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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 #define BYTE unsigned char
short i; short i;
short x; short x;
short y; BYTE y;
BYTE direction; 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*)0xd011 = *(BYTE*)0xd011 | 0xb0 ; // Graphics on
*(BYTE*)0xd016 = *(BYTE*)0xd016 & 240; //Multi color off *(BYTE*)0xd016 = *(BYTE*)0xd016 & 240; //Multi color off
*(BYTE*)0xd018 = *(BYTE*)0xd018 | 8 ; // Graphics to $2000 *(BYTE*)0xd018 = *(BYTE*)0xd018 | 8 ; // Graphics to $2000
} }
void clearHiRes(void) { void clearHiRes() {
for (i =0;i< 8000; i++) for (i =0;i< 8000; i++)
{ {
*(BYTE*)(0x2000+i) = 0; *(BYTE*)(0x2000+i) = 0;
@ -22,47 +27,43 @@ void clearHiRes(void) {
} }
} }
void fillHiRes(void) { void fillHiRes() {
for (i =0;i< 8000; i++) for (i =0;i< 8000; i++)
{ {
*(BYTE*)(0x2000+i) = 0xff; *(BYTE*)(0x2000+i) = 0xff;
} }
} }
void setAndClearHiRes(){ void setAndClearHiRes(){
setHiRes(); setHiRes();
clearHiRes(); clearHiRes();
} }
BYTE isPositionWhite(short x, BYTE y) BYTE isPositionWhite() {
{ ra = (320 * (BYTE)(y/8)) + (y & 7);
short ra = (320 * (BYTE)(y/8)) + (y & 7); ba = 8 * (BYTE)(x/8);
BYTE ba = 8 * (BYTE)(x/8); ma = 1 << ((7-(x & 7)));
BYTE ma = 1 << ((7-(x & 7))); sa = 0x2000;
short sa = 0x2000; ad = sa+ra+ba;
short ad = sa+ra+ba;
return *(BYTE*)(ad) & ma; return *(BYTE*)(ad) & ma;
} }
// https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/ // https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/
void setPositionWhite(short x, short y) void setPositionWhite() {
{ ra = (320 * (y/8)) + (y & 7);
short ra = (320 * (short)(y/8)) + (y & 7); ba = 8 * (short)(x/8);
BYTE ba = 8 * (short)(x/8); ma = 1 << ((7-(x & 7)));
BYTE ma = 1 << ((7-(x & 7))); sa = 0x2000;
short sa = 0x2000; ad = sa+ra+ba;
short ad = sa+ra+ba;
*(short*)(ad) = *(short*)(ad) | ma; *(short*)(ad) = *(short*)(ad) | ma;
} }
void setPositionBlack(short x, short y) void setPositionBlack() {
{ ra = 320 * (y/8) + (y & 7);
short ra = (320 * (short)(y/8)) + (y & 7); ba = 8 * (short)(x/8);
BYTE ba = 8 * (short)(x/8); ma = (1 << ((7-(x & 7))));
BYTE ma = (1 << ((7-(x & 7)))); sa = 0x2000;
short sa = 0x2000; ad = sa+ra+ba;
short ad = sa+ra+ba;
*(short*)(ad) = (*(short*)(ad)) & ~ma; *(short*)(ad) = (*(short*)(ad)) & ~ma;
} }
@ -86,14 +87,13 @@ void turnRight(){
direction = direction - 64; direction = direction - 64;
} }
void makeMove() { void makeMove() {
if (isPositionWhite(x,y)) { if (isPositionWhite()) {
turnRight(); turnRight();
setPositionBlack(x,y); setPositionBlack();
} else { } else {
turnLeft(); turnLeft();
setPositionWhite(x,y); setPositionWhite();
} }
moveForward(); moveForward();
} }
@ -103,7 +103,7 @@ int main(void) {
x = 160; x = 160;
y = 100; y = 100;
direction = 0; direction = 0;
while(1) while(x > 0 && x < 320 && y > 0 && y < 200)
{ {
makeMove(); makeMove();
} }