Sprites in MSX-C

If your sprites are objects with defined x and y coordinates you can try the following.

If your sprites are build up from single sprites you can use the VDP to poll for sprite collision. This will speeden up things a little.

Otherwise per each frame you just check and compare the xy coordinates of each object. so you start with object 1 then compare xy for object 2, 3, 4, etc then continue with object 2 etc etc.

Thats the exact reason I am developing for MSX.

I don’t have much experience with sprites myself, but I read not too long ago that most people just do the sprite collision detection manually in code (by comparing x/y coordinates) because the VDP collision is a bit limited and doesn’t work well if you use flickering to show more than 5/8 sprites on a line.

Yup, it seems I have to do it manually indeed Grauw
@TheSpecialist
Thanks, I will see what i get back, will grab my VDP book lateron to check where to look for the collision data.

Hi Wolverine_nl.

Use the below code in your C program.

char vdpvalue = 0;
char *STATFL = (char *)0xF3e7;

vdpvalue = *STATFL & 32;

if (vdpvalue > 0)
{
/* Collision - Paint box red */
boxfill(0, 0, 32, 32, (char) 8, (char) 0);
}
else
{
/* Not Collision - Paint box white */
boxfill(0, 0, 32, 32, (char) 15, (char) 0);
}

Best regards,

Julio Lemos