@arcgis/core/chunks/ChapmanAtmosphere.glsl.js

ArcGIS Maps SDK for JavaScript: A complete 2D and 3D mapping and data visualization API

/* COPYRIGHT Esri - https://js.arcgis.com/5.0.19/LICENSE.txt */
import{getHeightParameters as e}from"../views/3d/environment/ChapmanApproximation.glsl.js";import{ChapmanRaymarching as r}from"../views/3d/environment/ChapmanRaymarching.glsl.js";import{Gamma as a}from"../views/3d/webgl-engine/core/shaderLibrary/shading/Gamma.glsl.js";import{addMainLightDirection as o}from"../views/3d/webgl-engine/core/shaderLibrary/shading/MainLighting.glsl.js";import{Float2PassUniform as i}from"../views/3d/webgl-engine/core/shaderModules/Float2PassUniform.js";import{Float3BindUniform as t}from"../views/3d/webgl-engine/core/shaderModules/Float3BindUniform.js";import{Float3PassUniform as n}from"../views/3d/webgl-engine/core/shaderModules/Float3PassUniform.js";import{Float4PassUniform as s}from"../views/3d/webgl-engine/core/shaderModules/Float4PassUniform.js";import{FloatPassUniform as l}from"../views/3d/webgl-engine/core/shaderModules/FloatPassUniform.js";import{FloatsPassUniform as d}from"../views/3d/webgl-engine/core/shaderModules/FloatsPassUniform.js";import{glsl as m,If as c}from"../views/3d/webgl-engine/core/shaderModules/glsl.js";import{Texture2DBindUniform as g}from"../views/3d/webgl-engine/core/shaderModules/Texture2DBindUniform.js";import{ScreenSpacePassAtmosphere as u}from"../views/3d/webgl-engine/shaders/ScreenSpacePassAtmosphere.glsl.js";import{SphereIntersect as h}from"../views/3d/webgl-engine/shaders/SphereIntersect.glsl.js";import{ToneMapping as p}from"../views/3d/webgl-engine/shaders/ToneMapping.glsl.js";import{ShaderBuilder as f}from"../views/webgl/ShaderBuilder.js";function w(w){const v=new f;v.include(u);const{reduced:y}=w,{fragment:D}=v;return o(D),D.include(a),D.include(h),D.include(p),D.include(r,!1),D.uniforms.add(new d("heightParameters",5,(r,a)=>e(a,r)),new i("radii",e=>e.radii),new t("cameraPosition",e=>e.camera.eye),new l("innerFadeDistance",e=>e.innerFadeDistance),new s("undergroundColor",e=>e.undergroundColor),new l("altitudeFade",e=>e.altitudeFade)).code.add(m`vec4 applyUndergroundAtmosphere(vec3 rayDir, vec3 lightDirection, vec4 fragColor) {
float rayPlanetDistance = heightParameters[3];
vec2 rayPlanetIntersect = sphereIntersect(cameraPosition, rayDir, rayPlanetDistance);
if (!((rayPlanetIntersect.x <= rayPlanetIntersect.y) && rayPlanetIntersect.y > 0.0)) {
return fragColor;
}
float lightAngle = dot(lightDirection, normalize(cameraPosition + rayDir * max(0.0, rayPlanetIntersect.x)));
float surfaceShade = max(0.0, (smoothstep(-1.0, 0.8, 2.0 * lightAngle)));
vec4 color = vec4(undergroundColor.rgb * surfaceShade, undergroundColor.a * (1.0 - altitudeFade));
float relDist = (rayPlanetIntersect.y - max(0.0, rayPlanetIntersect.x)) / innerFadeDistance;
if (relDist > 1.0) {
return color;
}
return mix(fragColor, color, smoothstep(0.0, 1.0, relDist * relDist));
}
float getGlow(float dist, float radius, float intensity) {
return pow(radius / max(dist, 1e-6), intensity);
}
vec3 getSun(vec3 rayDir, vec3 lightDir){
float scaleFract = (length(cameraPosition) - radii[0]) / scaleHeight;
float sunOpticalDepth = getOpticalDepth(cameraPosition, rayDir, max(scaleFract, 0.0));
vec3 sunTransmittance = exp(-(mix(betaCombined, betaRayleigh, 0.5)) * max(0.0, sunOpticalDepth));
float mu = clamp(dot(rayDir, lightDir), 0.0, 1.0);
float sunDisc = 256.0 * smoothstep(0.0, 128.0, clamp(getGlow(1.0 - mu, 3e-5, 3.0), 0.0, 128.0));
return normalize(sunTransmittance) * sunDisc;
}`),D.uniforms.add(new n("backgroundColor",e=>e.backgroundColor),new g("depthTexture",e=>e.mainDepth)).main.add(m`
    vec3 rayDir = normalize(worldRay);
    ${c(!y,m`
        float depthSample = texture(depthTexture, uv).r;
        if (depthSample != 1.0) {
          fragColor = vec4(0.0);
          return;
        }`)}

    vec3 color = linearizeGamma(backgroundColor) +
                 raymarchAtmosphere(rayDir, mainLightDirection, -1.0) +
                 getSun(rayDir, mainLightDirection);
    float alpha = smoothstep(0.0, mix(0.15, 0.01, heightParameters[2]), length(color));

    color = tonemapACES(color);
    fragColor = delinearizeGamma(vec4(color, alpha));
    fragColor = applyUndergroundAtmosphere(rayDir, mainLightDirection, fragColor);
  `),v}const v=Object.freeze(Object.defineProperty({__proto__:null,build:w},Symbol.toStringTag,{value:"Module"}));export{v as C,w as b};