Setup Scene Pipeline

Release 0.9.0-Preview.3

SuperRealism+

• Remove STPContextStateManager as it is being redundant and unhelpful.
• Add STPScenePipeline as a master rendering pipeline for the entire procedural terrain.
• Setup STPHeightfieldTerrain as a heightfield-based terrain renderer. It aims to replace STPProcedural2DINF in the demo program.
• Improve STPShaderManager, add a helpful function to allow to define macros in the shader source before compilation.
• To reduce verbosity, remove all error handling in STPDebugCallback except important functions.
• Also implement a shader include internal cache in STPShaderManager for auto shader include and cross GL context support.
• Fix incorrect shader include directory.
• Fix illegam memory access in STPHeightfieldTerrain where reading source code as a reference from a temporarily created STPFile.
• Fix incorrect condition check during shader include and keeps throwing exception for not found include source.
• Fix issues in the camera class for mixing up degrees and radians.
• Move camera setting structs to separate files under STPEnvironment namespace.

SuperDemo+

• Remove SglToolkit as dependencies, the demo program is now self-contained as a rendering engine.
• Remove all renderers because SuperRealism+ will do the job instead.
• Restructure the starter function STPStart.
• Improve general coding practice and readability.

General fixes and improvement

• Fix the extension directive for GLSL shader, prefixed with GL_.
• Remove state record in STPDebugCallback and instead using GL query functions. This allows better support to multiple GL contexts.
• Add a simple helper function in STPFile for build filename.
• Replace shader filename processing in STPSun with compile-time functions instead of using std::string to allocate memory.
• Remove deprecated notes in the Readme, add more references.
• Change returned value in STPTextureFactory, instead of throwing exception when type is unregistered, it returns a flag.
• Remove all getters from STPConfiguration as it is very unecessary.
• Fixed an issue in STPShaderIncludeManager that incorrectly deletes an array with scalar deleter.
• Move STPMeshSetting to SuperRealism+.