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1COPYRIGHT = """\
2/*
3 * Copyright 2017 Google
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial portions
15 * of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
20 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
21 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25"""
26
27# stdlib
28import argparse
29from sys import stdout
30from mako.template import Template
31
32# local
33import format_parser
34
35def parse_args():
36    p = argparse.ArgumentParser()
37    p.add_argument("csv")
38    p.add_argument("out")
39    return p.parse_args()
40
41def get_unorm_to_srgb_map(formats):
42    names = set(fmt.name for fmt in formats)
43
44    for fmt in formats:
45        if fmt.colorspace != 'srgb':
46            continue;
47
48        replacements = [
49            ('SRGB', 'RGB'),
50            ('SRGB', 'UNORM'),
51            ('SRGB8_ALPHA8', 'RGBA'),
52            ('SRGB8_ALPHA8', 'RGBA8'),
53            ('SRGB_ALPHA_UNORM', 'RGBA_UNORM'),
54        ]
55        found_unorm_name = False
56        for rep in replacements:
57            if fmt.name.find(rep[0]) == -1:
58                continue
59
60            unorm_name = fmt.name.replace(rep[0], rep[1])
61            if unorm_name in names:
62                yield unorm_name, fmt.name
63                found_unorm_name = True
64                break
65
66        # Every sRGB format MUST have a UNORM equivalent
67        assert found_unorm_name
68
69def get_rgbx_to_rgba_map(formats):
70    names = set(fmt.name for fmt in formats)
71
72    for fmt in formats:
73        if not fmt.has_channel('r') or not fmt.has_channel('x'):
74            continue
75
76        # The condition above will still let MESA_FORMAT_R9G9B9E5_FLOAT
77        # through.  We need to ensure it actually has an X in the name.
78        if not 'X' in fmt.name:
79            continue
80
81        rgbx_name = fmt.name
82        rgba_name = rgbx_name.replace("X", "A")
83        if rgba_name not in names:
84            continue;
85
86        yield rgbx_name, rgba_name
87
88TEMPLATE = Template(COPYRIGHT + """
89#include "formats.h"
90#include "util/macros.h"
91
92/**
93 * For an sRGB format, return the corresponding linear color space format.
94 * For non-sRGB formats, return the format as-is.
95 */
96mesa_format
97_mesa_get_srgb_format_linear(mesa_format format)
98{
99   switch (format) {
100%for unorm, srgb in unorm_to_srgb_map:
101   case ${srgb}:
102      return ${unorm};
103%endfor
104   default:
105      return format;
106   }
107}
108
109/**
110 * For a linear format, return the corresponding sRGB color space format.
111 * For an sRGB format, return the format as-is.
112 * Assert-fails if the format is not sRGB and does not have an sRGB equivalent.
113 */
114mesa_format
115_mesa_get_linear_format_srgb(mesa_format format)
116{
117   switch (format) {
118%for unorm, srgb in unorm_to_srgb_map:
119   case ${unorm}:
120      return ${srgb};
121%endfor
122%for unorm, srgb in unorm_to_srgb_map:
123   case ${srgb}:
124%endfor
125      return format;
126   default:
127      unreachable("Given format does not have an sRGB equivalent");
128   }
129}
130
131/**
132 * If the format has an alpha channel, and there exists a non-alpha
133 * variant of the format with an identical bit layout, then return
134 * the non-alpha format. Otherwise return the original format.
135 *
136 * Examples:
137 *    Fallback exists:
138 *       MESA_FORMAT_R8G8B8X8_UNORM -> MESA_FORMAT_R8G8B8A8_UNORM
139 *       MESA_FORMAT_RGBX_UNORM16 -> MESA_FORMAT_RGBA_UNORM16
140 *
141 *    No fallback:
142 *       MESA_FORMAT_R8G8B8A8_UNORM -> MESA_FORMAT_R8G8B8A8_UNORM
143 *       MESA_FORMAT_Z_FLOAT32 -> MESA_FORMAT_Z_FLOAT32
144 */
145mesa_format
146_mesa_format_fallback_rgbx_to_rgba(mesa_format format)
147{
148   switch (format) {
149%for rgbx, rgba in rgbx_to_rgba_map:
150   case ${rgbx}:
151      return ${rgba};
152%endfor
153   default:
154      return format;
155   }
156}
157""");
158
159def main():
160    pargs = parse_args()
161
162    formats = list(format_parser.parse(pargs.csv))
163
164    template_env = {
165        'unorm_to_srgb_map': list(get_unorm_to_srgb_map(formats)),
166        'rgbx_to_rgba_map': list(get_rgbx_to_rgba_map(formats)),
167    }
168
169    with open(pargs.out, 'w') as f:
170        f.write(TEMPLATE.render(**template_env))
171
172if __name__ == "__main__":
173    main()
174