Mesa (master): i965: Emit a performance warning on conditional rendering.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: ae95b9dd9be56ad84a8a4ab5955f580c337259cb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ae95b9dd9be56ad84a8a4ab5955f580c337259cb

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sun Aug  3 23:54:22 2014 -0700

i965: Emit a performance warning on conditional rendering.

We have a CPU-side implementation of conditional rendering; it really
should be done on the GPU.  It's not necessarily that hard, but nobody
has gotten to fixing it yet.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Chris Forbes <chrisf at ijw.co.nz>

---

 src/mesa/drivers/dri/i965/brw_draw.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_draw.c b/src/mesa/drivers/dri/i965/brw_draw.c
index 4dae7d3..412c360 100644
--- a/src/mesa/drivers/dri/i965/brw_draw.c
+++ b/src/mesa/drivers/dri/i965/brw_draw.c
@@ -539,6 +539,11 @@ void brw_draw_prims( struct gl_context *ctx,
 
    assert(unused_tfb_object == NULL);
 
+   if (ctx->Query.CondRenderQuery) {
+      perf_debug("Conditional rendering is implemented in software and may "
+                 "stall.  This should be fixed in the driver.\n");
+   }
+
    if (!_mesa_check_conditional_render(ctx))
       return;