mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-19 09:31:24 +00:00
32 lines
603 B
C
32 lines
603 B
C
#include <string.h>
|
|
|
|
typedef unsigned char byte;
|
|
typedef signed char sbyte;
|
|
typedef unsigned short word;
|
|
|
|
byte __at (0x2400) vidmem[224][32]; // 256x224x1 video memory
|
|
|
|
void clrscr() {
|
|
memset(vidmem, 0, sizeof(vidmem));
|
|
}
|
|
|
|
void xor_pixel(byte x, byte y) {
|
|
byte* dest = &vidmem[x][y>>3];
|
|
*dest ^= 0x1 << (y&7);
|
|
}
|
|
|
|
byte xor_sprite(const byte* src, byte x, byte y) {
|
|
byte i,j;
|
|
byte result = 0;
|
|
byte* dest = &vidmem[x][y];
|
|
byte w = *src++;
|
|
byte h = *src++;
|
|
for (j=0; j<h; j++) {
|
|
for (i=0; i<w; i++) {
|
|
result |= (*dest++ ^= *src++);
|
|
}
|
|
dest += 32-w;
|
|
}
|
|
return result;
|
|
}
|