// Data the host uploads for the GPU wand / projectile system: cast requests, shot nodes and specs (also appended to by the GPU).
layout(std430, set = 0, binding = 35) buffer FxHost {                                 // written by the host: cast requests, shot nodes and specs
    ivec4 hhead;           // x, y: number of requests in list 0 / 1
    vec4 hcast[1024];      // 2 lists x 256 requests x 2 vec4: (x, y, dir x, dir y), (node or -boom-1, team, seed, flags)
    vec4 hnodes[8192];     // 2048 nodes x 4 vec4
    ivec4 hspecs[16384];   // 4096 specs x 4 ivec4
    ivec4 hcollision;     // x: compact collision target count, rebuilt on the GPU before flight
    int htargets[4096];   // ascending entity slots; preserves first-hit ordering
};