1 /* 2 * Copyright © 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 #ifndef GEN_SAMPLE_POSITIONS_H 24 #define GEN_SAMPLE_POSITIONS_H 25 26 /* 27 * This file defines the standard multisample positions used by both GL and 28 * Vulkan. These correspond to the Vulkan "standard sample locations". 29 */ 30 31 /** 32 * 1x MSAA has a single sample at the center: (0.5, 0.5) -> (0x8, 0x8). 33 */ 34 #define GEN_SAMPLE_POS_1X(prefix) \ 35 prefix##0XOffset = 0.5; \ 36 prefix##0YOffset = 0.5; 37 38 /** 39 * 2x MSAA sample positions are (0.25, 0.25) and (0.75, 0.75): 40 * 4 c 41 * 4 0 42 * c 1 43 */ 44 #define GEN_SAMPLE_POS_2X(prefix) \ 45 prefix##0XOffset = 0.75; \ 46 prefix##0YOffset = 0.75; \ 47 prefix##1XOffset = 0.25; \ 48 prefix##1YOffset = 0.25; 49 50 /** 51 * Sample positions: 52 * 2 6 a e 53 * 2 0 54 * 6 1 55 * a 2 56 * e 3 57 */ 58 #define GEN_SAMPLE_POS_4X(prefix) \ 59 prefix##0XOffset = 0.375; \ 60 prefix##0YOffset = 0.125; \ 61 prefix##1XOffset = 0.875; \ 62 prefix##1YOffset = 0.375; \ 63 prefix##2XOffset = 0.125; \ 64 prefix##2YOffset = 0.625; \ 65 prefix##3XOffset = 0.625; \ 66 prefix##3YOffset = 0.875; 67 68 /** 69 * Sample positions: 70 * 71 * From the Ivy Bridge PRM, Vol2 Part1 p304 (3DSTATE_MULTISAMPLE: 72 * Programming Notes): 73 * "When programming the sample offsets (for NUMSAMPLES_4 or _8 and 74 * MSRASTMODE_xxx_PATTERN), the order of the samples 0 to 3 (or 7 75 * for 8X) must have monotonically increasing distance from the 76 * pixel center. This is required to get the correct centroid 77 * computation in the device." 78 * 79 * Sample positions: 80 * 1 3 5 7 9 b d f 81 * 1 7 82 * 3 3 83 * 5 0 84 * 7 5 85 * 9 2 86 * b 1 87 * d 4 88 * f 6 89 */ 90 #define GEN_SAMPLE_POS_8X(prefix) \ 91 prefix##0XOffset = 0.5625; \ 92 prefix##0YOffset = 0.3125; \ 93 prefix##1XOffset = 0.4375; \ 94 prefix##1YOffset = 0.6875; \ 95 prefix##2XOffset = 0.8125; \ 96 prefix##2YOffset = 0.5625; \ 97 prefix##3XOffset = 0.3125; \ 98 prefix##3YOffset = 0.1875; \ 99 prefix##4XOffset = 0.1875; \ 100 prefix##4YOffset = 0.8125; \ 101 prefix##5XOffset = 0.0625; \ 102 prefix##5YOffset = 0.4375; \ 103 prefix##6XOffset = 0.6875; \ 104 prefix##6YOffset = 0.9375; \ 105 prefix##7XOffset = 0.9375; \ 106 prefix##7YOffset = 0.0625; 107 108 /** 109 * Sample positions: 110 * 111 * 0 1 2 3 4 5 6 7 8 9 a b c d e f 112 * 0 15 113 * 1 9 114 * 2 10 115 * 3 7 116 * 4 13 117 * 5 1 118 * 6 4 119 * 7 3 120 * 8 12 121 * 9 0 122 * a 2 123 * b 6 124 * c 11 125 * d 5 126 * e 8 127 * f 14 128 */ 129 #define GEN_SAMPLE_POS_16X(prefix) \ 130 prefix##0XOffset = 0.5625; \ 131 prefix##0YOffset = 0.5625; \ 132 prefix##1XOffset = 0.4375; \ 133 prefix##1YOffset = 0.3125; \ 134 prefix##2XOffset = 0.3125; \ 135 prefix##2YOffset = 0.6250; \ 136 prefix##3XOffset = 0.7500; \ 137 prefix##3YOffset = 0.4375; \ 138 prefix##4XOffset = 0.1875; \ 139 prefix##4YOffset = 0.3750; \ 140 prefix##5XOffset = 0.6250; \ 141 prefix##5YOffset = 0.8125; \ 142 prefix##6XOffset = 0.8125; \ 143 prefix##6YOffset = 0.6875; \ 144 prefix##7XOffset = 0.6875; \ 145 prefix##7YOffset = 0.1875; \ 146 prefix##8XOffset = 0.3750; \ 147 prefix##8YOffset = 0.8750; \ 148 prefix##9XOffset = 0.5000; \ 149 prefix##9YOffset = 0.0625; \ 150 prefix##10XOffset = 0.2500; \ 151 prefix##10YOffset = 0.1250; \ 152 prefix##11XOffset = 0.1250; \ 153 prefix##11YOffset = 0.7500; \ 154 prefix##12XOffset = 0.0000; \ 155 prefix##12YOffset = 0.5000; \ 156 prefix##13XOffset = 0.9375; \ 157 prefix##13YOffset = 0.2500; \ 158 prefix##14XOffset = 0.8750; \ 159 prefix##14YOffset = 0.9375; \ 160 prefix##15XOffset = 0.0625; \ 161 prefix##15YOffset = 0.0000; 162 163 #endif /* GEN_SAMPLE_POSITIONS_H */ 164