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Motorola DSP96002 User Manual

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B-68

DSP96002 USER’S MANUAL

MOTOROLA

3-D Graphics Illumination

Program

ICycles

Words

move #vec,r0 2 2

move #ktbl,r4 2 2

move x:(r0)+,d6.s y:,d7.s 1 1

fmpy.s d6,d7,d0 x:(r0)+,d6.s y:,d7.s 1 1

fmpy.s d6,d7,d1 x:(r0)+,d6.s y:,d7.s 1 1

fmpy d6,d7,d1 fadd.s d1,d0 x:(r0)+,d6.s y:,d7.s 1 1

fmpy d6,d7,d1 fadd.s d1,d0 x:(r4)+,d2.s 1 1

fmpy.s d2,d0,d0 x:(r4)+,n1 1 1

intrz d0 x:(r0)+,d6.s y:,d7.s 1 1

fmpy.s d6,d7,d0 d0.l,r1 1 1

move x:(r0)+,d6.s y:,d7.s 1 1

fmpy d6,d7,d0 fadd.s d0,d1 x:(r1+n1),d2.s 1 2

fadd.s d0,d1 x:(r4)+,d0.s 1 1

fmpy.s d0,d1,d1 x:(r4)+,d0.s 1 1

fadd.s d1,d2 x:(r4)+,d1.s 1 1

fmpy.s d2,d0 x:(r4),d2.s 1 1

fmpy.s d1,d2,d1 1 1

fadd.s d1,d0 1 1

--- ---

Totals: 20 21

The illumination value I is in d0.

Reference: "Fundamentals of Interactive Computer Graphics",

James D. Foley, Andries Van Dam

Addison-Wesley 1982

B.1.36

Pseudorandom Number Generation

This pseudorandom number generator requires a 32 bit seed and returns an unsigned 32 bit random num-

ber. There are no restrictions on the value of the seed. The equation for the seed is:

seed = (69069*seed + 1) mod 2**32

Pseudorandom Number Generation

Program

ICycles

Words

move x:seed,d0.l ;get seed 2 2

move #69069,d1.l ;get constant 2 2

mpyu d0,d1,d0 ;multiply 1 1

inc d0 ; +1 1 1

move d0.l,x:seed ;mod 2**32, new seed 2 2

--- ---

Totals: 8 8