lib-alpha.glsl

Public Functions: alphaKill

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import lib-sampler.glsl
 import lib-random.glsl
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import lib-sampler.glsl
 import lib-random.glsl

Opacity map, provided by the engine.

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//: param auto channel_opacity
 uniform SamplerSparse opacity_tex;
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//: param auto channel_opacity
 uniform SamplerSparse opacity_tex;

Alpha test threshold.

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//: param custom {
 //: "default": 0.33,
 //: "label": "Alpha threshold",
 //: "min": 0.0,
 //: "max": 1.0,
 //: "group": "Common Parameters"
 //: }
 uniform float alpha_threshold;
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//: param custom {
 //: "default": 0.33,
 //: "label": "Alpha threshold",
 //: "min": 0.0,
 //: "max": 1.0,
 //: "group": "Common Parameters"
 //: }
 uniform float alpha_threshold;

Alpha test dithering.

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//: param custom {
 //: "default": false,
 //: "label": "Alpha dithering",
 //: "group": "Common Parameters"
 //: }
 uniform bool alpha_dither;
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//: param custom {
 //: "default": false,
 //: "label": "Alpha dithering",
 //: "group": "Common Parameters"
 //: }
 uniform bool alpha_dither;

Emulate alpha test : discard current fragment if its opacity is below a user defined threshold. Should be called AFTER texture sampling calls: it can break derivatives

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void alphaKill(float alpha)
 {
  float threshold = alpha_dither ? getBlueNoiseThresholdTemporal() : alpha_threshold;
  if (alpha < threshold) discard;
 }
 
 void alphaKill(SparseCoord coord)
 {
  alphaKill(getOpacity(opacity_tex, coord));
 }
 
 
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void alphaKill(float alpha)
 {
  float threshold = alpha_dither ? getBlueNoiseThresholdTemporal() : alpha_threshold;
  if (alpha < threshold) discard;
 }
 
 void alphaKill(SparseCoord coord)
 {
  alphaKill(getOpacity(opacity_tex, coord));
 }
 
 

Last updated 12/6/2023

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