1 files changed, 183 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/js/tests/iterable-test.js b/dom/canvas/test/webgl-conf/checkout/js/tests/iterable-test.js
new file mode 100644
index 0000000000..45e509f50a
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+++ b/dom/canvas/test/webgl-conf/checkout/js/tests/iterable-test.js
@@ -0,0 +1,183 @@
+/*
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+*/
+IterableTest = (function() {
+
+  var wtu = WebGLTestUtils;
+
+  function run(test, iterations) {
+    var target = iterations || 10;
+    var count = 0;
+
+    function doNextTest() {
+      ++count;
+      debug("Test " + count + " of " + target);
+      var success = test();
+      if (count < target && success !== false) {
+        wtu.dispatchPromise(doNextTest);
+      } else {
+        finishTest();
+      }
+    }
+
+    doNextTest();
+  }
+
+  // Creates a canvas and a texture then exits. There are
+  // no references to either so both should be garbage collected.
+  function createContextCreationAndDestructionTest() {
+    var textureSize = null;
+
+    return function() {
+      var canvas = document.createElement("canvas");
+      // This is safe for any device. See drawingBufferWidth in spec.
+      canvas.width = 2048;
+      canvas.height = 2048;
+      var gl = wtu.create3DContext(canvas);
+      if (textureSize === null) {
+        var maxTextureSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);
+        textureSize = Math.min(1024, maxTextureSize);
+      }
+      var tex = gl.createTexture();
+      gl.bindTexture(gl.TEXTURE_2D, tex);
+      gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, textureSize, textureSize, 0, gl.RGBA, gl.UNSIGNED_BYTE,
+                    null);
+      gl.clear(gl.COLOR_BUFFER_BIT);
+      wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors");
+
+      return true;
+    };
+  }
+
+  // Creates many small canvases and attaches them to the DOM.
+  // This tests an edge case discovered in Chrome where the creation of multiple
+  // WebGL contexts would eventually lead to context creation failure.
+  // (crbug.com/319265) The test does not require that old contexts remain
+  // valid, only that new ones can be created.
+  function createContextCreationTest() {
+    return function() {
+      var canvas = document.createElement("canvas");
+      canvas.width = 1;
+      canvas.height = 1;
+
+      document.body.appendChild(canvas);
+
+      var gl = wtu.create3DContext(canvas);
+      if (!gl) {
+        return false;
+      }
+
+      gl.clear(gl.COLOR_BUFFER_BIT);
+      wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors");
+
+      return true;
+    };
+  }
+
+  // Draws rectangle on a passed canvas with preserveDrawingBuffer
+  // and antialiasing ON, tests rect color on every iteration.
+  function createMultisampleCorruptionTest(gl) {
+    var lastContext = null;
+    // Allocate a read back buffer in advance and reuse it for all iterations
+    // to avoid memory issues because of late garbage collection.
+    var readBackBuf = new Uint8Array(gl.canvas.width * gl.canvas.height * 4);
+
+    var program = wtu.loadStandardProgram(gl);
+    var uniforms = wtu.getUniformMap(gl, program);
+    gl.useProgram(program);
+
+    gl.clearColor(1.0, 0.0, 0.0, 1.0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    var vertexObject = gl.createBuffer();
+    gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
+    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,2.5,0, 1.5,1.5,0, 2.5,1.5,0 ]), gl.STATIC_DRAW);
+    gl.enableVertexAttribArray(0);
+    gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
+    gl.vertexAttrib3f(1, 0.0, 0.0, 1.0);
+
+    var identityMat = new Float32Array([
+      1, 0, 0, 0,
+      0, 1, 0, 0,
+      0, 0, 1, 0,
+      0, 0, 0, 1
+    ]);
+
+    gl.uniformMatrix4fv(uniforms.u_modelViewProjMatrix.location, false, identityMat);
+
+    function test() {
+      var gl2 = wtu.create3DContext(null, {antialias: true});
+
+      gl2.canvas.width = gl2.canvas.height = 1024;
+      gl2.canvas.style.width = gl2.canvas.style.height = "1px";
+      document.body.appendChild(gl2.canvas);
+
+      gl2.clearColor(1.0, 0.0, 0.0, 1.0);
+      gl2.clear(gl2.COLOR_BUFFER_BIT);
+
+      if(lastContext) {
+          gl.drawArrays(gl.TRIANGLES, 0, 3);
+          var msg = "Canvas should be red";
+          wtu.checkCanvasRectColor(gl,
+              0, 0, gl.canvas.width, gl.canvas.height,
+              [255, 0, 0, 255], null,
+              function() {
+                  testPassed(msg);
+              },
+              function() {
+                  testFailed(msg);
+                  return false;
+              },
+          debug, readBackBuf);
+          document.body.removeChild(lastContext.canvas);
+      }
+
+      lastContext = gl2;
+      return true;
+    };
+
+    // First pass does initialization
+    test();
+
+    return test;
+  }
+
+  // Draws repeatedly to a large canvas with preserveDrawingBuffer enabled to
+  // try and provoke a context loss.
+  function createPreserveDrawingBufferLeakTest(gl) {
+    var contextActive = true;
+    gl.canvas.addEventListener("webglcontextlost", () => {
+      testFailed("Context was lost");
+      contextActive = false;
+    });
+
+    function test() {
+      var x = Math.random() * gl.drawingBufferWidth;
+      var y = Math.random() * gl.drawingBufferHeight;
+      var width = Math.random() * (gl.drawingBufferWidth - x);
+      var height = Math.random() * (gl.drawingBufferHeight - y);
+
+      gl.enable(gl.SCISSOR_TEST);
+      gl.scissor(x, y, width, height);
+      gl.clearColor(Math.random(), Math.random(), Math.random(), 1.0);
+      gl.clear(gl.COLOR_BUFFER_BIT);
+      wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors");
+
+      return contextActive;
+    };
+
+    return test;
+  }
+
+  return {
+    run: run,
+
+    createContextCreationAndDestructionTest: createContextCreationAndDestructionTest,
+    createContextCreationTest: createContextCreationTest,
+    createMultisampleCorruptionTest: createMultisampleCorruptionTest,
+    createPreserveDrawingBufferLeakTest: createPreserveDrawingBufferLeakTest
+  };
+
+})();