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
44struct 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
73static 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
109static const struct vc4_format *
110get_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
119bool
120vc4_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
130bool
131vc4_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
141bool
142vc4_tex_format_supported(enum pipe_format f)
143{
144        const struct vc4_format *vf = get_format(f);
145
146        return vf != NULL;
147}
148
149uint8_t
150vc4_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
160const uint8_t *
161vc4_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