On 12 December 2012 10:21, Paul Berry <stereotype...@gmail.com> wrote:
> On 12 December 2012 09:09, Marek Olšák <mar...@gmail.com> wrote: > >> R300 and R400 support 4 texture indirections (as defined by >> ARB_fragment_program). Adding ALU instructions before the first TEX >> instruction increases the number of texture indirections by 1, which >> might make some shaders not be executable on the hardware at all. >> >> I think this optimization should be disabled on drivers where the >> texture indirection limit is too low. >> >> Marek >> > > Hmm, I see. Follow up question: > > My patches implement varying packing in two ways: (a) within a composite > varying (such as a matrix or array varying) and (b) between varyings. > Disabling (b) on some drivers would be pretty simple. Disabling (a) would > be more of a pain, because it would require there to be two paths to handle > transform feedback, one that understands how to do feedback for packed > varyings, and one that understands how to do feedback for unpacked > varyings. I was kind of hoping we could avoid that. Do you think it would > be adequate to disable just (b) on R300 and R400, or do you think we have > to disable both (a) and (b) on R300 and R400? > Come to think of it, do R300 and R400 support transform feedback at all? If not, then this would be a lot easier.
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