1 /*
2 * Copyright © 2014 Broadcom
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 /**
25 * @file vc4_formats.c
26 *
27 * Contains the table and accessors for VC4 texture and render target format
28 * support.
29 *
30 * The hardware has limited support for texture formats, and extremely limited
31 * support for render target formats. As a result, we emulate other formats
32 * in our shader code, and this stores the table for doing so.
33 */
34
35 #include "util/format/u_format.h"
36 #include "util/macros.h"
37
38 #include "vc4_context.h"
39
40 #define RT_NO 0
41 #define RT_RGBA8888 1
42 #define RT_RGB565 2
43
44 struct vc4_format {
45 /** Set if the pipe format is defined in the table. */
46 bool present;
47
48 /** Set to 0 if unsupported, 1 if RGBA8888, 2 if rgb565. */
49 uint8_t rt_type;
50
51 /** One of VC4_TEXTURE_TYPE_*. */
52 uint8_t tex_type;
53
54 /**
55 * Swizzle to apply to the RGBA shader output for storing to the tile
56 * buffer, to the RGBA tile buffer to produce shader input (for
57 * blending), and for turning the rgba8888 texture sampler return
58 * value into shader rgba values.
59 */
60 uint8_t swizzle[4];
61 };
62
63 #define SWIZ(x,y,z,w) { \
64 PIPE_SWIZZLE_##x, \
65 PIPE_SWIZZLE_##y, \
66 PIPE_SWIZZLE_##z, \
67 PIPE_SWIZZLE_##w \
68 }
69
70 #define FORMAT(pipe, rt, tex, swiz) \
71 [PIPE_FORMAT_##pipe] = { true, RT_##rt, VC4_TEXTURE_TYPE_##tex, swiz }
72
73 static const struct vc4_format vc4_format_table[] = {
74 FORMAT(R8G8B8A8_UNORM, RGBA8888, RGBA8888, SWIZ(X, Y, Z, W)),
75 FORMAT(R8G8B8X8_UNORM, RGBA8888, RGBA8888, SWIZ(X, Y, Z, 1)),
76 FORMAT(R8G8B8A8_SRGB, RGBA8888, RGBA8888, SWIZ(X, Y, Z, W)),
77 FORMAT(R8G8B8X8_SRGB, RGBA8888, RGBA8888, SWIZ(X, Y, Z, 1)),
78
79 FORMAT(B8G8R8A8_UNORM, RGBA8888, RGBA8888, SWIZ(Z, Y, X, W)),
80 FORMAT(B8G8R8X8_UNORM, RGBA8888, RGBA8888, SWIZ(Z, Y, X, 1)),
81 FORMAT(B8G8R8A8_SRGB, RGBA8888, RGBA8888, SWIZ(Z, Y, X, W)),
82 FORMAT(B8G8R8X8_SRGB, RGBA8888, RGBA8888, SWIZ(Z, Y, X, 1)),
83
84 FORMAT(B5G6R5_UNORM, RGB565, RGB565, SWIZ(X, Y, Z, 1)),
85
86 FORMAT(ETC1_RGB8, NO, ETC1, SWIZ(X, Y, Z, 1)),
87
88 /* Depth sampling will be handled by doing nearest filtering and not
89 * unpacking the RGBA value.
90 */
91 FORMAT(S8_UINT_Z24_UNORM, NO, RGBA8888, SWIZ(X, Y, Z, W)),
92 FORMAT(X8Z24_UNORM, NO, RGBA8888, SWIZ(X, Y, Z, W)),
93
94 FORMAT(B4G4R4A4_UNORM, NO, RGBA4444, SWIZ(Y, Z, W, X)),
95 FORMAT(B4G4R4X4_UNORM, NO, RGBA4444, SWIZ(Y, Z, W, 1)),
96
97 FORMAT(A1B5G5R5_UNORM, NO, RGBA5551, SWIZ(X, Y, Z, W)),
98 FORMAT(X1B5G5R5_UNORM, NO, RGBA5551, SWIZ(X, Y, Z, 1)),
99
100 FORMAT(A8_UNORM, NO, ALPHA, SWIZ(0, 0, 0, W)),
101 FORMAT(L8_UNORM, NO, ALPHA, SWIZ(W, W, W, 1)),
102 FORMAT(I8_UNORM, NO, ALPHA, SWIZ(W, W, W, W)),
103 FORMAT(R8_UNORM, NO, ALPHA, SWIZ(W, 0, 0, 1)),
104
105 FORMAT(L8A8_UNORM, NO, LUMALPHA, SWIZ(X, X, X, W)),
106 FORMAT(R8G8_UNORM, NO, LUMALPHA, SWIZ(X, W, 0, 1)),
107 };
108
109 static const struct vc4_format *
get_format(enum pipe_format f)110 get_format(enum pipe_format f)
111 {
112 if (f >= ARRAY_SIZE(vc4_format_table) ||
113 !vc4_format_table[f].present)
114 return NULL;
115 else
116 return &vc4_format_table[f];
117 }
118
119 bool
vc4_rt_format_supported(enum pipe_format f)120 vc4_rt_format_supported(enum pipe_format f)
121 {
122 const struct vc4_format *vf = get_format(f);
123
124 if (!vf)
125 return false;
126
127 return vf->rt_type != RT_NO;
128 }
129
130 bool
vc4_rt_format_is_565(enum pipe_format f)131 vc4_rt_format_is_565(enum pipe_format f)
132 {
133 const struct vc4_format *vf = get_format(f);
134
135 if (!vf)
136 return false;
137
138 return vf->rt_type == RT_RGB565;
139 }
140
141 bool
vc4_tex_format_supported(enum pipe_format f)142 vc4_tex_format_supported(enum pipe_format f)
143 {
144 const struct vc4_format *vf = get_format(f);
145
146 return vf != NULL;
147 }
148
149 uint8_t
vc4_get_tex_format(enum pipe_format f)150 vc4_get_tex_format(enum pipe_format f)
151 {
152 const struct vc4_format *vf = get_format(f);
153
154 if (!vf)
155 return 0;
156
157 return vf->tex_type;
158 }
159
160 const uint8_t *
vc4_get_format_swizzle(enum pipe_format f)161 vc4_get_format_swizzle(enum pipe_format f)
162 {
163 const struct vc4_format *vf = get_format(f);
164 static const uint8_t fallback[] = {0, 1, 2, 3};
165
166 if (!vf)
167 return fallback;
168
169 return vf->swizzle;
170 }
171