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@stephen-hqxu stephen-hqxu released this 07 Jan 15:21
v0.9.8
0679d25

Release 0.9.8

Terrain light color

  • Add 2 configurable light color in the terrain shader:
    • Indirect: ambient
    • Direct: diffuse
  • Allow changing individual lighting component color.
  • Introduce the idea of spectrum lighting that allows looking up light color from a pre-computed light spectrum.
  • Wrap the atmosphere scattering algorithm such that it can be used by both the sun renderer and spectrum emulator (which is a compute shader).

STPLightSpectrum

A utility that allows storing terrain light color(s) in an array for looking up in runtime. It currently provides:

  • Static spectrum that defines a monotonic color.
  • Array spectrum that defines user-specified colors.
  • Sun spectrum that uses STPSun to calculate the light spectrum based on the sun elevation.
  • Enable sun spectrum lighting in the demo program.

General fixes and improvement

  • Allow loading displacement map in the demo program. Refactor texture loading and texture type checking.
  • Fix an incorrect return type in the terrain shader.
  • Improve sun direction calculation, remove member variable LocalSolarTime and change Day from unsigned long long to double. Now both time in a day and a year can be calculated using one variable.
  • Replace some size_t with unsigned long long because the underlying type of size_t is platform-dependent.
  • Change the specification of day-night cycle offset. Instead of using angle it now uses sun elevation vector.
  • Add a function in STPProgramManager to allow to query work group size for compute shader program.
  • Add shading language include extension check in STPShaderManager if any include path is specified.
  • STPTexture now requires specifying which GL function to be called explicitly for texture storage and sub-image function.
  • finalise() in STPProgramManager now returns pointer to log.
  • Fix a bug in STPProgramManager that messes up shader type with shader renference ID.
  • Remove the following settings from STPAtmosphereSetting:
    • LowerElevation
    • UpperElevation
    • CycleElevationOffset
  • Improve exception handling in STPLayerManager to avoid memory leak on exception.
  • Improve STPLayerCache caching mechanism. Instead of using a callback function, it now splits caching operation into 3 steps, locate address, read and write.
  • Set sample() function to private in STPLayer.
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