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Using AssetsManager
The AssetsManager is the core component in effective media management inside your Gorilla3D application. Models, textures, audio, dialogues and so on will be cached for faster access and reusage. You can build packages within the AssetsManager for modular media management. For example: you could build a package for the main character and reference to it in every scene package. Scene packages are extremly useful for compact and fast loading of all data in a scene.
Package
An assets package is the management unit to handle groups and their attached assets. Each asset can be a different type of media (model, texture, audio,…). and is able to manage further sub-groups of assets. This structure allows a complex and flexible asset structure for your project.
The assets manager allows two kinds of packages.
Package Type | Description |
---|---|
File-Based | The package data is loaded on-the-fly from file by a TFileStream. Do not modify position or data of that stream. |
In-Memory | The package data is stored completely as TMemoryStream in memory. The data is compressed as zip-stream to reduce memory. Do not modify position or data of this stream. |
Packages are kept simple and transparent. File-based packages can be viewed easily by a typical ZIP-Viewer.
Groups
Each package provides a number of fixed group entries to organize media content. Those groups are fixed to allow automatic load/save for specific media types. For example: A model texture is getting loaded implicitly by loading the model, but the assets manager needs to know where to store. By detecting the file extension he is able to organize the media file into the package.
Default group ids to access the specific group of each package are:
Constant | Value | Extensions |
---|---|---|
GORILLA_ASSETS_MODEL | 0 | *.obj, *.g3d, *.dae, *.stl, *.x3d, *.x3dvz, *.x3dz, *.fbx, *.gltf, *.babylon, *.ply, *.skp |
GORILLA_ASSETS_TEXTURE | 1 | *.bmp, *.jpg, *.jpeg, *.dds, *.gif, *.png, *.tif, *.tiff, *.tga |
GORILLA_ASSETS_AUDIO | 2 | *.aiff, *.asf, *.asx, *.dls, *.flac, *.fsb, *.it, *.m3u, *.midi, *.mod, *.mp2, *.mp3, *.ogg, *.pls, *.s3m, *.vag, *.wav, *.wax, *.wma, *.xm, *.xma (FMOD Support activated) |
GORILLA_ASSETS_VIDEO | 3 | *.mp4, *.mpg and *.mpeg |
GORILLA_ASSETS_MISC | 4 | *.txt, *.json, *.xml |
GORILLA_ASSETS_DIALOGUE | 5 | *.dia, *.dlg |
GORILLA_ASSETS_INVENTORY | 6 | *.iff |
GORILLA_ASSETS_SCRIPT | 7 | *.pas |
GORILLA_ASSETS_PREFAB | 8 | *.prefab |
Sub-Groups
Since 0.8.3 also assets can contain groups or so called sub-groups. This is getting important especially for TGorillaModelAsset which can contain textures, prefabs or scripts. Because in elder assets manager versions it lead to name conflicts for textures, when models were loaded with equal texture names.
Assets
A media file is represented as extended TGorillaAsset instance inside in a specific group in an assets package. Depending on the media type the asset holds the data.
TGorillaModelAsset
A TGorillaModelAsset holds model and animation data by the internal definition format TModelDef. The asset converts all original model formats and writes them in G3D format to the zip-archive.
Caution: The original file extension will be kept! Due to linked names inside of the structure, otherwise relinking model of load from package will fail.
The following example shows how to load and show a model from a file-based package.
procedure TForm1.LoadMyModel(); var LGrp : TGorillaAssetsGroup; LAst : TGorillaModelAsset; LDef : TModelDef; begin // load a file-based package FPackage := FPackage := FAssetsManager.LoadPackageFromFile('mypackage.zip'); // get the model def from archive LGrp := FPackage.GetGroup(GORILLA_ASSETS_MODEL); LAst := LGrp.FindAssetByFilename('mymodel.dae') as TGorillaModelAsset; LDef := LAst.Model as TModelDef; // create a visual instance from model definition FModel := TGorillaModel.LoadNewModelFromDef(FViewport, LDef, []); FModel.Parent := FViewport; FModel.SetHitTestValue(false); end;
TGorillaTextureAsset
TGorillaTextureAsset is a pseudo asset. It doesn't hold any data in memory. When asset data is requested it will always load up the data from archive again. The asset stores textures in PNG file format to the archive to preserve alpha channel.
