From: Benedikt Kessler (bjk++at++sgi.com)
Date: 07/26/2005 03:18:32
Hi!
thy this modified drawFunc (assuming you wanted your texture to cover the whole window background (I removed the stencil calls as stencil was never used elsewhere):
void drawFunc(pfChannel *chan, void *data)
{
GLubyte imagebuffer[500][500][4];
static int justOnce = 0;
if (justOnce == 0) {
int i,j;
int c;
for (i = 0; i < winWidth; i++) {
for (j = 0; j < winHeight; j++) {
c = ((((i&0x8)==0)^((j&0x8))==0))*255;
imagebuffer[i][j][0] = (GLubyte) c;
imagebuffer[i][j][1] = (GLubyte) c;
imagebuffer[i][j][2] = (GLubyte) c;
imagebuffer[i][j][3] = (GLubyte) 255;
}
}
justOnce = 1;
}
// pfClearChan(chan);
pfPushState();
pfBasicState();
// thus we can skip the pfClearChan above and get both
// buffers (color and depth) initialized by our background
glDepthFunc(GL_ALWAYS);
glDepthRange(1.0,1.0);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0,winWidth,0,winWidth, -1.0, 1.0);
glRasterPos2i(0, 0);
glDrawPixels(winWidth, winHeight, GL_RGBA, GL_UNSIGNED_BYTE, imagebuffer);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glDepthRange(0.0,1.0);
glDepthFunc(GL_LEQUAL);
pfPopState();
pfDraw();
}
Bye! Benedikt
Rajesh R wrote:
>
> Dear Performers,
>
> My destiny with background skybox rendering is very poor. So far I have
> not able to
> render even a background texture. The code given below works. But the
> texture is rendering as a front portion instead of a background texture.
>
> Any suggestions pLease,
>
> #include <stdlib.h>
> #include <Performer/pf.h>
> #include <Performer/pfutil.h>
> #include <Performer/pfdu.h>
> #include <Performer/prmath.h>
> #include <gl.h>
> #include <glut.h>
>
> typedef struct
> {
> long val;
> } PassData;
>
> 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}};
>
> void DrawChannel(pfChannel* chan,void *data);
> int winWidth = 500;
> int winHeight = 500;
>
> void cullFunc(pfChannel *chan, void *data);
> void drawFunc(pfChannel *chan, void *data);
>
> int main()
> {
> PassData *pd;
> float t = 0.0f;
> char* filename = "esprit.pfb";
> int i,j;
> pfScene *scene;
> pfNode *root;
> pfPipe *p;
> pfPipeWindow *pw;
> pfChannel *chan;
> pfSphere bsphere;
> pfEarthSky *esky;
> static int fbattr[] =
> {PFFB_RGBA,PFFB_DOUBLEBUFFER,PFFB_DEPTH_SIZE, 24,
> PFFB_RED_SIZE, 8,PFFB_SAMPLES, 8,PFFB_STENCIL_SIZE,
> 1,NULL,};
>
> /* Initialize Performer */
> pfInit();
> /* Use default multiprocessing mode based on number of
> * processors.
> */
> pfMultiprocess( PFMP_DEFAULT );
> /* Load all loader DSO's before pfConfig() forks */
> pfdInitConverter(filename);
> /* initiate multi-processing mode set in pfMultiprocess call
> * FORKs for Performer processes, CULL and DRAW, etc. happen here.
