From: Benedikt Kessler (bjk++at++munich.sgi.com)
Date: 10/05/2001 03:10:38
Hi!
??? wrote:
>
> Oh~ Sorry...
>
> Additional promblem is come.
>
> My program is loading many texture data in advance.
>
> This loading code using "glGenTexture() and glTexImage()..." is called in channelSetup() function. (Maybe not DRAW process)
As I told you already: This will work only in single processor mode. But
you can create pfTexGen and pfTexture objects in the APP process (see
below) and download/use them in the DRAW process.
> But My program is working very well my workstation. (in Single process)
>
> My workstation is SGI Octane R12000, V8 Graphicboard , 384MM.
>
> And I have tried to run this program(same perfectly) at CAVE system.
> (This system is 5 pipe, 20(?) process)
>
> But this program didn't work at CAVE system.
>
> Following warning message printed at run time :
>
> PF Warning/Usage: No hardware support for VSYNC, frame sync may vary.Assuming 60Hz.
> PF Warning/Usage: pfGetVClock() not supported for this context.
??? Did you run your application remotely (having the DISPLAY on your
Octane)? That might explaint the two warnings above...
> In my opinion..this problem is come becase calling GL function in not DRAW process.
>
> So, I have tried to call GL function DRAW process.
>
> In advance loading texture data in main memory, and load texture by calling glTexGen, glTexImage in DRAW process.
>
> Then program working . but bad performence...--;
How about creating pfTexGen, pfTexture and pfGeoState and letting
Performer do the rest for you? You might look at the example on how to
download textures using pfuDownloadTexList in
/usr/share/Performer/src/pguide/libpf/C/bench.c (pr perfly)
static void
DrawChannel (pfChannel *channel, void *data)
{
static int first=1;
if (first)
{
pfuDownloadTexList(Shared->texList, PFUTEX_SHOW);
first=0;
}
...
> Because, in DRAW process, I have load only needed texture.
> If load total texture in first DRAW process(using flag), this is not working. Only first texture is displayed...--;
Be aware to do the download all textures (only once) on all pipes (all
draw processes) that you have.
> I want to load many texture data into texture memory in advance for good
> performence.
Yes thats the recommended way.
Bye! Benedikt
> What I can do? How can I load texture into texture memory? Please answer my question.
>
> Im, Moo Jin
>
> ----- Original Message -----
> From: "Benedikt Kessler" <bjk++at++munich.sgi.com>
> To: "��¹«�ø" <yamoo++at++grmanet.sogang.ac.kr>
> Cc: <info-performer++at++sgi.com>
> Sent: Thursday, October 04, 2001 4:37 PM
> Subject: Re: Texture Problem using Opengl in Performer
>
> > Hi!
> >
> > I assume that you're running in sigle process mode; If not you will have
> > crashes calling OpenGL calls in the APP or CULL processes as they do bat
> > have a graphics context. So calling glGenTextures (or any other gl*
> > call) will only be allowed in the DRAW process.
> >
> > By calling glGenTextures(1, texture) only the first element (index 0!!!)
> > of the texture array is initialized; that means that you must call:
> >
> > glBindTexture(GL_TEXTURE_2D, texture[0]);
> > ^^^ instead of 1!!!
> >
> > So both the sample code and your own code were wrong...
> >
> > You might also either call glTexParameteri(GL_TEXTURE_2D,
> > GL_TEXTURE_MIN_FILTER, GL_LINEAR); or define all mipmap levels in your
> > code! For the default GL_NEAREST_MIPMAP_LINEAR minification filter all
> > mipmap levels must be defined (or no texturing is used).
> >
> >
> > Bye! Benedikt
> >
> >
> >
> > > Hi..
> > >
> > > I am student of Sogang Univ. in Seoul, Korea, and my name is Im, Moo
> > > Jin...
