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r300/compiler: Fix vertex shader MAD instructions with constant swizzles

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(cherry picked from commit d8361400b7)
This commit is contained in:
Tom Stellard 2011-04-05 00:04:45 -07:00
parent 4633054b8b
commit b8050add56
1 changed files with 18 additions and 0 deletions
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18
src/mesa/drivers/dri/r300/compiler/r3xx_vertprog.c
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@ -272,6 +272,7 @@ static void ei_mad(struct r300_vertex_program_code *vp,
struct rc_sub_instruction *vpi,
unsigned int * inst)
{
unsigned int i;
/* Remarks about hardware limitations of MAD
* (please preserve this comment, as this information is _NOT_
* in the documentation provided by AMD).
@ -317,6 +318,23 @@ static void ei_mad(struct r300_vertex_program_code *vp,
t_dst_index(vp, &vpi->DstReg),
t_dst_mask(vpi->DstReg.WriteMask),
t_dst_class(vpi->DstReg.File));
/* Arguments with constant swizzles still count as a unique
* temporary, so we should make sure these arguments share a
* register index with one of the other arguments. */
for (i = 0; i < 3; i++) {
unsigned int j;
if (vpi->SrcReg[i].File != RC_FILE_NONE)
continue;
for (j = 0; j < 3; j++) {
if (i != j) {
vpi->SrcReg[i].Index =
vpi->SrcReg[j].Index;
break;
}
}
}
}
inst[1] = t_src(vp, &vpi->SrcReg[0]);
inst[2] = t_src(vp, &vpi->SrcReg[1]);