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immErfanrajabee/bd / node_modules /three /src /renderers /webgl /WebGLTextures.js
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import { LinearFilter, LinearMipmapLinearFilter, LinearMipmapNearestFilter, NearestFilter, NearestMipmapLinearFilter, NearestMipmapNearestFilter, RGBAFormat, DepthFormat, DepthStencilFormat, UnsignedIntType, FloatType, MirroredRepeatWrapping, ClampToEdgeWrapping, RepeatWrapping, UnsignedByteType, NoColorSpace, LinearSRGBColorSpace, NeverCompare, AlwaysCompare, LessCompare, LessEqualCompare, EqualCompare, GreaterEqualCompare, GreaterCompare, NotEqualCompare, SRGBTransfer, LinearTransfer, UnsignedShortType, UnsignedInt248Type } from '../../constants.js';
import { createElementNS } from '../../utils.js';
import { ColorManagement } from '../../math/ColorManagement.js';
import { Vector2 } from '../../math/Vector2.js';
import { getByteLength } from '../../extras/TextureUtils.js';
function WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info ) {
const multisampledRTTExt = extensions.has( 'WEBGL_multisampled_render_to_texture' ) ? extensions.get( 'WEBGL_multisampled_render_to_texture' ) : null;
 const supportsInvalidateFramebuffer = typeof navigator === 'undefined' ? false : /OculusBrowser/g.test( navigator.userAgent );
const _imageDimensions = new Vector2();
 const _videoTextures = new WeakMap();
 let _canvas;
const _sources = new WeakMap(); // maps WebglTexture objects to instances of Source
// cordova iOS (as of 5.0) still uses UIWebView, which provides OffscreenCanvas,
 // also OffscreenCanvas.getContext("webgl"), but not OffscreenCanvas.getContext("2d")!
 // Some implementations may only implement OffscreenCanvas partially (e.g. lacking 2d).
let useOffscreenCanvas = false;
try {
useOffscreenCanvas = typeof OffscreenCanvas !== 'undefined'
 // eslint-disable-next-line compat/compat
 && ( new OffscreenCanvas( 1, 1 ).getContext( '2d' ) ) !== null;
} catch ( err ) {
// Ignore any errors
}
function createCanvas( width, height ) {
// Use OffscreenCanvas when available. Specially needed in web workers
return useOffscreenCanvas ?
 // eslint-disable-next-line compat/compat
 new OffscreenCanvas( width, height ) : createElementNS( 'canvas' );
}
function resizeImage( image, needsNewCanvas, maxSize ) {
let scale = 1;
const dimensions = getDimensions( image );
// handle case if texture exceeds max size
if ( dimensions.width > maxSize || dimensions.height > maxSize ) {
scale = maxSize / Math.max( dimensions.width, dimensions.height );
}
// only perform resize if necessary
if ( scale < 1 ) {
// only perform resize for certain image types
if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||
 ( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||
 ( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ||
 ( typeof VideoFrame !== 'undefined' && image instanceof VideoFrame ) ) {
const width = Math.floor( scale * dimensions.width );
 const height = Math.floor( scale * dimensions.height );
if ( _canvas === undefined ) _canvas = createCanvas( width, height );
// cube textures can't reuse the same canvas
const canvas = needsNewCanvas ? createCanvas( width, height ) : _canvas;
canvas.width = width;
 canvas.height = height;
const context = canvas.getContext( '2d' );
 context.drawImage( image, 0, 0, width, height );
console.warn( 'THREE.WebGLRenderer: Texture has been resized from (' + dimensions.width + 'x' + dimensions.height + ') to (' + width + 'x' + height + ').' );
return canvas;
} else {
if ( 'data' in image ) {
console.warn( 'THREE.WebGLRenderer: Image in DataTexture is too big (' + dimensions.width + 'x' + dimensions.height + ').' );
}
return image;
}
}
return image;
}
function textureNeedsGenerateMipmaps( texture ) {
return texture.generateMipmaps;
}
function generateMipmap( target ) {
_gl.generateMipmap( target );
}
function getTargetType( texture ) {
if ( texture.isWebGLCubeRenderTarget ) return _gl.TEXTURE_CUBE_MAP;
 if ( texture.isWebGL3DRenderTarget ) return _gl.TEXTURE_3D;
 if ( texture.isWebGLArrayRenderTarget || texture.isCompressedArrayTexture ) return _gl.TEXTURE_2D_ARRAY;
 return _gl.TEXTURE_2D;
}
function getInternalFormat( internalFormatName, glFormat, glType, colorSpace, forceLinearTransfer = false ) {
if ( internalFormatName !== null ) {
if ( _gl[ internalFormatName ] !== undefined ) return _gl[ internalFormatName ];
console.warn( 'THREE.WebGLRenderer: Attempt to use non-existing WebGL internal format \'' + internalFormatName + '\'' );
}
let internalFormat = glFormat;
if ( glFormat === _gl.RED ) {
if ( glType === _gl.FLOAT ) internalFormat = _gl.R32F;
 if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.R16F;
 if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.R8;
}
if ( glFormat === _gl.RED_INTEGER ) {
if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.R8UI;
 if ( glType === _gl.UNSIGNED_SHORT ) internalFormat = _gl.R16UI;
 if ( glType === _gl.UNSIGNED_INT ) internalFormat = _gl.R32UI;
 if ( glType === _gl.BYTE ) internalFormat = _gl.R8I;
 if ( glType === _gl.SHORT ) internalFormat = _gl.R16I;
 if ( glType === _gl.INT ) internalFormat = _gl.R32I;
}
if ( glFormat === _gl.RG ) {
if ( glType === _gl.FLOAT ) internalFormat = _gl.RG32F;
 if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.RG16F;
 if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.RG8;
}
if ( glFormat === _gl.RG_INTEGER ) {
if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.RG8UI;
 if ( glType === _gl.UNSIGNED_SHORT ) internalFormat = _gl.RG16UI;
 if ( glType === _gl.UNSIGNED_INT ) internalFormat = _gl.RG32UI;
 if ( glType === _gl.BYTE ) internalFormat = _gl.RG8I;
 if ( glType === _gl.SHORT ) internalFormat = _gl.RG16I;
 if ( glType === _gl.INT ) internalFormat = _gl.RG32I;
}
if ( glFormat === _gl.RGB_INTEGER ) {
if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.RGB8UI;
 if ( glType === _gl.UNSIGNED_SHORT ) internalFormat = _gl.RGB16UI;
 if ( glType === _gl.UNSIGNED_INT ) internalFormat = _gl.RGB32UI;
 if ( glType === _gl.BYTE ) internalFormat = _gl.RGB8I;
 if ( glType === _gl.SHORT ) internalFormat = _gl.RGB16I;
 if ( glType === _gl.INT ) internalFormat = _gl.RGB32I;
}
if ( glFormat === _gl.RGBA_INTEGER ) {
if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.RGBA8UI;
 if ( glType === _gl.UNSIGNED_SHORT ) internalFormat = _gl.RGBA16UI;
