#version 120

#if @diffuseMap
varying vec2 diffuseMapUV;
#endif

#if @darkMap
varying vec2 darkMapUV;
#endif

#if @detailMap
varying vec2 detailMapUV;
#endif

#if @emissiveMap
varying vec2 emissiveMapUV;
#endif

varying float depth;

varying vec4 lighting;

#include "lighting.glsl"

void main(void)
{
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
    depth = gl_Position.z;

    vec4 viewPos = (gl_ModelViewMatrix * gl_Vertex);
    gl_ClipVertex = viewPos;
    vec3 viewNormal = normalize((gl_NormalMatrix * gl_Normal).xyz);

#if @diffuseMap
    diffuseMapUV = (gl_TextureMatrix[@diffuseMapUV] * gl_MultiTexCoord@diffuseMapUV).xy;
#endif

#if @darkMap
    darkMapUV = (gl_TextureMatrix[@darkMapUV] * gl_MultiTexCoord@darkMapUV).xy;
#endif

#if @detailMap
    detailMapUV = (gl_TextureMatrix[@detailMap] * gl_MultiTexCoord@detailMap).xy;
#endif

#if @emissiveMap
    emissiveMapUV = (gl_TextureMatrix[@emissiveMapUV] * gl_MultiTexCoord@emissiveMapUV).xy;
#endif

    lighting = doLighting(viewPos.xyz, viewNormal, gl_Color);

    // TODO: make clamp configurable
    // the following produces fixed-function compatible lighting, w/o clamp arguably looks better
    //lighting = clamp(lighting, vec4(0.0, 0.0, 0.0, 0.0), vec4(1.0, 1.0, 1.0, 1.0));
}