[f40a309] | 1 | /*
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| 2 | =============================================================================
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| 3 | ucslice.c -- update score display center slice
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| 4 | Version 7 -- 1988-09-28 -- 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
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| 9 |
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[6262b5c] | 10 | #include "all.h"
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[f40a309] | 11 |
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| 12 | /* variables defined elsewhere */
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| 13 |
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[7258c6a] | 14 | extern uint16_t *saddr; /* score object base address */
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[f40a309] | 15 |
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[7258c6a] | 16 | extern int16_t ndisp; /* current display number */
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| 17 | extern int16_t sd; /* scroll direction flag */
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| 18 | extern int16_t soffset; /* score object scroll offset */
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[f40a309] | 19 |
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[7258c6a] | 20 | extern int16_t gtctab[]; /* group to color table */
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| 21 | extern int16_t lintab1[]; /* note top line table - N_SHARP */
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| 22 | extern int16_t lintab2[]; /* note top line table - N_FLAT */
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| 23 | extern int16_t nbmasks[]; /* pixel mask table for slices */
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| 24 | extern int16_t nttab1[]; /* gdsel code transition table - fwd */
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| 25 | extern int16_t nttab2[]; /* gdsel code transition table - bak */
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[f40a309] | 26 |
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[c3aee8a] | 27 | extern uint16_t pxtbl[][4]; /* pixel mask table - notes */
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| 28 | extern uint16_t epxtbl[][16]; /* pixel mask table - events */
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[f40a309] | 29 |
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| 30 | extern struct gdsel *gdfsep; /* gdsel freechain pointer */
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| 31 |
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| 32 | extern struct gdsel *gdstbc[]; /* group status list heads */
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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 |
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| 38 | /*
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| 39 | =============================================================================
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| 40 | ucslice()
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| 41 |
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| 42 | Updates the center slice.
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| 43 |
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| 44 | Note transitions are based on the value of global variable 'sd',
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| 45 | which is zero for forward, and non-zero for backward scrolling.
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| 46 |
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| 47 | Note colors come from 'gtctab[]'.
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| 48 |
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| 49 | This code must be very fast or the display bogs down the system.
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| 50 | =============================================================================
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| 51 | */
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[0580615] | 52 |
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[f40a309] | 53 | void ucslice(void)
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[7258c6a] | 54 | {
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[f40a309] | 55 | register uint16_t *pxptr, *slptr;
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[7258c6a] | 56 | register struct gdsel *gdsep;
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| 57 | register int32_t lc;
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| 58 | register uint16_t i, ncolor, mask1, mask2;
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[f40a309] | 59 | uint16_t *ncptr, *nctabp;
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[7258c6a] | 60 | struct gdsel **gdstp, *gdprv, *gdnxt;
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[f40a309] | 61 | int16_t *lintab;
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| 62 |
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| 63 | DB_ENTR("ucslice()");
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| 64 |
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| 65 | lc = 128L;
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| 66 | mask1 = nbmasks[soffset];
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| 67 | mask2 = ~mask1;
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| 68 |
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| 69 | /* initialize note color, note control, and group control pointers */
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| 70 |
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| 71 | gdstp = gdstbc; /* group control table */
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| 72 | nctabp = sd ? nttab2 : nttab1; /* note transition table */
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| 73 | ncptr = gtctab; /* group to color table */
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| 74 |
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| 75 | lintab = (ac_code EQ N_SHARP) ? lintab1 : lintab2; /* line table */
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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 |
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| 81 | for (i = 0; i < 12; i++) { /* scan the group control table ... */
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| 82 |
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| 83 | ncolor = mask1 & *ncptr++; /* get note color mask */
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| 84 | gdprv = (struct gdsel *)gdstp; /* setup previous pointer */
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| 85 | gdsep = *gdstp++; /* setup current pointer */
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| 86 |
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| 87 | if (gdsep) { /* ... process each active group ... */
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| 88 |
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| 89 | do { /* ... for each note played by the group ... */
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| 90 |
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| 91 | if (ndisp EQ 2) { /* ... if display is up */
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| 92 |
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| 93 | /* setup slice and pixel pointers */
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[7258c6a] | 94 |
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[f40a309] | 95 | slptr = saddr + 64L +
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| 96 | ((int32_t)lintab[gdsep->note] << 7);
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| 97 |
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| 98 | pxptr = &pxtbl[gdsep->code][0];
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| 99 |
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| 100 | /* update the slice */
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| 101 |
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| 102 | *slptr = (*slptr & mask2) | (*pxptr++ & ncolor);
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| 103 | slptr += lc;
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| 104 |
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| 105 | *slptr = (*slptr & mask2) | (*pxptr++ & ncolor);
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| 106 | slptr += lc;
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| 107 |
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| 108 | *slptr = (*slptr & mask2) | (*pxptr++ & ncolor);
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| 109 |
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| 110 | }
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| 111 |
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| 112 | gdnxt = gdsep->next; /* set 'next element' pointer */
