/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES Utilities
 * ------------------------------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

'use strict';
goog.provide('functional.gles3.es3fShaderPackingFunctionTests');
goog.require('framework.common.tcuFloat');
goog.require('framework.common.tcuMatrixUtil');
goog.require('framework.common.tcuTestCase');
goog.require('framework.delibs.debase.deMath');
goog.require('framework.delibs.debase.deRandom');
goog.require('framework.delibs.debase.deString');
goog.require('framework.opengl.gluShaderProgram');
goog.require('framework.opengl.gluShaderUtil');
goog.require('framework.opengl.gluVarType');
goog.require('modules.shared.glsShaderExecUtil');


goog.scope(function() {
	var es3fShaderPackingFunctionTests = functional.gles3.es3fShaderPackingFunctionTests;
	var tcuFloat = framework.common.tcuFloat;
	var tcuTestCase = framework.common.tcuTestCase;
	var deMath = framework.delibs.debase.deMath;
	var deRandom = framework.delibs.debase.deRandom;
	var deString = framework.delibs.debase.deString;
	var gluShaderProgram = framework.opengl.gluShaderProgram;
	var gluShaderUtil = framework.opengl.gluShaderUtil;
	var gluVarType = framework.opengl.gluVarType;
	var glsShaderExecUtil = modules.shared.glsShaderExecUtil;
	var tcuMatrixUtil = framework.common.tcuMatrixUtil;
	/**
	 * @param {number} a
	 * @param {number} b
	 * @return {number}
	 */
	es3fShaderPackingFunctionTests.getUlpDiff = function(a, b) {
		/** @type {number} */ var aBits	= tcuFloat.newFloat32(a).bits();
		/** @type {number} */ var bBits	= tcuFloat.newFloat32(b).bits();
		return aBits > bBits ? aBits - bBits : bBits - aBits;
	};

	/**
	 * @constructor
	 * @extends {tcuTestCase.DeqpTest}
	 * @param {string} name
	 * @param {string} description
	 * @param {gluShaderProgram.shaderType} shaderType
	 */
	es3fShaderPackingFunctionTests.ShaderPackingFunctionCase = function(name, description, shaderType) {
		tcuTestCase.DeqpTest.call(this, name, description);
		/** @type {gluShaderProgram.shaderType} */ this.m_shaderType = shaderType;
		/** @type {?glsShaderExecUtil.ShaderSpec} */ this.m_spec = new glsShaderExecUtil.ShaderSpec();
		/** @type {?glsShaderExecUtil.ShaderExecutor} */ this.m_executor = null;
	};

	es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype = Object.create(tcuTestCase.DeqpTest.prototype);
	es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype.constructor = es3fShaderPackingFunctionTests.ShaderPackingFunctionCase;

	es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype.init = function() {
		assertMsgOptions(!this.m_executor, 'Error: Executor is not null.', false, true);
		this.m_executor = glsShaderExecUtil.createExecutor(this.m_shaderType, this.m_spec);
		if (!this.m_executor.isOk())
			throw new Error('Compile failed');
	};

	es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype.deinit = function() {
		this.m_executor = null;
	};

	/**
	 *	@param {gluShaderUtil.precision} precision
	 * @return {string}
	 */
	es3fShaderPackingFunctionTests.getPrecisionPostfix = function(precision) {
		/** @type {Array<string>} */ var s_postfix = [
			'_lowp',
			'_mediump',
			'_highp'
		];
		assertMsgOptions(0 <= precision && precision < s_postfix.length, 'Error: Out of range', false, true);
		return s_postfix[precision];
	};

	/**
	 *	@param {gluShaderProgram.shaderType} shaderType
	 * @return {string}
	 */
	es3fShaderPackingFunctionTests.getShaderTypePostfix = function(shaderType) {
		/** @type {Array<string>} */ var s_postfix = [
			'_vertex',
			'_fragment'
		];
		assertMsgOptions(0 <= shaderType && shaderType < s_postfix.length, 'Error Out of range', false, true);
		return s_postfix[shaderType];
	};

	/**
	 * @constructor
	 * @extends {es3fShaderPackingFunctionTests.ShaderPackingFunctionCase}
	 * @param {gluShaderProgram.shaderType} shaderType
	 * @param {gluShaderUtil.precision} precision
	 */
	es3fShaderPackingFunctionTests.PackSnorm2x16Case = function(shaderType, precision) {
		/** @const {string} */ var name = 'packsnorm2x16' +
			es3fShaderPackingFunctionTests.getPrecisionPostfix(precision) +
			es3fShaderPackingFunctionTests.getShaderTypePostfix(shaderType);
		es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.call(this, name, 'packSnorm2x16', shaderType);
		this.m_precision = precision;

		this.m_spec.inputs.push(new glsShaderExecUtil.Symbol('in0', gluVarType.newTypeBasic(gluShaderUtil.DataType.FLOAT_VEC2, precision)));
		this.m_spec.outputs.push(new glsShaderExecUtil.Symbol('out0', gluVarType.newTypeBasic(gluShaderUtil.DataType.UINT, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.source = 'out0 = packSnorm2x16(in0);';
	};

	es3fShaderPackingFunctionTests.PackSnorm2x16Case.prototype = Object.create(es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype);
	es3fShaderPackingFunctionTests.PackSnorm2x16Case.prototype.constructor = es3fShaderPackingFunctionTests.PackSnorm2x16Case;

