Re: O2 pixel fill rates

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Ho Eng Keong (eng40009++at++leonis.nus.edu.sg)
Thu, 5 Feb 1998 16:37:23 +0800 (SST)

Hi,

I have a question regarding PFTEX_SUBLOAD_FORMAT

I have a set of 2D textures which are stacked together to simulate
the so-called 3D texturing. As i want to apply changes to the textures,
thus I tried to subload only the changed part into the hardware without
reformatting the textures. Below is my code:

void subload() {

   ViewState->subtex = new pfTexture;
   ViewState->subtex = ViewState->voltex;

   //voltex is the initial texture on which changes are to be made

   ViewState->voltex->setFormat(PFTEX_SUBLOAD_FORMAT, PF_ON);

...

However, every time the program reaches ViewState->subtex->setFormat, it
crashes with :

X Error of failed request: BadLength (poly request too large or internal
Xlib length error)
  Major opcode of failed request: 140 (GLX)
  Minor opcode of failed request: 1 (X_GLXRender)
  Serial number of failed request: 279
  Current serial number in output stream: 280

So what did I do wrong?

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