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annotate src/video/ataricommon/SDL_ataric2p.S @ 281:c5010ab8ba35

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Added initial support for Atari (thanks Patrice!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 17 Feb 2002 19:54:28 +0000
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children f6ffac90895c
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281
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /*
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29 * Chunky to planar conversion routine
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30 * 1 byte/pixel -> 4 or 8 bit planes
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31 *
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32 * Patrice Mandin
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33 * Xavier Joubert
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34 */
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35
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36 /* ------------ Function pointers ------------ */
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37
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38 .globl _Atari_C2pInit
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39 .globl _Atari_C2pConvert
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40
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41 .data
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42
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43 .even
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44 .comm _Atari_C2pInit,4
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45 .comm _Atari_C2pConvert,4
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46
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47 /* ------------ Conversion Table C2P ------------ */
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48
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49 .globl _Atari_table_c2p
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50
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51 .data
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52
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53 .comm _Atari_table_c2p,2048
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54
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55 /* ------------ Init table C2P, 8 bits ------------ */
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56
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57 .globl _Atari_C2pInit8
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58
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59 .text
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60 _Atari_C2pInit8:
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61 movel d2,sp@-
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62
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63 lea _Atari_table_c2p,a0
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64 movew #255,d0
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65 c2p_initbcl:
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66 #if defined (__M68020__)
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67 lea a0@(0,d0:w:8),a1
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68 #else
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69 movew d0,d2
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70 lslw #3,d2
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71 lea a0@(0,d2:w),a1
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72 #endif
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73 moveq #7,d1
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74 c2p_initbyte:
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75 btst d1,d0
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76 sne d2
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77 negw d2
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78 moveb d2,a1@(0,d1:w)
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79
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80 dbra d1,c2p_initbyte
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81
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82 dbra d0,c2p_initbcl
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83
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84 movel sp@+,d2
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85 rts
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86
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87 /* ------------ Conversion C2P, 8 bits ------------ */
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88
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89 .globl _Atari_C2pConvert8
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90
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91 .text
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92 _Atari_C2pConvert8:
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93 movel sp@(4),c2p_source
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94 movel sp@(8),c2p_dest
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95 movel sp@(12),c2p_width
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96 movel sp@(16),c2p_height
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97 movel sp@(20),c2p_dblligne
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98 movel sp@(24),c2p_srcpitch
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99 movel sp@(28),c2p_dstpitch
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100
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101 moveml d2-d7/a2-a6,sp@-
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102
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103 movel c2p_source,a0
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104 movel c2p_dest,a1
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105 lea _Atari_table_c2p,a2
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106 movel #0x000f0001,d3
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107 #if defined(__M68020__)
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108 moveq #0,d0
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109 #endif
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110
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111 movel c2p_height,d7
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112 subql #1,d7
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113 c2p8_bcly:
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114 movel a0,a4 | Save start address of source
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115 movel a1,a5 | Save start address of dest
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116
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117 | Conversion
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118
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119 movel c2p_width,d6
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120 lsrw #4,d6
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121 subql #1,d6
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122 c2p8_bclx:
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123 | Octets 0-7
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124
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125 moveq #0,d1
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126 moveq #0,d2
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127 moveq #7,d5
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128 c2p8_bcl07:
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129 #if defined(__M68020__)
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130 moveb a0@+,d0
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131 lea a2@(0,d0:w:8),a3
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132 #else
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133 moveq #0,d0
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134 moveb a0@+,d0
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135 lslw #3,d0
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136 lea a2@(0,d0:w),a3
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137 #endif
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138 lsll #1,d1
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139 lsll #1,d2
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140 orl a3@+,d1
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141 orl a3@,d2
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142 dbra d5,c2p8_bcl07
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143
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144 movepl d1,a1@(0)
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145 movepl d2,a1@(8)
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146 addw d3,a1
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parents:
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147 swap d3
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Sam Lantinga <slouken@libsdl.org>
parents:
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148
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Sam Lantinga <slouken@libsdl.org>
parents:
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149 | Octets 8-15
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Sam Lantinga <slouken@libsdl.org>
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150
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Sam Lantinga <slouken@libsdl.org>
parents:
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151 moveq #0,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
152 moveq #0,d2
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
153 moveq #7,d5
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
154 c2p8_bcl815:
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
155 #if defined(__M68020__)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 moveb a0@+,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
157 lea a2@(0,d0:w:8),a3
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
158 #else
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Sam Lantinga <slouken@libsdl.org>
parents:
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159 moveq #0,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
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160 moveb a0@+,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
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161 lslw #3,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
162 lea a2@(0,d0:w),a3
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
163 #endif
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Sam Lantinga <slouken@libsdl.org>
parents:
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164 lsll #1,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
165 lsll #1,d2
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 orl a3@+,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
167 orl a3@,d2
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Sam Lantinga <slouken@libsdl.org>
parents:
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168 dbra d5,c2p8_bcl815
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Sam Lantinga <slouken@libsdl.org>
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169
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Sam Lantinga <slouken@libsdl.org>
parents:
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170 movepl d1,a1@(0)
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Sam Lantinga <slouken@libsdl.org>
parents:
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171 movepl d2,a1@(8)
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Sam Lantinga <slouken@libsdl.org>
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172 addw d3,a1
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Sam Lantinga <slouken@libsdl.org>
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173 swap d3
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Sam Lantinga <slouken@libsdl.org>
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174
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
175 dbra d6,c2p8_bclx
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Sam Lantinga <slouken@libsdl.org>
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176
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Sam Lantinga <slouken@libsdl.org>
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177 | Double line ?
