From 82c4c7053518e6e3358d3425ea7fb3ada208d246 Mon Sep 17 00:00:00 2001
From: Thilo Schulz <arny@ats.s.bawue.de>
Date: Sun, 30 Apr 2006 13:50:13 +0000
Subject: [PATCH] - Fix r_overBrightBits variable getting ignored on Linux -
 Replaced SDL_SetGamma by SDL_SetGammaRamp with gamma behaviour now matching
 win_gamma.c

---
 code/unix/sdl_glimp.c | 39 ++++++++++++++++++++++++++++++++-------
 1 file changed, 32 insertions(+), 7 deletions(-)

diff --git a/code/unix/sdl_glimp.c b/code/unix/sdl_glimp.c
index 0c6f8dcb..bd0f3308 100644
--- a/code/unix/sdl_glimp.c
+++ b/code/unix/sdl_glimp.c
@@ -438,15 +438,35 @@ void IN_DeactivateMouse( void )
 */
 void GLimp_SetGamma( unsigned char red[256], unsigned char green[256], unsigned char blue[256] )
 {
-  // NOTE TTimo we get the gamma value from cvar, because we can't work with the s_gammatable
-  //   the API wasn't changed to avoid breaking other OSes
-  float g;
+	Uint16 table[3][256];
+	int i, j;
+//	float g;
 
-  if ( r_ignorehwgamma->integer )
-    return;
+	if(r_ignorehwgamma->integer)
+		return;
 
-  g  = Cvar_Get("r_gamma", "1.0", 0)->value;
-  SDL_SetGamma(g, g, g);
+	// taken from win_gamma.c:
+	for (i = 0; i < 256; i++)
+	{
+		table[0][i] = ( ( ( Uint16 ) red[i] ) << 8 ) | red[i];
+		table[1][i] = ( ( ( Uint16 ) green[i] ) << 8 ) | green[i];
+		table[2][i] = ( ( ( Uint16 ) blue[i] ) << 8 ) | blue[i];
+	}
+
+	// enforce constantly increasing
+	for (j = 0; j < 3; j++)
+	{
+		for (i = 1; i < 256; i++)
+		{
+			if (table[j][i] < table[j][i-1])
+				table[j][i] = table[j][i-1];
+		}
+	}
+
+	SDL_SetGammaRamp(table[0], table[1], table[2]);
+
+//	g  = Cvar_Get("r_gamma", "1.0", 0)->value;
+//	SDL_SetGamma(g, g, g);
 }
 
 /*
@@ -553,7 +573,12 @@ static int GLW_SetMode( const char *drivername, int mode, qboolean fullscreen )
 
   Uint32 flags = SDL_OPENGL;
   if (fullscreen)
+  {
     flags |= SDL_FULLSCREEN;
+    glConfig.isFullscreen = qtrue;
+  }
+  else
+    glConfig.isFullscreen = qfalse;
 
   if (!r_colorbits->value)
     colorbits = 24;