// inspired from
// http://learnopengl.com/#!Advanced-Lighting/Shadows/Point-Shadows

layout(triangles) in;
layout(triangle_strip, max_vertices = 18) out;

#ifdef POINT_LIGHT
uniform mat4 MVP[6];
#elif defined CASCADED
uniform mat4 frontShadowMVP;
uniform mat4 midShadowMVP;
uniform mat4 backShadowMVP;
#endif

out vec4 FragPos;

// debug parameter
flat out int fcolor_idx;

void main(void){
    for (int layerId = 0; layerId < 6; ++layerId){
        for (int i = 0; i < gl_in.length(); ++i){
            gl_Layer = layerId;
            fcolor_idx = layerId;
            FragPos = gl_in[i].gl_Position;
            gl_Position = MVP[layerId] * FragPos;
            EmitVertex();
        }
        EndPrimitive();
    }
}