#version 450

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


layout(std140, binding = 1) readonly buffer TexelSSBOIn {
   vec4 texelsIn[];
};

layout(std140, binding = 2) buffer TexelSSBOOut {
   vec4 texelsOut[];
};

layout (local_size_x = 8, local_size_y = 1, local_size_z = 1) in;

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

    vec4 texelIn = texelsIn[idx];

    float gray = dot(texelIn.rgb, vec3(0.2627, 0.6780, 0.0593));
    texelsOut[idx] = vec4(vec3(gray), 1.0);
}