import Constants from './Texture/Constants.js';
import HalfFloat from '../../Common/Core/HalfFloat.js';
import { n as newInstance$1, o as obj, s as set, e as setGet, g as get, i as moveToProtected, a as newTypedArray, c as macro } from '../../macros2.js';
import vtkDataArray from '../../Common/Core/DataArray.js';
import { V as isPowerOfTwo, R as nearestPowerOfTwo } from '../../Common/Core/Math/index.js';
import vtkViewNode from '../SceneGraph/ViewNode.js';
import { registerOverride } from './ViewNodeFactory.js';
import supportsNorm16Linear from './Texture/supportsNorm16Linear.js';


const {
  Wrap,
  Filter
} = Constants;
const {
  VtkDataTypes
} = vtkDataArray;
const {
  vtkDebugMacro,
  vtkErrorMacro,
  vtkWarningMacro
} = macro;
const {
  toHalf
} = HalfFloat;

// ----------------------------------------------------------------------------
// vtkOpenGLTexture methods
// ----------------------------------------------------------------------------

function vtkOpenGLTexture(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkOpenGLTexture');
  // Renders myself
  publicAPI.render = function () {
    let renWin = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
    if (renWin) {
      model._openGLRenderWindow = renWin;
    } else {
      model._openGLRenderer = publicAPI.getFirstAncestorOfType('vtkOpenGLRenderer');
      // sync renderable properties
      model._openGLRenderWindow = model._openGLRenderer.getLastAncestorOfType('vtkOpenGLRenderWindow');
    }
    model.context = model._openGLRenderWindow.getContext();
    if (model.renderable.getInterpolate()) {
      if (model.generateMipmap) {
        publicAPI.setMinificationFilter(Filter.LINEAR_MIPMAP_LINEAR);
      } else {
        publicAPI.setMinificationFilter(Filter.LINEAR);
      }
      publicAPI.setMagnificationFilter(Filter.LINEAR);
    } else {
      publicAPI.setMinificationFilter(Filter.NEAREST);
      publicAPI.setMagnificationFilter(Filter.NEAREST);
    }
    if (model.renderable.getRepeat()) {
      publicAPI.setWrapR(Wrap.REPEAT);
      publicAPI.setWrapS(Wrap.REPEAT);
      publicAPI.setWrapT(Wrap.REPEAT);
    }
    // clear image if input data is set
    if (model.renderable.getInputData()) {
      model.renderable.setImage(null);
    }
    // create the texture if it is not done already
    if (!model.handle || model.renderable.getMTime() > model.textureBuildTime.getMTime()) {
      // if we have an Image
      if (model.renderable.getImage() !== null) {
        if (model.renderable.getInterpolate()) {
          model.generateMipmap = true;
          publicAPI.setMinificationFilter(Filter.LINEAR_MIPMAP_LINEAR);
        }
        // Have an Image which may not be complete
        if (model.renderable.getImage() && model.renderable.getImageLoaded()) {
          publicAPI.create2DFromImage(model.renderable.getImage());
          publicAPI.activate();
          publicAPI.sendParameters();
          model.textureBuildTime.modified();
        }
      }
      // if we have a canvas
      if (model.renderable.getCanvas() !== null) {
        if (model.renderable.getInterpolate()) {
          model.generateMipmap = true;
          publicAPI.setMinificationFilter(Filter.LINEAR_MIPMAP_LINEAR);
        }
        const canvas = model.renderable.getCanvas();
        publicAPI.create2DFromRaw(canvas.width, canvas.height, 4, VtkDataTypes.UNSIGNED_CHAR, canvas, true);
        publicAPI.activate();
        publicAPI.sendParameters();
        model.textureBuildTime.modified();
      }
      // if we have jsImageData
      if (model.renderable.getJsImageData() !== null) {
        const jsid = model.renderable.getJsImageData();
        if (model.renderable.getInterpolate()) {
          model.generateMipmap = true;
          publicAPI.setMinificationFilter(Filter.LINEAR_MIPMAP_LINEAR);
        }
        publicAPI.create2DFromRaw(jsid.width, jsid.height, 4, VtkDataTypes.UNSIGNED_CHAR, jsid.data, true);
        publicAPI.activate();
        publicAPI.sendParameters();
        model.textureBuildTime.modified();
      }
      // if we have InputData
      const input = model.renderable.getInputData(0);
      if (input && input.getPointData().getScalars()) {
        const ext = input.getExtent();
        const inScalars = input.getPointData().getScalars();

        // do we have a cube map? Six inputs
        const data = [];
        for (let i = 0; i < model.renderable.getNumberOfInputPorts(); ++i) {
          const indata = model.renderable.getInputData(i);
          const scalars = indata ? indata.getPointData().getScalars().getData() : null;
          if (scalars) {
            data.push(scalars);
          }
        }
        if (model.renderable.getInterpolate() && inScalars.getNumberOfComponents() === 4) {
          model.generateMipmap = true;
          publicAPI.setMinificationFilter(Filter.LINEAR_MIPMAP_LINEAR);
        }
        if (data.length % 6 === 0) {
          publicAPI.createCubeFromRaw(ext[1] - ext[0] + 1, ext[3] - ext[2] + 1, inScalars.getNumberOfComponents(), inScalars.getDataType(), data);
        } else {
          publicAPI.create2DFromRaw(ext[1] - ext[0] + 1, ext[3] - ext[2] + 1, inScalars.getNumberOfComponents(), inScalars.getDataType(), inScalars.getData());
        }
        publicAPI.activate();
        publicAPI.sendParameters();
        model.textureBuildTime.modified();
      }
    }
    if (model.handle) {
      publicAPI.activate();
    }
  };

  const getNorm16Ext = () => {
    if (
      (model.minificationFilter === Filter.LINEAR ||
        model.magnificationFilter === Filter.LINEAR) &&
        !supportsNorm16Linear()
    ) {
      return undefined;
    }
    return model.oglNorm16Ext;
  };


  //----------------------------------------------------------------------------
  publicAPI.destroyTexture = () => {
    // deactivate it first
    publicAPI.deactivate();
    if (model.context && model.handle) {
      model.context.deleteTexture(model.handle);
    }
    model.handle = 0;
    model.numberOfDimensions = 0;
    model.target = 0;
    model.components = 0;
    model.width = 0;
    model.height = 0;
    model.depth = 0;
    publicAPI.resetFormatAndType();
  };

  //----------------------------------------------------------------------------
  publicAPI.createTexture = () => {
    // reuse the existing handle if we have one
    if (!model.handle) {
      model.handle = model.context.createTexture();
      if (model.target) {
        model.context.bindTexture(model.target, model.handle);

