1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 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 #if !defined(__mcoldfire__) 42 movel sp@(4),c2p_source 43 movel sp@(8),c2p_dest 44 movel sp@(12),c2p_width 45 movel sp@(16),c2p_height 46 movel sp@(20),c2p_dblligne 47 movel sp@(24),c2p_srcpitch 48 movel sp@(28),c2p_dstpitch 49 50 moveml d2-d7/a2-a6,sp@- 51 52 movel c2p_source,c2p_cursrc 53 movel c2p_dest,c2p_curdst 54 movel #0x0f0f0f0f,d4 55 movel #0x00ff00ff,d5 56 movel #0x55555555,d6 57 movew c2p_height+2,c2p_row 58 movew c2p_width+2,d0 59 andw #-8,d0 60 movew d0,c2p_rowlen 61 62 SDL_Atari_C2p8_rowloop: 63 64 movel c2p_cursrc,a0 65 movel c2p_curdst,a1 66 67 movel a0,a2 68 addw c2p_rowlen,a2 69 70 movel a0@+,d0 71 movel a0@+,d1 72 movel a0@+,d2 73 movel a0@+,d3 74 /* 75 d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0 76 d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0 77 d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0 78 d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0 79 */ 80 movel d1,d7 81 lsrl #4,d7 82 eorl d0,d7 83 andl d4,d7 84 eorl d7,d0 85 lsll #4,d7 86 eorl d7,d1 87 88 movel d3,d7 89 lsrl #4,d7 90 eorl d2,d7 91 andl d4,d7 92 eorl d7,d2 93 lsll #4,d7 94 eorl d7,d3 95 96 movel d2,d7 97 lsrl #8,d7 98 eorl d0,d7 99 andl d5,d7 100 eorl d7,d0 101 lsll #8,d7 102 eorl d7,d2 103 104 movel d3,d7 105 lsrl #8,d7 106 eorl d1,d7 107 andl d5,d7 108 eorl d7,d1 109 lsll #8,d7 110 eorl d7,d3 111 /* 112 d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4 113 d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0 114 d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4 115 d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0 116 */ 117 bras SDL_Atari_C2p8_start 118 119 SDL_Atari_C2p8_pix16: 120 121 movel a0@+,d0 122 movel a0@+,d1 123 movel a0@+,d2 124 movel a0@+,d3 125 /* 126 d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0 127 d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0 128 d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0 129 d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0 130 */ 131 movel d1,d7 132 lsrl #4,d7 133 movel a3,a1@+ 134 eorl d0,d7 135 andl d4,d7 136 eorl d7,d0 137 lsll #4,d7 138 eorl d7,d1 139 140 movel d3,d7 141 lsrl #4,d7 142 eorl d2,d7 143 andl d4,d7 144 eorl d7,d2 145 movel a4,a1@+ 146 lsll #4,d7 147 eorl d7,d3 148 149 movel d2,d7 150 lsrl #8,d7 151 eorl d0,d7 152 andl d5,d7 153 eorl d7,d0 154 movel a5,a1@+ 155 lsll #8,d7 156 eorl d7,d2 157 158 movel d3,d7 159 lsrl #8,d7 160 eorl d1,d7 161 andl d5,d7 162 eorl d7,d1 163 movel a6,a1@+ 164 lsll #8,d7 165 eorl d7,d3 166 /* 167 d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4 168 d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0 169 d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4 170 d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0 