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resources/app/client/pixi/webgl/shaders/region/base.js

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+/**
+ * The shader used by {@link RegionMesh}.
+ */
+class RegionShader extends AbstractBaseShader {
+
+  /** @override */
+  static vertexShader = `
+    precision ${PIXI.settings.PRECISION_VERTEX} float;
+
+    attribute vec2 aVertexPosition;
+
+    uniform mat3 translationMatrix;
+    uniform mat3 projectionMatrix;
+    uniform vec2 canvasDimensions;
+    uniform vec4 sceneDimensions;
+    uniform vec2 screenDimensions;
+
+    varying vec2 vCanvasCoord; // normalized canvas coordinates
+    varying vec2 vSceneCoord; // normalized scene coordinates
+    varying vec2 vScreenCoord; // normalized screen coordinates
+
+    void main() {
+      vec2 pixelCoord = aVertexPosition;
+      vCanvasCoord = pixelCoord / canvasDimensions;
+      vSceneCoord = (pixelCoord - sceneDimensions.xy) / sceneDimensions.zw;
+      vec3 tPos = translationMatrix * vec3(aVertexPosition, 1.0);
+      vScreenCoord = tPos.xy / screenDimensions;
+      gl_Position = vec4((projectionMatrix * tPos).xy, 0.0, 1.0);
+    }
+  `;
+
+  /** @override */
+  static fragmentShader = `
+    precision ${PIXI.settings.PRECISION_FRAGMENT} float;
+
+    uniform vec4 tintAlpha;
+
+    void main() {
+      gl_FragColor = tintAlpha;
+    }
+  `;
+
+  /* ---------------------------------------- */
+
+  /** @override */
+  static defaultUniforms = {
+    canvasDimensions: [1, 1],
+    sceneDimensions: [0, 0, 1, 1],
+    screenDimensions: [1, 1],
+    tintAlpha: [1, 1, 1, 1]
+  };
+
+  /* ---------------------------------------- */
+
+  /** @override */
+  _preRender(mesh, renderer) {
+    const uniforms = this.uniforms;
+    uniforms.tintAlpha = mesh._cachedTint;
+    const dimensions = canvas.dimensions;
+    uniforms.canvasDimensions[0] = dimensions.width;
+    uniforms.canvasDimensions[1] = dimensions.height;
+    uniforms.sceneDimensions = dimensions.sceneRect;
+    uniforms.screenDimensions = canvas.screenDimensions;
+  }
+}