51 lines
1.2 KiB
GLSL
51 lines
1.2 KiB
GLSL
!!permu FOG
|
|
!!samps base=0, cloud=1
|
|
!!cvardf r_skyfog=0.5
|
|
#include "sys/fog.h"
|
|
|
|
//regular sky shader for scrolling q1 skies
|
|
//the sky surfaces are thrown through this as-is.
|
|
|
|
#ifdef VERTEX_SHADER
|
|
varying vec3 pos;
|
|
void main ()
|
|
{
|
|
pos = v_position.xyz;
|
|
gl_Position = ftetransform();
|
|
}
|
|
#endif
|
|
#ifdef FRAGMENT_SHADER
|
|
uniform float e_time;
|
|
uniform vec3 e_eyepos;
|
|
varying vec3 pos;
|
|
void main ()
|
|
{
|
|
vec2 tccoord;
|
|
vec3 dir = pos - e_eyepos;
|
|
|
|
#ifdef EQUI
|
|
#define PI 3.1415926535897932384626433832795
|
|
dir = normalize(dir);
|
|
tccoord.x = atan(dir.y,-dir.x) / (PI*2.0);
|
|
tccoord.y = acos(dir.z) / PI;
|
|
|
|
vec3 sky = vec3(texture2D(s_base, tccoord));
|
|
#else
|
|
|
|
dir.z *= 3.0;
|
|
dir.xy /= 0.5*length(dir);
|
|
tccoord = (dir.xy + e_time*0.03125);
|
|
vec3 sky = vec3(texture2D(s_base, tccoord));
|
|
tccoord = (dir.xy + e_time*0.0625);
|
|
vec4 clouds = texture2D(s_cloud, tccoord);
|
|
sky = (sky.rgb*(1.0-clouds.a)) + (clouds.a*clouds.rgb);
|
|
#endif
|
|
|
|
#ifdef FOG
|
|
sky.rgb = mix(sky.rgb, w_fogcolour, float(r_skyfog)*w_fogalpha); //flat fog ignoring actual geometry
|
|
//sky = fog3(sky); //fog according to actual geometry
|
|
#endif
|
|
gl_FragColor = vec4(sky, 1.0);
|
|
}
|
|
#endif
|