Add existing to tracked

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

@@ -0,0 +1,57 @@
+uniform vec4 color;
+uniform float cellAlpha;
+uniform vec2 lineCount;
+uniform vec2 lineThickness;
+uniform vec2 lineOffset;
+
+czm_material czm_getMaterial(czm_materialInput materialInput)
+{
+    czm_material material = czm_getDefaultMaterial(materialInput);
+
+    vec2 st = materialInput.st;
+
+    float scaledWidth = fract(lineCount.s * st.s - lineOffset.s);
+    scaledWidth = abs(scaledWidth - floor(scaledWidth + 0.5));
+    float scaledHeight = fract(lineCount.t * st.t - lineOffset.t);
+    scaledHeight = abs(scaledHeight - floor(scaledHeight + 0.5));
+
+    float value;
+
+    // Fuzz Factor - Controls blurriness of lines
+#if (__VERSION__ == 300 || defined(GL_OES_standard_derivatives))
+    const float fuzz = 1.2;
+    vec2 thickness = (lineThickness * czm_pixelRatio) - 1.0;
+
+    // From "3D Engine Design for Virtual Globes" by Cozzi and Ring, Listing 4.13.
+    vec2 dx = abs(dFdx(st));
+    vec2 dy = abs(dFdy(st));
+    vec2 dF = vec2(max(dx.s, dy.s), max(dx.t, dy.t)) * lineCount;
+    value = min(
+        smoothstep(dF.s * thickness.s, dF.s * (fuzz + thickness.s), scaledWidth),
+        smoothstep(dF.t * thickness.t, dF.t * (fuzz + thickness.t), scaledHeight));
+#else
+    // If no derivatives available (IE 10?), revert to view-dependent fuzz
+    const float fuzz = 0.05;
+
+    vec2 range = 0.5 - (lineThickness * 0.05);
+    value = min(
+        1.0 - smoothstep(range.s, range.s + fuzz, scaledWidth),
+        1.0 - smoothstep(range.t, range.t + fuzz, scaledHeight));
+#endif
+
+    // Edges taken from RimLightingMaterial.glsl
+    // See http://www.fundza.com/rman_shaders/surface/fake_rim/fake_rim1.html
+    float dRim = 1.0 - abs(dot(materialInput.normalEC, normalize(materialInput.positionToEyeEC)));
+    float sRim = smoothstep(0.8, 1.0, dRim);
+    value *= (1.0 - sRim);
+
+    vec4 halfColor;
+    halfColor.rgb = color.rgb * 0.5;
+    halfColor.a = color.a * (1.0 - ((1.0 - cellAlpha) * value));
+    halfColor = czm_gammaCorrect(halfColor);
+    material.diffuse = halfColor.rgb;
+    material.emission = halfColor.rgb;
+    material.alpha = halfColor.a;
+
+    return material;
+}