empathicqubit/langtoncant
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trying to speed things up a bit

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This commit is contained in:
Bjorn Einar Bjarntes 2021-12-18 21:23:44 +01:00
parent e9ff1405df
commit cc31473aaa
1 changed files with 32 additions and 32 deletions
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64
src/main.c
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@ -1,16 +1,21 @@
#include <stdio.h>
#define BYTE unsigned char
short i;
short x;
short y;
BYTE y;
BYTE direction;
void setHiRes(void) {
short ra;
BYTE ba;
BYTE ma;
short sa;
short ad;
void setHiRes() {
*(BYTE*)0xd011 = *(BYTE*)0xd011 | 0xb0 ; // Graphics on
*(BYTE*)0xd016 = *(BYTE*)0xd016 & 240; //Multi color off
*(BYTE*)0xd018 = *(BYTE*)0xd018 | 8 ; // Graphics to $2000
}
void clearHiRes(void) {
void clearHiRes() {
for (i =0;i< 8000; i++)
{
*(BYTE*)(0x2000+i) = 0;
@ -22,47 +27,43 @@ void clearHiRes(void) {
}
}
void fillHiRes(void) {
void fillHiRes() {
for (i =0;i< 8000; i++)
{
*(BYTE*)(0x2000+i) = 0xff;
}
}
void setAndClearHiRes(){
setHiRes();
clearHiRes();
}
BYTE isPositionWhite(short x, BYTE y)
{
short ra = (320 * (BYTE)(y/8)) + (y & 7);
BYTE ba = 8 * (BYTE)(x/8);
BYTE ma = 1 << ((7-(x & 7)));
short sa = 0x2000;
short ad = sa+ra+ba;
BYTE isPositionWhite() {
ra = (320 * (BYTE)(y/8)) + (y & 7);
ba = 8 * (BYTE)(x/8);
ma = 1 << ((7-(x & 7)));
sa = 0x2000;
ad = sa+ra+ba;
return *(BYTE*)(ad) & ma;
}
// https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/
void setPositionWhite(short x, short y)
{
short ra = (320 * (short)(y/8)) + (y & 7);
BYTE ba = 8 * (short)(x/8);
BYTE ma = 1 << ((7-(x & 7)));
short sa = 0x2000;
short ad = sa+ra+ba;
void setPositionWhite() {
ra = (320 * (y/8)) + (y & 7);
ba = 8 * (short)(x/8);
ma = 1 << ((7-(x & 7)));
sa = 0x2000;
ad = sa+ra+ba;
*(short*)(ad) = *(short*)(ad) | ma;
}
void setPositionBlack(short x, short y)
{
short ra = (320 * (short)(y/8)) + (y & 7);
BYTE ba = 8 * (short)(x/8);
BYTE ma = (1 << ((7-(x & 7))));
short sa = 0x2000;
short ad = sa+ra+ba;
void setPositionBlack() {
ra = 320 * (y/8) + (y & 7);
ba = 8 * (short)(x/8);
ma = (1 << ((7-(x & 7))));
sa = 0x2000;
ad = sa+ra+ba;
*(short*)(ad) = (*(short*)(ad)) & ~ma;
}
@ -86,14 +87,13 @@ void turnRight(){
direction = direction - 64;
}
void makeMove() {
if (isPositionWhite(x,y)) {
if (isPositionWhite()) {
turnRight();
setPositionBlack(x,y);
setPositionBlack();
} else {
turnLeft();
setPositionWhite(x,y);
setPositionWhite();
}
moveForward();
}
@ -103,7 +103,7 @@ int main(void) {
x = 160;
y = 100;
direction = 0;
while(1)
while(x > 0 && x < 320 && y > 0 && y < 200)
{
makeMove();
}