 if ( glType === _gl.UNSIGNED_INT ) internalFormat = _gl.RGBA32UI;
 if ( glType === _gl.BYTE ) internalFormat = _gl.RGBA8I;
 if ( glType === _gl.SHORT ) internalFormat = _gl.RGBA16I;
 if ( glType === _gl.INT ) internalFormat = _gl.RGBA32I;
}
if ( glFormat === _gl.RGB ) {
if ( glType === _gl.UNSIGNED_INT_5_9_9_9_REV ) internalFormat = _gl.RGB9_E5;
}
if ( glFormat === _gl.RGBA ) {
const transfer = forceLinearTransfer ? LinearTransfer : ColorManagement.getTransfer( colorSpace );
if ( glType === _gl.FLOAT ) internalFormat = _gl.RGBA32F;
 if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.RGBA16F;
 if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = ( transfer === SRGBTransfer ) ? _gl.SRGB8_ALPHA8 : _gl.RGBA8;
 if ( glType === _gl.UNSIGNED_SHORT_4_4_4_4 ) internalFormat = _gl.RGBA4;
 if ( glType === _gl.UNSIGNED_SHORT_5_5_5_1 ) internalFormat = _gl.RGB5_A1;
}
if ( internalFormat === _gl.R16F || internalFormat === _gl.R32F ||
 internalFormat === _gl.RG16F || internalFormat === _gl.RG32F ||
 internalFormat === _gl.RGBA16F || internalFormat === _gl.RGBA32F ) {
extensions.get( 'EXT_color_buffer_float' );
}
return internalFormat;
}
function getInternalDepthFormat( useStencil, depthType ) {
let glInternalFormat;
 if ( useStencil ) {
if ( depthType === null || depthType === UnsignedIntType || depthType === UnsignedInt248Type ) {
glInternalFormat = _gl.DEPTH24_STENCIL8;
} else if ( depthType === FloatType ) {
glInternalFormat = _gl.DEPTH32F_STENCIL8;
} else if ( depthType === UnsignedShortType ) {
glInternalFormat = _gl.DEPTH24_STENCIL8;
 console.warn( 'DepthTexture: 16 bit depth attachment is not supported with stencil. Using 24-bit attachment.' );
}
} else {
if ( depthType === null || depthType === UnsignedIntType || depthType === UnsignedInt248Type ) {
glInternalFormat = _gl.DEPTH_COMPONENT24;
} else if ( depthType === FloatType ) {
glInternalFormat = _gl.DEPTH_COMPONENT32F;
} else if ( depthType === UnsignedShortType ) {
glInternalFormat = _gl.DEPTH_COMPONENT16;
}
}
return glInternalFormat;
}
function getMipLevels( texture, image ) {
if ( textureNeedsGenerateMipmaps( texture ) === true || ( texture.isFramebufferTexture && texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter ) ) {
return Math.log2( Math.max( image.width, image.height ) ) + 1;
} else if ( texture.mipmaps !== undefined && texture.mipmaps.length > 0 ) {
// user-defined mipmaps
return texture.mipmaps.length;
} else if ( texture.isCompressedTexture && Array.isArray( texture.image ) ) {
return image.mipmaps.length;
} else {
// texture without mipmaps (only base level)
return 1;
}
}
//
function onTextureDispose( event ) {
const texture = event.target;
texture.removeEventListener( 'dispose', onTextureDispose );
deallocateTexture( texture );
if ( texture.isVideoTexture ) {
_videoTextures.delete( texture );
}
}
function onRenderTargetDispose( event ) {
const renderTarget = event.target;
renderTarget.removeEventListener( 'dispose', onRenderTargetDispose );
deallocateRenderTarget( renderTarget );
}
//
function deallocateTexture( texture ) {
const textureProperties = properties.get( texture );
if ( textureProperties.__webglInit === undefined ) return;
// check if it's necessary to remove the WebGLTexture object
const source = texture.source;
 const webglTextures = _sources.get( source );
if ( webglTextures ) {
const webglTexture = webglTextures[ textureProperties.__cacheKey ];
 webglTexture.usedTimes --;
// the WebGLTexture object is not used anymore, remove it
if ( webglTexture.usedTimes === 0 ) {
deleteTexture( texture );
}
// remove the weak map entry if no WebGLTexture uses the source anymore
if ( Object.keys( webglTextures ).length === 0 ) {
_sources.delete( source );
}
}
properties.remove( texture );
}
function deleteTexture( texture ) {
const textureProperties = properties.get( texture );
 _gl.deleteTexture( textureProperties.__webglTexture );
const source = texture.source;
 const webglTextures = _sources.get( source );
 delete webglTextures[ textureProperties.__cacheKey ];
info.memory.textures --;
}
function deallocateRenderTarget( renderTarget ) {
const renderTargetProperties = properties.get( renderTarget );
if ( renderTarget.depthTexture ) {
renderTarget.depthTexture.dispose();
properties.remove( renderTarget.depthTexture );
}
if ( renderTarget.isWebGLCubeRenderTarget ) {
for ( let i = 0; i < 6; i ++ ) {
if ( Array.isArray( renderTargetProperties.__webglFramebuffer[ i ] ) ) {
for ( let level = 0; level < renderTargetProperties.__webglFramebuffer[ i ].length; level ++ ) _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ][ level ] );
} else {
_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ] );
}
if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer[ i ] );
}
} else {
if ( Array.isArray( renderTargetProperties.__webglFramebuffer ) ) {
for ( let level = 0; level < renderTargetProperties.__webglFramebuffer.length; level ++ ) _gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ level ] );
} else {
_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer );
}
if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer );
 if ( renderTargetProperties.__webglMultisampledFramebuffer ) _gl.deleteFramebuffer( renderTargetProperties.__webglMultisampledFramebuffer );
if ( renderTargetProperties.__webglColorRenderbuffer ) {
for ( let i = 0; i < renderTargetProperties.__webglColorRenderbuffer.length; i ++ ) {
if ( renderTargetProperties.__webglColorRenderbuffer[ i ] ) _gl.deleteRenderbuffer( renderTargetProperties.__webglColorRenderbuffer[ i ] );
}
}
if ( renderTargetProperties.__webglDepthRenderbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthRenderbuffer );
}
const textures = renderTarget.textures;
for ( let i = 0, il = textures.length; i < il; i ++ ) {
const attachmentProperties = properties.get( textures[ i ] );
if ( attachmentProperties.__webglTexture ) {
_gl.deleteTexture( attachmentProperties.__webglTexture );
info.memory.textures --;
}
properties.remove( textures[ i ] );
}
properties.remove( renderTarget );
}
//
let textureUnits = 0;
function resetTextureUnits() {
textureUnits = 0;
}
function allocateTextureUnit() {
const textureUnit = textureUnits;
if ( textureUnit >= capabilities.maxTextures ) {
console.warn( 'THREE.WebGLTextures: Trying to use ' + textureUnit + ' texture units while this GPU supports only ' + capabilities.maxTextures );
}
textureUnits += 1;
return textureUnit;
