You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
2.9 KiB
C++
70 lines
2.9 KiB
C++
/* Python-rgbcx Texture Compression Library
|
|
Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
|
|
Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
|
|
and licenced under the public domain
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Affero General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Affero General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Affero General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
#include <cstdint>
|
|
|
|
static inline uint32_t iabs(int32_t i) { return (i < 0) ? static_cast<uint32_t>(-i) : static_cast<uint32_t>(i); }
|
|
static inline uint64_t iabs(int64_t i) { return (i < 0) ? static_cast<uint64_t>(-i) : static_cast<uint64_t>(i); }
|
|
|
|
static inline uint8_t scale8To5(uint32_t v) {
|
|
v = v * 31 + 128;
|
|
return (uint8_t)((v + (v >> 8)) >> 8);
|
|
}
|
|
static inline uint8_t scale8To6(uint32_t v) {
|
|
v = v * 63 + 128;
|
|
return (uint8_t)((v + (v >> 8)) >> 8);
|
|
}
|
|
|
|
static inline int scale5To8(int v) { return (v << 3) | (v >> 2); }
|
|
static inline int scale6To8(int v) { return (v << 2) | (v >> 4); }
|
|
|
|
template <typename S> inline S maximum(S a, S b) { return (a > b) ? a : b; }
|
|
template <typename S> inline S maximum(S a, S b, S c) { return maximum(maximum(a, b), c); }
|
|
template <typename S> inline S maximum(S a, S b, S c, S d) { return maximum(maximum(maximum(a, b), c), d); }
|
|
|
|
template <typename S> inline S minimum(S a, S b) { return (a < b) ? a : b; }
|
|
template <typename S> inline S minimum(S a, S b, S c) { return minimum(minimum(a, b), c); }
|
|
template <typename S> inline S minimum(S a, S b, S c, S d) { return minimum(minimum(minimum(a, b), c), d); }
|
|
|
|
template <typename T> inline T square(T a) { return a * a; }
|
|
|
|
static inline float clampf(float value, float low, float high) {
|
|
if (value < low)
|
|
value = low;
|
|
else if (value > high)
|
|
value = high;
|
|
return value;
|
|
}
|
|
static inline uint8_t clamp255(int32_t i) { return (uint8_t)((i & 0xFFFFFF00U) ? (~(i >> 31)) : i); }
|
|
|
|
template <typename S> inline S clamp(S value, S low, S high) { return (value < low) ? low : ((value > high) ? high : value); }
|
|
static inline int32_t clampi(int32_t value, int32_t low, int32_t high) {
|
|
if (value < low)
|
|
value = low;
|
|
else if (value > high)
|
|
value = high;
|
|
return value;
|
|
}
|
|
|
|
static inline int squarei(int a) { return a * a; }
|
|
static inline int absi(int a) { return (a < 0) ? -a : a; }
|
|
|
|
template <typename F> inline F lerp(F a, F b, F s) { return a + (b - a) * s; }
|