main.c

#define REG_DISPCTL *(unsigned short *)0x4000000
#define VIDEO_BUFFER ((unsigned short *)0x6000000)


/* Create a color with the specified RGB values */
#define COLOR(r, g, b) ((r) | (g)<<5 | (b)<<10)

/* Calculate the position of a pixel based on it's row and column */
#define OFFSET(R,C) ((R)*240+(C))

//Predefined colors
#define RED COLOR(31, 0, 0)
#define LIGHTGRAY COLOR(29,29,29)
#define GRAY COLOR(16,16,16)
#define GREEN COLOR(0, 31, 0)
#define BLUE COLOR(0, 0, 31)
#define LIGHTBLUE COLOR(16,16,31)
#define MAGENTA COLOR(31, 0, 31)
#define CYAN COLOR(0, 31, 31)
#define YELLOW COLOR(31, 31, 0)
#define BLACK 0
#define WHITE COLOR(31, 31, 31)

void setPixel(int, int, unsigned short);
void delay();
void updateBG(int);
void updateCharacter(int);
void drawCharacterAt(int,int,int);
unsigned short backgroundColor(int);
void drawRain(int,int);

int cx[48] = {3 ,4 ,5 ,6 ,7 ,8 ,9 ,9 ,10,11,12,12,13,14,15,16,17,17,18,19,19,19,19,19,38,37,36,35,34,33,32,32,31,30,29,29,28,27,26,25,24,24,23,22,22,22,22,22};
int cy[48] = {38,38,38,38,38,38,38,39,39,39,39,40,40,40,40,40,40,41,41,41,42,43,44,45,38,38,38,38,38,38,38,39,39,39,39,40,40,40,40,40,40,41,41,41,42,43,44,45};
unsigned short bg[272];

int main() {
    REG_DISPCTL = 1027;

    int i = 0;
    for(i = 0; i < 25200; i++)
    {
        VIDEO_BUFFER[i] = LIGHTBLUE;
    }
    for(i=25200;i<38400;i++)
    {
        VIDEO_BUFFER[i] = GRAY;
    }
    for(i=0;i<105;i++)
    {
        bg[i] = LIGHTBLUE;
    }
    for(i=105;i<272;i++)
    {
        bg[i] = GRAY;
    }

    int j = 0;
    while(1)
    {
        if(j%500==0)
        {
            for(i = 0; i < 25200; i++)
            {
                VIDEO_BUFFER[i] = LIGHTBLUE;
            }
            for(i=25200;i<38400;i++)
            {
                VIDEO_BUFFER[i] = GRAY;
            }
        }
        updateBG(j);

        if(j%8==0)
        {
            updateCharacter(j/8);
        }

        j++;
        delay();
    }
}

void updateBG(int i)
{
    drawRain(i,i+20   );
    drawRain(i+7,i+26 );
    drawRain(i,i+20   );
    drawRain(i+17,i   );
    drawRain(i+30,i+32);
    drawRain(i+17,i+60);
    drawRain(i+42,i+44);
    drawRain(i+11,i+46);
    drawRain(i+86,i+93);
    drawRain(i+88,i+77);
    drawRain(i+77,i+66);
    drawRain(i+66,i+55);
    drawRain(i+55,i+40);
    drawRain(i+2,i+3  );
    drawRain(i,i+20   );
    drawRain(i+7,i+26 );
    drawRain(i,i+20   );
    drawRain(i+17,i   );
    drawRain(i+30,i+32);
    drawRain(i+17,i+60);
    drawRain(i+42,i+44);
    drawRain(i+11,i+46);
    drawRain(i+86,i+93);
    drawRain(i+88,i+77);
    drawRain(i+77,i+66);
    drawRain(i+66,i+55);
    drawRain(i+55,i+40);
    drawRain(i+2,i+3  );

