Initial project import

node_modules/three-stdlib/misc/WebGL.js

@@ -0,0 +1,75 @@
+let webGLAvailable, webGL2Available;
+function isWebGLAvailable() {
+  var _a;
+  if (webGLAvailable !== void 0)
+    return webGLAvailable;
+  try {
+    let gl;
+    const canvas = document.createElement("canvas");
+    webGLAvailable = !!(window.WebGLRenderingContext && (gl = canvas.getContext("webgl")));
+    if (gl)
+      (_a = gl.getExtension("WEBGL_lose_context")) == null ? void 0 : _a.loseContext();
+    return webGLAvailable;
+  } catch (e) {
+    return webGLAvailable = false;
+  }
+}
+function isWebGL2Available() {
+  var _a;
+  if (webGL2Available !== void 0)
+    return webGL2Available;
+  try {
+    let gl;
+    const canvas = document.createElement("canvas");
+    webGL2Available = !!(window.WebGL2RenderingContext && (gl = canvas.getContext("webgl2")));
+    if (gl)
+      (_a = gl.getExtension("WEBGL_lose_context")) == null ? void 0 : _a.loseContext();
+    return webGL2Available;
+  } catch (e) {
+    return webGL2Available = false;
+  }
+}
+function getWebGLErrorMessage() {
+  return getErrorMessage(1);
+}
+function getWebGL2ErrorMessage() {
+  return getErrorMessage(2);
+}
+function getErrorMessage(version) {
+  const names = {
+    1: "WebGL",
+    2: "WebGL 2"
+  };
+  const contexts = {
+    1: window.WebGLRenderingContext,
+    2: window.WebGL2RenderingContext
+  };
+  const element = document.createElement("div");
+  element.id = "webglmessage";
+  element.style.fontFamily = "monospace";
+  element.style.fontSize = "13px";
+  element.style.fontWeight = "normal";
+  element.style.textAlign = "center";
+  element.style.background = "#fff";
+  element.style.color = "#000";
+  element.style.padding = "1.5em";
+  element.style.width = "400px";
+  element.style.margin = "5em auto 0";
+  let message = 'Your $0 does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">$1</a>';
+  if (contexts[version]) {
+    message = message.replace("$0", "graphics card");
+  } else {
+    message = message.replace("$0", "browser");
+  }
+  message = message.replace("$1", names[version]);
+  element.innerHTML = message;
+  return element;
+}
+export {
+  getErrorMessage,
+  getWebGL2ErrorMessage,
+  getWebGLErrorMessage,
+  isWebGL2Available,
+  isWebGLAvailable
+};
+//# sourceMappingURL=WebGL.js.map