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Deobfuscate lighting illumination calculation

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This commit is contained in:
Alexei Kotov 2024-04-30 16:26:10 +03:00
parent a57c350c08
commit 6b90d7f1da
1 changed files with 41 additions and 9 deletions
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50
files/shaders/lib/light/lighting_util.glsl
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@ -59,6 +59,39 @@ uniform int PointLightCount;
#endif #endif
float lcalcConstantAttenuation(int lightIndex)
{
#if @lightingMethodPerObjectUniform
return @getLight[lightIndex][0].w;
#elif @lightingMethodUBO
return @getLight[lightIndex].attenuation.x;
#else
return @getLight[lightIndex].constantAttenuation;
#endif
}
float lcalcLinearAttenuation(int lightIndex)
{
#if @lightingMethodPerObjectUniform
return @getLight[lightIndex][1].w;
#elif @lightingMethodUBO
return @getLight[lightIndex].attenuation.y;
#else
return @getLight[lightIndex].linearAttenuation;
#endif
}
float lcalcQuadraticAttenuation(int lightIndex)
{
#if @lightingMethodPerObjectUniform
return @getLight[lightIndex][2].w;
#elif @lightingMethodUBO
return @getLight[lightIndex].attenuation.z;
#else
return @getLight[lightIndex].quadraticAttenuation;
#endif
}
#if !@lightingMethodFFP #if !@lightingMethodFFP
float lcalcRadius(int lightIndex) float lcalcRadius(int lightIndex)
{ {
@ -70,17 +103,16 @@ float lcalcRadius(int lightIndex)
} }
#endif #endif
float lcalcIllumination(int lightIndex, float lightDistance) float lcalcIllumination(int lightIndex, float dist)
{ {
#if @lightingMethodPerObjectUniform float illumination = 1.0 / (lcalcConstantAttenuation(lightIndex) + lcalcLinearAttenuation(lightIndex) * dist + lcalcQuadraticAttenuation(lightIndex) * dist * dist);
float illumination = clamp(1.0 / (@getLight[lightIndex][0].w + @getLight[lightIndex][1].w * lightDistance + @getLight[lightIndex][2].w * lightDistance * lightDistance), 0.0, 1.0); // FIXME: FFP doesn't do this
return (illumination * (1.0 - quickstep((lightDistance / lcalcRadius(lightIndex)) - 1.0))); illumination = clamp(illumination, 0.0, 1.0);
#elif @lightingMethodUBO #if @lightingMethodPerObjectUniform || @lightingMethodUBO
float illumination = clamp(1.0 / (@getLight[lightIndex].attenuation.x + @getLight[lightIndex].attenuation.y * lightDistance + @getLight[lightIndex].attenuation.z * lightDistance * lightDistance), 0.0, 1.0); // Fade illumination between the radius and the radius doubled to diminish pop-in
return (illumination * (1.0 - quickstep((lightDistance / lcalcRadius(lightIndex)) - 1.0))); illumination *= 1.0 - quickstep((dist / lcalcRadius(lightIndex)) - 1.0);
#else
return clamp(1.0 / (@getLight[lightIndex].constantAttenuation + @getLight[lightIndex].linearAttenuation * lightDistance + @getLight[lightIndex].quadraticAttenuation * lightDistance * lightDistance), 0.0, 1.0);
#endif #endif
return illumination;
} }
vec3 lcalcPosition(int lightIndex) vec3 lcalcPosition(int lightIndex)