424 lines
12 KiB
C
424 lines
12 KiB
C
// Space Taxi -- the passenger / fare state machine ($65C1 dispatch on
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// $7163, the $67E3 post-tick gate and the pad reservation table).
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//
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// One passenger at a time: they beam in on a free pad, wave, walk to a
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// cab parked on their pad, shrink into it, ride, and reverse the whole
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// sequence at the destination. Every step runs on the shared 3-tick
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// decay timer. Pads get reserved as fares use them; once every fare
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// pad has been used the destination becomes "UP PLEASE" and the top
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// hatch opens.
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#include "stSim.h"
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// Screen-code strings ($6C1E..$6C7D). All ASCII-compatible glyphs.
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static const uint8_t kTextPadPlease[] = "PAD PLEASE"; // $6C1E
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static const uint8_t kTextUpPlease[] = " UP PLEASE! "; // $6C2B
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static const uint8_t kTextHeyTaxi[] = " HEY, TAXI! "; // $6C45
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static const uint8_t kTextThanks[] = " THANKS "; // $6C5F
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// Speech cue strings fed to the sample player one character at a time.
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static const uint8_t kSpeechHeyTaxi[] = "HT"; // $6C6C
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static const uint8_t kSpeechUp[] = "U?"; // $6C6F
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static const uint8_t kSpeechPad[] = "PX?"; // $6C72 (X = digit)
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static const uint8_t kSpeechThanks[] = "!"; // $6C76
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static const uint8_t kSpeechHey[] = "H"; // $6C78
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// Waiting wave cycle ($66D6) and the base-fare blob ($43B9 = +5.00).
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static const uint8_t kWaveCels[4] = { 0xC6, 0xC7, 0xD9, 0xC7 };
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static const uint8_t kFareBlob[7] = { 0x66, 0x66, 0x66, 0x6F, 0x77, 0x74, 0x74 };
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static void beamIn(StSimT *sim);
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static bool decayStep(StSimT *sim);
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static void idleTicker(StSimT *sim);
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static void lightOnAndLatch(StSimT *sim);
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static void newFare(StSimT *sim);
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static void stageBoard(StSimT *sim);
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static void stageCleanup(StSimT *sim);
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static void stageDropIn(StSimT *sim);
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static void walkToTarget(StSimT *sim);
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// $665F -- the passenger grows in ($CB down to $C7); a crash during
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// it cancels the fare.
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static void beamIn(StSimT *sim) {
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if (!decayStep(sim)) {
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return;
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}
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sim->spr[1].ptr--;
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if (sim->spr[1].ptr != ST_SPRITE_PASS_STAND) {
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return;
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}
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if (sim->collisionPhase != 0u) {
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sim->stage = ST_STAGE_LEAVE;
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sim->spr[1].ptr = ST_SPRITE_PASS_STAND;
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sim->spriteSlots[sim->activeSpriteIdx] = 0u;
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sim->activeSpriteIdx = 0u;
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sim->fareSlotCount--;
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return;
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}
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sim->stage++;
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stSimDrawText(sim, 14u, 24u, kTextHeyTaxi, 1u);
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stFareBoardingSound(sim, kSpeechHeyTaxi);
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// $43D1: the meter starts at $10.00..$19.00.
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stSimHudInit(sim);
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stSimPutChar(sim, 35u, 24u, (uint8_t)(ST_CHAR_DIGIT_BASE + stSimRng(sim, 10u)));
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stSimPutChar(sim, 34u, 24u, (uint8_t)(ST_CHAR_DIGIT_BASE + 1u));
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}
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// The shared 3-tick cadence: true on the tick a step is due.
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static bool decayStep(StSimT *sim) {
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sim->decayTimer--;
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if (sim->decayTimer != 0u) {
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return false;
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}
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sim->decayTimer = sim->decayReload;
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return true;
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}
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// $660B -- a new fare turns up on a 3% roll per tick or when the
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// 100-tick timer runs out, never mid-crash.
