defs.h File Reference

basic definitions and utilities More...

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Defines
#define	map_block(x, y)   ((((y) & ~(7)) << 5) + ((x) & ~(7)))
	maps a block in the screen 2 model
#define	map_pixel(x, y)   (map_block(x,y) + ((y) & 7))
	maps a pixel coordinate to a vram address
#define	map_subpixel(x)   (128 >> ((x) & 7))
	maps the subpixel (bit) inside the vram byte
#define	i2f(v)   ((v) << 6)
	integer to fixed-point
#define	f2i(v)   ((v) >> 6)
	fixed-point to integer
#define	mulfx(x, y)   ((LONG(y) * LONG(x)) >> 6)
	fixed-point multiplication
#define	divfx(x, y)   ((LONG(x) << 6) / LONG(y))
	fixed-point division
#define	sqrfx(x)   ((LONG(x) * LONG(x)) >> 6)
	fixed-point square
#define	sqrtfx(x)   (LONG(sqrt(x)) << 3)
	fixed-point square root
#define	wgavgfx(x, y, w)   (mulfx(i2f(1) - w, x) + mulfx(w, y))
	weighted average (w=0.0 -> x, w=0.5->average, w=1.0 ->y)
#define	new(x)   ((x*)malloc(sizeof(x)))
	allocates space for 1 element of type x
#define	newa(x, c)   ((x*)malloc(sizeof(x) * c))
	allocates space for c elements of type x

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Detailed Description

basic definitions and utilities

Definition in file defs.h.

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