6224d749c4
This utility class simplifies rendering to a texture & reading the results of the render. It also allows clearing its content before a new render.
81 lines
2.3 KiB
JavaScript
81 lines
2.3 KiB
JavaScript
import WebGLRenderTarget from '../../../../src/ol/webgl/RenderTarget.js';
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import WebGLHelper from '../../../../src/ol/webgl/Helper.js';
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describe('ol.webgl.RenderTarget', function() {
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let helper, testImage_4x4;
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beforeEach(function() {
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helper = new WebGLHelper();
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const canvas = document.createElement('canvas');
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testImage_4x4 = canvas.getContext('2d').createImageData(4, 4);
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for (let i = 0; i < testImage_4x4.data.length; i += 4) {
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testImage_4x4.data[i] = 100;
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testImage_4x4.data[i + 1] = 150;
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testImage_4x4.data[i + 2] = 200;
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testImage_4x4.data[i + 3] = 250;
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}
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});
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describe('constructor', function() {
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it('creates a target of size 1x1', function() {
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const rt = new WebGLRenderTarget(helper);
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expect(rt.getSize()).to.eql([1, 1]);
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});
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it('creates a target of specified size', function() {
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const rt = new WebGLRenderTarget(helper, [12, 34]);
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expect(rt.getSize()).to.eql([12, 34]);
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});
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});
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describe('#setSize', function() {
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it('updates the target size', function() {
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const rt = new WebGLRenderTarget(helper, [12, 34]);
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expect(rt.getSize()).to.eql([12, 34]);
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rt.setSize([45, 67]);
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expect(rt.getSize()).to.eql([45, 67]);
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});
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it('does nothing if the size has not changed', function() {
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const rt = new WebGLRenderTarget(helper, [12, 34]);
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const spy = sinon.spy(rt, 'updateSize_');
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rt.setSize([12, 34]);
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expect(spy.called).to.be(false);
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rt.setSize([12, 345]);
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expect(spy.called).to.be(true);
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});
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});
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describe('#readData', function() {
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it('returns 1-pixel data with the default options', function() {
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const rt = new WebGLRenderTarget(helper);
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expect(rt.read().length).to.eql(4);
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});
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it('returns the content of the texture', function() {
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const rt = new WebGLRenderTarget(helper, [4, 4]);
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helper.createTexture([4, 4], testImage_4x4, rt.getTexture());
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const data = rt.read();
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expect(data[0]).to.eql(100);
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expect(data[1]).to.eql(150);
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expect(data[2]).to.eql(200);
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expect(data[3]).to.eql(250);
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expect(data[4]).to.eql(100);
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expect(data[5]).to.eql(150);
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expect(data[6]).to.eql(200);
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expect(data[7]).to.eql(250);
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expect(data.length).to.eql(4 * 4 * 4);
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});
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});
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});
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