        // See: http://www.openmodel.context..org/wiki/Common_Mistakes#Creating_a_complete_texture
        // turn off mip map filter or set the base and max level correctly. here
        // both are done.
        model.context.texParameteri(model.target, model.context.TEXTURE_MIN_FILTER, publicAPI.getOpenGLFilterMode(model.minificationFilter));
        model.context.texParameteri(model.target, model.context.TEXTURE_MAG_FILTER, publicAPI.getOpenGLFilterMode(model.magnificationFilter));
        model.context.texParameteri(model.target, model.context.TEXTURE_WRAP_S, publicAPI.getOpenGLWrapMode(model.wrapS));
        model.context.texParameteri(model.target, model.context.TEXTURE_WRAP_T, publicAPI.getOpenGLWrapMode(model.wrapT));
        if (model._openGLRenderWindow.getWebgl2()) {
          model.context.texParameteri(model.target, model.context.TEXTURE_WRAP_R, publicAPI.getOpenGLWrapMode(model.wrapR));
        }
        model.context.bindTexture(model.target, null);
      }
    }
  };

  //---------------------------------------------------------------------------
  publicAPI.getTextureUnit = () => {
    if (model._openGLRenderWindow) {
      return model._openGLRenderWindow.getTextureUnitForTexture(publicAPI);
    }
    return -1;
  };

  //---------------------------------------------------------------------------
  publicAPI.activate = () => {
    // activate a free texture unit for this texture
    model._openGLRenderWindow.activateTexture(publicAPI);
    publicAPI.bind();
  };

  //---------------------------------------------------------------------------
  publicAPI.deactivate = () => {
    if (model._openGLRenderWindow) {
      model._openGLRenderWindow.deactivateTexture(publicAPI);
    }
  };

  //---------------------------------------------------------------------------
  publicAPI.releaseGraphicsResources = rwin => {
    if (rwin && model.handle) {
      rwin.activateTexture(publicAPI);
      rwin.deactivateTexture(publicAPI);
      model.context.deleteTexture(model.handle);
      model.handle = 0;
      model.numberOfDimensions = 0;
      model.target = 0;
      model.internalFormat = 0;
      model.format = 0;
      model.openGLDataType = 0;
      model.components = 0;
      model.width = 0;
      model.height = 0;
      model.depth = 0;
      model.allocatedGPUMemoryInBytes = 0;
    }
    if (model.shaderProgram) {
      model.shaderProgram.releaseGraphicsResources(rwin);
      model.shaderProgram = null;
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.bind = () => {
    model.context.bindTexture(model.target, model.handle);
    if (model.autoParameters && publicAPI.getMTime() > model.sendParametersTime.getMTime()) {
      publicAPI.sendParameters();
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.isBound = () => {
    let result = false;
    if (model.context && model.handle) {
      let target = 0;
      switch (model.target) {
        case model.context.TEXTURE_2D:
          target = model.context.TEXTURE_BINDING_2D;
          break;
        default:
          vtkWarningMacro('impossible case');
          break;
      }
      const oid = model.context.getIntegerv(target);
      result = oid === model.handle;
    }
    return result;
  };

  //----------------------------------------------------------------------------
  publicAPI.sendParameters = () => {
    model.context.texParameteri(model.target, model.context.TEXTURE_WRAP_S, publicAPI.getOpenGLWrapMode(model.wrapS));
    model.context.texParameteri(model.target, model.context.TEXTURE_WRAP_T, publicAPI.getOpenGLWrapMode(model.wrapT));
    if (model._openGLRenderWindow.getWebgl2()) {
      model.context.texParameteri(model.target, model.context.TEXTURE_WRAP_R, publicAPI.getOpenGLWrapMode(model.wrapR));
    }
    model.context.texParameteri(model.target, model.context.TEXTURE_MIN_FILTER, publicAPI.getOpenGLFilterMode(model.minificationFilter));
    model.context.texParameteri(model.target, model.context.TEXTURE_MAG_FILTER, publicAPI.getOpenGLFilterMode(model.magnificationFilter));
    if (model._openGLRenderWindow.getWebgl2()) {
      model.context.texParameteri(model.target, model.context.TEXTURE_BASE_LEVEL, model.baseLevel);
      model.context.texParameteri(model.target, model.context.TEXTURE_MAX_LEVEL, model.maxLevel);
    }

    // model.context.texParameterf(model.target, model.context.TEXTURE_MIN_LOD, model.minLOD);
    // model.context.texParameterf(model.target, model.context.TEXTURE_MAX_LOD, model.maxLOD);

    model.sendParametersTime.modified();
  };

  //----------------------------------------------------------------------------
  publicAPI.getInternalFormat = (vtktype, numComps) => {
    if (!model._forceInternalFormat) {
      model.internalFormat = publicAPI.getDefaultInternalFormat(vtktype, numComps);
    }
    if (!model.internalFormat) {
      vtkDebugMacro(`Unable to find suitable internal format for T=${vtktype} NC= ${numComps}`);
    }
    if ([model.context.R32F, model.context.RG32F, model.context.RGB32F, model.context.RGBA32F].includes(model.internalFormat) && !model.context.getExtension('OES_texture_float_linear')) {
      vtkWarningMacro('Failed to load OES_texture_float_linear. Texture filtering is not available for *32F internal formats.');
    }
    return model.internalFormat;
  };

  //----------------------------------------------------------------------------
  publicAPI.getDefaultInternalFormat = (vtktype, numComps) => {
    let result = 0;
    // try default next
    result = model._openGLRenderWindow.getDefaultTextureInternalFormat(vtktype, numComps, getNorm16Ext(), publicAPI.useHalfFloat());
    if (result) {
      return result;
    }
    if (!result) {
      vtkDebugMacro('Unsupported internal texture type!');
      vtkDebugMacro(`Unable to find suitable internal format for T=${vtktype} NC= ${numComps}`);
    }
    return result;
  };
  publicAPI.useHalfFloat = () => model.enableUseHalfFloat && model.canUseHalfFloat;

  //----------------------------------------------------------------------------
  publicAPI.setInternalFormat = iFormat => {
    model._forceInternalFormat = true;
    if (iFormat !== model.internalFormat) {
      model.internalFormat = iFormat;
      publicAPI.modified();
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.getFormat = (vtktype, numComps) => {
    model.format = publicAPI.getDefaultFormat(vtktype, numComps);
    return model.format;
  };

  //----------------------------------------------------------------------------
  publicAPI.getDefaultFormat = (vtktype, numComps) => {
    if (model._openGLRenderWindow.getWebgl2()) {
      switch (numComps) {
        case 1:
          return model.context.RED;
        case 2:
          return model.context.RG;
        case 3:
          return model.context.RGB;
        case 4:
          return model.context.RGBA;
        default:
          return model.context.RGB;
      }
    } else {
      // webgl1
      switch (numComps) {
        case 1:
          return model.context.LUMINANCE;
        case 2:
          return model.context.LUMINANCE_ALPHA;
        case 3:
          return model.context.RGB;
        case 4:
          return model.context.RGBA;
        default:
          return model.context.RGB;
      }
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.resetFormatAndType = () => {
    model.format = 0;
    model.internalFormat = 0;
    model._forceInternalFormat = false;
    model.openGLDataType = 0;
  };

  //----------------------------------------------------------------------------
  publicAPI.getDefaultDataType = vtkScalarType => {
    const useHalfFloat = publicAPI.useHalfFloat();
    // DON'T DEAL with VTK_CHAR as this is platform dependent.
    if (model._openGLRenderWindow.getWebgl2()) {
      switch (vtkScalarType) {
        // case VtkDataTypes.SIGNED_CHAR:
        //   return model.context.BYTE;
        case VtkDataTypes.UNSIGNED_CHAR:
          return model.context.UNSIGNED_BYTE;
        // prefer norm16 since that is accurate compared to
        // half float which is not
        case getNorm16Ext() && !useHalfFloat && VtkDataTypes.SHORT:
          return model.context.SHORT;
        case getNorm16Ext() && !useHalfFloat && VtkDataTypes.UNSIGNED_SHORT:
          return model.context.UNSIGNED_SHORT;
        // use half float type
        case useHalfFloat && VtkDataTypes.SHORT:
          return model.context.HALF_FLOAT;
        case useHalfFloat && VtkDataTypes.UNSIGNED_SHORT:
          return model.context.HALF_FLOAT;
        // case VtkDataTypes.INT:
        //   return model.context.INT;
        // case VtkDataTypes.UNSIGNED_INT:
        //   return model.context.UNSIGNED_INT;
        case VtkDataTypes.FLOAT:
        case VtkDataTypes.VOID: // used for depth component textures.
        default:
          return model.context.FLOAT;
      }
    }
    switch (vtkScalarType) {
      // case VtkDataTypes.SIGNED_CHAR:
      //   return model.context.BYTE;
      case VtkDataTypes.UNSIGNED_CHAR:
        return model.context.UNSIGNED_BYTE;
      // case VtkDataTypes.SHORT:
      //   return model.context.SHORT;
      // case VtkDataTypes.UNSIGNED_SHORT:
      //   return model.context.UNSIGNED_SHORT;
      // case VtkDataTypes.INT:
      //   return model.context.INT;
      // case VtkDataTypes.UNSIGNED_INT:
      //   return model.context.UNSIGNED_INT;
      case VtkDataTypes.FLOAT:
      case VtkDataTypes.VOID: // used for depth component textures.
      default:
        if (model.context.getExtension('OES_texture_float') && model.context.getExtension('OES_texture_float_linear')) {
          return model.context.FLOAT;
        }
        {
          const halfFloat = model.context.getExtension('OES_texture_half_float');
          if (halfFloat && model.context.getExtension('OES_texture_half_float_linear')) {
            return halfFloat.HALF_FLOAT_OES;
          }
        }
        return model.context.UNSIGNED_BYTE;
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.getOpenGLDataType = function (vtkScalarType) {
    let forceUpdate = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
    if (!model.openGLDataType || forceUpdate) {
      model.openGLDataType = publicAPI.getDefaultDataType(vtkScalarType);
    }
    return model.openGLDataType;
  };
  publicAPI.getShiftAndScale = () => {
    let shift = 0.0;
    let scale = 1.0;

    // for all float type internal formats
    switch (model.openGLDataType) {
      case model.context.BYTE:
        scale = 127.5;
        shift = scale - 128.0;
        break;
      case model.context.UNSIGNED_BYTE:
        scale = 255.0;
        shift = 0.0;
        break;
      case model.context.SHORT:
        scale = 32767.5;
        shift = scale - 32768.0;
        break;
      case model.context.UNSIGNED_SHORT:
        scale = 65536.0;
        shift = 0.0;
        break;
      case model.context.INT:
        scale = 2147483647.5;
        shift = scale - 2147483648.0;
        break;
      case model.context.UNSIGNED_INT:
        scale = 4294967295.0;
        shift = 0.0;
        break;
      case model.context.FLOAT:
    }
    return {
      shift,
      scale
    };
  };

  //----------------------------------------------------------------------------
  publicAPI.getOpenGLFilterMode = emode => {
    switch (emode) {
      case Filter.NEAREST:
        return model.context.NEAREST;
      case Filter.LINEAR:
        return model.context.LINEAR;
      case Filter.NEAREST_MIPMAP_NEAREST:
        return model.context.NEAREST_MIPMAP_NEAREST;
      case Filter.NEAREST_MIPMAP_LINEAR:
        return model.context.NEAREST_MIPMAP_LINEAR;
      case Filter.LINEAR_MIPMAP_NEAREST:
        return model.context.LINEAR_MIPMAP_NEAREST;
      case Filter.LINEAR_MIPMAP_LINEAR:
        return model.context.LINEAR_MIPMAP_LINEAR;
      default:
        return model.context.NEAREST;
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.getOpenGLWrapMode = vtktype => {
    switch (vtktype) {
      case Wrap.CLAMP_TO_EDGE:
        return model.context.CLAMP_TO_EDGE;
      case Wrap.REPEAT:
        return model.context.REPEAT;
      case Wrap.MIRRORED_REPEAT:
        return model.context.MIRRORED_REPEAT;
      default:
        return model.context.CLAMP_TO_EDGE;
    }
  };

  /**
   * Updates the data array to match the required data type for OpenGL.
   *
   * This function takes the input data and converts it to the appropriate
   * format required by the OpenGL texture, based on the specified data type.
   *
   * @param {string} dataType - The original data type of the input data.
   * @param {Array} data - The input data array that needs to be updated.
   * @param {boolean} [depth=false] - Indicates whether the data is a 3D array.
   * @returns {Array} The updated data array that matches the OpenGL data type.
   */
  publicAPI.updateArrayDataTypeForGL = function (dataType, data) {
    let depth = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    const pixData = [];
    let pixCount = model.width * model.height * model.components;
    if (depth) {
      pixCount *= model.depth;
    }

    // if the opengl data type is float
    // then the data array must be float
    if (dataType !== VtkDataTypes.FLOAT && model.openGLDataType === model.context.FLOAT) {
      for (let idx = 0; idx < data.length; idx++) {
        if (data[idx]) {
          const dataArrayToCopy = data[idx].length > pixCount ? data[idx].subarray(0, pixCount) : data[idx];
          pixData.push(new Float32Array(dataArrayToCopy));
        } else {
          pixData.push(null);
        }
      }
    }

    // if the opengl data type is ubyte
    // then the data array must be u8, we currently simply truncate the data
    if (dataType !== VtkDataTypes.UNSIGNED_CHAR && model.openGLDataType === model.context.UNSIGNED_BYTE) {
      for (let idx = 0; idx < data.length; idx++) {
        if (data[idx]) {
          const dataArrayToCopy = data[idx].length > pixCount ? data[idx].subarray(0, pixCount) : data[idx];
          pixData.push(new Uint8Array(dataArrayToCopy));
        } else {
          pixData.push(null);
        }
      }
    }

    // if the opengl data type is half float
    // then the data array must be u16
    let halfFloat = false;
    if (model._openGLRenderWindow.getWebgl2()) {
      halfFloat = model.openGLDataType === model.context.HALF_FLOAT;
    } else {
      const halfFloatExt = model.context.getExtension('OES_texture_half_float');
      halfFloat = halfFloatExt && model.openGLDataType === halfFloatExt.HALF_FLOAT_OES;
    }
    if (halfFloat) {
      for (let idx = 0; idx < data.length; idx++) {
        if (data[idx]) {
          const newArray = new Uint16Array(pixCount);
          const src = data[idx];
          for (let i = 0; i < pixCount; i++) {
            newArray[i] = toHalf(src[i]);
          }
          pixData.push(newArray);
        } else {
          pixData.push(null);
        }
      }
    }

