i915: Use the current drawbuffer's depth for polygon offset scale.

There's no reason to care about the window system visual's depth for
handling polygon offset in an FBO, and it could only lead to pain.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i915/intel_tris.c b/src/mesa/drivers/dri/i915/intel_tris.c
index 7c60d8454fa86d967058878420f409b6e77c9f3b..126094b591b6117168a2e5a72214a3b16700a8a8 100644 (file)
--- a/src/mesa/drivers/dri/i915/intel_tris.c
+++ b/src/mesa/drivers/dri/i915/intel_tris.c
@@ -640,7 +640,7 @@ do {                                                        \
 } while (0)
 
 
-#define DEPTH_SCALE intel->polygon_offset_scale
+#define DEPTH_SCALE (ctx->DrawBuffer->Visual.depthBits == 16 ? 1.0 : 2.0)
 #define UNFILLED_TRI unfilled_tri
 #define UNFILLED_QUAD unfilled_quad
 #define VERT_X(_v) _v->v.x