@pixi/core/lib/transformFeedback/TransformFeedbackSystem.js

Core PixiJS

"use strict";
var extensions = require("@pixi/extensions");
class TransformFeedbackSystem {
  /**
   * @param renderer - The renderer this System works for.
   */
  constructor(renderer) {
    this.renderer = renderer;
  }
  /** Sets up the renderer context and necessary buffers. */
  contextChange() {
    this.gl = this.renderer.gl, this.CONTEXT_UID = this.renderer.CONTEXT_UID;
  }
  /**
   * Bind TransformFeedback and buffers
   * @param transformFeedback - TransformFeedback to bind
   */
  bind(transformFeedback) {
    const { gl, CONTEXT_UID } = this, glTransformFeedback = transformFeedback._glTransformFeedbacks[CONTEXT_UID] || this.createGLTransformFeedback(transformFeedback);
    gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, glTransformFeedback);
  }
  /** Unbind TransformFeedback */
  unbind() {
    const { gl } = this;
    gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
  }
  /**
   * Begin TransformFeedback
   * @param drawMode - DrawMode for TransformFeedback
   * @param shader - A Shader used by TransformFeedback. Current bound shader will be used if not provided.
   */
  beginTransformFeedback(drawMode, shader) {
    const { gl, renderer } = this;
    shader && renderer.shader.bind(shader), gl.beginTransformFeedback(drawMode);
  }
  /** End TransformFeedback */
  endTransformFeedback() {
    const { gl } = this;
    gl.endTransformFeedback();
  }
  /**
   * Create TransformFeedback and bind buffers
   * @param tf - TransformFeedback
   * @returns WebGLTransformFeedback
   */
  createGLTransformFeedback(tf) {
    const { gl, renderer, CONTEXT_UID } = this, glTransformFeedback = gl.createTransformFeedback();
    tf._glTransformFeedbacks[CONTEXT_UID] = glTransformFeedback, gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, glTransformFeedback);
    for (let i = 0; i < tf.buffers.length; i++) {
      const buffer = tf.buffers[i];
      buffer && (renderer.buffer.update(buffer), buffer._glBuffers[CONTEXT_UID].refCount++, gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, i, buffer._glBuffers[CONTEXT_UID].buffer || null));
    }
    return gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null), tf.disposeRunner.add(this), glTransformFeedback;
  }
  /**
   * Disposes TransfromFeedback
   * @param {PIXI.TransformFeedback} tf - TransformFeedback
   * @param {boolean} [contextLost=false] - If context was lost, we suppress delete TransformFeedback
   */
  disposeTransformFeedback(tf, contextLost) {
    const glTF = tf._glTransformFeedbacks[this.CONTEXT_UID], gl = this.gl;
    tf.disposeRunner.remove(this);
    const bufferSystem = this.renderer.buffer;
    if (bufferSystem)
      for (let i = 0; i < tf.buffers.length; i++) {
        const buffer = tf.buffers[i];
        if (!buffer)
          continue;
        const buf = buffer._glBuffers[this.CONTEXT_UID];
        buf && (buf.refCount--, buf.refCount === 0 && !contextLost && bufferSystem.dispose(buffer, contextLost));
      }
    glTF && (contextLost || gl.deleteTransformFeedback(glTF), delete tf._glTransformFeedbacks[this.CONTEXT_UID]);
  }
  destroy() {
    this.renderer = null;
  }
}
TransformFeedbackSystem.extension = {
  type: extensions.ExtensionType.RendererSystem,
  name: "transformFeedback"
};
extensions.extensions.add(TransformFeedbackSystem);
exports.TransformFeedbackSystem = TransformFeedbackSystem;
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