Mesa (master): st/mesa: update query code for transform feedback

[Brian Paul]

Module: Mesa
Branch: master
Commit: 1e0afa695b56665ad89771589d728b2479a7b081
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1e0afa695b56665ad89771589d728b2479a7b081

Author: Brian Paul <brianp at vmware.com>
Date:   Tue May 11 21:04:43 2010 -0600

st/mesa: update query code for transform feedback

---

 src/mesa/state_tracker/st_cb_queryobj.c |   28 +++++++++++++++++++++++++---
 src/mesa/state_tracker/st_cb_queryobj.h |    1 +
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/src/mesa/state_tracker/st_cb_queryobj.c b/src/mesa/state_tracker/st_cb_queryobj.c
index 1896663..af60db8 100644
--- a/src/mesa/state_tracker/st_cb_queryobj.c
+++ b/src/mesa/state_tracker/st_cb_queryobj.c
@@ -51,6 +51,7 @@ st_NewQueryObject(GLcontext *ctx, GLuint id)
       stq->base.Id = id;
       stq->base.Ready = GL_TRUE;
       stq->pq = NULL;
+      stq->type = PIPE_QUERY_TYPES; /* an invalid value */
       return &stq->base;
    }
    return NULL;
@@ -78,17 +79,38 @@ st_BeginQuery(GLcontext *ctx, struct gl_query_object *q)
 {
    struct pipe_context *pipe = st_context(ctx)->pipe;
    struct st_query_object *stq = st_query_object(q);
+   unsigned type;
 
+   /* convert GL query type to Gallium query type */
    switch (q->Target) {
    case GL_SAMPLES_PASSED_ARB:
-      if (!stq->pq)
-	 stq->pq = pipe->create_query( pipe, PIPE_QUERY_OCCLUSION_COUNTER );
+      type = PIPE_QUERY_OCCLUSION_COUNTER;
+      break;
+   case GL_PRIMITIVES_GENERATED:
+      type = PIPE_QUERY_PRIMITIVES_GENERATED;
+      break;
+   case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
+      type = PIPE_QUERY_PRIMITIVES_EMITTED;
       break;
    default:
-      assert(0);
+      assert(0 && "unexpected query target in st_BeginQuery()");
       return;
    }
 
+   if (stq->pq && stq->type != type) {
+      /* free old query of different type */
+      pipe->destroy_query(pipe, stq->pq);
+      stq->pq = NULL;
+      stq->type = PIPE_QUERY_TYPES; /* an invalid value */
+   }
+
+   if (!stq->pq) {
+      stq->pq = pipe->create_query(pipe, type);
+      stq->type = type;
+   }
+
+   assert(stq->type == type);
+
    pipe->begin_query(pipe, stq->pq);
 }
 
diff --git a/src/mesa/state_tracker/st_cb_queryobj.h b/src/mesa/state_tracker/st_cb_queryobj.h
index fa256b7..b8b5781 100644
--- a/src/mesa/state_tracker/st_cb_queryobj.h
+++ b/src/mesa/state_tracker/st_cb_queryobj.h
@@ -36,6 +36,7 @@ struct st_query_object
 {
    struct gl_query_object base;
    struct pipe_query *pq;
+   unsigned type;  /**< PIPE_QUERY_x */
 };