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Minor optimization in pointlight scatter.

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Compute some values before loop.
This commit is contained in:
Deve 2018-12-23 23:16:18 +01:00
parent 9cec9c5cea
commit 14389925fe
1 changed files with 4 additions and 4 deletions
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8
data/shaders/pointlightscatter.frag
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@ -31,15 +31,15 @@ void main()
float stepsize = length(farthestpoint - closestpoint) / 16.; float stepsize = length(farthestpoint - closestpoint) / 16.;
vec3 fog = vec3(0.); vec3 fog = vec3(0.);
vec3 xpos = farthestpoint; vec3 xpos = farthestpoint;
vec3 fog_factor = light_col * density * stepsize * energy * 20.;
vec3 xpos_step = eyedir * stepsize;
for (int i = 0; i < 16; i++) for (int i = 0; i < 16; i++)
{ {
float d = distance(light_pos, xpos); float d = distance(light_pos, xpos);
float l = (16. - float(i)) * stepsize; float l = (16. - float(i)) * stepsize;
float att = energy * 20. / (1. + d * d); fog += fog_factor / (1. + d * d) * max((radius - d) / radius, 0.) * exp(- density * d) * exp(- density * l);
att *= max((radius - d) / radius, 0.); xpos += xpos_step;
fog += density * light_col * att * exp(- density * d) * exp(- density * l) * stepsize;
xpos += stepsize * eyedir;
} }
Fog = vec4(fogcol * fog, 0.); Fog = vec4(fogcol * fog, 0.);