Mesa (master): i965: Add a warning if something ever hits a bug I noticed.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 8bd45a7e7ed8be3f5bb13689d249fc886cf73067
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8bd45a7e7ed8be3f5bb13689d249fc886cf73067

Author: Eric Anholt <eric at anholt.net>
Date:   Thu Oct 31 10:14:17 2013 -0700

i965: Add a warning if something ever hits a bug I noticed.

We'd have to map the VBO and rewrite things to a lower stride to fix it.

Reviewed-by: Matt Turner <mattst88 at gmail.com>

---

 src/mesa/drivers/dri/i965/brw_draw_upload.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_draw_upload.c b/src/mesa/drivers/dri/i965/brw_draw_upload.c
index e2002e8..57b81df 100644
--- a/src/mesa/drivers/dri/i965/brw_draw_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_draw_upload.c
@@ -609,6 +609,7 @@ static void brw_prepare_vertices(struct brw_context *brw)
 
 static void brw_emit_vertices(struct brw_context *brw)
 {
+   struct gl_context *ctx = &brw->ctx;
    GLuint i, nr_elements;
 
    brw_prepare_vertices(brw);
@@ -680,6 +681,9 @@ static void brw_emit_vertices(struct brw_context *brw)
          if (brw->gen == 7)
 	    dw0 |= GEN7_MOCS_L3 << 16;
 
+         WARN_ONCE(buffer->stride >= (brw->gen >= 5 ? 2048 : 2047),
+                   "VBO stride %d too large, bad rendering may occur\n",
+                   buffer->stride);
 	 OUT_BATCH(dw0 | (buffer->stride << BRW_VB0_PITCH_SHIFT));
 	 OUT_RELOC(buffer->bo, I915_GEM_DOMAIN_VERTEX, 0, buffer->offset);
 	 if (brw->gen >= 5) {