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static void idleTicker(StSimT *sim) {
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if (stSimRng(sim, 100u) >= 3u) {
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sim->stage0Rng--;
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if (sim->stage0Rng != 0u) {
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return;
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}
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}
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if (sim->collisionPhase != 0u) {
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return;
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}
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newFare(sim);
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}
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// $6808 -- the pad lights up and stays "busy".
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static void lightOnAndLatch(StSimT *sim) {
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sim->deathInProgress = 1u;
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stSimPadLight(sim, true);
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}
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// $6620 -- pick a free pad, stand the passenger there, start beaming.
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static void newFare(StSimT *sim) {
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uint8_t x;
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const StPadT *pad;
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sim->stage0Rng = 0x64u;
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x = stFareChooseDestination(sim);
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// $6628: X-1 selects the slot; a garbage X (all pads used) reads
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// past the table on the C64 -- clamp to the last pad here.
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if (x == 0u || x > ST_MAX_PADS) {
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x = ST_MAX_PADS;
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}
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pad = &sim->pads[x - 1u];
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sim->spr[1].msb = pad->passMsb;
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sim->spr[1].col = pad->passCol;
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sim->spr[1].row = pad->row;
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sim->spr[1].enable = 1u;
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sim->stage = ST_STAGE_BEAM_IN;
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sim->decayTimer = sim->decayReload;
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sim->spr[1].ptr = ST_SPRITE_PASS_BEAM;
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stAudioSpeech((uint8_t)(stSimRng(sim, 3u) + 2u));
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}
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// $66DD -- the passenger shrinks into the cab, then picks where to go.
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static void stageBoard(StSimT *sim) {
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if (!decayStep(sim)) {
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return;
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}
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sim->spr[1].ptr++;
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if (sim->spr[1].ptr != ST_SPRITE_PASS_GONE) {
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return;
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}
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sim->spr[1].enable = 0u;
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sim->stage++;
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sim->activeDyingSlot = sim->activePad;
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(void)stFareChooseDestination(sim);
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if (sim->activeSpriteIdx == ST_FARE_DEST_UP) {
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return;
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}
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stSimDrawText(sim, 14u, 24u, kTextPadPlease, 1u);
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stSimPutChar(sim, 18u, 24u, (uint8_t)(sim->activeSpriteIdx + 0x30u));
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{
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uint8_t speech[4];
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speech[0] = kSpeechPad[0];
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speech[1] = (uint8_t)(sim->activeSpriteIdx + 0x30u);
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speech[2] = kSpeechPad[2];
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speech[3] = 0u;
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stFareBoardingSound(sim, speech);
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}
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}
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// $67C6 -- back to idle.
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static void stageCleanup(StSimT *sim) {
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sim->deathInProgress = 0u;
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sim->stage = ST_STAGE_IDLE;
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stSimPadLight(sim, false);
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stSimClearMessage(sim);
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}
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// $6742 -- the passenger materialises beside the cab; the fare pays
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// out: $5.00 plus whatever is left on the meter (twice the base when
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// no pads are reserved).
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static void stageDropIn(StSimT *sim) {
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if (!decayStep(sim)) {
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return;
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}
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sim->spr[1].ptr--;
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if (sim->spr[1].ptr != ST_SPRITE_PASS_STAND) {
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return;
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}
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sim->stage++;
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stSimDrawText(sim, 14u, 24u, kTextThanks, 1u);
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stFareBoardingSound(sim, kSpeechThanks);
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stSimBcdAdd(sim, ST_CELL_SCORE, kFareBlob);
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stSimBcdAdd(sim, ST_CELL_SCORE, &sim->screen[ST_CELL_FARE]);
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stSimHudInit(sim);
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if (sim->fareSlotCount != 0u) {
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return;
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}
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stSimBcdAdd(sim, ST_CELL_SCORE, kFareBlob);
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}
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// $67A6 -- the passenger shrinks away at the stand (also intro stage 4).
