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#version 330
#if defined VERTEX_SHADER
layout (location = 0) in vec3 in_position;
layout (location = 1) in vec3 in_velocity;
out vec3 out_position;
out vec3 out_velocity;
uniform float timedelta;
uniform vec3 gravity_pos;
uniform float gravity_force;
void main() {
// direction towards the gravity point
vec3 dir = normalize(gravity_pos - in_position) * gravity_force;
float l = length(gravity_pos - in_position) / 10.0;
// Add gravity to velocity
vec3 vel = in_velocity - (dir / l * timedelta);
out_velocity = vel;
out_position = in_position - (vel * timedelta);
}
#endif
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