59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
|
#ifdef FRAGMENT_SHADER
|
||
|
|
#define w_fogcolour w_fogcolours.rgb
|
||
|
|
#define w_fogalpha w_fogcolours.a
|
||
|
|
|
||
|
|
vec3 fog3(in vec3 regularcolour)
|
||
|
|
{
|
||
|
|
if (!FOG)
|
||
|
|
return regularcolour;
|
||
|
|
float z = w_fogdensity * gl_FragCoord.z / gl_FragCoord.w;
|
||
|
|
z = max(0.0,z-w_fogdepthbias);
|
||
|
|
if (cvar_r_fog_exp2)
|
||
|
|
z *= z;
|
||
|
|
float fac = exp2(-(z * 1.442695));
|
||
|
|
fac = (1.0-w_fogalpha) + (clamp(fac, 0.0, 1.0)*w_fogalpha);
|
||
|
|
return mix(w_fogcolour, regularcolour, fac);
|
||
|
|
}
|
||
|
|
vec3 fog3additive(in vec3 regularcolour)
|
||
|
|
{
|
||
|
|
if (!FOG)
|
||
|
|
return regularcolour;
|
||
|
|
float z = w_fogdensity * gl_FragCoord.z / gl_FragCoord.w;
|
||
|
|
z = max(0.0,z-w_fogdepthbias);
|
||
|
|
if (cvar_r_fog_exp2)
|
||
|
|
z *= z;
|
||
|
|
float fac = exp2(-(z * 1.442695));
|
||
|
|
fac = (1.0-w_fogalpha) + (clamp(fac, 0.0, 1.0)*w_fogalpha);
|
||
|
|
return regularcolour * fac;
|
||
|
|
}
|
||
|
|
vec4 fog4(in vec4 regularcolour)
|
||
|
|
{
|
||
|
|
if (!FOG)
|
||
|
|
return regularcolour;
|
||
|
|
return vec4(fog3(regularcolour.rgb), 1.0) * regularcolour.a;
|
||
|
|
}
|
||
|
|
vec4 fog4additive(in vec4 regularcolour)
|
||
|
|
{
|
||
|
|
if (!FOG)
|
||
|
|
return regularcolour;
|
||
|
|
float z = w_fogdensity * gl_FragCoord.z / gl_FragCoord.w;
|
||
|
|
z = max(0.0,z-w_fogdepthbias);
|
||
|
|
if (cvar_r_fog_exp2)
|
||
|
|
z *= z;
|
||
|
|
float fac = exp2(-(z * 1.442695));
|
||
|
|
fac = (1.0-w_fogalpha) + (clamp(fac, 0.0, 1.0)*w_fogalpha);
|
||
|
|
return regularcolour * vec4(fac, fac, fac, 1.0);
|
||
|
|
}
|
||
|
|
vec4 fog4blend(in vec4 regularcolour)
|
||
|
|
{
|
||
|
|
if (!FOG)
|
||
|
|
return regularcolour;
|
||
|
|
float z = w_fogdensity * gl_FragCoord.z / gl_FragCoord.w;
|
||
|
|
z = max(0.0,z-w_fogdepthbias);
|
||
|
|
if (cvar_r_fog_exp2)
|
||
|
|
z *= z;
|
||
|
|
float fac = exp2(-(z * 1.442695));
|
||
|
|
fac = (1.0-w_fogalpha) + (clamp(fac, 0.0, 1.0)*w_fogalpha);
|
||
|
|
return regularcolour * vec4(1.0, 1.0, 1.0, fac);
|
||
|
|
}
|
||
|
|
#endif
|