| 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 */ |
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