366 lines
11 KiB
JavaScript
366 lines
11 KiB
JavaScript
import WebGLHelper, {DefaultUniform} from '../../../../src/ol/webgl/Helper.js';
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import {
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create as createTransform,
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rotate as rotateTransform,
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scale as scaleTransform,
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translate as translateTransform
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} from '../../../../src/ol/transform.js';
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import {FLOAT} from '../../../../src/ol/webgl.js';
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const VERTEX_SHADER = `
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precision mediump float;
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uniform mat4 u_offsetScaleMatrix;
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uniform mat4 u_offsetRotateMatrix;
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uniform float u_time;
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uniform float u_zoom;
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uniform float u_resolution;
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attribute float a_test;
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uniform float u_test;
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void main(void) {
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gl_Position = vec4(u_test, a_test, 0.0, 1.0);
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}`;
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const INVALID_VERTEX_SHADER = `
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precision mediump float;
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uniform mat4 u_offsetScaleMatrix;
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uniform mat4 u_offsetRotateMatrix;
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uniform float u_time;
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uniform float u_zoom;
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uniform float u_resolution;
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bla
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uniform float u_test;
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void main(void) {
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gl_Position = vec4(u_test, a_test, 0.0, 1.0);
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}`;
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const FRAGMENT_SHADER = `
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precision mediump float;
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void main(void) {
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gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
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}`;
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describe('ol.webgl.WebGLHelper', function() {
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describe('constructor', function() {
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describe('without an argument', function() {
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let h;
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beforeEach(function() {
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h = new WebGLHelper();
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});
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it('initialized WebGL context & canvas', function() {
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expect(h.getGL() instanceof WebGLRenderingContext).to.eql(true);
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expect(h.getCanvas() instanceof HTMLCanvasElement).to.eql(true);
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});
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it('has a default rendering pass', function() {
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expect(h.postProcessPasses_.length).to.eql(1);
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});
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});
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describe('with post process passes', function() {
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let h;
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beforeEach(function() {
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h = new WebGLHelper({
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postProcesses: [{
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scaleRatio: 0.5
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}, {
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uniforms: {
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u_test: 4
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}
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}]
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});
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});
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it('has instantiated post-processing passes', function() {
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expect(h.postProcessPasses_.length).to.eql(2);
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expect(h.postProcessPasses_[0].scaleRatio_).to.eql(0.5);
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expect(h.postProcessPasses_[0].uniforms_.length).to.eql(0);
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expect(h.postProcessPasses_[1].scaleRatio_).to.eql(1);
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expect(h.postProcessPasses_[1].uniforms_.length).to.eql(1);
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expect(h.postProcessPasses_[1].uniforms_[0].value).to.eql(4);
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});
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});
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});
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describe('operations', function() {
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describe('prepare draw', function() {
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let h;
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beforeEach(function() {
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h = new WebGLHelper({
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uniforms: {
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u_test1: 42,
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u_test2: [1, 3],
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u_test3: document.createElement('canvas'),
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u_test4: createTransform()
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}
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});
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h.useProgram(h.getProgram(FRAGMENT_SHADER, VERTEX_SHADER));
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h.prepareDraw({
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pixelRatio: 2,
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size: [50, 80],
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viewState: {
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rotation: 10,
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resolution: 10,
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center: [0, 0]
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}
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});
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});
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it('has resized the canvas', function() {
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expect(h.getCanvas().width).to.eql(100);
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expect(h.getCanvas().height).to.eql(160);
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});
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it('has processed default uniforms', function() {
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expect(h.uniformLocations_[DefaultUniform.OFFSET_ROTATION_MATRIX]).not.to.eql(undefined);
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expect(h.uniformLocations_[DefaultUniform.OFFSET_SCALE_MATRIX]).not.to.eql(undefined);
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expect(h.uniformLocations_[DefaultUniform.TIME]).not.to.eql(undefined);
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});
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it('has processed uniforms', function() {
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expect(h.uniforms_.length).to.eql(4);
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expect(h.uniforms_[0].name).to.eql('u_test1');
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expect(h.uniforms_[1].name).to.eql('u_test2');
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expect(h.uniforms_[2].name).to.eql('u_test3');
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expect(h.uniforms_[3].name).to.eql('u_test4');
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expect(h.uniforms_[0].location).to.not.eql(-1);
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expect(h.uniforms_[1].location).to.not.eql(-1);
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expect(h.uniforms_[2].location).to.not.eql(-1);
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expect(h.uniforms_[3].location).to.not.eql(-1);
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expect(h.uniforms_[2].texture).to.not.eql(undefined);
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});
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});
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describe('valid shader compiling', function() {
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let h;
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let p;
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beforeEach(function() {
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h = new WebGLHelper();
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p = h.getProgram(FRAGMENT_SHADER, VERTEX_SHADER);
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h.useProgram(p);
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});
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it('has saved the program', function() {
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expect(h.currentProgram_).to.eql(p);
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});
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it('has no shader compilation error', function() {
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expect(h.shaderCompileErrors_).to.eql(null);
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});
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it('can find the uniform location', function() {
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expect(h.getUniformLocation('u_test')).to.not.eql(null);
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});
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it('can find the attribute location', function() {
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expect(h.getAttributeLocation('a_test')).to.not.eql(-1);
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});
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it('cannot find an unknown attribute location', function() {
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expect(h.getAttributeLocation('a_test_missing')).to.eql(-1);
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});
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});
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describe('invalid shader compiling', function() {
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let h;
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let p;
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beforeEach(function() {
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h = new WebGLHelper();
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p = h.getProgram(FRAGMENT_SHADER, INVALID_VERTEX_SHADER);
