Mesa (master): r300g: fix texturing with negative lod bias

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 392a2515c0967c395be098cac6a37f325dd66b90
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=392a2515c0967c395be098cac6a37f325dd66b90

Author: Marek Olšák <maraeo at gmail.com>
Date:   Fri Jul  9 00:16:49 2010 +0200

r300g: fix texturing with negative lod bias

This should fix FDO bugs #28437 and #28625.

---

 src/gallium/drivers/r300/r300_state.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index 4fbe8bf..b0722cb 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -1172,7 +1172,7 @@ static void*
 
     lod_bias = CLAMP((int)(state->lod_bias * 32 + 1), -(1 << 9), (1 << 9) - 1);
 
-    sampler->filter1 |= lod_bias << R300_LOD_BIAS_SHIFT;
+    sampler->filter1 |= (lod_bias << R300_LOD_BIAS_SHIFT) & R300_LOD_BIAS_MASK;
 
     /* This is very high quality anisotropic filtering for R5xx.
      * It's good for benchmarking the performance of texturing but