added a contrast setting. make beacon beams and enchantment glint work in the end and nether. tweak lighting in the end and nether.

shaders/world1/final.fsh

@@ -19,6 +19,11 @@ uniform int isEyeInWater;
 #include "/lib/color_dither.glsl"
 #include "/lib/res_params.glsl"
 
+/// thanks stackoverflow https://stackoverflow.com/questions/944713/help-with-pixel-shader-effect-for-brightness-and-contrast#3027595
+void applyContrast(inout vec3 color, float contrast){
+  color = (color - 0.5) * contrast + 0.5;
+}
+
 vec4 SampleTextureCatmullRom(sampler2D tex, vec2 uv, vec2 texSize )
 {
     // We're going to sample a a 4x4 grid of texels surrounding the target UV coordinate. We'll do this by rounding
@@ -69,6 +74,11 @@ vec4 SampleTextureCatmullRom(sampler2D tex, vec2 uv, vec2 texSize )
     return result;
 }
 
+/// thanks stackoverflow https://stackoverflow.com/questions/944713/help-with-pixel-shader-effect-for-brightness-and-contrast#3027595
+void applyContrast(inout vec3 color, float contrast){
+  color = (color - 0.5) * contrast + 0.5;
+}
+
 void main() {
   #ifdef BICUBIC_UPSCALING
     vec3 col = SampleTextureCatmullRom(colortex7,texcoord,1.0/texelSize).rgb;
@@ -96,6 +106,9 @@ void main() {
   vec3 diff = col-lum;
   col = col + diff*(-lum*CROSSTALK + SATURATION);
   //col = -vec3(-lum*CROSSFADING + SATURATION);
+
+	applyContrast(col, CONTRAST);
+
 	gl_FragColor.rgb = clamp(int8Dither(col,texcoord),0.0,1.0);
   //gl_FragColor.rgb = vec3(contrast);
 }