From 5c97bccbf609eaa1928c9058d3d6b099397656a0 Mon Sep 17 00:00:00 2001
From: Rudolf Polzer <divverent@xonotic.org>
Date: Fri, 21 Oct 2011 17:19:52 +0200
Subject: [PATCH] experimental q3map2 command line option: -sRGB (store
 lightmaps in sRGB)

---
 tools/quake3/q3map2/game__null.h      |  1 +
 tools/quake3/q3map2/game_darkplaces.h |  1 +
 tools/quake3/q3map2/game_dq.h         |  1 +
 tools/quake3/q3map2/game_ef.h         |  1 +
 tools/quake3/q3map2/game_etut.h       |  3 ++-
 tools/quake3/q3map2/game_ja.h         |  1 +
 tools/quake3/q3map2/game_jk2.h        |  1 +
 tools/quake3/q3map2/game_nexuiz.h     |  1 +
 tools/quake3/q3map2/game_prophecy.h   |  1 +
 tools/quake3/q3map2/game_qfusion.h    |  1 +
 tools/quake3/q3map2/game_quake3.h     |  1 +
 tools/quake3/q3map2/game_quakelive.h  |  1 +
 tools/quake3/q3map2/game_reaction.h   |  1 +
 tools/quake3/q3map2/game_sof2.h       |  1 +
 tools/quake3/q3map2/game_tenebrae.h   |  1 +
 tools/quake3/q3map2/game_tremulous.h  |  1 +
 tools/quake3/q3map2/game_wolf.h       |  1 +
 tools/quake3/q3map2/game_wolfet.h     |  1 +
 tools/quake3/q3map2/game_xonotic.h    |  1 +
 tools/quake3/q3map2/light.c           | 13 +++++++++++++
 tools/quake3/q3map2/light_ydnar.c     |  9 +++++++++
 tools/quake3/q3map2/q3map2.h          |  2 ++
 22 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/tools/quake3/q3map2/game__null.h b/tools/quake3/q3map2/game__null.h
index c2f24849..0bc61e3a 100644
--- a/tools/quake3/q3map2/game__null.h
+++ b/tools/quake3/q3map2/game__null.h
@@ -63,6 +63,7 @@ game_t struct
 	qfalse,			/* wolf lighting model? */
 	0,			/* lightmap width/height */
 	0,			/* lightmap gamma */
+	qfalse,			/* lightmap sRGB */
 	0,			/* lightmap exposure */
 	0,			/* lightmap compensate */
 	0,			/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_darkplaces.h b/tools/quake3/q3map2/game_darkplaces.h
index e91fdb76..653beb10 100644
--- a/tools/quake3/q3map2/game_darkplaces.h
+++ b/tools/quake3/q3map2/game_darkplaces.h
@@ -54,6 +54,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	200.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	0.3f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_dq.h b/tools/quake3/q3map2/game_dq.h
index 97d2d6d5..3d6cfe49 100644
--- a/tools/quake3/q3map2/game_dq.h
+++ b/tools/quake3/q3map2/game_dq.h
@@ -54,6 +54,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.2f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	200.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	0.3f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_ef.h b/tools/quake3/q3map2/game_ef.h
index 84ea664c..4c08ab09 100644
--- a/tools/quake3/q3map2/game_ef.h
+++ b/tools/quake3/q3map2/game_ef.h
@@ -113,6 +113,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_etut.h b/tools/quake3/q3map2/game_etut.h
index 8add5bbe..ff791620 100644
--- a/tools/quake3/q3map2/game_etut.h
+++ b/tools/quake3/q3map2/game_etut.h
@@ -147,7 +147,8 @@ game_t struct
 	"flareshader",		/* default flare shader */
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
-	2.2f,				/* lightmap gamma */
+	1.0f,				/* lightmap gamma */
+	qtrue,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_ja.h b/tools/quake3/q3map2/game_ja.h
index 3d25129e..7f4a5fcc 100644
--- a/tools/quake3/q3map2/game_ja.h
+++ b/tools/quake3/q3map2/game_ja.h
@@ -67,6 +67,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_jk2.h b/tools/quake3/q3map2/game_jk2.h
index 056baf01..30bb3d3b 100644
--- a/tools/quake3/q3map2/game_jk2.h
+++ b/tools/quake3/q3map2/game_jk2.h
@@ -64,6 +64,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_nexuiz.h b/tools/quake3/q3map2/game_nexuiz.h
index 4d496c33..8e0785d9 100644
--- a/tools/quake3/q3map2/game_nexuiz.h
+++ b/tools/quake3/q3map2/game_nexuiz.h
@@ -63,6 +63,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_prophecy.h b/tools/quake3/q3map2/game_prophecy.h