	/**
	 * @return {tcuTestCase.IterateResult}
	 */
	es3fShaderPackingFunctionTests.PackSnorm2x16Case.prototype.iterate = function() {
		/** @type {deRandom.Random} */ var rnd = new deRandom.Random(deString.deStringHash(this.name) ^ 0x776002);
		/** @type {Array<Array<number>>} */ var inputs = [];
		/** @type {goog.TypedArray} */ var outputs; // deUint32
		/** @type {goog.TypedArray} */ var shaderExecutorOutput;
		/** @type {number} */ var maxDiff = this.m_precision == gluShaderUtil.precision.PRECISION_HIGHP ? 1 : // Rounding only.
											this.m_precision == gluShaderUtil.precision.PRECISION_MEDIUMP ? 33 : // (2^-10) * (2^15) + 1
											this.m_precision == gluShaderUtil.precision.PRECISION_LOWP ? 129 : 0; // (2^-8) * (2^15) + 1
		/** @type {number} */ var x;
		/** @type {number} */ var y;
		// Special values to check.
		inputs.push([0.0, 0.0]);
		inputs.push([-1.0, 1.0]);
		inputs.push([0.5, -0.5]);
		inputs.push([-1.5, 1.5]);
		inputs.push([0.25, -0.75]);

		// Random values, mostly in range.
		for (var ndx = 0; ndx < 15; ndx++) {
			x = rnd.getFloat() * 2.5 - 1.25;
			y = rnd.getFloat() * 2.5 - 1.25;
			inputs.push([x, y]);
		}

		// Large random values.
		for (var ndx = 0; ndx < 80; ndx++) {
			x = rnd.getFloat() * 1e6 - 0.5e6;
			y = rnd.getFloat() * 1e6 - 0.5e6;
			inputs.push([x, y]);
		}

		bufferedLogToConsole('Executing shader for ' + inputs.length + ' input values');

		this.m_executor.useProgram();
		shaderExecutorOutput = this.m_executor.execute(inputs.length, [tcuMatrixUtil.flatten(inputs)])[0];

		// Convert outputs if we get them as Uint8Array.
		// - VertexShaderExecutor.execute() returns either an array of Uint8Array
		// - FragmentShaderExecutor.execute() returns either an array of Uint8Array or Uint32Array
	    outputs = new Uint32Array(shaderExecutorOutput.buffer);

		// Verify
		/** @type {number} */ var numValues = inputs.length;
		/** @type {number} */ var maxPrints = 10;
		/** @type {number} */ var numFailed = 0;

		for (var valNdx = 0; valNdx < numValues; valNdx++) {
			/** @type {number} */ var ref0 = (deMath.clamp(Math.floor(deMath.clamp(inputs[valNdx][0], -1.0, 1.0) * 32767.0), -(1 << 15), (1 << 15) - 1)) & 0xFFFF;
			/** @type {number} */ var ref1 = (deMath.clamp(Math.floor(deMath.clamp(inputs[valNdx][1], -1.0, 1.0) * 32767.0), -(1 << 15), (1 << 15) - 1)) & 0xFFFF;
			/** @type {number} */ var ref = (ref1 << 16) | ref0;
			/** @type {number} */ var res = outputs[valNdx];
			/** @type {number} */ var res0 = (res & 0xffff);
			/** @type {number} */ var res1 = deMath.shiftRight(res, 16);
			/** @type {number} */ var diff0 = Math.abs(ref0 - res0);
			/** @type {number} */ var diff1 = Math.abs(ref1 - res1);

			if (diff0 > maxDiff || diff1 > maxDiff) {
				if (numFailed < maxPrints) {
					bufferedLogToConsole(
						'ERROR: Mismatch in value ' + valNdx +
						', expected packSnorm2x16(' + inputs[valNdx] + ') = ' + ref + //tcu::toHex(ref)
						', got ' + res + // tcu::toHex(res)
						'\n  diffs = (' + diff0 + ', ' + diff1 + '), max diff = ' + maxDiff);
				}
				else if (numFailed == maxPrints)
					bufferedLogToConsole('...');

				numFailed += 1;
			}
		}

		bufferedLogToConsole((numValues - numFailed) + ' / ' + numValues + ' values passed');

		/** @type {boolean} */ var isOk = numFailed === 0;
		if (!isOk)
			testFailedOptions('Result comparison failed', false);
        else
            testPassedOptions('Pass', true);

		return tcuTestCase.IterateResult.STOP;
	};


	/**
	 * @constructor
	 * @extends {es3fShaderPackingFunctionTests.ShaderPackingFunctionCase}
	 * @param {gluShaderProgram.shaderType} shaderType
	 */
	es3fShaderPackingFunctionTests.UnpackSnorm2x16Case = function(shaderType) {
		/** @const {string} */ var name = 'unpacksnorm2x16' + es3fShaderPackingFunctionTests.getShaderTypePostfix(shaderType);
		es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.call(this, name, 'unpackSnorm2x16', shaderType);

		this.m_spec.inputs.push(new glsShaderExecUtil.Symbol('in0', gluVarType.newTypeBasic(gluShaderUtil.DataType.UINT, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.outputs.push(new glsShaderExecUtil.Symbol('out0', gluVarType.newTypeBasic(gluShaderUtil.DataType.FLOAT_VEC2, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.source = 'out0 = unpackSnorm2x16(in0);';
	};

	es3fShaderPackingFunctionTests.UnpackSnorm2x16Case.prototype = Object.create(es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype);
	es3fShaderPackingFunctionTests.UnpackSnorm2x16Case.prototype.constructor = es3fShaderPackingFunctionTests.UnpackSnorm2x16Case;

