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freedreno/a3xx/compiler: handle saturate on dst

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Sometimes things other than color dst need saturating, like if there is
a 'clamp(foo, 0.0, 1.0)'.  So for saturated dst add the extra
instructions to fix up dst.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Rob Clark 2013-08-20 13:51:35 -04:00
parent 83e6532001
commit c833874386
1 changed files with 49 additions and 0 deletions
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49
src/gallium/drivers/freedreno/a3xx/fd3_compiler.c
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@ -131,6 +131,11 @@ struct fd3_compile_context {
struct tgsi_src_register tmp_src;
};
static void vectorize(struct fd3_compile_context *ctx,
struct ir3_instruction *instr, struct tgsi_dst_register *dst,
int nsrcs, ...);
static unsigned
compile_init(struct fd3_compile_context *ctx, struct fd3_shader_stateobj *so,
const struct tgsi_token *tokens)
@ -234,6 +239,10 @@ add_src_reg(struct fd3_compile_context *ctx, struct ir3_instruction *instr,
flags |= IR3_REG_CONST;
num = src->Index + ctx->base_reg[src->File];
break;
case TGSI_FILE_OUTPUT:
/* NOTE: we should only end up w/ OUTPUT file for things like
* clamp()'ing saturated dst instructions
*/
case TGSI_FILE_INPUT:
case TGSI_FILE_TEMPORARY:
num = src->Index + ctx->base_reg[src->File];
@ -407,6 +416,35 @@ create_mov(struct fd3_compile_context *ctx, struct tgsi_dst_register *dst,
}
static void
create_clamp(struct fd3_compile_context *ctx, struct tgsi_dst_register *dst,
struct tgsi_src_register *minval, struct tgsi_src_register *maxval)
{
struct ir3_instruction *instr;
struct tgsi_src_register src;
src_from_dst(&src, dst);
instr = ir3_instr_create(ctx->ir, 2, OPC_MAX_F);
vectorize(ctx, instr, dst, 2, &src, 0, minval, 0);
instr = ir3_instr_create(ctx->ir, 2, OPC_MIN_F);
vectorize(ctx, instr, dst, 2, &src, 0, maxval, 0);
}
static void
create_clamp_imm(struct fd3_compile_context *ctx,
struct tgsi_dst_register *dst,
uint32_t minval, uint32_t maxval)
{
struct tgsi_src_register minconst, maxconst;
get_immediate(ctx, &minconst, minval);
get_immediate(ctx, &maxconst, maxval);
create_clamp(ctx, dst, &minconst, &maxconst);
}
static struct tgsi_dst_register *
get_dst(struct fd3_compile_context *ctx, struct tgsi_full_instruction *inst)
{
@ -1229,6 +1267,17 @@ compile_instructions(struct fd3_compile_context *ctx)
assert(0);
}
switch (inst->Instruction.Saturate) {
case TGSI_SAT_ZERO_ONE:
create_clamp_imm(ctx, &inst->Dst[0].Register,
fui(0.0), fui(1.0));
break;
case TGSI_SAT_MINUS_PLUS_ONE:
create_clamp_imm(ctx, &inst->Dst[0].Register,
fui(-1.0), fui(1.0));
break;
}
break;
}
default: