Finishing up Ray Tracing Framework

Release 0.15.0-Preview.3

SSRI shader

• Reduce primitive vertex memory and payload register usage by replacing vertex position with ray time to calculate the intersection position.
• Refactor geometry attribute for vertex and index data into 2 structures for easier data accessing. This is placed in a new file STPGeometryAttributeFormat.hpp.
• Fix some OptiX shader compiler flags, it should be using a physical architecture.
• Add a new public GLSL header STPRayTracedIntersectionData.glsl for sharing SSRI data with each renderers.
• Add check for the scene memory limit in STPExtendedScenePipeline to make sure it does not exceed the maximum allowance of each shader.

General fixes and improvement

• Deprecate and remove STPMemoryPool to save memory.
• Add a new smart device memory object STPPinnedMemory for management of memory allocated by cudaMallocHost.
• Improve documentation for STPSingleHistogramFilter.
• Don't need to check for last CUDA error when launching a kernel via cuLaunchKernel.
• Fix use of explicit template specialisation without declaration in the header, which is UB, in:
  • STPTexture
  • STPFrameBuffer
• Exclude structure definitions for types used in shaders only in STPTextureInformation for compatibility between NVRTC and other compilers.
• using cleans up for various scene components.
• For NVRTC used in STPTestRTC and STPCommonCompiler, zero-init the log outputs for them to avoid printing garbage string.
• Remove linking against CUBIN in STPDeviceRuntimeProgram because CUDA does not support.
• Disable representative fragment testing during normal rendering because this is not how it is supposed to be used.
• Add a new documentation entry regarding SSBO index usage.

Compiler-specific warnings and errors

• Avoid a signed-unsigned comparison in STPWorldPipeline.
• Ensure enum type for shader memory type in STPExtendedScenePipeline provided is valid.
• Add extra parentheses in STPScenePipeline for clarity.
• Add dependent template specifier in STPNullablePrimitive.
• Remove TypeCount from STPTextureType because it is no longer useful.

STPThreadPool

• Fix the thread pool for proper tasks completion before pool is destroyed.
• Fix a UB test case on thread pool when the pool is used after is has been destroyed.
• Improve test case for the thread pool.
• Remove STPDeadThreadPool exception.
• Add a new license regarding our new thread pool implementation.

GL API consistency

• Add more GL compatibility types to STPOpenGL.
• Add GL vector types, which stay in a new file STPGLVector.hpp under STPRealism.
• Improve consistency for GL objects wrapper with GL specification, for:
  • STPBuffer
  • STPFrameBuffer
  • STPImageParameter
  • STPRenderBuffer
  • STPSampler
  • STPTexture