	/**
	 * @return {tcuTestCase.IterateResult}
	 */
	es3fShaderPackingFunctionTests.UnpackSnorm2x16Case.prototype.iterate = function() {
		/** @type {number} */ var maxDiff = 1; // Rounding error.
		/** @type {deRandom.Random} */ var rnd = new deRandom.Random(deString.deStringHash(this.name) ^ 0x776002);
		/** @type {Array<number>} */ var inputs = [];
		/** @type {goog.TypedArray} */ var shaderExecutorOutput; //vector<vec2<float>>
		/** @type {goog.TypedArray} */ var outputs; //vector<vec2<float>>

		inputs.push(0x00000000);
		inputs.push(0x7fff8000);
		inputs.push(0x80007fff);
		inputs.push(0xffffffff);
		inputs.push(0x0001fffe);

		// Random values.
		for (var ndx = 0; ndx < 95; ndx++)
			inputs.push(rnd.getInt());

		bufferedLogToConsole('Executing shader for ' + inputs.length + ' input values');

		this.m_executor.useProgram();
		shaderExecutorOutput = this.m_executor.execute(inputs.length, [inputs])[0]; // This test case only has one output

		// Convert outputs if we get them as Uint8Array.
		// - VertexShaderExecutor.execute() returns either an array of Uint8Array
		// - FragmentShaderExecutor.execute() returns either an array of Uint8Array or Uint32Array
		outputs = new Float32Array(shaderExecutorOutput.buffer);

		// Verify
		/** @type {number} */ var numValues = inputs.length;
		/** @type {number} */ var maxPrints = 10;
		/** @type {number} */ var numFailed = 0;

		for (var valNdx = 0; valNdx < inputs.length; valNdx++) {
			/** @type {number} */ var in0 = Math.floor(inputs[valNdx] & 0xffff);
			// Convert 16-bit uint to 16-bit int
			var view = new DataView(new ArrayBuffer(4));
			view.setUint16(0, in0, true);
			in0 = view.getInt16(0, true);
			/** @type {number} */ var in1 = Math.floor(deMath.shiftRight(inputs[valNdx], 16));
			// Convert 16-bit uint to 16-bit int
			var view = new DataView(new ArrayBuffer(4));
			view.setUint16(0, in1, true);
			in1 = view.getInt16(0, true);
			/** @type {number} */ var ref0 = deMath.clamp(in0 / 32767., -1.0, 1.0);
			/** @type {number} */ var ref1 = deMath.clamp(in1 / 32767., -1.0, 1.0);
			/** @type {number} */ var res0 = outputs[2 * valNdx];
			/** @type {number} */ var res1 = outputs[2 * valNdx + 1];

			/** @type {number} */ var diff0 = es3fShaderPackingFunctionTests.getUlpDiff(ref0, res0);
			/** @type {number} */ var diff1 = es3fShaderPackingFunctionTests.getUlpDiff(ref1, res1);

			if (diff0 > maxDiff || diff1 > maxDiff) {
				if (numFailed < maxPrints)
					bufferedLogToConsole('ERROR: Mismatch in value ' + valNdx + ',\n' +
				    	'  expected unpackSnorm2x16(' + inputs[valNdx].toString(16) + ') = ' +
				    	'vec2(' + ref0.toString(16) + ', ' + ref1.toString(16) + ')' +
				    	', got vec2(' + res0.toString(16) + ', ' + res1.toString(16) + ')' +
				    	'\n  ULP diffs = (' + diff0 + ', ' + diff1 + '), max diff = ' + maxDiff);
				else if (numFailed == maxPrints)
					bufferedLogToConsole('...');

				numFailed += 1;
			}
		}

		bufferedLogToConsole((numValues - numFailed) + ' / ' + numValues + ' values passed');

		/** @type {boolean} */ var isOk = numFailed === 0;
		if (!isOk)
			testFailedOptions('Result comparison failed', false);
		else
			testPassedOptions('Pass', true);

		return tcuTestCase.IterateResult.STOP;
	};

