New Blur Filter

Release 0.13.14

Bilateral filter (#44)

On top of the current implementation of STPGaussianFilter, a depth-aware bilateral filter is added for more robust blurring for ambient occulusion noise. For now the blur filter supports two different variants:

• Naive Gaussian filter
• Bilateral filter

Also refactor Gaussian kernel generation a little bit.

STPWorldPipeline

• Remove copy local chunk function because it is useless.
• Remove the local chunk complete flag, and check for memory completeness with the old method std::all_of for robustness.
• Fix a bug where there is a chance splatmap of the centre chunk is not updated (because the we had only checked the neighbours).
• When a chunk is reloaded, all its neighbours will also have the splatmap recomputed; previously only the reloading chunk will have it recomputed.
• Wait for stream to finish at the end of loader thread to avoid stalling the rendering thread.
• Add STPConcurrentStreamManager in the world pipeline implementation.
• CUDA async function calls are now sent to multiple streams to maximise the ability of parallelism.

Free-slip erosion

• Separate STPErosionBrushGenerator from STPRainDropSetting.
• Add STPErosionBrush to store information about generated erosion brush.
• Make STPRainDropSetting as a POD-type.
• Remove extra declarations for default functions in STPRainDropSetting, STPHeightfieldSetting and STPConfiguration.
• Refactor rename member variables for consistent style in STPRainDrop.

General fixes and improvement

• Fix a grammar mistake in bug report template.
• Improve STPSingleHistogramFilter with pointer to implementation.
• Add STPSmartEvent as a smartly managed CUDA event object.
• Add STPObjectPool which reuses objects to avoid expensive recreation.
  • Refactor STPHeightfieldGenerator, STPBiomefieldGenerator, STPBiomeFactory and STPSingleHistogramFilter with the new object pool.
• Add test for STPSmartEvent, STPObjectPool and STPSmartDeviceMemory::STPPitchedDeviceMemory.
• Replace an outdated information in STPTestRTC.
• Correct some code style.
• For all use of std::optional, replace unnecessary value() with dereferencing operator to avoid runtime check.
• Fix some typos.
• Remove an unused variable from STPDeferredShading.frag.
• Add a 3rd-party license for water wave shader.
• Add a credit for normal map blending.