diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_defines.h')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_defines.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h index a5f3b52..51eb856 100644 --- a/src/mesa/drivers/dri/i965/brw_defines.h +++ b/src/mesa/drivers/dri/i965/brw_defines.h @@ -1082,6 +1082,12 @@ enum opcode { /** * Pick the channel from its first source register given by the index * specified as second source. Useful for variable indexing of surfaces. + * + * Note that because the result of this instruction is by definition + * uniform and it can always be splatted to multiple channels using a + * scalar regioning mode, only the first channel of the destination region + * is guaranteed to be updated, which implies that BROADCAST instructions + * should usually be marked force_writemask_all. */ SHADER_OPCODE_BROADCAST, |