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From: cycy@isl1.ri.cmu.edu (Scum)
Newsgroups: comp.sys.sgi
Subject: putting and retrieving colours...help!
Message-ID: <10335@pt.cs.cmu.edu>
Date: 28 Aug 90 03:27:01 GMT
Organization: Carnegie-Mellon University, CS/RI
Lines: 49

I'm having a very vexxing problem right now. I'm in doublebuffer, RGB mode.
In the backbuffer, I draw an object in 3-space with 0x01f as it's colour.
Just before this, I turn off lighting mode by binding the material to 0,
set the shademodel to FLAT, and even turn off zbuffering. What I get immediately
back, however, is 0x11 ! To get the colour of the pixel, I cmov to a position
where I drew the object, and use readRGB.

Can somebody help me? I'm getting quite frustrated....

						-- Chris.
						(cycy@ri.cmu.edu)


	printf statements have been removed. ptr->on_colour is an unsigned long.
	...
	...
	...
	...
	if (flag & PCOLOURS) {
		unsigned short red, green, blue;

		czclear(0x00000000, 0xffffff);
		zbuffer(FALSE);
		shademodel(FLAT);
		lmbind(MATERIAL, 0);
		for (ptr= obj_inst; ptr != NULL; ptr = ptr->next) {
			short r,b,g;
    			unsigned char cr, cg, cb;

			green = (short) ((ptr->on_colour>>8) & 0x0ff);
			blue = (short) ((ptr->on_colour>>16) & 0x0ff);
			red = (short) (ptr->on_colour & 0x0ff);
			fprintf(stderr, "red = %d, green = %d, blue = %d\n", red, green, blue);
			RGBrange(red, green, blue, red, green, blue, -1023, 0);
			cpack(ptr->on_colour);
			(ptr->d_funct) (ptr);
			cmov(ptr->params[0].arg,ptr->params[1].arg,ptr->params[2].arg);
    			readRGB(1,&cr,&cg,&cb);
			}
		RGBrange(0, 0, 0, 255, 255, 255, -1023, 0);
		zbuffer(TRUE);
		shademodel(GOURAUD);
	}
}

-- 

                                       -- Chris. (cycy@isl1.ri.cmu.edu)
"People make me pro-nuclear." -- Margarette Smith