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/**************************************************************************
*
* 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_const.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_swizzle_aos(bld, a, swizzle_left);
LLVMValueRef a_right = lp_build_swizzle_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_swizzle_aos(bld, a, swizzle_top);
LLVMValueRef a_bottom = lp_build_swizzle_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)
{
LLVMBuilderRef builder = bld->gallivm->builder;
LLVMValueRef idx_left = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_TOP_LEFT);
LLVMValueRef idx_right = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_TOP_RIGHT);
LLVMValueRef a_left = LLVMBuildExtractElement(builder, a, idx_left, "left");
LLVMValueRef a_right = LLVMBuildExtractElement(builder, a, idx_right, "right");
if (bld->type.floating)
return LLVMBuildFSub(builder, a_right, a_left, "ddx");
else
return LLVMBuildSub(builder, a_right, a_left, "ddx");
}
LLVMValueRef
lp_build_scalar_ddy(struct lp_build_context *bld,
LLVMValueRef a)
{
LLVMBuilderRef builder = bld->gallivm->builder;
LLVMValueRef idx_top = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_TOP_LEFT);
LLVMValueRef idx_bottom = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_BOTTOM_LEFT);
LLVMValueRef a_top = LLVMBuildExtractElement(builder, a, idx_top, "top");
LLVMValueRef a_bottom = LLVMBuildExtractElement(builder, a, idx_bottom, "bottom");
if (bld->type.floating)
return LLVMBuildFSub(builder, a_bottom, a_top, "ddy");
else
return LLVMBuildSub(builder, a_bottom, a_top, "ddy");
}
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