import { uid } from '../../../utils/data/uid.mjs';
import { ViewableBuffer } from '../../../utils/data/ViewableBuffer.mjs';
import { fastCopy } from '../../renderers/shared/buffer/utils/fastCopy.mjs';
import { getAdjustedBlendModeBlend } from '../../renderers/shared/state/getAdjustedBlendModeBlend.mjs';
import { getMaxTexturesPerBatch } from '../gl/utils/maxRecommendedTextures.mjs';
import { BatchTextureArray } from './BatchTextureArray.mjs';

"use strict";
class Batch {
  constructor() {
    this.renderPipeId = "batch";
    this.action = "startBatch";
    // TODO - eventually this could be useful for flagging batches as dirty and then only rebuilding those ones
    // public elementStart = 0;
    // public elementSize = 0;
    // for drawing..
    this.start = 0;
    this.size = 0;
    this.textures = new BatchTextureArray();
    this.blendMode = "normal";
    this.canBundle = true;
  }
  destroy() {
    this.textures = null;
    this.gpuBindGroup = null;
    this.bindGroup = null;
    this.batcher = null;
  }
}
const batchPool = [];
let batchPoolIndex = 0;
function getBatchFromPool() {
  return batchPoolIndex > 0 ? batchPool[--batchPoolIndex] : new Batch();
}
function returnBatchToPool(batch) {
  batchPool[batchPoolIndex++] = batch;
}
let BATCH_TICK = 0;
const _Batcher = class _Batcher {
  constructor(options = {}) {
    /** unique id for this batcher */
    this.uid = uid("batcher");
    /** Indicates whether the batch data has been modified and needs updating. */
    this.dirty = true;
    /** The current index of the batch being processed. */
    this.batchIndex = 0;
    /** An array of all batches created during the current rendering process. */
    this.batches = [];
    this._elements = [];
    _Batcher.defaultOptions.maxTextures = _Batcher.defaultOptions.maxTextures ?? getMaxTexturesPerBatch();
    options = { ..._Batcher.defaultOptions, ...options };
    const { maxTextures, attributesInitialSize, indicesInitialSize } = options;
    this.attributeBuffer = new ViewableBuffer(attributesInitialSize * 4);
    this.indexBuffer = new Uint16Array(indicesInitialSize);
    this.maxTextures = maxTextures;
  }
  begin() {
    this.elementSize = 0;
    this.elementStart = 0;
    this.indexSize = 0;
    this.attributeSize = 0;
    for (let i = 0; i < this.batchIndex; i++) {
      returnBatchToPool(this.batches[i]);
    }
    this.batchIndex = 0;
    this._batchIndexStart = 0;
    this._batchIndexSize = 0;
    this.dirty = true;
  }
  add(batchableObject) {
    this._elements[this.elementSize++] = batchableObject;
    batchableObject._indexStart = this.indexSize;
    batchableObject._attributeStart = this.attributeSize;
    batchableObject._batcher = this;
    this.indexSize += batchableObject.indexSize;
    this.attributeSize += batchableObject.attributeSize * this.vertexSize;
  }
  checkAndUpdateTexture(batchableObject, texture) {
    const textureId = batchableObject._batch.textures.ids[texture._source.uid];
    if (!textureId && textureId !== 0)
      return false;
    batchableObject._textureId = textureId;
    batchableObject.texture = texture;
    return true;
  }
  updateElement(batchableObject) {
    this.dirty = true;
    const attributeBuffer = this.attributeBuffer;
    if (batchableObject.packAsQuad) {
      this.packQuadAttributes(
        batchableObject,
        attributeBuffer.float32View,
        attributeBuffer.uint32View,
        batchableObject._attributeStart,
        batchableObject._textureId
      );
    } else {
      this.packAttributes(
        batchableObject,
        attributeBuffer.float32View,
        attributeBuffer.uint32View,
        batchableObject._attributeStart,
        batchableObject._textureId
      );
    }
  }
  /**
   * breaks the batcher. This happens when a batch gets too big,
   * or we need to switch to a different type of rendering (a filter for example)
   * @param instructionSet
   */
  break(instructionSet) {
    const elements = this._elements;
    if (!elements[this.elementStart])
      return;
    let batch = getBatchFromPool();
    let textureBatch = batch.textures;
    textureBatch.clear();
    const firstElement = elements[this.elementStart];
    let blendMode = getAdjustedBlendModeBlend(firstElement.blendMode, firstElement.texture._source);
    if (this.attributeSize * 4 > this.attributeBuffer.size) {
      this._resizeAttributeBuffer(this.attributeSize * 4);
    }
    if (this.indexSize > this.indexBuffer.length) {
      this._resizeIndexBuffer(this.indexSize);
    }
    const f32 = this.attributeBuffer.float32View;
    const u32 = this.attributeBuffer.uint32View;
    const indexBuffer = this.indexBuffer;
    let size = this._batchIndexSize;
    let start = this._batchIndexStart;
    let action = "startBatch";
    const maxTextures = this.maxTextures;
    for (let i = this.elementStart; i < this.elementSize; ++i) {
      const element = elements[i];
      elements[i] = null;
      const texture = element.texture;
      const source = texture._source;
      const adjustedBlendMode = getAdjustedBlendModeBlend(element.blendMode, source);
      const breakRequired = blendMode !== adjustedBlendMode;
      if (source._batchTick === BATCH_TICK && !breakRequired) {
        element._textureId = source._textureBindLocation;
        size += element.indexSize;
        if (element.packAsQuad) {
          this.packQuadAttributes(
            element,
            f32,
            u32,
            element._attributeStart,
            element._textureId
          );
