src/mesa/main/format_utils.h

   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
  37 extern const mesa_array_format RGBA8888_FLOAT;
  38 extern const mesa_array_format RGBA8888_UBYTE;
  39 extern const mesa_array_format RGBA8888_UINT;
  40 extern const mesa_array_format RGBA8888_INT;
  41
  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))))
  46
  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))
  51
  52 static inline float
  53 _mesa_unorm_to_float(unsigned x, unsigned src_bits)
  54 {
  55    return x * (1.0f / (float)MAX_UINT(src_bits));
  56 }
  57
  58 static inline float
  59 _mesa_snorm_to_float(int x, unsigned src_bits)
  60 {
  61    if (x <= -MAX_INT(src_bits))
  62       return -1.0f;
  63    else
  64       return x * (1.0f / (float)MAX_INT(src_bits));
  65 }
  66
  67 static inline uint16_t
  68 _mesa_unorm_to_half(unsigned x, unsigned src_bits)
  69 {
  70    return _mesa_float_to_half(_mesa_unorm_to_float(x, src_bits));
  71 }
  72
  73 static inline uint16_t
  74 _mesa_snorm_to_half(int x, unsigned src_bits)
  75 {
  76    return _mesa_float_to_half(_mesa_snorm_to_float(x, src_bits));
  77 }
  78
  79 static inline unsigned
  80 _mesa_float_to_unorm(float x, unsigned dst_bits)
  81 {
  82    if (x < 0.0f)
  83       return 0;
  84    else if (x > 1.0f)
  85       return MAX_UINT(dst_bits);
  86    else
  87       return F_TO_I(x * MAX_UINT(dst_bits));
  88 }
  89
  90 static inline unsigned
  91 _mesa_half_to_unorm(uint16_t x, unsigned dst_bits)
  92 {
  93    return _mesa_float_to_unorm(_mesa_half_to_float(x), dst_bits);
  94 }
  95
  96 static inline unsigned
  97 _mesa_unorm_to_unorm(unsigned x, unsigned src_bits, unsigned dst_bits)
  98 {
  99    if (src_bits < dst_bits)
 100       return EXTEND_NORMALIZED_INT(x, src_bits, dst_bits);
 101    else
 102       return x >> (src_bits - dst_bits);
 103 }
 104
 105 static inline unsigned
 106 _mesa_snorm_to_unorm(int x, unsigned src_bits, unsigned dst_bits)
 107 {
 108    if (x < 0)
 109       return 0;
 110    else
 111       return _mesa_unorm_to_unorm(x, src_bits - 1, dst_bits);
 112 }
 113
 114 static inline int
 115 _mesa_float_to_snorm(float x, unsigned dst_bits)
 116 {
 117    if (x < -1.0f)
 118       return -MAX_INT(dst_bits);
 119    else if (x > 1.0f)
 120       return MAX_INT(dst_bits);
 121    else
 122       return F_TO_I(x * MAX_INT(dst_bits));
 123 }
 124
 125 static inline int
 126 _mesa_half_to_snorm(uint16_t x, unsigned dst_bits)
 127 {
 128    return _mesa_float_to_snorm(_mesa_half_to_float(x), dst_bits);
 129 }
 130
 131 static inline int
 132 _mesa_unorm_to_snorm(unsigned x, unsigned src_bits, unsigned dst_bits)
 133 {
 134    return _mesa_unorm_to_unorm(x, src_bits, dst_bits - 1);
 135 }
 136
 137 static inline int
 138 _mesa_snorm_to_snorm(int x, unsigned src_bits, unsigned dst_bits)
 139 {
 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);
 144    else
 145       return x >> (src_bits - dst_bits);
 146 }
 147
 148 static inline unsigned
 149 _mesa_unsigned_to_unsigned(unsigned src, unsigned dst_size)
 150 {
 151    return MIN2(src, MAX_UINT(dst_size));
 152 }
 153
 154 static inline int
 155 _mesa_unsigned_to_signed(unsigned src, unsigned dst_size)
 156 {
 157    return MIN2(src, MAX_INT(dst_size));
 158 }
 159
 160 static inline int
 161 _mesa_signed_to_signed(int src, unsigned dst_size)
 162 {
 163    return CLAMP(src, MIN_INT(dst_size), MAX_INT(dst_size));
 164 }
 165
 166 static inline unsigned
 167 _mesa_signed_to_unsigned(int src, unsigned dst_size)
 168 {
 169    return CLAMP(src, 0, MAX_UINT(dst_size));
 170 }
 171
 172 static inline unsigned
 173 _mesa_float_to_unsigned(float src, unsigned dst_bits)
 174 {
 175    if (src < 0.0f)
 176       return 0;
 177    if (src > (float)MAX_UINT(dst_bits))
 178        return MAX_UINT(dst_bits);
 179    return _mesa_signed_to_unsigned(src, dst_bits);
 180 }
 181
 182 static inline unsigned
 183 _mesa_float_to_signed(float src, unsigned dst_bits)
 184 {
 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);
 190 }
 191
 192 static inline unsigned
 193 _mesa_half_to_unsigned(uint16_t src, unsigned dst_bits)
 194 {
 195    if (_mesa_half_is_negative(src))
 196       return 0;
 197    return _mesa_unsigned_to_unsigned(_mesa_float_to_half(src), dst_bits);
 198 }
 199
 200 static inline unsigned
 201 _mesa_half_to_signed(uint16_t src, unsigned dst_bits)
 202 {
 203    return _mesa_float_to_signed(_mesa_half_to_float(src), dst_bits);
 204 }
 205
 206 bool
 207 _mesa_format_to_array(mesa_format, GLenum *type, int *num_components,
 208                       uint8_t swizzle[4], bool *normalized);
 209
 210 void
 211 _mesa_swizzle_and_convert(void *dst, GLenum dst_type, int num_dst_channels,
 212                           const void *src, GLenum src_type, int num_src_channels,
 213                           const uint8_t swizzle[4], bool normalized, int count);
 214
 215 void
 216 _mesa_format_convert(void *void_dst, uint32_t dst_format, size_t dst_stride,
 217                      void *void_src, uint32_t src_format, size_t src_stride,
 218                      size_t width, size_t height, uint8_t *rebase_swizzle);
 219
 220 #endif