Re: [Dri-devel] GL_NV_texture_rectangle on radeon

[Brian P. <br...@tu...>]

Keith Whitwell wrote:
> Andreas Stenglein wrote:
> 
>> Am 2003.06.10 12:12:56 +0200 schrieb(en) Keith Whitwell:
>>
>>> Keith Whitwell wrote:
>>>
>>>> Andreas Stenglein wrote:
>>>>
>>>>> @keithw: here is another version.
>>>>>
>>>>> yuvrect.c seems to work
>>>>> texrect.c still doesnt work
>>>>>
>>>>> any hints?
>>>>
>>>>
>>>>
>>>
>>> OK, the final piece of the puzzle fell into place.  Without the 
>>> radeon docs you might hav had trouble find this -- basically, the 
>>> radeon still expects texture rectangle texcoords to be in 0..1 range, 
>>> rather than 0..width,0..height like the r200.
>>>
>>> I haven't got the code running for this yet, but modifying the app to 
>>> supply the texcoords the hardware expects gives a good image.
>>>
>>> Keith
>>>
>> yes, its unbelievable... it works with texcoords 0...1 ;)
>>
>> 1) Do you have an idea how to make it work with the right texcoords?
> 
> 
> I was thinking that this would be a fairly easy option:
> 
> a) Disable TCL for all rectangular texture operations
> b) Insert a new stage to the swtcl pipeline, based on 
> Mesa/src/tnl/t_vb_texmat.c, to perform a 1/w, 1/h scale to all texrect 
> coordinates.

c) premultiply the texture matrix by a scaling matrix?

-Brian