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web3d / node_modules /three /src /renderers /webgl /WebGLTextures.js
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/**
 * @author mrdoob / http://mrdoob.com/
 */
import { LinearFilter, NearestFilter, RGBFormat, RGBAFormat, DepthFormat, DepthStencilFormat, UnsignedShortType, UnsignedIntType, UnsignedInt248Type, FloatType, HalfFloatType, ClampToEdgeWrapping, NearestMipMapLinearFilter, NearestMipMapNearestFilter } from '../../constants.js';
import { _Math } from '../../math/Math.js';
function WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info ) {
var _videoTextures = {};
 var _canvas;
//
var useOffscreenCanvas = typeof OffscreenCanvas !== 'undefined';
function createCanvas( width, height ) {
// Use OffscreenCanvas when available. Specially needed in web workers
return useOffscreenCanvas ?
 new OffscreenCanvas( width, height ) :
 document.createElementNS( 'http://www.w3.org/1999/xhtml', 'canvas' );
}
function resizeImage( image, needsPowerOfTwo, needsNewCanvas, maxSize ) {
var scale = 1;
// handle case if texture exceeds max size
if ( image.width > maxSize || image.height > maxSize ) {
scale = maxSize / Math.max( image.width, image.height );
}
// only perform resize if necessary
if ( scale < 1 || needsPowerOfTwo === true ) {
// 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 ) ) {
var floor = needsPowerOfTwo ? _Math.floorPowerOfTwo : Math.floor;
var width = floor( scale * image.width );
 var height = floor( scale * image.height );
if ( _canvas === undefined ) _canvas = createCanvas( width, height );
// cube textures can't reuse the same canvas
var canvas = needsNewCanvas ? createCanvas( width, height ) : _canvas;
canvas.width = width;
 canvas.height = height;
var context = canvas.getContext( '2d' );
 context.drawImage( image, 0, 0, width, height );
console.warn( 'THREE.WebGLRenderer: Texture has been resized from (' + image.width + 'x' + image.height + ') to (' + width + 'x' + height + ').' );
return canvas;
} else {
if ( 'data' in image ) {
console.warn( 'THREE.WebGLRenderer: Image in DataTexture is too big (' + image.width + 'x' + image.height + ').' );
}
return image;
}
}
return image;
}
function isPowerOfTwo( image ) {
return _Math.isPowerOfTwo( image.width ) && _Math.isPowerOfTwo( image.height );
}
function textureNeedsPowerOfTwo( texture ) {
if ( capabilities.isWebGL2 ) return false;
return ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) ||
 ( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter );
}
function textureNeedsGenerateMipmaps( texture, supportsMips ) {
return texture.generateMipmaps && supportsMips &&
 texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter;
}
function generateMipmap( target, texture, width, height ) {
_gl.generateMipmap( target );
var textureProperties = properties.get( texture );
// Note: Math.log( x ) * Math.LOG2E used instead of Math.log2( x ) which is not supported by IE11
 textureProperties.__maxMipLevel = Math.log( Math.max( width, height ) ) * Math.LOG2E;
}
function getInternalFormat( glFormat, glType ) {
if ( ! capabilities.isWebGL2 ) return glFormat;
var 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.RGB ) {
if ( glType === _gl.FLOAT ) internalFormat = _gl.RGB32F;
 if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.RGB16F;
 if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.RGB8;
}
if ( glFormat === _gl.RGBA ) {
if ( glType === _gl.FLOAT ) internalFormat = _gl.RGBA32F;
 if ( glType === _gl.HALF_FLOAT ) internalFormat = _gl.RGBA16F;
 if ( glType === _gl.UNSIGNED_BYTE ) internalFormat = _gl.RGBA8;
}
if ( internalFormat === _gl.R16F || internalFormat === _gl.R32F ||
 internalFormat === _gl.RGBA16F || internalFormat === _gl.RGBA32F ) {
extensions.get( 'EXT_color_buffer_float' );
} else if ( internalFormat === _gl.RGB16F || internalFormat === _gl.RGB32F ) {
console.warn( 'THREE.WebGLRenderer: Floating point textures with RGB format not supported. Please use RGBA instead.' );
}
return internalFormat;
}
