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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.