diff options
author | José Fonseca <jfonseca@vmware.com> | 2010-06-01 16:27:36 +0100 |
---|---|---|
committer | José Fonseca <jfonseca@vmware.com> | 2010-06-01 16:39:03 +0100 |
commit | abe4f3d1aa68aec70d329447abc890b3eaaba9cb (patch) | |
tree | 6dd3c252a7abea638458494bba6417e7d8fe512a /src/gallium/auxiliary/tgsi/tgsi_util.c | |
parent | d9c6ebb4fec0059734d94767ea7fe99c848693a5 (diff) |
tgsi: Determine which shader input channels are effectively.
TGSI's UsageMask flag is never set. We can move this logic into
tgsi_ureg, but there there are still cases where's not used, so this
seems a better place for now.
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi_util.c')
-rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_util.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_util.c b/src/gallium/auxiliary/tgsi/tgsi_util.c index 0a7e4105a8..3ec5496416 100644 --- a/src/gallium/auxiliary/tgsi/tgsi_util.c +++ b/src/gallium/auxiliary/tgsi/tgsi_util.c @@ -163,3 +163,149 @@ tgsi_util_set_full_src_register_sign_mode( assert( 0 ); } } + +/** + * Determine which channels of the specificed src register are effectively + * used by this instruction. + */ +unsigned +tgsi_util_get_inst_usage_mask(const struct tgsi_full_instruction *inst, + unsigned src_idx) +{ + const struct tgsi_full_src_register *src = &inst->Src[src_idx]; + unsigned write_mask = inst->Dst[0].Register.WriteMask; + unsigned read_mask; + unsigned usage_mask; + unsigned chan; + + switch (inst->Instruction.Opcode) { + case TGSI_OPCODE_MOV: + case TGSI_OPCODE_ARL: + case TGSI_OPCODE_ARR: + case TGSI_OPCODE_RCP: + case TGSI_OPCODE_MUL: + case TGSI_OPCODE_DIV: + case TGSI_OPCODE_ADD: + case TGSI_OPCODE_MIN: + case TGSI_OPCODE_MAX: + case TGSI_OPCODE_SLT: + case TGSI_OPCODE_SGE: + case TGSI_OPCODE_MAD: + case TGSI_OPCODE_SUB: + case TGSI_OPCODE_LRP: + case TGSI_OPCODE_CND: + case TGSI_OPCODE_FRC: + case TGSI_OPCODE_CEIL: + case TGSI_OPCODE_CLAMP: + case TGSI_OPCODE_FLR: + case TGSI_OPCODE_ROUND: + case TGSI_OPCODE_POW: + case TGSI_OPCODE_ABS: + case TGSI_OPCODE_COS: + case TGSI_OPCODE_SIN: + case TGSI_OPCODE_DDX: + case TGSI_OPCODE_DDY: + case TGSI_OPCODE_SEQ: + case TGSI_OPCODE_SGT: + case TGSI_OPCODE_SLE: + case TGSI_OPCODE_SNE: + case TGSI_OPCODE_SSG: + case TGSI_OPCODE_CMP: + case TGSI_OPCODE_TRUNC: + case TGSI_OPCODE_NOT: + case TGSI_OPCODE_AND: + case TGSI_OPCODE_OR: + case TGSI_OPCODE_XOR: + case TGSI_OPCODE_SAD: + /* Channel-wise operations */ + read_mask = write_mask; + break; + + case TGSI_OPCODE_EX2: + case TGSI_OPCODE_LG2: + case TGSI_OPCODE_RCC: + read_mask = TGSI_WRITEMASK_X; + break; + + case TGSI_OPCODE_SCS: + read_mask = write_mask & TGSI_WRITEMASK_XY ? TGSI_WRITEMASK_X : 0; + break; + + case TGSI_OPCODE_EXP: + case TGSI_OPCODE_LOG: + read_mask = write_mask & TGSI_WRITEMASK_XYZ ? TGSI_WRITEMASK_X : 0; + break; + + case TGSI_OPCODE_DP2A: + read_mask = src_idx == 2 ? TGSI_WRITEMASK_X : TGSI_WRITEMASK_XY; + break; + + case TGSI_OPCODE_DP2: + read_mask = TGSI_WRITEMASK_XY; + break; + + case TGSI_OPCODE_DP3: + read_mask = TGSI_WRITEMASK_XYZ; + break; + + case TGSI_OPCODE_DP4: + read_mask = TGSI_WRITEMASK_XYZW; + break; + + case TGSI_OPCODE_DPH: + read_mask = src_idx == 0 ? TGSI_WRITEMASK_XYZ : TGSI_WRITEMASK_XYZW; + break; + + case TGSI_OPCODE_TEX: + case TGSI_OPCODE_TXD: + case TGSI_OPCODE_TXB: + case TGSI_OPCODE_TXL: + case TGSI_OPCODE_TXP: + if (src_idx == 0) { + switch (inst->Texture.Texture) { + case TGSI_TEXTURE_1D: + case TGSI_TEXTURE_SHADOW1D: + read_mask = TGSI_WRITEMASK_X; + break; + + case TGSI_TEXTURE_2D: + case TGSI_TEXTURE_RECT: + case TGSI_TEXTURE_SHADOW2D: + case TGSI_TEXTURE_SHADOWRECT: + read_mask = TGSI_WRITEMASK_XY; + break; + + case TGSI_TEXTURE_3D: + case TGSI_TEXTURE_CUBE: + read_mask = TGSI_WRITEMASK_XYZ; + break; + + default: + assert(0); + read_mask = 0; + } + + if (inst->Instruction.Opcode != TGSI_OPCODE_TEX) { + read_mask |= TGSI_WRITEMASK_W; + } + } else { + /* A safe approximation */ + read_mask = TGSI_WRITEMASK_XYZW; + } + break; + + default: + /* Assume all channels are read */ + read_mask = TGSI_WRITEMASK_XYZW; + break; + } + + usage_mask = 0; + for (chan = 0; chan < 4; ++chan) { + if (read_mask & (1 << chan)) { + usage_mask |= 1 << tgsi_util_get_full_src_register_swizzle(src, chan); + } + } + + return usage_mask; +} |