#version 450

struct Particle {
  vec2 position;
  vec2 velocity;
  vec4 color;
};

layout (binding = 0) uniform ParameterUBO {
    float deltaTime;
} ubo;


layout(std140, binding = 2) readonly buffer ParticleSSBOIn {
   Particle particlesIn[ ];
};

layout(std140, binding = 3) buffer ParticleSSBOOut {
   Particle particlesOut[ ];
};

layout (local_size_x = 256, local_size_y = 1, local_size_z = 1) in;

void main()
{
    uint index = gl_GlobalInvocationID.x;

    Particle particleIn = particlesIn[index];

    particlesOut[index].position = particleIn.position + particleIn.velocity.xy * ubo.deltaTime;
    particlesOut[index].velocity = particleIn.velocity;
}