Initial

resources/app/client/pixi/webgl/shaders/lighting/effects/smoke-patch.js

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+/**
+ * A patch of smoke
+ */
+class SmokePatchColorationShader extends AdaptiveColorationShader {
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PERCEIVED_BRIGHTNESS}
+  ${this.PRNG}
+  ${this.NOISE}
+  ${this.FBMHQ(3)}
+  
+  vec2 transform(in vec2 uv, in float dist) {
+    float t = time * 0.1;
+    float cost = cos(t);
+    float sint = sin(t);
+
+    mat2 rotmat = mat2(cost, -sint, sint, cost);
+    mat2 scalemat = mat2(10.0, uv.x, uv.y, 10.0);
+    uv -= PIVOT;
+    uv *= (rotmat * scalemat);
+    uv += PIVOT;
+    return uv;
+  }
+
+  float smokefading(in float dist) {
+    float t = time * 0.4;
+    vec2 uv = transform(vUvs, dist);
+    return pow(1.0 - dist, 
+      mix(fbm(uv, 1.0 + intensity * 0.4), 
+        max(fbm(uv + t, 1.0),
+            fbm(uv - t, 1.0)), 
+          pow(dist, intensity * 0.5)));
+  }
+
+  void main() {
+    ${this.FRAGMENT_BEGIN}
+    finalColor = color * smokefading(dist) * colorationAlpha;
+    ${this.COLORATION_TECHNIQUES}
+    ${this.ADJUSTMENTS}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }
+  `;
+}
+
+/* -------------------------------------------- */
+
+/**
+ * A patch of smoke
+ */
+class SmokePatchIlluminationShader extends AdaptiveIlluminationShader {
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PERCEIVED_BRIGHTNESS}
+  ${this.PRNG}
+  ${this.NOISE}
+  ${this.FBMHQ(3)}
+
+  vec2 transform(in vec2 uv, in float dist) {
+    float t = time * 0.1;
+    float cost = cos(t);
+    float sint = sin(t);
+
+    mat2 rotmat = mat2(cost, -sint, sint, cost);
+    mat2 scalemat = mat2(10.0, uv.x, uv.y, 10.0);
+    uv -= PIVOT;
+    uv *= (rotmat * scalemat);
+    uv += PIVOT;
+    return uv;
+  }
+  
+  float smokefading(in float dist) {
+    float t = time * 0.4;
+    vec2 uv = transform(vUvs, dist);
+    return pow(1.0 - dist,
+      mix(fbm(uv, 1.0 + intensity * 0.4),
+        max(fbm(uv + t, 1.0),
+            fbm(uv - t, 1.0)),
+        pow(dist, intensity * 0.5)));
+  }
+
+  void main() {
+    ${this.FRAGMENT_BEGIN}                          
+    ${this.TRANSITION}
+    finalColor *= smokefading(dist);
+    ${this.ADJUSTMENTS}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }
+  `;
+}