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