e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | This library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with this library; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | |
23 | /* |
24 | Chunky to planar conversion routine |
25 | 1 byte/pixel -> 4 or 8 bit planes |
26 | |
27 | Patrice Mandin |
28 | Xavier Joubert |
29 | Mikael Kalms |
30 | */ |
31 | |
32 | .globl _SDL_Atari_C2pConvert |
33 | .globl _SDL_Atari_C2pConvert8 |
34 | .globl _SDL_Atari_C2pConvert4 |
35 | .globl _SDL_Atari_C2pConvert4_pal |
36 | |
37 | /* ------------ Conversion C2P, 8 bits ------------ */ |
38 | |
39 | .text |
40 | _SDL_Atari_C2pConvert8: |
41 | movel sp@(4),c2p_source |
42 | movel sp@(8),c2p_dest |
43 | movel sp@(12),c2p_width |
44 | movel sp@(16),c2p_height |
45 | movel sp@(20),c2p_dblligne |
46 | movel sp@(24),c2p_srcpitch |
47 | movel sp@(28),c2p_dstpitch |
48 | |
49 | moveml d2-d7/a2-a6,sp@- |
50 | |
51 | movel c2p_source,c2p_cursrc |
52 | movel c2p_dest,c2p_curdst |
53 | movel #0x0f0f0f0f,d4 |
54 | movel #0x00ff00ff,d5 |
55 | movel #0x55555555,d6 |
56 | movew c2p_height+2,c2p_row |
57 | movew c2p_width+2,d0 |
58 | andw #-8,d0 |
59 | movew d0,c2p_rowlen |
60 | |
61 | SDL_Atari_C2p8_rowloop: |
62 | |
63 | movel c2p_cursrc,a0 |
64 | movel c2p_curdst,a1 |
65 | |
66 | movel a0,a2 |
67 | addw c2p_rowlen,a2 |
68 | |
69 | movel a0@+,d0 |
70 | movel a0@+,d1 |
71 | movel a0@+,d2 |
72 | movel a0@+,d3 |
73 | /* |
74 | d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0 |
75 | d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0 |
76 | d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0 |
77 | d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0 |
78 | */ |
79 | movel d1,d7 |
80 | lsrl #4,d7 |
81 | eorl d0,d7 |
82 | andl d4,d7 |
83 | eorl d7,d0 |
84 | lsll #4,d7 |
85 | eorl d7,d1 |
86 | |
87 | movel d3,d7 |
88 | lsrl #4,d7 |
89 | eorl d2,d7 |
90 | andl d4,d7 |
91 | eorl d7,d2 |
92 | lsll #4,d7 |
93 | eorl d7,d3 |
94 | |
95 | movel d2,d7 |
96 | lsrl #8,d7 |
97 | eorl d0,d7 |
98 | andl d5,d7 |
99 | eorl d7,d0 |
100 | lsll #8,d7 |
101 | eorl d7,d2 |
102 | |
103 | movel d3,d7 |
104 | lsrl #8,d7 |
105 | eorl d1,d7 |
106 | andl d5,d7 |
107 | eorl d7,d1 |
108 | lsll #8,d7 |
109 | eorl d7,d3 |
110 | /* |
111 | d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4 |
112 | d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0 |
113 | d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4 |
114 | d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0 |
115 | */ |
116 | bras SDL_Atari_C2p8_start |
117 | |
118 | SDL_Atari_C2p8_pix16: |
119 | |
120 | movel a0@+,d0 |
121 | movel a0@+,d1 |
122 | movel a0@+,d2 |
123 | movel a0@+,d3 |
124 | /* |
125 | d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0 |
126 | d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0 |
127 | d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0 |
128 | d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0 |
129 | */ |
130 | movel d1,d7 |
131 | lsrl #4,d7 |
132 | movel a3,a1@+ |
133 | eorl d0,d7 |
134 | andl d4,d7 |
135 | eorl d7,d0 |
136 | lsll #4,d7 |
137 | eorl d7,d1 |
138 | |
139 | movel d3,d7 |
140 | lsrl #4,d7 |
141 | eorl d2,d7 |
142 | andl d4,d7 |
143 | eorl d7,d2 |
144 | movel a4,a1@+ |
145 | lsll #4,d7 |
146 | eorl d7,d3 |
147 | |
148 | movel d2,d7 |
149 | lsrl #8,d7 |
150 | eorl d0,d7 |
151 | andl d5,d7 |
152 | eorl d7,d0 |
153 | movel a5,a1@+ |
154 | lsll #8,d7 |
155 | eorl d7,d2 |
156 | |
157 | movel d3,d7 |
158 | lsrl #8,d7 |
159 | eorl d1,d7 |
160 | andl d5,d7 |
