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authorJosé Fonseca <jfonseca@vmware.com>2009-09-07 14:27:06 +0100
committerJosé Fonseca <jfonseca@vmware.com>2009-09-07 15:02:07 +0100
commitfa0f4b35be17f68667edd6a2757b89086a11a833 (patch)
tree027e7608fc79baa80f3fded15e68119c539e8e04 /src/gallium/drivers/llvmpipe
parent4da20234f3ea9b1606522fd0a9f4ef5c4b903906 (diff)
llvmpipe: Utility functions for linear and bilinear interpolation.
Diffstat (limited to 'src/gallium/drivers/llvmpipe')
-rw-r--r--src/gallium/drivers/llvmpipe/lp_bld_arit.c25
-rw-r--r--src/gallium/drivers/llvmpipe/lp_bld_arit.h20
2 files changed, 45 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_arit.c b/src/gallium/drivers/llvmpipe/lp_bld_arit.c
index eb9e579bdd..a1d8a89774 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_arit.c
+++ b/src/gallium/drivers/llvmpipe/lp_bld_arit.c
@@ -502,6 +502,31 @@ lp_build_div(struct lp_build_context *bld,
}
+LLVMValueRef
+lp_build_lerp(struct lp_build_context *bld,
+ LLVMValueRef x,
+ LLVMValueRef v0,
+ LLVMValueRef v1)
+{
+ return lp_build_add(bld, v0, lp_build_mul(bld, x, lp_build_sub(bld, v1, v0)));
+}
+
+
+LLVMValueRef
+lp_build_lerp_2d(struct lp_build_context *bld,
+ LLVMValueRef x,
+ LLVMValueRef y,
+ LLVMValueRef v00,
+ LLVMValueRef v01,
+ LLVMValueRef v10,
+ LLVMValueRef v11)
+{
+ LLVMValueRef v0 = lp_build_lerp(bld, x, v00, v01);
+ LLVMValueRef v1 = lp_build_lerp(bld, x, v10, v11);
+ return lp_build_lerp(bld, y, v0, v1);
+}
+
+
/**
* Generate min(a, b)
* Do checks for special cases.
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_arit.h b/src/gallium/drivers/llvmpipe/lp_bld_arit.h
index 0732b9fa75..383c3c3313 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_arit.h
+++ b/src/gallium/drivers/llvmpipe/lp_bld_arit.h
@@ -72,6 +72,26 @@ lp_build_div(struct lp_build_context *bld,
LLVMValueRef b);
LLVMValueRef
+lp_build_lerp(struct lp_build_context *bld,
+ LLVMValueRef x,
+ LLVMValueRef v0,
+ LLVMValueRef v1);
+
+/**
+ * Bilinear interpolation.
+ *
+ * Values indices are in v_{yx}.
+ */
+LLVMValueRef
+lp_build_lerp_2d(struct lp_build_context *bld,
+ LLVMValueRef x,
+ LLVMValueRef y,
+ LLVMValueRef v00,
+ LLVMValueRef v01,
+ LLVMValueRef v10,
+ LLVMValueRef v11);
+
+LLVMValueRef
lp_build_min(struct lp_build_context *bld,
LLVMValueRef a,
LLVMValueRef b);