    // The output has to be filled
    if (pixData.length === 0) {
      for (let i = 0; i < data.length; i++) {
        pixData.push(data[i]);
      }
    }
    return pixData;
  };

  //----------------------------------------------------------------------------
  function scaleTextureToHighestPowerOfTwo(data) {
    if (model._openGLRenderWindow.getWebgl2()) {
      // No need if webGL2
      return data;
    }
    const pixData = [];
    const width = model.width;
    const height = model.height;
    const numComps = model.components;
    if (data && (!isPowerOfTwo(width) || !isPowerOfTwo(height))) {
      // Scale up the texture to the next highest power of two dimensions.
      const halfFloat = model.context.getExtension('OES_texture_half_float');
      const newWidth = nearestPowerOfTwo(width);
      const newHeight = nearestPowerOfTwo(height);
      const pixCount = newWidth * newHeight * model.components;
      for (let idx = 0; idx < data.length; idx++) {
        if (data[idx] !== null) {
          let newArray = null;
          const jFactor = height / newHeight;
          const iFactor = width / newWidth;
          let usingHalf = false;
          if (model.openGLDataType === model.context.FLOAT) {
            newArray = new Float32Array(pixCount);
          } else if (halfFloat && model.openGLDataType === halfFloat.HALF_FLOAT_OES) {
            newArray = new Uint16Array(pixCount);
            usingHalf = true;
          } else {
            newArray = new Uint8Array(pixCount);
          }
          for (let j = 0; j < newHeight; j++) {
            const joff = j * newWidth * numComps;
            const jidx = j * jFactor;
            let jlow = Math.floor(jidx);
            let jhi = Math.ceil(jidx);
            if (jhi >= height) {
              jhi = height - 1;
            }
            const jmix = jidx - jlow;
            const jmix1 = 1.0 - jmix;
            jlow = jlow * width * numComps;
            jhi = jhi * width * numComps;
            for (let i = 0; i < newWidth; i++) {
              const ioff = i * numComps;
              const iidx = i * iFactor;
              let ilow = Math.floor(iidx);
              let ihi = Math.ceil(iidx);
              if (ihi >= width) {
                ihi = width - 1;
              }
              const imix = iidx - ilow;
              ilow *= numComps;
              ihi *= numComps;
              for (let c = 0; c < numComps; c++) {
                if (usingHalf) {
                  newArray[joff + ioff + c] = HalfFloat.toHalf(HalfFloat.fromHalf(data[idx][jlow + ilow + c]) * jmix1 * (1.0 - imix) + HalfFloat.fromHalf(data[idx][jlow + ihi + c]) * jmix1 * imix + HalfFloat.fromHalf(data[idx][jhi + ilow + c]) * jmix * (1.0 - imix) + HalfFloat.fromHalf(data[idx][jhi + ihi + c]) * jmix * imix);
                } else {
                  newArray[joff + ioff + c] = data[idx][jlow + ilow + c] * jmix1 * (1.0 - imix) + data[idx][jlow + ihi + c] * jmix1 * imix + data[idx][jhi + ilow + c] * jmix * (1.0 - imix) + data[idx][jhi + ihi + c] * jmix * imix;
                }
              }
            }
          }
          pixData.push(newArray);
          model.width = newWidth;
          model.height = newHeight;
        } else {
          pixData.push(null);
        }
      }
    }

    // The output has to be filled
    if (pixData.length === 0) {
      for (let i = 0; i < data.length; i++) {
        pixData.push(data[i]);
      }
    }
    return pixData;
  }

  //----------------------------------------------------------------------------
  function useTexStorage(dataType) {
    if (model._openGLRenderWindow) {
      if (model.resizable || model.renderable?.getResizable()) {
        // Cannot use texStorage if the texture is supposed to be resizable.
        return false;
      }
      if (model._openGLRenderWindow.getWebgl2()) {
        const webGLInfo = model._openGLRenderWindow.getGLInformations();
        if (webGLInfo.RENDERER.value.match(/WebKit/gi) && navigator.platform.match(/Mac/gi) && getNorm16Ext() && (dataType === VtkDataTypes.UNSIGNED_SHORT || dataType === VtkDataTypes.SHORT)) {
          // Cannot use texStorage with EXT_texture_norm16 textures on Mac M1 GPU.
          // No errors reported but the texture is unusable.
          return false;
        }
        // Use texStorage for WebGL2
        return true;
      }
      return false;
    }
    return false;
  }

  //----------------------------------------------------------------------------
  publicAPI.create2DFromRaw = function (width, height, numComps, dataType, data) {
    let flip = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : false;
    // Now determine the texture parameters using the arguments.
    publicAPI.getOpenGLDataType(dataType, true);
    publicAPI.getInternalFormat(dataType, numComps);
    publicAPI.getFormat(dataType, numComps);
    if (!model.internalFormat || !model.format || !model.openGLDataType) {
      vtkErrorMacro('Failed to determine texture parameters.');
      return false;
    }
    model.target = model.context.TEXTURE_2D;
    model.components = numComps;
    model.width = width;
    model.height = height;
    model.depth = 1;
    model.numberOfDimensions = 2;
    model._openGLRenderWindow.activateTexture(publicAPI);
    publicAPI.createTexture();
    publicAPI.bind();

    // Create an array of texture with one texture
    const dataArray = [data];
    const pixData = publicAPI.updateArrayDataTypeForGL(dataType, dataArray);
    const scaledData = scaleTextureToHighestPowerOfTwo(pixData);

    // Source texture data from the PBO.
    model.context.pixelStorei(model.context.UNPACK_FLIP_Y_WEBGL, flip);
    model.context.pixelStorei(model.context.UNPACK_ALIGNMENT, 1);
    if (useTexStorage(dataType)) {
      model.context.texStorage2D(model.target, 1, model.internalFormat, model.width, model.height);
      if (scaledData[0] != null) {
        model.context.texSubImage2D(model.target, 0, 0, 0, model.width, model.height, model.format, model.openGLDataType, scaledData[0]);
      }
    } else {
      model.context.texImage2D(model.target, 0, model.internalFormat, model.width, model.height, 0, model.format, model.openGLDataType, scaledData[0]);
    }
    if (model.generateMipmap) {
      model.context.generateMipmap(model.target);
    }

    // always reset the flip
    if (flip) {
      model.context.pixelStorei(model.context.UNPACK_FLIP_Y_WEBGL, false);
    }
    model.allocatedGPUMemoryInBytes = model.width * model.height * model.depth * numComps * model._openGLRenderWindow.getDefaultTextureByteSize(dataType, getNorm16Ext(), publicAPI.useHalfFloat());
    publicAPI.deactivate();
    return true;
  };

