From: Brian <brian@i915.localnet.net>
Date: Tue, 31 Jul 2007 17:15:30 +0000 (-0600)
Subject: fix stencil addressing bug
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6490c7d4aadac7d240d62e2d5c02d8973d69b71f;p=mesa.git

fix stencil addressing bug
---

diff --git a/src/mesa/drivers/dri/i915tex/intel_surface.c b/src/mesa/drivers/dri/i915tex/intel_surface.c
index 6b34d23ac9d..3e86835de25 100644
--- a/src/mesa/drivers/dri/i915tex/intel_surface.c
+++ b/src/mesa/drivers/dri/i915tex/intel_surface.c
@@ -95,8 +95,9 @@ read_quad_z24(struct softpipe_surface *sps,
    /* extract lower three bytes */
    zzzz[0] = src[0] & mask;
    zzzz[1] = src[1] & mask;
-   zzzz[2] = src[-sps->surface.stride] & mask;
-   zzzz[3] = src[-sps->surface.stride + 1] & mask;
+   src -= sps->surface.stride;
+   zzzz[2] = src[0] & mask;
+   zzzz[3] = src[1] & mask;
 }
 
 static void
@@ -133,8 +134,9 @@ read_quad_stencil(struct softpipe_surface *sps,
    /* extract high byte */
    ssss[0] = src[0] >> 24;
    ssss[1] = src[1] >> 24;
-   ssss[2] = src[-sps->surface.width] >> 24;
-   ssss[3] = src[-sps->surface.width + 1] >> 24;
+   src -= sps->surface.stride;
+   ssss[2] = src[0] >> 24;
+   ssss[3] = src[1] >> 24;
 }
 
 static void