1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
|
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/*
Chunky to planar conversion routine
1 byte/pixel -> 4 or 8 bit planes
Patrice Mandin
Xavier Joubert
Mikael Kalms
*/
.globl _SDL_Atari_C2pConvert
.globl _SDL_Atari_C2pConvert8
.globl _SDL_Atari_C2pConvert4
.globl _SDL_Atari_C2pConvert4_pal
/* ------------ Conversion C2P, 8 bits ------------ */
.text
_SDL_Atari_C2pConvert8:
movel sp@(4),c2p_source
movel sp@(8),c2p_dest
movel sp@(12),c2p_width
movel sp@(16),c2p_height
movel sp@(20),c2p_dblligne
movel sp@(24),c2p_srcpitch
movel sp@(28),c2p_dstpitch
moveml d2-d7/a2-a6,sp@-
movel c2p_source,c2p_cursrc
movel c2p_dest,c2p_curdst
movel #0x0f0f0f0f,d4
movel #0x00ff00ff,d5
movel #0x55555555,d6
movew c2p_height+2,c2p_row
movew c2p_width+2,d0
andw #-8,d0
movew d0,c2p_rowlen
SDL_Atari_C2p8_rowloop:
movel c2p_cursrc,a0
movel c2p_curdst,a1
movel a0,a2
addw c2p_rowlen,a2
movel a0@+,d0
movel a0@+,d1
movel a0@+,d2
movel a0@+,d3
/*
d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0
d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0
d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0
d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0
*/
movel d1,d7
lsrl #4,d7
eorl d0,d7
andl d4,d7
eorl d7,d0
lsll #4,d7
eorl d7,d1
movel d3,d7
lsrl #4,d7
eorl d2,d7
andl d4,d7
eorl d7,d2
lsll #4,d7
eorl d7,d3
movel d2,d7
lsrl #8,d7
eorl d0,d7
andl d5,d7
eorl d7,d0
lsll #8,d7
eorl d7,d2
movel d3,d7
lsrl #8,d7
eorl d1,d7
andl d5,d7
eorl d7,d1
lsll #8,d7
eorl d7,d3
/*
d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4
d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0
d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4
d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0
*/
bras SDL_Atari_C2p8_start
SDL_Atari_C2p8_pix16:
movel a0@+,d0
movel a0@+,d1
movel a0@+,d2
movel a0@+,d3
/*
d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0
d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0
d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0
d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0
*/
movel d1,d7
lsrl #4,d7
movel a3,a1@+
eorl d0,d7
andl d4,d7
eorl d7,d0
lsll #4,d7
eorl d7,d1
movel d3,d7
lsrl #4,d7
eorl d2,d7
andl d4,d7
eorl d7,d2
movel a4,a1@+
lsll #4,d7
eorl d7,d3
movel d2,d7
lsrl #8,d7
eorl d0,d7
andl d5,d7
eorl d7,d0
movel a5,a1@+
lsll #8,d7
eorl d7,d2
movel d3,d7
lsrl #8,d7
eorl d1,d7
andl d5,d7
eorl d7,d1
movel a6,a1@+
lsll #8,d7
eorl d7,d3
/*
d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4
d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0
d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4
d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0
*/
SDL_Atari_C2p8_start:
movel d2,d7
lsrl #1,d7
eorl d0,d7
andl d6,d7
eorl d7,d0
addl d7,d7
eorl d7,d2
movel d3,d7
lsrl #1,d7
eorl d1,d7
andl d6,d7
eorl d7,d1
addl d7,d7
eorl d7,d3
/*
d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5
d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1
d2 = a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4
d3 = a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0
*/
movew d2,d7
movew d0,d2
swap d2
movew d2,d0
movew d7,d2
movew d3,d7
movew d1,d3
swap d3
movew d3,d1
movew d7,d3
/*
d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4
d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0
d2 = c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4
d3 = c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0
*/
movel d2,d7
lsrl #2,d7
eorl d0,d7
andl #0x33333333,d7
eorl d7,d0
lsll #2,d7
eorl d7,d2
movel d3,d7
lsrl #2,d7
eorl d1,d7
