i965: Track the number of samples in the drawbuffer.

This keeps us from having to emit the nonpipelined state packet on every
FBO binding.

-4.42003% +/- 1.09961% effect on cairo-perf-trace runtime on glamor (n=110).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_state_upload.c b/src/mesa/drivers/dri/i965/brw_state_upload.c
index 7ae2e1e..3a452c3 100644
--- a/src/mesa/drivers/dri/i965/brw_state_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_state_upload.c
@@ -507,6 +507,7 @@ static struct dirty_bit_map brw_bits[] = {
    DEFINE_BIT(BRW_NEW_META_IN_PROGRESS),
    DEFINE_BIT(BRW_NEW_INTERPOLATION_MAP),
    DEFINE_BIT(BRW_NEW_PUSH_CONSTANT_ALLOCATION),
+   DEFINE_BIT(BRW_NEW_NUM_SAMPLES),
    {0, 0, 0}
 };
 
@@ -604,6 +605,11 @@ void brw_upload_state(struct brw_context *brw)
       brw->state.dirty.brw |= BRW_NEW_META_IN_PROGRESS;
    }
 
+   if (brw->num_samples != ctx->DrawBuffer->Visual.samples) {
+      brw->num_samples = ctx->DrawBuffer->Visual.samples;
+      brw->state.dirty.brw |= BRW_NEW_NUM_SAMPLES;
+   }
+
    if ((state->mesa | state->cache | state->brw) == 0)
       return;