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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
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// optimizing for 8 bit archs while retaining compatibility with dimensions >255
#if UNUM_COLS < 128 && UNUM_ROWS < 128
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typedef uint8_t coord_t;
#else
typedef unsigned int coord_t;
#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
#define GOL_DELAY 1 /* milliseconds */
#endif
#ifndef GOL_CYCLES
#define GOL_CYCLES (2*60*3)
#endif
/******************************************************************************/
/******************************************************************************/
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enum cell_e {dead=0, alive=1};
#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_XSIZE][FIELD_YSIZE];
/******************************************************************************/
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void setcell(field_t pf, coord_t x, coord_t y, cell_t value){
pf[(x+FIELD_XSIZE)%FIELD_XSIZE][(y+FIELD_YSIZE)%FIELD_YSIZE] = value;
}
/******************************************************************************/
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cell_t getcell(field_t pf, coord_t x, coord_t y){
return pf[(x+FIELD_XSIZE)%FIELD_XSIZE][(y+FIELD_YSIZE)%FIELD_YSIZE];
}
#else /* BITSTUFFED */
#define FIELD_XSIZE ((XSIZE+7)/8)
#define FIELD_YSIZE YSIZE
typedef uint8_t field_t[FIELD_XSIZE][FIELD_YSIZE];
/******************************************************************************/
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void setcell(field_t pf, coord_t x, coord_t y, cell_t value){
uint8_t t;
t = pf[x/8][y];
if(value==alive){
t |= 1<<(x&7);
} else {
t &= ~(1<<(x&7));
}
pf[x/8][y] = t;
}
/******************************************************************************/
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static cell_t getcell(field_t pf, coord_t x, coord_t y){
return ((pf[x/8][y])&(1<<(x&7)))?alive:dead;
}
#endif
/******************************************************************************/
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uint8_t countsurroundingalive(field_t pf, coord_t x, coord_t y){
static int8_t const offset[] = {-1, -1, 0, +1, +1, +1, 0, -1, -1, -1};
x += XSIZE;
y += YSIZE;
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uint8_t i, ret=0;
for (i = 8; i--;)
{
// 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){
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coord_t x,y;
uint8_t tc;
for(y=0; y<YSIZE; ++y){
for(x=0; x<XSIZE; ++x){
tc=countsurroundingalive(src,x,y);
switch(tc){
// case 0:
// case 1:
// /* dead */
// setcell(dest, x,y, dead);
case 2:
/* keep */
setcell(dest, x,y, getcell(src,x,y));
break;
case 3:
/* alive */
setcell(dest, x,y, alive);
break;
default:
/* dead */
setcell(dest, x,y, dead);
break;
}
}
}
}
/******************************************************************************/
void printpf(field_t pf){
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coord_t x,y;
for(y=YSIZE; y--;){
for(x=XSIZE; x--;){
setpixel((pixel){x,y},getcell(pf,x,y)*3);
}
}
}
/******************************************************************************/
void pfcopy(field_t dest, field_t src){
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coord_t x,y;
for(y=YSIZE; y--;){
for(x=XSIZE; x--;){
setcell(dest,x,y,getcell(src,x,y));
}
}
}
/******************************************************************************/
#ifndef BITSTUFFED
uint8_t pfcmp(field_t dest, field_t src){
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coord_t x,y;
for(y=YSIZE; y--;){
for(x=XSIZE; x--;){
if (getcell(src,x,y) != getcell(dest,x,y))
return 1;
}
}
return 0;
}
/******************************************************************************/
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 pfcmp(field_t dest, field_t src){
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coord_t x,y;
for(y=0; y<FIELD_YSIZE; ++y){
for(x=0; x<FIELD_XSIZE; ++x){
if (src[x][y] != dest[x][y])
return 1;
}
}
return 0;
}
/******************************************************************************/
uint8_t pfempty(field_t src){
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coord_t x,y;
for(y=0; y<FIELD_YSIZE; ++y){
for(x=0; x<FIELD_XSIZE; ++x){
if (src[x][y]!=0)
return 0;
}
}
return 1;
}
#endif
/******************************************************************************/
void insertglider(field_t pf){
/*
* #
* #
* ###
*/
setcell(pf, 1, 0, alive);
setcell(pf, 2, 1, alive);
setcell(pf, 0, 2, alive); setcell(pf, 1, 2, alive); setcell(pf, 2, 2, alive);
}
/******************************************************************************/
int 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;
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coord_t x,y;
uint16_t cycle;
//start:
/* initalise the field with random */
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for(y=YSIZE; y--;){
for(x=XSIZE; x--;){
setcell(pf1,x,y,(random8()&1)?alive:dead);
}
}
#ifdef GLIDER_TEST
/* initialise with glider */
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for(y=YSIZE; y--;){
for(x=XSIZE; x--;){
setcell(pf1,x,y,dead);
}
}
insertglider(pf1);
#endif
/* the main part */
printpf(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);
printpf(pf1);
/* loop detection */
if(!pfcmp(pf1, pf2)){
insertglider(pf1);
cycle=1;
}
if(pfempty(pf1)){
/* kill game */
return 0;
}
/* */
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;
}
return 0;
}