Add existing to tracked

node_modules/@cesium/engine/Source/Shaders/Materials/PolylineDashMaterial.glsl

@@ -0,0 +1,39 @@
+uniform vec4 color;
+uniform vec4 gapColor;
+uniform float dashLength;
+uniform float dashPattern;
+in float v_polylineAngle;
+
+const float maskLength = 16.0;
+
+mat2 rotate(float rad) {
+    float c = cos(rad);
+    float s = sin(rad);
+    return mat2(
+        c, s,
+        -s, c
+    );
+}
+
+czm_material czm_getMaterial(czm_materialInput materialInput)
+{
+    czm_material material = czm_getDefaultMaterial(materialInput);
+
+    vec2 pos = rotate(v_polylineAngle) * gl_FragCoord.xy;
+
+    // Get the relative position within the dash from 0 to 1
+    float dashPosition = fract(pos.x / (dashLength * czm_pixelRatio));
+    // Figure out the mask index.
+    float maskIndex = floor(dashPosition * maskLength);
+    // Test the bit mask.
+    float maskTest = floor(dashPattern / pow(2.0, maskIndex));
+    vec4 fragColor = (mod(maskTest, 2.0) < 1.0) ? gapColor : color;
+    if (fragColor.a < 0.005) {   // matches 0/255 and 1/255
+        discard;
+    }
+
+    fragColor = czm_gammaCorrect(fragColor);
+    material.emission = fragColor.rgb;
+    material.alpha = fragColor.a;
+    return material;
+}