// depth_vertex_shader.vs
#version 330 core

// Vertex Attributes
layout(location = 0) in vec3 aPos;

// Uniform Matrices
uniform mat4 model;
uniform mat4 lightSpaceMatrix;

// Output to Fragment Shader
out vec4 FragPosLightSpace;

void main()
{
    // Calculate fragment position in world space
    vec3 FragPos = vec3(model * vec4(aPos, 1.0));
    
    // Calculate fragment position in light space
    FragPosLightSpace = lightSpaceMatrix * vec4(FragPos, 1.0);
    
    // Final vertex position in clip space
    gl_Position = FragPosLightSpace;
}