	/**
	 * @constructor
	 * @extends {es3fShaderPackingFunctionTests.ShaderPackingFunctionCase}
	 * @param {gluShaderProgram.shaderType} shaderType
	 * @param {gluShaderUtil.precision} precision
	 */
	es3fShaderPackingFunctionTests.PackUnorm2x16Case = function(shaderType, precision) {
		/** @const {string} */ var name = 'packunorm2x16' +
		 	es3fShaderPackingFunctionTests.getPrecisionPostfix(precision) +
			es3fShaderPackingFunctionTests.getShaderTypePostfix(shaderType);
		es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.call(this, name, 'packUnorm2x16', shaderType);
		this.m_precision = precision;

		this.m_spec.inputs.push(new glsShaderExecUtil.Symbol('in0', gluVarType.newTypeBasic(gluShaderUtil.DataType.FLOAT_VEC2, precision)));
		this.m_spec.outputs.push(new glsShaderExecUtil.Symbol('out0', gluVarType.newTypeBasic(gluShaderUtil.DataType.UINT, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.source = 'out0 = packUnorm2x16(in0);';
	};

	es3fShaderPackingFunctionTests.PackUnorm2x16Case.prototype = Object.create(es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype);
	es3fShaderPackingFunctionTests.PackUnorm2x16Case.prototype.constructor = es3fShaderPackingFunctionTests.PackUnorm2x16Case;

	/**
	 * @return {tcuTestCase.IterateResult}
	 */
	es3fShaderPackingFunctionTests.PackUnorm2x16Case.prototype.iterate = function() {
		/** @type {deRandom.Random} */ var rnd = new deRandom.Random(deString.deStringHash(this.name) ^ 0x776002);
		/** @type {Array<Array<number>>} */ var inputs = [];
		/** @type {goog.TypedArray} */ var shaderExecutorOutput;
		/** @type {goog.TypedArray} */ var outputs; // deUint32
		/** @type {number} */ var maxDiff = this.m_precision == gluShaderUtil.precision.PRECISION_HIGHP ? 1 : // Rounding only.
											this.m_precision == gluShaderUtil.precision.PRECISION_MEDIUMP ? 65 : // (2^-10) * (2^16) + 1
											this.m_precision == gluShaderUtil.precision.PRECISION_LOWP ? 257 : 0; // (2^-8) * (2^16) + 1
		/** @type {number} */ var x;
		/** @type {number} */ var y;
		// Special values to check.
		inputs.push([0.0, 0.0]);
		inputs.push([0.5, 1.0]);
		inputs.push([1.0, 0.5]);
		inputs.push([-0.5, 1.5]);
		inputs.push([0.25, 0.75]);

		// Random values, mostly in range.
		for (var ndx = 0; ndx < 15; ndx++) {
			x = rnd.getFloat() * 1.25;
			y = rnd.getFloat() * 1.25;
			inputs.push([x, y]);
		}

		// Large random values.
		for (var ndx = 0; ndx < 80; ndx++) {
			x = rnd.getFloat() * 1e6 - 1e5;
			y = rnd.getFloat() * 1e6 - 1e5;
			inputs.push([x, y]);
		}

		bufferedLogToConsole('Executing shader for ' + inputs.length + ' input values');

		this.m_executor.useProgram();
		shaderExecutorOutput  = this.m_executor.execute(inputs.length, [tcuMatrixUtil.flatten(inputs)])[0];

		// Convert outputs if we get them as Uint8Array.
		// - VertexShaderExecutor.execute() returns either an array of Uint8Array
		// - FragmentShaderExecutor.execute() returns either an array of Uint8Array or Uint32Array
	    outputs = new Uint32Array(shaderExecutorOutput.buffer);

		// Verify
		/** @type {number} */ var numValues = inputs.length;
		/** @type {number} */ var maxPrints = 10;
		/** @type {number} */ var numFailed = 0;

		for (var valNdx = 0; valNdx < inputs.length; valNdx++) {
			/** @type {number} */ var ref0 = deMath.clamp(Math.floor(deMath.clamp(inputs[valNdx][0], 0.0, 1.0) * 65535.0), 0, (1 << 16) - 1) & 0xFFFF;
			/** @type {number} */ var ref1 = deMath.clamp(Math.floor(deMath.clamp(inputs[valNdx][1], 0.0, 1.0) * 65535.0), 0, (1 << 16) - 1) & 0xFFFF;
			/** @type {number} */ var ref = (ref1 << 16) | ref0;
			/** @type {number} */ var res = outputs[valNdx];
			/** @type {number} */ var res0 = (res & 0xffff);
			/** @type {number} */ var res1 = deMath.shiftRight(res, 16);
			/** @type {number} */ var diff0 = Math.abs(ref0 - res0);
			/** @type {number} */ var diff1 = Math.abs(ref1 - res1);

			if (diff0 > maxDiff || diff1 > maxDiff) {
				if (numFailed < maxPrints)
					bufferedLogToConsole('ERROR: Mismatch in value ' + valNdx +
										 ', expected packUnorm2x16(' + inputs[valNdx] + ') = ' + ref /*tcu::toHex(ref)*/ +
										 ', got ' + res /*tcu::toHex(res)*/ +
										 '\n  diffs = (' + diff0 + ', ' + diff1 + '), max diff = ' + maxDiff);
				else if (numFailed === maxPrints)
					bufferedLogToConsole('...');

				numFailed += 1;
			}
		}

		bufferedLogToConsole((numValues - numFailed) + ' / ' + numValues + ' values passed');

		/** @type {boolean} */ var isOk = numFailed === 0;
		if (!isOk)
			testFailedOptions('Result comparison failed', false);
		else
			testPassedOptions('Pass', true);

		return tcuTestCase.IterateResult.STOP;
	};

