empathicqubit/langtoncant
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This commit is contained in:
Bjorn Einar Bjarntes 2021-12-18 17:38:39 +01:00
parent 8f40d18f9a
commit 6468a122df
1 changed files with 21 additions and 12 deletions
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33
src/main.c
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@ -34,7 +34,7 @@ void setAndClearHiRes(void) {
// Clear colors
for (i =0;i< 1000; i++)
{
*(BYTE*)(0x400+i) = 0x0F;
*(BYTE*)(0x400+i) = 0xF0;
}
}
@ -44,18 +44,28 @@ int isPositionWhite(long x, int y)
return 0; // 0 er false...
}
// https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/
void setPositionBlack(unsigned short x, BYTE y)
int power(int base, int exponent)
{
int ra = 320 * (int)(y/8) + (y & 7);
int ba = 8 * (int)(x/8);
int ma = 2^(7-(x & 7));
int sa = 0x2000;
int ad = sa+ra+ba;
*(BYTE*)(ad) = *(BYTE*)(ad) | ma;
int result=1;
for (exponent; exponent>0; exponent--)
{
result = result * base;
}
return result;
}
void setPositionWhite(long x, int y)
// https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/
void setPositionWhite(unsigned short x, BYTE y)
{
unsigned short ra = (320 * (BYTE)(y/8)) + (y & 7);
unsigned short ba = 8 * (BYTE)(x/8);
unsigned short ma = power(2,(7-(x & 7)));
unsigned short sa = 0x2000;
unsigned short ad = sa+ra+ba;
*(unsigned short*)(ad) = *(unsigned short*)(ad) | ma;
}
void setPositionBlack(long x, int y)
{
}
@ -65,10 +75,9 @@ void setPositionWhite(long x, int y)
int main(void) {
x = 160;
y = 100;
printf("%d", direction);
setAndClearHiRes();
while (1) {
setPositionBlack(x,y);
setPositionWhite(x,y);
x = x+1;
y = y + 1;
}