29 lines
774 B
GLSL
29 lines
774 B
GLSL
#include <common>
|
|
|
|
uniform vec3 lightDirection;
|
|
uniform float g;
|
|
|
|
varying vec3 v3Direction;
|
|
varying vec3 c0;
|
|
varying vec3 c1;
|
|
|
|
// Calculates the Mie phase function
|
|
float getMiePhase(float fCos, float fCos2, float g, float g2){
|
|
return 1.5 * ((1.0 - g2) / (2.0 + g2)) * (1.0 + fCos2) / pow(1.0 + g2 - 2.0 * g * fCos, 1.5);
|
|
}
|
|
|
|
// Calculates the Rayleigh phase function
|
|
float getRayleighPhase(float fCos2) {
|
|
// return 0.75 + 0.75 * fCos2;
|
|
return 0.75 * (2.0 + 0.5 * fCos2);
|
|
}
|
|
|
|
void main (void) {
|
|
float fCos = dot(lightDirection, v3Direction) / length(v3Direction);
|
|
float fCos2 = fCos * fCos;
|
|
vec3 color = getRayleighPhase(fCos2) * c0 +
|
|
getMiePhase(fCos, fCos2, g, pow(g, 2.0)) * c1;
|
|
gl_FragColor = vec4(color, 1.0);
|
|
gl_FragColor.a = gl_FragColor.b;
|
|
}
|