89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
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#include <stdlib.h>
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#include <string.h>
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#include "cv.h"
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#include "cvu.h"
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#define PATTERN ((const cv_vmemp)0x0000)
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#define IMAGE ((const cv_vmemp)0x1800)
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#define COLS 64
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#define ROWS 48
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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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uintptr_t __at(0x6a) font_bitmap_a;
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uintptr_t __at(0x6c) font_bitmap_0;
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void setup_multicolor() {
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cvu_vmemset(0, 0, 0x4000);
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cv_set_image_table(IMAGE);
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cv_set_character_pattern_t(PATTERN);
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cv_set_screen_mode(CV_SCREENMODE_MULTICOLOR); // mode 3
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// set image table
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{
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byte x,y;
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word ofs = IMAGE;
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for (y=0; y<ROWS; y++) {
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for (x=0; x<COLS/2; x++) {
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cvu_voutb(x + (y>>2)*COLS/2, ofs++);
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}
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}
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}
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}
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static word next_pg[4] = { 0, 0, 0, 0 };
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void set_pixel(byte x, byte y, byte color) {
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word pg = (x>>1) * 8 + (y & 7) + (y & ~7)*32;
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byte b = cvu_vinb(pg);
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b |= (x & 1) ? color : color<<4;
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cvu_voutb(b, PATTERN + pg);
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}
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void draw_line(sbyte x0, sbyte y0, sbyte x1, sbyte 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_multicolor();
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set_pixel(0, 0, 4);
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set_pixel(1, 0, 4);
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set_pixel(COLS-1, 0, 4);
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set_pixel(0, 1, 6);
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set_pixel(0, 2, 6);
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set_pixel(0, 3, 6);
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set_pixel(1, 4, 4);
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set_pixel(2, 6, 5);
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set_pixel(4, 7, 5);
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set_pixel(7, 7, 5);
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set_pixel(8, 8, 5);
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draw_line(0, 0, COLS-1, ROWS-1, 2);
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cv_set_screen_active(true);
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while (1);
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}
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