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void stFareLeaveStep(StSimT *sim) {
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if (!decayStep(sim)) {
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return;
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}
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sim->spr[1].ptr++;
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if (sim->spr[1].ptr != ST_SPRITE_PASS_GONE) {
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return;
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}
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sim->spr[1].enable = 0u;
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sim->stage++;
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}
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// $66B7 -- waving on the pad (also the title's sparkle cycle).
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void stFareWaveStep(StSimT *sim) {
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if (!decayStep(sim)) {
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return;
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}
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sim->waveIdx = (uint8_t)((sim->waveIdx + 1u) & 3u);
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sim->spr[1].ptr = kWaveCels[sim->waveIdx];
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}
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// $6D0D -- one two-pixel stride toward the hover target, cel
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// alternating each step (also the title's walk-in).
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void stFareWalkStep(StSimT *sim) {
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int16_t passX;
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int16_t targetX;
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sim->walkParity ^= 1u;
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passX = (int16_t)stSimSpriteX(sim, 1u);
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targetX = (int16_t)(((int16_t)sim->hoverXFrac << 8) | sim->hoverXCol);
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if ((int16_t)(passX - targetX) < 0) {
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// $6D30: walk right, cels $C2/$C3.
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sim->spr[1].ptr = (uint8_t)(ST_SPRITE_PASS_WALK_R + sim->walkParity);
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stSimSpriteAddX(sim, 1u, 2u);
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return;
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}
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// $6D4B: walk left, cels $C4/$C5.
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sim->spr[1].ptr = (uint8_t)(ST_SPRITE_PASS_WALK_L + sim->walkParity);
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stSimSpriteAddX(sim, 1u, 0xFEu);
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}
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// $6CE8 -- stages 3 and 7: walk until the column matches (even
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// pixels), then stand and advance.
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static void walkToTarget(StSimT *sim) {
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if (!decayStep(sim)) {
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return;
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}
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if ((sim->spr[1].col & 0xFEu) == (sim->hoverXCol & 0xFEu)) {
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sim->spr[1].ptr = ST_SPRITE_PASS_STAND;
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sim->stage++;
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return;
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}
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stFareWalkStep(sim);
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}
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// ---------------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------------
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// $6C7F -- the passenger speaks: one sample per character.
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void stFareBoardingSound(StSimT *sim, const uint8_t *speech) {
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(void)sim;
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stAudioSilence();
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stAudioNoise(false);
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stAudioSpeechPhrase(speech);
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}
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// $6537 -- reserve a free fare pad by RNG (linear probe on collision),
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// or "UP PLEASE" once every fare pad is taken. Returns the pad number.
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uint8_t stFareChooseDestination(StSimT *sim) {
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uint8_t special = sim->specialPad;
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uint8_t x;
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if (sim->fareSlotCount == special) {
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stFareUpPlease(sim);
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return special;
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}
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x = stSimRng(sim, special);
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while (sim->spriteSlots[x] != 0u) {
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if (x == special) {
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x = 1u;
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} else {
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x++;
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}
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}
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sim->fareSlotCount++;
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sim->activeSpriteIdx = x;
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sim->spriteSlots[x] = 1u;
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return x;
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}
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// $6EF0 -- while the passenger walks (to or from the cab) the pad stays
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// lit only while the two sprites touch.
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void stFarePadLightingGate(StSimT *sim) {
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if (sim->stage != ST_STAGE_WALK_TO_CAB && sim->stage != ST_STAGE_WALK_TO_PAD && sim->stage != ST_STAGE_LEAVE) {
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return;
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}
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if (sim->activePad == 0u) {
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return;
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}
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sim->deathInProgress = (uint8_t)(sim->spriteSpriteColl & 2u);
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stSimPadLight(sim, sim->deathInProgress != 0u);
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}
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// $67E3 -- landed on the fare's pad: hand the passenger over.
