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+<!--
+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.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>WebGL OES_texture_half_float Conformance Tests</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>
+<canvas id="canvas2d" style="width: 50px; height: 50px;"> </canvas>
+<div id="console"></div>
+<script id="testFragmentShader" type="x-shader/x-fragment">
+precision mediump float;
+uniform sampler2D tex;
+uniform vec4 subtractor;
+varying vec2 texCoord;
+void main()
+{
+    vec4 color = texture2D(tex, texCoord);
+    if (abs(color.r - subtractor.r) +
+        abs(color.g - subtractor.g) +
+        abs(color.b - subtractor.b) +
+        abs(color.a - subtractor.a) < 8.0) {
+        gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
+    } else {
+        gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
+    }
+}
+</script>
+<!-- Shaders for testing half-floating-point render targets -->
+<script id="floatingPointFragmentShader" type="x-shader/x-fragment">
+void main()
+{
+    gl_FragColor = vec4(10000.0, 10000.0, 10000.0, 10000.0);
+}
+</script>
+<script>
+"use strict"
+description("This test verifies the functionality of OES_texture_half_float with null/non-null ArrayBufferView");
+
+debug("");
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("canvas");
+var colorCanvas = document.getElementById("canvas2d");
+colorCanvas.width = 2;
+colorCanvas.height = 2;
+var ctx = colorCanvas.getContext("2d");
+ctx.fillStyle = "rgb(255,0,0)";
+ctx.fillRect(0, 0, 2, 2);
+var gl = wtu.create3DContext(canvas);
+// This constant must be defined in order to run the texture creation test without the extension enabled.
+var halfFloatOESEnum = 0x8D61;
+var ext = null;
+
+
+if (!gl) {
+    testFailed("WebGL context does not exists");
+} else {
+    testPassed("WebGL context exists");
+
+    // Verify that allocation of texture fails if extension is not enabled
+    runTextureCreationTest(false);
+    ext = gl.getExtension("OES_texture_half_float")
+    if (!ext) {
+        testPassed("No OES_texture_half_float support. This is legal");
+    } else {
+        testPassed("Successfully enabled OES_texture_half_float extension");
+
+        var program = wtu.setupTexturedQuad(gl);
+
+        // Check if creation of texture succeed's with various formats and null ArrayBufferView
+        var formats = [
+          { format: gl.RGBA,            expected: [255,   0,   0, 255], },
+          { format: gl.RGB,             expected: [255,   0,   0, 255], },
+          { format: gl.LUMINANCE,       expected: [255, 255, 255, 255], },
+          { format: gl.ALPHA,           expected: [  0,   0,   0, 255], },
+          { format: gl.LUMINANCE_ALPHA, expected: [255, 255, 255, 255], },
+        ];
+        formats.forEach(function(f) {
+            runTextureCreationTest(true, f.format, null, f.expected);
+        });
+
+        // Texture creation should fail when passed with non-null, non-Uint16 ArrayBufferView
+        formats.forEach(function(f) {
+            var width = 2;
+            var height = 2;
+            var format = f.format;
+
+            // Float32Array
+            var float32Data = new Float32Array(width * height * getNumberOfChannels(format));
+            for (var ii = 0; ii < float32Data.length; ii++) {
+                float32Data[ii] = 1000;
+            }
+            runTextureCreationTest(true, format, float32Data, null);
+
+            // Int16Array
+            var int16Data = new Int16Array(width * height * getNumberOfChannels(format));
+            for (var ii = 0; ii <  int16Data.length; ii++) {
+                int16Data[ii] = 1000;
+            }
+            runTextureCreationTest(true, format, int16Data, null);
+        });
+
+        // Test that Uint16 encoded half float values can be used as texture data.
+
+        // First test that values in the 0-1 range can be written and read.
