1 /* 2 * Copyright © 2020 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 24 #include "intel_sample_positions.h" 25 26 /** 27 * 1x MSAA has a single sample at the center: (0.5, 0.5) -> (0x8, 0x8). 28 */ 29 const struct intel_sample_position intel_sample_positions_1x[] = { 30 { 0.5, 0.5, }, 31 }; 32 33 /** 34 * 2x MSAA sample positions are (0.25, 0.25) and (0.75, 0.75): 35 * 4 c 36 * 4 0 37 * c 1 38 */ 39 const struct intel_sample_position intel_sample_positions_2x[] = { 40 { 0.75, 0.75 }, 41 { 0.25, 0.25 }, 42 }; 43 44 /** 45 * Sample positions: 46 * 2 6 a e 47 * 2 0 48 * 6 1 49 * a 2 50 * e 3 51 */ 52 const struct intel_sample_position intel_sample_positions_4x[] = { 53 { 0.375, 0.125 }, 54 { 0.875, 0.375 }, 55 { 0.125, 0.625 }, 56 { 0.625, 0.875 }, 57 }; 58 59 /** 60 * Sample positions: 61 * 62 * From the Ivy Bridge PRM, Vol2 Part1 p304 (3DSTATE_MULTISAMPLE: 63 * Programming Notes): 64 * "When programming the sample offsets (for NUMSAMPLES_4 or _8 and 65 * MSRASTMODE_xxx_PATTERN), the order of the samples 0 to 3 (or 7 66 * for 8X) must have monotonically increasing distance from the 67 * pixel center. This is required to get the correct centroid 68 * computation in the device." 69 * 70 * Sample positions: 71 * 1 3 5 7 9 b d f 72 * 1 7 73 * 3 3 74 * 5 0 75 * 7 5 76 * 9 2 77 * b 1 78 * d 4 79 * f 6 80 */ 81 const struct intel_sample_position intel_sample_positions_8x[] = { 82 { 0.5625, 0.3125 }, 83 { 0.4375, 0.6875 }, 84 { 0.8125, 0.5625 }, 85 { 0.3125, 0.1875 }, 86 { 0.1875, 0.8125 }, 87 { 0.0625, 0.4375 }, 88 { 0.6875, 0.9375 }, 89 { 0.9375, 0.0625 }, 90 }; 91 92 /** 93 * Sample positions: 94 * 95 * 0 1 2 3 4 5 6 7 8 9 a b c d e f 96 * 0 15 97 * 1 9 98 * 2 10 99 * 3 7 100 * 4 13 101 * 5 1 102 * 6 4 103 * 7 3 104 * 8 12 105 * 9 0 106 * a 2 107 * b 6 108 * c 11 109 * d 5 110 * e 8 111 * f 14 112 */ 113 const struct intel_sample_position intel_sample_positions_16x[] = { 114 { 0.5625, 0.5625 }, 115 { 0.4375, 0.3125 }, 116 { 0.3125, 0.6250 }, 117 { 0.7500, 0.4375 }, 118 { 0.1875, 0.3750 }, 119 { 0.6250, 0.8125 }, 120 { 0.8125, 0.6875 }, 121 { 0.6875, 0.1875 }, 122 { 0.3750, 0.8750 }, 123 { 0.5000, 0.0625 }, 124 { 0.2500, 0.1250 }, 125 { 0.1250, 0.7500 }, 126 { 0.0000, 0.5000 }, 127 { 0.9375, 0.2500 }, 128 { 0.8750, 0.9375 }, 129 { 0.0625, 0.0000 }, 130 }; 131