  //----------------------------------------------------------------------------
  publicAPI.createCubeFromRaw = (width, height, numComps, dataType, data) => {
    // Now determine the texture parameters using the arguments.
    publicAPI.getOpenGLDataType(dataType);
    publicAPI.getInternalFormat(dataType, numComps);
    publicAPI.getFormat(dataType, numComps);
    if (!model.internalFormat || !model.format || !model.openGLDataType) {
      vtkErrorMacro('Failed to determine texture parameters.');
      return false;
    }
    model.target = model.context.TEXTURE_CUBE_MAP;
    model.components = numComps;
    model.width = width;
    model.height = height;
    model.depth = 1;
    model.numberOfDimensions = 2;
    model._openGLRenderWindow.activateTexture(publicAPI);
    model.maxLevel = data.length / 6 - 1;
    publicAPI.createTexture();
    publicAPI.bind();
    const pixData = publicAPI.updateArrayDataTypeForGL(dataType, data);
    const scaledData = scaleTextureToHighestPowerOfTwo(pixData);

    // invert the data because opengl is messed up with cube maps
    // and uses the old renderman standard with Y going down
    // even though it is completely at odds with OpenGL standards
    const invertedData = [];
    let widthLevel = model.width;
    let heightLevel = model.height;
    for (let i = 0; i < scaledData.length; i++) {
      if (i % 6 === 0 && i !== 0) {
        widthLevel /= 2;
        heightLevel /= 2;
      }
      invertedData[i] = newTypedArray(dataType, heightLevel * widthLevel * model.components);
      for (let y = 0; y < heightLevel; ++y) {
        const row1 = y * widthLevel * model.components;
        const row2 = (heightLevel - y - 1) * widthLevel * model.components;
        invertedData[i].set(scaledData[i].slice(row2, row2 + widthLevel * model.components), row1);
      }
    }

    // Source texture data from the PBO.
    model.context.pixelStorei(model.context.UNPACK_ALIGNMENT, 1);
    if (useTexStorage(dataType)) {
      model.context.texStorage2D(model.target, 6, model.internalFormat, model.width, model.height);
    }
    // We get the 6 images
    for (let i = 0; i < 6; i++) {
      // For each mipmap level
      let j = 0;
      let w = model.width;
      let h = model.height;
      while (w >= 1 && h >= 1) {
        // In webgl 1, all levels need to be defined. So if the latest level size is
        // 8x8, we have to add 3 more null textures (4x4, 2x2, 1x1)
        // In webgl 2, the attribute maxLevel will be use.
        let tempData = null;
        if (j <= model.maxLevel) {
          tempData = invertedData[6 * j + i];
        }
        if (useTexStorage(dataType)) {
          if (tempData != null) {
            model.context.texSubImage2D(model.context.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, 0, 0, w, h, model.format, model.openGLDataType, tempData);
          }
        } else {
          model.context.texImage2D(model.context.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, model.internalFormat, w, h, 0, model.format, model.openGLDataType, tempData);
        }
        j++;
        w /= 2;
        h /= 2;
      }
    }
    model.allocatedGPUMemoryInBytes = model.width * model.height * model.depth * numComps * model._openGLRenderWindow.getDefaultTextureByteSize(dataType, getNorm16Ext(), publicAPI.useHalfFloat());
    // generateMipmap must not be called here because we manually upload all levels
    // if it is called, all levels will be overwritten

    publicAPI.deactivate();
    return true;
  };

  //----------------------------------------------------------------------------
  publicAPI.createDepthFromRaw = (width, height, dataType, data) => {
    // Now determine the texture parameters using the arguments.
    publicAPI.getOpenGLDataType(dataType);
    model.format = model.context.DEPTH_COMPONENT;
    if (model._openGLRenderWindow.getWebgl2()) {
      if (dataType === VtkDataTypes.FLOAT) {
        model.internalFormat = model.context.DEPTH_COMPONENT32F;
      } else {
        model.internalFormat = model.context.DEPTH_COMPONENT16;
      }
    } else {
      model.internalFormat = model.context.DEPTH_COMPONENT;
    }
    if (!model.internalFormat || !model.format || !model.openGLDataType) {
      vtkErrorMacro('Failed to determine texture parameters.');
      return false;
    }
    model.target = model.context.TEXTURE_2D;
    model.components = 1;
    model.width = width;
    model.height = height;
    model.depth = 1;
    model.numberOfDimensions = 2;
    model._openGLRenderWindow.activateTexture(publicAPI);
    publicAPI.createTexture();
    publicAPI.bind();

    // Source texture data from the PBO.
    // model.context.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
    model.context.pixelStorei(model.context.UNPACK_ALIGNMENT, 1);
    if (useTexStorage(dataType)) {
      model.context.texStorage2D(model.target, 1, model.internalFormat, model.width, model.height);
      if (data != null) {
        model.context.texSubImage2D(model.target, 0, 0, 0, model.width, model.height, model.format, model.openGLDataType, data);
      }
    } else {
      model.context.texImage2D(model.target, 0, model.internalFormat, model.width, model.height, 0, model.format, model.openGLDataType, data);
    }
    if (model.generateMipmap) {
      model.context.generateMipmap(model.target);
    }
    model.allocatedGPUMemoryInBytes = model.width * model.height * model.depth * model.components * model._openGLRenderWindow.getDefaultTextureByteSize(dataType, getNorm16Ext(), publicAPI.useHalfFloat());
    publicAPI.deactivate();
    return true;
  };

  //----------------------------------------------------------------------------
  publicAPI.create2DFromImage = image => {
    // Now determine the texture parameters using the arguments.
    publicAPI.getOpenGLDataType(VtkDataTypes.UNSIGNED_CHAR);
    publicAPI.getInternalFormat(VtkDataTypes.UNSIGNED_CHAR, 4);
    publicAPI.getFormat(VtkDataTypes.UNSIGNED_CHAR, 4);
    if (!model.internalFormat || !model.format || !model.openGLDataType) {
      vtkErrorMacro('Failed to determine texture parameters.');
      return false;
    }
    model.target = model.context.TEXTURE_2D;
    model.components = 4;
    model.depth = 1;
    model.numberOfDimensions = 2;
    model._openGLRenderWindow.activateTexture(publicAPI);
    publicAPI.createTexture();
    publicAPI.bind();

    // Source texture data from the PBO.
    // model.context.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
    model.context.pixelStorei(model.context.UNPACK_ALIGNMENT, 1);

    // Scale up the texture to the next highest power of two dimensions (if needed) and flip y.
    const needNearestPowerOfTwo = !model._openGLRenderWindow.getWebgl2() && (!isPowerOfTwo(image.width) || !isPowerOfTwo(image.height));
    const canvas = document.createElement('canvas');
    canvas.width = needNearestPowerOfTwo ? nearestPowerOfTwo(image.width) : image.width;
    canvas.height = needNearestPowerOfTwo ? nearestPowerOfTwo(image.height) : image.height;
    model.width = canvas.width;
    model.height = canvas.height;
    const ctx = canvas.getContext('2d');
    ctx.translate(0, canvas.height);
    ctx.scale(1, -1);
    ctx.drawImage(image, 0, 0, image.width, image.height, 0, 0, canvas.width, canvas.height);
    const safeImage = canvas;
    if (useTexStorage(VtkDataTypes.UNSIGNED_CHAR)) {
      model.context.texStorage2D(model.target, 1, model.internalFormat, model.width, model.height);
      if (safeImage != null) {
        model.context.texSubImage2D(model.target, 0, 0, 0, model.width, model.height, model.format, model.openGLDataType, safeImage);
      }
    } else {
      model.context.texImage2D(model.target, 0, model.internalFormat, model.width, model.height, 0, model.format, model.openGLDataType, safeImage);
    }
    if (model.generateMipmap) {
      model.context.generateMipmap(model.target);
    }
    model.allocatedGPUMemoryInBytes = model.width * model.height * model.depth * model.components * model._openGLRenderWindow.getDefaultTextureByteSize(VtkDataTypes.UNSIGNED_CHAR, getNorm16Ext(), publicAPI.useHalfFloat());
    publicAPI.deactivate();
    return true;
  };

