The Powder Toy

Videogamer555

I notice the graphics routine for PLSM uses this code:

	*colr = (unsigned char)plasma_data[caddress];
	*colg = (unsigned char)plasma_data[caddress+1];
	*colb = (unsigned char)plasma_data[caddress+2];
	
	*firea = 255;
	*firer = *colr;
	*fireg = *colg;
	*fireb = *colb;

The * before the variables means specifying an address and NOT an actual color value. What if I want to change this and specify an actual color value if I want a particular color, rather than having it look up the color at a memory address. Any help here would be great. Thanks in advance.

tommig

You can fiddle with the caddress+ values. I assume you want white, I worked that out earlier, so just set it to this:


	*colr = (unsigned char)plasma_data[caddress];
	*colg = (unsigned char)plasma_data[caddress];
	*colb = (unsigned char)plasma_data[caddress];

jacksonmj

The graphics function is passed pointers to the variables where the colours should be stored.

colr is the address of the variable containing the red colour value. *colr dereferences the pointer, and lets you read/write the colour value. Changing the value of *colr changes the colour value.

So to change the red colour value to 63, just do:
*colr = 63;

Graphics use addresses?