revert to vanilla assets

public/assets/minecraft/shaders/include/fog.glsl

@@ -0,0 +1,40 @@
+#version 330
+
+layout(std140) uniform Fog {
+    vec4 FogColor;
+    float FogEnvironmentalStart;
+    float FogEnvironmentalEnd;
+    float FogRenderDistanceStart;
+    float FogRenderDistanceEnd;
+    float FogSkyEnd;
+    float FogCloudsEnd;
+};
+
+float linear_fog_value(float vertexDistance, float fogStart, float fogEnd) {
+    if (vertexDistance <= fogStart) {
+        return 0.0;
+    } else if (vertexDistance >= fogEnd) {
+        return 1.0;
+    }
+
+    return (vertexDistance - fogStart) / (fogEnd - fogStart);
+}
+
+float total_fog_value(float sphericalVertexDistance, float cylindricalVertexDistance, float environmentalStart, float environmantalEnd, float renderDistanceStart, float renderDistanceEnd) {
+    return max(linear_fog_value(sphericalVertexDistance, environmentalStart, environmantalEnd), linear_fog_value(cylindricalVertexDistance, renderDistanceStart, renderDistanceEnd));
+}
+
+vec4 apply_fog(vec4 inColor, float sphericalVertexDistance, float cylindricalVertexDistance, float environmentalStart, float environmantalEnd, float renderDistanceStart, float renderDistanceEnd, vec4 fogColor) {
+    float fogValue = total_fog_value(sphericalVertexDistance, cylindricalVertexDistance, environmentalStart, environmantalEnd, renderDistanceStart, renderDistanceEnd);
+    return vec4(mix(inColor.rgb, fogColor.rgb, fogValue * fogColor.a), inColor.a);
+}
+
+float fog_spherical_distance(vec3 pos) {
+    return length(pos);
+}
+
+float fog_cylindrical_distance(vec3 pos) {
+    float distXZ = length(pos.xz);
+    float distY = abs(pos.y);
+    return max(distXZ, distY);
+}