panfrost: Count draws at the batch level

This way we have a HW-agnostic way to know how many draws were issued,
instead of looking into the job chain builder guts.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26249>

src/gallium/drivers/panfrost/pan_cmdstream.c

@@ -3700,6 +3700,7 @@ panfrost_direct_draw(struct panfrost_batch *batch,
       panfrost_emit_vertex_tiler_jobs(batch, &vertex, &tiler);
    }
 #endif
+   batch->draw_count++;
 }
 
 static bool

src/gallium/drivers/panfrost/pan_job.h

@@ -189,6 +189,12 @@ struct panfrost_batch {
     */
    struct pan_tristate sprite_coord_origin;
    struct pan_tristate first_provoking_vertex;
+
+   /* Number of effective draws in the batch. Draws with rasterization disabled
+    * don't count as effective draws. It's basically the number of IDVS or
+    * <vertex,tiler> jobs present in the batch.
+    */
+   uint32_t draw_count;
 };
 
 /* Functions for managing the above */