> > >
> > > I saw the following reply at Info-Performer Mailing List (2000.10)
> > >
> > > ------------------------------------------------------------------------------------
> > >
> > > Hi,
> > >
> > > did you use glGenTextures to generate the texture name? I did the same
> > >
> > > thing and it worked out well. Here is what I did (the main idea):
> > >
> > > Init time:
> > > glGenTextures(1, texture)
> > >
> > > Post Draw time:
> > > // copy frame buffer to texture
> > > glBindTextureEXT(GL_TEXTURE_2D,texture[1]);
> > > glCopyTexSubImage2DEXT(GL_TEXTURE_2D, 0, 0, 0, 0, 0, sizeX, sizeY);
> > >
> > > // draw textured quad with frame buffer texture
> > > pfPushIdentMatrix();
> > > pfEnable(PFEN_TEXTURE);
> > > glEnable(GL_TEXTURE_2D);
> > > glBindTextureEXT(GL_TEXTURE_2D,texture[1]);
> > > glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
> > > glBegin(GL_QUADS);
> > > glColor4f(1.0f,1.0f,1.0f,1.0f);
> > > glTexCoord2f(0.0f,0.0f); glVertex2f(-1.0f,-1.0f);
> > > glTexCoord2f(1.0f,0.0f); glVertex2f(1.007f,-1.0f);
> > > glTexCoord2f(1.0f,1.0f); glVertex2f(1.007f,1.005f);
> > > glTexCoord2f(0.0f,1.0f); glVertex2f(-1.0f,1.005f);
> > > glEnd();
> > >
> > > regards, Sylvain
> > >
> > > ------------------------------------------------------------------------------------
> > >
> > > So. I programming refer to this code.
> > >
> > > I want programming simple 2d texture code using OpenGL.
> > >
> > > My code is :
> > >
> > > ------------------------------------------------------------------------------------
> > >
> > > In Main Function :
> > >
> > > /* This is from Opengl Programming Guide */
> > > glGenTextures(1, texture);
> > > for(i=0; i<checkImageHeight; i++) {
> > >
> > > for(j=0; j<checkImageWidth; j++) {
> > > c = ((((i&0x8)==0)^((j&0x8))==0))*255;
> > > checkImage[i][j][0] = (GLubyte) c;
> > > checkImage[i][j][1] = (GLubyte) c;
> > > checkImage[i][j][2] = (GLubyte) c;
> > > checkImage[i][j][3] = (GLubyte) 255;
> > > }
> > > }
> > > glBindTextureEXT(GL_TEXTURE_2D, texture[1]);
> > > glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
> > > checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
> > > checkImage);
> > >
> > > In channelSetup Function :
> > >
> > > pfChanTravFunc(chan, PFTRAV_DRAW, drawHUD);
> > >
> > > In drawHUD Function :
> > >
> > > {
> > >
> > > pfClearChan(chan);
> > > pfDraw();
> > >
> > > /* post draw */
> > > pfPushIdentMatrix();
> > > pfEnable(PFEN_TEXTURE);
> > > glEnable(GL_TEXTURE_2D);
> >
> > no need to glEnable(GL_TEXTURE_2D); if pfEnable(PFEN_TEXTURE); is
> > already used.
> >
> >
> > > glBindTextureEXT(GL_TEXTURE_2D, texture[1]);
> > > glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
> > >
> > > glBegin(GL_QUADS);
> > > glColor4f(1.0, 1.0, 1.0, 1.0);
> > > glTexCoord2f(0.0, 0.0); glVertex2f(-1.0f,-1.0f);
> > > glTexCoord2f(1.0, 0.0); glVertex2f( 1.0f,-1.0f);
> > > glTexCoord2f(1.0, 1.0); glVertex2f( 1.0f, 1.0f);
> > > glTexCoord2f(0.0, 1.0); glVertex2f(-1.0f, 1.0f);
> > > glEnd();
> > > }
> > >
> > > ------------------------------------------------------------------------------------
> > >
> > > Please check my code..
> > >
> > > What is the problem...?
> > >
> > > Because this problem, I can't proceed my job.
> > >
> > > Please answer my question.
> > >
> > > Besides if possible, send me sample texture program code using Opengl.
> > >
> > >
> > >
> > > Im, Moo Jin
> > >
> > > p.s. Sorry, My terrible English..:-)
-- +---------------------------------+----------------------------------+ |Benedikt J. Kessler | Silicon Graphics GmbH | |Professional Services | 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://reality.sgi.com/bjk | | Web: http://www.sgi.de/dienstleistungen/ | +--------------------------------------------------------------------+
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