}
function getTextureCacheKey( texture ) {
const array = [];
array.push( texture.wrapS );
 array.push( texture.wrapT );
 array.push( texture.wrapR || 0 );
 array.push( texture.magFilter );
 array.push( texture.minFilter );
 array.push( texture.anisotropy );
 array.push( texture.internalFormat );
 array.push( texture.format );
 array.push( texture.type );
 array.push( texture.generateMipmaps );
 array.push( texture.premultiplyAlpha );
 array.push( texture.flipY );
 array.push( texture.unpackAlignment );
 array.push( texture.colorSpace );
return array.join();
}
//
function setTexture2D( texture, slot ) {
const textureProperties = properties.get( texture );
if ( texture.isVideoTexture ) updateVideoTexture( texture );
if ( texture.isRenderTargetTexture === false && texture.version > 0 && textureProperties.__version !== texture.version ) {
const image = texture.image;
if ( image === null ) {
console.warn( 'THREE.WebGLRenderer: Texture marked for update but no image data found.' );
} else if ( image.complete === false ) {
console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is incomplete' );
} else {
uploadTexture( textureProperties, texture, slot );
 return;
}
}
state.bindTexture( _gl.TEXTURE_2D, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );
}
function setTexture2DArray( texture, slot ) {
const textureProperties = properties.get( texture );
if ( texture.version > 0 && textureProperties.__version !== texture.version ) {
uploadTexture( textureProperties, texture, slot );
 return;
}
state.bindTexture( _gl.TEXTURE_2D_ARRAY, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );
}
function setTexture3D( texture, slot ) {
const textureProperties = properties.get( texture );
if ( texture.version > 0 && textureProperties.__version !== texture.version ) {
uploadTexture( textureProperties, texture, slot );
 return;
}
state.bindTexture( _gl.TEXTURE_3D, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );
}
function setTextureCube( texture, slot ) {
const textureProperties = properties.get( texture );
if ( texture.version > 0 && textureProperties.__version !== texture.version ) {
uploadCubeTexture( textureProperties, texture, slot );
 return;
}
state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );
}
const wrappingToGL = {
 [ RepeatWrapping ]: _gl.REPEAT,
 [ ClampToEdgeWrapping ]: _gl.CLAMP_TO_EDGE,
 [ MirroredRepeatWrapping ]: _gl.MIRRORED_REPEAT
 };
const filterToGL = {
 [ NearestFilter ]: _gl.NEAREST,
 [ NearestMipmapNearestFilter ]: _gl.NEAREST_MIPMAP_NEAREST,
 [ NearestMipmapLinearFilter ]: _gl.NEAREST_MIPMAP_LINEAR,
[ LinearFilter ]: _gl.LINEAR,
 [ LinearMipmapNearestFilter ]: _gl.LINEAR_MIPMAP_NEAREST,
 [ LinearMipmapLinearFilter ]: _gl.LINEAR_MIPMAP_LINEAR
 };
const compareToGL = {
 [ NeverCompare ]: _gl.NEVER,
 [ AlwaysCompare ]: _gl.ALWAYS,
 [ LessCompare ]: _gl.LESS,
 [ LessEqualCompare ]: _gl.LEQUAL,
 [ EqualCompare ]: _gl.EQUAL,
 [ GreaterEqualCompare ]: _gl.GEQUAL,
 [ GreaterCompare ]: _gl.GREATER,
 [ NotEqualCompare ]: _gl.NOTEQUAL
 };
function setTextureParameters( textureType, texture ) {
if ( texture.type === FloatType && extensions.has( 'OES_texture_float_linear' ) === false &&
 ( texture.magFilter === LinearFilter || texture.magFilter === LinearMipmapNearestFilter || texture.magFilter === NearestMipmapLinearFilter || texture.magFilter === LinearMipmapLinearFilter ||
 texture.minFilter === LinearFilter || texture.minFilter === LinearMipmapNearestFilter || texture.minFilter === NearestMipmapLinearFilter || texture.minFilter === LinearMipmapLinearFilter ) ) {
console.warn( 'THREE.WebGLRenderer: Unable to use linear filtering with floating point textures. OES_texture_float_linear not supported on this device.' );
}
_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, wrappingToGL[ texture.wrapS ] );
 _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, wrappingToGL[ texture.wrapT ] );
if ( textureType === _gl.TEXTURE_3D || textureType === _gl.TEXTURE_2D_ARRAY ) {
_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_R, wrappingToGL[ texture.wrapR ] );
}
_gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, filterToGL[ texture.magFilter ] );
 _gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, filterToGL[ texture.minFilter ] );
if ( texture.compareFunction ) {
_gl.texParameteri( textureType, _gl.TEXTURE_COMPARE_MODE, _gl.COMPARE_REF_TO_TEXTURE );
 _gl.texParameteri( textureType, _gl.TEXTURE_COMPARE_FUNC, compareToGL[ texture.compareFunction ] );
}
if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {
if ( texture.magFilter === NearestFilter ) return;
 if ( texture.minFilter !== NearestMipmapLinearFilter && texture.minFilter !== LinearMipmapLinearFilter ) return;
 if ( texture.type === FloatType && extensions.has( 'OES_texture_float_linear' ) === false ) return; // verify extension
if ( texture.anisotropy > 1 || properties.get( texture ).__currentAnisotropy ) {
const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
 _gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, capabilities.getMaxAnisotropy() ) );
 properties.get( texture ).__currentAnisotropy = texture.anisotropy;
}
}
}
function initTexture( textureProperties, texture ) {
let forceUpload = false;
if ( textureProperties.__webglInit === undefined ) {
textureProperties.__webglInit = true;
texture.addEventListener( 'dispose', onTextureDispose );
}
// create Source <-> WebGLTextures mapping if necessary
const source = texture.source;
 let webglTextures = _sources.get( source );
if ( webglTextures === undefined ) {
webglTextures = {};
 _sources.set( source, webglTextures );
}
// check if there is already a WebGLTexture object for the given texture parameters
const textureCacheKey = getTextureCacheKey( texture );
if ( textureCacheKey !== textureProperties.__cacheKey ) {
// if not, create a new instance of WebGLTexture
if ( webglTextures[ textureCacheKey ] === undefined ) {
// create new entry
webglTextures[ textureCacheKey ] = {
 texture: _gl.createTexture(),
 usedTimes: 0
 };
info.memory.textures ++;
// when a new instance of WebGLTexture was created, a texture upload is required
 // even if the image contents are identical
forceUpload = true;
}
webglTextures[ textureCacheKey ].usedTimes ++;
// every time the texture cache key changes, it's necessary to check if an instance of
 // WebGLTexture can be deleted in order to avoid a memory leak.