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Sam Lantinga <slouken@libsdl.org>
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178
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Sam Lantinga <slouken@libsdl.org>
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179 tstl c2p_dblligne
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Sam Lantinga <slouken@libsdl.org>
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180 beq c2p8_nodblligne
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Sam Lantinga <slouken@libsdl.org>
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181
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Sam Lantinga <slouken@libsdl.org>
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182 movel a5,a6 | src line
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Sam Lantinga <slouken@libsdl.org>
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183 movel a5,a1 | dest line
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Sam Lantinga <slouken@libsdl.org>
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184 addl c2p_dstpitch,a1
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Sam Lantinga <slouken@libsdl.org>
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185
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Sam Lantinga <slouken@libsdl.org>
parents:
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186 movel c2p_width,d6
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Sam Lantinga <slouken@libsdl.org>
parents:
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187 lsrw #2,d6
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Sam Lantinga <slouken@libsdl.org>
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188 subql #1,d6
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Sam Lantinga <slouken@libsdl.org>
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189 c2p8_copydbl:
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Sam Lantinga <slouken@libsdl.org>
parents:
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190 movel a6@+,a1@+
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 dbra d6,c2p8_copydbl
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Sam Lantinga <slouken@libsdl.org>
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192
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Sam Lantinga <slouken@libsdl.org>
parents:
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193 addl c2p_dstpitch,a5
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Sam Lantinga <slouken@libsdl.org>
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194 c2p8_nodblligne:
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Sam Lantinga <slouken@libsdl.org>
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195
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Sam Lantinga <slouken@libsdl.org>
parents:
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196 | Next line
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Sam Lantinga <slouken@libsdl.org>
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197
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Sam Lantinga <slouken@libsdl.org>
parents:
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198 movel a4,a0
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Sam Lantinga <slouken@libsdl.org>
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199 addl c2p_srcpitch,a0
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Sam Lantinga <slouken@libsdl.org>
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200 movel a5,a1
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Sam Lantinga <slouken@libsdl.org>
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201 addl c2p_dstpitch,a1
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Sam Lantinga <slouken@libsdl.org>
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202
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203 dbra d7,c2p8_bcly
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Sam Lantinga <slouken@libsdl.org>
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204
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Sam Lantinga <slouken@libsdl.org>
parents:
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205 moveml sp@+,d2-d7/a2-a6
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Sam Lantinga <slouken@libsdl.org>
parents:
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206 rts
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Sam Lantinga <slouken@libsdl.org>
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207
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Sam Lantinga <slouken@libsdl.org>
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208 /* ------------ Init table C2P, 4 bits ------------ */
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209
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Sam Lantinga <slouken@libsdl.org>
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210 .globl _Atari_C2pInit4
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211
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Sam Lantinga <slouken@libsdl.org>
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212 .text
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Sam Lantinga <slouken@libsdl.org>
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213 _Atari_C2pInit4:
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Sam Lantinga <slouken@libsdl.org>
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214 /* Nothing to do */
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Sam Lantinga <slouken@libsdl.org>
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215 /* work is done in convert_c2p_pal */
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Sam Lantinga <slouken@libsdl.org>
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216 rts
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Sam Lantinga <slouken@libsdl.org>
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217
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Sam Lantinga <slouken@libsdl.org>
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218 /* ------------ Conversion C2P, 4 bits ------------ */
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219
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Sam Lantinga <slouken@libsdl.org>
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220 .globl _Atari_C2pConvert4
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Sam Lantinga <slouken@libsdl.org>
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221
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Sam Lantinga <slouken@libsdl.org>
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222 .text
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Sam Lantinga <slouken@libsdl.org>
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223 _Atari_C2pConvert4:
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Sam Lantinga <slouken@libsdl.org>
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224 movel sp@(4),c2p_source
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Sam Lantinga <slouken@libsdl.org>
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225 movel sp@(8),c2p_dest
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Sam Lantinga <slouken@libsdl.org>
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226 movel sp@(12),c2p_width
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
227 movel sp@(16),c2p_height
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Sam Lantinga <slouken@libsdl.org>
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228 movel sp@(20),c2p_dblligne
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
229 movel sp@(24),c2p_srcpitch
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
230 movel sp@(28),c2p_dstpitch
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Sam Lantinga <slouken@libsdl.org>
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231
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 moveml d2-d7/a2-a6,sp@-
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Sam Lantinga <slouken@libsdl.org>
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233
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Sam Lantinga <slouken@libsdl.org>
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234 movel c2p_source,a0
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Sam Lantinga <slouken@libsdl.org>
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235 movel c2p_dest,a1
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
236 lea _Atari_table_c2p,a2
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
237 movel #0x00070001,d3
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
238 #if defined(__M68020__)
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Sam Lantinga <slouken@libsdl.org>
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239 moveq #0,d0
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Sam Lantinga <slouken@libsdl.org>
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240 #endif
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Sam Lantinga <slouken@libsdl.org>
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241
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Sam Lantinga <slouken@libsdl.org>
parents:
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242 movel c2p_height,d7
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
243 subql #1,d7
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Sam Lantinga <slouken@libsdl.org>
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244 c2p4_bcly:
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Sam Lantinga <slouken@libsdl.org>
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245 movel a0,a4 | Save start address of source
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
246 movel a1,a5 | Save start address of dest
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Sam Lantinga <slouken@libsdl.org>
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247
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Sam Lantinga <slouken@libsdl.org>
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248 | Conversion
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Sam Lantinga <slouken@libsdl.org>
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249
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Sam Lantinga <slouken@libsdl.org>
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250 movel c2p_width,d6
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Sam Lantinga <slouken@libsdl.org>
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251 lsrw #4,d6
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 subql #1,d6
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Sam Lantinga <slouken@libsdl.org>
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253 c2p4_bclx:
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Sam Lantinga <slouken@libsdl.org>
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254 | Octets 0-7
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Sam Lantinga <slouken@libsdl.org>
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255
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Sam Lantinga <slouken@libsdl.org>
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256 moveq #0,d1
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Sam Lantinga <slouken@libsdl.org>
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257 moveq #7,d5
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Sam Lantinga <slouken@libsdl.org>
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258 c2p4_bcl07:
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259 #if defined(__M68020__)
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Sam Lantinga <slouken@libsdl.org>
parents:
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260 moveb a0@+,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
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261 lea a2@(0,d0:w:4),a3
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Sam Lantinga <slouken@libsdl.org>
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262 #else
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Sam Lantinga <slouken@libsdl.org>
parents:
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263 moveq #0,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
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264 moveb a0@+,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
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265 lslw #2,d0
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Sam Lantinga <slouken@libsdl.org>
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266 lea a2@(0,d0:w),a3
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
267 #endif
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Sam Lantinga <slouken@libsdl.org>
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268 lsll #1,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
269 orl a3@,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
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270 dbra d5,c2p4_bcl07
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Sam Lantinga <slouken@libsdl.org>
parents:
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271
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Sam Lantinga <slouken@libsdl.org>
parents:
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272 movepl d1,a1@(0)
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Sam Lantinga <slouken@libsdl.org>
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273 addw d3,a1
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Sam Lantinga <slouken@libsdl.org>
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274 swap d3
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Sam Lantinga <slouken@libsdl.org>
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275
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Sam Lantinga <slouken@libsdl.org>
parents:
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276 | Octets 8-15
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Sam Lantinga <slouken@libsdl.org>
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277
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Sam Lantinga <slouken@libsdl.org>
parents:
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278 moveq #0,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
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279 moveq #7,d5
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Sam Lantinga <slouken@libsdl.org>
parents:
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280 c2p4_bcl815:
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
281 #if defined(__M68020__)
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Sam Lantinga <slouken@libsdl.org>
parents:
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282 moveb a0@+,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
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283 lea a2@(0,d0:w:4),a3
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Sam Lantinga <slouken@libsdl.org>
parents:
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284 #else
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Sam Lantinga <slouken@libsdl.org>
parents:
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285 moveq #0,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
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286 moveb a0@+,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
287 lslw #2,d0
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
288 lea a2@(0,d0:w),a3
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
289 #endif
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
290 lsll #1,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
291 orl a3@,d1
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
292 dbra d5,c2p4_bcl815
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Sam Lantinga <slouken@libsdl.org>
parents:
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293
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
294 movepl d1,a1@(0)
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295 addw d3,a1
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296 swap d3
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297
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298 dbra d6,c2p4_bclx
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299
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300 | Double line ?
