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/*
* Copyright (c) 2012-2015 Etnaviv Project
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/* Misc util */
#ifndef H_ETNA_UTIL
#define H_ETNA_UTIL
#include <math.h>
/* for conditionally setting boolean flag(s): */
#define COND(bool, val) ((bool) ? (val) : 0)
#define foreach_bit(b, mask) \
for (uint32_t _m = (mask); _m && ({(b) = u_bit_scan(&_m); 1;});)
/* align to a value divisable by granularity >= value, works only for powers of two */
static inline uint32_t
etna_align_up(uint32_t value, uint32_t granularity)
{
return (value + (granularity - 1)) & (~(granularity - 1));
}
/* clamped float [0.0 .. 1.0] -> [0 .. 255] */
static inline uint8_t
etna_cfloat_to_uint8(float f)
{
if (f <= 0.0f)
return 0;
if (f >= (1.0f - 1.0f / 256.0f))
return 255;
return f * 256.0f;
}
/* clamped float [0.0 .. 1.0] -> [0 .. (1<<bits)-1] */
static inline uint32_t
etna_cfloat_to_uintN(float f, int bits)
{
if (f <= 0.0f)
return 0;
if (f >= (1.0f - 1.0f / (1 << bits)))
return (1 << bits) - 1;
return f * (1 << bits);
}
/* 1/log10(2) */
#define RCPLOG2 (1.4426950408889634f)
/* float to fixp 5.5 */
static inline uint32_t
etna_float_to_fixp55(float f)
{
if (f >= 15.953125f)
return 511;
if (f < -16.0f)
return 512;
return (int32_t)(f * 32.0f + 0.5f);
}
/* float to fixp 8.8 */
static inline uint32_t
etna_float_to_fixp88(float f)
{
if (f >= (32767.0 - 1.0f) / 256.0f)
return 32767;
if (f < -16.0f)
return 32768;
return (int32_t)(f * 256.0f + 0.5f);
}
/* texture size to log2 in fixp 5.5 format */
static inline uint32_t
etna_log2_fixp55(unsigned width)
{
return etna_float_to_fixp55(logf((float)width) * RCPLOG2);
}
/* texture size to log2 in fixp 8.8 format */
static inline uint32_t
etna_log2_fixp88(unsigned width)
{
return etna_float_to_fixp88(logf((float)width) * RCPLOG2);
}
/* float to fixp 16.16 */
static inline uint32_t
etna_f32_to_fixp16(float f)
{
if (f >= (32768.0f - 1.0f / 65536.0f))
return 0x7fffffff;
if (f < -32768.0f)
return 0x80000000;
return (int32_t)(f * 65536.0f + 0.5f);
}
#endif
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