Initial commit of Command & Conquer Renegade source code.

Code/WWMath/lookuptable.h

@@ -0,0 +1,161 @@
+/*
+**	Command & Conquer Renegade(tm)
+**	Copyright 2025 Electronic Arts Inc.
+**
+**	This program is free software: you can redistribute it and/or modify
+**	it under the terms of the GNU General Public License as published by
+**	the Free Software Foundation, either version 3 of the License, or
+**	(at your option) any later version.
+**
+**	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/>.
+*/
+
+/***********************************************************************************************
+ ***              C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S               ***
+ ***********************************************************************************************
+ *                                                                                             *
+ *                 Project Name : WWPhys                                                       *
+ *                                                                                             *
+ *                     $Archive:: /Commando/Code/wwmath/lookuptable.h                         $*
+ *                                                                                             *
+ *              Original Author:: Greg Hjelstrom                                               *
+ *                                                                                             *
+ *                      $Author:: Greg_h                                                      $*
+ *                                                                                             *
+ *                     $Modtime:: 4/18/00 1:20p                                               $*
+ *                                                                                             *
+ *                    $Revision:: 6                                                           $*
+ *                                                                                             *
+ *---------------------------------------------------------------------------------------------*
+ * Functions:                                                                                  *
+ * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+
+
+#ifndef LOOKUPTABLE_H
+#define LOOKUPTABLE_H
+
+#include "always.h"
+#include "simplevec.h"
+#include "wwstring.h"
+#include "refcount.h"
+#include "multilist.h"
+#include "wwmath.h"
+
+
+class Vector2;
+class Curve1DClass;
+class ChunkSaveClass;
+class ChunkLoadClass;
+
+
+/**
+** LookupTableClass
+** This class contains the tabulated values for a function. 
+*/
+class LookupTableClass : public RefCountClass, public MultiListObjectClass
+{
+public:
+
+	LookupTableClass(int sample_count = 256);
+	virtual ~LookupTableClass(void);
+
+	void								Init(const char * name,Curve1DClass * curve);
+	float								Get_Value(float input);
+	float								Get_Value_Quick(float input);
+	const char *					Get_Name(void)							{ return Name; }
+protected:
+
+	StringClass						Name;				// name of this table, if it came from a file, this is also the filename
+	float								MinInputValue; 
+	float								MaxInputValue;
+	float								OOMaxMinusMin;
+	SimpleVecClass<float>		OutputSamples;
+
+};
+
+inline float LookupTableClass::Get_Value(float input)
+{
+	if (input <= MinInputValue) {
+		return OutputSamples[0];
+	}
+	if (input >= MaxInputValue) {
+		return OutputSamples[OutputSamples.Length()-1];
+	}
+	
+	float normalized_input = (float)(OutputSamples.Length()-1) * (input - MinInputValue) * OOMaxMinusMin;
+	float input0 = WWMath::Floor(normalized_input);
+	
+	int index0 = WWMath::Float_To_Long(input0);
+	int index1 = index0+1;
+	float lerp = normalized_input - input0;
+
+	return OutputSamples[index0] + lerp * (OutputSamples[index1] - OutputSamples[index0]);
+}
+
+inline float LookupTableClass::Get_Value_Quick(float input)
+{
+	if (input <= MinInputValue) {
+		return OutputSamples[0];
+	}
+	if (input >= MaxInputValue) {
+		return OutputSamples[OutputSamples.Length()-1];
+	}
+	
+	int index = (OutputSamples.Length()-1) * WWMath::Float_To_Long((input - MinInputValue) * OOMaxMinusMin);
+	return OutputSamples[index];
+}
+
+
+/**
+** LookupTableMgrClass
+** This class tracks all of the LookupTableClass's that have been loaded or installed.
+** LookupTables can be created using the "SimpleGraph" tool.  It basically allows you 
+** to edit a curve which will be used to generate the table.  These curves are stored
+** in .TBL files.
+**
+** NOTE: Use the SimpleGraph program to create lookup tables!  Then just ask for them
+** by filename and it will load the table for you (unless it is already loaded).
+**
+** NOTE: I add a table called "DefaultTable" so that you can revert to that if
+** your table isn't found.  
+*/
+class LookupTableMgrClass
+{
+public:
+	LookupTableMgrClass(void);
+	~LookupTableMgrClass(void);
+
+	// init and shutdown are automatically called from WWMath::Init, WWMath::Shutdown...
+	static void					Init(void);
+	static void					Shutdown(void);
+
+	static bool					Add_Table(LookupTableClass * table);
+	static bool					Remove_Table(LookupTableClass * table);
+	static LookupTableClass *	Get_Table(const char * name,bool try_to_load = true);
+	
+	static void					Save_Table_Desc(		ChunkSaveClass &	csave,
+																Curve1DClass *		curve,
+																const Vector2 &	min,
+																const Vector2 &	max			);
+	
+	static void					Load_Table_Desc(		ChunkLoadClass &	cload,
+																Curve1DClass **	curve_ptr,
+																Vector2 *			set_min = NULL,
+																Vector2 *			set_max = NULL	);
+
+	static void					Reset(void);
+
+protected:
+
+	static RefMultiListClass<LookupTableClass>	Tables;
+
+};
+
+
+#endif // LOOKUPTABLE_H