luboslenco
87 lines
1.9 KiB
GLSL
87 lines
1.9 KiB
GLSL
#version 450
|
|
|
|
uniform sampler2D gbufferD;
|
|
uniform sampler2D gbuffer0;
|
|
uniform mat4 P;
|
|
uniform mat3 V3;
|
|
uniform vec2 camera_proj;
|
|
|
|
#include "std/math.glsl"
|
|
#include "std/gbuffer.glsl"
|
|
|
|
in vec3 view_ray;
|
|
in vec2 tex_coord;
|
|
out float frag_color;
|
|
|
|
const int max_steps = 32;
|
|
const float ray_step = 0.001;
|
|
|
|
vec3 hit_coord;
|
|
vec2 coord;
|
|
float depth;
|
|
vec3 vpos;
|
|
|
|
vec2 get_projected_coord(vec3 hit_coord) {
|
|
vec4 projected_coord = mul(vec4(hit_coord, 1.0), P);
|
|
projected_coord.xy /= projected_coord.w;
|
|
projected_coord.xy = projected_coord.xy * 0.5 + 0.5;
|
|
#ifdef GLSL
|
|
#else
|
|
projected_coord.y = 1.0 - projected_coord.y;
|
|
#endif
|
|
return projected_coord.xy;
|
|
}
|
|
|
|
float get_delta_depth(vec3 hit_coord) {
|
|
coord = get_projected_coord(hit_coord);
|
|
depth = textureLod(gbufferD, coord, 0.0).r * 2.0 - 1.0;
|
|
vec3 p = get_pos_view(view_ray, depth, camera_proj);
|
|
return p.z - hit_coord.z;
|
|
}
|
|
|
|
void ray_cast(vec3 dir) {
|
|
hit_coord = vpos;
|
|
dir *= ray_step;
|
|
float dist = 0.15;
|
|
for (int i = 0; i < max_steps; i++) {
|
|
hit_coord += dir;
|
|
float delta = get_delta_depth(hit_coord);
|
|
if (delta > 0.0 && delta < 0.2) {
|
|
dist = distance(vpos, hit_coord);
|
|
break;
|
|
}
|
|
}
|
|
frag_color += dist;
|
|
}
|
|
|
|
vec3 tangent(const vec3 n) {
|
|
vec3 t1 = cross(n, vec3(0, 0, 1));
|
|
vec3 t2 = cross(n, vec3(0, 1, 0));
|
|
if (length(t1) > length(t2)) return normalize(t1);
|
|
else return normalize(t2);
|
|
}
|
|
|
|
void main() {
|
|
frag_color = 0;
|
|
vec4 g0 = textureLod(gbuffer0, tex_coord, 0.0);
|
|
float d = textureLod(gbufferD, tex_coord, 0.0).r * 2.0 - 1.0;
|
|
|
|
vec2 enc = g0.rg;
|
|
vec3 n;
|
|
n.z = 1.0 - abs(enc.x) - abs(enc.y);
|
|
n.xy = n.z >= 0.0 ? enc.xy : octahedron_wrap(enc.xy);
|
|
n = normalize(mul(n, V3));
|
|
|
|
vpos = get_pos_view(view_ray, d, camera_proj);
|
|
|
|
ray_cast(n);
|
|
vec3 o1 = normalize(tangent(n));
|
|
vec3 o2 = (cross(o1, n));
|
|
vec3 c1 = 0.5f * (o1 + o2);
|
|
vec3 c2 = 0.5f * (o1 - o2);
|
|
ray_cast(mix(n, o1, 0.5));
|
|
ray_cast(mix(n, o2, 0.5));
|
|
ray_cast(mix(n, -c1, 0.5));
|
|
ray_cast(mix(n, -c2, 0.5));
|
|
}
|