Implement query object interface.

This replaces the temporary occlusion counter functions we had before.
Added new ctx->Driver.WaitQuery() function which should block until the result is ready.
Sketch out some code for vertex transformation feedback counters.

3 files changed, 39 insertions, 13 deletions

diff --git a/src/mesa/pipe/softpipe/sp_context.c b/src/mesa/pipe/softpipe/sp_context.c
index 26453d9785..92357808e2 100644
--- a/src/mesa/pipe/softpipe/sp_context.c
+++ b/src/mesa/pipe/softpipe/sp_context.c
@@ -195,19 +195,37 @@ static void softpipe_destroy( struct pipe_context *pipe )
 }
 
 
-static void softpipe_reset_occlusion_counter(struct pipe_context *pipe)
+static void
+softpipe_begin_query(struct pipe_context *pipe, struct pipe_query_object *q)
 {
    struct softpipe_context *softpipe = softpipe_context( pipe );
-   softpipe->occlusion_counter = 0;
+   assert(q->type < PIPE_QUERY_TYPES);
+   assert(!softpipe->queries[q->type]);
+   softpipe->queries[q->type] = q;
 }
 
-/* XXX pipe param should be const */
-static unsigned softpipe_get_occlusion_counter(struct pipe_context *pipe)
+
+static void
+softpipe_end_query(struct pipe_context *pipe, struct pipe_query_object *q)
 {
    struct softpipe_context *softpipe = softpipe_context( pipe );
-   return softpipe->occlusion_counter;
+   assert(q->type < PIPE_QUERY_TYPES);
+   assert(softpipe->queries[q->type]);
+   q->ready = 1;  /* software rendering is synchronous */
+   softpipe->queries[q->type] = NULL;
+}
+
+
+static void
+softpipe_wait_query(struct pipe_context *pipe, struct pipe_query_object *q)
+{
+   /* Should never get here since we indicated that the result was
+    * ready in softpipe_end_query().
+    */
+   assert(0);
 }
 
+
 static const char *softpipe_get_name( struct pipe_context *pipe )
 {
    return "softpipe";
@@ -260,8 +278,11 @@ struct pipe_context *softpipe_create( struct pipe_winsys *pipe_winsys,
 
    softpipe->pipe.clear = softpipe_clear;
    softpipe->pipe.flush = softpipe_flush;
-   softpipe->pipe.reset_occlusion_counter = softpipe_reset_occlusion_counter;
-   softpipe->pipe.get_occlusion_counter = softpipe_get_occlusion_counter;
+
+   softpipe->pipe.begin_query = softpipe_begin_query;
+   softpipe->pipe.end_query = softpipe_end_query;
+   softpipe->pipe.wait_query = softpipe_wait_query;
+
    softpipe->pipe.get_name = softpipe_get_name;
    softpipe->pipe.get_vendor = softpipe_get_vendor;
 
diff --git a/src/mesa/pipe/softpipe/sp_context.h b/src/mesa/pipe/softpipe/sp_context.h
index 2a6b932523..13d1143c89 100644
--- a/src/mesa/pipe/softpipe/sp_context.h
+++ b/src/mesa/pipe/softpipe/sp_context.h
@@ -94,6 +94,11 @@ struct softpipe_context {
    unsigned dirty;
 
    /*
+    * Active queries
+    */
+   struct pipe_query_object *queries[PIPE_QUERY_TYPES];
+
+   /*
     * Mapped vertex buffers
     */
    ubyte *mapped_vbuffer[PIPE_ATTRIB_MAX];
@@ -120,8 +125,6 @@ struct softpipe_context {
    /** Derived from scissor and surface bounds: */
    struct pipe_scissor_state cliprect;
 
-   unsigned occlusion_counter;
-
    unsigned line_stipple_counter;
 
    /** Software quad rendering pipeline */
diff --git a/src/mesa/pipe/softpipe/sp_quad_occlusion.c b/src/mesa/pipe/softpipe/sp_quad_occlusion.c
index 6b094a5bef..4f178f0557 100644
--- a/src/mesa/pipe/softpipe/sp_quad_occlusion.c
+++ b/src/mesa/pipe/softpipe/sp_quad_occlusion.c
@@ -44,11 +44,13 @@ static void
 occlusion_count_quad(struct quad_stage *qs, struct quad_header *quad)
 {
    struct softpipe_context *softpipe = qs->softpipe;
+   struct pipe_query_object *occ
+      = softpipe->queries[PIPE_QUERY_OCCLUSION_COUNTER];
 
-   softpipe->occlusion_counter += (quad->mask     ) & 1;
-   softpipe->occlusion_counter += (quad->mask >> 1) & 1;
-   softpipe->occlusion_counter += (quad->mask >> 2) & 1;
-   softpipe->occlusion_counter += (quad->mask >> 3) & 1;
+   occ->count += (quad->mask     ) & 1;
+   occ->count += (quad->mask >> 1) & 1;
+   occ->count += (quad->mask >> 2) & 1;
+   occ->count += (quad->mask >> 3) & 1;
 
    if (quad->mask)
       qs->next->run(qs->next, quad);