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301
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302 tstl c2p_dblligne
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303 beq c2p4_nodblligne
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304
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Sam Lantinga <slouken@libsdl.org>
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305 movel a5,a6 | src line
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306 movel a5,a1 | dest line
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307 addl c2p_dstpitch,a1
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308
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Sam Lantinga <slouken@libsdl.org>
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309 movel c2p_width,d6
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310 lsrw #3,d6
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Sam Lantinga <slouken@libsdl.org>
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311 subql #1,d6
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312 c2p4_copydbl:
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313 movel a6@+,a1@+
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Sam Lantinga <slouken@libsdl.org>
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314 dbra d6,c2p4_copydbl
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315
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Sam Lantinga <slouken@libsdl.org>
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316 addl c2p_dstpitch,a5
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317 c2p4_nodblligne:
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318
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319 | Next line
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320
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321 movel a4,a0
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Sam Lantinga <slouken@libsdl.org>
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322 addl c2p_srcpitch,a0
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Sam Lantinga <slouken@libsdl.org>
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323 movel a5,a1
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Sam Lantinga <slouken@libsdl.org>
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324 addl c2p_dstpitch,a1
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325
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Sam Lantinga <slouken@libsdl.org>
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326 dbra d7,c2p4_bcly
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327
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Sam Lantinga <slouken@libsdl.org>
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328 moveml sp@+,d2-d7/a2-a6
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329 rts
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330
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331 * ------------ Conversion of a light palette in 4 bits ------------ */
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332
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333 .globl _Atari_C2pConvert4_pal
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334
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335 .text
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336 _Atari_C2pConvert4_pal:
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337 /* a0 is a 256-word light palette */
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338 movel sp@(4),a0
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339
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340 moveml d2-d3,sp@-
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341
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Sam Lantinga <slouken@libsdl.org>
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342 lea _Atari_table_c2p,a1
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Sam Lantinga <slouken@libsdl.org>
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343 movew #255,d3
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Sam Lantinga <slouken@libsdl.org>
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344 c2p_pal_initbcl:
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Sam Lantinga <slouken@libsdl.org>
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345 movew a0@+,d0
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346 lsrw #4,d0
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Sam Lantinga <slouken@libsdl.org>
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347 and #15,d0
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348
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349 moveq #3,d1
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350 c2p_pal_initbyte:
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351 btst d1,d0
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Sam Lantinga <slouken@libsdl.org>
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352 sne d2
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Sam Lantinga <slouken@libsdl.org>
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353 negw d2
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Sam Lantinga <slouken@libsdl.org>
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354 moveb d2,a1@(0,d1:w)
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355
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Sam Lantinga <slouken@libsdl.org>
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356 dbra d1,c2p_pal_initbyte
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357
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Sam Lantinga <slouken@libsdl.org>
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358 addql #4,a1
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Sam Lantinga <slouken@libsdl.org>
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359 dbra d3,c2p_pal_initbcl
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360
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Sam Lantinga <slouken@libsdl.org>
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361 moveml sp@+,d2-d3
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362
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Sam Lantinga <slouken@libsdl.org>
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363 rts
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Sam Lantinga <slouken@libsdl.org>
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364
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Sam Lantinga <slouken@libsdl.org>
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365 /* ------------ Buffers ------------ */
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366
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Sam Lantinga <slouken@libsdl.org>
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367 .data
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368
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369 .even
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Sam Lantinga <slouken@libsdl.org>
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370 .comm c2p_source,4
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Sam Lantinga <slouken@libsdl.org>
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371 .comm c2p_dest,4
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Sam Lantinga <slouken@libsdl.org>
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372 .comm c2p_width,4
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Sam Lantinga <slouken@libsdl.org>
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373 .comm c2p_height,4
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Sam Lantinga <slouken@libsdl.org>
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374 .comm c2p_dblligne,4
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Sam Lantinga <slouken@libsdl.org>
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375 .comm c2p_srcpitch,4
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Sam Lantinga <slouken@libsdl.org>
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376 .comm c2p_dstpitch,4
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377