New sound features: alternative backends, new demo, aliases

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play_sounds demo screenshot
  1. Our sound engine was refactored to support various backends. There are 3 backends available now:

    • OpenAL (full-featured, with spatial (3D) sound support),

    • SOX (only useful for testing — executes command-line sox to play files),

    • and Nintendo Switch sound backend (not open-source, only available for developers who signed an agreement with Nintendo).

  2. A new sound demo in examples/audio/play_sounds is available. This allows to test mixing multiple sounds in various formats at runtime.

  3. Sounds XML file now supports <alias> to create an alias for another sound, or for a group of sounds.

    The latter case allows to play a random sound from a configured set of sounds, without any extra code necessary. This makes it a nice feature for sound designers, that can edit the sounds XML file but probably don’t want to write actual Pascal code.

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Castle Game Engine 6.5 “Beta” available for download, many editor and release improvements

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Editor - Scene Preview
Editor - Image Preview
Editor - Sound Preview

First of all, notice that big shiny button on the main page to download CGE version 6.5. Try it out!

While we work on making next stable 6.6 (or maybe 7.0?) release perfect, you should enjoy using the latest 6.5 snapshot. It’s in practice very stable (at Cat-astrophe Games company we even use it in production). It also contains a ton of new features compared to the last stable release (6.4, more than a year ago), and you should enjoy them:)

Probably the biggest new feature is the Castle Game Engine Editor. It is documented in the manual, and our “Getting Started” page was also updated to clearly advise using it. The 6.5 engine snapshots contain the editor (as well as other tools) in a ready, compiled version. Just execute bin/castle-editor.

Editor and packaging improvements from April:

  1. Selecting file in the file browser (bottom of the editor) opens a small asset preview (useful for scenes, images, and quickly playing sound files).

  2. Double-clicking in the file browser opens a suitable viewer, like view3dscene or castle-view-image.

  3. The editor, build tool and some other tools are now also provided in compiled form, and more integrated. E.g. you no longer need to define CASTLE_ENGINE_PATH environment variable if you just run the editor (or build tool) from the bin subdirectory of the engine. They will find the CGE code (and other tools) in any case.

  4. view3dscene and castle-view-image (formerly called glViewImage) are also distributed along with the engine. No need to download them separately.

  5. When using snapshots, the CGE version number contains the GIT commit hash.

  6. Compiling with the build tool now automatically places relevant DLLs alongside the EXE file on Windows.

  7. CGE applications automatically use Libpng if available, and only fallback on FPImage. You do longer have to compile with any symbol to use Libpng.

  8. Editor “File Browser” automatically hides some files/dirs, like castle-engine-output.

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Engine news (6.5 release snapshots, improvements to editor, TCastleWindowBase, joysticks and more)

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Escape from the Universe - space map design
Escape from the Universe - space map on Nintendo Switch (mockup)
  1. You can now download Castle Game Engine 6.5 “snapshot” (build from the latest GitHub code) from here.

    Until I release a stable Castle Game Engine 6.6, this is the easiest way to test the very latest CGE features (including new GUI editor). I’m working now on making this snapshot fully-automatically updated by Jenkins, and I’ll probably make it linked from our main page soon.

  2. Many editor improvements:

    • Images of TCastleButton are now configurable in the editor.

    • Properties are split into tabs Basic, Layout, Other, All. Note that the Layout tab contains both properties list and anchors UI.

    • Properties TCastleImageControl.Clip, ClipLine, Rotation, RotationCenter are now published and configurable in the editor.

    • You can edit colors in hexadecimal notation, like AABBCC. This allows to easily copy colors between CGE editor and GIMP/Photoshop etc.

    • You can configure TCastleScene animation in the editor (use AutoAnimation, AutoAnimationLoop properties).

  3. TCastleWindowCustom / TCastleControlCustom are renamed to TCastleWindowBase / TCastleControlBase and are simpler to use now, as they by default have a defined background. Control it using the new Container.BackgroundColor and Container.BackgroundEnable properties.

    For new applications, I actually advise using TCastleWindowBase / TCastleControlBase instead of their counterparts TCastleWindow / TCastleControl.

    The downside of using TCastleWindowBase / TCastleControlBase is that you need to add a scene manager instance to them yourself (or using CGE editor). But that’s usually trivial: From code, just do SceneManager := TCastleSceneManager.Create(SomeOwner); Window.Controls.InsertFront(SceneManager);. Or just use CGE editor to add TCastleSceneManager to the appropriate xxx.castle-user-interface design.

    The upside is that you control the moment of creation of the TCastleSceneManager. You don’t have to create it right at the beginning of the application, you don’t have to keep it created until the end of the application. E.g. you can show a main menu, and only create TCastleSceneManager once user presses “Play”. You can even use our TUIState to nicely separate your application into states for this (1 state for “showing the main menu”, 1 state for “playing the game”), and our UI controls play nicely with this (whether you create them in code, or design in CGE editor).

  4. FindFiles is now reliable and cross-platform. Can search recursively in game data (using castle-data:/ protocol) always, even e.g. in Android assets or Nintendo Switch game data.

  5. TGLImage and TGLImageCore are finally merged into one class, TDrawableImage . This makes them simpler.

  6. New class TCastleImagePersistent allows to load images (TDrawableImage) with caching, and can be used to configure image in the editor comfortably. It is used by TCastleImageControl and TCastleButton already.

