3 * A collection of format conversion utility functions.
7 * Mesa 3-D graphics library
9 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
10 * Copyright (C) 2014 Intel Corporation All Rights Reserved.
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice shall be included
20 * in all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
23 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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31 #ifndef FORMAT_UTILS_H
32 #define FORMAT_UTILS_H
37 extern const mesa_array_format RGBA32_FLOAT
;
38 extern const mesa_array_format RGBA8_UBYTE
;
39 extern const mesa_array_format RGBA32_UINT
;
40 extern const mesa_array_format RGBA32_INT
;
42 /* Only guaranteed to work for BITS <= 32 */
43 #define MAX_UINT(BITS) ((BITS) == 32 ? UINT32_MAX : ((1u << (BITS)) - 1))
44 #define MAX_INT(BITS) ((int)MAX_UINT((BITS) - 1))
45 #define MIN_INT(BITS) ((BITS) == 32 ? INT32_MIN : (-(1 << (BITS - 1))))
47 /* Extends an integer of size SRC_BITS to one of size DST_BITS linearly */
48 #define EXTEND_NORMALIZED_INT(X, SRC_BITS, DST_BITS) \
49 (((X) * (int)(MAX_UINT(DST_BITS) / MAX_UINT(SRC_BITS))) + \
50 ((DST_BITS % SRC_BITS) ? ((X) >> (SRC_BITS - DST_BITS % SRC_BITS)) : 0))
53 _mesa_unorm_to_float(unsigned x
, unsigned src_bits
)
55 return x
* (1.0f
/ (float)MAX_UINT(src_bits
));
59 _mesa_snorm_to_float(int x
, unsigned src_bits
)
61 if (x
<= -MAX_INT(src_bits
))
64 return x
* (1.0f
/ (float)MAX_INT(src_bits
));
67 static inline uint16_t
68 _mesa_unorm_to_half(unsigned x
, unsigned src_bits
)
70 return _mesa_float_to_half(_mesa_unorm_to_float(x
, src_bits
));
73 static inline uint16_t
74 _mesa_snorm_to_half(int x
, unsigned src_bits
)
76 return _mesa_float_to_half(_mesa_snorm_to_float(x
, src_bits
));
79 static inline unsigned
80 _mesa_float_to_unorm(float x
, unsigned dst_bits
)
85 return MAX_UINT(dst_bits
);
87 return F_TO_I(x
* MAX_UINT(dst_bits
));
90 static inline unsigned
91 _mesa_half_to_unorm(uint16_t x
, unsigned dst_bits
)
93 return _mesa_float_to_unorm(_mesa_half_to_float(x
), dst_bits
);
96 static inline unsigned
97 _mesa_unorm_to_unorm(unsigned x
, unsigned src_bits
, unsigned dst_bits
)
99 if (src_bits
< dst_bits
)
100 return EXTEND_NORMALIZED_INT(x
, src_bits
, dst_bits
);
102 return x
>> (src_bits
- dst_bits
);
105 static inline unsigned
106 _mesa_snorm_to_unorm(int x
, unsigned src_bits
, unsigned dst_bits
)
111 return _mesa_unorm_to_unorm(x
, src_bits
- 1, dst_bits
);
115 _mesa_float_to_snorm(float x
, unsigned dst_bits
)
118 return -MAX_INT(dst_bits
);
120 return MAX_INT(dst_bits
);
122 return F_TO_I(x
* MAX_INT(dst_bits
));
126 _mesa_half_to_snorm(uint16_t x
, unsigned dst_bits
)
128 return _mesa_float_to_snorm(_mesa_half_to_float(x
), dst_bits
);
132 _mesa_unorm_to_snorm(unsigned x
, unsigned src_bits
, unsigned dst_bits
)
134 return _mesa_unorm_to_unorm(x
, src_bits
, dst_bits
- 1);
138 _mesa_snorm_to_snorm(int x
, unsigned src_bits
, unsigned dst_bits
)
140 if (x
< -MAX_INT(src_bits
))
141 return -MAX_INT(dst_bits
);
142 else if (src_bits
< dst_bits
)
143 return EXTEND_NORMALIZED_INT(x
, src_bits
- 1, dst_bits
- 1);
145 return x
>> (src_bits
- dst_bits
);
148 static inline unsigned
149 _mesa_unsigned_to_unsigned(unsigned src
, unsigned dst_size
)
151 return MIN2(src
, MAX_UINT(dst_size
));
155 _mesa_unsigned_to_signed(unsigned src
, unsigned dst_size
)
157 return MIN2(src
, MAX_INT(dst_size
));
161 _mesa_signed_to_signed(int src
, unsigned dst_size
)
163 return CLAMP(src
, MIN_INT(dst_size
), MAX_INT(dst_size
));
166 static inline unsigned
167 _mesa_signed_to_unsigned(int src
, unsigned dst_size
)
169 return CLAMP(src
, 0, MAX_UINT(dst_size
));
172 static inline unsigned
173 _mesa_float_to_unsigned(float src
, unsigned dst_bits
)
177 if (src
> (float)MAX_UINT(dst_bits
))
178 return MAX_UINT(dst_bits
);
179 return _mesa_signed_to_unsigned(src
, dst_bits
);
182 static inline unsigned
183 _mesa_float_to_signed(float src
, unsigned dst_bits
)
185 if (src
< (float)(-MAX_INT(dst_bits
)))
186 return -MAX_INT(dst_bits
);
187 if (src
> (float)MAX_INT(dst_bits
))
188 return MAX_INT(dst_bits
);
189 return _mesa_signed_to_signed(src
, dst_bits
);
192 static inline unsigned
193 _mesa_half_to_unsigned(uint16_t src
, unsigned dst_bits
)
195 if (_mesa_half_is_negative(src
))
197 return _mesa_unsigned_to_unsigned(_mesa_float_to_half(src
), dst_bits
);
200 static inline unsigned
201 _mesa_half_to_signed(uint16_t src
, unsigned dst_bits
)
203 return _mesa_float_to_signed(_mesa_half_to_float(src
), dst_bits
);
207 _mesa_format_to_array(mesa_format
, GLenum
*type
, int *num_components
,
208 uint8_t swizzle
[4], bool *normalized
);
211 _mesa_swizzle_and_convert(void *dst
,
212 enum mesa_array_format_datatype dst_type
,
213 int num_dst_channels
,
215 enum mesa_array_format_datatype src_type
,
216 int num_src_channels
,
217 const uint8_t swizzle
[4], bool normalized
, int count
);
220 _mesa_compute_rgba2base2rgba_component_mapping(GLenum baseFormat
, uint8_t *map
);
223 _mesa_format_convert(void *void_dst
, uint32_t dst_format
, size_t dst_stride
,
224 void *void_src
, uint32_t src_format
, size_t src_stride
,
225 size_t width
, size_t height
, uint8_t *rebase_swizzle
);