José Fonseca wrote:
>
> The previous mail got badly formated. I'm sending again the broken lines.
>
> ...
>
> 0000: 00000000 /* placeholder for a command */
> 0004: ???????? /* VERTEX_1_S */
> 0008: ???????? /* VERTEX_1_T */
> 000c: ???????? /* VERTEX_1_W */
> 0010: ???????? /* VERTEX_1_SPEC_ARGB */
> 0014: ???????? /* VERTEX_1_Z */
> 0018: ???????? /* VERTEX_1_ARGB */
> 001c: ???????? /* VERTEX_1_XY */
> 0020: 00000000 /* placeholder for a command */
> 0024: ???????? /* VERTEX_1_SECONDARY_S */
> 0028: ???????? /* VERTEX_1_SECONDARY_T */
> 002c: ???????? /* VERTEX_1_SECONDARY_W */
> 0030: ... /* the same as above for vertex 2, 3, and so on */
>
> The DRM would unmap this buffer to prevent further tampering, and it would
> then add the commands:
>
> 0000: (MACH64_VERTEX_1_S) | (6<<16) /* setup for programming seven
> sequential registers */
> 0004: ???????? /* VERTEX_1_S */
> 0008: ???????? /* VERTEX_1_T */
> 000c: ???????? /* VERTEX_1_W */
> 0010: ???????? /* VERTEX_1_SPEC_ARGB */
> 0014: ???????? /* VERTEX_1_Z */
> 0018: ???????? /* VERTEX_1_ARGB */
> 001c: ???????? /* VERTEX_1_XY */
> 0020: (MACH64_VERTEX_1_SECONDARY_S) | (2<<16) /* setup for programming
> three sequential registers */
> 0024: ???????? /* VERTEX_1_SECONDARY_S */
> 0028: ???????? /* VERTEX_1_SECONDARY_T */
> 002c: ???????? /* VERTEX_1_SECONDARY_W */
> 0030: ...
The advantages of doing it this way:
- unmapping rather than copying the data is probably faster.
- no need to reformat data in kernel space.
The disadvantages:
- you have to re-write '_vbtmp.h' and maybe '_tritmp.h", and keep these
uptodate with any bugfixes
- the driver looks less like the other drivers and it is harder to incoperate
new optimizations.
- unmapping is more complex than copying.
It's probably a matter of personal choice...
Keith
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