  // Compute scale and offset per component from min and max per component
  function computeScaleOffsets(min, max, numComps) {
    const offset = new Array(numComps);
    const scale = new Array(numComps);
    for (let c = 0; c < numComps; ++c) {
      offset[c] = min[c];
      scale[c] = max[c] - min[c] || 1.0;
    }
    return {
      scale,
      offset
    };
  }

  // HalfFloat only represents numbers between [-2048, 2048] exactly accurate,
  // for numbers outside of this range there is a precision limitation
  function hasExactHalfFloat(offset, scale) {
    // Per Component
    for (let c = 0; c < offset.length; c++) {
      const min = offset[c];
      const max = scale[c] + min;
      if (min < -2048 || min > 2048 || max < -2048 || max > 2048) {
        return false;
      }
    }
    return true;
  }
  function setCanUseHalfFloat(dataType, offset, scale, preferSizeOverAccuracy) {
    publicAPI.getOpenGLDataType(dataType);

    // Don't consider halfFloat and convert back to Float when the range of data does not generate an accurate halfFloat
    // AND it is not preferable to have a smaller texture than an exact texture.
    const isExactHalfFloat = hasExactHalfFloat(offset, scale) || preferSizeOverAccuracy;
    let useHalfFloat = false;
    if (model._openGLRenderWindow.getWebgl2()) {
      // If OES_texture_float_linear is not available, and using a half float would still be exact, force half floats
      // This is because half floats are always texture filterable in webgl2, while full *32F floats are not (unless the extension is present)
      const forceHalfFloat = model.openGLDataType === model.context.FLOAT && model.context.getExtension('OES_texture_float_linear') === null && isExactHalfFloat;
      useHalfFloat = forceHalfFloat || model.openGLDataType === model.context.HALF_FLOAT;
    } else {
      const halfFloatExt = model.context.getExtension('OES_texture_half_float');
      useHalfFloat = halfFloatExt && model.openGLDataType === halfFloatExt.HALF_FLOAT_OES;
    }
    model.canUseHalfFloat = useHalfFloat && isExactHalfFloat;
  }
  function processDataArray(dataArray, preferSizeOverAccuracy) {
    const numComps = dataArray.getNumberOfComponents();
    const dataType = dataArray.getDataType();
    const data = dataArray.getData();

    // Compute min max from array
    // Using the vtkDataArray.getRange() enables caching
    const minArray = new Array(numComps);
    const maxArray = new Array(numComps);
    for (let c = 0; c < numComps; ++c) {
      const [min, max] = dataArray.getRange(c);
      minArray[c] = min;
      maxArray[c] = max;
    }
    const scaleOffsets = computeScaleOffsets(minArray, maxArray, numComps);

    // preferSizeOverAccuracy will override norm16 due to bug with norm16 implementation
    // https://bugs.chromium.org/p/chromium/issues/detail?id=1408247
    setCanUseHalfFloat(dataType, scaleOffsets.offset, scaleOffsets.scale, preferSizeOverAccuracy);

    // since our default is to use half float, in case that we can't use it
    // we need to use another type
    if (!publicAPI.useHalfFloat()) {
      publicAPI.getOpenGLDataType(dataType, true);
    }
    return {
      numComps,
      dataType,
      data,
      scaleOffsets
    };
  }
  publicAPI.create2DFilterableFromRaw = function (width, height, numberOfComponents, dataType, values) {
    let preferSizeOverAccuracy = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : false;
    return publicAPI.create2DFilterableFromDataArray(width, height, vtkDataArray.newInstance({
      numberOfComponents,
      dataType,
      values
    }), preferSizeOverAccuracy);
  };
  publicAPI.create2DFilterableFromDataArray = function (width, height, dataArray) {
    let preferSizeOverAccuracy = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
    const {
      numComps,
      dataType,
      data
    } = processDataArray(dataArray, preferSizeOverAccuracy);
    publicAPI.create2DFromRaw(width, height, numComps, dataType, data);
  };
  publicAPI.updateVolumeInfoForGL = (dataType, numComps) => {
    let isScalingApplied = false;
    const useHalfFloat = publicAPI.useHalfFloat();

    // Initialize volume info if it doesn't exist
    if (!model.volumeInfo?.scale || !model.volumeInfo?.offset) {
      model.volumeInfo = {
        scale: new Array(numComps),
        offset: new Array(numComps)
      };
    }

    // Default scaling and offset
    for (let c = 0; c < numComps; ++c) {
      model.volumeInfo.scale[c] = 1.0;
      model.volumeInfo.offset[c] = 0.0;
    }

    // Handle SHORT data type with EXT_texture_norm16 extension
    if (getNorm16Ext() && !useHalfFloat && dataType === VtkDataTypes.SHORT) {
      for (let c = 0; c < numComps; ++c) {
        model.volumeInfo.scale[c] = 32767.0; // Scale to [-1, 1] range
      }

      isScalingApplied = true;
    }

    // Handle UNSIGNED_SHORT data type with EXT_texture_norm16 extension
    if (getNorm16Ext() && !useHalfFloat && dataType === VtkDataTypes.UNSIGNED_SHORT) {
      for (let c = 0; c < numComps; ++c) {
        model.volumeInfo.scale[c] = 65535.0; // Scale to [0, 1] range
      }

      isScalingApplied = true;
    }

    // Handle UNSIGNED_CHAR data type
    if (dataType === VtkDataTypes.UNSIGNED_CHAR) {
      for (let c = 0; c < numComps; ++c) {
        model.volumeInfo.scale[c] = 255.0; // Scale to [0, 1] range
      }

      isScalingApplied = true;
    }

    // No scaling needed for FLOAT or HalfFloat (SHORT/UNSIGNED_SHORT)
    if (dataType === VtkDataTypes.FLOAT || useHalfFloat && (dataType === VtkDataTypes.SHORT || dataType === VtkDataTypes.UNSIGNED_SHORT)) {
      isScalingApplied = true;
    }
    return isScalingApplied;
  };

