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-rw-r--r--src/mesa/drivers/dri/i965/brw_wm_emit.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_wm_emit.c b/src/mesa/drivers/dri/i965/brw_wm_emit.c
index b3cf524c63..5f29ca1cd4 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_emit.c
@@ -588,17 +588,19 @@ static void emit_dph( struct brw_compile *p,
const struct brw_reg *arg0,
const struct brw_reg *arg1 )
{
+ const int dst_chan = _mesa_ffs(mask & WRITEMASK_XYZW) - 1;
+
if (!(mask & WRITEMASK_XYZW))
return; /* Do not emit dead code */
- assert((mask & WRITEMASK_XYZW) == WRITEMASK_X);
+ assert(is_power_of_two(mask & WRITEMASK_XYZW));
brw_MUL(p, brw_null_reg(), arg0[0], arg1[0]);
brw_MAC(p, brw_null_reg(), arg0[1], arg1[1]);
- brw_MAC(p, dst[0], arg0[2], arg1[2]);
+ brw_MAC(p, dst[dst_chan], arg0[2], arg1[2]);
brw_set_saturate(p, (mask & SATURATE) ? 1 : 0);
- brw_ADD(p, dst[0], dst[0], arg1[3]);
+ brw_ADD(p, dst[dst_chan], dst[dst_chan], arg1[3]);
brw_set_saturate(p, 0);
}