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gallivm: implement non-normalized texture wrap modes 

Note that only the PIPE_TEX_WRAP_CLAMP,CLAMP_TO_EDGE,CLAMP_TO_BORDER
modes work with non-normalized texcoords.
This commit is contained in:
Brian Paul 2010-03-05 13:21:56 -07:00
parent b5b128b268
commit d660e28c9c
1 changed files with 68 additions and 39 deletions
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107
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -361,15 +361,10 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
LLVMValueRef two = lp_build_const_scalar(coord_bld->type, 2.0);
LLVMValueRef half = lp_build_const_scalar(coord_bld->type, 0.5);
LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
LLVMValueRef length_minus_one;
LLVMValueRef length_f_minus_one;
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);
LLVMValueRef coord0, coord1, weight;
/* XXX check for normalized vs. unnormalized coords */
length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
length_f_minus_one = lp_build_sub(coord_bld, length_f, coord_bld->one);
switch(wrap_mode) {
case PIPE_TEX_WRAP_REPEAT:
/* mul by size and subtract 0.5 */
@ -394,7 +389,9 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
break;
case PIPE_TEX_WRAP_CLAMP:
coord = lp_build_mul(coord_bld, coord, length_f);
if (bld->static_state->normalized_coords) {
coord = lp_build_mul(coord_bld, coord, length_f);
}
weight = lp_build_fract(coord_bld, coord);
coord0 = lp_build_clamp(coord_bld, coord, coord_bld->zero,
length_f_minus_one);
@ -406,11 +403,20 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
break;
case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
/* clamp to [0,1] */
coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, coord_bld->one);
/* mul by tex size and subtract 0.5 */
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
if (bld->static_state->normalized_coords) {
/* clamp to [0,1] */
coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, coord_bld->one);
/* mul by tex size and subtract 0.5 */
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
}
else {
LLVMValueRef min, max;
/* clamp to [0.5, length - 0.5] */
min = lp_build_const_scalar(coord_bld->type, 0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
}
/* compute lerp weight */
weight = lp_build_fract(coord_bld, coord);
/* coord0 = floor(coord); */
@ -425,16 +431,25 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_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 = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
/* coord = clamp(coord, min, max) */
coord = lp_build_clamp(coord_bld, coord, min, max);
/* scale coord to length (and sub 0.5?) */
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
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));
min = lp_build_negate(coord_bld, min);
/* max = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
/* coord = clamp(coord, min, max) */
coord = lp_build_clamp(coord_bld, coord, min, max);
/* scale coord to length (and sub 0.5?) */
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
}
else {
/* clamp to [-0.5, length + 0.5] */
min = lp_build_const_scalar(coord_bld->type, -0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
coord = lp_build_sub(coord_bld, coord, half);
}
/* compute lerp weight */
weight = lp_build_fract(coord_bld, coord);
/* convert to int */
@ -552,8 +567,6 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
LLVMValueRef length_f_minus_one = lp_build_sub(coord_bld, length_f, coord_bld->one);
LLVMValueRef icoord;
/* XXX check for normalized vs. unnormalized coords */
switch(wrap_mode) {
case PIPE_TEX_WRAP_REPEAT:
coord = lp_build_mul(coord_bld, coord, length_f);
@ -568,7 +581,9 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_CLAMP:
/* mul by size */
coord = lp_build_mul(coord_bld, coord, length_f);
if (bld->static_state->normalized_coords) {
coord = lp_build_mul(coord_bld, coord, length_f);
}
/* floor */
icoord = lp_build_ifloor(coord_bld, coord);
/* clamp to [0, size-1]. Note: int coord builder type */
@ -579,12 +594,19 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_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);
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
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_scalar(coord_bld->type, 0.5F);
max = lp_build_sub(coord_bld, length_f, min);
}
/* coord = clamp(coord, min, max) */
coord = lp_build_clamp(coord_bld, coord, min, max);
icoord = lp_build_ifloor(coord_bld, coord);
@ -595,13 +617,20 @@ 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;
/* 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);
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
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));
min = lp_build_negate(coord_bld, min);
/* 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_scalar(coord_bld->type, -0.5F);
max = lp_build_sub(coord_bld, length_f, min);
}
/* coord = clamp(coord, min, max) */
coord = lp_build_clamp(coord_bld, coord, min, max);
icoord = lp_build_ifloor(coord_bld, coord);