const webglTexture = webglTextures[ textureProperties.__cacheKey ];
if ( webglTexture !== undefined ) {
webglTextures[ textureProperties.__cacheKey ].usedTimes --;
if ( webglTexture.usedTimes === 0 ) {
deleteTexture( texture );
}
}
// store references to cache key and WebGLTexture object
textureProperties.__cacheKey = textureCacheKey;
 textureProperties.__webglTexture = webglTextures[ textureCacheKey ].texture;
}
return forceUpload;
}
function uploadTexture( textureProperties, texture, slot ) {
let textureType = _gl.TEXTURE_2D;
if ( texture.isDataArrayTexture || texture.isCompressedArrayTexture ) textureType = _gl.TEXTURE_2D_ARRAY;
 if ( texture.isData3DTexture ) textureType = _gl.TEXTURE_3D;
const forceUpload = initTexture( textureProperties, texture );
 const source = texture.source;
state.bindTexture( textureType, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );
const sourceProperties = properties.get( source );
if ( source.version !== sourceProperties.__version || forceUpload === true ) {
state.activeTexture( _gl.TEXTURE0 + slot );
const workingPrimaries = ColorManagement.getPrimaries( ColorManagement.workingColorSpace );
 const texturePrimaries = texture.colorSpace === NoColorSpace ? null : ColorManagement.getPrimaries( texture.colorSpace );
 const unpackConversion = texture.colorSpace === NoColorSpace || workingPrimaries === texturePrimaries ? _gl.NONE : _gl.BROWSER_DEFAULT_WEBGL;
_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );
 _gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );
 _gl.pixelStorei( _gl.UNPACK_ALIGNMENT, texture.unpackAlignment );
 _gl.pixelStorei( _gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, unpackConversion );
let image = resizeImage( texture.image, false, capabilities.maxTextureSize );
 image = verifyColorSpace( texture, image );
const glFormat = utils.convert( texture.format, texture.colorSpace );
const glType = utils.convert( texture.type );
 let glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace, texture.isVideoTexture );
setTextureParameters( textureType, texture );
let mipmap;
 const mipmaps = texture.mipmaps;
const useTexStorage = ( texture.isVideoTexture !== true );
 const allocateMemory = ( sourceProperties.__version === undefined ) || ( forceUpload === true );
 const dataReady = source.dataReady;
 const levels = getMipLevels( texture, image );
if ( texture.isDepthTexture ) {
glInternalFormat = getInternalDepthFormat( texture.format === DepthStencilFormat, texture.type );
//
if ( allocateMemory ) {
if ( useTexStorage ) {
state.texStorage2D( _gl.TEXTURE_2D, 1, glInternalFormat, image.width, image.height );
} else {
state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, null );
}
}
} else if ( texture.isDataTexture ) {
// use manually created mipmaps if available
 // if there are no manual mipmaps
 // set 0 level mipmap and then use GL to generate other mipmap levels
if ( mipmaps.length > 0 ) {
if ( useTexStorage && allocateMemory ) {
state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, mipmaps[ 0 ].width, mipmaps[ 0 ].height );
}
for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {
mipmap = mipmaps[ i ];
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_2D, i, 0, 0, mipmap.width, mipmap.height, glFormat, glType, mipmap.data );
}
} else {
state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );
}
}
texture.generateMipmaps = false;
} else {
if ( useTexStorage ) {
if ( allocateMemory ) {
state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, image.width, image.height );
}
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_2D, 0, 0, 0, image.width, image.height, glFormat, glType, image.data );
}
} else {
state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, image.data );
}
}
} else if ( texture.isCompressedTexture ) {
if ( texture.isCompressedArrayTexture ) {
if ( useTexStorage && allocateMemory ) {
state.texStorage3D( _gl.TEXTURE_2D_ARRAY, levels, glInternalFormat, mipmaps[ 0 ].width, mipmaps[ 0 ].height, image.depth );
}
for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {
mipmap = mipmaps[ i ];
if ( texture.format !== RGBAFormat ) {
if ( glFormat !== null ) {
if ( useTexStorage ) {
if ( dataReady ) {
if ( texture.layerUpdates.size > 0 ) {
const layerByteLength = getByteLength( mipmap.width, mipmap.height, texture.format, texture.type );
for ( const layerIndex of texture.layerUpdates ) {
const layerData = mipmap.data.subarray(
 layerIndex * layerByteLength / mipmap.data.BYTES_PER_ELEMENT,
 ( layerIndex + 1 ) * layerByteLength / mipmap.data.BYTES_PER_ELEMENT
 );
 state.compressedTexSubImage3D( _gl.TEXTURE_2D_ARRAY, i, 0, 0, layerIndex, mipmap.width, mipmap.height, 1, glFormat, layerData );
}
texture.clearLayerUpdates();
} else {
state.compressedTexSubImage3D( _gl.TEXTURE_2D_ARRAY, i, 0, 0, 0, mipmap.width, mipmap.height, image.depth, glFormat, mipmap.data );
}
}
} else {
state.compressedTexImage3D( _gl.TEXTURE_2D_ARRAY, i, glInternalFormat, mipmap.width, mipmap.height, image.depth, 0, mipmap.data, 0, 0 );
}
} else {
console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()' );
}
} else {
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage3D( _gl.TEXTURE_2D_ARRAY, i, 0, 0, 0, mipmap.width, mipmap.height, image.depth, glFormat, glType, mipmap.data );
}
} else {
state.texImage3D( _gl.TEXTURE_2D_ARRAY, i, glInternalFormat, mipmap.width, mipmap.height, image.depth, 0, glFormat, glType, mipmap.data );
}
}
}
} else {
if ( useTexStorage && allocateMemory ) {
state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, mipmaps[ 0 ].width, mipmaps[ 0 ].height );
}
for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {
mipmap = mipmaps[ i ];
if ( texture.format !== RGBAFormat ) {
if ( glFormat !== null ) {
if ( useTexStorage ) {
if ( dataReady ) {
state.compressedTexSubImage2D( _gl.TEXTURE_2D, i, 0, 0, mipmap.width, mipmap.height, glFormat, mipmap.data );
}
} else {
state.compressedTexImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );
}
} else {
console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()' );
}
} else {
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_2D, i, 0, 0, mipmap.width, mipmap.height, glFormat, glType, mipmap.data );
}
} else {
state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );
}
}
}
}
} else if ( texture.isDataArrayTexture ) {
if ( useTexStorage ) {
if ( allocateMemory ) {
state.texStorage3D( _gl.TEXTURE_2D_ARRAY, levels, glInternalFormat, image.width, image.height, image.depth );
}
if ( dataReady ) {
if ( texture.layerUpdates.size > 0 ) {
const layerByteLength = getByteLength( image.width, image.height, texture.format, texture.type );
for ( const layerIndex of texture.layerUpdates ) {
const layerData = image.data.subarray(
 layerIndex * layerByteLength / image.data.BYTES_PER_ELEMENT,
 ( layerIndex + 1 ) * layerByteLength / image.data.BYTES_PER_ELEMENT
 );
 state.texSubImage3D( _gl.TEXTURE_2D_ARRAY, 0, 0, 0, layerIndex, image.width, image.height, 1, glFormat, glType, layerData );
}
texture.clearLayerUpdates();
} else {
state.texSubImage3D( _gl.TEXTURE_2D_ARRAY, 0, 0, 0, 0, image.width, image.height, image.depth, glFormat, glType, image.data );
}
}
} else {
state.texImage3D( _gl.TEXTURE_2D_ARRAY, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
}
