage: text file.ext ...\n");
exit(1);
}
int
main (int argc, char *argv[])
{
float t = 0.0f;
pfScene *scene;
pfPipe *p;
pfPipeWindow *pw;
pfChannel *chan;
pfNode *root;
if (argc < 2)
Usage();
/* Initialize Performer */
pfInit();
/* Use default multiprocessing mode based on number of
* processors.
*/
pfMultiprocess( PFMP_DEFAULT );
bsphere = (pfSphere*) pfMalloc (sizeof(pfSphere), pfGetSharedArena());
/* Load all loader DSO's before pfConfig() forks */
pfdInitConverter(argv[1]);
/* Configure multiprocessing mode and start parallel
* processes.
*/
pfConfig();
/* Append to PFPATH additional standard directories where
* geometry and textures exist
*/
pfFilePath(".:/usr/share/Performer/data");
/* Read a single file, of any known type. */
if ((root = pfdLoadFile(argv[1])) == NULL)
{
pfExit();
exit(-1);
}
/* Attach loaded file to a pfScene. */
scene = pfNewScene();
pfAddChild(scene, root);
/* determine extent of scene's geometry */
pfGetNodeBSphere (scene, bsphere);
/* Create a pfLightSource and attach it to scene. */
pfAddChild(scene, pfNewLSource());
/* Configure and open GL window */
p = pfGetPipe(0);
pw = pfNewPWin(p);
pfPWinType(pw, PFPWIN_TYPE_X);
pfPWinName(pw, argv[0]);
pfPWinOriginSize(pw, 0, 0, 500, 500);
/* Open and configure the GL window. */
pfPWinConfigFunc(pw, OpenPipeWin);
pfConfigPWin(pw);
/* Create and configure a pfChannel. */
chan = pfNewChan(p);
pfChanTravFunc(chan, PFTRAV_DRAW, DrawChannel);
pfChanScene(chan, scene);
pfChanNearFar(chan, 1.0f, 10.0f * bsphere->radius);
pfChanFOV(chan, 45.0f, 0.0f);
/* Simulate for twenty seconds. */
while (t < 20.0f)
{
float s, c;
pfCoord view;
/* Go to sleep until next frame time. */
pfSync();
/* Compute new view position. */
t = pfGetTime();
pfSinCos(45.0f*t, &s, &c);
pfSetVec3(view.hpr, 45.0f*t, -10.0f, 0);
pfSetVec3(view.xyz, 2.0f * bsphere->radius * s,
-2.0f * bsphere->radius *c,
0.5f * bsphere->radius);
pfChanView(chan, view.xyz, view.hpr);
/* Initiate cull/draw for this frame. */
pfFrame();
}
/* Terminate parallel processes and exit. */
pfExit();
return 0;
}
This archive was generated by hypermail 2b29 : Wed Sep 12 2001 - 08:32:36 PDT