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-rw-r--r--src/mesa/drivers/dri/i915/i830_reg.h2
-rw-r--r--src/mesa/drivers/dri/i915/i915_reg.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/i915/i830_reg.h b/src/mesa/drivers/dri/i915/i830_reg.h
index c45b88ca52..98cee2f214 100644
--- a/src/mesa/drivers/dri/i915/i830_reg.h
+++ b/src/mesa/drivers/dri/i915/i830_reg.h
@@ -410,7 +410,7 @@
#define STENCIL_TEST_MASK(x) ((x)<<8)
#define MODE4_ENABLE_STENCIL_WRITE_MASK ((1<<16)|(0x00ff))
#define ENABLE_STENCIL_WRITE_MASK (1<<16)
-#define STENCIL_WRITE_MASK(x) (x)
+#define STENCIL_WRITE_MASK(x) ((x)&0xff)
/* _3DSTATE_MODES_5, p196 */
#define _3DSTATE_MODES_5_CMD (CMD_3D|(0x0c<<24))
diff --git a/src/mesa/drivers/dri/i915/i915_reg.h b/src/mesa/drivers/dri/i915/i915_reg.h
index e95d76c78f..3ba792a234 100644
--- a/src/mesa/drivers/dri/i915/i915_reg.h
+++ b/src/mesa/drivers/dri/i915/i915_reg.h
@@ -438,7 +438,7 @@
#define STENCIL_TEST_MASK(x) ((x)<<8)
#define MODE4_ENABLE_STENCIL_WRITE_MASK ((1<<16)|(0x00ff))
#define ENABLE_STENCIL_WRITE_MASK (1<<16)
-#define STENCIL_WRITE_MASK(x) (x)
+#define STENCIL_WRITE_MASK(x) ((x)&0xff)
/* _3DSTATE_MODES_5, p220 */
#define _3DSTATE_MODES_5_CMD (CMD_3D|(0x0c<<24))