gis_app/library/arcgis/4.30/esri/chunks/EdgeDetect.glsl.js

// All material copyright Esri, All Rights Reserved, unless otherwise specified.
// See https://js.arcgis.com/4.30/esri/copyright.txt for details.
//>>built
define(["exports","../views/3d/webgl-engine/core/shaderLibrary/ScreenSpacePass.glsl","../views/3d/webgl-engine/core/shaderModules/interfaces","../views/3d/webgl-engine/core/shaderModules/ShaderBuilder","../views/3d/webgl-engine/core/shaderModules/Texture2DPassUniform"],function(c,f,b,g,h){function d(){const a=new g.ShaderBuilder;a.include(f.ScreenSpacePass);a.fragment.uniforms.add(new h.Texture2DPassUniform("colorTexture",k=>k.color));a.outputs.add("fragEdges","vec2");a.fragment.code.add(b.glsl`
    float absMax3(vec3 v) {
      vec3 t = abs(v);
      return max(max(t.r, t.g), t.b);
    }

    void main() {
      vec2 resolution = 1.0 / vec2(textureSize(colorTexture, 0));
      vec4 offsets[3];
      offsets[0] = vec4(uv.x - resolution.x, uv.y, uv.x, uv.y + resolution.y);
      offsets[1] = vec4(uv.x + resolution.x, uv.y, uv.x, uv.y - resolution.y);
      offsets[2] = vec4(uv.x - 2.0 * resolution.x, uv.y, uv.x, uv.y + 2.0 * resolution.y);

      // Calculate color deltas:
      vec4 delta;
      vec3 C = texture(colorTexture, uv).rgb;

      vec3 Cleft = texture(colorTexture, offsets[0].xy).rgb;
      delta.x = absMax3(C - Cleft);

      vec3 Ctop = texture(colorTexture, offsets[0].zw).rgb;
      delta.y = absMax3(C - Ctop);

      vec2 edges = step(vec2(${b.glsl.float(e.threshold)}), delta.xy);

      // discard if there is no edge:
      if (dot(edges, vec2(1.0)) == 0.0) {
        discard;
      }

      // Calculate right and bottom deltas:
      vec3 Cright = texture(colorTexture, offsets[1].xy).rgb;
      delta.z = absMax3(C - Cright);

      vec3 Cbottom  = texture(colorTexture, offsets[1].zw).rgb;
      delta.w = absMax3(C - Cbottom);

      // Calculate the maximum delta in the direct neighborhood:
      float maxDelta = max(max(max(delta.x, delta.y), delta.z), delta.w);

      // Calculate left-left and top-top deltas:
      vec3 Cleftleft  = texture(colorTexture, offsets[2].xy).rgb;
      delta.z = absMax3(C - Cleftleft);

      vec3 Ctoptop = texture(colorTexture, offsets[2].zw).rgb;
      delta.w = absMax3(C - Ctoptop);

      // Calculate the final maximum delta:
      maxDelta = max(max(maxDelta, delta.z), delta.w);

      // Local contrast adaptation in action:
      edges *= step(maxDelta, float(${b.glsl.float(e.localConstrastAdaption)}) * delta.xy);

      fragEdges = edges;
    }
  `);return a}const e={threshold:.05,localConstrastAdaption:2},l=Object.freeze(Object.defineProperty({__proto__:null,build:d},Symbol.toStringTag,{value:"Module"}));c.EdgeDetect=l;c.build=d});