From ef81779850d1343b3ae284eb9beabeaf11934d4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Fonseca?= <jfonseca@vmware.com>
Date: Thu, 3 Jun 2010 14:16:59 +0100
Subject: gallivm: Factor out the quad derivative code into a single place. Fix
 ddy.

For ddy it should be (bottom - top).
---
 src/gallium/auxiliary/gallivm/lp_bld_quad.c | 101 ++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 src/gallium/auxiliary/gallivm/lp_bld_quad.c

(limited to 'src/gallium/auxiliary/gallivm/lp_bld_quad.c')

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_quad.c b/src/gallium/auxiliary/gallivm/lp_bld_quad.c
new file mode 100644
index 0000000..38fd5a3
--- /dev/null
+++ b/src/gallium/auxiliary/gallivm/lp_bld_quad.c
@@ -0,0 +1,101 @@
+/**************************************************************************
+ *
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ **************************************************************************/
+
+
+#include "lp_bld_type.h"
+#include "lp_bld_arit.h"
+#include "lp_bld_swizzle.h"
+#include "lp_bld_quad.h"
+
+
+static const unsigned char
+swizzle_left[4] = {
+   LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_LEFT,
+   LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_LEFT
+};
+
+static const unsigned char
+swizzle_right[4] = {
+   LP_BLD_QUAD_TOP_RIGHT,    LP_BLD_QUAD_TOP_RIGHT,
+   LP_BLD_QUAD_BOTTOM_RIGHT, LP_BLD_QUAD_BOTTOM_RIGHT
+};
+
+static const unsigned char
+swizzle_top[4] = {
+   LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT,
+   LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT
+};
+
+static const unsigned char
+swizzle_bottom[4] = {
+   LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT,
+   LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT
+};
+
+
+LLVMValueRef
+lp_build_ddx(struct lp_build_context *bld,
+             LLVMValueRef a)
+{
+   LLVMValueRef a_left  = lp_build_swizzle1_aos(bld, a, swizzle_left);
+   LLVMValueRef a_right = lp_build_swizzle1_aos(bld, a, swizzle_right);
+   return lp_build_sub(bld, a_right, a_left);
+}
+
+
+LLVMValueRef
+lp_build_ddy(struct lp_build_context *bld,
+             LLVMValueRef a)
+{
+   LLVMValueRef a_top    = lp_build_swizzle1_aos(bld, a, swizzle_top);
+   LLVMValueRef a_bottom = lp_build_swizzle1_aos(bld, a, swizzle_bottom);
+   return lp_build_sub(bld, a_bottom, a_top);
+}
+
+
+LLVMValueRef
+lp_build_scalar_ddx(struct lp_build_context *bld,
+                    LLVMValueRef a)
+{
+   LLVMValueRef idx_left  = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_TOP_LEFT, 0);
+   LLVMValueRef idx_right = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_TOP_RIGHT, 0);
+   LLVMValueRef a_left  = LLVMBuildExtractElement(bld->builder, a, idx_left, "");
+   LLVMValueRef a_right = LLVMBuildExtractElement(bld->builder, a, idx_right, "");
+   return LLVMBuildSub(bld->builder, a_right, a_left, "");
+}
+
+
+LLVMValueRef
+lp_build_scalar_ddy(struct lp_build_context *bld,
+                    LLVMValueRef a)
+{
+   LLVMValueRef idx_top    = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_TOP_LEFT, 0);
+   LLVMValueRef idx_bottom = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_BOTTOM_LEFT, 0);
+   LLVMValueRef a_top    = LLVMBuildExtractElement(bld->builder, a, idx_top, "");
+   LLVMValueRef a_bottom = LLVMBuildExtractElement(bld->builder, a, idx_bottom, "");
+   return LLVMBuildSub(bld->builder, a_bottom, a_top, "");
+}
-- 
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