The value that's split into width/height/depth needs to be the size of
the buffer minus one.  This makes it consistent with the constant buffer
and shader time SURFACE_STATE setup code.

Signed-off-by: Kenneth Graunke <[email protected]>
Cc: Paul Berry <[email protected]>
Cc: Eric Anholt <[email protected]>
---
 src/mesa/drivers/dri/i965/brw_wm_surface_state.c  | 2 +-
 src/mesa/drivers/dri/i965/gen7_wm_surface_state.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c 
b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 8d87786..0078161 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -228,7 +228,7 @@ brw_update_buffer_texture_surface(struct gl_context *ctx,
                              *surf_offset + 4,
                              bo, 0, I915_GEM_DOMAIN_SAMPLER, 0);
 
-      int w = intel_obj->Base.Size / texel_size;
+      int w = (intel_obj->Base.Size / texel_size) - 1;
       surf[2] = ((w & 0x7f) << BRW_SURFACE_WIDTH_SHIFT |
                 ((w >> 7) & 0x1fff) << BRW_SURFACE_HEIGHT_SHIFT);
       surf[3] = (((w >> 20) & 0x7f) << BRW_SURFACE_DEPTH_SHIFT |
diff --git a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c 
b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
index 37e3174..c38843f 100644
--- a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
@@ -260,7 +260,7 @@ gen7_update_buffer_texture_surface(struct gl_context *ctx,
                              I915_GEM_DOMAIN_SAMPLER, 0);
 
       int texel_size = _mesa_get_format_bytes(format);
-      int w = intel_obj->Base.Size / texel_size;
+      int w = (intel_obj->Base.Size / texel_size) - 1;
 
       /* note that these differ from GEN6 */
       surf[2] = SET_FIELD(w & 0x7f, GEN7_SURFACE_WIDTH) | /* bits 6:0 of size 
*/
-- 
1.8.3.4

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