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tgsi/lowering: add support for lowering TRUNC 

Add support for lowering TRUNC using the following sequence:

	FRC tmpA, |src|
	SUB tmpA, |src|, tmpA
	CMP dst, -tmpA, tmpA

Note that this is incompatible with FRC lowering.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Russell King 2016-04-13 18:42:40 -04:00 committed by Rob Clark
parent 23e870a888
commit 65460cf4c8
2 changed files with 85 additions and 0 deletions
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84
src/gallium/auxiliary/tgsi/tgsi_lowering.c
View File

@ -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;

1
src/gallium/auxiliary/tgsi/tgsi_lowering.h
View File

@ -70,6 +70,7 @@ struct tgsi_lowering_config
unsigned lower_DP2A:1;
unsigned lower_FLR:1;
unsigned lower_CEIL:1;
unsigned lower_TRUNC:1;
/* bitmask of (1 << TGSI_TEXTURE_type): */
unsigned lower_TXP;