/**

 * vim: set ts=4 :

 * ================================================================

 * SourceMod

 * Copyright (C) 2004-2007 AlliedModders LLC.  All rights reserved.

 * ================================================================

 *

 * This program is free software; you can redistribute it and/or 

 * modify it under the terms of the GNU General Public License, 

 * version 3.0, as published by the Free Software Foundation.

 * 

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to 

 * link the code of this program (as well as its derivative works) to 

 * "Half-Life 2," the "Source Engine," the "SourcePawn JIT," and any 

 * Game MODs that run on software by the Valve Corporation.  You must 

 * obey the GNU General Public License in all respects for all other 

 * code used. Additionally, AlliedModders LLC grants this exception 

 * to all derivative works. AlliedModders LLC defines further 

 * exceptions, found in LICENSE.txt (as of this writing, version 

 * JULY-31-2007), or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#include <math.h>

#include <string.h>

#include <stdlib.h>

#include "sm_globals.h"

/****************************************

*                                       *

* FLOATING POINT NATIVE IMPLEMENTATIONS *

*                                       *

****************************************/

static cell_t sm_float(IPluginContext *pCtx, const cell_t *params)

{

	float val = static_cast<float>(params[1]);

	return sp_ftoc(val);

}

static cell_t sm_FloatAbs(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = (val >= 0.0f) ? val : -val;

	return sp_ftoc(val);

}

static cell_t sm_FloatAdd(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) + sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatSub(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) - sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatMul(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) * sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatDiv(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) / sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatCompare(IPluginContext *pCtx, const cell_t *params)

{

	float val1 = sp_ctof(params[1]);

	float val2 = sp_ctof(params[2]);

	if (val1 > val2)

	{

		return 1;

	} else if (val1 < val2) {

		return -1;

	}

	return 0;

}

static cell_t sm_Logarithm(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	float base = sp_ctof(params[2]);

	if ((val <= 0.0f) || (base <= 0.0f))

	{

		return pCtx->ThrowNativeError("Cannot evaluate the logarithm of zero or a negative number (val:%f base:%f)", val, base);

	}

	if (base == 10.0f)

	{

		val = log10(val);

	} else {

		val = log(val) / log(base);

	}

	return sp_ftoc(val);

}

static cell_t sm_Exponential(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	return sp_ftoc(exp(val));

}

static cell_t sm_Pow(IPluginContext *pCtx, const cell_t *params)

{

	float base = sp_ctof(params[1]);

	float exponent = sp_ctof(params[2]);

	return sp_ftoc(pow(base, exponent));

}

static cell_t sm_SquareRoot(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	if (val < 0.0f)

	{

		return pCtx->ThrowNativeError("Cannot evaluate the square root of a negative number (val:%f)", val);

	}

	return sp_ftoc(sqrt(val));

}

static cell_t sm_RoundToNearest(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = (float)floor(val + 0.5f);

	return static_cast<int>(val);

}

static cell_t sm_RoundToFloor(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = floor(val);

	return static_cast<int>(val);

}

static cell_t sm_RoundToCeil(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = ceil(val);

	return static_cast<int>(val);

}

static cell_t sm_RoundToZero(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	if (val >= 0.0f)

	{

		val = floor(val);

	} else {

		val = ceil(val);

	}

	return static_cast<int>(val);

}

static cell_t sm_FloatFraction(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = val - floor(val);

	return sp_ftoc(val);

}

static cell_t sm_Sine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = sin(val);

	return sp_ftoc(val);

}

static cell_t sm_Cosine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = cos(val);

	return sp_ftoc(val);

}

static cell_t sm_Tangent(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = tan(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcSine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = asin(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcCosine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = acos(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcTangent(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = atan(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcTangent2(IPluginContext *pCtx, const cell_t *params)

{

	float val1 = sp_ctof(params[1]);

	float val2 = sp_ctof(params[2]);

	val1 = atan2(val1, val2);

	return sp_ftoc(val1);

}

static cell_t sm_FloatRound(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	switch (params[2])

	{

	case 1:

		{

			val = floor(val);

			break;

		}

	case 2:

		{

			val = ceil(val);

			break;

		}

	case 3:

		{

			if (val >= 0.0f)

			{

				val = floor(val);

			} else {

				val = ceil(val);

			}

			break;

		}

	default:

		{

			val = (float)floor(val + 0.5f);

			break;

		}

	}

	return static_cast<int>(val);

}

REGISTER_NATIVES(floatnatives)

{

	{"float",			sm_float},

	{"FloatMul",		sm_FloatMul},

	{"FloatDiv",		sm_FloatDiv},

	{"FloatAdd",		sm_FloatAdd},

	{"FloatSub",		sm_FloatSub},

	{"FloatFraction",	sm_FloatFraction},

	{"RoundToZero",		sm_RoundToZero},

	{"RoundToCeil",		sm_RoundToCeil},

	{"RoundToFloor",	sm_RoundToFloor},

	{"RoundToNearest",	sm_RoundToNearest},

	{"FloatCompare",	sm_FloatCompare},

	{"SquareRoot",		sm_SquareRoot},

	{"Pow",				sm_Pow},

	{"Exponential",		sm_Exponential},

	{"Logarithm",		sm_Logarithm},

	{"Sine",			sm_Sine},

	{"Cosine",			sm_Cosine},

	{"Tangent",			sm_Tangent},

	{"FloatAbs",		sm_FloatAbs},

	{"ArcTangent",		sm_ArcTangent},

	{"ArcCosine",		sm_ArcCosine},

	{"ArcSine",			sm_ArcSine},

	{"ArcTangent2",		sm_ArcTangent2},

	{"FloatRound",		sm_FloatRound},			/* Backwards compat shim */

	{NULL,				NULL}

};