/**************************************************************************
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*
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* Copyright 2010 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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**************************************************************************/
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#ifndef LP_BLD_QUAD_H_
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#define LP_BLD_QUAD_H_
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#include "gallivm/lp_bld.h"
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struct lp_build_context;
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/*
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* Each quad is composed of four elements.
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*
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* #########
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* # 0 | 1 #
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* #---+---#
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* # 2 | 3 #
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* #########
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*/
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enum lp_bld_quad {
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LP_BLD_QUAD_TOP_LEFT = 0,
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LP_BLD_QUAD_TOP_RIGHT = 1,
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LP_BLD_QUAD_BOTTOM_LEFT = 2,
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LP_BLD_QUAD_BOTTOM_RIGHT = 3
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};
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/*
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* (Vector) derivates.
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*
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* More than one quad is supported. The only requirement is that the vector
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* contains a whole number of quads:
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*
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* ######### ######### ...
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* # 0 | 1 # # 4 | 5 #
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* #---+---# #---+---# ...
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* # 2 | 3 # # 6 | 7 #
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* ######### ######### ...
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*/
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LLVMValueRef
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lp_build_ddx(struct lp_build_context *bld,
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LLVMValueRef a);
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LLVMValueRef
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lp_build_ddy(struct lp_build_context *bld,
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LLVMValueRef a);
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/*
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* Packed derivatives (one derivative for each direction per quad)
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*/
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LLVMValueRef
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lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,
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LLVMValueRef a, LLVMValueRef b);
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LLVMValueRef
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lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,
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LLVMValueRef a);
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/*
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* Twiddle from quad format to row format
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*/
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void
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lp_bld_quad_twiddle(struct gallivm_state *gallivm,
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struct lp_type lp_dst_type,
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const LLVMValueRef* src,
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unsigned src_count,
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LLVMValueRef* dst);
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#endif /* LP_BLD_QUAD_H_ */
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