From 3bf9df6b2785fa6d951086978a3e66f49427166a Mon Sep 17 00:00:00 2001
From: FluorescentCIAAfricanAmerican <0934gj3049fk@protonmail.com>
Date: Wed, 22 Apr 2020 12:56:21 -0400
Subject: 1

---
 utils/normal2ssbump/normal2ssbump.cpp | 74 +++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 utils/normal2ssbump/normal2ssbump.cpp

(limited to 'utils/normal2ssbump/normal2ssbump.cpp')

diff --git a/utils/normal2ssbump/normal2ssbump.cpp b/utils/normal2ssbump/normal2ssbump.cpp
new file mode 100644
index 0000000..3e28856
--- /dev/null
+++ b/utils/normal2ssbump/normal2ssbump.cpp
@@ -0,0 +1,74 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#include "tier0/platform.h"
+#include "tier0/progressbar.h"
+#include "bitmap/float_bm.h"
+#include "mathlib/mathlib.h"
+#include "tier1/strtools.h"
+#include "tier2/tier2.h"
+#include "tier0/memdbgon.h"
+
+static float RangeAdjust( float x )
+{
+	return (2*(x-.5));
+}
+
+static float saturate_and_square( float x )
+{
+	x=max(0.f,min(1.f, x) );
+	return x * x;
+}
+
+#define OO_SQRT_3 0.57735025882720947f
+static Vector bumpBasis[3] = {
+	Vector( 0.81649661064147949f, 0.0f, OO_SQRT_3 ),
+	Vector(  -0.40824833512306213f, 0.70710676908493042f, OO_SQRT_3 ),
+	Vector(  -0.40824821591377258f, -0.7071068286895752f, OO_SQRT_3 )
+};
+
+void main(int argc,char **argv)
+{
+	InitCommandLineProgram( argc, argv );
+	if (argc != 2)
+	{
+		printf("format is 'normal2ssbump filename.tga\n");
+	}
+	else
+	{
+		ReportProgress( "reading src texture",0,0 );
+		FloatBitMap_t src_texture(argv[1]);
+		for(int y=0;y<src_texture.Height;y++)
+		{
+			ReportProgress( "Converting to ssbump format",src_texture.Height,y );
+			for(int x=0;x<src_texture.Width;x++)
+			{
+				Vector n( RangeAdjust( src_texture.Pixel( x,y,0 ) ),
+						  RangeAdjust( src_texture.Pixel( x,y,1 ) ),
+						  RangeAdjust( src_texture.Pixel( x,y,2 ) ) );
+				Vector dp( saturate_and_square( DotProduct( n, bumpBasis[0] ) ),
+						   saturate_and_square( DotProduct( n, bumpBasis[1] ) ),
+						   saturate_and_square( DotProduct( n, bumpBasis[2] ) ) );
+				float sum = DotProduct(dp, Vector(1,1,1));
+				dp *= 1.0/sum;
+				src_texture.Pixel(x,y,0) = dp.x;
+				src_texture.Pixel(x,y,1) = dp.y;
+				src_texture.Pixel(x,y,2) = dp.z;
+			}
+		}
+		char oname[1024];
+		strcpy(oname,argv[1]);
+		char *dot=Q_stristr(oname,"_normal");
+		if (! dot)
+			dot=strchr(oname,'.');
+		if (! dot)
+			dot=oname+strlen(oname);
+		strcpy(dot,"_ssbump.tga");
+		printf( "\nWriting %s\n",oname );
+		src_texture.WriteTGAFile( oname );
+	}
+
+}
-- 
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