File content as of revision 8:5a0d849087f5:

#include "Pokitto.h"

Pokitto::Core mygame;


// snow flake data
const byte PROGMEM frames[60]={
4,8,12,16,12,8,4,0,
24,20,24,28,32,36,32,28,
56,52,48,44,40,44,48,52,
44,48,52,56,52,48,44,40,
64,68,72,76,80,76,72,68,
64,60,76,80,76,72,68,64,
60,64,68,72,96,100,96,92,
88,84,88,92};
const byte PROGMEM flkimage[104] ={
192,224,96,0,0,96,112,48,
0,0,60,24,0,6,14,12,
3,7,6,0,128,192,64,0,
0,64,96,32,0,0,24,24,
0,2,6,4,1,3,2,0,
192,128,0,0,0,192,64,0,
0,0,48,0,0,12,8,0,
12,4,0,0,128,128,0,0,
0,128,64,0,0,0,96,0,
0,0,48,0,0,16,32,0,
16,16,0,0,128,0,0,0,
0,128,0,0,0,0,64,0,
0,32,0,0,32,0,0,0,
};
int offset[18]={
1,0,8,3,3,6,6,6,
6,6,5,5,5,4,0,0,
1,3};
unsigned char mx[18]={
7,7,9,7,7,9,7,7,
9,7,7,9,7,9,7,7,
7,7};
unsigned char fptrs[18]={
8,16,32,52,24,42,16,8,
42,24,52,32,16,32,8,8,
0,0};
unsigned char vert[18]={
168,24,144,160,16,88,128,120,
40,8,56,176,104,56,80,152,
152,96};
unsigned char countdn[18]={
0,5,1,5,2,2,4,3,
2,1,6,5,5,3,2,2,
1,0};
unsigned char spead[18]={
4,4,4,4,4,4,4,5,
5,5,5,5,5,3,3,3,
2,1};
unsigned char tempimg[72]={
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0}; 

int numCols = mygame.display.width/8;
int maxHeight = mygame.display.height;

unsigned char rowStart[27]; // max width in 8x8 tiles
unsigned char snowRow[176]; // max height

void updateSnow(){
// Main snow-feild code
//unsigned char ctr=0;
unsigned char stp = 1;
for(int loop=17; loop>stp+7; loop-=stp){ // 17
countdn[loop]--;
if(countdn[loop]==0){
    countdn[loop]=spead[loop];
    //remove old flake image
    int y = vert[loop];
    int a=0;
    for(a=0; a<4; a++){
        snowRow[y] &= (255-tempimg[loop*4+a]);
        y++; if(y>=maxHeight){y=0;} // was 176
    }//a

    // rem calculate new vertical position
    // rem (vert) & frame number (offset)
    vert[loop]++;
    if(vert[loop]>=maxHeight){vert[loop]=0;}
    offset[loop]--;
    if(offset[loop]<0){offset[loop]=mx[loop];}
        // rem get next frame of animation
        y=pgm_read_byte(&frames[fptrs[loop]+offset[loop]]);
        for(a=0; a<4; a++){
          tempimg[loop*4+a]=pgm_read_byte(&flkimage[y+a]);
        }
        // rem add new frame at new position
    y=vert[loop];
    for(a=0; a<4; a++){
      snowRow[y] |= tempimg[loop*4+a];
      y++; if(y>=maxHeight){y=0;}
    }
    
  } // countdn
   }// loop   
  for(char x=0; x<numCols; x++){
    for(char y=0; y<maxHeight; y++){
      char p = rowStart[x]+y;
      if(p>=maxHeight){p-=maxHeight;}
      for(char t=0; t<7; t++){
        char col = 0;
        if(snowRow[p] & (1<<t)) col=1;
        mygame.display.drawPixel(t+(x*8),y,col);
      }
    }
  }
}


int main () {
    
    for(char t=0; t<18; t++){
        vert[t]=random(maxHeight>>1);
        if(t%1==0){vert[t]<<=1;}
    }
    for(char t=0; t<numCols; t++){
        rowStart[t]=(random(maxHeight>>1));
        if(t%1==0){rowStart[t]<<=1;}
    }    
    
    mygame.begin();
    while (mygame.isRunning()) {
        if (mygame.update()) {
            updateSnow();
            } 
        }    
    
}