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h.useProgram(p);
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});
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it('has saved the program', function() {
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expect(h.currentProgram_).to.eql(p);
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});
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it('has shader compilation errors', function() {
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expect(h.shaderCompileErrors_).to.not.eql(null);
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});
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it('cannot find the uniform location', function() {
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expect(h.getUniformLocation('u_test')).to.eql(null);
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});
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});
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describe('#makeProjectionTransform', function() {
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let h;
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let frameState;
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beforeEach(function() {
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h = new WebGLHelper();
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frameState = {
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size: [100, 150],
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viewState: {
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rotation: 0.4,
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resolution: 2,
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center: [10, 20]
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}
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};
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});
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it('gives out the correct transform', function() {
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const scaleX = 2 / frameState.size[0] / frameState.viewState.resolution;
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const scaleY = 2 / frameState.size[1] / frameState.viewState.resolution;
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const given = createTransform();
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const expected = createTransform();
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scaleTransform(expected, scaleX, scaleY);
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rotateTransform(expected, -frameState.viewState.rotation);
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translateTransform(expected, -frameState.viewState.center[0], -frameState.viewState.center[1]);
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h.makeProjectionTransform(frameState, given);
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expect(given.map(val => val.toFixed(15))).to.eql(expected.map(val => val.toFixed(15)));
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});
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});
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describe('#createTexture', function() {
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let h;
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beforeEach(function() {
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h = new WebGLHelper();
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});
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it('creates an empty texture from scratch', function() {
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const width = 4;
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const height = 4;
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const t = h.createTexture([width, height]);
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const gl = h.getGL();
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const fb = gl.createFramebuffer();
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gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
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gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, t, 0);
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const data = new Uint8Array(width * height * 4);
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gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, data);
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gl.deleteFramebuffer(fb);
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expect(data[0]).to.eql(0);
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expect(data[1]).to.eql(0);
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expect(data[2]).to.eql(0);
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expect(data[3]).to.eql(0);
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expect(data[4]).to.eql(0);
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expect(data[5]).to.eql(0);
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expect(data[6]).to.eql(0);
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expect(data[7]).to.eql(0);
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});
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it('creates a texture from image data', function() {
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const width = 4;
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const height = 4;
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const canvas = document.createElement('canvas');
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const image = canvas.getContext('2d').createImageData(width, height);
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for (let i = 0; i < image.data.length; i += 4) {
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image.data[i] = 100;
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image.data[i + 1] = 150;
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image.data[i + 2] = 200;
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image.data[i + 3] = 250;
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}
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const t = h.createTexture([width, height], image);
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const gl = h.getGL();
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const fb = gl.createFramebuffer();
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gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
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gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, t, 0);
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const data = new Uint8Array(width * height * 4);
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gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, data);
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gl.deleteFramebuffer(fb);
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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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});
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it('reuses a given texture', function() {
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const width = 4;
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const height = 4;
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const gl = h.getGL();
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const t1 = gl.createTexture();
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const t2 = h.createTexture([width, height], undefined, t1);
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expect(t1).to.be(t2);
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});
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});
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});
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describe('#enableAttributes', function() {
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let baseAttrs, h;
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beforeEach(function() {
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h = new WebGLHelper();
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baseAttrs = [
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{
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name: 'attr1',
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size: 3
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},
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{
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name: 'attr2',
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size: 2
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},
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{
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name: 'attr3',
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size: 1
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}
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];
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h.useProgram(h.getProgram(FRAGMENT_SHADER, `
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precision mediump float;
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uniform mat4 u_projectionMatrix;
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uniform mat4 u_offsetScaleMatrix;
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uniform mat4 u_offsetRotateMatrix;
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attribute vec3 attr1;
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attribute vec2 attr2;
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attribute float attr3;
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uniform float u_test;
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void main(void) {
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gl_Position = vec4(u_test, a_test, 0.0, 1.0);
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}`));
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});
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it('enables attributes based on the given array (FLOAT)', function() {
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const spy = sinon.spy(h, 'enableAttributeArray_');
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h.enableAttributes(baseAttrs);
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const bytesPerFloat = Float32Array.BYTES_PER_ELEMENT;
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expect(spy.callCount).to.eql(3);
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expect(spy.getCall(0).args[0]).to.eql('attr1');
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expect(spy.getCall(0).args[1]).to.eql(3);
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expect(spy.getCall(0).args[2]).to.eql(FLOAT);
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expect(spy.getCall(0).args[3]).to.eql(6 * bytesPerFloat);
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expect(spy.getCall(0).args[4]).to.eql(0);
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expect(spy.getCall(1).args[0]).to.eql('attr2');
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expect(spy.getCall(1).args[1]).to.eql(2);
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expect(spy.getCall(1).args[2]).to.eql(FLOAT);
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expect(spy.getCall(1).args[3]).to.eql(6 * bytesPerFloat);
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expect(spy.getCall(1).args[4]).to.eql(3 * bytesPerFloat);
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expect(spy.getCall(2).args[0]).to.eql('attr3');
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expect(spy.getCall(2).args[1]).to.eql(1);
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expect(spy.getCall(2).args[2]).to.eql(FLOAT);
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expect(spy.getCall(2).args[3]).to.eql(6 * bytesPerFloat);
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expect(spy.getCall(2).args[4]).to.eql(5 * bytesPerFloat);
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});
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});
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});
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