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gallivm: Don't use lp_build_sample_wrap_nearest() 

Always clamp with scaled coordinates.
This commit is contained in:
José Fonseca 2010-06-02 10:57:27 +01:00
parent 147dc2354c
commit e3d3f30440
1 changed files with 46 additions and 42 deletions
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88
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -708,7 +708,6 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
struct lp_build_context *coord_bld = &bld->coord_bld;
struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
LLVMValueRef two = lp_build_const_vec(coord_bld->type, 2.0);
LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
LLVMValueRef length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
LLVMValueRef length_f_minus_one = lp_build_sub(coord_bld, length_f, coord_bld->one);
@ -741,21 +740,17 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
{
LLVMValueRef min, max;
if (bld->static_state->normalized_coords) {
/* min = 1.0 / (2 * length) */
min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
/* max = length - min */
max = lp_build_sub(coord_bld, length_f, min);
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
}
else {
/* clamp to [0.5, length - 0.5] */
min = lp_build_const_vec(coord_bld->type, 0.5F);
max = lp_build_sub(coord_bld, length_f, min);
}
/* coord = clamp(coord, min, max) */
/* clamp to [0.5, length - 0.5] */
min = lp_build_const_vec(coord_bld->type, 0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
icoord = lp_build_ifloor(coord_bld, coord);
}
break;
@ -764,23 +759,17 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
/* Note: this is the same as CLAMP_TO_EDGE, except min = -min */
{
LLVMValueRef min, max;
if (bld->static_state->normalized_coords) {
/* min = -1.0 / (2 * length) = -0.5 / length */
min = lp_build_mul(coord_bld,
lp_build_const_vec(coord_bld->type, -0.5F),
lp_build_rcp(coord_bld, length_f));
/* max = length - min */
max = lp_build_sub(coord_bld, length_f, min);
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
}
else {
/* clamp to [-0.5, length + 0.5] */
min = lp_build_const_vec(coord_bld->type, -0.5F);
max = lp_build_sub(coord_bld, length_f, min);
}
/* coord = clamp(coord, min, max) */
/* clamp to [-0.5, length + 0.5] */
min = lp_build_const_vec(coord_bld->type, -0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
icoord = lp_build_ifloor(coord_bld, coord);
}
break;
@ -788,57 +777,72 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_MIRROR_REPEAT:
{
LLVMValueRef min, max;
/* min = 1.0 / (2 * length) */
min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
/* max = length - min */
max = lp_build_sub(coord_bld, length_f, min);
/* compute mirror function */
coord = lp_build_coord_mirror(bld, coord);
/* scale coord to length */
assert(bld->static_state->normalized_coords);
coord = lp_build_mul(coord_bld, coord, length_f);
/* coord = clamp(coord, min, max) */
/* clamp to [0.5, length - 0.5] */
min = lp_build_const_vec(coord_bld->type, 0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
icoord = lp_build_ifloor(coord_bld, coord);
}
break;
case PIPE_TEX_WRAP_MIRROR_CLAMP:
coord = lp_build_abs(coord_bld, coord);
/* scale coord to length */
assert(bld->static_state->normalized_coords);
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, length_f_minus_one);
/* clamp to [0, length - 1] */
coord = lp_build_min(coord_bld, coord, length_f_minus_one);
icoord = lp_build_ifloor(coord_bld, coord);
break;
case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
{
LLVMValueRef min, max;
/* min = 1.0 / (2 * length) */
min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
/* max = length - min */
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_abs(coord_bld, coord);
coord = lp_build_mul(coord_bld, coord, length_f);
if (bld->static_state->normalized_coords) {
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
}
/* clamp to [0.5, length - 0.5] */
min = lp_build_const_vec(coord_bld->type, 0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
icoord = lp_build_ifloor(coord_bld, coord);
}
break;
case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
{
LLVMValueRef min, max;
/* min = 1.0 / (2 * length) */
min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
min = lp_build_negate(coord_bld, min);
/* max = length - min */
max = lp_build_sub(coord_bld, length_f, min);
LLVMValueRef max;
coord = lp_build_abs(coord_bld, coord);
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_clamp(coord_bld, coord, min, max);
if (bld->static_state->normalized_coords) {
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
}
/* clamp to [-0.5, length + 0.5] */
max = lp_build_const_vec(coord_bld->type, 0.5F);
max = lp_build_add(coord_bld, length_f, max);
coord = lp_build_min(coord_bld, coord, max);
icoord = lp_build_ifloor(coord_bld, coord);
}
break;