[f40a309] | 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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[b28a12e] | 12 | #include "ram.h"
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[e225e77] | 13 |
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[f40a309] | 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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[7258c6a] | 20 | int16_t nbmoff = 3;
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| 21 | int16_t wrdoff = 3;
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[f40a309] | 22 |
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[7258c6a] | 23 | int16_t nbmasks[4] = { /* nybble masks */
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[f40a309] | 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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[0580615] | 43 |
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[f40a309] | 44 | void sc_adv(void)
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[7258c6a] | 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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[f40a309] | 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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[7258c6a] | 200 |
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[f40a309] | 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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[0580615] | 231 | /*
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[f40a309] | 232 | =============================================================================
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[7258c6a] | 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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[f40a309] | 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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[6262b5c] | 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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