[Mesa-dev] [PATCH 09/16] st/nine: Fix D3DQUERYTYPE_TIMESTAMPFREQ query

[Axel Davy]

From: Xavier Bouchoux <xavierb at gmail.com>

D3DQUERYTYPE_TIMESTAMPFREQ is supposed to give the frequency
at which the clock of D3DQUERYTYPE_TIMESTAMP runs.

PIPE_QUERY_TIMESTAMP returns a value in ns, thus the corresponding
frequency is 1000000000.
PIPE_QUERY_TIMESTAMP_DISJOINT returns the frequency at which
PIPE_QUERY_TIMESTAMP value is updated. It isn't always
1000000000.

Reviewed-by: Axel Davy <axel.davy at ens.fr>
Signed-off-by: Xavier Bouchoux <xavierb at gmail.com>
---
 src/gallium/state_trackers/nine/query9.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/gallium/state_trackers/nine/query9.c b/src/gallium/state_trackers/nine/query9.c
index 466b4ba..df49340 100644
--- a/src/gallium/state_trackers/nine/query9.c
+++ b/src/gallium/state_trackers/nine/query9.c
@@ -254,7 +254,15 @@ NineQuery9_GetData( struct NineQuery9 *This,
         nresult.b = presult.timestamp_disjoint.disjoint;
         break;
     case D3DQUERYTYPE_TIMESTAMPFREQ:
-        nresult.u64 = presult.timestamp_disjoint.frequency;
+        /* Applications use it to convert the TIMESTAMP value to time.
+           AMD drivers on win seem to return the actual hardware clock
+           resolution and corresponding values in TIMESTAMP.
+           However, this behaviour is not easy to replicate here.
+           So instead we do what wine and opengl do, and use
+           nanoseconds TIMESTAMPs.
+           (Which is also the unit used by PIPE_QUERY_TIMESTAMP.)
+        */
+        nresult.u64 = 1000000000;
         break;
     case D3DQUERYTYPE_VERTEXSTATS:
         nresult.vertexstats.NumRenderedTriangles =
-- 
2.1.0