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 "imports.h" 35 #include "macros.h" 36 #include "util/rounding.h" 37 #include "util/half_float.h" 38 39 extern const mesa_array_format RGBA32_FLOAT; 40 extern const mesa_array_format RGBA8_UBYTE; 41 extern const mesa_array_format RGBA32_UINT; 42 extern const mesa_array_format RGBA32_INT; 43 44 /* Only guaranteed to work for BITS <= 32 */ 45 #define MAX_UINT(BITS) ((BITS) == 32 ? UINT32_MAX : ((1u << (BITS)) - 1)) 46 #define MAX_INT(BITS) ((int)MAX_UINT((BITS) - 1)) 47 #define MIN_INT(BITS) ((BITS) == 32 ? INT32_MIN : (-(1 << (BITS - 1)))) 48 49 /* Extends an integer of size SRC_BITS to one of size DST_BITS linearly */ 50 #define EXTEND_NORMALIZED_INT(X, SRC_BITS, DST_BITS) \ 51 (((X) * (int)(MAX_UINT(DST_BITS) / MAX_UINT(SRC_BITS))) + \ 52 ((DST_BITS % SRC_BITS) ? ((X) >> (SRC_BITS - DST_BITS % SRC_BITS)) : 0)) 53 54 static inline float 55 _mesa_unorm_to_float(unsigned x, unsigned src_bits) 56 { 57 return x * (1.0f / (float)MAX_UINT(src_bits)); 58 } 59 60 static inline float 61 _mesa_snorm_to_float(int x, unsigned src_bits) 62 { 63 if (x <= -MAX_INT(src_bits)) 64 return -1.0f; 65 else 66 return x * (1.0f / (float)MAX_INT(src_bits)); 67 } 68 69 static inline uint16_t 70 _mesa_unorm_to_half(unsigned x, unsigned src_bits) 71 { 72 return _mesa_float_to_half(_mesa_unorm_to_float(x, src_bits)); 73 } 74 75 static inline uint16_t 76 _mesa_snorm_to_half(int x, unsigned src_bits) 77 { 78 return _mesa_float_to_half(_mesa_snorm_to_float(x, src_bits)); 79 } 80 81 static inline unsigned 82 _mesa_float_to_unorm(float x, unsigned dst_bits) 83 { 84 if (x < 0.0f) 85 return 0; 86 else if (x > 1.0f) 87 return MAX_UINT(dst_bits); 88 else 89 return _mesa_lroundevenf(x * MAX_UINT(dst_bits)); 90 } 91 92 static inline unsigned 93 _mesa_half_to_unorm(uint16_t x, unsigned dst_bits) 94 { 95 return _mesa_float_to_unorm(_mesa_half_to_float(x), dst_bits); 96 } 97 98 static inline unsigned 99 _mesa_unorm_to_unorm(unsigned x, unsigned src_bits, unsigned dst_bits) 100 { 101 if (src_bits < dst_bits) { 102 return EXTEND_NORMALIZED_INT(x, src_bits, dst_bits); 103 } else if (src_bits > dst_bits) { 104 unsigned src_half = (1 << (src_bits - 1)) - 1; 105 106 if (src_bits + dst_bits > sizeof(x) * 8) { 107 assert(src_bits + dst_bits <= sizeof(uint64_t) * 8); 108 return (((uint64_t) x * MAX_UINT(dst_bits) + src_half) / 109 MAX_UINT(src_bits)); 110 } else { 111 return (x * MAX_UINT(dst_bits) + src_half) / MAX_UINT(src_bits); 112 } 113 } else { 114 return x; 115 } 116 } 117 118 static inline unsigned 119 _mesa_snorm_to_unorm(int x, unsigned src_bits, unsigned dst_bits) 120 { 121 if (x < 0) 122 return 0; 123 else 124 return _mesa_unorm_to_unorm(x, src_bits - 1, dst_bits); 125 } 126 127 static inline int 128 _mesa_float_to_snorm(float x, unsigned dst_bits) 129 { 130 if (x < -1.0f) 131 return -MAX_INT(dst_bits); 132 else if (x > 1.0f) 133 return MAX_INT(dst_bits); 134 else 135 return _mesa_lroundevenf(x * MAX_INT(dst_bits)); 136 } 137 138 static inline int 139 _mesa_half_to_snorm(uint16_t x, unsigned dst_bits) 140 { 141 return _mesa_float_to_snorm(_mesa_half_to_float(x), dst_bits); 142 } 143 144 static inline int 145 _mesa_unorm_to_snorm(unsigned x, unsigned src_bits, unsigned dst_bits) 146 { 147 return _mesa_unorm_to_unorm(x, src_bits, dst_bits - 1); 148 } 149 150 static inline int 151 _mesa_snorm_to_snorm(int x, unsigned src_bits, unsigned dst_bits) 152 { 153 if (x < -MAX_INT(src_bits)) 154 return -MAX_INT(dst_bits); 155 else if (src_bits < dst_bits) 156 return EXTEND_NORMALIZED_INT(x, src_bits - 1, dst_bits - 1); 157 else 158 return x >> (src_bits - dst_bits); 159 } 160 161 static inline unsigned 162 _mesa_unsigned_to_unsigned(unsigned src, unsigned dst_size) 163 { 164 return MIN2(src, MAX_UINT(dst_size)); 165 } 166 167 static inline int 168 _mesa_unsigned_to_signed(unsigned src, unsigned dst_size) 169 { 170 return MIN2(src, (unsigned)MAX_INT(dst_size)); 171 } 172 173 static inline int 174 _mesa_signed_to_signed(int src, unsigned dst_size) 175 { 176 return CLAMP(src, MIN_INT(dst_size), MAX_INT(dst_size)); 177 } 178 179 static inline unsigned 180 _mesa_signed_to_unsigned(int src, unsigned dst_size) 181 { 182 return CLAMP(src, 0, MAX_UINT(dst_size)); 183 } 184 185 static inline unsigned 186 _mesa_float_to_unsigned(float src, unsigned dst_bits) 187 { 188 if (src < 0.0f) 189 return 0; 190 if (src > (float)MAX_UINT(dst_bits)) 191 return MAX_UINT(dst_bits); 192 return _mesa_signed_to_unsigned(src, dst_bits); 193 } 194 195 static inline unsigned 196 _mesa_float_to_signed(float src, unsigned dst_bits) 197 { 198 if (src < (float)(-MAX_INT(dst_bits))) 199 return -MAX_INT(dst_bits); 200 if (src > (float)MAX_INT(dst_bits)) 201 return MAX_INT(dst_bits); 202 return _mesa_signed_to_signed(src, dst_bits); 203 } 204 205 static inline unsigned 206 _mesa_half_to_unsigned(uint16_t src, unsigned dst_bits) 207 { 208 if (_mesa_half_is_negative(src)) 209 return 0; 210 return _mesa_unsigned_to_unsigned(_mesa_float_to_half(src), dst_bits); 211 } 212 213 static inline unsigned 214 _mesa_half_to_signed(uint16_t src, unsigned dst_bits) 215 { 216 return _mesa_float_to_signed(_mesa_half_to_float(src), dst_bits); 217 } 218 219 bool 220 _mesa_format_to_array(mesa_format, GLenum *type, int *num_components, 221 uint8_t swizzle[4], bool *normalized); 222 223 void 224 _mesa_swizzle_and_convert(void *dst, 225 enum mesa_array_format_datatype dst_type, 226 int num_dst_channels, 227 const void *src, 228 enum mesa_array_format_datatype src_type, 229 int num_src_channels, 230 const uint8_t swizzle[4], bool normalized, int count); 231 232 bool 233 _mesa_compute_rgba2base2rgba_component_mapping(GLenum baseFormat, uint8_t *map); 234 235 void 236 _mesa_format_convert(void *void_dst, uint32_t dst_format, size_t dst_stride, 237 void *void_src, uint32_t src_format, size_t src_stride, 238 size_t width, size_t height, uint8_t *rebase_swizzle); 239 240 #endif 241
