gallium/st: add pipe_context::get_timestamp()

The VMware svga driver doesn't directly support pipe_screen::get_timestamp()
but we can do a work-around.  However, we need a gallium context to do so.
This patch adds a new pipe_context::get_timestamp() function that will only
be called if the pipe_screen::get_timestamp() function is NULL.

Signed-off-by: Brian Paul <[email protected]>

1 files changed, 11 insertions, 2 deletions

diff --git a/src/mesa/state_tracker/st_cb_queryobj.c b/src/mesa/state_tracker/st_cb_queryobj.c
index 71222e80b6b..aafae16b2df 100644
--- a/src/mesa/state_tracker/st_cb_queryobj.c
+++ b/src/mesa/state_tracker/st_cb_queryobj.c
@@ -289,9 +289,18 @@ st_CheckQuery(struct gl_context *ctx, struct gl_query_object *q)
 static uint64_t
 st_GetTimestamp(struct gl_context *ctx)
 {
-   struct pipe_screen *screen = st_context(ctx)->pipe->screen;
+   struct pipe_context *pipe = st_context(ctx)->pipe;
+   struct pipe_screen *screen = pipe->screen;
 
-   return screen->get_timestamp(screen);
+   /* Prefer the per-screen function */
+   if (screen->get_timestamp) {
+      return screen->get_timestamp(screen);
+   }
+   else {
+      /* Fall back to the per-context function */
+      assert(pipe->get_timestamp);
+      return pipe->get_timestamp(pipe);
+   }
 }