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Multi-Scale Texturing

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@stephen-hqxu stephen-hqxu released this 21 Feb 17:56
v0.12.0
e1f05d0

Release 0.12.0

Improve texturing system

STPTextureDatabase

Introduce a new texture group, texture view group, which specifies the UV scale of a particular texture. Remember a texture is a collection of many texture maps, such that the view group settings will be applied to all texture maps under texture as well.

The new system allows specification of 3 different UV scales, and the scales will be chosen by the renderer based on user-specified distance to the texel.

  • Remove multi-add functions such as addTextures() because they seem to be useless after the introduction of texture definition language.
  • addTexture() now allows assigning, optionally, a user-specified name to the texture.
  • Restructure texture group logic, rename texture group to map group to disambiguate.
  • Refactor database record manupulation functions a little bit.

STPTextureDefinitionLanguage

The specification of TDL has been updated to add support for the new texture view group system. The view group is specified using a new directive, #group and is identified by group type view.

For more information about the new syntax, check out TDL specification in the project documentation.

General fixes and improvement

  • Resolve issue #36.
  • Simplify STPSimplexNoise calculation, remove redundant arithmetic operations.
  • All camera-related calculations (viewer camera, light-space camera etc.) are now all done with double on host side before converting to float and sending to device.

STPHeightfieldTerrain

  • Fix an incorrect texture region dictionary boundary check logic in the fragment shader which could result in out-of-bound array access.
  • Noise scale used for stratified sampling now uses unsigned int rather than float, because a real number will make the uv scale non-aligned with tile boundaries and the whole texture tiles move when switching centre chunk.
  • Refactor texture smoothing using histogram bins instead of fetching texture in every iteration during splatmap smoothing to greatly reduce memory bandwidth overhead.
  • Remove UVScaleFactor from STPMeshSetting, add STPTextureScaleDistanceSetting to control texture scale to be made active based on texel distance.
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