+        var halfFloatOneThird = 0x3555; // Half float 1/3
+        var uint16Formats = [
+          { format: gl.RGBA,            expected: [85, 85, 85,  85], },
+          { format: gl.RGB,             expected: [85, 85, 85, 255], },
+          { format: gl.LUMINANCE,       expected: [85, 85, 85, 255], },
+          { format: gl.ALPHA,           expected: [ 0,  0,  0,  85], },
+          { format: gl.LUMINANCE_ALPHA, expected: [85, 85, 85,  85], },
+        ];
+
+        uint16Formats.forEach(function(f) {
+            var width = 2;
+            var height = 2;
+            var format = f.format;
+
+            var uint16Data = new Uint16Array(width * height * getNumberOfChannels(format));
+            for (var ii = 0; ii <  uint16Data.length; ii++) {
+                uint16Data[ii] = halfFloatOneThird;
+            }
+            runTextureCreationTest(true, format, uint16Data, f.expected);
+        });
+
+        // Next check that values outside the 0-1 range can be written.
+        var halfFloatTenK = 0x70E2; // Half float 10000
+        var uint16Formats2 = [
+          { format: gl.RGBA, subtractor: [10000, 10000, 10000, 10000], requireRenderable: true},
+          { format: gl.RGB,  subtractor: [10000, 10000, 10000, 1], requireRenderable: false},
+        ];
+
+        uint16Formats2.forEach(function(f) {
+            var width = 2;
+            var height = 2;
+            var format = f.format;
+
+            var uint16Data = new Uint16Array(width * height * getNumberOfChannels(format));
+            for (var ii = 0; ii <  uint16Data.length; ii++) {
+                uint16Data[ii] = halfFloatTenK;
+            }
+            runRenderTest(format, f.subtractor, uint16Data, f.requireRenderable);
+        });
+
+        (function() {
+            debug("");
+            var renderable = isRenderable(gl, ext);
+            var renderableExtName = "EXT_color_buffer_half_float";
+            var supported = gl.getSupportedExtensions().includes(renderableExtName);
+            if (renderable && !supported) {
+                testFailed("RGBA/HALF_FLOAT_OES is color renderable but " + renderableExtName + " not exposed");
+            } else if (supported && !renderable) {
+                testFailed(renderableExtName + " is exposed but RGBA/HALF_FLOAT_OES is not color renderable");
+            }
+            if (supported) {
+                runRenderTest(gl.RGBA, [10000, 10000, 10000, 10000], null, true);
+                runRenderTest(gl.RGB, [10000, 10000, 10000, 1], null, false);
+                runFramebufferTest();
+            }
+        })();
+
+        // Check of getExtension() returns same object
+        runUniqueObjectTest();
+    }
+}
+
+function isRenderable(gl, ext) {
+    var tex = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_2D, tex);
+    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, ext.HALF_FLOAT_OES, null);
+
+    var fb = gl.createFramebuffer();
+    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
+    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
+
+    var status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
+    gl.deleteFramebuffer(fb);
+    gl.deleteTexture(tex);
+
+    return status == gl.FRAMEBUFFER_COMPLETE;
+}
+
+function getNumberOfChannels(format)
+{
+    if (format == gl.RGBA)
+        return 4;
+    else if (format == gl.RGB)
+        return 3;
+    else if (format == gl.LUMINANCE || format == gl.ALPHA)
+        return 1;
+    else if (format == gl.LUMINANCE_ALPHA)
+        return 2;
+}
+
+function allocateTexture()
+{
+    var texture = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_2D, texture);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texture parameter setup should succeed");
+    return texture;
+}
+
+function runTextureCreationTest(extensionEnabled, opt_format, opt_data, opt_expected)
+{
+    var format = opt_format || gl.RGBA;
+    var data = opt_data || null;
+    var expectSuccess = true;
+
+    if (!extensionEnabled || !opt_expected)
+        expectSuccess = false;
+    debug("Testing texture creation with extension " + (extensionEnabled ? "enabled" : "disabled") +
+          ", format " + wtu.glEnumToString(gl, format) + ", and data " + (data ? "non-null" : "null") +
+          ". Expect " + (expectSuccess ? "Success" : "Failure"));
+
+    var texture = allocateTexture();
+    var width = 2;
+    var height = 2;
+    gl.texImage2D(gl.TEXTURE_2D, 0, format, width, height, 0, format, halfFloatOESEnum, data);
+    if(!extensionEnabled) {
+        wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "Half floating point texture must be disallowed if OES_texture_half_float isn't enabled");
+        return;
+    } else if (!opt_expected) {
+        wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Half floating point texture allocation must be disallowed when ArrayBufferView is not-null and not-Uint16");
+        return;
+    } else {
+        wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Half floating point texture allocation should succeed if OES_texture_half_float is enabled");
+
+        if (!data) {
+            gl.texImage2D(gl.TEXTURE_2D, 0, format, format, halfFloatOESEnum, colorCanvas);
+        }
+        wtu.clearAndDrawUnitQuad(gl);
+        wtu.checkCanvas(gl, opt_expected);
+        // Check that linear fails.
