borgware-2d/animations/gameoflife.c

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/**
* Conways Game of life
* Author: Daniel Otte
* License: GPLv3
*
*
*/
#include <stdint.h>
#ifdef AVR
#include <util/delay.h>
#include <avr/sfr_defs.h> /* for debugging */
#endif
#include "../config.h"
#include "../random/prng.h"
#include "../pixel.h"
#include "../util.h"
/******************************************************************************/
#undef DEBUG
#define XSIZE UNUM_COLS
#define YSIZE UNUM_ROWS
// optimizing for 8 bit archs while retaining compatibility with dimensions >127
#if UNUM_COLS < 128 && UNUM_ROWS < 128
typedef uint8_t coord_t;
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#else
typedef unsigned int coord_t;
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#endif
/*
* last line is for debug information
*/
#ifdef DEBUG
#undef YSIZE
#define YSIZE (UNUM_ROWS-1)
#define DEBUG_ROW (UNUM_ROWS-1)
#define DEBUG_BIT(pos, val) \
setpixel((pixel){(pos) % XSIZE,DEBUG_ROW + (pos) / XSIZE}, (val) ? 3 : 0)
#define DEBUG_BYTE(s,v) \
DEBUG_BIT((s)*8+0, (v)&(1<<0)); \
DEBUG_BIT((s)*8+1, (v)&(1<<1)); \
DEBUG_BIT((s)*8+2, (v)&(1<<2)); \
DEBUG_BIT((s)*8+3, (v)&(1<<3)); \
DEBUG_BIT((s)*8+4, (v)&(1<<4)); \
DEBUG_BIT((s)*8+5, (v)&(1<<5)); \
DEBUG_BIT((s)*8+6, (v)&(1<<6)); \
DEBUG_BIT((s)*8+7, (v)&(1<<7))
#else
#define DEBUG_BIT(s,v)
#define DEBUG_BYTE(s,v)
#endif
//#define GLIDER_TEST
#define BITSTUFFED
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#define LOOP_DETECT_BUFFER_SIZE 8U
#ifndef GOL_DELAY
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#define GOL_DELAY 100 /* milliseconds */
#endif
#ifndef GOL_CYCLES
#define GOL_CYCLES (2*60*3)
#endif
/******************************************************************************/
/******************************************************************************/
enum cell_e {
dead = 0, alive = 1
};
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#ifdef NDEBUG
typedef uint8_t cell_t;
#else
typedef enum cell_e cell_t;
#endif
#ifndef BITSTUFFED
#define FIELD_XSIZE XSIZE
#define FIELD_YSIZE YSIZE
typedef cell_t field_t[FIELD_YSIZE][FIELD_XSIZE];
/******************************************************************************/
void setcell(field_t pf, coord_t x, coord_t y, cell_t value) {
pf[(y+FIELD_YSIZE) % FIELD_YSIZE][(x+FIELD_XSIZE) % FIELD_XSIZE] = value;
}
/******************************************************************************/
cell_t getcell(field_t pf, coord_t x, coord_t y) {
return pf[(y+FIELD_YSIZE) % FIELD_YSIZE][(x+FIELD_XSIZE) % FIELD_XSIZE];
}
#else /* BITSTUFFED */
#define FIELD_XSIZE LINEBYTES
#define FIELD_YSIZE YSIZE
typedef uint8_t field_t[FIELD_YSIZE][FIELD_XSIZE];
/******************************************************************************/
static void setcell(field_t pf, coord_t x, coord_t y, cell_t value) {
if (value != dead) {
pf[y][x / 8] |= shl_table[x & 7];
} else {
pf[y][x / 8] &= ~shl_table[x & 7];
}
}
/******************************************************************************/
static cell_t getcell(field_t pf, coord_t x, coord_t y) {
return ((pf[y][x / 8]) & (shl_table[x & 7])) ? alive : dead;
}
#endif
/******************************************************************************/
uint8_t countsurroundingalive(field_t pf, coord_t x, coord_t y) {
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static int8_t const offset[] = {-1, -1, 0, +1, +1, +1, 0, -1, -1, -1};
x += XSIZE;
y += YSIZE;
uint8_t i, ret = 0;
for (i = 8; i--;) {
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// getcell(...) returns either 0 or 1
ret += getcell(pf, (x + offset[i+2]) % XSIZE, (y + offset[i]) % YSIZE);
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}
return ret;
}
/******************************************************************************/
void nextiteration(field_t dest, field_t src) {
