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-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_arit.c13
-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_arit.h4
2 files changed, 17 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
index 42ae9f6a22..32f9e5201c 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
@@ -900,6 +900,19 @@ 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.
*/
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.h b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
index 866349d8cb..55385e3a66 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
@@ -149,6 +149,10 @@ 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);
LLVMValueRef