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Amiga CD32 Gamer 16
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CD32 Gamer - 1995 - Issue 16.iso
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c2p_000.s
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1994-11-13
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298 lines
; Chunky2Planar algorithm, originally by James McCoull
; Modified by Peter McGavin for variable size and depth
; and "dirty list" (hope I didn't slow it down too much)
;
; Cpu only solution
; Originally optimised for 020+fastram
; Tried to optimise for 68000
;void __asm c2p_8 (register __a0 UBYTE *chunky_data,
; register __a1 PLANEPTR raster,
; register __a2 UBYTE *dirty_list,
; register __d1 ULONG plsiz,
; a0 -> width*height chunky pixels in fastmem
; a1 -> contiguous bitplanes in chipmem
; a2 -> dirty list (1-byte flag for whether each 32 pixel "unit" needs updating)
; d1 = width*height/8 (width*height must be a multiple of 32)
ifeq depth-8
xdef _c2p_8_000
_c2p_8_000:
else
ifeq depth-6
xdef _c2p_6_000
_c2p_6_000:
else
ifeq depth-4
xdef _c2p_4_000
_c2p_4_000:
else
fail "unsupported depth!"
endc
endc
endc
wordmerge macro ; i1 i2 tmp
; \1 \2 \3
move.l \2,\3 ; 4 \3 = CD
move.w \1,\2 ; 4 \2 = CB
swap \2 ; 4 \2 = BC
move.w \2,\1 ; 4 \1 = AC
move.w \3,\2 ; 4 \2 = BD
endm ; 20
merge macro ; io in out tmp msk sft
; \1 \2 \3 \4 \5 \6
; \1 = abqr
; \2 = ijyz
move.l \5,\3 ; 4 \3 = 0x0x
move.l \3,\4 ; 4 \4 = 0x0x
and.l \1,\3 ; 8 \3 = 0b0r
and.l \2,\4 ; 8 \4 = 0j0z
eor.l \3,\1 ; 8 \1 = a0q0
eor.l \4,\2 ; 8 \2 = i0y0
lsr.l #\6,\2 ; 8+2*sft \2 = 0i0y
ifeq \6-1
add.l \3,\3 ; 8
else
lsl.l #\6,\3 ; 8+2*sft \3 = b0r0
endc
or.l \2,\1 ; 8 \1 = aiqy
or.l \4,\3 ; 8 \3 = bjrz
endm ; 72+4*sft
merge4 macro ; io in out tmp msk
ifgt depth-4
merge \1,\2,\3,\4,\5,4
else
move.l \5,\3 ; this version returns only 1 result
and.l \3,\2 ; \2 = 0j0z
and.l \1,\3 ; \3 = 0b0r
lsl.l #4,\3 ; \3 = b0r0
or.l \2,\3 ; \3 = bjrz
endc
endm
; the real c2p routine starts here
movem.l d2-d7/a2-a6,-(sp)
sub.w #24,sp ; space for temporary variables
; a0 = chunky buffer
; a1 = output area
; a2 = dirty list
; d1 = plsiz
move.l d1,(4,sp) ; save plsiz
lsl.l #3,d1 ; 8*plsiz
move.l a0,(sp)
add.l d1,(sp) ; (sp) -> end of chunky buffer
sub.l (4,sp),d1
ifle depth-6
sub.l (4,sp),d1
sub.l (4,sp),d1
endc
ifle depth-4
sub.l (4,sp),d1
sub.l (4,sp),d1
endc
move.l d1,(8,sp) ; save 7*plsiz (or 5*plsiz) (or 3*plsiz)
adda.l d1,a1 ; a1 -> plane7 (or plane5) (or plane3)
move.l #$00ff00ff,a3 ; load byte merge mask
move.l #$0f0f0f0f,a4 ; load nibble merge mask
; pass 1
initloop: tst.b (a2)+ ; does next 32 pixel unit need updating?