	/**
	 * @constructor
	 * @extends {es3fShaderPackingFunctionTests.ShaderPackingFunctionCase}
	 * @param {gluShaderProgram.shaderType} shaderType
	 */
	es3fShaderPackingFunctionTests.UnpackUnorm2x16Case = function(shaderType) {
		/** @const {string} */ var name = 'unpackunorm2x16' +
			es3fShaderPackingFunctionTests.getShaderTypePostfix(shaderType);
		es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.call(this, name, 'unpackUnorm2x16', shaderType);

		this.m_spec.inputs.push(new glsShaderExecUtil.Symbol('in0', gluVarType.newTypeBasic(gluShaderUtil.DataType.UINT, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.outputs.push(new glsShaderExecUtil.Symbol('out0', gluVarType.newTypeBasic(gluShaderUtil.DataType.FLOAT_VEC2, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.source = 'out0 = unpackUnorm2x16(in0);';
	};

	es3fShaderPackingFunctionTests.UnpackUnorm2x16Case.prototype = Object.create(es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype);
	es3fShaderPackingFunctionTests.UnpackUnorm2x16Case.prototype.constructor = es3fShaderPackingFunctionTests.UnpackUnorm2x16Case;

	/**
	 * @return {tcuTestCase.IterateResult}
	 */
	es3fShaderPackingFunctionTests.UnpackUnorm2x16Case.prototype.iterate = function() {
		/** @type {number} */ var maxDiff = 1; // Rounding error.
		/** @type {deRandom.Random} */ var rnd = new deRandom.Random(deString.deStringHash(this.name) ^ 0x776002);
		/** @type {Array<number>} */ var inputs = [];
		/** @type {goog.TypedArray} */ var shaderExecutorOutput;
		/** @type {goog.TypedArray} */ var outputs; //vector<vec2>

		inputs.push(0x00000000);
		inputs.push(0x7fff8000);
		inputs.push(0x80007fff);
		inputs.push(0xffffffff);
		inputs.push(0x0001fffe);

		// Random values.
		for (var ndx = 0; ndx < 95; ndx++)
			inputs.push(rnd.getInt());

		bufferedLogToConsole('Executing shader for ' + inputs.length + ' input values');

		this.m_executor.useProgram();
		shaderExecutorOutput  = this.m_executor.execute(inputs.length, [inputs])[0];

		// Convert outputs if we get them as Uint8Array.
		// - VertexShaderExecutor.execute() returns either an array of Uint8Array
		// - FragmentShaderExecutor.execute() returns either an array of Uint8Array or Uint32Array
		outputs = new Float32Array(shaderExecutorOutput.buffer);

		// Verify
		/** @type {number} */ var numValues = inputs.length;
		/** @type {number} */ var maxPrints = 10;
		/** @type {number} */ var numFailed = 0;

		for (var valNdx = 0; valNdx < inputs.length; valNdx++) {
			/** @type {number} */ var in0 = Math.floor(inputs[valNdx] & 0xffff);
			/** @type {number} */ var in1 = Math.floor(deMath.shiftRight(inputs[valNdx], 16));
			/** @type {number} */ var ref0 = in0 / 65535.0;
			/** @type {number} */ var ref1 = in1 / 65535.0;
			/** @type {number} */ var res0 = outputs[2 * valNdx];
			/** @type {number} */ var res1 = outputs[2 * valNdx + 1];

			/** @type {number} */ var diff0 = es3fShaderPackingFunctionTests.getUlpDiff(ref0, res0);
			/** @type {number} */ var diff1 = es3fShaderPackingFunctionTests.getUlpDiff(ref1, res1);

			if (diff0 > maxDiff || diff1 > maxDiff) {
				if (numFailed < maxPrints)
					bufferedLogToConsole('ERROR: Mismatch in value ' + valNdx + ',\n' +
									     '  expected unpackUnorm2x16(' + inputs[valNdx].toString(16) + ') = ' +
									     'vec2(' + ref0.toString(16) + ', ' + ref1.toString(16) + ')' +
									     ', got vec2(' + res0.toString(16) + ', ' + res1.toString(16) + ')' +
									     '\n  ULP diffs = (' + diff0 + ', ' + diff1 + '), max diff = ' + maxDiff);
				else if (numFailed === maxPrints)
					bufferedLogToConsole('...');

				numFailed += 1;
			}
		}

		bufferedLogToConsole((numValues - numFailed) + ' / ' + numValues + ' values passed');

		/** @type {boolean} */ var isOk = numFailed === 0;
		if (!isOk)
			testFailedOptions('Result comparison failed', false);
		else
			testPassedOptions('Pass', true);

		return tcuTestCase.IterateResult.STOP;
	};

	/**
	 * @constructor
	 * @extends {es3fShaderPackingFunctionTests.ShaderPackingFunctionCase}
	 * @param {gluShaderProgram.shaderType} shaderType
	 */
	es3fShaderPackingFunctionTests.PackHalf2x16Case = function(shaderType) {
		/** @const {string} */ var name = 'packhalf2x16' +
			es3fShaderPackingFunctionTests.getShaderTypePostfix(shaderType);
		es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.call(this, name, 'packHalf2x16', shaderType);

		this.m_spec.inputs.push(new glsShaderExecUtil.Symbol('in0', gluVarType.newTypeBasic(gluShaderUtil.DataType.FLOAT_VEC2, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.outputs.push(new glsShaderExecUtil.Symbol('out0', gluVarType.newTypeBasic(gluShaderUtil.DataType.UINT, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.source = 'out0 = packHalf2x16(in0);';
	};

	es3fShaderPackingFunctionTests.PackHalf2x16Case.prototype = Object.create(es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype);
	es3fShaderPackingFunctionTests.PackHalf2x16Case.prototype.constructor = es3fShaderPackingFunctionTests.PackHalf2x16Case;