  //----------------------------------------------------------------------------
  publicAPI.create3DFromRaw = (width, height, depth, numComps, dataType, data) => {
    let dataTypeToUse = dataType;
    let dataToUse = data;
    if (!publicAPI.updateVolumeInfoForGL(dataTypeToUse, numComps) && dataToUse) {
      const numPixelsIn = width * height * depth;
      const scaleOffsetsCopy = structuredClone(model.volumeInfo);
      // otherwise convert to float
      const newArray = new Float32Array(numPixelsIn * numComps);
      // use computed scale and offset
      model.volumeInfo.offset = scaleOffsetsCopy.offset;
      model.volumeInfo.scale = scaleOffsetsCopy.scale;
      let count = 0;
      const scaleInverse = scaleOffsetsCopy.scale.map(s => 1 / s);
      for (let i = 0; i < numPixelsIn; i++) {
        for (let nc = 0; nc < numComps; nc++) {
          newArray[count] = (dataToUse[count] - scaleOffsetsCopy.offset[nc]) * scaleInverse[nc];
          count++;
        }
      }
      dataTypeToUse = VtkDataTypes.FLOAT;
      dataToUse = newArray;
    }

    // Permit OpenGLDataType to be half float, if applicable, for 3D
    publicAPI.getOpenGLDataType(dataTypeToUse);

    // Now determine the texture parameters using the arguments.
    publicAPI.getInternalFormat(dataTypeToUse, numComps);
    publicAPI.getFormat(dataTypeToUse, numComps);
    if (!model.internalFormat || !model.format || !model.openGLDataType) {
      vtkErrorMacro('Failed to determine texture parameters.');
      return false;
    }
    model.target = model.context.TEXTURE_3D;
    model.components = numComps;
    model.width = width;
    model.height = height;
    model.depth = depth;
    model.numberOfDimensions = 3;
    model._openGLRenderWindow.activateTexture(publicAPI);
    publicAPI.createTexture();
    publicAPI.bind();
    // Create an array of texture with one texture
    const dataArray = [dataToUse];
    const is3DArray = true;
    const pixData = publicAPI.updateArrayDataTypeForGL(dataTypeToUse, dataArray, is3DArray);
    const scaledData = scaleTextureToHighestPowerOfTwo(pixData);

    // Source texture data from the PBO.
    // model.context.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
    model.context.pixelStorei(model.context.UNPACK_ALIGNMENT, 1);

    // openGLDataType

    if (useTexStorage(dataTypeToUse)) {
      model.context.texStorage3D(model.target, 1, model.internalFormat, model.width, model.height, model.depth);
      if (scaledData[0] != null) {
        model.context.texSubImage3D(model.target, 0, 0, 0, 0, model.width, model.height, model.depth, model.format, model.openGLDataType, scaledData[0]);
      }
    } else {
      model.context.texImage3D(model.target, 0, model.internalFormat, model.width, model.height, model.depth, 0, model.format, model.openGLDataType, scaledData[0]);
    }
    if (model.generateMipmap) {
      model.context.generateMipmap(model.target);
    }
    model.allocatedGPUMemoryInBytes = model.width * model.height * model.depth * model.components * model._openGLRenderWindow.getDefaultTextureByteSize(dataTypeToUse, getNorm16Ext(), publicAPI.useHalfFloat());
    publicAPI.deactivate();
    return true;
  };

  //----------------------------------------------------------------------------
  // This method simulates a 3D texture using 2D
  // Prefer create3DFilterableFromDataArray to enable caching of min and max values
  publicAPI.create3DFilterableFromRaw = function (width, height, depth, numberOfComponents, dataType, values) {
    let preferSizeOverAccuracy = arguments.length > 6 && arguments[6] !== undefined ? arguments[6] : false;
    return publicAPI.create3DFilterableFromDataArray(width, height, depth, vtkDataArray.newInstance({
      numberOfComponents,
      dataType,
      values
    }), preferSizeOverAccuracy);
  };

  //----------------------------------------------------------------------------
  // This method create a 3D texture from dimensions and a DataArray
  publicAPI.create3DFilterableFromDataArray = function (width, height, depth, dataArray) {
    let preferSizeOverAccuracy = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
    const {
      numComps,
      dataType,
      data,
      scaleOffsets
    } = processDataArray(dataArray, preferSizeOverAccuracy);
    const offset = [];
    const scale = [];
    for (let c = 0; c < numComps; ++c) {
      offset[c] = 0.0;
      scale[c] = 1.0;
    }

    // store the information, we will need it later
    // offset and scale are the offset and scale required to get
    // the texture value back to data values ala
    // data = texture * scale + offset
    // and texture = (data - offset)/scale
    model.volumeInfo = {
      scale,
      offset,
      dataComputedScale: scaleOffsets.scale,
      dataComputedOffset: scaleOffsets.offset,
      width,
      height,
      depth
    };

    // Create a copy of scale and offset to avoid aliasing issues
    // Original is read only, copy is read/write
    // Use the copy as volumeInfo.scale and volumeInfo.offset

    // WebGL2 path, we have 3d textures etc
    if (model._openGLRenderWindow.getWebgl2()) {
      return publicAPI.create3DFromRaw(width, height, depth, numComps, dataType, data);
    }
    const numPixelsIn = width * height * depth;
    const scaleOffsetsCopy = structuredClone(scaleOffsets);

    // not webgl2, deal with webgl1, no 3d textures
    // and maybe no float textures

    let volCopyData = (outArray, outIdx, inValue, smin, smax) => {
      outArray[outIdx] = inValue;
    };
    let dataTypeToUse = VtkDataTypes.UNSIGNED_CHAR;
    // unsigned char gets used as is
    if (dataType === VtkDataTypes.UNSIGNED_CHAR) {
      for (let c = 0; c < numComps; ++c) {
        scaleOffsetsCopy.offset[c] = 0.0;
        scaleOffsetsCopy.scale[c] = 255.0;
      }
    } else if (model.context.getExtension('OES_texture_float') && model.context.getExtension('OES_texture_float_linear')) {
      // use float textures scaled to 0.0 to 1.0
      dataTypeToUse = VtkDataTypes.FLOAT;
      volCopyData = (outArray, outIdx, inValue, soffset, sscale) => {
        outArray[outIdx] = (inValue - soffset) / sscale;
      };
    } else {
      // worst case, scale data to uchar
      dataTypeToUse = VtkDataTypes.UNSIGNED_CHAR;
      volCopyData = (outArray, outIdx, inValue, soffset, sscale) => {
        outArray[outIdx] = 255.0 * (inValue - soffset) / sscale;
      };
    }

    // Now determine the texture parameters using the arguments.
    publicAPI.getOpenGLDataType(dataTypeToUse);
    publicAPI.getInternalFormat(dataTypeToUse, numComps);
    publicAPI.getFormat(dataTypeToUse, numComps);
    if (!model.internalFormat || !model.format || !model.openGLDataType) {
      vtkErrorMacro('Failed to determine texture parameters.');
      return false;
    }

    // have to pack this 3D texture into pot 2D texture
    model.target = model.context.TEXTURE_2D;
    model.components = numComps;
    model.depth = 1;
    model.numberOfDimensions = 2;

