Motorola DSP96002 - Manual (Page 579)

B-60 DSP96002 USER’S MANUAL MOTOROLA
Registers:
d0 = x d4 = limit
d1 = y d5 = unused
d2 = z d6 = unused
d3 = unused d7 = unused
Memory Map:
X Memory Y Memory
Xmin
←
r0
Xmax
Ymin
Ymax
Zmin
Zmax
Single Point Accept/Reject
Program ICycles
Words
ori #$80,ccr ;set accept bit 1 1
move y:(r0)+,d4.s ;get window minimum 1 1
fcmp d4,d0 y:(r0)+,d4.s ;x-Xmin 1 1
fcmp d0,d4 y:(r0)+,d4.s ;Xmax-x 1 1
fcmp d4,d1 y:(r0)+,d4,s ;y-Ymin 1 1
fcmp d1,d4 y:(r0)+,d4.s ;Ymax-y 1 1
fcmp d4,d2 y:(r0)+,d4.s ;z-Zmin 1 1
fcmp d2,d4 ;Zmax-z 1 1
--- ---
Totals: 8 8
If the point is within the limits, then the A bit of the CCR is equal to one, otherwise, the point can be rejected.
B.1.33.2 Line Accept/Reject, floating-point Version
This determines if the line from (x0,y0,z0) to (x1,y1,z1) is within a three-dimensional view cube. If the line
is within the cube, the A (accept) bit of the CCR will be set. If the line is entirely outside of the cube, then
the R bit will be cleared. If the line can not be accepted or rejected, then further processing is required to
clip the line where it intersects with a boundary plane.
Registers:
d0 = dimension d4 = unused
d1 = limit d5 = unused
d2 = unused d6 = unused
d3 = unused d7 = unused
Memory Map: