Pass through Geometry shader

pass-through.glsl

layout (triangles) in;
layout (triangle_strip, max_vertices = 4) out;

/**
* Simple pass-through Geometry Shader
* Assumes vertices are passed in as GL_TRIANGLES
* Change accordingly. If things doesn't work, make sure max_vertices is set to at least the number of vertices you're spitting out
*/ 
void main() {
    
    for(int i = 0; i < gl_in.length(); i++)
    {
        gl_Position = gl_in[i].gl_Position;
        EmitVertex();
    }
    EndPrimitive();
}