Cross-Platform (Win32, Linux) upto Hardware Texturing (with swizzling, coalescing, filtering and logging)

[KaivalyaD]

Changelog

• Defined a new platform detection macro BUILD_PLATFORM_LINUX for clean conditional compilation
• Using only lower-case letters for all source/header filenames (for gcc, source filenames are case-sensitive)
• Using immintrin.h on linux and intrin.h on Windows
• Using conditional compilation to choose API and intrinsics (names, ABI, etc.)
• Changed the windows-specific path separator \ to the standard /
• Using the POSIX API instead of Win32 API (for ex. argv[0] instead of calling GetModuleFileNameA())
• Added a compiler option (-march=native) on linux enable some intrinsics (like _lcntz_u64)
• Using the .insn dot-directive to specify custom instructions instead of recompiling gcc
• Using TBB12 on linux as if it was installed using a package manager (thus, ignoring the supplied binaries)

Note:

1. Arches must be run with the --dataset-dir command line argument which must be set to a valid datasets directory path with the following structure:

datasets
│   sceneA.mtl
│   sceneA.obj
│   sceneB.mtl
│   sceneB.obj
|   ...
├─── cache
│       sceneA.bvh
│       sceneB.bvh
│       ...
└─── textures
        textureA.jpg
        textureB.jpg
        ...

2. Native kernels (like trax-kernel.exe) must be run from the parent directory of the datasets folder.