Attenuate the light ambient in lighting.glsl (Fixes #3597)

files/shaders/lighting.glsl

@@ -20,9 +20,7 @@ vec4 doLighting(vec3 viewPos, vec3 viewNormal, vec4 vertexColor)
         d = length(lightDir);
         lightDir = normalize(lightDir);
 
-        lightResult.xyz += ambient * gl_LightSource[i].ambient.xyz;
+        lightResult.xyz += (ambient * gl_LightSource[i].ambient.xyz + diffuse.xyz * gl_LightSource[i].diffuse.xyz * max(dot(viewNormal.xyz, lightDir), 0.0)) * clamp(1.0 / (gl_LightSource[i].constantAttenuation + gl_LightSource[i].linearAttenuation * d + gl_LightSource[i].quadraticAttenuation * d * d), 0.0, 1.0);
-        lightResult.xyz += diffuse.xyz * gl_LightSource[i].diffuse.xyz * clamp(1.0 / (gl_LightSource[i].constantAttenuation + gl_LightSource[i].linearAttenuation * d + gl_LightSource[i].quadraticAttenuation * d * d), 0.0, 1.0)
-                * max(dot(viewNormal.xyz, lightDir), 0.0);
     }
 
     lightResult.xyz += gl_LightModel.ambient.xyz * ambient;