bne.b c2p ; branch if yes
adda.w #32,a0 ; skip 32 pixels on input
addq.l #4,a1 ; skip 32 pixels on output
cmpa.l (sp),a0
bne.b initloop
bra.w exit ; exit if no changes
; this becomes the main loop after the first change is found
mainloop: tst.b (a2)+ ; 8 does next 32 pixel unit need updating?
bne.b c2p ; 10
adda.w #32,a0 ; skip 32 pixels on input
addq.l #4,a1 ; skip 32 pixels on output
cmpa.l (sp),a0
bne.b mainloop
bra.w exit
; convert next 32 pixels and return to mainloop
c2p: movem.l (a0)+,d0-d7 ; 76 get 32 pixels in registers
; d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0
; d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0
; d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0
; d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0
; d4 = q7q6q5q4q3q2q1q0 r7r6r5r4r3r2r1r0 s7s6s5s4s3s2s1s0 t7t6t5t4t3t2t1t0
; d5 = u7u6u5u4u3u2u1u0 v7v6v5v4v3v2v1v0 w7w6w5w4w3w2w1w0 x7x6x5x4x3x2x1x0
; d6 = y7y6y5y4y3y2y1y0 z7z6z5z4z3z2z1z0 A7A6A5A4A3A2A1A0 B7B6B5B4B3B2B1B0
; d7 = C7C6C5C4C3C2C1C0 D7D6D5D4D3D2D1D0 E7E6E5E4E3E2E1E0 F7F6F5F4F3F2F1F0
wordmerge d0,d4,a6 ; 20 d0/4 = abqr cdst
wordmerge d1,d5,a6 ; 20 d1/5 = efuv ghwx
wordmerge d2,d6,a6 ; 20 d2/6 = ijyz klAB
wordmerge d3,d7,a6 ; 20 d3/7 = mnCD opEF
; d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 q7q6q5q4q3q2q1q0 r7r6r5r4r3r2r1r0
; d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 u7u6u5u4u3u2u1u0 v7v6v5v4v3v2v1v0
; d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 y7y6y5y4y3y2y1y0 z7z6z5z4z3z2z1z0
; d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 C7C6C5C4C3C2C1C0 D7D6D5D4D3D2D1D0
; d4 = c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0 s7s6s5s4s3s2s1s0 t7t6t5t4t3t2t1t0
; d5 = g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0 w7w6w5w4w3w2w1w0 x7x6x5x4x3x2x1x0
; d6 = k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0 A7A6A5A4A3A2A1A0 B7B6B5B4B3B2B1B0
; d7 = o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0 E7E6E5E4E3E2E1E0 F7F6F5F4F3F2F1F0
; temporarily save off some registers
movea.l d6,a6 ; 4
movea.l d7,a5 ; 4
; set up pass 2 & 3 masks
move.l #$00ff00ff,a3 ; 8
move.l #$0f0f0f0f,a4 ; 8
; pass 2
merge d0,d2,d6,d7,a3,8 ;104 d0/d6 = aiqy bjrz
merge d1,d3,d7,d2,a3,8 ;104 d1/d7 = emuc fnvD
; d0 = a7a6a5a4a3a2a1a0 i7i6i5i4i3i2i1i0 q7q6q5q4q3q2q1q0 y7y6y5y4y3y2y1y0
; d6 = b7b6b5b4b3b2b1b0 j7j6j5j4j3j2j1j0 r7r6r5r4r3r2r1r0 z7z6z5z4z3z2z1z0
; d1 = e7e6e5e4e3e2e1e0 m7m6m5m4m3m2m1m0 u7u6u5u4u3u2u1u0 C7C6C5C4C3C2C1C0
; d7 = f7f6f5f4f3f2f1f0 n7n6n5n4n3n2n1n0 v7v6v5v4v3v2v1v0 D7D6D5D4D3D2D1D0
; pass 3
merge4 d0,d1,d2,d3,a4,4 ;88 d0/d2 = ae74... ae30...
merge4 d6,d7,d3,d1,a4,4 ;88 d6/d3 = bf74... bf30...
