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      1 /**************************************************************************
      2  *
      3  * Copyright 2010 VMware, Inc.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
     21  *
     22  * The above copyright notice and this permission notice (including the
     23  * next paragraph) shall be included in all copies or substantial portions
     24  * of the Software.
     25  *
     26  **************************************************************************/
     27 
     28 
     29 #ifndef LP_BLD_QUAD_H_
     30 #define LP_BLD_QUAD_H_
     31 
     32 
     33 #include "gallivm/lp_bld.h"
     34 
     35 
     36 struct lp_build_context;
     37 
     38 
     39 /*
     40  * Each quad is composed of four elements.
     41  *
     42  * #########
     43  * # 0 | 1 #
     44  * #---+---#
     45  * # 2 | 3 #
     46  * #########
     47  */
     48 
     49 enum lp_bld_quad {
     50    LP_BLD_QUAD_TOP_LEFT     = 0,
     51    LP_BLD_QUAD_TOP_RIGHT    = 1,
     52    LP_BLD_QUAD_BOTTOM_LEFT  = 2,
     53    LP_BLD_QUAD_BOTTOM_RIGHT = 3
     54 };
     55 
     56 
     57 /*
     58  * (Vector) derivates.
     59  *
     60  * More than one quad is supported. The only requirement is that the vector
     61  * contains a whole number of quads:
     62  *
     63  * ######### ######### ...
     64  * # 0 | 1 # # 4 | 5 #
     65  * #---+---# #---+---# ...
     66  * # 2 | 3 # # 6 | 7 #
     67  * ######### ######### ...
     68  */
     69 
     70 LLVMValueRef
     71 lp_build_ddx(struct lp_build_context *bld,
     72              LLVMValueRef a);
     73 
     74 
     75 LLVMValueRef
     76 lp_build_ddy(struct lp_build_context *bld,
     77              LLVMValueRef a);
     78 
     79 
     80 /*
     81  * Packed derivatives (one derivative for each direction per quad)
     82  */
     83 LLVMValueRef
     84 lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,
     85                                  LLVMValueRef a, LLVMValueRef b);
     86 
     87 LLVMValueRef
     88 lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,
     89                                  LLVMValueRef a);
     90 
     91 /*
     92  * Twiddle from quad format to row format
     93  */
     94 void
     95 lp_bld_quad_twiddle(struct gallivm_state *gallivm,
     96                     struct lp_type lp_dst_type,
     97                     const LLVMValueRef* src,
     98                     unsigned src_count,
     99                     LLVMValueRef* dst);
    100 
    101 #endif /* LP_BLD_QUAD_H_ */
    102