} else if ( texture.isData3DTexture ) {
if ( useTexStorage ) {
if ( allocateMemory ) {
state.texStorage3D( _gl.TEXTURE_3D, levels, glInternalFormat, image.width, image.height, image.depth );
}
if ( dataReady ) {
state.texSubImage3D( _gl.TEXTURE_3D, 0, 0, 0, 0, image.width, image.height, image.depth, glFormat, glType, image.data );
}
} else {
state.texImage3D( _gl.TEXTURE_3D, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
}
} else if ( texture.isFramebufferTexture ) {
if ( allocateMemory ) {
if ( useTexStorage ) {
state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, image.width, image.height );
} else {
let width = image.width, height = image.height;
for ( let i = 0; i < levels; i ++ ) {
state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, width, height, 0, glFormat, glType, null );
width >>= 1;
 height >>= 1;
}
}
}
} else {
// regular Texture (image, video, canvas)
// use manually created mipmaps if available
 // if there are no manual mipmaps
 // set 0 level mipmap and then use GL to generate other mipmap levels
if ( mipmaps.length > 0 ) {
if ( useTexStorage && allocateMemory ) {
const dimensions = getDimensions( mipmaps[ 0 ] );
state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, dimensions.width, dimensions.height );
}
for ( let i = 0, il = mipmaps.length; i < il; i ++ ) {
mipmap = mipmaps[ i ];
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_2D, i, 0, 0, glFormat, glType, mipmap );
}
} else {
state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, glFormat, glType, mipmap );
}
}
texture.generateMipmaps = false;
} else {
if ( useTexStorage ) {
if ( allocateMemory ) {
const dimensions = getDimensions( image );
state.texStorage2D( _gl.TEXTURE_2D, levels, glInternalFormat, dimensions.width, dimensions.height );
}
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_2D, 0, 0, 0, glFormat, glType, image );
}
} else {
state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, glFormat, glType, image );
}
}
}
if ( textureNeedsGenerateMipmaps( texture ) ) {
generateMipmap( textureType );
}
sourceProperties.__version = source.version;
if ( texture.onUpdate ) texture.onUpdate( texture );
}
textureProperties.__version = texture.version;
}
function uploadCubeTexture( textureProperties, texture, slot ) {
if ( texture.image.length !== 6 ) return;
const forceUpload = initTexture( textureProperties, texture );
 const source = texture.source;
state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture, _gl.TEXTURE0 + slot );
const sourceProperties = properties.get( source );
if ( source.version !== sourceProperties.__version || forceUpload === true ) {
state.activeTexture( _gl.TEXTURE0 + slot );
const workingPrimaries = ColorManagement.getPrimaries( ColorManagement.workingColorSpace );
 const texturePrimaries = texture.colorSpace === NoColorSpace ? null : ColorManagement.getPrimaries( texture.colorSpace );
 const unpackConversion = texture.colorSpace === NoColorSpace || workingPrimaries === texturePrimaries ? _gl.NONE : _gl.BROWSER_DEFAULT_WEBGL;
_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );
 _gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );
 _gl.pixelStorei( _gl.UNPACK_ALIGNMENT, texture.unpackAlignment );
 _gl.pixelStorei( _gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, unpackConversion );
const isCompressed = ( texture.isCompressedTexture || texture.image[ 0 ].isCompressedTexture );
 const isDataTexture = ( texture.image[ 0 ] && texture.image[ 0 ].isDataTexture );
const cubeImage = [];
for ( let i = 0; i < 6; i ++ ) {
if ( ! isCompressed && ! isDataTexture ) {
cubeImage[ i ] = resizeImage( texture.image[ i ], true, capabilities.maxCubemapSize );
} else {
cubeImage[ i ] = isDataTexture ? texture.image[ i ].image : texture.image[ i ];
}
cubeImage[ i ] = verifyColorSpace( texture, cubeImage[ i ] );
}
const image = cubeImage[ 0 ],
 glFormat = utils.convert( texture.format, texture.colorSpace ),
 glType = utils.convert( texture.type ),
 glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace );
const useTexStorage = ( texture.isVideoTexture !== true );
 const allocateMemory = ( sourceProperties.__version === undefined ) || ( forceUpload === true );
 const dataReady = source.dataReady;
 let levels = getMipLevels( texture, image );
setTextureParameters( _gl.TEXTURE_CUBE_MAP, texture );
let mipmaps;
if ( isCompressed ) {
if ( useTexStorage && allocateMemory ) {
state.texStorage2D( _gl.TEXTURE_CUBE_MAP, levels, glInternalFormat, image.width, image.height );
}
for ( let i = 0; i < 6; i ++ ) {
mipmaps = cubeImage[ i ].mipmaps;
for ( let j = 0; j < mipmaps.length; j ++ ) {
const mipmap = mipmaps[ j ];
if ( texture.format !== RGBAFormat ) {
if ( glFormat !== null ) {
if ( useTexStorage ) {
if ( dataReady ) {
state.compressedTexSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, 0, 0, mipmap.width, mipmap.height, glFormat, mipmap.data );
}
} else {
state.compressedTexImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );
}
} else {
console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .setTextureCube()' );
}
} else {
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, 0, 0, mipmap.width, mipmap.height, glFormat, glType, mipmap.data );
}
} else {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );
}
}
}
}
} else {
mipmaps = texture.mipmaps;
if ( useTexStorage && allocateMemory ) {
// TODO: Uniformly handle mipmap definitions
 // Normal textures and compressed cube textures define base level + mips with their mipmap array
 // Uncompressed cube textures use their mipmap array only for mips (no base level)
if ( mipmaps.length > 0 ) levels ++;
const dimensions = getDimensions( cubeImage[ 0 ] );
state.texStorage2D( _gl.TEXTURE_CUBE_MAP, levels, glInternalFormat, dimensions.width, dimensions.height );
}
for ( let i = 0; i < 6; i ++ ) {
if ( isDataTexture ) {
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 0, 0, cubeImage[ i ].width, cubeImage[ i ].height, glFormat, glType, cubeImage[ i ].data );
}
} else {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glInternalFormat, cubeImage[ i ].width, cubeImage[ i ].height, 0, glFormat, glType, cubeImage[ i ].data );
}
for ( let j = 0; j < mipmaps.length; j ++ ) {
const mipmap = mipmaps[ j ];
 const mipmapImage = mipmap.image[ i ].image;
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, 0, 0, mipmapImage.width, mipmapImage.height, glFormat, glType, mipmapImage.data );
}
} else {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, glInternalFormat, mipmapImage.width, mipmapImage.height, 0, glFormat, glType, mipmapImage.data );
}
}
} else {
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 0, 0, glFormat, glType, cubeImage[ i ] );
}
} else {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glInternalFormat, glFormat, glType, cubeImage[ i ] );
}
for ( let j = 0; j < mipmaps.length; j ++ ) {
const mipmap = mipmaps[ j ];
if ( useTexStorage ) {
if ( dataReady ) {
state.texSubImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, 0, 0, glFormat, glType, mipmap.image[ i ] );
}
} else {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j + 1, glInternalFormat, glFormat, glType, mipmap.image[ i ] );
}
}
}
}
}
if ( textureNeedsGenerateMipmaps( texture ) ) {
// We assume images for cube map have the same size.