	/**
	 * @return {tcuTestCase.IterateResult}
	 */
	es3fShaderPackingFunctionTests.PackHalf2x16Case.prototype.iterate = function() {
		/** @type {number} */ var maxDiff = 0; // Values can be represented exactly in mediump.
		/** @type {deRandom.Random} */ var rnd = new deRandom.Random(deString.deStringHash(this.name) ^ 0x776002);
		/** @type {Array<Array<number>>} */ var inputs = [];
		/** @type {goog.TypedArray} */ var shaderExecutorOutput;
		/** @type {goog.TypedArray} */ var outputs; // deUint32

		// Special values to check.
		inputs.push([0.0, 0.0]);
		inputs.push([0.5, 1.0]);
		inputs.push([1.0, 0.5]);
		inputs.push([-0.5, 1.5]);
		inputs.push([0.25, 0.75]);

		// Random values.
		/** @type {number} */ var minExp = -14;
		/** @type {number} */ var maxExp = 15;

		/** @type {Array<number>} */ var v = [];
		for (var ndx = 0; ndx < 95; ndx++) {
			for (var c = 0; c < 2; c++) {
				/** @type {number} */ var s = rnd.getBool() ? 1 : -1;
				/** @type {number} */ var exp = rnd.getInt(minExp, maxExp);
				/** @type {number} */ var mantissa = rnd.getInt(0) & ((1 << 23) - 1);

				v[c] = (new tcuFloat.deFloat()).construct(s, exp ? exp : 1 /* avoid denormals */, (1 << 23) | mantissa).getValue();
			}
			inputs.push(v);
		}

		// Convert input values to fp16 and back to make sure they can be represented exactly in mediump.
		for (var inVal in inputs)
			inputs[inVal] = [tcuFloat.newFloat16(inputs[inVal][0]).getValue(), tcuFloat.newFloat16(inputs[inVal][1]).getValue()];

		bufferedLogToConsole('Executing shader for ' + inputs.length + ' input values');

		this.m_executor.useProgram();
		shaderExecutorOutput  = this.m_executor.execute(inputs.length, [tcuMatrixUtil.flatten(inputs)])[0];

		// Convert outputs if we get them as Uint8Array.
		// - VertexShaderExecutor.execute() returns either an array of Uint8Array
		// - FragmentShaderExecutor.execute() returns either an array of Uint8Array or Uint32Array
	    outputs = new Uint32Array(shaderExecutorOutput.buffer);

		// Verify
		/** @type {number} */ var numValues = inputs.length;
		/** @type {number} */ var maxPrints = 10;
		/** @type {number} */ var numFailed = 0;

		for (var valNdx = 0; valNdx < inputs.length; valNdx++) {
			/** @type {number} */ var ref0 = tcuFloat.newFloat16(inputs[valNdx][0]).bits();
			/** @type {number} */ var ref1 = tcuFloat.newFloat16(inputs[valNdx][1]).bits();
			/** @type {number} */ var ref = (ref1 << 16) | ref0;
			/** @type {number} */ var res = outputs[valNdx];
			/** @type {number} */ var res0 = (res & 0xffff);
			/** @type {number} */ var res1 = deMath.shiftRight(res, 16);
			/** @type {number} */ var diff0 = Math.abs(ref0 - res0);
			/** @type {number} */ var diff1 = Math.abs(ref1 - res1);

			if (diff0 > maxDiff || diff1 > maxDiff) {
				if (numFailed < maxPrints)
					bufferedLogToConsole('ERROR: Mismatch in value ' + valNdx +
									     ', expected packHalf2x16(' + inputs[valNdx] + ') = ' + ref /*tcu::toHex(ref)*/ +
									     ', got ' + res /*tcu::toHex(res)*/ +
									     '\n  diffs = (' + diff0 + ', ' + diff1 + '), max diff = ' + maxDiff);
				else if (numFailed == maxPrints)
					bufferedLogToConsole('...');

				numFailed += 1;
			}
		}

		bufferedLogToConsole((numValues - numFailed) + ' / ' + numValues + ' values passed');

		/** @type {boolean} */ var isOk = numFailed === 0;
		if (!isOk)
			testFailedOptions('Result comparison failed', false);
		else
			testPassedOptions('Pass', true);

		return tcuTestCase.IterateResult.STOP;

	};

