layout(triangles) in;

#ifdef POINT_LIGHT

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

layout(triangle_strip, max_vertices = 18) out;

uniform mat4 projectionMatrix;
uniform mat4 viewMatrices[6];

out vec4 FragPos;

// debug parameter
flat out int fcolor_idx;

void main(void){
    for (int layerId = 0; layerId < 6; ++layerId)
    {
        mat4 MVP = projectionMatrix * viewMatrices[layerId];
        gl_Layer = layerId;
        fcolor_idx = layerId;
        for (int i = 0; i < 3; ++i)
        {
            gl_Position = MVP * gl_in[i].gl_Position;
            EmitVertex();
        }
        EndPrimitive();
    }
}

#elif defined CASCADED

layout(triangle_strip, max_vertices = 9) out;

uniform mat4 frontShadowMVP;
uniform mat4 midShadowMVP;
uniform mat4 backShadowMVP;

// TODO

#endif