Setup Texture Splatmap Generator

Release 0.8.0-Preview.3

Texture utilities

We plan to split texture splating into two stages: splatmap generation which will be done with CUDA before rendering, and terrain texture splatting using the splatmap generated in GLSL shader.

STPTextureFactory

• Refactor to make code more readable and maintainable.
• Cut down the class size by moving most standard library containers inside the function as local variable.

STPTextureDatabase

• Allow accessing splat rule data with getSplatDatabase().
• Rename some of the texture semantics:
  • TextureCollection -> Texture : contains multiple maps of different types.
  • TextureData -> Map : individual texture data of a specific type.
• Add some remove functions to allow dropping texture from the database.
• Allow addTexture() function to take a parameter count to insert count number of texture at once, and return an array of all texture IDs.
• STPTextureDatabase and STPTextureSplatBuilder are now move-constructable and move-assignable.
• Improve code usability for batch queries.

Texture utility testing

• Add STPTestTexture to SuperTest+.
• Fix potential exception throw when prepared statement sqlite3_stmt is finalised, since finalize() may return error codes from the previous operation. This has been mitigated by resetting prepare statement if error is detected.
• Fix syntactic errors in the templates addAltitudes() and addGradients() that cause failed compilation.
• Fixing incorrect use of blob data type.

General improvement and fixes

• Update the concurrency calculator in STPChunkProvider so it matches the latest free-slip algorithm.
• Provide solutions for #25 and #26.
• Refactor STPVoronoiLayer and move namespace alias declaration inside the function.
• Separate the runtime compiler from STPDiversityGeneratorRTC, and now it's presented as a standalone function STPRuntimeCompilable.
• Remove redundant multithreading in STPMasterRenderer.

In order to use runtime compilation feature for STPDiversityGenerator, one must inherit both STPDiversityGenerator and STPRuntimeCompilable, a.k.a., multiple inheritance.

• Link OpenGL as an interface target with our custom GLAD build target in CMake, because GLAD is usually used in conjunction with OpenGL, it doesn't make sense to take them apart.
• Move STPSQLite to the SuperTerrain+ root directory.
• Add a OpenGL compatibility header STPOpenGL and replace all GL type presence exposed in headers with such. This can be used to reduce unnecessary library include and linking.
• Improvement to README.
• Update LICENSE.