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

shaders/final.fsh

@@ -67,6 +67,10 @@ 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
@@ -75,6 +79,7 @@ void main() {
     vec3 col = texture2D(colortex7,texcoord).rgb;
   #endif
 
+
   #ifdef CONTRAST_ADAPTATIVE_SHARPENING
     //Weights : 1 in the center, 0.5 middle, 0.25 corners
     vec3 albedoCurrent1 = texture2D(colortex7, texcoord + vec2(texelSize.x,texelSize.y)/MC_RENDER_QUALITY*0.5).rgb;
@@ -95,5 +100,8 @@ void main() {
   vec3 diff = col-lum;
   col = col + diff*(-lum*CROSSTALK + SATURATION);
   
+  
+	applyContrast(col, CONTRAST);
+  
 	gl_FragColor.rgb = clamp(int8Dither(col,texcoord),0.0,1.0);
 }