Hi While working on my little engine I want to use pbuffers for offscren rendering to textures... After downloading a few tutorials from NVIDIA and read through a few papers I got to work, trying to implement pbuffers in my shaders... No success... :-( I copy the rendered result to a texture and rendered the result, pitch black! The copy part seems to work... I´ve copied parts of the back-buffer and that worked... But thats no fun... The code in the tutorial works...in the tutorial but not in my framework... My guess is that my framework, containing old code which does not use wglChoosePixelFormatARB, is the one causing me trouble? //Context creation if (!(PixelFormat=ChoosePixelFormat(m_hDC,&pfd))) { } if(!SetPixelFormat(m_hDC,PixelFormat,&pfd)) { // Return FALSE } So what i wonder is if anyone else have had these problems? Or stumbled on a solution? yours...

Perhaps this may helps you:

if you want to render directly into a texture you should
do something like this:


hdc = wglGetCurrentDC();
hrc = wglGetCurrentContext();

depth_bits = depthbits;
color_bits = colorbits;
pb_width = width;
pb_height = height;

int format;
int pformat[MAX_PFORMATS];
unsigned int nformats;
int iattributes[2*MAX_ATTRIBS];
float fattributes[2*MAX_ATTRIBS];
int nfattribs = 0;
int niattribs = 0;

memset(iattributes,0,sizeof(int)*2*MAX_ATTRIBS);
memset(fattributes,0,sizeof(float)*2*MAX_ATTRIBS);

iattributes[niattribs ] = WGL_DRAW_TO_PBUFFER_ARB;
iattributes[++niattribs] = true;

iattributes[++niattribs] = WGL_COLOR_BITS_ARB;
iattributes[++niattribs] = color_bits;

iattributes[++niattribs] = WGL_DEPTH_BITS_ARB;
iattributes[++niattribs] = depth_bits;

iattributes[++niattribs] = WGL_BIND_TO_TEXTURE_RECTANGLE_RGBA_NV;
iattributes[++niattribs] = true;


if (!wglChoosePixelFormatARB( hdc, iattributes, fattributes, MAX_PFORMATS, pformat, &nformats))
{
return false;
}

format = pformat[0];

memset(iattributes,0,sizeof(int)*2*MAX_ATTRIBS);
niattribs = 0;

iattributes[niattribs] = WGL_TEXTURE_FORMAT_ARB;
iattributes[++niattribs] = WGL_TEXTURE_RGBA_ARB;

iattributes[++niattribs] = WGL_TEXTURE_TARGET_ARB;
iattributes[++niattribs] = WGL_TEXTURE_RECTANGLE_NV;

iattributes[++niattribs] = WGL_PBUFFER_LARGEST_ARB;
iattributes[++niattribs] = true;

hpbuffer = wglCreatePbufferARB( hdc, format, pb_width, pb_height, iattributes );
if (hpbuffer == 0)
{
return false;
}
pb_hdc = wglGetPbufferDCARB(hpbuffer);
if (pb_hdc == 0)
{
return false;
}
pb_hrc = wglCreateContext(pb_hdc);
if (pb_hrc == 0)
{
return false;
}

if (wglMakeCurrent(hdc, hrc) == FALSE) return false;

if (share)
wglShareLists(hrc, pb_hrc);

wglQueryPbufferARB(hpbuffer, WGL_PBUFFER_WIDTH_ARB, &pb_width);
wglQueryPbufferARB(hpbuffer, WGL_PBUFFER_HEIGHT_ARB, &pb_height);

if (wglMakeCurrent(hdc, hrc) == FALSE) return false;


for more info go to my homepage www.beam.to/panorama -> releases and download the source of my demo "black and white", there are several offsccreen-buffers used

Thanx!


browsing your source...