80 lines
2.6 KiB
JavaScript
80 lines
2.6 KiB
JavaScript
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import { WASM_MEMORY_PAGE_SIZE, appGlobals } from './globals.js'
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import { loadWasmModule, wasmPntrToJsString, wasmPntrAndLengthToJsString } from './wasm_functions.js'
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import { jsStdFunctions } from './std_functions.js'
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import { jsGlFunctions } from './gl_functions.js'
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function AcquireCanvas(canvasWidth, canvasHeight)
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{
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var canvas = document.getElementsByTagName("canvas")[0];
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// console.log(canvas);
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// set the display size of the canvas.
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canvas.style.width = canvasWidth + "px";
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canvas.style.height = canvasHeight + "px";
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// set the size of the drawingBuffer
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var devicePixelRatio = window.devicePixelRatio || 1;
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canvas.width = canvasWidth * devicePixelRatio;
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canvas.height = canvasHeight * devicePixelRatio;
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// canvasContainer = document.getElementById("canvas_container");
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// console.assert(canvasContainer != null, "Couldn't find canvas container DOM element!");
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appGlobals.canvas = canvas;
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return canvas;
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}
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function CreateGlContext(canvas)
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{
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var canvasContextGl = canvas.getContext("webgl2");
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if (canvasContextGl === null) { console.error("Unable to initialize WebGL render context. Your browser or machine may not support it :("); return null; }
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// console.dir(canvasContextGl);
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appGlobals.glContext = canvasContextGl;
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return canvasContextGl;
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}
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async function LoadWasmModule(wasmFilePath, initialWasmPageCount)
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{
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appGlobals.textDecoder = new TextDecoder("utf-8");
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let wasmEnvironment =
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{
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...jsStdFunctions,
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...jsGlFunctions,
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};
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appGlobals.wasmModule = await loadWasmModule(wasmFilePath, wasmEnvironment);
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appGlobals.memDataView = new DataView(new Uint8Array(appGlobals.wasmModule.exports.memory.buffer).buffer);
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// let heapBaseAddress = appGlobals.wasmModule.exports.__heap_base.value;
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// console.log("__heap_base = " + heapBaseAddress);
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let memorySize = appGlobals.wasmModule.exports.memory.buffer.byteLength;
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let numMemoryPagesAfterLoad = memorySize / WASM_MEMORY_PAGE_SIZE;
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if ((memorySize % WASM_MEMORY_PAGE_SIZE) != 0)
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{
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console.warn("memorySize (" + memorySize + ") is not a multiple of WASM_MEMORY_PAGE_SIZE (" + WASM_MEMORY_PAGE_SIZE + ")");
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numMemoryPagesAfterLoad++;
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}
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appGlobals.wasmModule.exports.init_mem(numMemoryPagesAfterLoad);
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}
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async function MainLoop()
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{
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console.log("Initializing WebGL Canvas...");
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var canvas = AcquireCanvas(600, 400);
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var glContext = CreateGlContext(canvas);
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console.log("Loading WASM Module...");
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await LoadWasmModule("app.wasm", 4);
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appGlobals.wasmModule.exports.App_Initialize();
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console.log("Running!");
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function renderFrame()
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{
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appGlobals.wasmModule.exports.App_UpdateAndRender();
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window.requestAnimationFrame(renderFrame);
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}
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window.requestAnimationFrame(renderFrame);
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}
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MainLoop(); |