// Fallback filters for non-power-of-2 textures
function filterFallback( f ) {
if ( f === NearestFilter || f === NearestMipMapNearestFilter || f === NearestMipMapLinearFilter ) {
return _gl.NEAREST;
}
return _gl.LINEAR;
}
//
function onTextureDispose( event ) {
var texture = event.target;
texture.removeEventListener( 'dispose', onTextureDispose );
deallocateTexture( texture );
if ( texture.isVideoTexture ) {
delete _videoTextures[ texture.id ];
}
info.memory.textures --;
}
function onRenderTargetDispose( event ) {
var renderTarget = event.target;
renderTarget.removeEventListener( 'dispose', onRenderTargetDispose );
deallocateRenderTarget( renderTarget );
info.memory.textures --;
}
//
function deallocateTexture( texture ) {
var textureProperties = properties.get( texture );
if ( textureProperties.__webglInit === undefined ) return;
_gl.deleteTexture( textureProperties.__webglTexture );
properties.remove( texture );
}
function deallocateRenderTarget( renderTarget ) {
var renderTargetProperties = properties.get( renderTarget );
 var textureProperties = properties.get( renderTarget.texture );
if ( ! renderTarget ) return;
if ( textureProperties.__webglTexture !== undefined ) {
_gl.deleteTexture( textureProperties.__webglTexture );
}
if ( renderTarget.depthTexture ) {
renderTarget.depthTexture.dispose();
}
if ( renderTarget.isWebGLRenderTargetCube ) {
for ( var i = 0; i < 6; i ++ ) {
_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ] );
 if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer[ i ] );
}
} else {
_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer );
 if ( renderTargetProperties.__webglDepthbuffer ) _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer );
}
properties.remove( renderTarget.texture );
 properties.remove( renderTarget );
}
//
var textureUnits = 0;
function resetTextureUnits() {
textureUnits = 0;
}
function allocateTextureUnit() {
var 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 setTexture2D( texture, slot ) {
var textureProperties = properties.get( texture );
if ( texture.isVideoTexture ) updateVideoTexture( texture );
if ( texture.version > 0 && textureProperties.__version !== texture.version ) {
var image = texture.image;
if ( image === undefined ) {
console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is undefined' );
} else if ( image.complete === false ) {
console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is incomplete' );
} else {
uploadTexture( textureProperties, texture, slot );
 return;
}
}
state.activeTexture( _gl.TEXTURE0 + slot );
 state.bindTexture( _gl.TEXTURE_2D, textureProperties.__webglTexture );
}
function setTexture2DArray( texture, slot ) {
var textureProperties = properties.get( texture );
if ( texture.version > 0 && textureProperties.__version !== texture.version ) {
uploadTexture( textureProperties, texture, slot );
 return;
}
state.activeTexture( _gl.TEXTURE0 + slot );
 state.bindTexture( _gl.TEXTURE_2D_ARRAY, textureProperties.__webglTexture );
}
function setTexture3D( texture, slot ) {
var textureProperties = properties.get( texture );
if ( texture.version > 0 && textureProperties.__version !== texture.version ) {
uploadTexture( textureProperties, texture, slot );
 return;
}
state.activeTexture( _gl.TEXTURE0 + slot );
 state.bindTexture( _gl.TEXTURE_3D, textureProperties.__webglTexture );
}
function setTextureCube( texture, slot ) {
var textureProperties = properties.get( texture );
if ( texture.image.length === 6 ) {
if ( texture.version > 0 && textureProperties.__version !== texture.version ) {
initTexture( textureProperties, texture );
state.activeTexture( _gl.TEXTURE0 + slot );
 state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture );
_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );
var isCompressed = ( texture && texture.isCompressedTexture );
 var isDataTexture = ( texture.image[ 0 ] && texture.image[ 0 ].isDataTexture );
var cubeImage = [];
for ( var i = 0; i < 6; i ++ ) {
if ( ! isCompressed && ! isDataTexture ) {
