#version 450
// Ternary select: cond != 0 ? a : b. Operands broadcast by trailing modulus.
layout(local_size_x = 256) in;
layout(std430, binding = 0) buffer Arena { float data[]; };
layout(push_constant) uniform PC {
uint n;
uint cond_off;
uint a_off;
uint b_off;
uint out_off;
uint cond_mod;
uint a_mod;
uint b_mod;
} pc;
void main() {
uint i = gl_GlobalInvocationID.x;
if (i >= pc.n) { return; }
uint ci = (pc.cond_mod == 0u) ? i : (i % pc.cond_mod);
uint ai = (pc.a_mod == 0u) ? i : (i % pc.a_mod);
uint bi = (pc.b_mod == 0u) ? i : (i % pc.b_mod);
float c = data[pc.cond_off + ci];
data[pc.out_off + i] = (c != 0.0) ? data[pc.a_off + ai] : data[pc.b_off + bi];
}