8bitworkshop/gen/common/wasmplatform.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BaseWASMMachine = void 0;
const devices_1 = require("./devices");
const emu_1 = require("./emu");
// WASM Support
// TODO: detangle from c64
class BaseWASMMachine {
    constructor(prefix) {
        this.maxROMSize = 0x40000;
        this.videoOffsetBytes = 0;
        this.prefix = prefix;
        var self = this;
        this.cpu = {
            getPC: self.getPC.bind(self),
            getSP: self.getSP.bind(self),
            isStable: self.isStable.bind(self),
            reset: self.reset.bind(self),
            saveState: () => {
                return self.getCPUState();
            },
            loadState: () => {
                console.log("loadState not implemented");
            },
            connectMemoryBus() {
                console.log("connectMemoryBus not implemented");
            },
        };
    }
    getImports(wmod) {
        return {};
    }
    async fetchWASM() {
        var wasmResponse = await fetch('res/' + this.prefix + '.wasm');
        if (wasmResponse.status == 200 || wasmResponse.size) {
            var wasmBinary = await wasmResponse.arrayBuffer();
            var wasmCompiled = await WebAssembly.compile(wasmBinary);
            var wasmResult = await WebAssembly.instantiate(wasmCompiled, this.getImports(wasmCompiled));
            this.instance = wasmResult;
            this.exports = wasmResult.exports;
        }
        else
            throw new Error('could not load WASM file');
    }
    allocateBIOS(biosBinary) {
        this.biosptr = this.exports.malloc(biosBinary.byteLength);
        this.biosarr = new Uint8Array(this.exports.memory.buffer, this.biosptr, biosBinary.byteLength);
    }
    async fetchBIOS() {
        var biosResponse = await fetch('res/' + this.prefix + '.bios');
        if (biosResponse.status == 200 || biosResponse.size) {
            var biosBinary = new Uint8Array(await biosResponse.arrayBuffer());
            this.allocateBIOS(biosBinary);
            this.loadBIOS(biosBinary);
        }
        else
            throw new Error('could not load BIOS file');
    }
    async initWASM() {
        // init machine instance
        this.sys = this.exports.machine_init(this.biosptr);
        let statesize = this.exports.machine_get_state_size();
        this.stateptr = this.exports.malloc(statesize);
        let ctrlstatesize = this.exports.machine_get_controls_state_size();
        this.ctrlstateptr = this.exports.malloc(ctrlstatesize);
        let cpustatesize = this.exports.machine_get_cpu_state_size();
        this.cpustateptr = this.exports.malloc(cpustatesize);
        this.romptr = this.exports.malloc(this.maxROMSize);
        // create state buffers
        // must do this after allocating memory (and everytime we grow memory?)
        this.statearr = new Uint8Array(this.exports.memory.buffer, this.stateptr, statesize);
        this.ctrlstatearr = new Uint8Array(this.exports.memory.buffer, this.ctrlstateptr, ctrlstatesize);
        this.cpustatearr = new Uint8Array(this.exports.memory.buffer, this.cpustateptr, cpustatesize);
        // create audio buffer
        let sampbufsize = 4096 * 4;
        this.audioarr = new Float32Array(this.exports.memory.buffer, this.exports.machine_get_sample_buffer(), sampbufsize);
        // create ROM buffer
        this.romarr = new Uint8Array(this.exports.memory.buffer, this.romptr, this.maxROMSize);
        // enable c64 joystick map to arrow keys (TODO)
        //this.exports.c64_set_joystick_type(this.sys, 1);
        console.log('machine_init', this.sys, statesize, ctrlstatesize, cpustatesize, sampbufsize);
    }
    async loadWASM() {
        await this.fetchWASM();
        this.exports.memory.grow(96); // TODO: need more when probing?
        await this.fetchBIOS();
        await this.initWASM();
    }
    getPC() {
        return this.exports.machine_cpu_get_pc(this.sys);
    }
    getSP() {
        return this.exports.machine_cpu_get_sp(this.sys);
    }
    isStable() {
        return this.exports.machine_cpu_is_stable(this.sys);
    }
    loadROM(rom) {
        if (rom.length > this.maxROMSize)
            throw new emu_1.EmuHalt(`Rom size too big: ${rom.length} bytes`);
        this.romarr.set(rom);
        this.romlen = rom.length;
        console.log('load rom', rom.length, 'bytes');
        this.reset(); // TODO?