cubeImage[ i ] = resizeImage( texture.image[ i ], false, true, capabilities.maxCubemapSize );
} else {
cubeImage[ i ] = isDataTexture ? texture.image[ i ].image : texture.image[ i ];
}
}
var image = cubeImage[ 0 ],
 supportsMips = isPowerOfTwo( image ) || capabilities.isWebGL2,
 glFormat = utils.convert( texture.format ),
 glType = utils.convert( texture.type ),
 glInternalFormat = getInternalFormat( glFormat, glType );
setTextureParameters( _gl.TEXTURE_CUBE_MAP, texture, supportsMips );
for ( var i = 0; i < 6; i ++ ) {
if ( ! isCompressed ) {
if ( isDataTexture ) {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glInternalFormat, cubeImage[ i ].width, cubeImage[ i ].height, 0, glFormat, glType, cubeImage[ i ].data );
} else {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glInternalFormat, glFormat, glType, cubeImage[ i ] );
}
} else {
var mipmap, mipmaps = cubeImage[ i ].mipmaps;
for ( var j = 0, jl = mipmaps.length; j < jl; j ++ ) {
mipmap = mipmaps[ j ];
if ( texture.format !== RGBAFormat && texture.format !== RGBFormat ) {
if ( state.getCompressedTextureFormats().indexOf( glFormat ) > - 1 ) {
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 {
state.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );
}
}
}
}
if ( ! isCompressed ) {
textureProperties.__maxMipLevel = 0;
} else {
textureProperties.__maxMipLevel = mipmaps.length - 1;
}
if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {
// We assume images for cube map have the same size.
 generateMipmap( _gl.TEXTURE_CUBE_MAP, texture, image.width, image.height );
}
textureProperties.__version = texture.version;
if ( texture.onUpdate ) texture.onUpdate( texture );
} else {
state.activeTexture( _gl.TEXTURE0 + slot );
 state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture );
}
}
}
function setTextureCubeDynamic( texture, slot ) {
state.activeTexture( _gl.TEXTURE0 + slot );
 state.bindTexture( _gl.TEXTURE_CUBE_MAP, properties.get( texture ).__webglTexture );
}
function setTextureParameters( textureType, texture, supportsMips ) {
var extension;
if ( supportsMips ) {
_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, utils.convert( texture.wrapS ) );
 _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, utils.convert( texture.wrapT ) );
if ( textureType === _gl.TEXTURE_3D || textureType === _gl.TEXTURE_2D_ARRAY ) {
_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_R, utils.convert( texture.wrapR ) );
}
_gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, utils.convert( texture.magFilter ) );
 _gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, utils.convert( texture.minFilter ) );
} else {
_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, _gl.CLAMP_TO_EDGE );
 _gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, _gl.CLAMP_TO_EDGE );
if ( textureType === _gl.TEXTURE_3D || textureType === _gl.TEXTURE_2D_ARRAY ) {
_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_R, _gl.CLAMP_TO_EDGE );
}
if ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) {
console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.wrapS and Texture.wrapT should be set to THREE.ClampToEdgeWrapping.' );
}
_gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, filterFallback( texture.magFilter ) );
 _gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, filterFallback( texture.minFilter ) );
if ( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter ) {
console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.minFilter should be set to THREE.NearestFilter or THREE.LinearFilter.' );
}
}
extension = extensions.get( 'EXT_texture_filter_anisotropic' );
if ( extension ) {
if ( texture.type === FloatType && extensions.get( 'OES_texture_float_linear' ) === null ) return;
 if ( texture.type === HalfFloatType && ( capabilities.isWebGL2 || extensions.get( 'OES_texture_half_float_linear' ) ) === null ) return;
if ( texture.anisotropy > 1 || properties.get( texture ).__currentAnisotropy ) {
_gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, capabilities.getMaxAnisotropy() ) );
