Add support for vanilla enviromental fog

src/main/resources/assets/voxy/lang/en_us.json

@@ -19,6 +19,9 @@
   "voxy.config.general.renderDistance": "Render distance",
   "voxy.config.general.renderDistance.tooltip": "Render distance of voxy in chunks",
 
+  "voxy.config.general.environmental_fog": "Enable environmental fog",
+  "voxy.config.general.environmental_fog.tooltip": "Enables or disables voxy rendering environmental fog",
+
   "voxy.config.general.vanilla_fog": "Enable vanilla fog",
   "voxy.config.general.vanilla_fog.tooltip": "Enables or disables vanilla fog effect",
 

src/main/resources/assets/voxy/shaders/post/blit_texture_depth_cutout.frag

@@ -4,6 +4,10 @@ layout(binding = 0) uniform sampler2D colourTex;
 layout(binding = 1) uniform sampler2D depthTex;
 layout(location = 2) uniform mat4 invProjMat;
 layout(location = 3) uniform mat4 projMat;
+#ifdef USE_ENV_FOG
+layout(location = 4) uniform vec3 endParams;
+layout(location = 5) uniform vec3 fogColour;
+#endif
 
 out vec4 colour;
 in vec2 UV;
@@ -28,7 +32,16 @@ void main() {
         discard;
     }
 
-    depth = projDepth(rev3d(vec3(UV.xy, depth)));
+    vec3 point = rev3d(vec3(UV.xy, depth));
+
+    #ifdef USE_ENV_FOG
+    {
+        float fogLerp = max(fma(min(length(point.xyz), endParams.x),endParams.y,endParams.z),0);//512 is 32*16 which is the render distance in blocks
+        colour.rgb = mix(colour.rgb, fogColour, fogLerp);
+    }
+    #endif
+
+    depth = projDepth(point);
     depth = min(1.0f-(2.0f/((1<<24)-1)), depth);
     depth = depth * 0.5f + 0.5f;
     depth = gl_DepthRange.diff * depth + gl_DepthRange.near;