@pixi/core/lib/projection/ProjectionSystem.mjs

Core PixiJS

import { ExtensionType, extensions } from '@pixi/extensions';
import { Matrix } from '@pixi/math';

class ProjectionSystem {
  constructor(renderer) {
    this.renderer = renderer;
    this.destinationFrame = null;
    this.sourceFrame = null;
    this.defaultFrame = null;
    this.projectionMatrix = new Matrix();
    this.transform = null;
  }
  update(destinationFrame, sourceFrame, resolution, root) {
    this.destinationFrame = destinationFrame || this.destinationFrame || this.defaultFrame;
    this.sourceFrame = sourceFrame || this.sourceFrame || destinationFrame;
    this.calculateProjection(this.destinationFrame, this.sourceFrame, resolution, root);
    if (this.transform) {
      this.projectionMatrix.append(this.transform);
    }
    const renderer = this.renderer;
    renderer.globalUniforms.uniforms.projectionMatrix = this.projectionMatrix;
    renderer.globalUniforms.update();
    if (renderer.shader.shader) {
      renderer.shader.syncUniformGroup(renderer.shader.shader.uniforms.globals);
    }
  }
  calculateProjection(_destinationFrame, sourceFrame, _resolution, root) {
    const pm = this.projectionMatrix;
    const sign = !root ? 1 : -1;
    pm.identity();
    pm.a = 1 / sourceFrame.width * 2;
    pm.d = sign * (1 / sourceFrame.height * 2);
    pm.tx = -1 - sourceFrame.x * pm.a;
    pm.ty = -sign - sourceFrame.y * pm.d;
  }
  setTransform(_matrix) {
  }
  destroy() {
    this.renderer = null;
  }
}
ProjectionSystem.extension = {
  type: ExtensionType.RendererSystem,
  name: "projection"
};
extensions.add(ProjectionSystem);

export { ProjectionSystem };
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