; d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 q7q6q5q4u7u6u5u4 y7y6y5y4C7C6C5C4
; d2 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 q3q2q1q0u3u2u1u0 y3y2y1y0C3C2C1C0
; d6 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 r7r6r5r4v7v6v5v4 z7z6z5z4D7D6D5D4
; d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 r3r2r1r0v3v2v1v0 z3z2z1z0D3D2D1D0
; exchange them
exg a6,d2 ; 4
exg a5,d3 ; 4
; d2 = k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0 A7A6A5A4A3A2A1A0 B7B6B5B4B3B2B1B0
; d3 = o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0 E7E6E5E4E3E2E1E0 F7F6F5F4F3F2F1F0
; pass 2
merge d4,d2,d7,d1,a3,8 ;104 d4/d7 = cksA dltB
merge d5,d3,d1,d2,a3,8 ;104 d5/d1 = gowE hpxF
; d4 = c7c6c5c4c3c2c1c0 k7k6k5k4k3k2k1k0 s7s6s5s4s3s2s1s0 A7A6A5A4A3A2A1A0
; d7 = d7d6d5d4d3d2d1d0 l7l6l5l4l3l2l1l0 t7t6t5t4t3t2t1t0 B7B6B5B4B3B2B1B0
; d5 = g7g6g5g4g3g2g1g0 o7o6o5o4o3o2o1o0 w7w6w5w4w3w2w1w0 E7E6E5E4E3E2E1E0
; d1 = h7h6h5h4h3h2h1h0 p7p6p5p4p3p2p1p0 x7x6x5x4x3x2x1x0 F7F6F5F4F3F2F1F0
; pass 3
merge4 d4,d5,d3,d2,a4,4 ;88 d4/d3 = cg74.. cg30..
merge4 d7,d1,d5,d2,a4,4 ;88 d7/d5 = dh74.. dh30..
; d4 = c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4 s7s6s5s4w7w6w5w4 A7A6A5A4E7E6E5E4
; d3 = c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0 s3s2s1s0w3w2w1w0 A3A2A1A0E3E2E1E0
; d7 = d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4 t7t6t5t4x7x6x5x4 B7B6B5B4F7F6F5F4
; d5 = d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0 t3t2t1t0x3x2x1x0 B3B2B1B0F3F2F1F0
; set up pass 4 & 5 masks
move.l #$33333333,a3 ; 8
move.l #$55555555,a4 ; 8
ifgt depth-4
; pass 4
merge d0,d4,d1,d2,a3,2 ;80 d0/d1 = aceg76.. aceg54..
merge d6,d7,d4,d2,a3,2 ;80 d6/d4 = bdhf76.. bdhf54..
; d0 = a7a6c7c6e7e6g7g6 i7i6k7k6m7m6o7o6 q7q6s7s6u7u6w7w6 y7y6A7A6C7C6E7E6
; d1 = a5a4c5c4g5g4e5e4 i5i4k5k4m5m4o5o4 q5q4s5s4u5u4w5w4 y5y4A5A4C5C4E5E4
; d6 = b7b6d7d6f7f6h7h6 j7j6l7l6n7n6p7p6 r7r6t7t6v7v6x7x6 z7z6B7B6D7D6F7F6
; d4 = b5b4d5d4h5h4f5f4 j5j4l5l4n5n4p5p4 r5r4t5t4v5v4x5x4 z5z4B5B4D5D4F5F4
; pass 5
ifgt depth-6
merge d0,d6,d7,d2,a4,1 ;74 d0/d7 = abcd7... abcd6...
endc
merge d1,d4,d6,d2,a4,1 ;74 d1/d6 = abcd5... abcd4...
