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Use DDA for rain rendering

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This commit is contained in:
Joshua Barretto 2022-07-08 14:47:43 +01:00
parent 7bd4686187
commit eae917ee8f
1 changed files with 42 additions and 5 deletions
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37
assets/voxygen/shaders/clouds-frag.glsl
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@ -82,6 +82,43 @@ void main() {
#if (CLOUD_MODE == CLOUD_MODE_NONE)
color.rgb = apply_point_glow(cam_pos.xyz + focus_off.xyz, dir, dist, color.rgb);
#elif (0 == 0)
if (medium.x == MEDIUM_AIR && rain_density > 0.0) {
vec3 cam_wpos = cam_pos.xyz + focus_off.xyz;
vec3 adjusted_dir = (vec4(dir, 0) * rain_dir_mat).xyz;
vec2 dir2d = adjusted_dir.xy;
vec3 rpos = vec3(0);
float t = 0.0;
for (int i = 0; i < 10; i ++) {//t * (length(dir2d) + 0.25) < 30.0) {
const float PLANCK = 0.01;
float scale = min(pow(2, ceil(t / 2.0)), 32);
vec2 deltas = (step(vec2(0), dir2d) - fract(rpos.xy / scale)) / dir2d;
t += max(min(deltas.x, deltas.y) * scale, PLANCK);
rpos = cam_wpos + adjusted_dir * t;
vec3 wpos = cam_pos.xyz + focus_off.xyz + dir * t;
vec2 diff = abs(round(rpos.xy) - rpos.xy);
vec3 wall_pos = vec3((diff.x > diff.y) ? rpos.xy : rpos.yx, rpos.z + integrated_rain_vel * 0.5);
wall_pos.xz *= vec2(4, 0.3);
wall_pos.z += hash(fract(vec4(floor(wall_pos.xy + vec2(0, 0.5)), 0, 0) * 0.1));
if (abs(hash(vec4(floor(wall_pos.xyz), 0))) > rain_density) {
continue;
}
if (rain_occlusion_at(wpos - focus_off.xyz) > 0.0 && t > 1 && t < dist) {
if (length((fract(wall_pos.xz) - 0.5)) < 0.1) {
float drop_size = 0.001;
float alpha = sign(max(1 - length(rpos / drop_size * 0.1), 0));
float light = sqrt(dot(color.rgb, vec3(1))) + (get_sun_brightness() + get_moon_brightness()) * 0.01;
color.rgb = mix(color.rgb, vec3(0.2, 0.3, 0.5) * light, 0.9);
/* color.rgb = mix(color.rgb, vec3(0.5, 0.5, 1), 0.5); */
}
}
}
}
#else
vec3 old_color = color.rgb;