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void stFarePostTickGate(StSimT *sim) {
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if (sim->activePad == 0u) {
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return;
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}
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if (sim->activePad != sim->activeSpriteIdx) {
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return;
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}
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switch (sim->stage) {
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case ST_STAGE_IDLE:
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case ST_STAGE_BEAM_IN:
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case ST_STAGE_WALK_TO_CAB:
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case ST_STAGE_WALK_TO_PAD:
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return;
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case ST_STAGE_WAIT:
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// $6811: remember where the cab parked.
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sim->stage++;
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sim->hoverXFrac = sim->spr[0].msb;
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sim->hoverXCol = sim->spr[0].col;
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lightOnAndLatch(sim);
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return;
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case ST_STAGE_RIDING: {
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const StPadT *pad;
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if (sim->bobTimer != 0u) {
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return;
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}
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sim->stage++;
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sim->spr[1].enable = 1u;
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sim->spr[1].msb = sim->spr[0].msb;
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sim->spr[1].col = sim->spr[0].col;
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sim->spr[1].row = sim->spr[0].row;
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sim->spr[1].ptr = ST_SPRITE_PASS_BEAM;
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sim->decayTimer = sim->decayReload;
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pad = &sim->pads[sim->activeSpriteIdx - 1u];
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sim->hoverXFrac = pad->passMsb;
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sim->hoverXCol = pad->passCol;
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lightOnAndLatch(sim);
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return;
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}
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default:
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lightOnAndLatch(sim);
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return;
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}
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}
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// $69B4 -- the cab touched the passenger: he vanishes, the fare is
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// lost and the meter is docked ten dollars.
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void stFareSquashed(StSimT *sim) {
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if (sim->stage >= ST_STAGE_LEAVE) {
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return;
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}
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if (sim->stage < ST_STAGE_DROP_IN) {
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sim->spriteSlots[sim->activeSpriteIdx] = 0u;
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sim->activeSpriteIdx = 0u;
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sim->fareSlotCount--;
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stSimClearMessage(sim);
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}
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sim->stage = ST_STAGE_LEAVE;
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stFareBoardingSound(sim, kSpeechHey);
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// $43F3: a hundred dime decrements.
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{
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uint8_t k;
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for (k = 0u; k < 100u; k++) {
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(void)stSimDecrementNumber(sim, ST_CELL_SCORE, 5u);
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}
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// $43F3 counts down in the input-mask byte and leaves it zero.
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sim->inputMask = 0u;
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}
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sim->spr[1].ptr = ST_SPRITE_PASS_STAND;
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stSimHudInit(sim);
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}
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// $65C1 -- run the current stage.
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void stFareStageDispatch(StSimT *sim) {
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switch (sim->stage) {
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case ST_STAGE_IDLE:
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idleTicker(sim);
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break;
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case ST_STAGE_BEAM_IN:
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beamIn(sim);
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break;
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case ST_STAGE_WAIT:
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stFareWaveStep(sim);
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break;
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case ST_STAGE_WALK_TO_CAB:
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case ST_STAGE_WALK_TO_PAD:
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walkToTarget(sim);
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break;
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case ST_STAGE_BOARD:
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stageBoard(sim);
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break;
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case ST_STAGE_RIDING:
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sim->deathInProgress = 0u;
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stSimPadLight(sim, false);
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break;
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case ST_STAGE_DROP_IN:
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stageDropIn(sim);
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break;
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case ST_STAGE_LEAVE:
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stFareLeaveStep(sim);
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break;
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case ST_STAGE_CLEANUP:
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stageCleanup(sim);
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break;
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default:
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sim->stage = ST_STAGE_IDLE;
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break;
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}
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}
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// $6CB8 -- no fare pad left: the passenger wants to leave the screen,
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// so the top hatch opens.
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void stFareUpPlease(StSimT *sim) {
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uint8_t k;
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sim->activeSpriteIdx = ST_FARE_DEST_UP;
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stSimDrawText(sim, 14u, 24u, kTextUpPlease, 1u);
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for (k = 0u; k < 4u; k++) {
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stSimPutChar(sim, (uint8_t)(18u + k), 0u, ST_CHAR_SPACE);
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}
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stFareBoardingSound(sim, kSpeechUp);
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}
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