1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/Makefile	Mon Feb 17 10:17:17 2014 +0200
     1.3 @@ -0,0 +1,16 @@
     1.4 +src = test.c
     1.5 +obj = $(src:.c=.o)
     1.6 +
     1.7 +bin = test.tap
     1.8 +
     1.9 +CC = zcc
    1.10 +CFLAGS = +zx -pragma-define=myzorg=28000
    1.11 +LDFLAGS = -create-app
    1.12 +
    1.13 +$(bin): $(obj)
    1.14 +	rm -f $(bin)
    1.15 +	$(CC) $(CFLAGS) -o $@ $(LDFLAGS) $(obj)
    1.16 +
    1.17 +.PHONY: clean
    1.18 +clean:
    1.19 +	rm -f $(obj) $(bin)

     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/RUN	Mon Feb 17 10:17:17 2014 +0200
     2.3 @@ -0,0 +1,3 @@
     2.4 +#!/bin/sh
     2.5 +
     2.6 +fuse-sdl -g 3x --tape $*

     3.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     3.2 +++ b/test.c	Mon Feb 17 10:17:17 2014 +0200
     3.3 @@ -0,0 +1,69 @@
     3.4 +#define FB_ADDR		((unsigned char*)0x4000)
     3.5 +#define ATTR_ADDR	((unsigned char*)0x5800)
     3.6 +#define LINESKIP	(256 / 8)
     3.7 +
     3.8 +unsigned char mbrot(int px, int py);
     3.9 +
    3.10 +int main()
    3.11 +{
    3.12 +	unsigned int i, j, k, start;
    3.13 +
    3.14 +	for(;;) {
    3.15 +		start = 0;
    3.16 +
    3.17 +		for(i=0; i<192; i++) {
    3.18 +			unsigned int banky = i & 0x3f;
    3.19 +			unsigned int cell = banky / 8;
    3.20 +			unsigned int cline = banky % 8;
    3.21 +			unsigned int memline = cell + cline * 8;
    3.22 +			unsigned char *ptr = FB_ADDR + (start + memline) * LINESKIP;
    3.23 +
    3.24 +			for(j=0; j<32; j++) {	/* 256 pixels, 8 pixels per byte */
    3.25 +				unsigned char pixel = 0;
    3.26 +				for(k=0; k<8; k++) {
    3.27 +					unsigned char res = mbrot((j << 3) + k, i);
    3.28 +					pixel = pixel | (res & 1);
    3.29 +					if(k < 7) pixel <<= 1;
    3.30 +				}
    3.31 +				*ptr++ = pixel;
    3.32 +			}
    3.33 +
    3.34 +			if((i & 0x3f) == 0x3f) {
    3.35 +				start += 0x40;
    3.36 +			}
    3.37 +		}
    3.38 +	}
    3.39 +}
    3.40 +
    3.41 +#define int2fix8_8(i)		((i) << 8)
    3.42 +#define fix_mul8_8(a, b)	((a >> 4) * (b >> 4))
    3.43 +#define int2fix5_11(i)		((i) << 11)
    3.44 +#define fix_mul5_11(a, b)	((a >> 5) * (b >> 6))
    3.45 +
    3.46 +unsigned char mbrot(int px, int py)
    3.47 +{
    3.48 +	unsigned char i;
    3.49 +	int cx, cy, zx, zy, x, y, len;
    3.50 +
    3.51 +	cx = int2fix8_8(px - 192) >> 6;
    3.52 +	cy = int2fix8_8(py - 96) >> 6;
    3.53 +
    3.54 +	cx <<= 3;
    3.55 +	cy <<= 3;
    3.56 +
    3.57 +	zx = cx;
    3.58 +	zy = cy;
    3.59 +
    3.60 +	for(i=0; i<32; i++) {
    3.61 +		x = fix_mul5_11(zx, zx) - fix_mul5_11(zy, zy) + cx;
    3.62 +		y = fix_mul5_11(zy, zx) + fix_mul5_11(zx, zy) + cy;
    3.63 +		len = fix_mul5_11(x, x) + fix_mul5_11(y, y);
    3.64 +
    3.65 +		if(len > int2fix5_11(4)) return 0;
    3.66 +
    3.67 +		zx = x;
    3.68 +		zy = y;
    3.69 +	}
    3.70 +
    3.71 +	return 1;
    3.72 +}