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- Change PBR materials to use quadratic light falloff

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This commit is contained in:
Magnus Norddahl 2018-02-03 13:17:09 +01:00
parent 747ef8324e
commit 7b9a334f77
1 changed files with 27 additions and 2 deletions
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29
wadsrc/static/shaders/glsl/main.fp
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@ -432,6 +432,31 @@ vec3 fresnelSchlickRoughness(float cosTheta, vec3 F0, float roughness)
return F0 + (max(vec3(1.0 - roughness), F0) - F0) * pow(1.0 - cosTheta, 5.0);
}
float pointLightAttenuationQuadratic(vec4 lightpos, float lightcolorA)
{
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;
#ifdef SUPPORTS_SHADOWMAPS
float shadowIndex = abs(lightcolorA) - 1.0;
attenuation *= shadowmapAttenuation(lightpos, shadowIndex);
#endif
if (lightcolorA >= 0.0) // Sign bit is the attenuated light flag
{
return attenuation;
}
else
{
vec3 lightDirection = normalize(lightpos.xyz - pixelpos.xyz);
vec3 pixelnormal = ApplyNormalMap();
return attenuation * diffuseContribution(lightDirection, pixelnormal);
}
}
vec3 applyLight(vec3 albedo, vec3 ambientLight)
{
vec3 worldpos = pixelpos.xyz;
@ -471,7 +496,7 @@ vec3 applyLight(vec3 albedo, vec3 ambientLight)
vec3 H = normalize(V + L);
//float distance = length(lightpos.xyz - worldpos);
//float attenuation = 1.0 / (distance * distance);
float attenuation = pointLightAttenuation(lightpos, lightcolor.a).x;
float attenuation = pointLightAttenuationQuadratic(lightpos, lightcolor.a);
if (lightspot1.w == 1.0)
attenuation *= spotLightAttenuation(lightpos, lightspot1.xyz, lightspot2.x, lightspot2.y);
@ -506,7 +531,7 @@ vec3 applyLight(vec3 albedo, vec3 ambientLight)
vec3 H = normalize(V + L);
//float distance = length(lightpos.xyz - worldpos);
//float attenuation = 1.0 / (distance * distance);
float attenuation = pointLightAttenuation(lightpos, lightcolor.a).x;
float attenuation = pointLightAttenuationQuadratic(lightpos, lightcolor.a);
if (lightspot1.w == 1.0)
attenuation *= spotLightAttenuation(lightpos, lightspot1.xyz, lightspot2.x, lightspot2.y);