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utils/cubelight/cubelight.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#include "tier0/platform.h"
+#include <stdio.h>
+#include "bitmap/float_bm.h"
+#include "mathlib/mathlib.h"
+#include "tier2/tier2.h"
+
+#define BRIGHT_THRESH 0.90      // pixels within this % of average are "bright"
+#define GROUND_IMPORTANCE 0.2   // weight for downward pointing skymap pixels
+
+float Importance(Vector const &direction)
+{
+	// this returns a scale factor which can be used to recurd the importance of certain
+	// directions.  in particular, this version makes the ground a lot less important than the sky
+	if (direction.z>.2)
+		return 1.0;
+	if (direction.z>0)
+		return FLerp(1.0,GROUND_IMPORTANCE,.2,0,direction.z);
+	else
+		return GROUND_IMPORTANCE;
+
+}
+
+void main(int argc,char **argv)
+{
+	InitCommandLineProgram(argc, argv);
+	if (argc!=2)
+	{
+		printf("format is %s basename\n",argv[0]);
+	}
+	else
+	{
+		FloatCubeMap_t cmap(argv[1]);
+		// find the brightest pixel. We will consider the pixels neat this to be the
+		// ones contrinbuting to the light source
+		float max_color=cmap.BrightestColor();
+		float threshhold=max_color*.90;
+		// now, find average color of non-bright pixels
+		float sumweights=0.0;
+		Vector AverageColor(0,0,0);
+		for(int f=0;f<6;f++)
+			for(int y=0;y<cmap.face_maps[f].Height;y++)
+				for(int x=0;x<cmap.face_maps[f].Width;x++)
+				{
+					Vector clr(
+						cmap.face_maps[f].Pixel(x,y,0),
+						cmap.face_maps[f].Pixel(x,y,1),
+						cmap.face_maps[f].Pixel(x,y,2));
+					float mag=clr.Length();
+					if (mag<threshhold)
+					{
+						float weight=Importance(cmap.PixelDirection(f,x,y));
+						sumweights+=weight;
+						AverageColor+=weight*clr;
+					}
+				}
+		AverageColor*=(1.0/sumweights);
+
+		Vector avg_light_dir(0,0,0);
+		Vector AverageHue(0,0,0);
+		// now, find average direction and color of bright pixels
+		for(int f=0;f<6;f++)
+			for(int y=0;y<cmap.face_maps[f].Height;y++)
+				for(int x=0;x<cmap.face_maps[f].Width;x++)
+				{
+					Vector clr(
+						cmap.face_maps[f].Pixel(x,y,0),
+						cmap.face_maps[f].Pixel(x,y,1),
+						cmap.face_maps[f].Pixel(x,y,2));
+					float mag=clr.Length();
+					if (mag>threshhold)
+					{
+						clr-=AverageColor;
+						AverageHue+=clr;
+						Vector pdir=cmap.PixelDirection(f,x,y);
+						pdir*=clr.Length();
+						avg_light_dir+=pdir;
+					}
+				}
+		VectorNormalize(AverageHue);
+		VectorNormalize(avg_light_dir);
+
+		printf("Point light dir=%f %f %f\n",avg_light_dir.x,avg_light_dir.y,avg_light_dir.z);
+//		printf("Point light color=%f %f %f\n",AverageHue.x,AverageHue.y,AverageHue.z);
+		printf("Point light color=%d %d %d 255\n",
+			( int )( 255 * pow( AverageHue.x, 1.0f / 2.2f ) ),
+			( int )( 255 * pow( AverageHue.y, 1.0f / 2.2f ) ),
+			( int )( 255 * pow( AverageHue.z, 1.0f / 2.2f ) ) );
+
+		// now, output ambient cube maps for image-based lighting. During this pass, we will also
+		// correct the ambient color
+
+		FloatCubeMap_t conv(32,32);
+
+		Vector AmbientColor(0,0,0);
+		float sumweights_amb=0;
+		
+		for(int f=0;f<6;f++)
+			for(int y=0;y<conv.face_maps[f].Height;y++)
+				for(int x=0;x<conv.face_maps[f].Width;x++)
+				{
+					Vector pdir=conv.PixelDirection(f,x,y);
+					float dot=pdir.Dot(avg_light_dir);
+					if (dot<0) dot=0;
+
+					float sumdot=0;
+					Vector sumlight(0,0,0);
+					for(int f1=0;f1<6;f1++)
+						for(int y1=0;y1<cmap.face_maps[f].Height;y1+=20)
+							for(int x1=0;x1<cmap.face_maps[f].Width;x1+=20)
+							{
+								Vector sdir=cmap.PixelDirection(f1,x1,y1);
+								float dot_sphere=sdir.Dot(pdir);
+								if (dot_sphere>0)
+								{
+									sumdot+=dot_sphere;
+									for(int comp=0;comp<3;comp++)
+										sumlight[comp]+=
+											dot_sphere*cmap.face_maps[f1].Pixel(x1,y1,comp);
+								}
+						}
+					sumlight*=1.0/sumdot;
+					// sumlight is the desired lighting
+
+					// use our calculated point light source to find the error
+					float weight=Importance(pdir);
+					sumweights_amb+=weight;
+					for(int comp=0;comp<3;comp++)
+					{
+						conv.face_maps[f].Pixel(x,y,comp)=sumlight[comp]; 
+						AmbientColor[comp]+=weight*(sumlight[comp]-dot*AverageHue[comp]);
+					}
+
+				}
+		AmbientColor*=1.0/sumweights_amb;
+		
+		conv.WritePFMs("ambient_cube_");
+		
+		
+//		printf("Ambient color=%f %f %f\n",AmbientColor.x,AmbientColor.y,AmbientColor.z);
+		// convert to gamma space. . .
+		printf("Ambient color=%d %d %d 255\n",
+			( int )( 255 * pow( AmbientColor.x, 1.0f/2.2f ) ),
+			( int )( 255 * pow( AmbientColor.y, 1.0f/2.2f ) ),
+			( int )( 255 * pow( AmbientColor.z, 1.0f/2.2f ) ) );
+
+		for(int f=0;f<6;f++)
+			for(int y=0;y<cmap.face_maps[f].Height;y++)
+				for(int x=0;x<cmap.face_maps[f].Width;x++)
+				{
+					Vector pdir=cmap.PixelDirection(f,x,y);
+					float dot=pdir.Dot(avg_light_dir);
+					if (dot<0) dot=0;
+					dot=pow(dot,7);
+					for(int comp=0;comp<3;comp++)
+						cmap.face_maps[f].Pixel(x,y,comp)=AmbientColor[comp]+dot*AverageHue[comp];
+				}
+		cmap.WritePFMs("directional_plus_ambient_");
+	}
+
+
+
+}
+

utils/cubelight/cubelight.vpc

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+//-----------------------------------------------------------------------------
+//	CUBELIGHT.VPC
+//
+//	Project Script
+//-----------------------------------------------------------------------------
+
+$Macro SRCDIR		"..\.."
+$Macro OUTBINDIR	"$SRCDIR\..\game\bin"
+
+$Include "$SRCDIR\vpc_scripts\source_exe_con_base.vpc"
+
+$Configuration
+{
+	$Compiler
+	{
+		$AdditionalIncludeDirectories		"$BASE,..\common"
+	}
+}
+
+$Project "Cubelight"
+{
+	$Folder "Source Files"
+	{
+		$File	"cubelight.cpp"
+	}
+	
+	$Folder	"Link Libraries"
+	{
+		$Lib bitmap
+		$Lib mathlib
+		$Lib tier2
+	}
+}