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GL3: Fix missing dynamic lights on floor for grenades/rockets

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Apparently the lightsource for exploding rockets/grenades is very close
to the surface, so the dot-Product between surface-normal and the
vector between the light and the pixel returns 0, basically disabling
the dynamic light for that surface.
As a workaround, move the lightposition (only for that dot product)
a bit above the surface, 32*surfaceNormal looks good.

fixes #386
This commit is contained in:
Daniel Gibson 2019-04-03 19:38:18 +02:00
parent 4f20ac97d1
commit 178fcff36e
1 changed files with 7 additions and 1 deletions
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8
src/client/refresh/gl3/gl3_shaders.c
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@ -488,8 +488,14 @@ static const char* fragmentSrc3Dlm = MULTILINE_STRING(
float distLightToPos = length(lightToPos);
float fact = max(0, intens - distLightToPos - 52);
// move the light source a bit further above the surface
// => helps if the lightsource is so close to the surface (e.g. grenades, rockets)
// that the dot product below would return 0
// (light sources that are below the surface are filtered out by lightFlags)
lightToPos += passNormal*32.0;
// also factor in angle between light and point on surface
fact *= max(0, dot(passNormal, lightToPos/distLightToPos));
fact *= max(0, dot(passNormal, normalize(lightToPos)));
lmTex.rgb += dynLights[i].lightColor.rgb * fact * (1.0/256.0);