1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2006 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 (at) 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 */ 448
