2412fe0211
From now on we will assume this extension is always enabled. An error message have been added in the unlikely scenario of a lack of support.
49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
/**
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* A worker that does cpu-heavy tasks related to webgl rendering.
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* @module ol/worker/webgl
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*/
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import {
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POINT_INSTRUCTIONS_COUNT,
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POINT_VERTEX_STRIDE,
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WebGLWorkerMessageType,
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writePointFeatureToBuffers
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} from '../renderer/webgl/Layer.js';
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import {assign} from '../obj.js';
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onmessage = event => {
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const received = event.data;
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if (received.type === WebGLWorkerMessageType.GENERATE_BUFFERS) {
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const renderInstructions = new Float32Array(received.renderInstructions);
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const customAttributesCount = received.customAttributesCount || 0;
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const instructionsCount = POINT_INSTRUCTIONS_COUNT + customAttributesCount;
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const elementsCount = renderInstructions.length / instructionsCount;
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const indicesCount = elementsCount * 6;
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const verticesCount = elementsCount * 4 * (POINT_VERTEX_STRIDE + customAttributesCount);
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const indexBuffer = new Uint32Array(indicesCount);
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const vertexBuffer = new Float32Array(verticesCount);
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let bufferPositions = null;
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for (let i = 0; i < renderInstructions.length; i += instructionsCount) {
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bufferPositions = writePointFeatureToBuffers(
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renderInstructions,
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i,
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vertexBuffer,
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indexBuffer,
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bufferPositions,
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instructionsCount);
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}
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/** @type {import('../renderer/webgl/Layer').WebGLWorkerGenerateBuffersMessage} */
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const message = assign({
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vertexBuffer: vertexBuffer.buffer,
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indexBuffer: indexBuffer.buffer,
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renderInstructions: renderInstructions.buffer
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}, received);
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postMessage(message, [vertexBuffer.buffer, indexBuffer.buffer, renderInstructions.buffer]);
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}
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};
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export let create;
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