 generateMipmap( _gl.TEXTURE_CUBE_MAP );
}
sourceProperties.__version = source.version;
if ( texture.onUpdate ) texture.onUpdate( texture );
}
textureProperties.__version = texture.version;
}
// Render targets
// Setup storage for target texture and bind it to correct framebuffer
 function setupFrameBufferTexture( framebuffer, renderTarget, texture, attachment, textureTarget, level ) {
const glFormat = utils.convert( texture.format, texture.colorSpace );
 const glType = utils.convert( texture.type );
 const glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace );
 const renderTargetProperties = properties.get( renderTarget );
 const textureProperties = properties.get( texture );
textureProperties.__renderTarget = renderTarget;
if ( ! renderTargetProperties.__hasExternalTextures ) {
const width = Math.max( 1, renderTarget.width >> level );
 const height = Math.max( 1, renderTarget.height >> level );
if ( textureTarget === _gl.TEXTURE_3D || textureTarget === _gl.TEXTURE_2D_ARRAY ) {
state.texImage3D( textureTarget, level, glInternalFormat, width, height, renderTarget.depth, 0, glFormat, glType, null );
} else {
state.texImage2D( textureTarget, level, glInternalFormat, width, height, 0, glFormat, glType, null );
}
}
state.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );
if ( useMultisampledRTT( renderTarget ) ) {
multisampledRTTExt.framebufferTexture2DMultisampleEXT( _gl.FRAMEBUFFER, attachment, textureTarget, textureProperties.__webglTexture, 0, getRenderTargetSamples( renderTarget ) );
} else if ( textureTarget === _gl.TEXTURE_2D || ( textureTarget >= _gl.TEXTURE_CUBE_MAP_POSITIVE_X && textureTarget <= _gl.TEXTURE_CUBE_MAP_NEGATIVE_Z ) ) { // see #24753
_gl.framebufferTexture2D( _gl.FRAMEBUFFER, attachment, textureTarget, textureProperties.__webglTexture, level );
}
state.bindFramebuffer( _gl.FRAMEBUFFER, null );
}
// Setup storage for internal depth/stencil buffers and bind to correct framebuffer
 function setupRenderBufferStorage( renderbuffer, renderTarget, isMultisample ) {
_gl.bindRenderbuffer( _gl.RENDERBUFFER, renderbuffer );
if ( renderTarget.depthBuffer ) {
// retrieve the depth attachment types
 const depthTexture = renderTarget.depthTexture;
 const depthType = depthTexture && depthTexture.isDepthTexture ? depthTexture.type : null;
 const glInternalFormat = getInternalDepthFormat( renderTarget.stencilBuffer, depthType );
 const glAttachmentType = renderTarget.stencilBuffer ? _gl.DEPTH_STENCIL_ATTACHMENT : _gl.DEPTH_ATTACHMENT;
// set up the attachment
 const samples = getRenderTargetSamples( renderTarget );
 const isUseMultisampledRTT = useMultisampledRTT( renderTarget );
 if ( isUseMultisampledRTT ) {
multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
} else if ( isMultisample ) {
_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
} else {
_gl.renderbufferStorage( _gl.RENDERBUFFER, glInternalFormat, renderTarget.width, renderTarget.height );
}
_gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, glAttachmentType, _gl.RENDERBUFFER, renderbuffer );
} else {
const textures = renderTarget.textures;
for ( let i = 0; i < textures.length; i ++ ) {
const texture = textures[ i ];
const glFormat = utils.convert( texture.format, texture.colorSpace );
 const glType = utils.convert( texture.type );
 const glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace );
 const samples = getRenderTargetSamples( renderTarget );
if ( isMultisample && useMultisampledRTT( renderTarget ) === false ) {
_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
} else if ( useMultisampledRTT( renderTarget ) ) {
multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
} else {
_gl.renderbufferStorage( _gl.RENDERBUFFER, glInternalFormat, renderTarget.width, renderTarget.height );
}
}
}
_gl.bindRenderbuffer( _gl.RENDERBUFFER, null );
}
// Setup resources for a Depth Texture for a FBO (needs an extension)
 function setupDepthTexture( framebuffer, renderTarget ) {
const isCube = ( renderTarget && renderTarget.isWebGLCubeRenderTarget );
 if ( isCube ) throw new Error( 'Depth Texture with cube render targets is not supported' );
state.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );
if ( ! ( renderTarget.depthTexture && renderTarget.depthTexture.isDepthTexture ) ) {
throw new Error( 'renderTarget.depthTexture must be an instance of THREE.DepthTexture' );
}
const textureProperties = properties.get( renderTarget.depthTexture );
 textureProperties.__renderTarget = renderTarget;
// upload an empty depth texture with framebuffer size
 if ( ! textureProperties.__webglTexture ||
 renderTarget.depthTexture.image.width !== renderTarget.width ||
 renderTarget.depthTexture.image.height !== renderTarget.height ) {
renderTarget.depthTexture.image.width = renderTarget.width;
 renderTarget.depthTexture.image.height = renderTarget.height;
 renderTarget.depthTexture.needsUpdate = true;
}
setTexture2D( renderTarget.depthTexture, 0 );
const webglDepthTexture = textureProperties.__webglTexture;
 const samples = getRenderTargetSamples( renderTarget );
if ( renderTarget.depthTexture.format === DepthFormat ) {
if ( useMultisampledRTT( renderTarget ) ) {
multisampledRTTExt.framebufferTexture2DMultisampleEXT( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0, samples );
} else {
_gl.framebufferTexture2D( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0 );
}
} else if ( renderTarget.depthTexture.format === DepthStencilFormat ) {
if ( useMultisampledRTT( renderTarget ) ) {
multisampledRTTExt.framebufferTexture2DMultisampleEXT( _gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0, samples );
} else {
_gl.framebufferTexture2D( _gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0 );
}
} else {
throw new Error( 'Unknown depthTexture format' );
}
}
// Setup GL resources for a non-texture depth buffer
 function setupDepthRenderbuffer( renderTarget ) {
const renderTargetProperties = properties.get( renderTarget );
 const isCube = ( renderTarget.isWebGLCubeRenderTarget === true );
// if the bound depth texture has changed
 if ( renderTargetProperties.__boundDepthTexture !== renderTarget.depthTexture ) {
// fire the dispose event to get rid of stored state associated with the previously bound depth buffer
 const depthTexture = renderTarget.depthTexture;
 if ( renderTargetProperties.__depthDisposeCallback ) {
renderTargetProperties.__depthDisposeCallback();
}
// set up dispose listeners to track when the currently attached buffer is implicitly unbound
 if ( depthTexture ) {
const disposeEvent = () => {
delete renderTargetProperties.__boundDepthTexture;
 delete renderTargetProperties.__depthDisposeCallback;
 depthTexture.removeEventListener( 'dispose', disposeEvent );
};
depthTexture.addEventListener( 'dispose', disposeEvent );
 renderTargetProperties.__depthDisposeCallback = disposeEvent;
}
renderTargetProperties.__boundDepthTexture = depthTexture;
}
if ( renderTarget.depthTexture && ! renderTargetProperties.__autoAllocateDepthBuffer ) {
if ( isCube ) throw new Error( 'target.depthTexture not supported in Cube render targets' );
const mipmaps = renderTarget.texture.mipmaps;
if ( mipmaps && mipmaps.length > 0 ) {