    // for(i = 80; i < 160; i++) {
    //     int j;
    //     for(j = 0; j < 240; j++)
    //     {
    //         setPixel(j,i,COLOR((i-70)/4,(i-70)/4,(i-70)/4));
    //     }
    // }
}

void drawRain(int x, int y)
{
    setPixel(x,y,LIGHTGRAY);
    setPixel(x-1,y-1,backgroundColor(y-1));

    setPixel(x*2,y*2,LIGHTGRAY);
    setPixel((x-1)*2,(y-1)*2,backgroundColor((y-1)*2));

    setPixel(x*3,y*3,LIGHTGRAY);
    setPixel((x-1)*3,(y-1)*3,backgroundColor((y-1)*3));

    setPixel((x+10)*2,(y+20)*2,LIGHTGRAY);
    setPixel((x+9)*2,(y+19)*2,backgroundColor((y+19)*2));

    setPixel((x-40)*3,(y-14)*3,LIGHTGRAY);
    setPixel((x-41)*3,(y-15)*3,backgroundColor((y-15)*3));
}

unsigned short backgroundColor(int col)
{
    return(bg[col%272]);
}

int characterposition = 0;
int up = 1;
void updateCharacter(int i)
{
    characterposition = i%6;
    if(up == 1)
    {
        int k;
        for(k=0;k<43;k++)
        {
            int j;
            for(j=0;j<48;j++)
            {
                setPixel(100+k,39+j,LIGHTBLUE);
            }
        }
        drawCharacterAt(100, 40 + characterposition, i);
        if(characterposition == 5)
        {
            up = 0;
        }
    }
    else
    {
        int k;
        for(k=0;k<43;k++)
        {
            int j;
            for(j=0;j<48;j++)
            {
                setPixel(100+k,46+j,LIGHTBLUE);
            }
        }
        drawCharacterAt(100, 45 - characterposition, i);
        if(characterposition == 5)
        {
            up = 1;
        }
    }
}

void drawCharacterAt(int x, int y, int t)
{
    int i;

    //head box
    for(i = 14; i < 28; i++)
    {
        int j;
        for(j = 0; j < 11; j++)
        {
            setPixel(x + i, y + j, COLOR(18,13,10));
        }
    }

    //eyes and arrow
    setPixel(x + 20, y,   COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 21, y,   COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 18, y+1, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 19, y+1, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 20, y+1, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 21, y+1, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 22, y+1, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 23, y+1, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 19, y+2, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 20, y+2, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 21, y+2, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 22, y+2, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 20, y+3, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 21, y+3, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 17, y+6, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 18, y+6, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 23, y+6, COLOR(10+t/2,31+t/2,29+t/2));
    setPixel(x + 24, y+6, COLOR(10+t/2,31+t/2,29+t/2));

    //mouth
    setPixel(x + 20, y+9, COLOR(14,10,8));
    setPixel(x + 21, y+9, COLOR(14,10,8));

    //shirt
    for(i = 11; i < 31; i++)
    {
        int j;
        for(j = 15; j < 23; j++)
        {
            setPixel(x + i, y + j, COLOR(28,23,13));
        }
    }
    for(i = 12; i < 30; i++)
    {
        setPixel(x + i, y + 23, COLOR(28,23,13));
    }
    for(i = 13; i < 29; i++)
    {
        int j;
        for(j = 24; j < 35; j++)
        {
            setPixel(x + i, y + j, COLOR(28,23,13));
        }
    }
    setPixel(x + 16, y + 14, COLOR(28,23,13));
    setPixel(x + 17, y + 14, COLOR(28,23,13));
    setPixel(x + 17, y + 13, COLOR(28,23,13));
    setPixel(x + 24, y + 13, COLOR(28,23,13));
    setPixel(x + 24, y + 14, COLOR(28,23,13));
    setPixel(x + 25, y + 14, COLOR(28,23,13));

