Fog

shaders/chunks/raymarcher.glsl

@@ -8,6 +8,7 @@ layout( location = 4 ) uniform vec3 u_CamUp;
 layout( location = 5 ) uniform float u_NearPlane;
 layout( location = 6 ) uniform vec3 u_LightDir;
 layout( location = 7 ) uniform vec4 u_Render;
+layout( location = 8 ) uniform float u_FogAttenuation;
 
 layout( location = 0 ) out vec3 o_Color;
 layout( location = 1 ) out float o_Z;

shaders/lib/fog.glsl

@@ -0,0 +1,10 @@
+//! type library
+
+vec3 FOG_Apply(
+	in vec3 color ,
+	in float dist ,
+	in float attenuation ,
+	in vec3 background )
+{
+	return mix( background , color , exp( - dist * dist * attenuation ) );
+}

shaders/scene.f.glsl

@@ -4,6 +4,7 @@
 //! include chunks/raymarcher.glsl
 //! include lib/shading-pbr.glsl
 //! include lib/shading-blinnphong.glsl
+//! include lib/fog.glsl
 
 
 T_BPMaterial BPMaterials[1] = {
@@ -64,8 +65,9 @@ void main( )
 			int( u_Render.x ) , u_Render.y ,
 			u_Render.z , .001 , u_Render.w );
 	vec3 hitPos = u_CamPos + rayDir * r.x;
+	const vec3 background = vec3( .01 );
 
-	vec3 bc = vec3( 0 );
+	vec3 bc = background;
 	if ( r.y >= 0. ) {
 		const int midx = int( r.y );
 		const vec3 normal = RM_GetNormal( hitPos );
@@ -85,6 +87,7 @@ void main( )
 		if ( glowidx >= 0 ) {
 			bc += Glow[ glowidx ];
 		}
+		bc = FOG_Apply( bc , r.x , u_FogAttenuation , background );
 	}
 
 	o_Color = bc;