Vertex Array Range (nvidia) Problem!!

[TheBlob]

Hi!
I have troubles getting VAR working!
I try to allocate some memory, but i always get a nullpointer...
Here´s my code:

		unsigned char *AGPMemory; 
 
		if(VARSupported)
		{
			// This call allocates Memory in AGP-Memory!!
			AGPMemory = (unsigned char*)wglAllocateMemoryNV(1024*sizeof(float), 0.2f, 0.2f, 0.5f);
 
			if (!AGPMemory)
			{
				//No AGP Memory available
				VARSupported = false;
			}
			else
			{
				//Everything worked fine and the memory could be allocated...
 
				//...Proceed with memcopy etc.
 
			}
 
		}

But actually it´s always !AGPMemory .... so waht´s wrong with that
BTW: The NVIDIA demos workes perfectly, so it can´t be my machine....

[PH]

Hi Mr.Blob , try these values for wglAllocateMemoryNV( 1024*sizeof(float), 0, 0.1f, 0.75f ).

[TheBlob]

Well, I tried those values, but it sill doesn´t work...
Or my check-code is not correct?? I dunno...
Please help me!

[Nutty]

Are you sure you have a valid OpenGL rendering context, when you do this? I assume you do, or you wouldn't have been able to get the address of the allocate function. But thats all I can think of.

Nutty

[jwatte]

That. Or your machine doesn't have the right AGP drivers installed (common on VIA chipset machines, I hear). Or your card is actually a PCI card, so there is no AGP memory. Or you are out of AGP memory. Or one of a million other things.

It's perfectly fine for AllocateMemory() to return NULL; the fallback case is to use malloc() for your memory. You can still call VertexArrayRange() on malloc()-ed memory, and it will still make vertex arrays draw faster when they're in that memory.

bool inMalloc = false;
void * varMemory = 0;
 
void init()
{
  inMalloc = false;
  if( !(varMemory = wglAllocateMemory(...)) ) {
    varMemory = malloc(...);
    inMalloc = true;
  }
  glVertexArrayRangeNV(varMemory,...);
  glEnable(GL_VERTEX_ARRAY_RANGE_NV);
}
 
void terminate()
{
  glDisable(GL_VERTEX_ARRAY_RANGE_NV);
  if( inMalloc ) {
    free(varMemory);
  }
  else {
    wglFreeMemory(...,varMemory);
  }
}

[This message has been edited by jwatte (edited 06-09-2002).]

[AdrianD]

i had this problem too... does you driver support AGP ?
check out the renderer string.
if you have a pci-version only (this can be true even on agp machines) then try to allocate videomem with: glAllocateMemoryNV(size,0,0,1);

[Nutty]

Although he said the nvidia demos work fine, I suppose he should verify that they are allocating AGP memory. Perhaps they're just falling back to video memory, or sys memory.

[AdrianD]

nutty, you are right. the nvidia demos check for AGP mem first, and when they can't allocate it, they allocate pure videomem.

[davepermen]

http://tyrannen.starcraft3d.net/PerPixelLighting

try this app, it reports from where the mem is allocated..

[TheBlob]

Ok, I treid the app and I found out that it´s allocating the memory in GeForce RAM i.e video-mem. I have a GeForce1, but actually i thought the GeForce would provide AGP Memory...the problem is, that i wnat to allocate about 1024*1024*11 bytes *g*! That´s a little bit too much for VideoMem!
But I Can´t help it...thank you!