Mesa (master): i965/fs_surface_builder: Mask signed integers after conversion

[Jason Ekstrand]

Module: Mesa
Branch: master
Commit: 144839ab9e76ed740b4548635360311a9c6d2b21
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=144839ab9e76ed740b4548635360311a9c6d2b21

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Mon Jan 18 17:30:59 2016 -0800

i965/fs_surface_builder: Mask signed integers after conversion

Reviewed-by: Francisco Jerez <currojerez at riseup.net>
Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>

---

 src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp
index 75734d2..96731ff 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp
@@ -717,6 +717,15 @@ namespace {
                   bld.emit_minmax(offset(dst, bld, c), offset(dst, bld, c),
                                   brw_imm_d(-(int)scale(widths[c] - s) - 1),
                                   BRW_CONDITIONAL_GE);
+
+               /* Mask off all but the bits we actually want.  Otherwise, if
+                * we pass a negative number into the hardware when it's
+                * expecting something like UINT8, it will happily clamp it to
+                * +255 for us.
+                */
+               if (is_signed && widths[c] < 32)
+                  bld.AND(offset(dst, bld, c), offset(dst, bld, c),
+                          brw_imm_d(scale(widths[c])));
             }
          }
 
@@ -787,6 +796,15 @@ namespace {
                /* Convert to integer. */
                bld.RNDE(offset(fdst, bld, c), offset(fdst, bld, c));
                bld.MOV(offset(dst, bld, c), offset(fdst, bld, c));
+
+               /* Mask off all but the bits we actually want.  Otherwise, if
+                * we pass a negative number into the hardware when it's
+                * expecting something like UINT8, it will happily clamp it to
+                * +255 for us.
+                */
+               if (is_signed && widths[c] < 32)
+                  bld.AND(offset(dst, bld, c), offset(dst, bld, c),
+                          brw_imm_d(scale(widths[c])));
             }
          }