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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/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