andl #0x33333333,d7
eorl d7,d1
lsll #2,d7
eorl d7,d3
/*
d0 = a7b7c7d7e7f7g7h7 i7j7k7l7m7n7o7p7 a6b6c6d6e6f6g6h6 i6j6k6l6m6n6o6p6
d1 = a3b3c3d3e3f3g3h3 i3j3k3l3m3n3o3p3 a2b2c2d2e2f2g2h2 i2j2k2l2m2n2o2p2
d2 = a5b5c5d5e5f5g5h5 i5j5k5l5m5n5o5p5 a4b4c4d4e4f4g4h4 i4j4k4l4m4n4o4p4
d3 = a1b1c1d1e1f1g1h1 i1j1k1l1m1n1o1p1 a0b0c0d0e0f0g0h0 i0j0k0l0m0n0o0p0
*/
swap d0
swap d1
swap d2
swap d3
movel d0,a6
movel d2,a5
movel d1,a4
movel d3,a3
cmpl a0,a2
bgt SDL_Atari_C2p8_pix16
movel a3,a1@+
movel a4,a1@+
movel a5,a1@+
movel a6,a1@+
/* Double the line ? */
movel c2p_srcpitch,d0
movel c2p_dstpitch,d1
tstl c2p_dblligne
beqs SDL_Atari_C2p8_nodblline
movel c2p_curdst,a0
movel a0,a1
addl d1,a1
movew c2p_width+2,d7
lsrw #4,d7
subql #1,d7
SDL_Atari_C2p8_dblloop:
movel a0@+,a1@+
movel a0@+,a1@+
movel a0@+,a1@+
movel a0@+,a1@+
dbra d7,SDL_Atari_C2p8_dblloop
addl d1,c2p_curdst
SDL_Atari_C2p8_nodblline:
/* Next line */
addl d0,c2p_cursrc
addl d1,c2p_curdst
subqw #1,c2p_row
bne SDL_Atari_C2p8_rowloop
moveml sp@+,d2-d7/a2-a6
rts
/* ------------ Conversion C2P, 4 bits ------------ */
_SDL_Atari_C2pConvert4:
movel sp@(4),c2p_source
movel sp@(8),c2p_dest
movel sp@(12),c2p_width
movel sp@(16),c2p_height
movel sp@(20),c2p_dblligne
movel sp@(24),c2p_srcpitch
movel sp@(28),c2p_dstpitch
moveml d2-d7/a2-a6,sp@-
movel c2p_source,a0
movel c2p_dest,a1
lea _SDL_Atari_table_c2p,a2
movel #0x00070001,d3
#if defined(__M68020__)
moveq #0,d0
#endif
movel c2p_height,d7
subql #1,d7
c2p4_bcly:
movel a0,a4 | Save start address of source
movel a1,a5 | Save start address of dest
| Conversion
movel c2p_width,d6
lsrw #4,d6
subql #1,d6
c2p4_bclx:
| Octets 0-7
moveq #0,d1
moveq #7,d5
c2p4_bcl07:
#if defined(__M68020__)
moveb a0@+,d0
lea a2@(0,d0:w:4),a3
#else
moveq #0,d0
moveb a0@+,d0
lslw #2,d0
lea a2@(0,d0:w),a3
#endif
lsll #1,d1
orl a3@,d1
dbra d5,c2p4_bcl07
movepl d1,a1@(0)
addw d3,a1
swap d3
| Octets 8-15
moveq #0,d1
moveq #7,d5
c2p4_bcl815:
#if defined(__M68020__)
moveb a0@+,d0
lea a2@(0,d0:w:4),a3
#else
moveq #0,d0
moveb a0@+,d0
lslw #2,d0
lea a2@(0,d0:w),a3
#endif
lsll #1,d1
orl a3@,d1
dbra d5,c2p4_bcl815
movepl d1,a1@(0)
addw d3,a1
swap d3
dbra d6,c2p4_bclx
| Double line ?
tstl c2p_dblligne
beqs c2p4_nodblligne
movel a5,a6 | src line
movel a5,a1 | dest line
addl c2p_dstpitch,a1
movel c2p_width,d6
lsrw #3,d6
subql #1,d6
c2p4_copydbl:
movel a6@+,a1@+
dbra d6,c2p4_copydbl
addl c2p_dstpitch,a5
c2p4_nodblligne:
| Next line
movel a4,a0
addl c2p_srcpitch,a0
movel a5,a1
addl c2p_dstpitch,a1
dbra d7,c2p4_bcly
moveml sp@+,d2-d7/a2-a6
rts
/* ------------ Conversion of a light palette in 4 bits ------------ */
_SDL_Atari_C2pConvert4_pal:
/* a0 is a 256-word light palette */
movel sp@(4),a0
moveml d2-d3,sp@-
lea _SDL_Atari_table_c2p,a1
movew #255,d3
c2p_pal_initbcl:
movew a0@+,d0
lsrw #4,d0
andw #15,d0
moveq #3,d1
c2p_pal_initbyte:
btst d1,d0
sne d2
negw d2
moveb d2,a1@(0,d1:w)
dbra d1,c2p_pal_initbyte
addql #4,a1
dbra d3,c2p_pal_initbcl
moveml sp@+,d2-d3
rts
/* ------------ Buffers ------------ */
.bss
.even
.comm _SDL_Atari_C2pConvert,4
.comm _SDL_Atari_table_c2p,1024
.comm c2p_source,4 /* Source framebuffer */
.comm c2p_dest,4 /* Destination framebuffer */
.comm c2p_width,4 /* Width of zone to convert */
.comm c2p_height,4 /* Height of zone to convert */
.comm c2p_dblligne,4 /* Double the lines while converting ? */
.comm c2p_srcpitch,4 /* Source pitch */
.comm c2p_dstpitch,4 /* Destination pitch */
.comm c2p_cursrc,4 /* Current source line */
.comm c2p_curdst,4 /* Current destination line */
.comm c2p_rowlen,2 /* Line length in bytes */
.comm c2p_row,2 /* Current line number */
|
