From: Brian Paul <brianp@vmware.com>
Date: Thu, 4 Mar 2010 17:50:26 +0000 (-0700)
Subject: gallivm: added lp_build_fract()
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=516bad2272aa9bb3c85516e0023ddd2ed236dcef;p=mesa.git

gallivm: added lp_build_fract()
---

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
index 42ae9f6a22c..32f9e5201c5 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
@@ -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.
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.h b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
index 866349d8cba..55385e3a66a 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
@@ -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);