Mesa (master): llvmpipe: Utility functions for linear and bilinear interpolation.
Jose Fonseca
jrfonseca at kemper.freedesktop.org
Mon Sep 7 14:09:41 UTC 2009
Module: Mesa
Branch: master
Commit: fa0f4b35be17f68667edd6a2757b89086a11a833
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=fa0f4b35be17f68667edd6a2757b89086a11a833
Author: José Fonseca <jfonseca at vmware.com>
Date: Mon Sep 7 14:27:06 2009 +0100
llvmpipe: Utility functions for linear and bilinear interpolation.
---
src/gallium/drivers/llvmpipe/lp_bld_arit.c | 25 +++++++++++++++++++++++++
src/gallium/drivers/llvmpipe/lp_bld_arit.h | 20 ++++++++++++++++++++
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 eb9e579..a1d8a89 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 0732b9f..383c3c3 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);
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