OrdinaryMagician/vkdoom_m
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Use inverse square distance attenuation for PBR materials

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Magnus Norddahl 2024-10-03 16:55:01 +02:00
commit b06649097f
1 changed files with 11 additions and 12 deletions
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23
wadsrc/static/shaders/scene/lightmodel_pbr.glsl
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@ -45,23 +45,22 @@ vec3 fresnelSchlickRoughness(float cosTheta, vec3 F0, float roughness)
return F0 + (max(vec3(1.0 - roughness), F0) - F0) * pow(1.0 - cosTheta, 5.0);
}
float quadraticDistanceAttenuation(vec4 lightpos)
{
float strength = (1.0 + lightpos.w * lightpos.w * 0.25) * 0.5;
vec3 distVec = lightpos.xyz - pixelpos.xyz;
float attenuation = strength / (1.0 + dot(distVec, distVec));
if (attenuation <= 1.0 / 256.0) return 0.0;
return attenuation;
}
float linearDistanceAttenuation(vec4 lightpos)
{
float lightdistance = distance(lightpos.xyz, pixelpos.xyz);
return clamp((lightpos.w - lightdistance) / lightpos.w, 0.0, 1.0);
}
float inverseSquareDistanceAttenuation(vec4 lightpos)
{
float strength = 1500.0;
float d = distance(lightpos.xyz, pixelpos.xyz);
float r = lightpos.w;
float a = d / r;
float b = clamp(1.0 - a * a * a * a, 0.0, 1.0);
return (b * b) / (d * d + 1.0) * strength;
}
vec3 ProcessMaterialLight(Material material, vec3 ambientLight)
{
vec3 worldpos = pixelpos.xyz;
@ -97,7 +96,7 @@ vec3 ProcessMaterialLight(Material material, vec3 ambientLight)
vec3 L = normalize(lightpos.xyz - worldpos);
vec3 H = normalize(V + L);
float attenuation = linearDistanceAttenuation(lightpos);
float attenuation = inverseSquareDistanceAttenuation(lightpos);
if (lightspot1.w == 1.0)
attenuation *= spotLightAttenuation(lightpos, lightspot1.xyz, lightspot2.x, lightspot2.y);
if (lightcolor.a < 0.0)