#version 450
/* Scaled residual add: out = scale * a + b. In-place safe (out may alias a or
 * b). Used for the 0.2 residual scaling in RRDBNet blocks. */
layout(local_size_x = 256) in;

layout(std430, binding = 0) readonly  buffer A   { float a[]; };
layout(std430, binding = 1) readonly  buffer B   { float bb[]; };
layout(std430, binding = 2) writeonly buffer Out { float outp[]; };

layout(push_constant) uniform PC { uint n; float scale; } pc;

void main() {
    uint stride_g = gl_NumWorkGroups.x * 256u;
    for (uint i = gl_GlobalInvocationID.x; i < pc.n; i += stride_g) {
        outp[i] = pc.scale * a[i] + bb[i];
    }
}