+        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
+        wtu.clearAndDrawUnitQuad(gl);
+        wtu.checkCanvas(gl, [0, 0, 0, 255], "should be black");
+    }
+
+}
+
+function checkRenderingResults()
+{
+    wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
+}
+
+function runRenderTest(format, subtractor, data, requireRenderable)
+{
+    var formatString = wtu.glEnumToString(gl, format);
+
+    debug("");
+
+    if (!data) {
+        debug("Testing half floating point " + formatString + " render target");
+    } else {
+        debug("Testing half floating point " + formatString + " from a Uint16Array");
+    }
+
+    var texture = allocateTexture();
+    var width = 2;
+    var height = 2;
+
+    gl.texImage2D(gl.TEXTURE_2D, 0, format, width, height, 0, format, ext.HALF_FLOAT_OES, data);
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Half floating point texture allocation should succeed if OES_texture_half_float is enabled");
+
+    if (!data) {
+        // Try to use this texture as render target
+        var fbo = gl.createFramebuffer();
+        gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
+        gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
+        gl.bindTexture(gl.TEXTURE_2D, null);
+
+        // It is legal for a WebGL implementation exposing the OES_texture_half_float extension to
+        // support half floating point textures but not as attachments to framebuffer objects.
+        if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
+            if (requireRenderable) {
+                testFailed(formatString + " render targets not supported.");
+            } else {
+                debug(formatString + " render targets not supported -- this is legal");
+            }
+            return;
+        }
+
+        var renderProgram =
+            wtu.setupProgram(gl,
+                             [wtu.simpleVertexShader, "floatingPointFragmentShader"],
+                             ['vPosition'],
+                             [0]);
+        wtu.drawUnitQuad(gl);
+        wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Rendering to half floating point texture should succeed");
+    }
+
+    // Now sample from the half floating-point texture and verify we got the correct values.
+    var texturedShaders = [
+          wtu.simpleTextureVertexShader,
+          "testFragmentShader"
+      ];
+    var testProgram =
+        wtu.setupProgram(gl,
+                        [wtu.simpleTextureVertexShader, "testFragmentShader"],
+                        ['vPosition', 'texCoord0'],
+                        [0, 1]);
+    var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
+    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+    gl.bindTexture(gl.TEXTURE_2D, texture);
+    gl.useProgram(testProgram);
+    gl.uniform4fv(gl.getUniformLocation(testProgram, "subtractor"), subtractor);
+    wtu.drawUnitQuad(gl);
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "rendering from half floating point texture should succeed");
+    checkRenderingResults();
+}
+
+function runUniqueObjectTest()
+{
+    debug("");
+    debug("Testing that getExtension() returns the same object each time");
+    ext = null;
+    gl.getExtension("OES_texture_half_float").myProperty = 2;
+    webglHarnessCollectGarbage();
+    shouldBe('gl.getExtension("OES_texture_half_float").myProperty', '2');
+}
+
+// Make sure we can call readPixels with the passed in arrayBufferConstructor and that the color
+// channels are the ones we expect. If there is a mismatch between the glType and arrayBuffer type,
+// fail the test.
