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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.
*
**************************************************************************/
#ifndef LP_BLD_QUAD_H_
#define LP_BLD_QUAD_H_
#include "gallivm/lp_bld.h"
struct lp_build_context;
/*
* Each quad is composed of four elements.
*
* #########
* # 0 | 1 #
* #---+---#
* # 2 | 3 #
* #########
*/
enum lp_bld_quad {
LP_BLD_QUAD_TOP_LEFT = 0,
LP_BLD_QUAD_TOP_RIGHT = 1,
LP_BLD_QUAD_BOTTOM_LEFT = 2,
LP_BLD_QUAD_BOTTOM_RIGHT = 3
};
/*
* (Vector) derivates.
*
* More than one quad is supported. The only requirement is that the vector
* contains a whole number of quads:
*
* ######### ######### ...
* # 0 | 1 # # 4 | 5 #
* #---+---# #---+---# ...
* # 2 | 3 # # 6 | 7 #
* ######### ######### ...
*/
LLVMValueRef
lp_build_ddx(struct lp_build_context *bld,
LLVMValueRef a);
LLVMValueRef
lp_build_ddy(struct lp_build_context *bld,
LLVMValueRef a);
/*
* Packed derivatives (one derivative for each direction per quad)
*/
LLVMValueRef
lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,
LLVMValueRef a, LLVMValueRef b);
LLVMValueRef
lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,
LLVMValueRef a);
/*
* Twiddle from quad format to row format
*/
void
lp_bld_quad_twiddle(struct gallivm_state *gallivm,
struct lp_type lp_dst_type,
const LLVMValueRef* src,
unsigned src_count,
LLVMValueRef* dst);
#endif /* LP_BLD_QUAD_H_ */
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