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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  * 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