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utils/vrad/radial.h

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+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef RADIAL_H
+#define RADIAL_H
+#pragma once
+
+#include "mathlib/bumpvects.h"
+#include "mathlib/ssemath.h"
+#include "lightmap.h"
+
+#define RADIALDIST2	2 // (1.25*1.25+1.25*1.25)
+#define RADIALDIST	1.42 // 1.77 // sqrt( RADIALDIST2 )
+
+#define WEIGHT_EPS	0.00001f
+
+//-----------------------------------------------------------------------------
+// The radial_t data structure is used to accumulate irregularly spaced and irregularly 
+// shaped direct and indirect lighting samples into a uniformly spaced and shaped luxel grid.
+// 
+// The name "radial" is more historical than discriptive; it stems from the filtering method, 
+// one of several methods initially tried.  Since all the other methods have since been deleted, 
+// it would probably be more accurate to rename it something like "LuxelAccumulationBucket" or 
+// something similar, but since "radial" is fairly meaningless it's not like it's actually confusing 
+// the issue.
+//-----------------------------------------------------------------------------
+typedef struct radial_s
+{
+	int	facenum;
+	lightinfo_t l;
+	int w, h;
+	float weight[SINGLEMAP];
+	LightingValue_t light[NUM_BUMP_VECTS + 1][SINGLEMAP];
+} radial_t;
+
+
+void WorldToLuxelSpace( lightinfo_t const *l, Vector const &world, Vector2D &coord );
+void LuxelSpaceToWorld( lightinfo_t const *l, float s, float t, Vector &world );
+
+void WorldToLuxelSpace( lightinfo_t const *l, FourVectors const &world, FourVectors &coord );
+void LuxelSpaceToWorld( lightinfo_t const *l, fltx4 s, fltx4 t, FourVectors &world );
+
+void AddDirectToRadial( radial_t *rad, 
+				  Vector const &pnt, 
+				  Vector2D const &coordmins, Vector2D const &coordmaxs, 
+				  Vector const light[NUM_BUMP_VECTS+1],
+				  bool hasBumpmap, bool neighborHasBumpmap );
+
+void AddBounceToRadial( radial_t *rad, 
+				  Vector const &pnt, 
+				  Vector2D const &coordmins, Vector2D const &coordmaxs, 
+				  Vector const light[NUM_BUMP_VECTS+1],
+				  bool hasBumpmap, bool neighborHasBumpmap );
+
+bool SampleRadial( radial_t *rad, Vector& pnt, Vector light[NUM_BUMP_VECTS+1], int bumpSampleCount );
+
+radial_t *AllocateRadial( int facenum );
+void FreeRadial( radial_t *rad );
+
+bool SampleRadial( radial_t *rad, Vector& pnt, Vector light[NUM_BUMP_VECTS + 1], int bumpSampleCount );
+radial_t *BuildPatchRadial( int facenum );
+
+// utilities
+bool FloatLess( float const& src1, float const& src2 );
+
+#endif