diff options
Diffstat (limited to 'src/gallium/drivers/r300/compiler/radeon_program_alu.c')
| -rw-r--r-- | src/gallium/drivers/r300/compiler/radeon_program_alu.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/gallium/drivers/r300/compiler/radeon_program_alu.c b/src/gallium/drivers/r300/compiler/radeon_program_alu.c index f4ee86de5d0..4dc4250699e 100644 --- a/src/gallium/drivers/r300/compiler/radeon_program_alu.c +++ b/src/gallium/drivers/r300/compiler/radeon_program_alu.c @@ -1283,3 +1283,31 @@ void rc_transform_KILP(struct radeon_compiler * c, void *user) } } } + +int rc_force_output_alpha_to_one(struct radeon_compiler *c, + struct rc_instruction *inst, void *data) +{ + struct r300_fragment_program_compiler *fragc = (struct r300_fragment_program_compiler*)c; + const struct rc_opcode_info *info = rc_get_opcode_info(inst->U.I.Opcode); + unsigned tmp; + + if (!info->HasDstReg || inst->U.I.DstReg.File != RC_FILE_OUTPUT || + inst->U.I.DstReg.Index == fragc->OutputDepth) + return 1; + + tmp = rc_find_free_temporary(c); + + /* Insert MOV after inst, set alpha to 1. */ + emit1(c, inst, RC_OPCODE_MOV, 0, inst->U.I.DstReg, + srcregswz(RC_FILE_TEMPORARY, tmp, RC_SWIZZLE_XYZ1)); + + /* Re-route the destination of inst to the source of mov. */ + inst->U.I.DstReg.File = RC_FILE_TEMPORARY; + inst->U.I.DstReg.Index = tmp; + + /* Move the saturate output modifier to the MOV instruction + * (for better copy propagation). */ + inst->Next->U.I.SaturateMode = inst->U.I.SaturateMode; + inst->U.I.SaturateMode = RC_SATURATE_NONE; + return 1; +} |