coord_t x, y;
uint8_t tc;
for (y = YSIZE; y--;) {
for (x = XSIZE; x--;) {
cell_t cell;
tc = countsurroundingalive(src, x, y);
switch (tc) {
case 2:
/* keep */
continue;
break;
case 3:
/* alive */
cell = alive;
break;
default:
/* dead */
cell = dead;
break;
}
setcell(dest, x, y, cell);
}
}
}
/******************************************************************************/
#ifdef BITSTUFFED
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void pfprint(field_t pf) {
for (uint8_t i = NUMPLANE; i--;) {
memcpy(pixmap[i], pf, sizeof(field_t));
}
}
#else
void pfprint(field_t pf) {
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coord_t x,y;
for(y=YSIZE; y--;) {
for(x=XSIZE; x--;) {
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setpixel((pixel){x,y},getcell(pf,x,y)*3);
}
}
}
#endif
/******************************************************************************/
static void pfcopy(field_t dest, field_t src) {
memcpy(dest, src, sizeof(field_t));
}
/******************************************************************************/
static int pfcmp(field_t dest, field_t src) {
return memcmp(dest, src, sizeof(field_t));
}
#ifndef BITSTUFFED
/******************************************************************************/
uint8_t pfempty(field_t src) {
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coord_t x,y;
for(y=YSIZE; y--;) {
for(x=XSIZE; x--;) {
if (getcell(src, x, y)==alive)
return 0;
}
}
return 1;
}
#else
/******************************************************************************/
uint8_t pfempty(field_t src) {
coord_t x, y;
for (y = 0; y < FIELD_YSIZE; ++y) {
for (x = 0; x < FIELD_XSIZE; ++x) {
if (src[y][x] != 0)
return 0;
}
}
return 1;
}
#endif
/******************************************************************************/
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static void insertglider(field_t pf) {
#ifndef BITSTUFFED
/*
* #
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* #
* ###
*/
setcell(pf, 1, 0, alive);
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setcell(pf, 2, 1, alive);
setcell(pf, 0, 2, alive);setcell(pf, 1, 2, alive);setcell(pf, 2, 2, alive);
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#else
pf[0][0] |= 0x02; // #
pf[1][0] |= 0x04; // #
pf[2][0] |= 0x07; // ###
#endif
}
/******************************************************************************/
static void pfinit(field_t pf)
{
coord_t x, y;
#ifndef BITSTUFFED
for (y = YSIZE; y--;) {
for (x = XSIZE; x--;) {
setcell(pf, x, y, (random8() & 1) ? alive : dead);
}
}
#else
for (y = 0; y < FIELD_YSIZE; ++y) {
for (x = 0; x < FIELD_XSIZE; ++x) {
pf[y][x] = random8();
}
}
#endif
}
/******************************************************************************/
void gameoflife() {
DEBUG_BYTE(0,0); // set debug bytes to zero
DEBUG_BYTE(1,0);
field_t pf1, pf2;
field_t ldbuf[LOOP_DETECT_BUFFER_SIZE] = {{{0}}}; // loop detect buffer
uint8_t ldbuf_idx = 0;
uint16_t cycle;
#ifdef GLIDER_TEST
/* initialize with glider */
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coord_t x,y;
for(y = YSIZE; y--;) {
for(x = XSIZE; x--;) {
setcell(pf1, x, y, dead);
}
}
insertglider(pf1);
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#else
/* initialize the field with random */
pfinit(pf1);
#endif
/* the main part */
pfprint(pf1);
for (cycle = 1; cycle < GOL_CYCLES; ++cycle) {
DEBUG_BYTE(0, (uint8_t)(GOL_CYCLES-cycle) & 0xff); DEBUG_BYTE(1, SREG);
wait(GOL_DELAY);
pfcopy(pf2, pf1);
nextiteration(pf1, pf2);
pfprint(pf1);
/* loop detection */
if (!pfcmp(pf1, pf2)) {
insertglider(pf1);
cycle = 1;
}
if (pfempty(pf1)) {
/* kill game */
return;
}
/* */
uint8_t i;
for (i = 0; i < LOOP_DETECT_BUFFER_SIZE; ++i) {
if (!pfcmp(pf1, ldbuf[i])) {
insertglider(pf1);
cycle = 1;
}
}
pfcopy(ldbuf[ldbuf_idx], pf1);
ldbuf_idx = (ldbuf_idx + 1) % LOOP_DETECT_BUFFER_SIZE;
}
}