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annotate src/video/ataricommon/SDL_ataric2p060.c @ 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 * for 68060 CPU, without movep instruction
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31 * 1 byte/pixel -> 4 or 8 bit planes
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32 *
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33 * Patrice Mandin
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34 */
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35
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36 #include <string.h>
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37
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38 #include <sys/cookie.h>
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39
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40 #include "SDL_ataric2p_s.h"
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41
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42 /*--- Variables ---*/
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43
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44 /* CPU is 060 ? */
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45 int atari_cpu060_avail;
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46
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47 /*--- Functions ---*/
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48
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49 void atari_test_cpu060_present(void)
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50 {
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51 unsigned long cookie_cpu;
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52
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53 atari_cpu060_avail=0;
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54
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55 /* Cookie _CPU present ? */
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56 if (Getcookie(C__CPU, &cookie_cpu) == C_FOUND) {
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57 atari_cpu060_avail = (cookie_cpu == 60);
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58 }
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59 }
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60
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61 void Atari_C2pConvert8_060(
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62 Uint8 *src, /* Source screen (one byte=one pixel) */
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63 Uint8 *dest, /* Destination (8 bits planes) */
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64 Uint32 width, /* Dimensions of screen to convert */
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65 Uint32 height,
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66 Uint32 dblligne, /* Double the lines when converting ? */
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67 Uint32 srcpitch, /* Length of one source line in bytes */
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68 Uint32 dstpitch /* Length of one destination line in bytes */
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69 )
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70 {
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71 int x,y,z;
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72 Uint8 *src_line, *dst_line;
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73
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74 for (y=0; y<height; y++) {
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75 src_line = src;
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76 dst_line = dest;
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77
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78 for (x=0; x<(width>>4); x++) {
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79 Uint32 somme1, somme2;
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80 Uint32 *convtable;
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81
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82 /* bytes 0-7 */
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83 somme1 = somme2 = 0;
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84 for (z=0; z<8 ;z++) {
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85 convtable = (Uint32 *) &Atari_table_c2p[(*src_line++)<<3];
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86 somme1 <<= 1;
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87 somme2 <<= 1;
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88 somme1 |= *convtable++;
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89 somme2 |= *convtable;
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90 }
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91
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92 *(dst_line+14) = somme2; /* 000000FF */
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93 *(dst_line+6) = somme1; /* 000000FF */
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94 somme2 >>= 8;
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95 somme1 >>= 8;
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96 *(dst_line+12) = somme2; /* 0000FF00 */
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97 *(dst_line+4) = somme1; /* 0000FF00 */
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98 somme2 >>= 8;
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99 somme1 >>= 8;
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100 *(dst_line+10) = somme2; /* 00FF0000 */
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101 *(dst_line+2) = somme1; /* 00FF0000 */
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102 somme2 >>= 8;
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103 somme1 >>= 8;
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104 *(dst_line+8) = somme2; /* FF000000 */
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105 *dst_line++ = somme1; /* FF000000 */
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106
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107 /* bytes 8-15 */
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108 somme1 = somme2 = 0;
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109 for (z=0; z<8 ;z++) {
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110 convtable = (Uint32 *) &Atari_table_c2p[(*src_line++)<<3];
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111 somme1 <<= 1;
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112 somme2 <<= 1;
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113 somme1 |= *convtable++;
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114 somme2 |= *convtable;
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115 }
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116
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117 *(dst_line+14) = somme2; /* 000000FF */
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118 *(dst_line+6) = somme1; /* 000000FF */
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119 somme2 >>= 8;
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120 somme1 >>= 8;
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121 *(dst_line+12) = somme2; /* 0000FF00 */
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122 *(dst_line+4) = somme1; /* 0000FF00 */
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123 somme2 >>= 8;
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124 somme1 >>= 8;
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125 *(dst_line+10) = somme2; /* 00FF0000 */
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126 *(dst_line+2) = somme1; /* 00FF0000 */
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127 somme2 >>= 8;
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128 somme1 >>= 8;
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129 *(dst_line+8) = somme2; /* FF000000 */
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130 *dst_line = somme1; /* FF000000 */
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131
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132 dst_line += 15;
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133 }
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134
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135 if (dblligne) {
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136 memcpy(dest+dstpitch, dest, width);
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137 dest += dstpitch;
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138 }
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139
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140 src += srcpitch;
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141 dest += dstpitch;
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142 }
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143 }
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144
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145 void Atari_C2pConvert4_060(
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146 Uint8 *src, /* Source screen (one byte=one pixel) */
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147 Uint8 *dest, /* Destination (4 bits planes) */
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148 Uint32 width, /* Dimensions of screen to convert */
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149 Uint32 height,
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150 Uint32 dblligne, /* Double the lines when converting ? */
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151 Uint32 srcpitch, /* Length of one source line in bytes */
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152 Uint32 dstpitch /* Length of one destination line in bytes */
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153 )
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154 {
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155 int x,y,z;
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156 Uint8 *src_line, *dst_line;
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157
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158 for (y=0;y<height;y++) {
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159 src_line = src;
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160 dst_line = dest;
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161
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162 for (x=0; x<(width>>4);x++) {
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163 Uint32 somme;
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164 Uint32 *convtable;
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165
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166 /* bytes 0-7 */
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167 somme=0;
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168 for (z=0; z<8 ; z++) {
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169 convtable = (Uint32 *) &Atari_table_c2p[(*src_line++)<<2];
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170 somme <<= 1;
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171 somme |= *convtable;
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172 }
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173
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174 *(dst_line+6) = somme; somme >>= 8; /* 000000FF */
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175 *(dst_line+4) = somme; somme >>= 8; /* 0000FF00 */
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176 *(dst_line+2) = somme; somme >>= 8; /* 00FF0000 */
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177 *dst_line++ = somme; /* FF000000 */
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178
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179 /* bytes 8-15 */
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180 somme = 0;
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181 for (z=0; z<8 ;z++) {
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182 convtable = (Uint32 *) &Atari_table_c2p[(*src_line++)<<2];
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183 somme <<= 1;
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184 somme |= *convtable;
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185 }
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186
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187 *(dst_line+6) = somme; somme >>= 8; /* 000000FF */
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188 *(dst_line+4) = somme; somme >>= 8; /* 0000FF00 */
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189 *(dst_line+2) = somme; somme >>= 8; /* 00FF0000 */
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190 *dst_line = somme; /* FF000000 */
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191
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192 dst_line += 7;
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193 }
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194
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195 if (dblligne) {
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196 memcpy(dest+dstpitch, dest, width>>1);
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197 dest += dstpitch;
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198 }
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199
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200 src += srcpitch;
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201 dest += dstpitch;
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202 }
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203 }