On Thu, 3 Feb 2005, Rune Petersen wrote:
> > You are quite right - also the following instruction:
> >
> > {
> > EASY_PFS_INSTR0(MAD, SRC0C_XYZ, ONE, ZERO),
> > EASY_PFS_INSTR1(0, 0, 0 | PFS_FLAG_CONST, 0 | PFS_FLAG_CONST, NONE,
> > ALL),
> > EASY_PFS_INSTR2(MAD, SRC0A, ONE, ZERO),
> > EASY_PFS_INSTR3(0, 0, 0 | PFS_FLAG_CONST, 0 | PFS_FLAG_CONST, OUTPUT)
> > }
> >
> > looks like a NOP ( it basically does reg0<-reg0*1+0.0 ).
>
> with some more testing I found:
> - FLAT_COLOR_PIXEL_SHADER needs 2 NOP when resizing window->full screen
> to avoid corruption. Can you add these NOPs only when resizing? =)
>
> - SINGLE_TEXTURE_VERTEX_SHADER needs 1 NOP to get q3a to work for me.
> else get a blank screen. The game runs fine I just can't see anything.
> The NOP might be needed for the initial setup.
Makes sense... if you have to have all instructions take one cycle
scheduling wise, but some need more, then you need NOPs. Since this
instruction system wasn't designed to be programmed directly by end users,
it didn't bother the hardware designers ;)
One of these days I'd like to check this driver out - I have a
radeon 9500non-pro and a 9800pro, although my main box has a gf6800...
- Chad
> Rune Petersen
>
>
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