+function verifyReadPixelsColors(red, green, blue, alpha, alphaRGB, glFormat, glType, arrayBufferConstructor) {
+    var typeName = wtu.glEnumToString(gl, glType);
+
+    debug(wtu.glEnumToString(gl, glFormat) + " framebuffer with " + typeName + " readback.");
+
+    var arrayBuffer = new arrayBufferConstructor(4);
+    gl.readPixels(0, 0, 1, 1, gl.RGBA, glType, arrayBuffer);
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "readPixels should return NO_ERROR when reading " + typeName + " data.");
+
+    assertMsg(arrayBuffer[0] === red, "Red channel should be " + red + " for " + typeName + " readPixels. Received: " + arrayBuffer[0]);
+    assertMsg(arrayBuffer[1] === green, "Green channel should be " + green + " for " + typeName + " readPixels. Received: " + arrayBuffer[1]);
+    assertMsg(arrayBuffer[2] === blue, "Blue channel should be " + blue + " for " + typeName + " readPixels. Received: " + arrayBuffer[2]);
+    if (glFormat === gl.RGBA) {
+        assertMsg(arrayBuffer[3] === alpha, "Alpha channel should be " + alpha + " for " + typeName + " readPixels. Received: " + arrayBuffer[3]);
+    } else if (glFormat === gl.RGB) {
+        assertMsg(arrayBuffer[3] === alphaRGB, "Alpha channel should be " + alphaRGB + " for " + typeName + " readPixels. Received: " + arrayBuffer[3]);
+    }
+
+    // Make sure any arrayBuffer types that are not equal to arrayBufferConstructor fail readPixels.
+    if (arrayBufferConstructor !== Uint8Array) {
+        arrayBuffer = new Uint8Array(4);
+        gl.readPixels(0, 0, 1, 1, gl.RGBA, glType, arrayBuffer);
+        wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "readPixels should return INVALID_OPERATION when reading mismatched types. " + Uint8Array.toString());
+    }
+    if (arrayBufferConstructor !== Float32Array) {
+        arrayBuffer = new Float32Array(4);
+        gl.readPixels(0, 0, 1, 1, gl.RGBA, glType, arrayBuffer);
+        wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "readPixels should return INVALID_OPERATION when reading mismatched types. " + Float32Array.toString());
+    }
+    if (arrayBufferConstructor !== Uint16Array) {
+        arrayBuffer = new Uint16Array(4);
+        gl.readPixels(0, 0, 1, 1, gl.RGBA, glType, arrayBuffer);
+        wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "readPixels should return INVALID_OPERATION when reading mismatched types. " + Uint16Array.toString());
+    }
+}
+
+// Verify that half float textures attached to frame buffers function correctly with regard to framebuffer
+// completness, IMPLEMENTATION_COLOR_READ_FORMAT/TYPE and readPixels
+function runFramebufferTest() {
+    debug("");
+    debug("Framebuffer Tests");
+
+    var texture = allocateTexture();
+    gl.bindTexture(gl.TEXTURE_2D, texture);
+
+    var fbo = gl.createFramebuffer();
+    gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
+    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
+
+    debug("Ensure non-color-renderable formats [LUMINANCE, LUMINANCE_ALPHA, ALPHA] fail.");
+    var arrayBufferFloatOutput = new Float32Array(4); // 4 color channels
+    [gl.LUMINANCE, gl.LUMINANCE_ALPHA, gl.ALPHA].forEach(function(badFormat) {
+        debug(wtu.glEnumToString(gl, badFormat) + " framebuffer");
+
+        gl.texImage2D(gl.TEXTURE_2D, 0, badFormat, 1, 1, 0, badFormat, ext.HALF_FLOAT_OES, null);
+        shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT");
+
+        shouldBeNull("gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_FORMAT)");
+        wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "IMPLEMENTATION_COLOR_READ_FORMAT should fail for incomplete framebuffers.");
+
+        shouldBeNull("gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_TYPE)");