    // MAX_TEXTURE_SIZE gives the max dimensions that can be supported by the GPU,
    // but it doesn't mean it will fit in memory. If we have to use a float data type
    // or 4 components, there are good chances that the texture size will blow up
    // and could not fit in the GPU memory. Use a smaller texture size in that case,
    // which will force a downsampling of the dataset.
    // That problem does not occur when using webGL2 since we can pack the data in
    // denser textures based on our data type.
    // TODO: try to fit in the biggest supported texture, catch the gl error if it
    // does not fix (OUT_OF_MEMORY), then attempt with smaller texture
    let maxTexDim = model.context.getParameter(model.context.MAX_TEXTURE_SIZE);
    if (maxTexDim > 4096 && (dataTypeToUse === VtkDataTypes.FLOAT || numComps >= 3)) {
      maxTexDim = 4096;
    }

    // compute estimate for XY subsample
    let xstride = 1;
    let ystride = 1;
    if (numPixelsIn > maxTexDim * maxTexDim) {
      xstride = Math.ceil(Math.sqrt(numPixelsIn / (maxTexDim * maxTexDim)));
      ystride = xstride;
    }
    let targetWidth = Math.sqrt(numPixelsIn) / xstride;
    targetWidth = nearestPowerOfTwo(targetWidth);
    // determine X reps
    const xreps = Math.floor(targetWidth * xstride / width);
    const yreps = Math.ceil(depth / xreps);
    const targetHeight = nearestPowerOfTwo(height * yreps / ystride);
    model.width = targetWidth;
    model.height = targetHeight;
    model._openGLRenderWindow.activateTexture(publicAPI);
    publicAPI.createTexture();
    publicAPI.bind();

    // store the information, we will need it later
    model.volumeInfo.xreps = xreps;
    model.volumeInfo.yreps = yreps;
    model.volumeInfo.xstride = xstride;
    model.volumeInfo.ystride = ystride;
    model.volumeInfo.offset = scaleOffsetsCopy.offset;
    model.volumeInfo.scale = scaleOffsetsCopy.scale;

    // OK stuff the data into the 2d TEXTURE

    // first allocate the new texture
    let newArray;
    const pixCount = targetWidth * targetHeight * numComps;
    if (dataTypeToUse === VtkDataTypes.FLOAT) {
      newArray = new Float32Array(pixCount);
    } else {
      newArray = new Uint8Array(pixCount);
    }

    // then stuff the data into it, nothing fancy right now
    // for stride
    let outIdx = 0;
    const tileWidth = Math.floor(width / xstride);
    const tileHeight = Math.floor(height / ystride);
    for (let yRep = 0; yRep < yreps; yRep++) {
      const xrepsThisRow = Math.min(xreps, depth - yRep * xreps);
      const outXContIncr = numComps * (model.width - xrepsThisRow * Math.floor(width / xstride));
      for (let tileY = 0; tileY < tileHeight; tileY++) {
        for (let xRep = 0; xRep < xrepsThisRow; xRep++) {
          const inOffset = numComps * ((yRep * xreps + xRep) * width * height + ystride * tileY * width);
          for (let tileX = 0; tileX < tileWidth; tileX++) {
            // copy value
            for (let nc = 0; nc < numComps; nc++) {
              volCopyData(newArray, outIdx, data[inOffset + xstride * tileX * numComps + nc], scaleOffsetsCopy.offset[nc], scaleOffsetsCopy.scale[nc]);
              outIdx++;
            }
          }
        }
        outIdx += outXContIncr;
      }
    }

    // Source texture data from the PBO.
    // model.context.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
    model.context.pixelStorei(model.context.UNPACK_ALIGNMENT, 1);
    if (useTexStorage(dataTypeToUse)) {
      model.context.texStorage2D(model.target, 1, model.internalFormat, model.width, model.height);
      if (newArray != null) {
        model.context.texSubImage2D(model.target, 0, 0, 0, model.width, model.height, model.format, model.openGLDataType, newArray);
      }
    } else {
      model.context.texImage2D(model.target, 0, model.internalFormat, model.width, model.height, 0, model.format, model.openGLDataType, newArray);
    }
    publicAPI.deactivate();
    return true;
  };
  publicAPI.setOpenGLRenderWindow = rw => {
    if (model._openGLRenderWindow === rw) {
      return;
    }
    publicAPI.releaseGraphicsResources();
    model._openGLRenderWindow = rw;
    model.context = null;
    if (rw) {
      model.context = model._openGLRenderWindow.getContext();
    }
  };

  //----------------------------------------------------------------------------
  publicAPI.getMaximumTextureSize = ctx => {
    if (ctx && ctx.isCurrent()) {
      return ctx.getIntegerv(ctx.MAX_TEXTURE_SIZE);
    }
    return -1;
  };

  // set use half float
  publicAPI.enableUseHalfFloat = use => {
    model.enableUseHalfFloat = use;
  };
}

// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {
  _openGLRenderWindow: null,
  _forceInternalFormat: false,
  context: null,
  handle: 0,
  sendParametersTime: null,
  textureBuildTime: null,
  numberOfDimensions: 0,
  target: 0,
  format: 0,
  openGLDataType: 0,
  components: 0,
  width: 0,
  height: 0,
  depth: 0,
  autoParameters: true,
  wrapS: Wrap.CLAMP_TO_EDGE,
  wrapT: Wrap.CLAMP_TO_EDGE,
  wrapR: Wrap.CLAMP_TO_EDGE,
  minificationFilter: Filter.NEAREST,
  magnificationFilter: Filter.NEAREST,
  minLOD: -1000.0,
  maxLOD: 1000.0,
  baseLevel: 0,
  maxLevel: 1000,
  generateMipmap: false,
  oglNorm16Ext: null,
  allocatedGPUMemoryInBytes: 0,
  // by default it is enabled
  enableUseHalfFloat: true,
  // but by default we don't know if we can use half float base on the data range
  canUseHalfFloat: false
};

// ----------------------------------------------------------------------------

function extend(publicAPI, model) {
  let initialValues = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  Object.assign(model, DEFAULT_VALUES, initialValues);

  // Inheritance
  vtkViewNode.extend(publicAPI, model, initialValues);
  model.sendParametersTime = {};
  obj(model.sendParametersTime, {
    mtime: 0
  });
  model.textureBuildTime = {};
  obj(model.textureBuildTime, {
    mtime: 0
  });

  // Build VTK API
  set(publicAPI, model, ['format', 'openGLDataType']);
  setGet(publicAPI, model, ['keyMatrixTime', 'minificationFilter', 'magnificationFilter', 'wrapS', 'wrapT', 'wrapR', 'generateMipmap', 'oglNorm16Ext']);
  get(publicAPI, model, ['width', 'height', 'volumeInfo', 'components', 'handle', 'target', 'allocatedGPUMemoryInBytes']);
  moveToProtected(publicAPI, model, ['openGLRenderWindow']);

  // Object methods
  vtkOpenGLTexture(publicAPI, model);
}

// ----------------------------------------------------------------------------

const newInstance = newInstance$1(extend, 'vtkOpenGLTexture');

// ----------------------------------------------------------------------------

var vtkOpenGLTexture$1 = {
  newInstance,
  extend,
  ...Constants
};

// Register ourself to OpenGL backend if imported
registerOverride('vtkTexture', newInstance);

export { vtkOpenGLTexture$1 as default, extend, newInstance };