src/gallium/drivers/etnaviv/etnaviv_util.h

   1 /*
   2  * Copyright (c) 2012-2015 Etnaviv Project
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /* Misc util */
  25 #ifndef H_ETNA_UTIL
  26 #define H_ETNA_UTIL
  27
  28 #include <math.h>
  29
  30 /* for conditionally setting boolean flag(s): */
  31 #define COND(bool, val) ((bool) ? (val) : 0)
  32
  33 #define foreach_bit(b, mask) \
  34    for (uint32_t _m = (mask); _m && ({(b) = u_bit_scan(&_m); 1;});)
  35
  36 /* align to a value divisable by granularity >= value, works only for powers of two */
  37 static inline uint32_t
  38 etna_align_up(uint32_t value, uint32_t granularity)
  39 {
  40    return (value + (granularity - 1)) & (~(granularity - 1));
  41 }
  42
  43 /* clamped float [0.0 .. 1.0] -> [0 .. 255] */
  44 static inline uint8_t
  45 etna_cfloat_to_uint8(float f)
  46 {
  47    if (f <= 0.0f)
  48       return 0;
  49
  50    if (f >= (1.0f - 1.0f / 256.0f))
  51       return 255;
  52
  53    return f * 256.0f;
  54 }
  55
  56 /* clamped float [0.0 .. 1.0] -> [0 .. (1<<bits)-1] */
  57 static inline uint32_t
  58 etna_cfloat_to_uintN(float f, int bits)
  59 {
  60    if (f <= 0.0f)
  61       return 0;
  62
  63    if (f >= (1.0f - 1.0f / (1 << bits)))
  64       return (1 << bits) - 1;
  65
  66    return f * (1 << bits);
  67 }
  68
  69 /* 1/log10(2) */
  70 #define RCPLOG2 (1.4426950408889634f)
  71
  72 /* float to fixp 5.5 */
  73 static inline uint32_t
  74 etna_float_to_fixp55(float f)
  75 {
  76    if (f >= 15.953125f)
  77       return 511;
  78
  79    if (f < -16.0f)
  80       return 512;
  81
  82    return (int32_t)(f * 32.0f + 0.5f);
  83 }
  84
  85 /* float to fixp 8.8 */
  86 static inline uint32_t
  87 etna_float_to_fixp88(float f)
  88 {
  89    if (f >= (32767.0 - 1.0f) / 256.0f)
  90       return 32767;
  91
  92    if (f < -16.0f)
  93       return 32768;
  94
  95    return (int32_t)(f * 256.0f + 0.5f);
  96 }
  97
  98 /* texture size to log2 in fixp 5.5 format */
  99 static inline uint32_t
 100 etna_log2_fixp55(unsigned width)
 101 {
 102    return etna_float_to_fixp55(logf((float)width) * RCPLOG2);
 103 }
 104
 105 /* texture size to log2 in fixp 8.8 format */
 106 static inline uint32_t
 107 etna_log2_fixp88(unsigned width)
 108 {
 109    return etna_float_to_fixp88(logf((float)width) * RCPLOG2);
 110 }
 111
 112 /* float to fixp 16.16 */
 113 static inline uint32_t
 114 etna_f32_to_fixp16(float f)
 115 {
 116    if (f >= (32768.0f - 1.0f / 65536.0f))
 117       return 0x7fffffff;
 118
 119    if (f < -32768.0f)
 120       return 0x80000000;
 121
 122    return (int32_t)(f * 65536.0f + 0.5f);
 123 }
 124
 125 #endif