  7. Joysticks:

    • Refactored (moved a lot of code into platform-specific “backend” classes in separate, internal units).
    • Various API improvements. E.g. you can now just use Joysticks.Count, Joysticks[0].Axis (TVector2).
    • Joysticks work also on Nintendo Switch now.
  8. Introduced static properties TRenderingAttributes.DefaultMinificationFilter, DefaultMagnificationFilter.

    This allows to e.g. easily disable mipmaps in all scenes on some cases, by TRenderingAttributes.DefaultMinificationFilter := minLinear;

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Castle Game Engine supports Nintendo Switch!

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Escape from the Universe on Nintendo Switch - design
Escape from the Universe on Nintendo Switch - in CGE editor

Castle Game Engine now supports compiling your games to the Nintendo Switch console ! A modern, succesfull, indie-friendly console from Nintendo.

It is a full integration, really 100% of the engine works on Nintendo Switch. From the developer point of view, you just write cross-platform Pascal code using CGE units, and then you can recompile the application using the Castle Game Engine build tool with --target=nintendo-switch.

Note that the integration code with Nintendo Switch is not public and not open-source. It cannot be, as we are covered by Nintendo NDA agreements and we cannot disclose the technological details about how Nintendo Switch works. To develop on Nintendo Switch, you have to:

  • Become a Nintendo Developer yourself, and sign the necessary NDA agreements between your company and Nintendo. You will most likely want to buy a developer version of the console, as well.
  • Contact me (Michalis Kamburelis) through the non-public Nintendo developer forum. I can then share with you the necessary code that adds Nintendo Switch integration on top of the open-source CGE core, through the Nintendo forum, so Nintendo can confirm it’s legally OK with them. Of course you get this for free. The integration code cannot be open-source, but I still want to give it to everyone for free.

Enjoy a truly cross-platform game engine in Pascal!

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Android improvements – shadow maps, 64-bit support, upgrades and fixes

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"Little Things" game on Android'
  • Shadow maps work on OpenGLES (Android and iOS) now!

  • The Android building tools, which are part of our build tool, were updated. We use a new version of Gradle and Android Gradle Plugin under the hood, and by default we compile using Android platform 27. The minimal supported Android version is lower of course — it is 16 (Android 4.1), Android NDK doesn’t support older versions now.

  • You can now build an APK for 64-bit version of Android, which will be required by the Google Play store since August 2019. Use our build tool to compile an APK with both 32-bit and 64-bit variants (for best compatibility): castle-engine package --target=android. Alternatively, you can build a 64-bit-only APK with castle-engine package --os=android --cpu=aarch64. This requires FPC 3.3.1 with Android/Aarch64 cross-compiler.

  • The default project type is now “integrated”, which allows to define various services and also automatically adds OpenAL (sounds), Tremolo (OggVorbis reading), FreeType (font file reading) libraries to your Android project, if they seem necessary (if your data files contain some sound files, .ogg, .ttf etc. files).

  • The latest source code of the Android libraries we use is available in relevant CGE repositories: android-openal, android-tremolo, android-freetype.

  • A couple of bugfixes to Android building were applied. We now use Android NDK platform 16 (for 32-bit builds), not newer, to really work even on Android 4.1. We fixed FreeType usage (so that it works even on older Android devices). And we improved the documentation how to setup your Android SDK/NDK environment.

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Documentation improvements

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TCP client/server with Indy and Castle Game Engine

Because people will read again, I improved various parts of our documentation:

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Sprite Demo from Valter Buccina

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Sprite Demo

Valter Buccina made a demo application using sprites in Castle Game Engine.

The demo is available on

Citing from the README:

Demo is divided into two parts:

  1. Goniometer
  2. Road demo

The first shows with extreme precision the direction of the sprite in degrees. Using mouse click coordinates and Player position we apply the arctangent formula and convert the value obtained in degrees. This way we get the requested direction.

The second one is a demo with a road background where you can move the sprite that is sized according to the distance from the observation point. One click to walk, double click to run. Run animation is divided into three actions, short initial walk, run, short final walk but it is not perfect.

See the forum post for details. (This post was on an old forum — please use new forum for comments.)

Thank you!

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New rendering capabilities

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Screenshot of selection at 2019-02-17 22:01:23
Screenshot of selection at 2019-02-17 22:01:41
  • New Appearance.alphaChannel field (TAppearanceNode.AlphaChannel in Pascal) determines alpha channel treatment when rendering a shape with given appearance. We can use alpha testing, alpha blending, or ignore the alpha channel (render as opaque).

    This field overrides the engine auto-detection “how to treat alpha”, which normally looks at Material.trasparent and the alpha channels of textures (which can, in turn, be affected by ImageTexture.alphaChannel). If you set Appearance.alphaChannel to something other than "AUTO" then we avoid any auto-detection, and we just render according to this field.

    This corresponds to glTF alphaMode.

  • New utility methods TCastle2DSceneManager.PositionTo2DWorld and TCastleSceneManager.PositionToWorldPlane have been added, to easily convert mouse/touch position into a position inside 3D/2D game world.

    Our example 2d_dragon_spine_game inside CGE sources demonstrates this, using SceneManager.PositionToWorldPlane to determine target position of the dragon. Also, this example now demonstrates animation blending.

  • glTF texture can be converted to a MovieTexture . If your texture URL is like .avi or .mpg, we will automatically load it as MovieTexture in X3D, and it will actually play in a loop (if you have ffmpeg installed).

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