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-rw-r--r--distrib/sdl-1.2.12/src/video/ataricommon/SDL_ataric2p.S447
1 files changed, 447 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.12/src/video/ataricommon/SDL_ataric2p.S b/distrib/sdl-1.2.12/src/video/ataricommon/SDL_ataric2p.S
new file mode 100644
index 0000000..48012b3
--- /dev/null
+++ b/distrib/sdl-1.2.12/src/video/ataricommon/SDL_ataric2p.S
@@ -0,0 +1,447 @@
+/*
+ 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_rowlen
+
+SDL_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_start
+
+SDL_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,d7
+SDL_Atari_C2p8_dblloop:
+ movel a0@+,a1@+
+ movel a0@+,a1@+
+ movel a0@+,a1@+
+ movel a0@+,a1@+
+ dbra d7,SDL_Atari_C2p8_dblloop
+
+ addl d1,c2p_curdst
+
+SDL_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,d7
+c2p4_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,d6
+c2p4_bclx:
+ | Octets 0-7
+
+ moveq #0,d1
+ moveq #7,d5
+c2p4_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,d5
+c2p4_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,d6
+c2p4_copydbl:
+ movel a6@+,a1@+
+ dbra d6,c2p4_copydbl
+
+ addl c2p_dstpitch,a5
+c2p4_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,d3
+c2p_pal_initbcl:
+ movew a0@+,d0
+ lsrw #4,d0
+ andw #15,d0
+
+ moveq #3,d1
+c2p_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 */