Method prepareTexture

packages/gl-react/src/Node.tsx:722–871

(
      initialObj: any,
      uniformOptions: Partial<TextureOptions> | null | undefined,
      uniformKeyName: string
    )

    const textureUnits: Map<WebGLTexture, number> = new Map();

    const prepareTexture = (
      initialObj: any,
      uniformOptions: Partial<TextureOptions> | null | undefined,
      uniformKeyName: string
    ) => {
      let obj = initialObj,
        dependency: (Node | Bus) | null = null,
        result:
          | {
              directTexture?: WebGLTexture | null;
              directTextureSize?: [number, number] | null;
              glNode?: Node;
              glNodePickBackbuffer?: boolean;
            }
          | null = null;

      if (typeof obj === "function") {
        obj = (obj as AsyncMixed)(this.redraw);
      }

      if (!obj) {
        if (obj === undefined) {
          console.warn(
            `${nodeName}, uniform '${uniformKeyName}' is undefined.` +
              "If you explicitely want to clear a texture, set it to null."
          );
        }
      } else if (isBackbuffer(obj)) {
        if (!this.drawProps.backbuffering) {
          console.warn(
            `${nodeName}, uniform ${uniformKeyName}: you must set \`backbuffering\` on Node when using Backbuffer`
          );
        }
        result = { glNode: this, glNodePickBackbuffer: true };
      } else if (isBackbufferFrom(obj)) {
        invariant(
          typeof obj === "object",
          "invalid backbufferFromNode. Got: %s",
          obj
        );
        let node = obj.node;
        if (node instanceof Bus) {
          node = node.getGLRenderableNode();
          invariant(
            node,
            "backbufferFromNode(bus) but bus.getGLRenderableNode() is %s",
            node
          );
        }
        invariant(
          node instanceof Node,
          "invalid backbufferFromNode(obj): obj must be an instanceof Node or Bus. Got: %s",
          obj
        );
        if (!node.drawProps.backbuffering) {
          console.warn(
            `${nodeName}, uniform ${uniformKeyName}: you must set \`backbuffering\` on the Node referenced in backbufferFrom(${node.getGLName()})`
          );