+        wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "IMPLEMENTATION_COLOR_READ_TYPE should fail for incomplete framebuffers.");
+
+        gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.FLOAT, arrayBufferFloatOutput);
+        wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION , "readPixels should fail on incomplete framebuffers.");
+        debug("");
+    });
+
+    debug("Ensure color renderable formats [RGBA, RGB] succeed.");
+    var arrayBufferHalfFloatInput = new Uint16Array(4); // 4 color channels
+    arrayBufferHalfFloatInput[0] = 0;      // 0 in half float
+    arrayBufferHalfFloatInput[1] = 0x3400; // 0.25 in half float
+    arrayBufferHalfFloatInput[2] = 0x3800; // 0.50 in half float
+    arrayBufferHalfFloatInput[3] = 0x3A00; // 0.75 in half float
+
+    [gl.RGBA, gl.RGB].forEach(function(goodFormat) {
+        debug(wtu.glEnumToString(gl, goodFormat) + " framebuffer tests");
+        debug("");
+
+        gl.texImage2D(gl.TEXTURE_2D, 0, goodFormat, 1, 1, 0, goodFormat, ext.HALF_FLOAT_OES, arrayBufferHalfFloatInput);
+        if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE) {
+            // Per the OES_color_buffer_half_float, RGBA/FLOAT should always succeed for readPixels
+            verifyReadPixelsColors(
+                0.00, // red
+                0.25, // green
+                0.50, // blue
+                0.75, // alpha
+                1.0,  // alphaRGB
+                goodFormat,
+                gl.FLOAT,
+                Float32Array);
+
+            var implementationColorReadFormat = gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_FORMAT);
+            assertMsg(implementationColorReadFormat === gl.RGBA || implementationColorReadFormat === gl.RGB,
+                "IMPLEMENTATION_COLOR_READ_FORMAT should be color renderable: RGBA or RGB. Received: " + wtu.glEnumToString(gl, implementationColorReadFormat));
+
+            var implementationColorReadType = gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_TYPE);
+
+            // There is nothing in the specifications that keeps the
+            // implementation color read format and type from being the
+            // same as the implicitly supported one. For this reason, keep
+            // gl.FLOAT as one of the valid options.
+            assertMsg(implementationColorReadType === gl.UNSIGNED_BYTE ||
+                      implementationColorReadType === gl.FLOAT ||
+                      implementationColorReadType === ext.HALF_FLOAT_OES ||
+                      implementationColorReadType === gl.UNSIGNED_SHORT_4_4_4_4 ||
+                      implementationColorReadType === gl.UNSIGNED_SHORT_5_5_5_1 ||
+                      implementationColorReadType === gl.UNSIGNED_SHORT_5_6_5,
+                      "IMPLEMENTATION_COLOR_READ_TYPE must be one of UNSIGNED_BYTE, UNSIGNED_SHORT_4_4_4_4, UNSIGNED_SHORT_5_5_5_1, UNSIGNED_SHORT_5_6_5, FLOAT, or HALF_FLOAT_OES. " +
+                      "Received: " + wtu.glEnumToString(gl, implementationColorReadType));
+
+            // Test the RGBA/HALF_FLOAT_OES combination
+            if (implementationColorReadFormat === gl.RGBA && implementationColorReadType === ext.HALF_FLOAT_OES) {
+                verifyReadPixelsColors(
+                    0,      // red
+                    0x3400, // green
+                    0x3800, // blue
+                    0x3A00, // alpha
+                    0x3C00, // alphaRGB
+                    goodFormat,
+                    ext.HALF_FLOAT_OES,
+                    Uint16Array);
+            }
+        }
+        debug("");
+    });
+}
+
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>