          this.packQuadIndex(
            indexBuffer,
            element._indexStart,
            element._attributeStart / this.vertexSize
          );
        } else {
          this.packAttributes(
            element,
            f32,
            u32,
            element._attributeStart,
            element._textureId
          );
          this.packIndex(
            element,
            indexBuffer,
            element._indexStart,
            element._attributeStart / this.vertexSize
          );
        }
        element._batch = batch;
        continue;
      }
      source._batchTick = BATCH_TICK;
      if (textureBatch.count >= maxTextures || breakRequired) {
        this._finishBatch(
          batch,
          start,
          size - start,
          textureBatch,
          blendMode,
          instructionSet,
          action
        );
        action = "renderBatch";
        start = size;
        blendMode = adjustedBlendMode;
        batch = getBatchFromPool();
        textureBatch = batch.textures;
        textureBatch.clear();
        ++BATCH_TICK;
      }
      element._textureId = source._textureBindLocation = textureBatch.count;
      textureBatch.ids[source.uid] = textureBatch.count;
      textureBatch.textures[textureBatch.count++] = source;
      element._batch = batch;
      size += element.indexSize;
      if (element.packAsQuad) {
        this.packQuadAttributes(
          element,
          f32,
          u32,
          element._attributeStart,
          element._textureId
        );
        this.packQuadIndex(
          indexBuffer,
          element._indexStart,
          element._attributeStart / this.vertexSize
        );
      } else {
        this.packAttributes(
          element,
          f32,
          u32,
          element._attributeStart,
          element._textureId
        );
        this.packIndex(
          element,
          indexBuffer,
          element._indexStart,
          element._attributeStart / this.vertexSize
        );
      }
    }
    if (textureBatch.count > 0) {
      this._finishBatch(
        batch,
        start,
        size - start,
        textureBatch,
        blendMode,
        instructionSet,
        action
      );
      start = size;
      ++BATCH_TICK;
    }
    this.elementStart = this.elementSize;
    this._batchIndexStart = start;
    this._batchIndexSize = size;
  }
  _finishBatch(batch, indexStart, indexSize, textureBatch, blendMode, instructionSet, action) {
    batch.gpuBindGroup = null;
    batch.bindGroup = null;
    batch.action = action;
    batch.batcher = this;
    batch.textures = textureBatch;
    batch.blendMode = blendMode;
    batch.start = indexStart;
    batch.size = indexSize;
    ++BATCH_TICK;
    this.batches[this.batchIndex++] = batch;
    instructionSet.add(batch);
  }
  finish(instructionSet) {
    this.break(instructionSet);
  }
  /**
   * Resizes the attribute buffer to the given size (1 = 1 float32)
   * @param size - the size in vertices to ensure (not bytes!)
   */
  ensureAttributeBuffer(size) {
    if (size * 4 <= this.attributeBuffer.size)
      return;
    this._resizeAttributeBuffer(size * 4);
  }
  /**
   * Resizes the index buffer to the given size (1 = 1 float32)
   * @param size - the size in vertices to ensure (not bytes!)
   */
  ensureIndexBuffer(size) {
    if (size <= this.indexBuffer.length)
      return;
    this._resizeIndexBuffer(size);
  }
  _resizeAttributeBuffer(size) {
    const newSize = Math.max(size, this.attributeBuffer.size * 2);
    const newArrayBuffer = new ViewableBuffer(newSize);
    fastCopy(this.attributeBuffer.rawBinaryData, newArrayBuffer.rawBinaryData);
    this.attributeBuffer = newArrayBuffer;
  }
  _resizeIndexBuffer(size) {
    const indexBuffer = this.indexBuffer;
    let newSize = Math.max(size, indexBuffer.length * 1.5);
    newSize += newSize % 2;
    const newIndexBuffer = newSize > 65535 ? new Uint32Array(newSize) : new Uint16Array(newSize);
    if (newIndexBuffer.BYTES_PER_ELEMENT !== indexBuffer.BYTES_PER_ELEMENT) {
      for (let i = 0; i < indexBuffer.length; i++) {
        newIndexBuffer[i] = indexBuffer[i];
      }
    } else {
      fastCopy(indexBuffer.buffer, newIndexBuffer.buffer);
    }
    this.indexBuffer = newIndexBuffer;
  }
  packQuadIndex(indexBuffer, index, indicesOffset) {
    indexBuffer[index] = indicesOffset + 0;
    indexBuffer[index + 1] = indicesOffset + 1;
    indexBuffer[index + 2] = indicesOffset + 2;
    indexBuffer[index + 3] = indicesOffset + 0;
    indexBuffer[index + 4] = indicesOffset + 2;
    indexBuffer[index + 5] = indicesOffset + 3;
  }
  packIndex(element, indexBuffer, index, indicesOffset) {
    const indices = element.indices;
    const size = element.indexSize;
    const indexOffset = element.indexOffset;
    const attributeOffset = element.attributeOffset;
    for (let i = 0; i < size; i++) {
      indexBuffer[index++] = indicesOffset + indices[i + indexOffset] - attributeOffset;
    }
  }
  destroy() {
    for (let i = 0; i < this.batches.length; i++) {
      returnBatchToPool(this.batches[i]);
    }
    this.batches = null;
    for (let i = 0; i < this._elements.length; i++) {
      this._elements[i]._batch = null;
    }
    this._elements = null;
    this.indexBuffer = null;
    this.attributeBuffer.destroy();
    this.attributeBuffer = null;
  }
};
_Batcher.defaultOptions = {
  maxTextures: null,
  attributesInitialSize: 4,
  indicesInitialSize: 6
};
let Batcher = _Batcher;

export { Batch, Batcher };
//# sourceMappingURL=Batcher.mjs.map
