23c2999cab
Due to the fact that the points renderer does not know for sure which attributes will be used for rendering, it is now mandatory to provide both vertex/fragment shaders for rendering AND hit detection. The hit detection shaders should expect having an `a_hitColor` that they should return to allow matching the feature uid. This will be all one eventually by shader builders under the hood.
54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
/**
|
|
* A worker that does cpu-heavy tasks related to webgl rendering.
|
|
* @module ol/worker/webgl
|
|
*/
|
|
import {
|
|
WebGLWorkerMessageType,
|
|
writePointFeatureToBuffers
|
|
} from '../renderer/webgl/Layer.js';
|
|
import {assign} from '../obj.js';
|
|
|
|
/** @type {any} */
|
|
const worker = self;
|
|
|
|
worker.onmessage = event => {
|
|
const received = event.data;
|
|
if (received.type === WebGLWorkerMessageType.GENERATE_BUFFERS) {
|
|
// This is specific to point features (x, y, index)
|
|
const baseVertexAttrsCount = 3;
|
|
const baseInstructionsCount = 2;
|
|
|
|
const customAttrsCount = received.customAttributesCount;
|
|
const instructionsCount = baseInstructionsCount + customAttrsCount;
|
|
const renderInstructions = new Float32Array(received.renderInstructions);
|
|
|
|
const elementsCount = renderInstructions.length / instructionsCount;
|
|
const indicesCount = elementsCount * 6;
|
|
const verticesCount = elementsCount * 4 * (customAttrsCount + baseVertexAttrsCount);
|
|
const indexBuffer = new Uint32Array(indicesCount);
|
|
const vertexBuffer = new Float32Array(verticesCount);
|
|
|
|
let bufferPositions = null;
|
|
for (let i = 0; i < renderInstructions.length; i += instructionsCount) {
|
|
bufferPositions = writePointFeatureToBuffers(
|
|
renderInstructions,
|
|
i,
|
|
vertexBuffer,
|
|
indexBuffer,
|
|
customAttrsCount,
|
|
bufferPositions);
|
|
}
|
|
|
|
/** @type {import('../renderer/webgl/Layer').WebGLWorkerGenerateBuffersMessage} */
|
|
const message = assign({
|
|
vertexBuffer: vertexBuffer.buffer,
|
|
indexBuffer: indexBuffer.buffer,
|
|
renderInstructions: renderInstructions.buffer
|
|
}, received);
|
|
|
|
worker.postMessage(message, [vertexBuffer.buffer, indexBuffer.buffer, renderInstructions.buffer]);
|
|
}
|
|
};
|
|
|
|
export let create;
|