procedure TForm1.LoadImage(); var LGrp : TGorillaAssetsGroup; LAst : TGorillaTextureAsset; LBmp : TBitmap; begin // load a file-based package FPackage := FPackage := FAssetsManager.LoadPackageFromFile('mypackage.zip'); // get the model def from archive LGrp := FPackage.GetGroup(GORILLA_ASSETS_TEXTURE); LAst := LGrp.FindAssetByFilename('image1.png') as TGorillaTextureAsset; // this will request bitmap data from archive stream LBmp := LAst.Bitmap; try // we then assign it to our image on the form Image1.Bitmap.Assign(LBmp); finally LBmp.free(); end; end;
TGorillaAudioAsset
Holds audio files in a TMemoryStream and writes those in original file format to zip-archive.
TGorillaVideoAsset
Holds video files in a TMemoryStream and writes those in original file format to zip-archive.
TGorillaMiscAsset
Used for unspecified file formats. Currently supported *.txt, *.json and *.xml. Holds data in a TMemoryStream and writes those in original file format to zip-archive.
TGorillaDialogueAsset
Holds dialogue data in a TMemoryStream and writes those as *.dia file to zip-archive.
TGorillaInventoryAsset
Holds inventory configuration data in a TMemoryStream and writes those as *.iff file to zip-archive.
TGorillaScriptAsset
Holds a script file in a TMemoryStream and writes those as *.pas file to zip-archive.
TGorillaPrefabAsset
Holds a prefab file in a TMemoryStream and writes those as *.prefab file to zip-archive.
DesignTime
You can find the TGorillaAssetsManager component in the toolbar. Simply drag and drop onto your form.
In the next step we need to create a new package in “Packages” property by the Delphi collection editor.
Example
Creating package at runtime
Alternatively you can create the assets manager and packages at runtime.
- Form1.pas
var FAssetsManager : TGorillaAssetsManager; FPackage : TGorillaAssetsPackage; procedure TForm1.CreatePackage(); begin FAssetsManager := TGorillaAssetsManager.Create(Self); FPackage := FAssetsManager.AddEmptyPackage(GORILLA_PACKAGE_DEFAULT); end;
Loading package from file
You can easily setup packages by the Gorilla3D assets manager tool. There you can also save packages to file, which can be loaded at runtime in your program.
- Form1.pas
procedure TForm1.LoadPackage(const AFilename : String); begin FAssetsManager := TGorillaAssetsManager.Create(Self); FPackage := FAssetsManager.LoadPackageFromFile(AFilename); end;
Storing your assets package at runtime
Of course you are allowed to store the assets package you've setup. Easily use the provided SaveToFile method of each package instance.
- Form1.pas
procedure TForm1.SavePackage(const AFilename : String); begin FPackage.SaveToFile(AFilename); end;
Finding an asset inside of a package
1) Each assets has an unique id (GUID) when added to the package by which we can find it exactly.
- Form1.pas
// finding an asset in a specific group by its unique id LAssetId := '{18E01973-D452-4596-A1A1-C51F09763954}'; FPackage.GetAssetFromId(GORILLA_ASSETS_TEXTURE, LAssetId);
2) Get asset by its filename
Caution: This method will automatically import the asset from supplied file, if it can not be found.
- Form1.pas
// finding an asset in a specific group by its filename LAssetFile := 'texture0.png'; FPackage.GetAssetFromFile(GORILLA_ASSETS_TEXTURE, LAssetFile);
3) Get asset by its filename and stream
Caution: This method will automatically import the asset from supplied stream, if it can not be found.
- Form1.pas
// finding an asset in a specific group by its filename LAssetFile := 'texture0.png'; FPackage.GetAssetFromStream(GORILLA_ASSETS_TEXTURE, LAssetFile, AStream);
Next step: Billboard