SimpleTextureAtlas.h

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#pragma once
 
#include <string>
#include <unordered_map>
#include <vector>
 
#include <tdme/tdme.h>
#include <tdme/engine/fwd-tdme.h>
#include <tdme/utilities/fwd-tdme.h>
 
using std::string;
using std::unordered_map;
using std::vector;
 
using tdme::engine::Texture;
 
/**
 * Simple texture atlas
 * @author Andreas Drewke
 */
class tdme::utilities::SimpleTextureAtlas {
public:
    static constexpr int TEXTURE_IDX_NONE { -1 };
    static constexpr int ATLAS_TEXTURE_SIZE { 512 };
    static constexpr int ATLAS_TEXTURE_BORDER { 32 };
 
    // forbid class copy
    FORBID_CLASS_COPY(SimpleTextureAtlas)
 
    /**
     * Public constructor
     * @param id texture id
     */
    SimpleTextureAtlas(const string& id);
 
    /**
     * Public destructor
     */
    ~SimpleTextureAtlas();
 
    /**
     * Returns specific atlas texture index within atlas
     * @param texture texture
     * @return atlas texture id
     */
    inline int getTextureIdx(Texture* texture) {
        auto it = textureToAtlasTextureIdxMapping.find(texture);
        if (it == textureToAtlasTextureIdxMapping.end()) {
            return TEXTURE_IDX_NONE;
        }
        return it->second;
    }
 
    /**
     * Add texture
     * @param texture texture
     * @return atlas texture id
     */
    int addTexture(Texture* texture);
 
    /**
     * Remove texture
     * @param texture texture
     */
    void removeTexture(Texture* texture);
 
    /**
     * Update texture atlas
     */
    void update();
 
    /**
     * @return is requiring update
     */
    inline bool isRequiringUpdate() {
        return requiresUpdate;
    }
 
    /**
     * @return atlas texture
     */
    inline Texture* getAtlasTexture() {
        return atlasTexture;
    }
 
private:
    bool requiresUpdate { false };
    string atlasTextureId;
    Texture* atlasTexture { nullptr };
    unordered_map<Texture*, int> textureReferenceCounter;
    unordered_map<Texture*, int> textureToAtlasTextureIdxMapping;
    unordered_map<int, Texture*> atlasTextureIdxToTextureMapping;
    vector<int> freeTextureIds;
};