1 /** 2 * \file format_utils.h 3 * A collection of format conversion utility functions. 4 */ 5 6 /* 7 * Mesa 3-D graphics library 8 * 9 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. 10 * Copyright (C) 2014 Intel Corporation All Rights Reserved. 11 * 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: 18 * 19 * The above copyright notice and this permission notice shall be included 20 * in all copies or substantial portions of the Software. 21 * 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 25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 28 * OTHER DEALINGS IN THE SOFTWARE. 29 */ 30 31 #ifndef FORMAT_UTILS_H 32 #define FORMAT_UTILS_H 33 34 #include "formats.h" 35 #include "imports.h" 36 #include "macros.h" 37 #include "util/rounding.h" 38 #include "util/half_float.h" 39 40 extern const mesa_array_format RGBA32_FLOAT; 41 extern const mesa_array_format RGBA8_UBYTE; 42 extern const mesa_array_format RGBA32_UINT; 43 extern const mesa_array_format RGBA32_INT; 44 45 /* Only guaranteed to work for BITS <= 32 */ 46 #define MAX_UINT(BITS) ((BITS) == 32 ? UINT32_MAX : ((1u << (BITS)) - 1)) 47 #define MAX_INT(BITS) ((int)MAX_UINT((BITS) - 1)) 48 #define MIN_INT(BITS) ((BITS) == 32 ? INT32_MIN : (-(1 << (BITS - 1)))) 49 50 /* Extends an integer of size SRC_BITS to one of size DST_BITS linearly */ 51 #define EXTEND_NORMALIZED_INT(X, SRC_BITS, DST_BITS) \ 52 (((X) * (int)(MAX_UINT(DST_BITS) / MAX_UINT(SRC_BITS))) + \ 53 ((DST_BITS % SRC_BITS) ? ((X) >> (SRC_BITS - DST_BITS % SRC_BITS)) : 0)) 54 55 static inline float 56 _mesa_unorm_to_float(unsigned x, unsigned src_bits) 57 { 58 return x * (1.0f / (float)MAX_UINT(src_bits)); 59 } 60 61 static inline float 62 _mesa_snorm_to_float(int x, unsigned src_bits) 63 { 64 if (x <= -MAX_INT(src_bits)) 65 return -1.0f; 66 else 67 return x * (1.0f / (float)MAX_INT(src_bits)); 68 } 69 70 static inline uint16_t 71 _mesa_unorm_to_half(unsigned x, unsigned src_bits) 72 { 73 return _mesa_float_to_half(_mesa_unorm_to_float(x, src_bits)); 74 } 75 76 static inline uint16_t 77 _mesa_snorm_to_half(int x, unsigned src_bits) 78 { 79 return _mesa_float_to_half(_mesa_snorm_to_float(x, src_bits)); 80 } 81 82 static inline unsigned 83 _mesa_float_to_unorm(float x, unsigned dst_bits) 84 { 85 if (x < 0.0f) 86 return 0; 87 else if (x > 1.0f) 88 return MAX_UINT(dst_bits); 89 else 90 return _mesa_i64roundevenf(x * MAX_UINT(dst_bits)); 91 } 92 93 static inline unsigned 94 _mesa_half_to_unorm(uint16_t x, unsigned dst_bits) 95 { 96 return _mesa_float_to_unorm(_mesa_half_to_float(x), dst_bits); 97 } 98 99 static inline unsigned 100 _mesa_unorm_to_unorm(unsigned x, unsigned src_bits, unsigned dst_bits) 101 { 102 if (src_bits < dst_bits) { 103 return EXTEND_NORMALIZED_INT(x, src_bits, dst_bits); 104 } else if (src_bits > dst_bits) { 105 unsigned src_half = (1 << (src_bits - 1)) - 1; 106 107 if (src_bits + dst_bits > sizeof(x) * 8) { 108 assert(src_bits + dst_bits <= sizeof(uint64_t) * 8); 109 return (((uint64_t) x * MAX_UINT(dst_bits) + src_half) / 110 MAX_UINT(src_bits)); 111 } else { 112 return (x * MAX_UINT(dst_bits) + src_half) / MAX_UINT(src_bits); 113 } 114 } else { 115 return x; 116 } 117 } 118 119 static inline unsigned 120 _mesa_snorm_to_unorm(int x, unsigned src_bits, unsigned dst_bits) 121 { 122 if (x < 0) 123 return 0; 