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llvmpipe: Compute derivatives.

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This commit is contained in:
José Fonseca 2009-09-13 16:22:27 +01:00
parent 4b32dd3007
commit 86226d5ea1
1 changed files with 87 additions and 4 deletions
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91
src/gallium/drivers/llvmpipe/lp_bld_tgsi_soa.c
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@ -78,6 +78,11 @@
#define CHAN_Z 2
#define CHAN_W 3
#define QUAD_TOP_LEFT 0
#define QUAD_TOP_RIGHT 1
#define QUAD_BOTTOM_LEFT 2
#define QUAD_BOTTOM_RIGHT 3
struct lp_build_tgsi_soa_context
{
@ -97,6 +102,51 @@ struct lp_build_tgsi_soa_context
};
static const unsigned char
swizzle_left[4] = {
QUAD_TOP_LEFT, QUAD_TOP_LEFT,
QUAD_BOTTOM_LEFT, QUAD_BOTTOM_LEFT
};
static const unsigned char
swizzle_right[4] = {
QUAD_TOP_RIGHT, QUAD_TOP_RIGHT,
QUAD_BOTTOM_RIGHT, QUAD_BOTTOM_RIGHT
};
static const unsigned char
swizzle_top[4] = {
QUAD_TOP_LEFT, QUAD_TOP_RIGHT,
QUAD_TOP_LEFT, QUAD_TOP_RIGHT
};
static const unsigned char
swizzle_bottom[4] = {
QUAD_BOTTOM_LEFT, QUAD_BOTTOM_RIGHT,
QUAD_BOTTOM_LEFT, QUAD_BOTTOM_RIGHT
};
static LLVMValueRef
emit_ddx(struct lp_build_tgsi_soa_context *bld,
LLVMValueRef src)
{
LLVMValueRef src_left = lp_build_swizzle1_aos(&bld->base, src, swizzle_left);
LLVMValueRef src_right = lp_build_swizzle1_aos(&bld->base, src, swizzle_right);
return lp_build_sub(&bld->base, src_right, src_left);
}
static LLVMValueRef
emit_ddy(struct lp_build_tgsi_soa_context *bld,
LLVMValueRef src)
{
LLVMValueRef src_top = lp_build_swizzle1_aos(&bld->base, src, swizzle_top);
LLVMValueRef src_bottom = lp_build_swizzle1_aos(&bld->base, src, swizzle_bottom);
return lp_build_sub(&bld->base, src_top, src_bottom);
}
/**
* Register fetch.
*/
@ -184,6 +234,36 @@ emit_fetch(
}
/**
* Register fetch with derivatives.
*/
static void
emit_fetch_deriv(
struct lp_build_tgsi_soa_context *bld,
const struct tgsi_full_instruction *inst,
unsigned index,
const unsigned chan_index,
LLVMValueRef *res,
LLVMValueRef *ddx,
LLVMValueRef *ddy)
{
LLVMValueRef src;
src = emit_fetch(bld, inst, index, chan_index);
if(res)
*res = src;
/* TODO: use interpolation coeffs for inputs */
if(ddx)
*ddx = emit_ddx(bld, src);
if(ddy)
*ddy = emit_ddy(bld, src);
}
/**
* Register store.
*/
@ -239,6 +319,7 @@ emit_store(
* High-level instruction translators.
*/
static void
emit_tex( struct lp_build_tgsi_soa_context *bld,
const struct tgsi_full_instruction *inst,
@ -833,13 +914,15 @@ emit_instruction(
break;
case TGSI_OPCODE_DDX:
/* FIXME */
return 0;
FOR_EACH_DST0_ENABLED_CHANNEL( inst, chan_index ) {
emit_fetch_deriv( bld, inst, 0, chan_index, NULL, &dst0[chan_index], NULL);
}
break;
case TGSI_OPCODE_DDY:
/* FIXME */
return 0;
FOR_EACH_DST0_ENABLED_CHANNEL( inst, chan_index ) {
emit_fetch_deriv( bld, inst, 0, chan_index, NULL, NULL, &dst0[chan_index]);
}
break;
case TGSI_OPCODE_KILP: