1 | /*
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2 | =============================================================================
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3 | scadv.c -- MIDAS-VII -- move score 1 frame forward or backward
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4 | Version 48 -- 1989-12-19 -- D.N. Lynx Crowe
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5 | =============================================================================
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6 | */
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7 |
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8 | #undef DEBUGGER /* define to enable debug trace */
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9 |
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10 | #undef TRACEIT /* define to enable step by step trace */
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11 |
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12 | #include "ram.h"
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13 |
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14 | #ifdef TRACEIT
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15 | short tracesw;
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16 | #endif
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17 |
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18 | /* initialized stuff */
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19 |
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20 | int16_t nbmoff = 3;
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21 | int16_t wrdoff = 3;
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22 |
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23 | int16_t nbmasks[4] = { /* nybble masks */
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24 |
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25 | 0x000F,
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26 | 0x00F0,
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27 | 0x0F00,
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28 | 0xF000
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29 | };
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30 |
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31 | /* |
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32 |
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33 | */
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34 |
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35 | /*
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36 | =============================================================================
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37 | sc_adv() -- advance the score display 1 frame
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38 |
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39 | Note that the score display actually only moves every other frame,
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40 | due to VSDD limitations, but it moves 2 pixels.
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41 | =============================================================================
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42 | */
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43 |
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44 | void sc_adv(void)
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45 | {
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46 | register int16_t masksl, maskpx, i;
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47 | register uint16_t sword;
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48 | register int32_t tl;
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49 | register uint16_t *optr, *pptr, *fsl;
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50 | uint16_t *qptr;
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51 | uint16_t pscrl;
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52 |
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53 | DB_ENTR("sc_adv");
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54 |
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55 | #ifdef TRACEIT
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56 | if (tracesw) {
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57 |
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58 | printf("scadv ----------------------\n");
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59 | SEctrl();
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60 | }
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61 |
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62 | if (tracesw & 0x0001) {
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63 |
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64 | SCslice();
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65 | }
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66 | #endif
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67 |
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68 | if (v_regs[5] & 0x0180) /* make sure we're in bank 0 */
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69 | vbank(0);
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70 |
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71 | tl = 128L; /* setup VSDD line increment */
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72 |
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73 | DB_CMNT("sc_adv - center ucslice");
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74 |
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75 | ucslice(); /* update the center slice */
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76 |
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77 | /* |
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78 |
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79 | */
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80 | /* see if it's time to update VRAM from edges */
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81 |
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82 | if ((ndisp EQ 2) AND (soffset EQ ((sd EQ D_BAK) ? 0 : 3))) {
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83 |
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84 | if (sd EQ D_BAK) { /* set source and target pointers */
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85 |
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86 | fsl = prvsl;
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87 | optr = saddr + wrdoff;
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88 |
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89 | } else {
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90 |
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91 | fsl = nxtsl;
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92 | optr = saddr + tl;
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93 | }
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94 |
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95 | if (sbase > 28544) { /* possible double update ? */
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96 |
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97 | /* set target pointer #2 */
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98 |
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99 | pptr = saddr - ((sd EQ D_BAK) ? 28542L : 28545L);
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100 |
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101 | if (sbase < 28672) { /* double update - right and left */
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102 |
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103 | DB_CMNT("sc_adv - double update");
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104 |
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105 | for (i = 224; i--; ) {
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106 |
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107 | sword = *fsl++; /* copy a slice word to the VSDD */
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108 | *optr = sword;
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109 | *pptr = sword;
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110 | optr += tl; /* advance the VSDD pointers */
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111 | pptr += tl;
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112 | }
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113 |
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114 | } else { /* single update - left */
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115 |
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116 | DB_CMNT("sc_adv - left update");
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117 |
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118 | for (i = 224; i--; ) {
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119 |
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120 | *pptr = *fsl++; /* copy a slice word to the VSDD */
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121 | pptr += tl; /* advance the VSDD pointers */
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122 | }
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123 | }
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124 | /* |
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125 |
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126 | */
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127 | } else { /* single update - right */
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128 |
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129 | DB_CMNT("sc_adv - right update");
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130 |
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131 | for (i = 224; i--; ) {
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132 |
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133 | *optr = *fsl++; /* copy a slice word to the VSDD */
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134 | optr += tl; /* advance the VSDD pointers */
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135 | }
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136 | }
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137 |
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138 | optr = nxtsl; /* refresh update slices from constant slice */
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139 | pptr = cursl;
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140 | qptr = prvsl;
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141 | fsl = consl;
