57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
// vim:fileencoding=utf-8:foldmethod=marker
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#ifndef PROP_TABLE_H
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#define PROP_TABLE_H
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#include "entity_id.h"
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#include "wapp/wapp.h"
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template<typename T>
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struct PropTable {
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PropTable(const Allocator *allocator, u64 capacity) {
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lookup = wapp_array_alloc_capacity(i32, allocator, capacity, ARRAY_INIT_FILLED);
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values = wapp_array_alloc_capacity(Value, allocator, capacity, ARRAY_INIT_NONE);
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for (u64 i = 0; i < wapp_array_count(lookup); ++i) {
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lookup[i] = -1;
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}
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}
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void add_prop(EntityID id, T prop) {
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if (IS_INVALID_ID(id)) { return; }
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i32 idx = (i32)wapp_array_count(values);
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Value v = {prop, id.index};
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wapp_array_set(i32, lookup, id.index, &idx);
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wapp_array_append_capped(Value, values, &v);
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}
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void remove_prop(EntityID id) {
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if (IS_INVALID_ID(id) || *wapp_array_get(i32, lookup, id.index) == -1) { return; }
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// Get indices for swapping
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i32 idx1 = *wapp_array_get(i32, lookup, id.index);
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i32 idx2 = ((i32)wapp_array_count(values)) - 1;
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// Swap values
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values[idx1] = values[idx2];
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wapp_array_pop(Value, values);
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// Update index
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lookup[id.index] = -1;
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lookup[values[idx1].index] = idx1;
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}
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struct Value {
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T value;
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u32 index;
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};
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typedef Value *ValueArray;
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I32Array lookup;
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ValueArray values;
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};
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#endif // !PROP_TABLE_H
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