out vec4 FragColor;

uniform sampler2D uTexMain;
uniform vec3 uCamera;

in vec4 aColour;
in vec2 aUv;
in vec3 aNorm;
in vec3 aCo;
in vec3 aWorldCo;

#include "common_world.glsl"

void main()
{
   vec3 vfrag = texture( uTexMain, aUv ).rgb;

   // Lighting
   vec3 halfview = uCamera - aWorldCo;
   float fdist = length( halfview );
   halfview /= fdist;

   vfrag = do_light_diffuse( vfrag, aNorm );
   vfrag = do_light_spec( vfrag, aNorm, halfview, 0.1 );
   vfrag = do_light_shadowing( vfrag );
   vfrag = apply_fog( vfrag, fdist );

   float opacity = clamp( fdist, 0.1, 1.0 );

   FragColor = vec4(vfrag,opacity);
}