/*
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* Copyright (c) 2012-2015 Etnaviv Project
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/* Misc util */
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#ifndef H_ETNA_UTIL
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#define H_ETNA_UTIL
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#include <math.h>
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/* for conditionally setting boolean flag(s): */
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#define COND(bool, val) ((bool) ? (val) : 0)
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/* align to a value divisable by granularity >= value, works only for powers of two */
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static inline uint32_t
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etna_align_up(uint32_t value, uint32_t granularity)
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{
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return (value + (granularity - 1)) & (~(granularity - 1));
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}
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static inline uint32_t
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etna_bits_ones(unsigned num)
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{
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return (1 << num) - 1;
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}
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/* clamped float [0.0 .. 1.0] -> [0 .. 255] */
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static inline uint8_t
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etna_cfloat_to_uint8(float f)
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{
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if (f <= 0.0f)
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return 0;
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if (f >= (1.0f - 1.0f / 256.0f))
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return 255;
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return f * 256.0f;
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}
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/* clamped float [0.0 .. 1.0] -> [0 .. (1<<bits)-1] */
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static inline uint32_t
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etna_cfloat_to_uintN(float f, int bits)
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{
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if (f <= 0.0f)
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return 0;
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if (f >= (1.0f - 1.0f / (1 << bits)))
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return (1 << bits) - 1;
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return f * (1 << bits);
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}
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/* 1/log10(2) */
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#define RCPLOG2 (1.4426950408889634f)
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/* float to fixp 5.5 */
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static inline uint32_t
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etna_float_to_fixp55(float f)
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{
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if (f >= 15.953125f)
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return 511;
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if (f < -16.0f)
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return 512;
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return (int32_t)(f * 32.0f + 0.5f);
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}
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/* texture size to log2 in fixp 5.5 format */
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static inline uint32_t
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etna_log2_fixp55(unsigned width)
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{
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return etna_float_to_fixp55(logf((float)width) * RCPLOG2);
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}
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/* float to fixp 16.16 */
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static inline uint32_t
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etna_f32_to_fixp16(float f)
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{
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if (f >= (32768.0f - 1.0f / 65536.0f))
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return 0x7fffffff;
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if (f < -32768.0f)
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return 0x80000000;
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return (int32_t)(f * 65536.0f + 0.5f);
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}
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#endif
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