Unit CastleDynLib

With FPC, use cross-platform DynLibs unit.

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Values

• seRaise
• seReturnNil
• seWarnAndReturnNil

Invalid TDynLibHandle value (meaning : LoadLibrary failed)

Disable all dynamic libraries loading. All TDynLib.Load calls will return InvalidDynLibHandle. This is useful:

1. For testing purposes. CGE applications should gracefully work even without various dynamic libraries. E.g. without OpenAL library, no sound is played. Without LibPng we use PNG internal implementation using FpImage.

2. By the build tool. Commands like "castle-engine compile" and "castle-engine clear" want to delete/override dll files, but it is impossible on Windows, because the build tool would use dll files in the project's directory.

   The build tool doesn't need dynamic libraries for anything, but some code pulled by dependencies could accidentally load them. E.g. OpenAL unit loads it in initialization.