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| 113 |
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| 114 | /* update and check element code */
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| 115 |
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| 116 | if (0 EQ (gdsep->code = nctabp[gdsep->code])) {
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| 117 |
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| 118 | /* if it's zero, delete the element */
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| 119 |
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| 120 | gdprv->next = gdnxt;
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| 121 | gdsep->next = gdfsep;
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| 122 | gdfsep = gdsep;
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| 123 |
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| 124 | } else
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| 125 | gdprv = gdsep;
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| 126 |
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| 127 | gdsep = gdnxt; /* set pointer for next pass */
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| 128 |
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| 129 | } while (gdsep);
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| 130 | }
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| 131 | }
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| 132 |
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| 133 | /* |
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| 134 |
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| 135 | */
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| 136 | for (; i < NGDSEL; i++) {
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| 137 |
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| 138 | gdprv = (struct gdsel *)gdstp; /* setup previous pointer */
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| 139 | gdsep = *gdstp++; /* setup current pointer */
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| 140 |
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| 141 | if (gdsep) { /* ... process each active event priority ... */
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| 142 |
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| 143 | do { /* ... for each event of this priority ... */
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| 144 |
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| 145 | if (ndisp EQ 2) { /* ... if display is up */
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| 146 |
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| 147 | /* setup slice and pixel pointers */
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| 148 |
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| 149 | slptr = saddr + 27200L;
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| 150 | pxptr = &epxtbl[gdsep->code][0];
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| 151 |
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| 152 | /* get event color */
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| 153 |
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| 154 | ncolor = mask1 & gdsep->note;
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| 155 |
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| 156 | /* update the slice */
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| 157 |
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| 158 | if (*pxptr++) /* 212 */
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| 159 | *slptr = (*slptr & mask2) | ncolor;
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| 160 |
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| 161 | slptr += lc;
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| 162 |
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| 163 | if (*pxptr++) /* 213 */
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| 164 | *slptr = (*slptr & mask2) | ncolor;
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| 165 |
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| 166 | slptr += lc;
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| 167 |
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| 168 | if (*pxptr++) /* 214 */
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| 169 | *slptr = (*slptr & mask2) | ncolor;
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| 170 |
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| 171 | slptr += lc;
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| 172 |
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| 173 | if (*pxptr++) /* 215 */
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| 174 | *slptr = (*slptr & mask2) | ncolor;
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| 175 |
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| 176 | slptr += lc;
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| 177 |
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| 178 | if (*pxptr++) /* 216 */
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| 179 | *slptr = (*slptr & mask2) | ncolor;
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| 180 |
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| 181 | slptr += lc;
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| 182 |
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| 183 | if (*pxptr++) /* 217 */
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| 184 | *slptr = (*slptr & mask2) | ncolor;
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| 185 |
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| 186 | slptr += lc;
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| 187 | /* |
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| 188 |
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| 189 | */
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| 190 | if (*pxptr++) /* 218 */
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| 191 | *slptr = (*slptr & mask2) | ncolor;
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| 192 |
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| 193 | slptr += lc;
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| 194 |
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| 195 | if (*pxptr++) /* 219 */
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| 196 | *slptr = (*slptr & mask2) | ncolor;
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| 197 |
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| 198 | slptr += lc;
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| 199 |
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| 200 | if (*pxptr++) /* 220 */
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| 201 | *slptr = (*slptr & mask2) | ncolor;
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| 202 |
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| 203 | slptr += lc;
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| 204 |
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| 205 | if (*pxptr++) /* 221 */
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| 206 | *slptr = (*slptr & mask2) | ncolor;
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| 207 |
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| 208 | slptr += lc;
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| 209 |
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| 210 | if (*pxptr++) /* 222 */
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| 211 | *slptr = (*slptr & mask2) | ncolor;
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| 212 |
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| 213 | slptr += lc;
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| 214 |
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| 215 | if (*pxptr) /* 223 */
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| 216 | *slptr = (*slptr & mask2) | ncolor;
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| 217 | }
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| 218 |
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| 219 | gdnxt = gdsep->next; /* set next pointer */
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| 220 | gdprv->next = gdnxt; /* delete the element */
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| 221 | gdsep->next = gdfsep;
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| 222 | gdfsep = gdsep;
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| 223 | gdsep = gdnxt; /* set pointer for next pass */
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| 224 |
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| 225 | } while (gdsep);
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| 226 | }
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[6262b5c] | 227 | }
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| 228 |
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| 229 | DB_EXIT("ucslice");
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| 230 | }
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| 231 |
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