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142 |
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143 | for (i = 224; i--; ) {
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144 |
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145 | sword = *fsl++;
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146 | *optr++ = sword;
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147 | *pptr++ = sword;
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148 | *qptr++ = sword;
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149 | }
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150 |
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151 | DB_CMNT("sc_adv - slices refreshed");
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152 | }
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153 |
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154 | /* |
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155 |
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156 | */
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157 | if (sd EQ D_FWD) {
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158 |
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159 | if (++soffset > 3) { /* advance scroll counter */
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160 |
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161 | soffset = 0; /* roll over scroll counter */
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162 | ++saddr; /* advance VRAM address */
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163 |
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164 | if (++sbase > 28672) { /* advance scroll offset */
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165 |
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166 | saddr = v_score; /* roll over VRAM address */
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167 | sbase = 0; /* roll over scroll offset */
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168 | }
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169 | }
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170 |
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171 | } else {
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172 |
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173 | if (--soffset < 0) { /* decrement scroll counter */
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174 |
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175 | soffset = 3; /* roll over scroll counter */
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176 | --saddr; /* advance VRAM address */
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177 |
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178 | if (--sbase < 0) { /* advance scroll offset */
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179 |
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180 | saddr = v_score + 28672L; /* roll over VRAM address */
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181 | sbase = 28672; /* roll over scroll offset */
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182 | }
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183 | }
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184 | }
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185 | /* |
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186 |
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187 | */
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188 | pscrl = scrl; /* save old scrl value */
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189 |
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190 | DB_CMNT("sc_adv - edge uslice");
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191 |
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192 | maskpx = nbmasks[soffset]; /* setup source pixel mask */
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193 | masksl = ~maskpx; /* setup target pixel mask */
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194 |
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195 | uslice(prvsl, maskpx, masksl, gdstbp); /* update left edge */
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196 |
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197 | uslice(nxtsl, maskpx, masksl, gdstbn); /* update right edge */
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198 |
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199 | scrl = 0x8000 | ((soffset >> 1) ^ 0x0001);
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200 |
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201 | /* only update VSDD registers if score is up and scrl changed */
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202 |
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203 | if ((ndisp EQ 2) AND (scrl NE pscrl)) {
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204 |
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205 | sword = (uint16_t)((int32_t)saddr >> 1);
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206 |
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207 | setipl(VID_DI); /* disable video interrupts */
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208 |
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209 | vi_scrl = scrl;
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210 | vi_sadr = sword;
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211 |
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212 | setipl(VID_EI); /* enable video interrupts */
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213 | }
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214 |
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215 | ctrsw = FALSE;
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216 |
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217 | #ifdef TRACEIT
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218 | if (tracesw & 0x0002) {
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219 |
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220 | SCslice();
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221 | }
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222 | #endif
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223 |
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224 | DB_EXIT("sc_adv");
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225 | }
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226 |
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227 | /* |
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228 |
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229 | */
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230 |
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231 | /*
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232 | =============================================================================
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233 | scupd() -- update the center slice without scrolling
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234 | =============================================================================
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235 | */
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236 |
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237 | void scupd(void)
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238 | {
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239 | register int16_t masksl, maskpx, i;
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240 | register uint16_t sword;
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241 | register int32_t tl;
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242 | register uint16_t *optr, *qptr, *fsl;
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243 | int16_t soff;
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244 |
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245 | DB_ENTR("scupd");
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246 |
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247 | if (v_regs[5] & 0x0180) /* make sure we're in bank 0 */
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248 | vbank(0);
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249 |
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250 | soff = (nbmoff + soffset) & 3; /* calculate offset to use */
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251 | maskpx = nbmasks[(2 + soff) & 3]; /* setup source pixel mask */
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252 | masksl = ~maskpx; /* setup target pixel mask */
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253 | tl = 128L; /* setup VSDD line increment */
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254 |
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255 | /* update VRAM, if it's time */
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256 |
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257 | if (cslice(cursl, maskpx, masksl, gdstbc) AND (ndisp EQ 2)) {
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258 |
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259 | DB_CMNT("scupd - center write ...");
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260 |
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261 | fsl = cursl;
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262 | optr = saddr + ((soff > 1) ? 64L : 63L);
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263 | qptr = consl;
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264 |
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265 | for (i = 224; i--; ) {
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266 |
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267 | if (sword = maskpx & *fsl)
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268 | *optr = (*optr & masksl) | sword;
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269 |
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270 | *fsl++ = *qptr++; /* clean up the slice */
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271 | optr += tl;
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272 | }
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273 |
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274 | DB_CMNT("scupd - center written");
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275 | }
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276 |
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277 | ctrsw = FALSE;
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278 | }
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279 |
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