	/**
	 * @constructor
	 * @extends {es3fShaderPackingFunctionTests.ShaderPackingFunctionCase}
	 * @param {gluShaderProgram.shaderType} shaderType
	 */
	es3fShaderPackingFunctionTests.UnpackHalf2x16Case = function(shaderType) {
		/** @const {string} */ var name = 'unpackhalf2x16' +
			es3fShaderPackingFunctionTests.getShaderTypePostfix(shaderType);
		es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.call(this, name, 'unpackHalf2x16', shaderType);

		this.m_spec.inputs.push(new glsShaderExecUtil.Symbol('in0', gluVarType.newTypeBasic(gluShaderUtil.DataType.UINT, gluShaderUtil.precision.PRECISION_HIGHP)));
		this.m_spec.outputs.push(new glsShaderExecUtil.Symbol('out0', gluVarType.newTypeBasic(gluShaderUtil.DataType.FLOAT_VEC2, gluShaderUtil.precision.PRECISION_MEDIUMP)));
		this.m_spec.source = 'out0 = unpackHalf2x16(in0);';
	};

	es3fShaderPackingFunctionTests.UnpackHalf2x16Case.prototype = Object.create(es3fShaderPackingFunctionTests.ShaderPackingFunctionCase.prototype);
	es3fShaderPackingFunctionTests.UnpackHalf2x16Case.prototype.constructor = es3fShaderPackingFunctionTests.UnpackHalf2x16Case;

	/**
	 * @return {tcuTestCase.IterateResult}
	 */
	es3fShaderPackingFunctionTests.UnpackHalf2x16Case.prototype.iterate = function() {
		/** @type {number} */ var maxDiff = 0; // All bits must be accurate.
		/** @type {deRandom.Random} */ var rnd = new deRandom.Random(deString.deStringHash(this.name) ^ 0x776002);
		/** @type {Array<number>} */ var inputs = [];
		/** @type {goog.TypedArray} */ var outputs; // vector<vec2<float>>
		/** @type {goog.TypedArray} */ var shaderExecutorOutput;

		// Special values.
		inputs.push((tcuFloat.newFloat16(0.0).bits() << 16) | tcuFloat.newFloat16(1.0).bits());
		inputs.push((tcuFloat.newFloat16(1.0).bits() << 16) | tcuFloat.newFloat16(0.0).bits());
		inputs.push((tcuFloat.newFloat16(-1.0).bits() << 16) | tcuFloat.newFloat16(0.5).bits());
		inputs.push((tcuFloat.newFloat16(0.5).bits() << 16) | tcuFloat.newFloat16(-0.5).bits());

		// Construct random values.
		/** @type {number} */ var minExp = -14;
		/** @type {number} */ var maxExp = 15;
		/** @type {number} */ var mantBits = 10;

		/** @type {number} */ var inVal = 0;
		for (var ndx = 0; ndx < 96; ndx++) {
			for (var c = 0; c < 2; c++) {
				/** @type {number} */ var s = rnd.getBool() ? 1 : -1;
				/** @type {number} */ var exp = rnd.getInt(minExp, maxExp);
				/** @type {number} */ var mantissa = rnd.getInt(0) & ((1 << mantBits) - 1);
				/** @type {number} */ var value = tcuFloat.newFloat16(0).construct(s, exp ? exp : 1 /* avoid denorm */, (1 << 10) | mantissa).bits();

				inVal |= value << (16 * c);
			}
			inputs.push(inVal);
		}

		bufferedLogToConsole('Executing shader for ' + inputs.length + ' input values');

		this.m_executor.useProgram();
		shaderExecutorOutput  = this.m_executor.execute(inputs.length, [inputs])[0];

		// Convert outputs if we get them as Uint8Array.
		// - VertexShaderExecutor.execute() returns either an array of Uint8Array
		// - FragmentShaderExecutor.execute() returns either an array of Uint8Array or Uint32Array
		outputs = new Float32Array(shaderExecutorOutput.buffer);

		// Verify
		/** @type {number} */ var numValues = inputs.length
		/** @type {number} */ var maxPrints = 10;
		/** @type {number} */ var numFailed = 0;

		for (var valNdx = 0; valNdx < inputs.length; valNdx++) {
			/** @type {number} */ var in0 = (inputs[valNdx] & 0xffff);
			/** @type {number} */ var in1 = deMath.shiftRight(inputs[valNdx], 16);
			/** @type {number} */ var ref0 = tcuFloat.halfFloatToNumber(in0);
			/** @type {number} */ var ref1 = tcuFloat.halfFloatToNumber(in1);
			/** @type {number} */ var res0 = outputs[2 * valNdx];
			/** @type {number} */ var res1 = outputs[2 * valNdx + 1];
			/** @type {number} */ var refBits0 = tcuFloat.newFloat32(ref0).bits();
			/** @type {number} */ var refBits1 = tcuFloat.newFloat32(ref1).bits();
			/** @type {number} */ var resBits0 = tcuFloat.newFloat32(res0).bits();
			/** @type {number} */ var resBits1 = tcuFloat.newFloat32(res1).bits();

