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OpenGL2: Speed up fog shader slightly.

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This commit is contained in:
SmileTheory 2013-09-16 23:20:44 -07:00
parent a408a2bdae
commit 5985cca2e6
2 changed files with 13 additions and 19 deletions
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17
code/renderergl2/glsl/fogpass_vp.glsl
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@ -85,16 +85,13 @@ float CalcFog(vec4 position)
float s = dot(position, u_FogDistance) * 8.0;
float t = dot(position, u_FogDepth);
if (t < 1.0)
{
t = step(step(0.0, -u_FogEyeT), t);
}
else
{
t /= t - min(u_FogEyeT, 0.0);
}
return s * t;
bool eyeOutside = u_FogEyeT < 0.0;
float t2 = float(t >= float(eyeOutside));
if (eyeOutside)
t2 *= t / (t - u_FogEyeT);
return s * t2;
}
void main()

15
code/renderergl2/glsl/generic_vp.glsl
View file

@ -194,16 +194,13 @@ float CalcFog(vec4 position)
float s = dot(position, u_FogDistance) * 8.0;
float t = dot(position, u_FogDepth);
if (t < 1.0)
{
t = step(step(0.0, -u_FogEyeT), t);
}
else
{
t /= t - min(u_FogEyeT, 0.0);
}
bool eyeOutside = u_FogEyeT < 0.0;
float t2 = float(t >= float(eyeOutside));
return s * t;
if (eyeOutside)
t2 *= t / (t - u_FogEyeT);
return s * t2;
}
#endif