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replicate default skybox

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This commit is contained in:
SamGondelman 2018-11-19 19:14:07 -05:00
parent 0fccb4c73c
commit 372f4390e8
1 changed files with 28 additions and 43 deletions

71
interface/resources/shaders/splashSkybox.frag
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@ -1,47 +1,32 @@
const vec3 COLOR = vec3(0x00, 0xD8, 0x02) / vec3(0xFF);
const float CUTOFF = 0.65;
const float NOISE_MULT = 8.0;
const float NOISE_POWER = 1.0;
// Replicate the default skybox texture
float noise4D(vec4 p) {
return fract(sin(dot(p ,vec4(12.9898,78.233,126.7235, 593.2241))) * 43758.5453);
}
float worley4D(vec4 p) {
float r = 3.0;
vec4 f = floor(p);
vec4 x = fract(p);
for(int i = -1; i<=1; i++)
{
for(int j = -1; j<=1; j++)
{
for(int k = -1; k<=1; k++)
{
for (int l = -1; l <= 1; l++) {
vec4 q = vec4(float(i),float(j),float(k), float(l));
vec4 v = q + vec4(noise4D((q+f)*1.11), noise4D((q+f)*1.14), noise4D((q+f)*1.17), noise4D((q+f)*1.20)) - x;
float d = dot(v, v);
r = min(r, d);
}
}
}
}
return sqrt(r);
}
vec3 mainColor(vec3 direction) {
float n = worley4D(vec4(direction * NOISE_MULT, iGlobalTime / 3.0));
n = 1.0 - n;
n = pow(n, NOISE_POWER);
if (n < CUTOFF) {
return vec3(0.0);
}
n = (n - CUTOFF) / (1.0 - CUTOFF);
return COLOR * (1.0 - n);
}
const int NUM_COLORS = 5;
const vec3 WHITISH = vec3(0.471, 0.725, 0.825);
const vec3 GREENISH = vec3(0.157, 0.529, 0.588);
const vec3 COLORS[NUM_COLORS] = vec3[](
GREENISH,
GREENISH,
WHITISH,
WHITISH,
vec3(0.6, 0.275, 0.706) // purple
);
const float PI = 3.14159265359;
const vec3 BLACK = vec3(0.0);
const vec3 SPACE_BLUE = vec3(0.0, 0.118, 0.392);
const float HORIZONTAL_OFFSET = 3.75;
vec3 getSkyboxColor() {
return mainColor(normalize(_normal));
vec2 horizontal = vec2(_normal.x, _normal.z);
horizontal = normalize(horizontal);
float theta = atan(horizontal.y, horizontal.x);
theta = 0.5 * (theta / PI + 1.0);
float index = theta * NUM_COLORS;
index = mod(index + HORIZONTAL_OFFSET, NUM_COLORS);
int index1 = int(index) % NUM_COLORS;
int index2 = (index1 + 1) % NUM_COLORS;
vec3 horizonColor = mix(COLORS[index1], COLORS[index2], index - index1);
horizonColor = mix(horizonColor, SPACE_BLUE, smoothstep(0.0, 0.08, _normal.y));
horizonColor = mix(horizonColor, BLACK, smoothstep(0.04, 0.15, _normal.y));
horizonColor = mix(BLACK, horizonColor, smoothstep(-0.01, 0.0, _normal.y));
return pow(horizonColor, vec3(0.4545));;
}