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gallivm: minor arithmetic improvements

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This commit is contained in:
Brian Paul 2010-03-05 13:27:51 -07:00
parent d660e28c9c
commit 88e2eae271
1 changed files with 12 additions and 9 deletions
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21
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -432,9 +432,10 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
{
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));
min = lp_build_negate(coord_bld, min);
/* min = -1.0 / (2 * length) = -0.5 / length */
min = lp_build_mul(coord_bld,
lp_build_const_scalar(coord_bld->type, -0.5F),
lp_build_rcp(coord_bld, length_f));
/* max = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
/* coord = clamp(coord, min, max) */
@ -518,9 +519,10 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
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);
/* min = -1.0 / (2 * length) = -0.5 / length */
min = lp_build_mul(coord_bld,
lp_build_const_scalar(coord_bld->type, -0.5F),
lp_build_rcp(coord_bld, length_f));
/* max = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
@ -618,9 +620,10 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
{
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));
min = lp_build_negate(coord_bld, min);
/* min = -1.0 / (2 * length) = -0.5 / length */
min = lp_build_mul(coord_bld,
lp_build_const_scalar(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 */