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Webgl Helper / add an API for OESElementIndexUint extension

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This commit is contained in:
Frederic Junod
2019-05-21 10:27:53 +02:00
committed by Olivier Guyot
parent 7fb113c3dc
commit 06be00bbd5
2 changed files with 17 additions and 7 deletions
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5
src/ol/renderer/webgl/PointsLayer.js
View File

@@ -2,7 +2,7 @@
* @module ol/renderer/webgl/PointsLayer
*/
import WebGLArrayBuffer from '../../webgl/Buffer.js';
import {DYNAMIC_DRAW, ARRAY_BUFFER, ELEMENT_ARRAY_BUFFER, FLOAT, EXTENSIONS as WEBGL_EXTENSIONS} from '../../webgl.js';
import {DYNAMIC_DRAW, ARRAY_BUFFER, ELEMENT_ARRAY_BUFFER, FLOAT} from '../../webgl.js';
import {DefaultAttrib, DefaultUniform} from '../../webgl/Helper.js';
import GeometryType from '../../geom/GeometryType.js';
import WebGLLayerRenderer, {
@@ -19,7 +19,6 @@ import {
apply as applyTransform
} from '../../transform.js';
import {create as createWebGLWorker} from '../../worker/webgl.js';
import {includes} from '../../array.js';
const VERTEX_SHADER = `
precision mediump float;
@@ -421,7 +420,7 @@ class WebGLPointsLayerRenderer extends WebGLLayerRenderer {
const message = {
type: WebGLWorkerMessageType.GENERATE_BUFFERS,
renderInstructions: this.renderInstructions_.buffer,
useShortIndices: !includes(WEBGL_EXTENSIONS, 'OES_element_index_uint')
useShortIndices: !this.helper.getElementIndexUintEnabled()
};
// additional properties will be sent back as-is by the worker
message['projectionTransform'] = projectionTransform;

19
src/ol/webgl/Helper.js
View File

@@ -260,11 +260,12 @@ class WebGLHelper extends Disposable {
/**
* @type {boolean}
* @private
*/
this.hasOESElementIndexUint = includes(WEBGL_EXTENSIONS, 'OES_element_index_uint');
this.hasOESElementIndexUint_ = includes(WEBGL_EXTENSIONS, 'OES_element_index_uint');
// use the OES_element_index_uint extension if available
if (this.hasOESElementIndexUint) {
if (this.hasOESElementIndexUint_) {
gl.getExtension('OES_element_index_uint');
}
@@ -452,9 +453,9 @@ class WebGLHelper extends Disposable {
*/
drawElements(start, end) {
const gl = this.getGL();
const elementType = this.hasOESElementIndexUint ?
const elementType = this.hasOESElementIndexUint_ ?
gl.UNSIGNED_INT : gl.UNSIGNED_SHORT;
const elementSize = this.hasOESElementIndexUint ? 4 : 2;
const elementSize = this.hasOESElementIndexUint_ ? 4 : 2;
const numItems = end - start;
const offsetInBytes = start * elementSize;
@@ -746,6 +747,16 @@ class WebGLHelper extends Disposable {
handleWebGLContextRestored() {
}
/**
* Returns whether the `OES_element_index_uint` WebGL extension is enabled for this context.
* @return {boolean} If true, Uint16Array should be used for element array buffers
* instead of Uint8Array.
* @api
*/
getElementIndexUintEnabled() {
return this.hasOESElementIndexUint_;
}
// TODO: shutdown program
/**