124 else 125 return _mesa_unorm_to_unorm(x, src_bits - 1, dst_bits); 126 } 127 128 static inline int 129 _mesa_float_to_snorm(float x, unsigned dst_bits) 130 { 131 if (x < -1.0f) 132 return -MAX_INT(dst_bits); 133 else if (x > 1.0f) 134 return MAX_INT(dst_bits); 135 else 136 return _mesa_lroundevenf(x * MAX_INT(dst_bits)); 137 } 138 139 static inline int 140 _mesa_half_to_snorm(uint16_t x, unsigned dst_bits) 141 { 142 return _mesa_float_to_snorm(_mesa_half_to_float(x), dst_bits); 143 } 144 145 static inline int 146 _mesa_unorm_to_snorm(unsigned x, unsigned src_bits, unsigned dst_bits) 147 { 148 return _mesa_unorm_to_unorm(x, src_bits, dst_bits - 1); 149 } 150 151 static inline int 152 _mesa_snorm_to_snorm(int x, unsigned src_bits, unsigned dst_bits) 153 { 154 if (x < -MAX_INT(src_bits)) 155 return -MAX_INT(dst_bits); 156 else if (src_bits < dst_bits) 157 return EXTEND_NORMALIZED_INT(x, src_bits - 1, dst_bits - 1); 158 else 159 return x >> (src_bits - dst_bits); 160 } 161 162 static inline unsigned 163 _mesa_unsigned_to_unsigned(unsigned src, unsigned dst_size) 164 { 165 return MIN2(src, MAX_UINT(dst_size)); 166 } 167 168 static inline int 169 _mesa_unsigned_to_signed(unsigned src, unsigned dst_size) 170 { 171 return MIN2(src, (unsigned)MAX_INT(dst_size)); 172 } 173 174 static inline int 175 _mesa_signed_to_signed(int src, unsigned dst_size) 176 { 177 return CLAMP(src, MIN_INT(dst_size), MAX_INT(dst_size)); 178 } 179 180 static inline unsigned 181 _mesa_signed_to_unsigned(int src, unsigned dst_size) 182 { 183 return CLAMP(src, 0, MAX_UINT(dst_size)); 184 } 185 186 static inline unsigned 187 _mesa_float_to_unsigned(float src, unsigned dst_bits) 188 { 189 if (src < 0.0f) 190 return 0; 191 if (src > (float)MAX_UINT(dst_bits)) 192 return MAX_UINT(dst_bits); 193 return _mesa_signed_to_unsigned(src, dst_bits); 194 } 195 196 static inline unsigned 197 _mesa_float_to_signed(float src, unsigned dst_bits) 198 { 199 if (src < (float)(-MAX_INT(dst_bits))) 200 return -MAX_INT(dst_bits); 201 if (src > (float)MAX_INT(dst_bits)) 202 return MAX_INT(dst_bits); 203 return _mesa_signed_to_signed(src, dst_bits); 204 } 205 206 static inline unsigned 207 _mesa_half_to_unsigned(uint16_t src, unsigned dst_bits) 208 { 209 if (_mesa_half_is_negative(src)) 210 return 0; 211 return _mesa_unsigned_to_unsigned(_mesa_float_to_half(src), dst_bits); 212 } 213 214 static inline unsigned 215 _mesa_half_to_signed(uint16_t src, unsigned dst_bits) 216 { 217 return _mesa_float_to_signed(_mesa_half_to_float(src), dst_bits); 218 } 219 220 bool 221 _mesa_format_to_array(mesa_format, GLenum *type, int *num_components, 222 uint8_t swizzle[4], bool *normalized); 223 224 void 225 _mesa_swizzle_and_convert(void *dst, 226 enum mesa_array_format_datatype dst_type, 227 int num_dst_channels, 228 const void *src, 229 enum mesa_array_format_datatype src_type, 230 int num_src_channels, 231 const uint8_t swizzle[4], bool normalized, int count); 232 233 bool 234 _mesa_compute_rgba2base2rgba_component_mapping(GLenum baseFormat, uint8_t *map); 235 236 void 237 _mesa_format_convert(void *void_dst, uint32_t dst_format, size_t dst_stride, 238 void *void_src, uint32_t src_format, size_t src_stride, 239 size_t width, size_t height, uint8_t *rebase_swizzle); 240 241 #endif 242
Indexes created Sat Aug 01 00:24:56 UTC 2026