95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "cv.h"
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#include "cvu.h"
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#define PATTERN ((const cv_vmemp)0x0)
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#define COLOR ((const cv_vmemp)0x2000)
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#define IMAGE ((const cv_vmemp)0x1800)
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#define COLS 32
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#define ROWS 24
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typedef unsigned char byte;
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typedef signed char sbyte;
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typedef unsigned short word;
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void setup_mode2() {
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cvu_vmemset(0, 0, 0x4000);
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cv_set_screen_mode(CV_SCREENMODE_BITMAP); // mode 2
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cv_set_image_table(IMAGE);
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cv_set_character_pattern_t(PATTERN|0x1fff); // AND mask
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cv_set_color_table(COLOR|0xfff); // AND mask
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cv_set_sprite_attribute_table(0x2800);
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{
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byte i=0;
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do {
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cvu_voutb(i, IMAGE+i);
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cvu_voutb(i, IMAGE+0x100+i);
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cvu_voutb(i, IMAGE+0x200+i);
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} while (++i);
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}
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}
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void set_pixel(byte x, byte y, byte color) {
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word ofs = (x/8)*8 + (y/8)*256 + (y&7);
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byte b = cvu_vinb(PATTERN + ofs);
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if (y >= 192) return;
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if (color>1) {
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b |= 128 >> (x&7);
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cvu_voutb(b, PATTERN + ofs);
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cvu_voutb(color<<4, COLOR + ofs);
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} else {
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b &= ~(128 >> (x&7));
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cvu_voutb(b, PATTERN + ofs);
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}
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}
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void draw_line(int x0, int y0, int x1, int y1, byte color)
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{
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int dx, dy, p, x, y;
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dx=x1-x0;
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dy=y1-y0;
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x=x0;
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y=y0;
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p=2*dy-dx;
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while(x<x1)
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{
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if(p>=0)
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{
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set_pixel(x,y,color);
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y=y+1;
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p=p+2*dy-2*dx;
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}
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else
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{
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set_pixel(x,y,color);
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p=p+2*dy;
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}
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x=x+1;
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}
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}
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void main() {
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setup_mode2();
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cv_set_screen_active(true);
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while(1)
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draw_line(rand()&0xff, rand()&0xff, rand()&0xff, rand()&0xff, rand()&15);
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/*
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set_pixel(0, 0, 2);
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set_pixel(1, 0, 2);
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set_pixel(0, 1, 2);
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set_pixel(2, 2, 2);
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set_pixel(3, 3, 2);
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set_pixel(0, 7, 4);
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set_pixel(7, 7, 4);
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set_pixel(8, 7, 4);
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set_pixel(0, 8, 4);
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draw_line(20,0,210,150,2);
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while(1);
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*/
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}
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