126 lines
2.6 KiB
TypeScript
126 lines
2.6 KiB
TypeScript
export type BackendCapabilities = {
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webgl: boolean;
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wasmSimd: boolean;
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offscreenCanvas: boolean;
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};
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type CapabilityProbes = {
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probeWebgl: () => boolean;
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probeWasmSimd: () => boolean;
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probeOffscreenCanvas: () => boolean;
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};
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let cachedDefaultCapabilities: BackendCapabilities | null = null;
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export const WASM_SIMD_PROBE_MODULE = new Uint8Array([
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0x00,
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0x61,
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0x73,
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0x6d,
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0x01,
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0x00,
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0x00,
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0x00,
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0x01,
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0x05,
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0x01,
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0x60,
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0x00,
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0x01,
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0x7b,
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0x03,
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0x02,
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0x01,
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0x00,
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0x0a,
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0x0a,
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0x01,
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0x08,
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0x00,
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0x41,
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0x00,
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0xfd,
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0x0f,
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0x0b,
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]);
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function probeOffscreenCanvasAvailability(): boolean {
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return typeof OffscreenCanvas !== "undefined";
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}
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function releaseProbeWebglContext(
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context: WebGLRenderingContext | WebGL2RenderingContext | null,
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): void {
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if (!context) {
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return;
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}
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try {
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context.getExtension("WEBGL_lose_context")?.loseContext();
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} catch {
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// Ignore cleanup failures in capability probes.
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}
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}
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function probeWebglAvailability(): boolean {
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try {
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if (typeof document !== "undefined") {
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const canvas = document.createElement("canvas");
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const context = canvas.getContext("webgl2") ?? canvas.getContext("webgl");
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if (context) {
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releaseProbeWebglContext(context);
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return true;
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}
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}
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if (typeof OffscreenCanvas !== "undefined") {
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const offscreenCanvas = new OffscreenCanvas(1, 1);
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const context = offscreenCanvas.getContext("webgl2") ?? offscreenCanvas.getContext("webgl");
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releaseProbeWebglContext(context);
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return Boolean(context);
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}
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return false;
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} catch {
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return false;
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}
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}
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function probeWasmSimdAvailability(): boolean {
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if (typeof WebAssembly === "undefined" || typeof WebAssembly.validate !== "function") {
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return false;
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}
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try {
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return WebAssembly.validate(WASM_SIMD_PROBE_MODULE);
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} catch {
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return false;
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}
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}
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export function resetBackendCapabilitiesCache(): void {
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cachedDefaultCapabilities = null;
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}
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export function detectBackendCapabilities(probes?: Partial<CapabilityProbes>): BackendCapabilities {
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if (!probes && cachedDefaultCapabilities) {
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return cachedDefaultCapabilities;
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}
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const probeWebgl = probes?.probeWebgl ?? probeWebglAvailability;
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const probeWasmSimd = probes?.probeWasmSimd ?? probeWasmSimdAvailability;
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const probeOffscreenCanvas = probes?.probeOffscreenCanvas ?? probeOffscreenCanvasAvailability;
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const capabilities = {
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webgl: probeWebgl(),
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wasmSimd: probeWasmSimd(),
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offscreenCanvas: probeOffscreenCanvas(),
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};
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if (!probes) {
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cachedDefaultCapabilities = capabilities;
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}
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return capabilities;
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}
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