 properties.get( texture ).__currentAnisotropy = texture.anisotropy;
}
}
}
function initTexture( textureProperties, texture ) {
if ( textureProperties.__webglInit === undefined ) {
textureProperties.__webglInit = true;
texture.addEventListener( 'dispose', onTextureDispose );
textureProperties.__webglTexture = _gl.createTexture();
info.memory.textures ++;
}
}
function uploadTexture( textureProperties, texture, slot ) {
var textureType = _gl.TEXTURE_2D;
if ( texture.isDataTexture2DArray ) textureType = _gl.TEXTURE_2D_ARRAY;
 if ( texture.isDataTexture3D ) textureType = _gl.TEXTURE_3D;
initTexture( textureProperties, texture );
state.activeTexture( _gl.TEXTURE0 + slot );
 state.bindTexture( textureType, textureProperties.__webglTexture );
_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 );
var needsPowerOfTwo = textureNeedsPowerOfTwo( texture ) && isPowerOfTwo( texture.image ) === false;
 var image = resizeImage( texture.image, needsPowerOfTwo, false, capabilities.maxTextureSize );
var supportsMips = isPowerOfTwo( image ) || capabilities.isWebGL2,
 glFormat = utils.convert( texture.format ),
 glType = utils.convert( texture.type ),
 glInternalFormat = getInternalFormat( glFormat, glType );
setTextureParameters( textureType, texture, supportsMips );
var mipmap, mipmaps = texture.mipmaps;
if ( texture.isDepthTexture ) {
// populate depth texture with dummy data
glInternalFormat = _gl.DEPTH_COMPONENT;
if ( texture.type === FloatType ) {
if ( ! capabilities.isWebGL2 ) throw new Error( 'Float Depth Texture only supported in WebGL2.0' );
 glInternalFormat = _gl.DEPTH_COMPONENT32F;
} else if ( capabilities.isWebGL2 ) {
// WebGL 2.0 requires signed internalformat for glTexImage2D
 glInternalFormat = _gl.DEPTH_COMPONENT16;
}
if ( texture.format === DepthFormat && glInternalFormat === _gl.DEPTH_COMPONENT ) {
// The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
 // DEPTH_COMPONENT and type is not UNSIGNED_SHORT or UNSIGNED_INT
 // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
 if ( texture.type !== UnsignedShortType && texture.type !== UnsignedIntType ) {
console.warn( 'THREE.WebGLRenderer: Use UnsignedShortType or UnsignedIntType for DepthFormat DepthTexture.' );
texture.type = UnsignedShortType;
 glType = utils.convert( texture.type );
}
}
// Depth stencil textures need the DEPTH_STENCIL internal format
 // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
 if ( texture.format === DepthStencilFormat ) {
glInternalFormat = _gl.DEPTH_STENCIL;
// The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
 // DEPTH_STENCIL and type is not UNSIGNED_INT_24_8_WEBGL.
 // (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
 if ( texture.type !== UnsignedInt248Type ) {
console.warn( 'THREE.WebGLRenderer: Use UnsignedInt248Type for DepthStencilFormat DepthTexture.' );
texture.type = UnsignedInt248Type;
 glType = utils.convert( texture.type );
}
}
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 && supportsMips ) {
for ( var i = 0, il = mipmaps.length; i < il; i ++ ) {
mipmap = mipmaps[ i ];
 state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );
}
texture.generateMipmaps = false;
 textureProperties.__maxMipLevel = mipmaps.length - 1;
} else {
state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, image.data );
 textureProperties.__maxMipLevel = 0;
}
} else if ( texture.isCompressedTexture ) {
for ( var i = 0, il = mipmaps.length; i < il; i ++ ) {
mipmap = mipmaps[ i ];
if ( texture.format !== RGBAFormat && texture.format !== RGBFormat ) {
if ( state.getCompressedTextureFormats().indexOf( glFormat ) > - 1 ) {
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 {
state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );
}
}
textureProperties.__maxMipLevel = mipmaps.length - 1;
} else if ( texture.isDataTexture2DArray ) {
state.texImage3D( _gl.TEXTURE_2D_ARRAY, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
 textureProperties.__maxMipLevel = 0;
} else if ( texture.isDataTexture3D ) {
state.texImage3D( _gl.TEXTURE_3D, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
