diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp | 18 |
1 files changed, 18 insertions, 0 deletions
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 75734d2cfa0..96731ffac7f 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]))); } } |