51 lines
1.3 KiB
GLSL
51 lines
1.3 KiB
GLSL
vec3 nvec3(vec4 pos) {
|
|
return pos.xyz/pos.w;
|
|
}
|
|
|
|
vec4 nvec4(vec3 pos) {
|
|
return vec4(pos.xyz, 1.0);
|
|
}
|
|
|
|
float cdist(vec2 coord) {
|
|
return max(abs(coord.s-0.5) * 1.95, abs(coord.t-0.5) * 2.0);
|
|
}
|
|
|
|
vec4 Raytrace(sampler2D depthtex, vec3 viewPos, vec3 normal, float dither) {
|
|
vec3 pos = vec3(0.0);
|
|
float dist = 0.0;
|
|
|
|
#if AA > 1
|
|
dither = fract(dither + frameTimeCounter);
|
|
#endif
|
|
|
|
vec3 start = viewPos;
|
|
vec3 vector = reflect(normalize(viewPos), normalize(normal));
|
|
viewPos += vector;
|
|
vec3 tvector = vector;
|
|
|
|
int sr = 0;
|
|
|
|
for(int i = 0; i < 30; i++) {
|
|
pos = nvec3(gbufferProjection * nvec4(viewPos)) * 0.5 + 0.5;
|
|
if (pos.x < -0.05 || pos.x > 1.05 || pos.y < -0.05 || pos.y > 1.05) break;
|
|
|
|
vec3 rfragpos = vec3(pos.xy, texture2D(depthtex,pos.xy).r);
|
|
rfragpos = nvec3(gbufferProjectionInverse * nvec4(rfragpos * 2.0 - 1.0));
|
|
dist = length(start - rfragpos);
|
|
|
|
float err = length(viewPos - rfragpos);
|
|
float lVector = length(vector);
|
|
if (lVector > 1.0) lVector = pow(lVector, 1.14);
|
|
if (err < lVector) {
|
|
sr++;
|
|
if(sr >= 6) break;
|
|
tvector -= vector;
|
|
vector *= 0.1;
|
|
}
|
|
vector *= 2.0;
|
|
tvector += vector * (dither * 0.05 + 1.0);
|
|
viewPos = start + tvector;
|
|
}
|
|
|
|
return vec4(pos, dist);
|
|
} |