Restore flip shader and put the color correction in a dedicated shader

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14632 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/shaders/color_levels.frag

@@ -0,0 +1,26 @@
+uniform sampler2D tex;
+uniform vec3 inlevel;
+uniform vec2 outlevel;
+
+void main()
+{
+	vec2 texc = gl_TexCoord[0].xy;
+	texc.y = 1.0 - texc.y;
+
+
+	vec4 col = texture2D(tex, texc);
+
+	//col = col / (1 - col);
+
+	float inBlack = inlevel.x;
+	float inWhite = inlevel.z;
+	float inGamma = inlevel.y;
+
+	float outBlack = outlevel.x;
+	float outWhite = outlevel.y;
+
+	col.rgb = (pow(((col.rgb * 255.0) - inBlack) / (inWhite - inBlack),
+                vec3(1.0 / inGamma)) * (outWhite - outBlack) + outBlack) / 255.0;
+  
+	gl_FragColor = vec4(col.rgb, 1.0);
+}

data/shaders/flip.frag

@@ -5,23 +5,6 @@ void main()
 	vec2 texc = gl_TexCoord[0].xy;
 	texc.y = 1.0 - texc.y;
 
-
-	vec4 col = texture2D(tex, texc);
-
-	//col = col / (1 - col);
-	
-
-	float inBlack = 0.0;
-	float inWhite = 137.0;
-	float inGamma = 0.65;
-
-	
-	float outWhite = 255.0;
-	float outBlack = 0.0;
-
-	
-	col.rgb = (pow(((col.rgb * 255.0) - inBlack) / (inWhite - inBlack),
-                vec3(1.0 / inGamma)) * (outWhite - outBlack) + outBlack) / 255.0;
   
-	gl_FragColor = vec4(col.rgb, 1.0);
+	gl_FragColor = vec4(texture2D(tex, texc).rgb, 1.0);
 }