From 40d5f4efe7a9784f2abe953d98c2550ad397b3f8 Mon Sep 17 00:00:00 2001
From: Olivier Guyot <olivier.guyot@camptocamp.com>
Date: Fri, 16 Nov 2018 13:33:31 +0100
Subject: [PATCH] Added unit tests for the WebGLHelper class

---
 test/spec/ol/webgl/helper.test.js | 185 ++++++++++++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100644 test/spec/ol/webgl/helper.test.js

diff --git a/test/spec/ol/webgl/helper.test.js b/test/spec/ol/webgl/helper.test.js
new file mode 100644
index 0000000000..c35f2e8dd9
--- /dev/null
+++ b/test/spec/ol/webgl/helper.test.js
@@ -0,0 +1,185 @@
+import WebGLHelper from '../../../../src/ol/webgl/Helper';
+import WebGLVertex from '../../../../src/ol/webgl/Vertex';
+import WebGLFragment from '../../../../src/ol/webgl/Fragment';
+
+
+const VERTEX_SHADER = `
+  precision mediump float;
+  
+  uniform mat4 u_projectionMatrix;
+  uniform mat4 u_offsetScaleMatrix;
+  uniform mat4 u_offsetRotateMatrix;
+  
+  attribute float a_test;
+  uniform float u_test;
+  
+  void main(void) {
+    gl_Position = vec4(u_test, a_test, 0.0, 1.0);
+  }`;
+
+const INVALID_VERTEX_SHADER = `
+  precision mediump float;
+  
+  attribute float a_test;
+  uniform float u_test;
+  
+  void main(void) {
+    gl_Position = vec4(1, 1, 1, 0);
+  }`;
+
+const FRAGMENT_SHADER = `
+  precision mediump float;
+  
+  void main(void) {
+    gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
+  }`;
+
+describe('ol.webgl.WebGLHelper', function() {
+
+  describe('constructor', function() {
+
+    describe('without an argument', function() {
+
+      let h;
+      beforeEach(function() {
+        h = new WebGLHelper();
+      });
+
+      it('initialized WebGL context & canvas', function() {
+        expect(h.getGL() instanceof WebGLRenderingContext).to.eql(true);
+        expect(h.getCanvas() instanceof HTMLCanvasElement).to.eql(true);
+      });
+
+      it('has a default rendering pass', function() {
+        expect(h.postProcessPasses_.length).to.eql(1);
+      });
+    });
+
+    describe('with post process passes', function() {
+
+      let h;
+      beforeEach(function() {
+        h = new WebGLHelper({
+          postProcesses: [{
+            scaleRatio: 0.5
+          }, {
+            uniforms: {
+              u_test: 4
+            }
+          }]
+        });
+      });
+
+      it('has instantiated post-processing passes', function() {
+        expect(h.postProcessPasses_.length).to.eql(2);
+        expect(h.postProcessPasses_[0].scaleRatio_).to.eql(0.5);
+        expect(h.postProcessPasses_[0].uniforms_.length).to.eql(0);
+        expect(h.postProcessPasses_[1].scaleRatio_).to.eql(1);
+        expect(h.postProcessPasses_[1].uniforms_.length).to.eql(1);
+        expect(h.postProcessPasses_[1].uniforms_[0].value).to.eql(4);
+      });
+
+    });
+
+  });
+
+  describe('operations', function() {
+
+    describe('prepare draw', function() {
+
+      let h;
+      beforeEach(function() {
+        h = new WebGLHelper({
+          uniforms: {
+            u_test1: 42,
+            u_test2: [1, 3],
+            u_test3: document.createElement('canvas')
+          }
+        });
+        const vertexShader = new WebGLVertex(VERTEX_SHADER);
+        const fragmentShader = new WebGLFragment(FRAGMENT_SHADER);
+        h.useProgram(h.getProgram(fragmentShader, vertexShader));
+        h.prepareDraw({
+          pixelRatio: 2,
+          size: [50, 80],
+          viewState: {
+            rotation: 10,
+            resolution: 10,
+            center: [0, 0]
+          }
+        });
+      });
+
+      it('has resized the canvas', function() {
+        expect(h.getCanvas().width).to.eql(100);
+        expect(h.getCanvas().height).to.eql(160);
+      });
+
+      it('has processed uniforms', function() {
+        expect(h.uniforms_.length).to.eql(3);
+        expect(h.uniforms_[0].name).to.eql('u_test1');
+        expect(h.uniforms_[1].name).to.eql('u_test2');
+        expect(h.uniforms_[2].name).to.eql('u_test3');
+        expect(h.uniforms_[0].location).to.not.eql(-1);
+        expect(h.uniforms_[1].location).to.not.eql(-1);
+        expect(h.uniforms_[2].location).to.not.eql(-1);
+        expect(h.uniforms_[2].texture).to.not.eql(undefined);
+      });
+    });
+
+    describe('valid shader compiling', function() {
+      let h;
+      let p;
+      beforeEach(function() {
+        h = new WebGLHelper();
+
+        const vertexShader = new WebGLVertex(VERTEX_SHADER);
+        const fragmentShader = new WebGLFragment(FRAGMENT_SHADER);
+        p = h.getProgram(fragmentShader, vertexShader);
+        h.useProgram(p);
+      });
+
+      it('has saved the program', function() {
+        expect(h.currentProgram_).to.eql(p);
+      });
+
+      it('can find the uniform location', function() {
+        expect(h.getUniformLocation('u_test')).to.not.eql(null);
+      });
+
+      it('can find the attribute location', function() {
+        expect(h.getAttributeLocation('a_test')).to.not.eql(-1);
+      });
+
+      it('cannot find an unknown attribute location', function() {
+        expect(h.getAttributeLocation('a_test_missing')).to.eql(-1);
+      });
+    });
+
+    describe('invalid shader compiling', function() {
+      let h;
+      let p;
+      beforeEach(function() {
+        h = new WebGLHelper();
+
+        const vertexShader = new WebGLVertex(INVALID_VERTEX_SHADER);
+        const fragmentShader = new WebGLFragment(FRAGMENT_SHADER);
+        p = h.getProgram(fragmentShader, vertexShader);
+        h.useProgram(p);
+      });
+
+      it('has saved the program', function() {
+        expect(h.currentProgram_).to.eql(p);
+      });
+
+      it('cannot find the uniform location', function() {
+        expect(h.getUniformLocation('u_test')).to.eql(null);
+      });
+
+      it('cannot find the attribute location', function() {
+        expect(h.getAttributeLocation('a_test')).to.eql(-1);
+      });
+    });
+
+  });
+});