TextureAtlasViewer.h

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#pragma once
 
#if EDITOR
 
#include <cstdint>
#include <string>
#include "imgui.h"
 
class Texture;
class Image;
 
class TextureAtlasViewer
{
public:
    ~TextureAtlasViewer();
 
    void DrawPanel();
 
private:
    // Loaded texture asset
    Texture* mTexture = nullptr;
    ImTextureID mImGuiTexId = 0;
    // Resource generation mImGuiTexId was built from. See Texture::GetResourceGeneration().
    uint32_t mTexGeneration = 0;
    uint32_t mAtlasWidth = 0;
    uint32_t mAtlasHeight = 0;
 
    // Atlas grid configuration
    int32_t mTileWidth = 8;
    int32_t mTileHeight = 8;
 
    // Selection
    int32_t mSelectedTileIndex = -1;
    int32_t mHoveredTileIndex = -1;
 
    // Manual tile index lookup
    int32_t mLookupTileIndex = 0;
 
    // Zoom
    float mZoom = 2.0f;
 
    void SetTexture(Texture* tex);
    void ClearTexture();
    void DrawControls();
    void DrawAtlasImage();
    void DrawTilePreview();
};
 
TextureAtlasViewer* GetTextureAtlasViewer();
 
#endif