			/** @type {number} */ var diff0 = Math.abs(refBits0 - resBits0);
			/** @type {number} */ var diff1 = Math.abs(refBits1 - resBits1);

			if (isNaN(ref0) && isNaN(res0))
			    diff0 = 0;
			if (isNaN(ref1) && isNaN(res1))
			    diff1 = 0;

			if (diff0 > maxDiff || diff1 > maxDiff) {
				if (numFailed < maxPrints)
					bufferedLogToConsole('ERROR: Mismatch in value ' + valNdx + ',\n' +
									 '  expected unpackHalf2x16(' + inputs[valNdx] /*tcu::toHex(inputs[valNdx])*/ + ') = ' +
									 'vec2(' + ref0 + ' / ' + refBits0 /*tcu::toHex(refBits0)*/ + ', ' + ref1 + ' / ' + refBits1 /*tcu::toHex(refBits1)*/ + ')' +
									 ', got vec2(' + res0 + ' / ' + resBits0 /*tcu::toHex(resBits0)*/ + ', ' + res1 + ' / ' + resBits1 /*tcu::toHex(resBits1)*/ + ')' +
									 '\n  ULP diffs = (' + diff0 + ', ' + diff1 + '), max diff = ' + maxDiff);
				else if (numFailed == maxPrints)
					bufferedLogToConsole('...');

				numFailed += 1;
			}
		}

		bufferedLogToConsole((numValues - numFailed) + ' / ' + numValues + ' values passed');

		/** @type {boolean} */ var isOk = numFailed === 0;
		if (!isOk)
			testFailedOptions('Result comparison failed', false);
		else
			testPassedOptions('Pass', true);

		return tcuTestCase.IterateResult.STOP;
	};

	/**
	 * @constructor
	 * @extends {tcuTestCase.DeqpTest}
	 */
	es3fShaderPackingFunctionTests.ShaderPackingFunctionTests = function() {
		tcuTestCase.DeqpTest.call(this, 'pack_unpack', 'Floating-point pack and unpack function tests');
	};

	es3fShaderPackingFunctionTests.ShaderPackingFunctionTests.prototype = Object.create(tcuTestCase.DeqpTest.prototype);
	es3fShaderPackingFunctionTests.ShaderPackingFunctionTests.prototype.constructor = es3fShaderPackingFunctionTests.ShaderPackingFunctionTests;

	es3fShaderPackingFunctionTests.ShaderPackingFunctionTests.prototype.init = function() {
		var testGroup = tcuTestCase.runner.testCases;
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackSnorm2x16Case(gluShaderProgram.shaderType.VERTEX, gluShaderUtil.precision.PRECISION_LOWP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackSnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT, gluShaderUtil.precision.PRECISION_LOWP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackSnorm2x16Case(gluShaderProgram.shaderType.VERTEX, gluShaderUtil.precision.PRECISION_MEDIUMP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackSnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT, gluShaderUtil.precision.PRECISION_MEDIUMP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackSnorm2x16Case(gluShaderProgram.shaderType.VERTEX, gluShaderUtil.precision.PRECISION_HIGHP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackSnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT, gluShaderUtil.precision.PRECISION_HIGHP));

		testGroup.addChild(new es3fShaderPackingFunctionTests.UnpackSnorm2x16Case(gluShaderProgram.shaderType.VERTEX));
		testGroup.addChild(new es3fShaderPackingFunctionTests.UnpackSnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT));

		testGroup.addChild(new es3fShaderPackingFunctionTests.PackUnorm2x16Case(gluShaderProgram.shaderType.VERTEX, gluShaderUtil.precision.PRECISION_LOWP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackUnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT, gluShaderUtil.precision.PRECISION_LOWP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackUnorm2x16Case(gluShaderProgram.shaderType.VERTEX, gluShaderUtil.precision.PRECISION_MEDIUMP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackUnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT, gluShaderUtil.precision.PRECISION_MEDIUMP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackUnorm2x16Case(gluShaderProgram.shaderType.VERTEX, gluShaderUtil.precision.PRECISION_HIGHP));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackUnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT, gluShaderUtil.precision.PRECISION_HIGHP));

		testGroup.addChild(new es3fShaderPackingFunctionTests.UnpackUnorm2x16Case(gluShaderProgram.shaderType.VERTEX));
		testGroup.addChild(new es3fShaderPackingFunctionTests.UnpackUnorm2x16Case(gluShaderProgram.shaderType.FRAGMENT));

		testGroup.addChild(new es3fShaderPackingFunctionTests.PackHalf2x16Case(gluShaderProgram.shaderType.VERTEX));
		testGroup.addChild(new es3fShaderPackingFunctionTests.PackHalf2x16Case(gluShaderProgram.shaderType.FRAGMENT));

		testGroup.addChild(new es3fShaderPackingFunctionTests.UnpackHalf2x16Case(gluShaderProgram.shaderType.VERTEX));
		testGroup.addChild(new es3fShaderPackingFunctionTests.UnpackHalf2x16Case(gluShaderProgram.shaderType.FRAGMENT));
	};

    /**
    * Run test
    * @param {WebGL2RenderingContext} context
    */
    es3fShaderPackingFunctionTests.run = function(context) {
    	gl = context;
    	//Set up Test Root parameters
    	var state = tcuTestCase.runner;
    	state.setRoot(new es3fShaderPackingFunctionTests.ShaderPackingFunctionTests());

    	//Set up name and description of this test series.
    	setCurrentTestName(state.testCases.fullName());
    	description(state.testCases.getDescription());

    	try {
    		//Run test cases
    		tcuTestCase.runTestCases();
    	}
    	catch (err) {
    		testFailedOptions('Failed to es3fShaderPackingFunctionTests.run tests', false);
    		tcuTestCase.runner.terminate();
    	}
    };

});