Initial

resources/app/client/pixi/webgl/shaders/lighting/effects/flame.js

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+/**
+ * Alternative torch illumination shader
+ */
+class FlameIlluminationShader extends AdaptiveIlluminationShader {
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PERCEIVED_BRIGHTNESS}
+  
+  void main() {
+    ${this.FRAGMENT_BEGIN}                          
+    ${this.TRANSITION}
+    finalColor *= brightnessPulse;
+    ${this.ADJUSTMENTS}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }`;
+
+  /** @inheritdoc */
+  static defaultUniforms = ({...super.defaultUniforms, brightnessPulse: 1});
+}
+
+/* -------------------------------------------- */
+
+/**
+ * Alternative torch coloration shader
+ */
+class FlameColorationShader extends AdaptiveColorationShader {
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PRNG}
+  ${this.NOISE}
+  ${this.FBMHQ(3)}
+  ${this.PERCEIVED_BRIGHTNESS}
+
+  vec2 scale(in vec2 uv, in float scale) {
+    mat2 scalemat = mat2(scale, 0.0, 0.0, scale);
+    uv -= PIVOT; 
+    uv *= scalemat;
+    uv += PIVOT;
+    return uv;
+  }
+  
+  void main() {
+    ${this.FRAGMENT_BEGIN}
+    vec2 uv = scale(vUvs, 10.0 * ratio);
+    
+    float intens = pow(0.1 * intensity, 2.0);
+    float fratioInner = ratio * (intens * 0.5) - 
+                   (0.005 * 
+                        fbm( vec2( 
+                             uv.x + time * 8.01, 
+                             uv.y + time * 10.72), 1.0));
+    float fratioOuter = ratio - (0.007 * 
+                        fbm( vec2( 
+                             uv.x + time * 7.04, 
+                             uv.y + time * 9.51), 2.0));
+                             
+    float fdist = max(dist - fratioInner * intens, 0.0);
+    
+    float flameDist = smoothstep(clamp(0.97 - fratioInner, 0.0, 1.0),
+                                 clamp(1.03 - fratioInner, 0.0, 1.0),
+                                 1.0 - fdist);
+    float flameDistInner = smoothstep(clamp(0.95 - fratioOuter, 0.0, 1.0),
+                                      clamp(1.05 - fratioOuter, 0.0, 1.0),
+                                      1.0 - fdist);
+                                 
+    vec3 flameColor = color * 8.0;
+    vec3 flameFlickerColor = color * 1.2;
+    
+    finalColor = mix(mix(color, flameFlickerColor, flameDistInner),
+                     flameColor, 
+                     flameDist) * brightnessPulse * colorationAlpha;
+    ${this.COLORATION_TECHNIQUES}
+    ${this.ADJUSTMENTS}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }
+  `;
+
+  /** @inheritdoc */
+  static defaultUniforms = ({ ...super.defaultUniforms, brightnessPulse: 1});
+}