index 60e299d3..a1a4c4b5 100644
--- a/tools/quake3/q3map2/game_prophecy.h
+++ b/tools/quake3/q3map2/game_prophecy.h
@@ -54,6 +54,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	200.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	0.4f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_qfusion.h b/tools/quake3/q3map2/game_qfusion.h
index 7645ad0a..0fd336c6 100644
--- a/tools/quake3/q3map2/game_qfusion.h
+++ b/tools/quake3/q3map2/game_qfusion.h
@@ -115,6 +115,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	512,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_quake3.h b/tools/quake3/q3map2/game_quake3.h
index 98d4c4b8..be09468d 100644
--- a/tools/quake3/q3map2/game_quake3.h
+++ b/tools/quake3/q3map2/game_quake3.h
@@ -112,6 +112,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_quakelive.h b/tools/quake3/q3map2/game_quakelive.h
index 1a509272..a9425a8f 100644
--- a/tools/quake3/q3map2/game_quakelive.h
+++ b/tools/quake3/q3map2/game_quakelive.h
@@ -64,6 +64,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_reaction.h b/tools/quake3/q3map2/game_reaction.h
index c81e7245..97b01c48 100644
--- a/tools/quake3/q3map2/game_reaction.h
+++ b/tools/quake3/q3map2/game_reaction.h
@@ -84,6 +84,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_sof2.h b/tools/quake3/q3map2/game_sof2.h
index 931ec69c..e7453f8d 100644
--- a/tools/quake3/q3map2/game_sof2.h
+++ b/tools/quake3/q3map2/game_sof2.h
@@ -139,6 +139,7 @@ game_t struct
 	qfalse,					/* wolf lighting model? */
 	128,					/* lightmap width/height */
 	1.0f,					/* lightmap gamma */
+	qfalse,					/* lightmap sRGB */
 	1.0f,					/* lightmap exposure */
 	1.0f,					/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_tenebrae.h b/tools/quake3/q3map2/game_tenebrae.h
index ab312158..2117aa45 100644
--- a/tools/quake3/q3map2/game_tenebrae.h
+++ b/tools/quake3/q3map2/game_tenebrae.h
@@ -112,6 +112,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	512,				/* lightmap width/height */
 	2.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_tremulous.h b/tools/quake3/q3map2/game_tremulous.h
index 5d422629..9a1cb796 100644
--- a/tools/quake3/q3map2/game_tremulous.h
+++ b/tools/quake3/q3map2/game_tremulous.h
@@ -70,6 +70,7 @@ game_t struct
 	qfalse,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_wolf.h b/tools/quake3/q3map2/game_wolf.h
index 157bfe3a..fc55c884 100644
--- a/tools/quake3/q3map2/game_wolf.h
+++ b/tools/quake3/q3map2/game_wolf.h
@@ -129,6 +129,7 @@ game_t struct
 	qtrue,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_wolfet.h b/tools/quake3/q3map2/game_wolfet.h
index 3495f0dc..fdda4d95 100644
--- a/tools/quake3/q3map2/game_wolfet.h
+++ b/tools/quake3/q3map2/game_wolfet.h
@@ -66,6 +66,7 @@ game_t struct
 	qtrue,				/* wolf lighting model? */
 	128,				/* lightmap width/height */
 	1.0f,				/* lightmap gamma */
+	qfalse,				/* lightmap sRGB */
 	1.0f,				/* lightmap exposure */
 	1.0f,				/* lightmap compensate */
 	1.0f,				/* lightgrid scale */
diff --git a/tools/quake3/q3map2/game_xonotic.h b/tools/quake3/q3map2/game_xonotic.h
index 568c263e..83d7715f 100644
--- a/tools/quake3/q3map2/game_xonotic.h
+++ b/tools/quake3/q3map2/game_xonotic.h
@@ -63,6 +63,7 @@ game_t struct
 	qfalse, /* wolf lighting model? */
 	128, /* lightmap width/height */
 	1.0f, /* lightmap gamma */
+	qfalse, /* lightmap sRGB */
 	1.0f, /* lightmap exposure */
 	1.0f, /* lightmap compensate */
 	1.0f, /* lightgrid scale */
diff --git a/tools/quake3/q3map2/light.c b/tools/quake3/q3map2/light.c
index 5d5dfc5e..25b5a87c 100644
--- a/tools/quake3/q3map2/light.c
+++ b/tools/quake3/q3map2/light.c
@@ -2065,6 +2065,12 @@ int LightMain( int argc, char **argv )
 	lightmapGamma = game->lightmapGamma;
 	Sys_Printf( " lightning gamma: %f\n", lightmapGamma );
 