> */
> pfConfig();
>
> /* Append to Performer search path, PFPATH, files in
> * /usr/share/Performer/data */
> pfFilePath(".:/usr/share/Performer/data");
> /* Read a single file, of any known type. */
> if ((root = pfdLoadFile(filename)) == NULL)
> {
> pfExit();
> exit(-1);
> }
>
> /* Attach loaded file to a new pfScene. */
> scene = pfNewScene();
> pfAddChild(scene, root);
> /* 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, "OpenGL Performer");
> pfPWinOriginSize(pw, 0, 0, winWidth,winHeight);
> //pfPWinFBConfigAttrs(pw,fbattr);
> /* Open and configure the GL window. */
> pfOpenPWin(pw);
>
> /* Create and configure a pfChannel. */
> chan = pfNewChan(p);
> pfChanScene(chan, scene);
> pfChanFOV(chan, 45.0f, 0.0f);
>
> /* determine extent of scene's geometry */
> pfGetNodeBSphere (root, &bsphere);
> pfChanNearFar(chan, 1.0f, 10.0f * bsphere.radius);
> pfFrame();
> /* allocate passthrough data */
> pd = (PassData*)pfAllocChanData(chan,sizeof(PassData));
> /* initialize channel callbacks */
> /* Data intialization */
>
> //pfChanTravFunc(chan, PFTRAV_CULL, cullFunc);
> pfChanTravFunc(chan, PFTRAV_DRAW, drawFunc);
>
> /* main simulation loop */
> while(1)
> {
> pfCoord view;
> float s, c;
> pfSync();
> //pd->val = 0;
> pfPassChanData(chan);
> pfFrame();
> 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);
> }
>
> /* Terminate parallel processes and exit. */
> pfExit();
> return 0;
> }
> void cullFunc(pfChannel *chan, void *data)
> {
> PassData *pd = (PassData*)data;
> pd->val++;
> pfCull();
> }
>
> void drawFunc(pfChannel *chan, void *data)
> {
> GLubyte imagebuffer[500][500][3];
> int i,j;
> int c;
> pfVec3 farPlaneLL,dummy;
> for (i = 0; i < winWidth; i++) {
> for (j = 0; j < winHeight; j++) {
> c = ((((i&0x8)==0)^((j&0x8))==0))*255;
> imagebuffer[i][j][0] = (GLubyte) c;
> imagebuffer[i][j][1] = (GLubyte) c;
> imagebuffer[i][j][2] = (GLubyte) c;
> //imagebuffer[i][j][3] = (GLubyte) 255;
> }
> }
>
> pfClearChan(chan);
> pfDraw();
> pfPushState();
> pfBasicState();
> glClearStencil(0x0);
> glClear(GL_STENCIL_BUFFER_BIT);
>
> glPixelStorei(GL_UNPACK_ALIGNMENT,1);
> glDepthFunc(GL_ALWAYS);
> glDepthMask(GL_FALSE);
> glPushMatrix();
> pfGetChanFar(chan, farPlaneLL, dummy, dummy, dummy);
> //glTranslatef(0.0f,0.0f,farPlaneLL[2]*0.9);
> glTranslatef(0.0f,farPlaneLL[2]*0.005,2.0);
>
> glRasterPos2i(0.0f,0.0f);
> glDrawPixels(winWidth, winHeight, GL_RGB,GL_UNSIGNED_BYTE,
> imagebuffer);
> glPopMatrix();
> glDepthFunc(GL_LEQUAL);
> glDepthMask(GL_TRUE);
>
> pfPopState();
> }
>
> Rajesh.R
> Virtual Reality
> Institute for Robotics and Virtual Reality
> c/o Centre for AI and Robotics
> Defence Research and Development Organization (DRDO)
> Ministry of Defence
> Bangalore - 1
>
> Scientists are people of very dissimilar temperaments
> doing different things in very different ways. Among
> scientists are collectors, classifiers and compulsive
> tidiers-up; many are detectives by temperament and many
> are explorers; some are artists and others artisans.
> There are poet-scientists and philosopher-scientists and
> even a few mystics."
>
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-- +---------------------------------+----------------------------------+ |Benedikt J. Kessler | Silicon Graphics GmbH | |Advanced Media Products | Am Hochacker 3 - Technopark | |SGI | 85630 Grasbrunn-Neukeferloh, FRG | | --- __o ,__o | | | ------_ \<,_ _-\_<, | Phone: (+49) 89 46108-366 or -0 | |----- (*)/ (*) (*)/'(*) | Fax: (+49) 89 46107-366 | +---------------------------------+----------------------------------+ |E-Mail: bjk++at++sgi.com Web (private): http://sgiweb.org/bjk | | Web: http://www.sgi.de | +--------------------------------------------------------------------+
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