161 | eorl d7,d1 |
162 | movel a6,a1@+ |
163 | lsll #8,d7 |
164 | eorl d7,d3 |
165 | /* |
166 | d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4 |
167 | d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0 |
168 | d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4 |
169 | d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0 |
170 | */ |
171 | |
172 | SDL_Atari_C2p8_start: |
173 | |
174 | movel d2,d7 |
175 | lsrl #1,d7 |
176 | eorl d0,d7 |
177 | andl d6,d7 |
178 | eorl d7,d0 |
179 | addl d7,d7 |
180 | eorl d7,d2 |
181 | |
182 | movel d3,d7 |
183 | lsrl #1,d7 |
184 | eorl d1,d7 |
185 | andl d6,d7 |
186 | eorl d7,d1 |
187 | addl d7,d7 |
188 | eorl d7,d3 |
189 | /* |
190 | d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5 |
191 | d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1 |
192 | d2 = a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4 |
193 | d3 = a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0 |
194 | */ |
195 | movew d2,d7 |
196 | movew d0,d2 |
197 | swap d2 |
198 | movew d2,d0 |
199 | movew d7,d2 |
200 | |
201 | movew d3,d7 |
202 | movew d1,d3 |
203 | swap d3 |
204 | movew d3,d1 |
205 | movew d7,d3 |
206 | /* |
207 | d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4 |
208 | d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0 |
209 | d2 = c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4 |
210 | d3 = c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0 |
211 | */ |
212 | movel d2,d7 |
213 | lsrl #2,d7 |
214 | eorl d0,d7 |
215 | andl #0x33333333,d7 |
216 | eorl d7,d0 |
217 | lsll #2,d7 |
218 | eorl d7,d2 |
219 | |
220 | movel d3,d7 |
221 | lsrl #2,d7 |
222 | eorl d1,d7 |
223 | andl #0x33333333,d7 |
224 | eorl d7,d1 |
225 | lsll #2,d7 |
226 | eorl d7,d3 |
227 | /* |
228 | d0 = a7b7c7d7e7f7g7h7 i7j7k7l7m7n7o7p7 a6b6c6d6e6f6g6h6 i6j6k6l6m6n6o6p6 |
229 | d1 = a3b3c3d3e3f3g3h3 i3j3k3l3m3n3o3p3 a2b2c2d2e2f2g2h2 i2j2k2l2m2n2o2p2 |
230 | d2 = a5b5c5d5e5f5g5h5 i5j5k5l5m5n5o5p5 a4b4c4d4e4f4g4h4 i4j4k4l4m4n4o4p4 |
231 | d3 = a1b1c1d1e1f1g1h1 i1j1k1l1m1n1o1p1 a0b0c0d0e0f0g0h0 i0j0k0l0m0n0o0p0 |
232 | */ |
233 | swap d0 |
234 | swap d1 |
235 | swap d2 |
236 | swap d3 |
237 | |
238 | movel d0,a6 |
239 | movel d2,a5 |
240 | movel d1,a4 |
241 | movel d3,a3 |
242 | |
243 | cmpl a0,a2 |
244 | bgt SDL_Atari_C2p8_pix16 |
245 | |
246 | movel a3,a1@+ |
247 | movel a4,a1@+ |
248 | movel a5,a1@+ |
249 | movel a6,a1@+ |
250 | |
251 | /* Double the line ? */ |
252 | |
253 | movel c2p_srcpitch,d0 |
254 | movel c2p_dstpitch,d1 |
255 | |
256 | tstl c2p_dblligne |
257 | beqs SDL_Atari_C2p8_nodblline |
258 | |
259 | movel c2p_curdst,a0 |
260 | movel a0,a1 |
261 | addl d1,a1 |
262 | |
263 | movew c2p_width+2,d7 |
264 | lsrw #4,d7 |
265 | subql #1,d7 |
266 | SDL_Atari_C2p8_dblloop: |
267 | movel a0@+,a1@+ |
268 | movel a0@+,a1@+ |
269 | movel a0@+,a1@+ |
270 | movel a0@+,a1@+ |
271 | dbra d7,SDL_Atari_C2p8_dblloop |
272 | |
273 | addl d1,c2p_curdst |
274 | |
275 | SDL_Atari_C2p8_nodblline: |
276 | |
277 | /* Next line */ |
278 | |
279 | addl d0,c2p_cursrc |
280 | addl d1,c2p_curdst |
281 | |
282 | subqw #1,c2p_row |
283 | bne SDL_Atari_C2p8_rowloop |
284 | |
285 | moveml sp@+,d2-d7/a2-a6 |
286 | rts |
287 | |
288 | /* ------------ Conversion C2P, 4 bits ------------ */ |
289 | |
290 | _SDL_Atari_C2pConvert4: |
291 | movel sp@(4),c2p_source |
292 | movel sp@(8),c2p_dest |
293 | movel sp@(12),c2p_width |
294 | movel sp@(16),c2p_height |
295 | movel sp@(20),c2p_dblligne |
296 | movel sp@(24),c2p_srcpitch |
297 | movel sp@(28),c2p_dstpitch |
