layout(location = 0) in vec2 uv;

in VS_OUT {
    vec2 uv;
    vec3 fragpos;
} vs_in;

layout(binding = 0) uniform UniformBufferObject {
    mat4 projection, view, model;
    vec4 lightPosition;
    float farPlane;
} ubo;

layout(binding = 1) uniform sampler2D texSampler;

void main() {
    if(textureSize(texSampler, 0).x > 0) {
        if(texture(texSampler, vs_in.uv).a < 0.1) {
            discard;
        }
    }

    if(ubo.lightPosition.w == 1.0f) {
        float lightDistance = length(vs_in.fragpos.xyz - ubo.lightPosition.xyz);
        lightDistance = lightDistance / ubo.farPlane;

        gl_FragDepth = lightDistance;
    } else {
        gl_FragDepth = gl_FragCoord.z;
    }
}