    }
    // TODO: can't load after machine_init
    loadBIOS(srcArray) {
        this.biosarr.set(srcArray);
    }
    reset() {
        this.exports.machine_reset(this.sys);
    }
    /* TODO: we don't need this because c64_exec does this?
    pollControls() {
      this.exports.machine_start_frame(this.sys);
    }
    */
    read(address) {
        return this.exports.machine_mem_read(this.sys, address & 0xffff);
    }
    readConst(address) {
        return this.exports.machine_mem_read(this.sys, address & 0xffff);
    }
    write(address, value) {
        this.exports.machine_mem_write(this.sys, address & 0xffff, value & 0xff);
    }
    getAudioParams() {
        return { sampleRate: 44100, stereo: false };
    }
    connectVideo(pixels) {
        this.pixel_dest = pixels;
        var pixbuf = this.exports.machine_get_pixel_buffer(this.sys); // save video pointer
        console.log('connectVideo', pixbuf, pixels.length);
        this.pixel_src = new Uint32Array(this.exports.memory.buffer, pixbuf + this.videoOffsetBytes, pixels.length);
    }
    syncVideo() {
        if (this.exports.machine_update_video) {
            this.exports.machine_update_video(this.sys);
        }
        if (this.pixel_dest != null) {
            this.pixel_dest.set(this.pixel_src);
        }
    }
    // assume controls buffer is smaller than cpu buffer
    saveControlsState() {
        //console.log(1, this.romptr, this.romlen, this.ctrlstateptr, this.romarr.slice(0,4), this.ctrlstatearr.slice(0,4));
        this.exports.machine_save_controls_state(this.sys, this.ctrlstateptr);
        //console.log(2, this.romptr, this.romlen, this.ctrlstateptr, this.romarr.slice(0,4), this.ctrlstatearr.slice(0,4));
        return { controls: this.ctrlstatearr.slice(0) };
    }
    loadControlsState(state) {
        this.ctrlstatearr.set(state.controls);
        this.exports.machine_load_controls_state(this.sys, this.ctrlstateptr);
    }
    connectAudio(audio) {
        this.audio = audio;
    }
    syncAudio() {
        if (this.audio != null) {
            var n = this.exports.machine_get_sample_count();
            for (var i = 0; i < n; i++) {
                this.audio.feedSample(this.audioarr[i], 1);
            }
        }
    }
    // TODO: tick might advance 1 instruction
    advanceFrameClock(trap, cpf) {
        var i;
        if (trap) {
            for (i = 0; i < cpf; i++) {
                if (trap()) {
                    break;
                }
                this.exports.machine_tick(this.sys);
            }
        }
        else {
            this.exports.machine_exec(this.sys, cpf);
            i = cpf;
        }
        this.syncVideo();
        this.syncAudio();
        return i;
    }
    copyProbeData() {
        if (this.probe && !(this.probe instanceof devices_1.NullProbe)) {
            var datalen = this.exports.machine_get_probe_buffer_size();
            var dataaddr = this.exports.machine_get_probe_buffer_address();
            // TODO: more efficient way to put into probe
            var databuf = new Uint32Array(this.exports.memory.buffer, dataaddr, datalen);
            this.probe.logNewFrame(); // TODO: machine should do this
            this.probe.addLogBuffer(databuf);
        }
    }
    connectProbe(probe) {
        this.probe = probe;
    }
    getDebugTree() {
        return this.saveState();
    }
}
exports.BaseWASMMachine = BaseWASMMachine;
//# sourceMappingURL=wasmplatform.js.map