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
36struct 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
49enum 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
70LLVMValueRef
71lp_build_ddx(struct lp_build_context *bld,
72             LLVMValueRef a);
73
74
75LLVMValueRef
76lp_build_ddy(struct lp_build_context *bld,
77             LLVMValueRef a);
78
79
80/*
81 * Packed derivatives (one derivative for each direction per quad)
82 */
83LLVMValueRef
84lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,
85                                 LLVMValueRef a, LLVMValueRef b);
86
87LLVMValueRef
88lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,
89                                 LLVMValueRef a);
90
91
92#endif /* LP_BLD_QUAD_H_ */
93