Texture Seams Elimination

Release 0.3.4

What's new

• Merging layered rendering buffer into a single rendering buffer, such that texture filtering and edge interpolation that fixes terrain seams are now automatically performed by OpenGL. (#17)
• Completely elimiate normal map edge artifact by selectively pre-copying the edge from previous rendering buffers selectively.
• Post erosion interpolation has been removed completely.
• Implementing built-in memory pool introduced in CUDA 11.2.
• Group rendering buffer updates for all required chunks into a single API call/kernel launch.
• Adding error checking for all CUDA API calls.
• CUDA kernel launch configurations are now determined dynamically, also grid size calculation has been improved to address the case when texture size or raindrop count etc. are not a whole number multiple of block size. (#16)

Fixes and improvements

• Fix an incorrect indexing calculation during rendering buffer generation.
• Remove some redundant const keyword when pass by value.
• Factorise cudaStream_t usage, program reuses stream more efficiently.
• Combine some initialisation functions into the class constructor call so they don't need to be called explicitly.
• Relace std::list with std::vector where applicable.