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      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
    109