Runtime Multi-Biome Generation

Release 0.5.6

Runtime multi-biome heightfield generation in demo program

• Implement runtime-compiled heightfield generation in SuperDemo+ with STPDiversityGeneratorRTC.
• Separate STPBiomeSettings into another struct STPBiomeProperty which is dedicated to be used by runtime compiler to minimise include directories and compile time.
• Split STPAlgorithmDefine into another file STPAlgorithmDeviceInfo.... The former one contains shared library export symbols while the latter one contains path to SuperAlgorithm+Dervice library and include. This reduces file conflicts and remove any need to hard-code the filename based on different configuration.
• Implement multi-biome heightfield generation, generation settings are picked from a biome lookup table indexed by biomemap.

There are 2 biomes implemented in the demo program, being ocean and plains, and the parameters are not the best. The overall terrain looks coarse, we will be looking at biome edge interpolation later.

General fixes and improvement

• Add guard to check for duplicate source name when compiling source with compileSource().
• Fix a case when calling discardSource() the actual nvrtcProgram is not deleted, causing memory leaks.
• Improve error handling on STPDiversityGeneratorRTC and throw exception when necessary.
• Name expressions are now cached into complication database in STPDiversityGeneratorRTC so they can be retrieved later without need to re-typing everything.
• Change the template STPAlgorithmDefine.h.in to output the path to device include and library.
• Add a utility in STPDiversityGeneratorRTC for reading source code from local file.
• Move CMake configure_file output to binary directory (#20).
• Remove redundant gradient table shuffle. Note that the generation result will be different from the previous implementaion.
• Increase the camera height on the demo application.