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 "vk_standard_sample_locations.h"
25
26 #include "vk_graphics_state.h"
27
28 /**
29 * 1x MSAA has a single sample at the center: (0.5, 0.5) -> (0x8, 0x8).
30 */
31 static const struct vk_sample_locations_state sample_locations_state_1x = {
32 .per_pixel = VK_SAMPLE_COUNT_1_BIT,
33 .grid_size = { 1, 1 },
34 .locations = {
35 { 0.5, 0.5 },
36 },
37 };
38
39
40 /**
41 * 2x MSAA sample positions are (0.25, 0.25) and (0.75, 0.75):
42 * 4 c
43 * 4 0
44 * c 1
45 */
46 static const struct vk_sample_locations_state sample_locations_state_2x = {
47 .per_pixel = VK_SAMPLE_COUNT_2_BIT,
48 .grid_size = { 1, 1 },
49 .locations = {
50 { 0.75, 0.75 },
51 { 0.25, 0.25 },
52 },
53 };
54
55 /**
56 * Sample positions:
57 * 2 6 a e
58 * 2 0
59 * 6 1
60 * a 2
61 * e 3
62 */
63 static const struct vk_sample_locations_state sample_locations_state_4x = {
64 .per_pixel = VK_SAMPLE_COUNT_4_BIT,
65 .grid_size = { 1, 1 },
66 .locations = {
67 { 0.375, 0.125 },
68 { 0.875, 0.375 },
69 { 0.125, 0.625 },
70 { 0.625, 0.875 },
71 },
72 };
73
74 /**
75 * Sample positions:
76 * 1 3 5 7 9 b d f
77 * 1 7
78 * 3 3
79 * 5 0
80 * 7 5
81 * 9 2
82 * b 1
83 * d 4
84 * f 6
85 */
86 static const struct vk_sample_locations_state sample_locations_state_8x = {
87 .per_pixel = VK_SAMPLE_COUNT_8_BIT,
88 .grid_size = { 1, 1 },
89 .locations = {
90 { 0.5625, 0.3125 },
91 { 0.4375, 0.6875 },
92 { 0.8125, 0.5625 },
93 { 0.3125, 0.1875 },
94 { 0.1875, 0.8125 },
95 { 0.0625, 0.4375 },
96 { 0.6875, 0.9375 },
97 { 0.9375, 0.0625 },
98 },
99 };
100
101 /**
102 * Sample positions:
103 *
104 * 0 1 2 3 4 5 6 7 8 9 a b c d e f
105 * 0 15
106 * 1 9
107 * 2 10
108 * 3 7
109 * 4 13
110 * 5 1
111 * 6 4
112 * 7 3
113 * 8 12
114 * 9 0
115 * a 2
116 * b 6
117 * c 11
118 * d 5
119 * e 8
120 * f 14
121 */
122 static const struct vk_sample_locations_state sample_locations_state_16x = {
123 .per_pixel = VK_SAMPLE_COUNT_16_BIT,
124 .grid_size = { 1, 1 },
125 .locations = {
126 { 0.5625, 0.5625 },
127 { 0.4375, 0.3125 },
128 { 0.3125, 0.6250 },
129 { 0.7500, 0.4375 },
130 { 0.1875, 0.3750 },
131 { 0.6250, 0.8125 },
132 { 0.8125, 0.6875 },
133 { 0.6875, 0.1875 },
134 { 0.3750, 0.8750 },
135 { 0.5000, 0.0625 },
136 { 0.2500, 0.1250 },
137 { 0.1250, 0.7500 },
138 { 0.0000, 0.5000 },
139 { 0.9375, 0.2500 },
140 { 0.8750, 0.9375 },
141 { 0.0625, 0.0000 },
142 },
143 };
144
145 const struct vk_sample_locations_state *
vk_standard_sample_locations_state(VkSampleCountFlagBits sample_count)146 vk_standard_sample_locations_state(VkSampleCountFlagBits sample_count)
147 {
148 switch (sample_count) {
149 case 1: return &sample_locations_state_1x;
150 case 2: return &sample_locations_state_2x;
151 case 4: return &sample_locations_state_4x;
152 case 8: return &sample_locations_state_8x;
153 case 16: return &sample_locations_state_16x;
154 default: unreachable("Sample count has no standard locations");
155 }
156 }
157