Re: [R300] shimmering_gears snapshot

[Keith W. <ke...@tu...>]

Vladimir Dergachev wrote:
>>> debugging messages, you should get about 1000 fps.
>>>
>>>     I hand tweaked 4-th coordinates of vertices and colors to display 
>>> something sensible. Does Mesa actually use those ? (Especially color 
>>> ones).
>>
>>
>> Yes, but you have to respect the 'size' parameter of the vertex 
>> arrays.  Eg. if size == 2, then you either have to supply the last two 
>> components of the array yourself, or preferably program the hardware 
>> to only expect the first two components.  Where size < 4, the missing 
>> components come from the vector {0,0,0,1}.
> 
> 
> Thank you ! - this was very helpful.
> 
> Could you tell me what struct vertex_buffer->Size field does ?

This is the maximum number of vertices the buffer is able to hold.  It's 
probably not a value that you need to look at much in a driver.  The 
field VB->Count is more useful, and contains the current number of 
vertices in the VB.

Keith