#version 450

#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shading_language_420pack : enable

struct Particle
{
	vec4 pos;
	vec4 vel;
};

// Binding 0 : Position storage buffer
layout(std140, binding = 0) buffer Pos 
{
   Particle particles[ ];
};

layout (local_size_x = 256) in;

layout (binding = 1) uniform UBO 
{
	float deltaT;
	float destX;
	float destY;
	int particleCount;
} ubo;

void main() 
{
	int index = int(gl_GlobalInvocationID);
	vec4 position = particles[index].pos;
	vec4 velocity = particles[index].vel;
	position += ubo.deltaT * velocity;
	particles[index].pos = position;
}