298 | |
299 | moveml d2-d7/a2-a6,sp@- |
300 | |
301 | movel c2p_source,a0 |
302 | movel c2p_dest,a1 |
303 | lea _SDL_Atari_table_c2p,a2 |
304 | movel #0x00070001,d3 |
305 | #if defined(__M68020__) |
306 | moveq #0,d0 |
307 | #endif |
308 | |
309 | movel c2p_height,d7 |
310 | subql #1,d7 |
311 | c2p4_bcly: |
312 | movel a0,a4 | Save start address of source |
313 | movel a1,a5 | Save start address of dest |
314 | |
315 | | Conversion |
316 | |
317 | movel c2p_width,d6 |
318 | lsrw #4,d6 |
319 | subql #1,d6 |
320 | c2p4_bclx: |
321 | | Octets 0-7 |
322 | |
323 | moveq #0,d1 |
324 | moveq #7,d5 |
325 | c2p4_bcl07: |
326 | #if defined(__M68020__) |
327 | moveb a0@+,d0 |
328 | lea a2@(0,d0:w:4),a3 |
329 | #else |
330 | moveq #0,d0 |
331 | moveb a0@+,d0 |
332 | lslw #2,d0 |
333 | lea a2@(0,d0:w),a3 |
334 | #endif |
335 | lsll #1,d1 |
336 | orl a3@,d1 |
337 | dbra d5,c2p4_bcl07 |
338 | |
339 | movepl d1,a1@(0) |
340 | addw d3,a1 |
341 | swap d3 |
342 | |
343 | | Octets 8-15 |
344 | |
345 | moveq #0,d1 |
346 | moveq #7,d5 |
347 | c2p4_bcl815: |
348 | #if defined(__M68020__) |
349 | moveb a0@+,d0 |
350 | lea a2@(0,d0:w:4),a3 |
351 | #else |
352 | moveq #0,d0 |
353 | moveb a0@+,d0 |
354 | lslw #2,d0 |
355 | lea a2@(0,d0:w),a3 |
356 | #endif |
357 | lsll #1,d1 |
358 | orl a3@,d1 |
359 | dbra d5,c2p4_bcl815 |
360 | |
361 | movepl d1,a1@(0) |
362 | addw d3,a1 |
363 | swap d3 |
364 | |
365 | dbra d6,c2p4_bclx |
366 | |
367 | | Double line ? |
368 | |
369 | tstl c2p_dblligne |
370 | beqs c2p4_nodblligne |
371 | |
372 | movel a5,a6 | src line |
373 | movel a5,a1 | dest line |
374 | addl c2p_dstpitch,a1 |
375 | |
376 | movel c2p_width,d6 |
377 | lsrw #3,d6 |
378 | subql #1,d6 |
379 | c2p4_copydbl: |
380 | movel a6@+,a1@+ |
381 | dbra d6,c2p4_copydbl |
382 | |
383 | addl c2p_dstpitch,a5 |
384 | c2p4_nodblligne: |
385 | |
386 | | Next line |
387 | |
388 | movel a4,a0 |
389 | addl c2p_srcpitch,a0 |
390 | movel a5,a1 |
391 | addl c2p_dstpitch,a1 |
392 | |
393 | dbra d7,c2p4_bcly |
394 | |
395 | moveml sp@+,d2-d7/a2-a6 |
396 | rts |
397 | |
398 | /* ------------ Conversion of a light palette in 4 bits ------------ */ |
399 | |
400 | _SDL_Atari_C2pConvert4_pal: |
401 | /* a0 is a 256-word light palette */ |
402 | movel sp@(4),a0 |
403 | |
404 | moveml d2-d3,sp@- |
405 | |
406 | lea _SDL_Atari_table_c2p,a1 |
407 | movew #255,d3 |
408 | c2p_pal_initbcl: |
409 | movew a0@+,d0 |
410 | lsrw #4,d0 |
411 | andw #15,d0 |
412 | |
413 | moveq #3,d1 |
414 | c2p_pal_initbyte: |
415 | btst d1,d0 |
416 | sne d2 |
417 | negw d2 |
418 | moveb d2,a1@(0,d1:w) |
419 | |
420 | dbra d1,c2p_pal_initbyte |
421 | |
422 | addql #4,a1 |
423 | dbra d3,c2p_pal_initbcl |
424 | |
425 | moveml sp@+,d2-d3 |
426 | |
427 | rts |
428 | |
429 | /* ------------ Buffers ------------ */ |
430 | |
431 | .bss |
432 | |
433 | .even |
434 | .comm _SDL_Atari_C2pConvert,4 |
435 | .comm _SDL_Atari_table_c2p,1024 |
436 | |
437 | .comm c2p_source,4 /* Source framebuffer */ |
438 | .comm c2p_dest,4 /* Destination framebuffer */ |
439 | .comm c2p_width,4 /* Width of zone to convert */ |
440 | .comm c2p_height,4 /* Height of zone to convert */ |
441 | .comm c2p_dblligne,4 /* Double the lines while converting ? */ |
442 | .comm c2p_srcpitch,4 /* Source pitch */ |
443 | .comm c2p_dstpitch,4 /* Destination pitch */ |
444 | .comm c2p_cursrc,4 /* Current source line */ |
445 | .comm c2p_curdst,4 /* Current destination line */ |
446 | .comm c2p_rowlen,2 /* Line length in bytes */ |
447 | .comm c2p_row,2 /* Current line number */ |