    //neck
    for(i = 18; i < 24; i++)
    {
        int j;
        for(j = 11; j < 18; j++)
        {
            setPixel(x + i, y + j, COLOR(18,13,10));
        }
    }
    setPixel(x + 20, y + 18, COLOR(18,13,10));
    setPixel(x + 21, y + 18, COLOR(18,13,10));

    //right arm
    setPixel(x + 31, y + 15, COLOR(18,13,10));
    setPixel(x + 32, y + 15, COLOR(18,13,10));
    setPixel(x + 31, y + 16, COLOR(18,13,10));
    setPixel(x + 31, y + 17, COLOR(18,13,10));
    setPixel(x + 31, y + 18, COLOR(18,13,10));
    for(i = 32; i < 35; i++)
    {
        int j;
        for(j = 16; j < 30; j++)
        {
            setPixel(x + i, y + j, COLOR(18,13,10));
        }
    }
    for(i = 22; i < 32; i++)
    {
        int j;
        for(j = 27; j < 30; j++)
        {
            setPixel(x + i, y + j, COLOR(18,13,10));
        }
    }
    setPixel(x + 22, y + 24, COLOR(18,13,10));
    setPixel(x + 23, y + 24, COLOR(18,13,10));
    setPixel(x + 22, y + 25, COLOR(18,13,10));
    setPixel(x + 23, y + 25, COLOR(18,13,10));
    setPixel(x + 22, y + 26, COLOR(18,13,10));
    setPixel(x + 23, y + 26, COLOR(18,13,10));

    //left arm
    setPixel(x + 9, y + 15, COLOR(18,13,10));
    setPixel(x + 10, y + 15, COLOR(18,13,10));
    setPixel(x + 10, y + 16, COLOR(18,13,10));
    setPixel(x + 10, y + 17, COLOR(18,13,10));
    setPixel(x + 10, y + 18, COLOR(18,13,10));
    for(i = 7; i < 10; i++)
    {
        int j;
        for(j = 16; j < 30; j++)
        {
            setPixel(x + i, y + j, COLOR(18,13,10));
        }
    }
    for(i = 10; i < 20; i++)
    {
        int j;
        for(j = 27; j < 30; j++)
        {
            setPixel(x + i, y + j, COLOR(18,13,10));
        }
    }
    setPixel(x + 18, y + 24, COLOR(18,13,10));
    setPixel(x + 19, y + 24, COLOR(18,13,10));
    setPixel(x + 18, y + 25, COLOR(18,13,10));
    setPixel(x + 19, y + 25, COLOR(18,13,10));
    setPixel(x + 18, y + 26, COLOR(18,13,10));
    setPixel(x + 19, y + 26, COLOR(18,13,10));

    //legs
    for(i = 3; i < 39; i++)
    {
        int j;
        for(j = 35; j < 46; j++)
        {
            setPixel(x + i, y + j, COLOR(31,30,25));
        }
    }
    for(i = 1; i < 3; i++)
    {
        int j;
        for(j = 36; j < 45; j++)
        {
            setPixel(x + i, y + j, COLOR(31,30,25));
        }
    }
    for(i = 37; i < 43; i++)
    {
        setPixel(x, y + i, COLOR(31,30,25));
    }
    for(i = 39; i < 41; i++)
    {
        int j;
        for(j = 36; j < 45; j++)
        {
            setPixel(x + i, y + j, COLOR(31,30,25));
        }
    }
    for(i = 37; i < 43; i++)
    {
        setPixel(x + 41, y + i, COLOR(31,30,25));
    }

    //shading
    for(i=0;i<48;i++) {
        setPixel(x + cx[i], y + cy[i], COLOR(24,23,19));
    }

}

void setPixel(int row, int col, unsigned short color)
{
    VIDEO_BUFFER[OFFSET(col,row)] = color;
}

void delay() {
    int i;
    volatile int b;
    for(i=0;i<30000;i++) {
        b++;
    }
}