text: /**************************************************************************
   *
   * 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);
  
  
  /*
   * Scalar derivatives.
   *
   * Same as getting the first value of above.
   */
  
  LLVMValueRef
  lp_build_scalar_ddx(struct lp_build_context *bld,
                      LLVMValueRef a);
  
  
  LLVMValueRef
  lp_build_scalar_ddy(struct lp_build_context *bld,
                      LLVMValueRef a);
  
  
  #endif /* LP_BLD_QUAD_H_ */
  