diff options
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi_lowering.c')
| -rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_lowering.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_lowering.c b/src/gallium/auxiliary/tgsi/tgsi_lowering.c index b2dd37e66c8..79599314591 100644 --- a/src/gallium/auxiliary/tgsi/tgsi_lowering.c +++ b/src/gallium/auxiliary/tgsi/tgsi_lowering.c @@ -1109,6 +1109,79 @@ transform_flr_ceil(struct tgsi_transform_context *tctx, } } +/* TRUNC - truncate off fractional part + * dst.x = trunc(src.x) + * dst.y = trunc(src.y) + * dst.z = trunc(src.z) + * dst.w = trunc(src.w) + * + * ; needs: 1 tmp + * if (lower FLR) { + * FRC tmpA, |src| + * SUB tmpA, |src|, tmpA + * } else { + * FLR tmpA, |src| + * } + * CMP dst, src, -tmpA, tmpA + */ +#define TRUNC_GROW (NINST(1) + NINST(2) + NINST(3) - OINST(1)) +#define TRUNC_TMP 1 +static void +transform_trunc(struct tgsi_transform_context *tctx, + struct tgsi_full_instruction *inst) +{ + struct tgsi_lowering_context *ctx = tgsi_lowering_context(tctx); + struct tgsi_full_dst_register *dst = &inst->Dst[0]; + struct tgsi_full_src_register *src0 = &inst->Src[0]; + struct tgsi_full_instruction new_inst; + + if (dst->Register.WriteMask & TGSI_WRITEMASK_XYZW) { + if (ctx->config->lower_FLR) { + new_inst = tgsi_default_full_instruction(); + new_inst.Instruction.Opcode = TGSI_OPCODE_FRC; + new_inst.Instruction.NumDstRegs = 1; + reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_XYZW); + new_inst.Instruction.NumSrcRegs = 1; + reg_src(&new_inst.Src[0], src0, SWIZ(X, Y, Z, W)); + new_inst.Src[0].Register.Absolute = true; + new_inst.Src[0].Register.Negate = false; + tctx->emit_instruction(tctx, &new_inst); + + new_inst = tgsi_default_full_instruction(); + new_inst.Instruction.Opcode = TGSI_OPCODE_SUB; + new_inst.Instruction.NumDstRegs = 1; + reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_XYZW); + new_inst.Instruction.NumSrcRegs = 2; + reg_src(&new_inst.Src[0], src0, SWIZ(X, Y, Z, W)); + new_inst.Src[0].Register.Absolute = true; + new_inst.Src[0].Register.Negate = false; + reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(X, Y, Z, W)); + tctx->emit_instruction(tctx, &new_inst); + } else { + new_inst = tgsi_default_full_instruction(); + new_inst.Instruction.Opcode = TGSI_OPCODE_FLR; + new_inst.Instruction.NumDstRegs = 1; + reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_XYZW); + new_inst.Instruction.NumSrcRegs = 1; + reg_src(&new_inst.Src[0], src0, SWIZ(X, Y, Z, W)); + new_inst.Src[0].Register.Absolute = true; + new_inst.Src[0].Register.Negate = false; + tctx->emit_instruction(tctx, &new_inst); + } + + new_inst = tgsi_default_full_instruction(); + new_inst.Instruction.Opcode = TGSI_OPCODE_CMP; + new_inst.Instruction.NumDstRegs = 1; + reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XYZW); + new_inst.Instruction.NumSrcRegs = 3; + reg_src(&new_inst.Src[0], src0, SWIZ(X, Y, Z, W)); + reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(X, Y, Z, W)); + new_inst.Src[1].Register.Negate = true; + reg_src(&new_inst.Src[2], &ctx->tmp[A].src, SWIZ(X, Y, Z, W)); + tctx->emit_instruction(tctx, &new_inst); + } +} + /* Inserts a MOV_SAT for the needed components of tex coord. Note that * in the case of TXP, the clamping must happen *after* projection, so * we need to lower TXP to TEX. @@ -1515,6 +1588,11 @@ transform_instr(struct tgsi_transform_context *tctx, goto skip; transform_flr_ceil(tctx, inst); break; + case TGSI_OPCODE_TRUNC: + if (!ctx->config->lower_TRUNC) + goto skip; + transform_trunc(tctx, inst); + break; case TGSI_OPCODE_TEX: case TGSI_OPCODE_TXP: case TGSI_OPCODE_TXB: @@ -1548,6 +1626,7 @@ tgsi_transform_lowering(const struct tgsi_lowering_config *config, /* sanity check the lowering */ assert(!(config->lower_FRC && (config->lower_FLR || config->lower_CEIL))); + assert(!(config->lower_FRC && config->lower_TRUNC)); memset(&ctx, 0, sizeof(ctx)); ctx.base.transform_instruction = transform_instr; @@ -1592,6 +1671,7 @@ tgsi_transform_lowering(const struct tgsi_lowering_config *config, OPCS(DP2A) || OPCS(FLR) || OPCS(CEIL) || + OPCS(TRUNC) || OPCS(TXP) || ctx.two_side_colors || ctx.saturate)) @@ -1668,6 +1748,10 @@ tgsi_transform_lowering(const struct tgsi_lowering_config *config, newlen += CEIL_GROW * OPCS(CEIL); numtmp = MAX2(numtmp, CEIL_TMP); } + if (OPCS(TRUNC)) { + newlen += TRUNC_GROW * OPCS(TRUNC); + numtmp = MAX2(numtmp, TRUNC_TMP); + } if (ctx.saturate || config->lower_TXP) { int n = 0; |