[PATCH v2 04/17] etnaviv: Use only DRAW_INSTANCED on GC3000+

[Wladimir J. van der Laan]

> Can confirm that this completely breaks rendering on GC3000.
> 
> I don't know how this happened, I'm sure I tested this before :( maybe
> with a slightly different version of the patch stack.

Solved!

Etnaviv is emitting vertex stream attributes in an unconvential way:

- Write vertex stream address 0 to 0064C
- Then writing vertex stream address 1..n to 00684+n*4
- Write vertex stream control 0 to 00650
- Writing vertex stream control 1..n to 006A4+n*4

Apparently this no longer works with DRAW_INSTANCED.

Will send a patch to fix this; a better way would be to use 00684/006A8 only on
single-vertex-stream GPUs, otherwise write consecutively.

(I must already had this patched locally when I tested this, but regarded as
unnecessary later...)

Wladimir