src/gallium/auxiliary/gallivm/lp_bld_quad.h

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   3  * Copyright 2010 VMware, Inc.
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  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  * Scalar derivatives.
  82  *
  83  * Same as getting the first value of above.
  84  */
  85
  86 LLVMValueRef
  87 lp_build_scalar_ddx(struct lp_build_context *bld,
  88                     LLVMValueRef a);
  89
  90
  91 LLVMValueRef
  92 lp_build_scalar_ddy(struct lp_build_context *bld,
  93                     LLVMValueRef a);
  94
  95
  96 #endif /* LP_BLD_QUAD_H_ */