Initial

resources/app/client/pixi/webgl/shaders/vision/background-vision.js

@@ -0,0 +1,91 @@
+/**
+ * The default background shader used for vision sources
+ */
+class BackgroundVisionShader extends AdaptiveVisionShader {
+
+  /** @inheritdoc */
+  static FRAGMENT_END = `
+  finalColor *= colorTint;
+  if ( linkedToDarknessLevel ) finalColor = mix(baseColor.rgb, finalColor, computedDarknessLevel);
+  ${super.FRAGMENT_END}
+  `;
+
+  /**
+   * Adjust the intensity according to the difference between the pixel darkness level and the scene darkness level.
+   * Used to see the difference of intensity when computing the background shader which is completeley overlapping
+   * The surface texture.
+   * @type {string}
+   */
+  static ADJUST_INTENSITY = `
+  float darknessLevelDifference = clamp(computedDarknessLevel - darknessLevel, 0.0, 1.0);
+  finalColor = mix(finalColor, finalColor * 0.5, darknessLevelDifference);
+  `;
+
+  /** @inheritdoc */
+  static ADJUSTMENTS = `
+  ${this.ADJUST_INTENSITY}
+  ${super.ADJUSTMENTS}
+  `;
+
+  /**
+   * Memory allocations for the Adaptive Background Shader
+   * @type {string}
+   */
+  static SHADER_HEADER = `
+  ${this.FRAGMENT_UNIFORMS}
+  ${this.VERTEX_FRAGMENT_VARYINGS}
+  ${this.FRAGMENT_FUNCTIONS}
+  ${this.CONSTANTS}`;
+
+  /** @inheritdoc */
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PERCEIVED_BRIGHTNESS}
+
+  void main() {
+    ${this.FRAGMENT_BEGIN}
+    ${this.ADJUSTMENTS}
+    ${this.BACKGROUND_TECHNIQUES}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }`;
+
+  /** @inheritdoc */
+  static defaultUniforms = {
+    technique: 0,
+    saturation: 0,
+    contrast: 0,
+    attenuation: 0.10,
+    exposure: 0,
+    darknessLevel: 0,
+    colorVision: [1, 1, 1],
+    colorTint: [1, 1, 1],
+    colorBackground: [1, 1, 1],
+    screenDimensions: [1, 1],
+    time: 0,
+    useSampler: true,
+    linkedToDarknessLevel: true,
+    primaryTexture: null,
+    depthTexture: null,
+    darknessLevelTexture: null,
+    depthElevation: 1,
+    ambientBrightest: [1, 1, 1],
+    ambientDarkness: [0, 0, 0],
+    ambientDaylight: [1, 1, 1],
+    weights: [0, 0, 0, 0],
+    dimLevelCorrection: 1,
+    brightLevelCorrection: 2,
+    globalLight: false,
+    globalLightThresholds: [0, 0]
+  };
+
+  /**
+   * Flag whether the background shader is currently required.
+   * If key uniforms are at their default values, we don't need to render the background container.
+   * @type {boolean}
+   */
+  get isRequired() {
+    const keys = ["contrast", "saturation", "colorTint", "colorVision"];
+    return keys.some(k => this.uniforms[k] !== this.constructor.defaultUniforms[k]);
+  }
+}