185 lines
4.9 KiB
C++
185 lines
4.9 KiB
C++
/*************************************************************************/
|
|
/* ring_buffer.h */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* http://www.godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */
|
|
/* */
|
|
/* 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, sublicense, 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 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 NONINFRINGEMENT.*/
|
|
/* 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. */
|
|
/*************************************************************************/
|
|
#ifndef RINGBUFFER_H
|
|
#define RINGBUFFER_H
|
|
|
|
#include "vector.h"
|
|
|
|
template <typename T>
|
|
class RingBuffer {
|
|
|
|
Vector<T> data;
|
|
int read_pos;
|
|
int write_pos;
|
|
int size_mask;
|
|
|
|
inline int inc(int& p_var, int p_size) {
|
|
int ret = p_var;
|
|
p_var += p_size;
|
|
p_var = p_var&size_mask;
|
|
return ret;
|
|
};
|
|
|
|
public:
|
|
|
|
T read() {
|
|
ERR_FAIL_COND_V(space_left() < 1, T());
|
|
return data[inc(read_pos, 1)];
|
|
};
|
|
|
|
int read(T* p_buf, int p_size, bool p_advance=true) {
|
|
int left = data_left();
|
|
p_size = MIN(left, p_size);
|
|
int pos = read_pos;
|
|
int to_read = p_size;
|
|
int dst = 0;
|
|
while(to_read) {
|
|
int end = pos + to_read;
|
|
end = MIN(end, size());
|
|
int total = end - pos;
|
|
for (int i=0; i<total; i++) {
|
|
p_buf[dst++] = data[pos + i];
|
|
};
|
|
to_read -= total;
|
|
pos = 0;
|
|
};
|
|
if (p_advance) {
|
|
inc(read_pos, p_size);
|
|
};
|
|
return p_size;
|
|
};
|
|
|
|
int copy(T* p_buf, int p_offset, int p_size) {
|
|
|
|
int left = data_left();
|
|
if ((p_offset+p_size)>left) {
|
|
p_size-=left-p_offset;
|
|
if (p_size<=0)
|
|
return 0;
|
|
}
|
|
p_size = MIN(left, p_size);
|
|
int pos = read_pos;
|
|
inc(pos,p_offset);
|
|
int to_read = p_size;
|
|
int dst = 0;
|
|
while(to_read) {
|
|
int end = pos + to_read;
|
|
end = MIN(end, size());
|
|
int total = end - pos;
|
|
for (int i=0; i<total; i++) {
|
|
p_buf[dst++] = data[pos + i];
|
|
};
|
|
to_read -= total;
|
|
pos = 0;
|
|
};
|
|
return p_size;
|
|
};
|
|
|
|
inline int advance_read(int p_n) {
|
|
p_n = MIN(p_n, data_left());
|
|
inc(read_pos, p_n);
|
|
return p_n;
|
|
};
|
|
|
|
Error write(const T& p_v) {
|
|
ERR_FAIL_COND_V( space_left() < 1, FAILED);
|
|
data[inc(write_pos, 1)] = p_v;
|
|
return OK;
|
|
};
|
|
|
|
int write(const T* p_buf, int p_size) {
|
|
|
|
int left = space_left();
|
|
p_size = MIN(left, p_size);
|
|
|
|
int pos = write_pos;
|
|
int to_write = p_size;
|
|
int src = 0;
|
|
while (to_write) {
|
|
|
|
int end = pos + to_write;
|
|
end = MIN(end, size());
|
|
int total = end - pos;
|
|
|
|
for (int i=0; i<total; i++) {
|
|
data[pos+i] = p_buf[src++];
|
|
};
|
|
to_write -= total;
|
|
pos = 0;
|
|
};
|
|
|
|
inc(write_pos, p_size);
|
|
return p_size;
|
|
};
|
|
|
|
inline int space_left() {
|
|
int left = read_pos - write_pos;
|
|
if (left < 0) {
|
|
return size() + left - 1;
|
|
};
|
|
if (left == 0) {
|
|
return size()-1;
|
|
};
|
|
return left -1;
|
|
};
|
|
inline int data_left() {
|
|
return size() - space_left() - 1;
|
|
};
|
|
|
|
inline int size() {
|
|
return data.size();
|
|
};
|
|
|
|
void resize(int p_power) {
|
|
int old_size = size();
|
|
int new_size = 1<<p_power;
|
|
int mask = new_size - 1;
|
|
data.resize(1<<p_power);
|
|
if (old_size < new_size && read_pos > write_pos) {
|
|
for (int i=0; i<write_pos; i++) {
|
|
data[(old_size + i)&mask] = data[i];
|
|
};
|
|
write_pos = (old_size + write_pos) & mask;
|
|
} else {
|
|
read_pos = read_pos & mask;
|
|
write_pos = write_pos & mask;
|
|
};
|
|
|
|
size_mask = mask;
|
|
};
|
|
|
|
RingBuffer<T>(int p_power=0) {
|
|
read_pos = 0;
|
|
write_pos = 0;
|
|
resize(p_power);
|
|
};
|
|
~RingBuffer<T>() {};
|
|
};
|
|
|
|
#endif
|