+	lightmapsRGB = game->lightmapsRGB;
+	if(lightmapsRGB)
+		Sys_Printf( " lightmap colorspace: sRGB\n" );
+	else
+		Sys_Printf( " lightmap colorspace: linear\n" );
+
 	lightmapCompensate = game->lightmapCompensate;
 	Sys_Printf( " lightning compensation: %f\n", lightmapCompensate );
 
@@ -2204,6 +2210,13 @@ int LightMain( int argc, char **argv )
 			i++;
 		}
 		
+		else if( !strcmp( argv[ i ], "-sRGB" ) )
+		{
+			lightmapsRGB = qtrue;
+			Sys_Printf( "Lighting is in sRGB\n" );
+			i++;
+		}
+		
 		else if( !strcmp( argv[ i ], "-exposure" ) )
 		{
 			f = atof( argv[ i + 1 ] );
diff --git a/tools/quake3/q3map2/light_ydnar.c b/tools/quake3/q3map2/light_ydnar.c
index f291e7a5..09a8e484 100644
--- a/tools/quake3/q3map2/light_ydnar.c
+++ b/tools/quake3/q3map2/light_ydnar.c
@@ -44,6 +44,7 @@ ColorToBytes()
 ydnar: moved to here 2001-02-04
 */
 
+#define Image_sRGBFloatFromLinear(c) (((c) < 0.8014848f) ? (c) * 0.05046875f : 1.055f * (float)pow((c)*(1.0f/256.0f), 1.0f/2.4f) - 0.055f)
 void ColorToBytes( const float *color, byte *colorBytes, float scale )
 {
 	int		i;
@@ -120,6 +121,14 @@ void ColorToBytes( const float *color, byte *colorBytes, float scale )
 	
 	/* compensate for ingame overbrighting/bitshifting */
 	VectorScale( sample, (1.0f / lightmapCompensate), sample );
+
+	/* sRGB lightmaps */
+	if(lightmapsRGB)
+	{
+		sample[0] = floor(Image_sRGBFloatFromLinear(sample[0]) * 255.0 + 0.5);
+		sample[1] = floor(Image_sRGBFloatFromLinear(sample[1]) * 255.0 + 0.5);
+		sample[2] = floor(Image_sRGBFloatFromLinear(sample[2]) * 255.0 + 0.5);
+	}
 	
 	/* store it off */
 	colorBytes[ 0 ] = sample[ 0 ];
diff --git a/tools/quake3/q3map2/q3map2.h b/tools/quake3/q3map2/q3map2.h
index e86575e3..3d3509a4 100644
--- a/tools/quake3/q3map2/q3map2.h
+++ b/tools/quake3/q3map2/q3map2.h
@@ -565,6 +565,7 @@ typedef struct game_s
 	qboolean			wolfLight;						/* when true, lights work like wolf q3map  */
 	int					lightmapSize;					/* bsp lightmap width/height */
 	float				lightmapGamma;					/* default lightmap gamma */
+	qboolean			lightmapsRGB;					/* default lightmap sRGB mode */
 	float				lightmapExposure;				/* default lightmap exposure */
 	float				lightmapCompensate;				/* default lightmap compensate value */
 	float				gridScale;						/* vortex: default lightgrid scale (affects both directional and ambient spectres) */
@@ -2295,6 +2296,7 @@ Q_EXTERN qboolean			inGrid Q_ASSIGN(0);
 
 /* ydnar: lightmap gamma/compensation */
 Q_EXTERN float				lightmapGamma Q_ASSIGN( 1.0f );
+Q_EXTERN float				lightmapsRGB Q_ASSIGN( qfalse );
 Q_EXTERN float				lightmapExposure Q_ASSIGN( 1.0f );
 Q_EXTERN float				lightmapCompensate Q_ASSIGN( 1.0f );
 
-- 
2.39.2