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node_modules/ol/webgl.js

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+/**
+ * @module ol/webgl
+ */
+import { SAFARI_BUG_237906 } from './has.js';
+import { assign } from './obj.js';
+/**
+ * Constants taken from goog.webgl
+ */
+/**
+ * Used by {@link module:ol/webgl/Helper~WebGLHelper} for buffers containing vertices data, such as
+ * position, color, texture coordinate, etc. These vertices are then referenced by an index buffer
+ * to be drawn on screen (see {@link module:ol/webgl.ELEMENT_ARRAY_BUFFER}).
+ * @const
+ * @type {number}
+ * @api
+ */
+export var ARRAY_BUFFER = 0x8892;
+/**
+ * Used by {@link module:ol/webgl/Helper~WebGLHelper} for buffers containing indices data.
+ * Index buffers are essentially lists of references to vertices defined in a vertex buffer
+ * (see {@link module:ol/webgl.ARRAY_BUFFER}), and define the primitives (triangles) to be drawn.
+ * @const
+ * @type {number}
+ * @api
+ */
+export var ELEMENT_ARRAY_BUFFER = 0x8893;
+/**
+ * Used by {link module:ol/webgl/Buffer~WebGLArrayBuffer}.
+ * @const
+ * @type {number}
+ * @api
+ */
+export var STREAM_DRAW = 0x88e0;
+/**
+ * Used by {link module:ol/webgl/Buffer~WebGLArrayBuffer}.
+ * @const
+ * @type {number}
+ * @api
+ */
+export var STATIC_DRAW = 0x88e4;
+/**
+ * Used by {link module:ol/webgl/Buffer~WebGLArrayBuffer}.
+ * @const
+ * @type {number}
+ * @api
+ */
+export var DYNAMIC_DRAW = 0x88e8;
+/**
+ * @const
+ * @type {number}
+ */
+export var UNSIGNED_BYTE = 0x1401;
+/**
+ * @const
+ * @type {number}
+ */
+export var UNSIGNED_SHORT = 0x1403;
+/**
+ * @const
+ * @type {number}
+ */
+export var UNSIGNED_INT = 0x1405;
+/**
+ * @const
+ * @type {number}
+ */
+export var FLOAT = 0x1406;
+/** end of goog.webgl constants
+ */
+/**
+ * @const
+ * @type {Array<string>}
+ */
+var CONTEXT_IDS = ['experimental-webgl', 'webgl', 'webkit-3d', 'moz-webgl'];
+/**
+ * @param {HTMLCanvasElement} canvas Canvas.
+ * @param {Object} [opt_attributes] Attributes.
+ * @return {WebGLRenderingContext} WebGL rendering context.
+ */
+export function getContext(canvas, opt_attributes) {
+    var attributes = assign({
+        preserveDrawingBuffer: true,
+        antialias: SAFARI_BUG_237906 ? false : true, // https://bugs.webkit.org/show_bug.cgi?id=237906
+    }, opt_attributes);
+    var ii = CONTEXT_IDS.length;
+    for (var i = 0; i < ii; ++i) {
+        try {
+            var context = canvas.getContext(CONTEXT_IDS[i], attributes);
+            if (context) {
+                return /** @type {!WebGLRenderingContext} */ (context);
+            }
+        }
+        catch (e) {
+            // pass
+        }
+    }
+    return null;
+}
+/**
+ * @type {Array<string>}
+ */
+var supportedExtensions;
+/**
+ * @return {Array<string>} List of supported WebGL extensions.
+ */
+export function getSupportedExtensions() {
+    if (!supportedExtensions) {
+        var canvas = document.createElement('canvas');
+        var gl = getContext(canvas);
+        if (gl) {
+            supportedExtensions = gl.getSupportedExtensions();
+        }
+    }
+    return supportedExtensions;
+}
+//# sourceMappingURL=webgl.js.map