171 */ 172 173 SDL_Atari_C2p8_start: 174 175 movel d2,d7 176 lsrl #1,d7 177 eorl d0,d7 178 andl d6,d7 179 eorl d7,d0 180 addl d7,d7 181 eorl d7,d2 182 183 movel d3,d7 184 lsrl #1,d7 185 eorl d1,d7 186 andl d6,d7 187 eorl d7,d1 188 addl d7,d7 189 eorl d7,d3 190 /* 191 d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5 192 d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1 193 d2 = a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4 194 d3 = a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0 195 */ 196 movew d2,d7 197 movew d0,d2 198 swap d2 199 movew d2,d0 200 movew d7,d2 201 202 movew d3,d7 203 movew d1,d3 204 swap d3 205 movew d3,d1 206 movew d7,d3 207 /* 208 d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4 209 d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0 210 d2 = c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4 211 d3 = c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0 212 */ 213 movel d2,d7 214 lsrl #2,d7 215 eorl d0,d7 216 andl #0x33333333,d7 217 eorl d7,d0 218 lsll #2,d7 219 eorl d7,d2 220 221 movel d3,d7 222 lsrl #2,d7 223 eorl d1,d7 224 andl #0x33333333,d7 225 eorl d7,d1 226 lsll #2,d7 227 eorl d7,d3 228 /* 229 d0 = a7b7c7d7e7f7g7h7 i7j7k7l7m7n7o7p7 a6b6c6d6e6f6g6h6 i6j6k6l6m6n6o6p6 230 d1 = a3b3c3d3e3f3g3h3 i3j3k3l3m3n3o3p3 a2b2c2d2e2f2g2h2 i2j2k2l2m2n2o2p2 231 d2 = a5b5c5d5e5f5g5h5 i5j5k5l5m5n5o5p5 a4b4c4d4e4f4g4h4 i4j4k4l4m4n4o4p4 232 d3 = a1b1c1d1e1f1g1h1 i1j1k1l1m1n1o1p1 a0b0c0d0e0f0g0h0 i0j0k0l0m0n0o0p0 233 */ 234 swap d0 235 swap d1 236 swap d2 237 swap d3 238 239 movel d0,a6 240 movel d2,a5 241 movel d1,a4 242 movel d3,a3 243 244 cmpl a0,a2 245 bgt SDL_Atari_C2p8_pix16 246 247 movel a3,a1@+ 248 movel a4,a1@+ 249 movel a5,a1@+ 250 movel a6,a1@+ 251 252 /* Double the line ? */ 253 254 movel c2p_srcpitch,d0 255 movel c2p_dstpitch,d1 256 257 tstl c2p_dblligne 258 beqs SDL_Atari_C2p8_nodblline 259 260 movel c2p_curdst,a0 261 movel a0,a1 262 addl d1,a1 263 264 movew c2p_width+2,d7 265 lsrw #4,d7 266 subql #1,d7 267 SDL_Atari_C2p8_dblloop: 268 movel a0@+,a1@+ 269 movel a0@+,a1@+ 270 movel a0@+,a1@+ 271 movel a0@+,a1@+ 272 dbra d7,SDL_Atari_C2p8_dblloop 273 274 addl d1,c2p_curdst 275 276 SDL_Atari_C2p8_nodblline: 277 278 /* Next line */ 279 280 addl d0,c2p_cursrc 281 addl d1,c2p_curdst 282 283 subqw #1,c2p_row 284 bne SDL_Atari_C2p8_rowloop 285 286 moveml sp@+,d2-d7/a2-a6 287 #endif 288 rts 289 290 /* ------------ Conversion C2P, 4 bits ------------ */ 291 292 _SDL_Atari_C2pConvert4: 293 #if !defined(__mcoldfire__) 294 movel sp@(4),c2p_source 295 movel sp@(8),c2p_dest 296 movel sp@(12),c2p_width 297 movel sp@(16),c2p_height 298 movel sp@(20),c2p_dblligne 299 movel sp@(24),c2p_srcpitch 300 movel sp@(28),c2p_dstpitch 301 302 moveml d2-d7/a2-a6,sp@- 303 304 movel c2p_source,a0 305 movel c2p_dest,a1 306 lea _SDL_Atari_table_c2p,a2 307 movel #0x00070001,d3 308 #if defined(__mc68020__) 309 moveq #0,d0 310 #endif 311 312 movel c2p_height,d7 313 subql #1,d7 314 c2p4_bcly: 315 movel a0,a4 | Save start address of source 316 movel a1,a5 | Save start address of dest 317 318 | Conversion 319 320 movel c2p_width,d6 321 lsrw #4,d6 322 subql #1,d6 323 c2p4_bclx: 324 | Octets 0-7 325 326 moveq #0,d1 327 moveq #7,d5 328 c2p4_bcl07: 329 #if defined(__mc68020__) 330 moveb a0@+,d0 331 lea a2@(0,d0:w:4),a3 332 #else 333 moveq #0,d0 334 moveb a0@+,d0 335 lslw #2,d0 336 lea a2@(0,d0:w),a3 337 #endif 338 lsll #1,d1 339 orl a3@,d1 340 dbra d5,c2p4_bcl07 341 342 movepl d1,a1@(0) 343 addw d3,a1 344 swap d3 345 346 | Octets 8-15 347 348 moveq #0,d1 349 moveq #7,d5 350 c2p4_bcl815: 351 #if defined(__mc68020__) 352 moveb a0@+,d0 353 lea a2@(0,d0:w:4),a3 354 #else 355 moveq #0,d0 356 moveb a0@+,d0 357 lslw #2,d0 358 lea a2@(0,d0:w),a3 359 #endif 360 lsll #1,d1 361 orl a3@,d1 362 dbra d5,c2p4_bcl815 363 364 movepl d1,a1@(0) 365 addw d3,a1 366 swap d3 367 368 dbra d6,c2p4_bclx 369 370 | Double line ? 371 372 tstl c2p_dblligne 373 beqs c2p4_nodblligne 374 375 movel a5,a6 | src line 376 movel a5,a1 | dest line 377 addl c2p_dstpitch,a1 378 379 movel c2p_width,d6 380 lsrw #3,d6 381 subql #1,d6 382 c2p4_copydbl: 383 movel a6@+,a1@+ 384 dbra d6,c2p4_copydbl 385 386 addl c2p_dstpitch,a5 387 c2p4_nodblligne: 388 389 | Next line 390 391 movel a4,a0 392 addl c2p_srcpitch,a0 393 movel a5,a1 394 addl c2p_dstpitch,a1 395 396 dbra d7,c2p4_bcly 397 398 moveml sp@+,d2-d7/a2-a6 399 #endif 400 rts 401 402 /* ------------ Conversion of a light palette in 4 bits ------------ */ 403 404 _SDL_Atari_C2pConvert4_pal: 405 #if !defined(__mcoldfire__) 406 /* a0 is a 256-word light palette */ 407 movel sp@(4),a0 408 409 moveml d2-d3,sp@- 410 411 lea _SDL_Atari_table_c2p,a1 412 movew #255,d3 413 c2p_pal_initbcl: 414 movew a0@+,d0 415 lsrw #4,d0 416 andw #15,d0 417 418 moveq #3,d1 419 c2p_pal_initbyte: 420 btst d1,d0 421 sne d2 422 negw d2 423 moveb d2,a1@(0,d1:w) 424 425 dbra d1,c2p_pal_initbyte 426 427 addql #4,a1 428 dbra d3,c2p_pal_initbcl 429 430 moveml sp@+,d2-d3 431 #endif 432 rts 433 434 /* ------------ Buffers ------------ */ 435 436 .bss 437 438 .even 439 .comm _SDL_Atari_C2pConvert,4 440 .comm _SDL_Atari_table_c2p,1024 441 442 .comm c2p_source,4 /* Source framebuffer */ 443 .comm c2p_dest,4 /* Destination framebuffer */ 444 .comm c2p_width,4 /* Width of zone to convert */ 445 .comm c2p_height,4 /* Height of zone to convert */ 446 .comm c2p_dblligne,4 /* Double the lines while converting ? */ 447 .comm c2p_srcpitch,4 /* Source pitch */ 448 .comm c2p_dstpitch,4 /* Destination pitch */ 449 .comm c2p_cursrc,4 /* Current source line */ 450 .comm c2p_curdst,4 /* Current destination line */ 451 .comm c2p_rowlen,2 /* Line length in bytes */ 452 .comm c2p_row,2 /* Current line number */ 453
