// Code auto-generated by piet-gpu-derive

struct FillTileHeaderRef {
    uint offset;
};

struct FillItemHeaderRef {
    uint offset;
};

struct FillSegmentRef {
    uint offset;
};

struct FillSegChunkRef {
    uint offset;
};

struct FillTileHeader {
    uint n;
    FillItemHeaderRef items;
};

#define FillTileHeader_size 8

FillTileHeaderRef FillTileHeader_index(FillTileHeaderRef ref, uint index) {
    return FillTileHeaderRef(ref.offset + index * FillTileHeader_size);
}

struct FillItemHeader {
    int backdrop;
    FillSegChunkRef segments;
};

#define FillItemHeader_size 8

FillItemHeaderRef FillItemHeader_index(FillItemHeaderRef ref, uint index) {
    return FillItemHeaderRef(ref.offset + index * FillItemHeader_size);
}

struct FillSegment {
    vec2 start;
    vec2 end;
};

#define FillSegment_size 16

FillSegmentRef FillSegment_index(FillSegmentRef ref, uint index) {
    return FillSegmentRef(ref.offset + index * FillSegment_size);
}

struct FillSegChunk {
    uint n;
    FillSegChunkRef next;
};

#define FillSegChunk_size 8

FillSegChunkRef FillSegChunk_index(FillSegChunkRef ref, uint index) {
    return FillSegChunkRef(ref.offset + index * FillSegChunk_size);
}

FillTileHeader FillTileHeader_read(FillTileHeaderRef ref) {
    uint ix = ref.offset >> 2;
    uint raw0 = fill_seg[ix + 0];
    uint raw1 = fill_seg[ix + 1];
    FillTileHeader s;
    s.n = raw0;
    s.items = FillItemHeaderRef(raw1);
    return s;
}

void FillTileHeader_write(FillTileHeaderRef ref, FillTileHeader s) {
    uint ix = ref.offset >> 2;
    fill_seg[ix + 0] = s.n;
    fill_seg[ix + 1] = s.items.offset;
}

FillItemHeader FillItemHeader_read(FillItemHeaderRef ref) {
    uint ix = ref.offset >> 2;
    uint raw0 = fill_seg[ix + 0];
    uint raw1 = fill_seg[ix + 1];
    FillItemHeader s;
    s.backdrop = int(raw0);
    s.segments = FillSegChunkRef(raw1);
    return s;
}

void FillItemHeader_write(FillItemHeaderRef ref, FillItemHeader s) {
    uint ix = ref.offset >> 2;
    fill_seg[ix + 0] = uint(s.backdrop);
    fill_seg[ix + 1] = s.segments.offset;
}

FillSegment FillSegment_read(FillSegmentRef ref) {
    uint ix = ref.offset >> 2;
    uint raw0 = fill_seg[ix + 0];
    uint raw1 = fill_seg[ix + 1];
    uint raw2 = fill_seg[ix + 2];
    uint raw3 = fill_seg[ix + 3];
    FillSegment s;
    s.start = vec2(uintBitsToFloat(raw0), uintBitsToFloat(raw1));
    s.end = vec2(uintBitsToFloat(raw2), uintBitsToFloat(raw3));
    return s;
}

void FillSegment_write(FillSegmentRef ref, FillSegment s) {
    uint ix = ref.offset >> 2;
    fill_seg[ix + 0] = floatBitsToUint(s.start.x);
    fill_seg[ix + 1] = floatBitsToUint(s.start.y);
    fill_seg[ix + 2] = floatBitsToUint(s.end.x);
    fill_seg[ix + 3] = floatBitsToUint(s.end.y);
}

FillSegChunk FillSegChunk_read(FillSegChunkRef ref) {
    uint ix = ref.offset >> 2;
    uint raw0 = fill_seg[ix + 0];
    uint raw1 = fill_seg[ix + 1];
    FillSegChunk s;
    s.n = raw0;
    s.next = FillSegChunkRef(raw1);
    return s;
}

void FillSegChunk_write(FillSegChunkRef ref, FillSegChunk s) {
    uint ix = ref.offset >> 2;
    fill_seg[ix + 0] = s.n;
    fill_seg[ix + 1] = s.next.offset;
}