90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
// Space Taxi -- STL4 level file parser (plain stdio, no JoeyLib), shared
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// by the game and the host-side simulation harness.
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//
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// Layout (all bytes, written by stuff/spacetaxi/romToLevel.py):
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// "STL4"
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// name[22] $7D78 level name in screen codes
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// header[9] $7D00 VIC colour block
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// padCount, specialPad, fuelRate
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// spawn[5] $7D5B
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// templates[8] $7D8F Y accel, X accel, Y gravity, X gravity (LE words)
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// pads[10][8] $7D0A raw slots
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// screen[1000], color[1000]
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// levelIndex
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// spriteCount, then spriteCount x (ptr, 63 bytes)
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// hookData[616] $7D98..$7FFF
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#include <stdio.h>
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#include <string.h>
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#include "stSim.h"
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static bool readBlock(FILE *fp, void *dst, size_t n);
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static bool readBlock(FILE *fp, void *dst, size_t n) {
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return fread(dst, 1, n, fp) == n;
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}
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bool stLevelParse(StLevelT *out, FILE *fp) {
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uint8_t hdr[4];
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uint8_t counts[3];
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uint8_t templates[8];
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uint8_t slots[ST_MAX_PADS][8];
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uint8_t k;
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memset(out, 0, sizeof(*out));
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if (!readBlock(fp, hdr, 4u) || hdr[0] != 'S' || hdr[1] != 'T' || hdr[2] != 'L' || hdr[3] != '4') {
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return false;
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}
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if (!readBlock(fp, out->name, ST_LEVEL_NAME_CHARS)) {
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return false;
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}
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out->name[ST_LEVEL_NAME_CHARS] = 0u;
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if (!readBlock(fp, out->header, 9u) || !readBlock(fp, counts, 3u) || !readBlock(fp, out->spawn, 5u)) {
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return false;
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}
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out->padCount = counts[0];
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out->specialPad = counts[1];
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out->fuelRate = counts[2];
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if (!readBlock(fp, templates, 8u)) {
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return false;
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}
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out->accelY = (uint16_t)(templates[0] | ((uint16_t)templates[1] << 8));
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out->accelX = (uint16_t)(templates[2] | ((uint16_t)templates[3] << 8));
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out->gravY = (uint16_t)(templates[4] | ((uint16_t)templates[5] << 8));
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out->gravX = (uint16_t)(templates[6] | ((uint16_t)templates[7] << 8));
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if (!readBlock(fp, slots, sizeof(slots))) {
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return false;
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}
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for (k = 0u; k < ST_MAX_PADS; k++) {
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out->pads[k].x1Hi = slots[k][0];
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out->pads[k].x1Lo = slots[k][1];
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out->pads[k].x2Hi = slots[k][2];
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out->pads[k].x2Lo = slots[k][3];
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out->pads[k].row = slots[k][4];
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out->pads[k].passMsb = slots[k][5];
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out->pads[k].passCol = slots[k][6];
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out->pads[k].unused = slots[k][7];
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}
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if (!readBlock(fp, out->screen, ST_SCREEN_CELLS) || !readBlock(fp, out->color, ST_SCREEN_CELLS)) {
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return false;
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}
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if (!readBlock(fp, &out->levelIndex, 1u) || !readBlock(fp, &out->spriteCount, 1u)) {
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return false;
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}
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if (out->spriteCount > ST_MAX_LEVEL_SPRITES) {
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return false;
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}
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for (k = 0u; k < out->spriteCount; k++) {
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if (!readBlock(fp, &out->sprites[k].ptr, 1u) || !readBlock(fp, out->sprites[k].bitmap, ST_SPRITE_BYTES)) {
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return false;
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}
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}
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if (!readBlock(fp, out->hookData, ST_HOOK_BYTES)) {
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return false;
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}
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return true;
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}
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