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 */
34static inline uint32_t
35etna_align_up(uint32_t value, uint32_t granularity)
36{
37   return (value + (granularity - 1)) & (~(granularity - 1));
38}
39
40/* clamped float [0.0 .. 1.0] -> [0 .. 255] */
41static inline uint8_t
42etna_cfloat_to_uint8(float f)
43{
44   if (f <= 0.0f)
45      return 0;
46
47   if (f >= (1.0f - 1.0f / 256.0f))
48      return 255;
49
50   return f * 256.0f;
51}
52
53/* clamped float [0.0 .. 1.0] -> [0 .. (1<<bits)-1] */
54static inline uint32_t
55etna_cfloat_to_uintN(float f, int bits)
56{
57   if (f <= 0.0f)
58      return 0;
59
60   if (f >= (1.0f - 1.0f / (1 << bits)))
61      return (1 << bits) - 1;
62
63   return f * (1 << bits);
64}
65
66/* 1/log10(2) */
67#define RCPLOG2 (1.4426950408889634f)
68
69/* float to fixp 5.5 */
70static inline uint32_t
71etna_float_to_fixp55(float f)
72{
73   if (f >= 15.953125f)
74      return 511;
75
76   if (f < -16.0f)
77      return 512;
78
79   return (int32_t)(f * 32.0f + 0.5f);
80}
81
82/* float to fixp 8.8 */
83static inline uint32_t
84etna_float_to_fixp88(float f)
85{
86   if (f >= (32767.0 - 1.0f) / 256.0f)
87      return 32767;
88
89   if (f < -16.0f)
90      return 32768;
91
92   return (int32_t)(f * 256.0f + 0.5f);
93}
94
95/* texture size to log2 in fixp 5.5 format */
96static inline uint32_t
97etna_log2_fixp55(unsigned width)
98{
99   return etna_float_to_fixp55(logf((float)width) * RCPLOG2);
100}
101
102/* texture size to log2 in fixp 8.8 format */
103static inline uint32_t
104etna_log2_fixp88(unsigned width)
105{
106   return etna_float_to_fixp88(logf((float)width) * RCPLOG2);
107}
108
109/* float to fixp 16.16 */
110static inline uint32_t
111etna_f32_to_fixp16(float f)
112{
113   if (f >= (32768.0f - 1.0f / 65536.0f))
114      return 0x7fffffff;
115
116   if (f < -32768.0f)
117      return 0x80000000;
118
119   return (int32_t)(f * 65536.0f + 0.5f);
120}
121
122#endif
123