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resources/app/client/pixi/webgl/shaders/vision/effects/wave.js

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+/**
+ * Shader specialized in wave like senses (tremorsenses)
+ */
+class WaveBackgroundVisionShader extends BackgroundVisionShader {
+
+  /** @inheritdoc */
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.WAVE()}
+  ${this.PERCEIVED_BRIGHTNESS}
+  
+  void main() {
+    ${this.FRAGMENT_BEGIN}    
+    // Normalize vUvs and compute base time
+    vec2 uvs = (2.0 * vUvs) - 1.0;
+    float t = time * -8.0;
+    
+    // Rotate uvs
+    float sinX = sin(t * 0.02);
+    float cosX = cos(t * 0.02);
+    mat2 rotationMatrix = mat2( cosX, -sinX, sinX, cosX);
+    vec2 ruv = ((vUvs - 0.5) * rotationMatrix) + 0.5;
+    
+    // Produce 4 arms smoothed to the edges
+    float angle = atan(ruv.x * 2.0 - 1.0, ruv.y * 2.0 - 1.0) * INVTWOPI;
+    float beam = fract(angle * 4.0);
+    beam = smoothstep(0.3, 1.0, max(beam, 1.0 - beam));
+    
+    // Construct final color
+    vec3 grey = vec3(perceivedBrightness(baseColor.rgb));
+    finalColor = mix(baseColor.rgb, grey * 0.5, sqrt(beam)) * mix(vec3(1.0), colorTint, 0.3);
+    ${this.ADJUSTMENTS}
+    ${this.BACKGROUND_TECHNIQUES}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }`;
+
+  /** @inheritdoc */
+  static defaultUniforms = ({...super.defaultUniforms, colorTint: [0.8, 0.1, 0.8]});
+
+  /** @inheritdoc */
+  get isRequired() {
+    return true;
+  }
+}
+
+/* -------------------------------------------- */
+
+/**
+ * The wave vision shader, used to create waves emanations (ex: tremorsense)
+ */
+class WaveColorationVisionShader extends ColorationVisionShader {
+
+  /** @inheritdoc */
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.WAVE()}
+  ${this.PERCEIVED_BRIGHTNESS}
+    
+  void main() {
+    ${this.FRAGMENT_BEGIN}
+    // Normalize vUvs and compute base time
+    vec2 uvs = (2.0 * vUvs) - 1.0;
+    float t = time * -8.0;
+    
+    // Rotate uvs
+    float sinX = sin(t * 0.02);
+    float cosX = cos(t * 0.02);
+    mat2 rotationMatrix = mat2( cosX, -sinX, sinX, cosX);
+    vec2 ruv = ((vUvs - 0.5) * rotationMatrix) + 0.5;
+    
+    // Prepare distance from 4 corners
+    float dst[4];
+    dst[0] = distance(vec2(0.0), ruv);
+    dst[1] = distance(vec2(1.0), ruv);
+    dst[2] = distance(vec2(1.0,0.0), ruv);
+    dst[3] = distance(vec2(0.0,1.0), ruv);
+    
+    // Produce 4 arms smoothed to the edges
+    float angle = atan(ruv.x * 2.0 - 1.0, ruv.y * 2.0 - 1.0) * INVTWOPI;
+    float beam = fract(angle * 4.0);
+    beam = smoothstep(0.3, 1.0, max(beam, 1.0 - beam));
+    
+    // Computing the 4 corner waves
+    float multiWaves = 0.0;
+    for ( int i = 0; i <= 3 ; i++) {
+      multiWaves += smoothstep(0.6, 1.0, max(multiWaves, wcos(-10.0, 1.30 - dst[i], dst[i] * 120.0, t)));
+    }
+    // Computing the central wave
+    multiWaves += smoothstep(0.6, 1.0, max(multiWaves, wcos(-10.0, 1.35 - dist, dist * 120.0, -t)));
+        
+    // Construct final color
+    finalColor = vec3(mix(multiWaves, 0.0, sqrt(beam))) * colorEffect;
+    ${this.COLORATION_TECHNIQUES}
+    ${this.ADJUSTMENTS}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }`;
+
+  /** @inheritdoc */
+  static defaultUniforms = ({...super.defaultUniforms, colorEffect: [0.8, 0.1, 0.8]});
+
+  /** @inheritdoc */
+  get isRequired() {
+    return true;
+  }
+}