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 /* align to a value divisable by granularity >= value, works only for powers of two */
  34 static inline uint32_t
  35 etna_align_up(uint32_t value, uint32_t granularity)
  36 {
  37    return (value + (granularity - 1)) & (~(granularity - 1));
  38 }
  39
  40 static inline uint32_t
  41 etna_bits_ones(unsigned num)
  42 {
  43    return (1 << num) - 1;
  44 }
  45
  46 /* clamped float [0.0 .. 1.0] -> [0 .. 255] */
  47 static inline uint8_t
  48 etna_cfloat_to_uint8(float f)
  49 {
  50    if (f <= 0.0f)
  51       return 0;
  52
  53    if (f >= (1.0f - 1.0f / 256.0f))
  54       return 255;
  55
  56    return f * 256.0f;
  57 }
  58
  59 /* clamped float [0.0 .. 1.0] -> [0 .. (1<<bits)-1] */
  60 static inline uint32_t
  61 etna_cfloat_to_uintN(float f, int bits)
  62 {
  63    if (f <= 0.0f)
  64       return 0;
  65
  66    if (f >= (1.0f - 1.0f / (1 << bits)))
  67       return (1 << bits) - 1;
  68
  69    return f * (1 << bits);
  70 }
  71
  72 /* 1/log10(2) */
  73 #define RCPLOG2 (1.4426950408889634f)
  74
  75 /* float to fixp 5.5 */
  76 static inline uint32_t
  77 etna_float_to_fixp55(float f)
  78 {
  79    if (f >= 15.953125f)
  80       return 511;
  81
  82    if (f < -16.0f)
  83       return 512;
  84
  85    return (int32_t)(f * 32.0f + 0.5f);
  86 }
  87
  88 /* texture size to log2 in fixp 5.5 format */
  89 static inline uint32_t
  90 etna_log2_fixp55(unsigned width)
  91 {
  92    return etna_float_to_fixp55(logf((float)width) * RCPLOG2);
  93 }
  94
  95 /* float to fixp 16.16 */
  96 static inline uint32_t
  97 etna_f32_to_fixp16(float f)
  98 {
  99    if (f >= (32768.0f - 1.0f / 65536.0f))
 100       return 0x7fffffff;
 101
 102    if (f < -32768.0f)
 103       return 0x80000000;
 104
 105    return (int32_t)(f * 65536.0f + 0.5f);
 106 }
 107
 108 #endif