#version 450

#extension GL_EXT_shader_16bit_storage : require
#extension GL_EXT_control_flow_attributes : enable

layout (push_constant) uniform parameter
{
    uint ncols;
    uint rows_per_channel;
    uint n_past;
} p;

#include "types.comp"

layout(local_size_x = 512, local_size_y = 1, local_size_z = 1) in;

layout (binding = 0) readonly buffer X {A_TYPE data_a[];};
layout (binding = 1) writeonly buffer D {D_TYPE data_d[];};

void main() {
    const uint col = gl_GlobalInvocationID.y;
    const uint row = gl_GlobalInvocationID.x;

    if (col >= p.ncols) {
        return;
    }

    const uint i = row*p.ncols + col;
    if (col > p.n_past + row % p.rows_per_channel) {
        data_d[i] = D_TYPE(uintBitsToFloat(0xFF800000));
    } else {
        data_d[i] = D_TYPE(data_a[i]);
    }
}