; d0 = a7b7c7d7e7f7g7h7 i7j7k7l7m7n7o7p7 q7r7s7t7u7v7w7x7 y7z7A7B7C7D7E7F7
; d7 = a6b6c6d6e6f6g6h6 i6j6k6l6m6n6o6p6 q6r6s6t6u6v6w6x6 y6z6A6B6C6D6E6F6
; d1 = a5b5c5d5g5h5e5f5 i5j5k5l5m5n5o5p5 q5r5s5t5u5v5w5x5 y5z5A5B5C5D5E5F5
; d6 = a4b4c4d4g4h4e4f4 i4j4k4l4m4n4o4p4 q4r4s4t4u4v4w4x4 y4z4A4B4C4D4E4F4
endc
move.l (4,sp),d2 ; 12 d2 = plsiz
ifgt depth-4
ifgt depth-6
move.l d0,(a1) ; 8 plane7
suba.l d2,a1 ; 8 -plsiz
move.l d7,(a1) ; 8 plane6
suba.l d2,a1 ; 8 -plsiz
endc
move.l d1,(a1) ; 8 plane5
suba.l d2,a1 ; 8 -plsiz
move.l d6,(a1) ; 8 plane4
suba.l d2,a1 ; 8 -plsiz
endc
; restore them
move.l a6,d1 ; 4
move.l a5,d7 ; 4
; d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 q3q2q1q0u3u2u1u0 y3y2y1y0C3C2C1C0
; d7 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 r3r2r1r0v3v2v1v0 z3z2z1z0D3D2D1D0
; d3 = c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0 s3s2s1s0w3w2w1w0 A3A2A1A0E3E2E1E0
; d5 = d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0 t3t2t1t0x3x2x1x0 B3B2B1B0F3F2F1F0
; pass 4
merge d1,d3,d6,d0,a3,2 ;80 d1/d6 = aceg32.. aceg10..
merge d7,d5,d0,d3,a3,2 ;80 d7/d0 = bdhf32.. bdhf10..
; d1 = a3a2c3c2e3e2g3g2 i3i2k3k2m3m2o3o2 q3q2s3s2u3u2w3w2 y3y2A3A2C3C2E3E2
; d6 = a1a0c1c0g1g0e1e0 i1i0k1k0m1m0o1o0 q1q0s1s0u1u0w1w0 y1y0A1A0C1C0E1E0
; d7 = b3b2d3d2f3f2h3h2 j3j2l3l2n3n2p3p2 r3r2t3t2v3v2x3x2 z3z2B3B2D3D2F3F2
; d0 = b1b0d1d0h1h0f1f0 j1j0l1l0n1n0p1p0 r1r0t1t0v1v0x1x0 z1z0B1B0D1D0F1F0
; pass 5
merge d1,d7,d5,d3,a4,1 ;74 d1/d5 = abcd3... abcd2...
merge d6,d0,d7,d3,a4,1 ;74 d6/d7 = abcd1... abcd0...
; d1 = a3b3c3d3e3f3g3h3 i3j3k3l3m3n3o3p3 q3r3s3t3u3v3w3x3 y3z3A3B3C3D3E3F3
; d5 = a2b2c2d2e2f2g2h2 i2j2k2l2m2n2o2p2 q2r2s2t2u2v2w2x2 y2z2A2B2C2D2E2F2
; d6 = a1b1c1d1g1h1e1f1 i1j1k1l1m1n1o1p1 q1r1s1t1u1v1w1x1 y1z1A1B1C1D1E1F1
; d7 = a0b0c0d0g0h0e0f0 i0j0k0l0m0n0o0p0 q0r0s0t0u0v0w0x0 y0z0A0B0C0D0E0F0
move.l d1,(a1) ; 8 plane3
suba.l d2,a1 ; 8 -plsiz
move.l d5,(a1) ; 8 plane2
suba.l d2,a1 ; 8 -plsiz
move.l d6,(a1) ; 8 plane1
suba.l d2,a1 ; 8 -plsiz
move.l d7,(a1)+ ; 8 plane 0
adda.l (8,sp),a1 ; 18 +7*plsiz (or 5*plsiz) (or 3*plsiz)
cmp.l (sp),a0 ; 14
bne.w mainloop ; 10 end of main loop
;1788 cycles = 55.9 cycles/pixel
exit:
add.w #24,sp
movem.l (sp)+,d2-d7/a2-a6
rts
end:
end