setupDepthTexture( renderTargetProperties.__webglFramebuffer[ 0 ], renderTarget );
} else {
setupDepthTexture( renderTargetProperties.__webglFramebuffer, renderTarget );
}
} else {
if ( isCube ) {
renderTargetProperties.__webglDepthbuffer = [];
for ( let i = 0; i < 6; i ++ ) {
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer[ i ] );
if ( renderTargetProperties.__webglDepthbuffer[ i ] === undefined ) {
renderTargetProperties.__webglDepthbuffer[ i ] = _gl.createRenderbuffer();
 setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer[ i ], renderTarget, false );
} else {
// attach buffer if it's been created already
 const glAttachmentType = renderTarget.stencilBuffer ? _gl.DEPTH_STENCIL_ATTACHMENT : _gl.DEPTH_ATTACHMENT;
 const renderbuffer = renderTargetProperties.__webglDepthbuffer[ i ];
 _gl.bindRenderbuffer( _gl.RENDERBUFFER, renderbuffer );
 _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, glAttachmentType, _gl.RENDERBUFFER, renderbuffer );
}
}
} else {
const mipmaps = renderTarget.texture.mipmaps;
if ( mipmaps && mipmaps.length > 0 ) {
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer[ 0 ] );
} else {
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );
}
if ( renderTargetProperties.__webglDepthbuffer === undefined ) {
renderTargetProperties.__webglDepthbuffer = _gl.createRenderbuffer();
 setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer, renderTarget, false );
} else {
// attach buffer if it's been created already
 const glAttachmentType = renderTarget.stencilBuffer ? _gl.DEPTH_STENCIL_ATTACHMENT : _gl.DEPTH_ATTACHMENT;
 const renderbuffer = renderTargetProperties.__webglDepthbuffer;
 _gl.bindRenderbuffer( _gl.RENDERBUFFER, renderbuffer );
 _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, glAttachmentType, _gl.RENDERBUFFER, renderbuffer );
}
}
}
state.bindFramebuffer( _gl.FRAMEBUFFER, null );
}
// rebind framebuffer with external textures
 function rebindTextures( renderTarget, colorTexture, depthTexture ) {
const renderTargetProperties = properties.get( renderTarget );
if ( colorTexture !== undefined ) {
setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, renderTarget.texture, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_2D, 0 );
}
if ( depthTexture !== undefined ) {
setupDepthRenderbuffer( renderTarget );
}
}
// Set up GL resources for the render target
 function setupRenderTarget( renderTarget ) {
const texture = renderTarget.texture;
const renderTargetProperties = properties.get( renderTarget );
 const textureProperties = properties.get( texture );
renderTarget.addEventListener( 'dispose', onRenderTargetDispose );
const textures = renderTarget.textures;
const isCube = ( renderTarget.isWebGLCubeRenderTarget === true );
 const isMultipleRenderTargets = ( textures.length > 1 );
if ( ! isMultipleRenderTargets ) {
if ( textureProperties.__webglTexture === undefined ) {
textureProperties.__webglTexture = _gl.createTexture();
}
textureProperties.__version = texture.version;
 info.memory.textures ++;
}
// Setup framebuffer
if ( isCube ) {
renderTargetProperties.__webglFramebuffer = [];
for ( let i = 0; i < 6; i ++ ) {
if ( texture.mipmaps && texture.mipmaps.length > 0 ) {
renderTargetProperties.__webglFramebuffer[ i ] = [];
for ( let level = 0; level < texture.mipmaps.length; level ++ ) {
renderTargetProperties.__webglFramebuffer[ i ][ level ] = _gl.createFramebuffer();
}
} else {
renderTargetProperties.__webglFramebuffer[ i ] = _gl.createFramebuffer();
}
}
} else {
if ( texture.mipmaps && texture.mipmaps.length > 0 ) {
renderTargetProperties.__webglFramebuffer = [];
for ( let level = 0; level < texture.mipmaps.length; level ++ ) {
renderTargetProperties.__webglFramebuffer[ level ] = _gl.createFramebuffer();
}
} else {
renderTargetProperties.__webglFramebuffer = _gl.createFramebuffer();
}
if ( isMultipleRenderTargets ) {
for ( let i = 0, il = textures.length; i < il; i ++ ) {
const attachmentProperties = properties.get( textures[ i ] );
if ( attachmentProperties.__webglTexture === undefined ) {
attachmentProperties.__webglTexture = _gl.createTexture();
info.memory.textures ++;
}
}
}
if ( ( renderTarget.samples > 0 ) && useMultisampledRTT( renderTarget ) === false ) {
renderTargetProperties.__webglMultisampledFramebuffer = _gl.createFramebuffer();
 renderTargetProperties.__webglColorRenderbuffer = [];
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );
for ( let i = 0; i < textures.length; i ++ ) {
const texture = textures[ i ];
 renderTargetProperties.__webglColorRenderbuffer[ i ] = _gl.createRenderbuffer();
_gl.bindRenderbuffer( _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );
const glFormat = utils.convert( texture.format, texture.colorSpace );
 const glType = utils.convert( texture.type );
 const glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace, renderTarget.isXRRenderTarget === true );
 const samples = getRenderTargetSamples( renderTarget );
 _gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
_gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );
}
_gl.bindRenderbuffer( _gl.RENDERBUFFER, null );
if ( renderTarget.depthBuffer ) {
renderTargetProperties.__webglDepthRenderbuffer = _gl.createRenderbuffer();
 setupRenderBufferStorage( renderTargetProperties.__webglDepthRenderbuffer, renderTarget, true );
}
state.bindFramebuffer( _gl.FRAMEBUFFER, null );
}
}
// Setup color buffer
if ( isCube ) {
state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture );
 setTextureParameters( _gl.TEXTURE_CUBE_MAP, texture );
for ( let i = 0; i < 6; i ++ ) {
if ( texture.mipmaps && texture.mipmaps.length > 0 ) {
for ( let level = 0; level < texture.mipmaps.length; level ++ ) {
setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ i ][ level ], renderTarget, texture, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, level );
}
} else {
setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ i ], renderTarget, texture, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0 );
}
}
if ( textureNeedsGenerateMipmaps( texture ) ) {
generateMipmap( _gl.TEXTURE_CUBE_MAP );
}
state.unbindTexture();
} else if ( isMultipleRenderTargets ) {
for ( let i = 0, il = textures.length; i < il; i ++ ) {
const attachment = textures[ i ];
 const attachmentProperties = properties.get( attachment );
state.bindTexture( _gl.TEXTURE_2D, attachmentProperties.__webglTexture );
 setTextureParameters( _gl.TEXTURE_2D, attachment );
 setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, attachment, _gl.COLOR_ATTACHMENT0 + i, _gl.TEXTURE_2D, 0 );
if ( textureNeedsGenerateMipmaps( attachment ) ) {
generateMipmap( _gl.TEXTURE_2D );
}
}
state.unbindTexture();
} else {
let glTextureType = _gl.TEXTURE_2D;
if ( renderTarget.isWebGL3DRenderTarget || renderTarget.isWebGLArrayRenderTarget ) {
glTextureType = renderTarget.isWebGL3DRenderTarget ? _gl.TEXTURE_3D : _gl.TEXTURE_2D_ARRAY;
}
state.bindTexture( glTextureType, textureProperties.__webglTexture );
 setTextureParameters( glTextureType, texture );
if ( texture.mipmaps && texture.mipmaps.length > 0 ) {
for ( let level = 0; level < texture.mipmaps.length; level ++ ) {
setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ level ], renderTarget, texture, _gl.COLOR_ATTACHMENT0, glTextureType, level );
}
} else {
setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, texture, _gl.COLOR_ATTACHMENT0, glTextureType, 0 );
}
if ( textureNeedsGenerateMipmaps( texture ) ) {
generateMipmap( glTextureType );
}
state.unbindTexture();
}
// Setup depth and stencil buffers
if ( renderTarget.depthBuffer ) {
setupDepthRenderbuffer( renderTarget );
}
}
function updateRenderTargetMipmap( renderTarget ) {
const textures = renderTarget.textures;
for ( let i = 0, il = textures.length; i < il; i ++ ) {
const texture = textures[ i ];
if ( textureNeedsGenerateMipmaps( texture ) ) {
const targetType = getTargetType( renderTarget );
 const webglTexture = properties.get( texture ).__webglTexture;
state.bindTexture( targetType, webglTexture );
 generateMipmap( targetType );
 state.unbindTexture();
}
}
}
const invalidationArrayRead = [];
 const invalidationArrayDraw = [];
function updateMultisampleRenderTarget( renderTarget ) {
if ( renderTarget.samples > 0 ) {
if ( useMultisampledRTT( renderTarget ) === false ) {
const textures = renderTarget.textures;
 const width = renderTarget.width;
 const height = renderTarget.height;
 let mask = _gl.COLOR_BUFFER_BIT;
 const depthStyle = renderTarget.stencilBuffer ? _gl.DEPTH_STENCIL_ATTACHMENT : _gl.DEPTH_ATTACHMENT;
 const renderTargetProperties = properties.get( renderTarget );
 const isMultipleRenderTargets = ( textures.length > 1 );
// If MRT we need to remove FBO attachments
 if ( isMultipleRenderTargets ) {
for ( let i = 0; i < textures.length; i ++ ) {
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );
 _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.RENDERBUFFER, null );
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );
 _gl.framebufferTexture2D( _gl.DRAW_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.TEXTURE_2D, null, 0 );
}
}
state.bindFramebuffer( _gl.READ_FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );
const mipmaps = renderTarget.texture.mipmaps;
if ( mipmaps && mipmaps.length > 0 ) {
state.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, renderTargetProperties.__webglFramebuffer[ 0 ] );
} else {
state.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );
}
for ( let i = 0; i < textures.length; i ++ ) {
if ( renderTarget.resolveDepthBuffer ) {
if ( renderTarget.depthBuffer ) mask |= _gl.DEPTH_BUFFER_BIT;
// resolving stencil is slow with a D3D backend. disable it for all transmission render targets (see #27799)
if ( renderTarget.stencilBuffer && renderTarget.resolveStencilBuffer ) mask |= _gl.STENCIL_BUFFER_BIT;
}
if ( isMultipleRenderTargets ) {
_gl.framebufferRenderbuffer( _gl.READ_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );
const webglTexture = properties.get( textures[ i ] ).__webglTexture;
 _gl.framebufferTexture2D( _gl.DRAW_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_2D, webglTexture, 0 );
}
_gl.blitFramebuffer( 0, 0, width, height, 0, 0, width, height, mask, _gl.NEAREST );
if ( supportsInvalidateFramebuffer === true ) {
invalidationArrayRead.length = 0;
 invalidationArrayDraw.length = 0;
invalidationArrayRead.push( _gl.COLOR_ATTACHMENT0 + i );
if ( renderTarget.depthBuffer && renderTarget.resolveDepthBuffer === false ) {
invalidationArrayRead.push( depthStyle );
 invalidationArrayDraw.push( depthStyle );
_gl.invalidateFramebuffer( _gl.DRAW_FRAMEBUFFER, invalidationArrayDraw );
}
_gl.invalidateFramebuffer( _gl.READ_FRAMEBUFFER, invalidationArrayRead );
}
}
state.bindFramebuffer( _gl.READ_FRAMEBUFFER, null );
 state.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, null );
// If MRT since pre-blit we removed the FBO we need to reconstruct the attachments
 if ( isMultipleRenderTargets ) {
for ( let i = 0; i < textures.length; i ++ ) {
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );
 _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer[ i ] );
const webglTexture = properties.get( textures[ i ] ).__webglTexture;
state.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );
 _gl.framebufferTexture2D( _gl.DRAW_FRAMEBUFFER, _gl.COLOR_ATTACHMENT0 + i, _gl.TEXTURE_2D, webglTexture, 0 );
}
}
state.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );
} else {
if ( renderTarget.depthBuffer && renderTarget.resolveDepthBuffer === false && supportsInvalidateFramebuffer ) {
const depthStyle = renderTarget.stencilBuffer ? _gl.DEPTH_STENCIL_ATTACHMENT : _gl.DEPTH_ATTACHMENT;
_gl.invalidateFramebuffer( _gl.DRAW_FRAMEBUFFER, [ depthStyle ] );
}
}
}
}
function getRenderTargetSamples( renderTarget ) {
return Math.min( capabilities.maxSamples, renderTarget.samples );
}
function useMultisampledRTT( renderTarget ) {
const renderTargetProperties = properties.get( renderTarget );
return renderTarget.samples > 0 && extensions.has( 'WEBGL_multisampled_render_to_texture' ) === true && renderTargetProperties.__useRenderToTexture !== false;
}
function updateVideoTexture( texture ) {
const frame = info.render.frame;
// Check the last frame we updated the VideoTexture
if ( _videoTextures.get( texture ) !== frame ) {
_videoTextures.set( texture, frame );
 texture.update();
}
}
function verifyColorSpace( texture, image ) {
const colorSpace = texture.colorSpace;
 const format = texture.format;
 const type = texture.type;
if ( texture.isCompressedTexture === true || texture.isVideoTexture === true ) return image;
if ( colorSpace !== LinearSRGBColorSpace && colorSpace !== NoColorSpace ) {
// sRGB
if ( ColorManagement.getTransfer( colorSpace ) === SRGBTransfer ) {
// in WebGL 2 uncompressed textures can only be sRGB encoded if they have the RGBA8 format
if ( format !== RGBAFormat || type !== UnsignedByteType ) {
console.warn( 'THREE.WebGLTextures: sRGB encoded textures have to use RGBAFormat and UnsignedByteType.' );
}
} else {
console.error( 'THREE.WebGLTextures: Unsupported texture color space:', colorSpace );
}
}
return image;
}
function getDimensions( image ) {
if ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) {
// if intrinsic data are not available, fallback to width/height
_imageDimensions.width = image.naturalWidth || image.width;
 _imageDimensions.height = image.naturalHeight || image.height;
} else if ( typeof VideoFrame !== 'undefined' && image instanceof VideoFrame ) {
_imageDimensions.width = image.displayWidth;
 _imageDimensions.height = image.displayHeight;
} else {
_imageDimensions.width = image.width;
 _imageDimensions.height = image.height;
}
return _imageDimensions;
}
//
this.allocateTextureUnit = allocateTextureUnit;
 this.resetTextureUnits = resetTextureUnits;
this.setTexture2D = setTexture2D;
 this.setTexture2DArray = setTexture2DArray;
 this.setTexture3D = setTexture3D;
 this.setTextureCube = setTextureCube;
 this.rebindTextures = rebindTextures;
 this.setupRenderTarget = setupRenderTarget;
 this.updateRenderTargetMipmap = updateRenderTargetMipmap;
 this.updateMultisampleRenderTarget = updateMultisampleRenderTarget;
 this.setupDepthRenderbuffer = setupDepthRenderbuffer;
 this.setupFrameBufferTexture = setupFrameBufferTexture;
 this.useMultisampledRTT = useMultisampledRTT;
}
export { WebGLTextures };

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