📄 sdl_ataric2p.s
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/* 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_rowlenSDL_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_startSDL_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,d7SDL_Atari_C2p8_dblloop: movel a0@+,a1@+ movel a0@+,a1@+ movel a0@+,a1@+ movel a0@+,a1@+ dbra d7,SDL_Atari_C2p8_dblloop addl d1,c2p_curdstSDL_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,d7c2p4_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,d6c2p4_bclx: | Octets 0-7 moveq #0,d1 moveq #7,d5c2p4_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,d5c2p4_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,d6c2p4_copydbl: movel a6@+,a1@+ dbra d6,c2p4_copydbl addl c2p_dstpitch,a5c2p4_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,d3c2p_pal_initbcl: movew a0@+,d0 lsrw #4,d0 andw #15,d0 moveq #3,d1c2p_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 */⌨️ 快捷键说明
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