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gallivm: added lp_build_fract()

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This commit is contained in:
Brian Paul 2010-03-04 10:50:26 -07:00
parent 6464d81e77
commit 516bad2272
2 changed files with 17 additions and 0 deletions
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13
src/gallium/auxiliary/gallivm/lp_bld_arit.c
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@ -899,6 +899,19 @@ lp_build_ceil(struct lp_build_context *bld,
}
/**
* Return fractional part of 'a' computed as a - floor(f)
* Typically used in texture coord arithmetic.
*/
LLVMValueRef
lp_build_fract(struct lp_build_context *bld,
LLVMValueRef a)
{
assert(bld->type.floating);
return lp_build_sub(bld, a, lp_build_floor(bld, a));
}
/**
* Convert to integer, through whichever rounding method that's fastest,
* typically truncating toward zero.

4
src/gallium/auxiliary/gallivm/lp_bld_arit.h
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@ -148,6 +148,10 @@ LLVMValueRef
lp_build_trunc(struct lp_build_context *bld,
LLVMValueRef a);
LLVMValueRef
lp_build_fract(struct lp_build_context *bld,
LLVMValueRef a);
LLVMValueRef
lp_build_ifloor(struct lp_build_context *bld,
LLVMValueRef a);