TextureAtlasLayout.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "CeresEngine/DataTypes.hpp"
 
#include "CeresEngine/Foundation/Container/Vector.hpp"
 
namespace CeresEngine {
 
    class TextureAtlasLayout {
        struct Node {
            UInt32 x = 0;
            UInt32 y = 0;
            UInt32 width = 0;
            UInt32 height = 0;
            UInt32 children[2]{std::numeric_limits<UInt32>::max(), std::numeric_limits<UInt32>::max()};
            bool nodeFull = false;
 
            constexpr Node() = default;
            constexpr Node(const UInt32 x, const UInt32 y, const UInt32 width, const UInt32 height) : x(x), y(y), width(width), height(height) {}
        };
 
        UInt32 mInitialWidth = 0;
        UInt32 mInitialHeight = 0;
        UInt32 mWidth = 0;
        UInt32 mHeight = 0;
        bool mPow2 = false;
 
        Vector<Node> mNodes;
 
    public:
        TextureAtlasLayout() = default;
 
        TextureAtlasLayout(const UInt32 width, const UInt32 height) : mInitialWidth(width), mInitialHeight(height), mWidth(width), mHeight(height), mPow2(false) {
            mNodes.push_back(Node(0, 0, width, height));
        }
 
        TextureAtlasLayout(const UInt32 width, const UInt32 height, const UInt32 maxWidth, const UInt32 maxHeight, const bool pow2 = false)
                : mInitialWidth(width), mInitialHeight(height), mWidth(width), mHeight(height), mPow2(pow2) {
            mNodes.push_back(Node(0, 0, maxWidth, maxHeight));
        }
 
        [[nodiscard]] bool addElement(UInt32 width, UInt32 height, UInt32& x, UInt32& y);
 
        void clear();
 
        [[nodiscard]] bool isEmpty() const { return mNodes.size() == 1; }
 
        [[nodiscard]] UInt32 getWidth() const { return mWidth; }
 
        [[nodiscard]] UInt32 getHeight() const { return mHeight; }
 
    private:
        bool addToNode(UInt32 nodeIdx, UInt32 width, UInt32 height, UInt32& x, UInt32& y, bool allowGrowth);
    };
 
    class TextureAtlasUtility {
    public:
        struct Element {
            struct {
                UInt32 width, height;
            } input;
 
            struct {
                UInt32 x, y;
                UInt32 idx;
                Int32 page;
            } output;
        };
 
        struct Page {
            UInt32 width, height;
        };
 
        [[nodiscard]] static Vector<Page> createAtlasLayout(Vector<Element>& elements, UInt32 width, UInt32 height, UInt32 maxWidth, UInt32 maxHeight,
            bool pow2 = false);
    };
 
} // namespace CeresEngine