1 files changed, 92 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/js/tests/clipping-wide-points.js b/dom/canvas/test/webgl-conf/checkout/js/tests/clipping-wide-points.js
new file mode 100644
index 0000000000..6b8fc00599
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/js/tests/clipping-wide-points.js
@@ -0,0 +1,92 @@
+/*
+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.
+*/
+
+'use strict';
+description("This test ensures clipping works with wide points whose centers are out of the viewport");
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("testbed", undefined, contextVersion);
+
+var pointSize;
+
+function setupProgram() {
+    var vs = "attribute vec4 pos;" +
+        "uniform float pointSize; " +
+        "void main() {" +
+        "  gl_PointSize = pointSize;" +
+        "  gl_Position = pos;" +
+        "}";
+    var fs = "precision mediump float;" +
+        "void main() {" +
+        "  gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);" +
+        "}";
+    var program = wtu.setupProgram(gl, [vs, fs], ['pos']);
+    if (program) {
+        var loc = gl.getUniformLocation(program, 'pointSize');
+        gl.uniform1f(loc, pointSize);
+        gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 0, 0);
+        gl.enableVertexAttribArray(0);
+        wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors after setting up program");
+    }
+    return program;
+}
+
+function runOneTestCase(vertex) {
+    debug("");
+    debug("testing point at (" + vertex[0] + ", " + vertex[1] + ", " + vertex[2] + ")");
+    var data = new Float32Array(vertex);
+    gl.bufferSubData(gl.ARRAY_BUFFER, 0, data);
+
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    gl.drawArrays(gl.POINTS, 0, 1);
+    wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0]);
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors after running one test case");
+}
+
+function runTests() {
+    if (!gl) {
+        testFailed("context does not exist");
+        return;
+    }
+
+    var range = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE);
+    if (range[1] < 2.0) {
+        testPassed("ALIASDED_POINT_SIZE_RANGE less than 2");
+        return;
+    }
+    pointSize = 2.0;
+
+    var data = new Float32Array(4);
+    var buffer = gl.createBuffer();
+    gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
+    gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
+
+    var program = setupProgram();
+    if (!program) {
+        testFailed("fail to set up program");
+        return;
+    }
+
+    gl.disable(gl.BLEND);
+    gl.disable(gl.DITHER);
+    gl.disable(gl.DEPTH_TEST);
+
+    gl.clearColor(1.0, 0.0, 0.0, 1.0);
+
+    var vertices = [
+        [ 0.99, 0.5, 0.0, 1.0 ],
+        [ 1.01, 0.5, 0.0, 1.0 ],
+        [ 0.5, 0.99, 0.0, 1.0 ],
+        [ 0.5, 1.01, 0.0, 1.0 ],
+    ];
+    for (var idx = 0; idx < vertices.length; ++idx) {
+        runOneTestCase(vertices[idx]);
+    }
+}
+
+runTests();
+debug("");
+var successfullyParsed = true;