 textureProperties.__maxMipLevel = 0;
} 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 && supportsMips ) {
for ( var i = 0, il = mipmaps.length; i < il; i ++ ) {
mipmap = mipmaps[ i ];
 state.texImage2D( _gl.TEXTURE_2D, i, glInternalFormat, glFormat, glType, mipmap );
}
texture.generateMipmaps = false;
 textureProperties.__maxMipLevel = mipmaps.length - 1;
} else {
state.texImage2D( _gl.TEXTURE_2D, 0, glInternalFormat, glFormat, glType, image );
 textureProperties.__maxMipLevel = 0;
}
}
if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {
generateMipmap( _gl.TEXTURE_2D, texture, image.width, image.height );
}
textureProperties.__version = texture.version;
if ( texture.onUpdate ) texture.onUpdate( texture );
}
// Render targets
// Setup storage for target texture and bind it to correct framebuffer
 function setupFrameBufferTexture( framebuffer, renderTarget, attachment, textureTarget ) {
var glFormat = utils.convert( renderTarget.texture.format );
 var glType = utils.convert( renderTarget.texture.type );
 var glInternalFormat = getInternalFormat( glFormat, glType );
 state.texImage2D( textureTarget, 0, glInternalFormat, renderTarget.width, renderTarget.height, 0, glFormat, glType, null );
 _gl.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );
 _gl.framebufferTexture2D( _gl.FRAMEBUFFER, attachment, textureTarget, properties.get( renderTarget.texture ).__webglTexture, 0 );
 _gl.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 && ! renderTarget.stencilBuffer ) {
if ( isMultisample ) {
var samples = getRenderTargetSamples( renderTarget );
_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, _gl.DEPTH_COMPONENT16, renderTarget.width, renderTarget.height );
} else {
_gl.renderbufferStorage( _gl.RENDERBUFFER, _gl.DEPTH_COMPONENT16, renderTarget.width, renderTarget.height );
}
_gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer );
} else if ( renderTarget.depthBuffer && renderTarget.stencilBuffer ) {
if ( isMultisample ) {
var samples = getRenderTargetSamples( renderTarget );
_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, _gl.DEPTH_STENCIL, renderTarget.width, renderTarget.height );
} else {
_gl.renderbufferStorage( _gl.RENDERBUFFER, _gl.DEPTH_STENCIL, renderTarget.width, renderTarget.height );
}
_gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer );
} else {
var glFormat = utils.convert( renderTarget.texture.format );
 var glType = utils.convert( renderTarget.texture.type );
 var glInternalFormat = getInternalFormat( glFormat, glType );
if ( isMultisample ) {
var samples = getRenderTargetSamples( renderTarget );
_gl.renderbufferStorageMultisample( _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 ) {
var isCube = ( renderTarget && renderTarget.isWebGLRenderTargetCube );
 if ( isCube ) throw new Error( 'Depth Texture with cube render targets is not supported' );
_gl.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );
if ( ! ( renderTarget.depthTexture && renderTarget.depthTexture.isDepthTexture ) ) {
throw new Error( 'renderTarget.depthTexture must be an instance of THREE.DepthTexture' );
}
// upload an empty depth texture with framebuffer size
 if ( ! properties.get( renderTarget.depthTexture ).__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 );
var webglDepthTexture = properties.get( renderTarget.depthTexture ).__webglTexture;
if ( renderTarget.depthTexture.format === DepthFormat ) {
_gl.framebufferTexture2D( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0 );
} else if ( renderTarget.depthTexture.format === DepthStencilFormat ) {
_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 ) {
var renderTargetProperties = properties.get( renderTarget );
var isCube = ( renderTarget.isWebGLRenderTargetCube === true );
if ( renderTarget.depthTexture ) {
if ( isCube ) throw new Error( 'target.depthTexture not supported in Cube render targets' );
setupDepthTexture( renderTargetProperties.__webglFramebuffer, renderTarget );
} else {
if ( isCube ) {
renderTargetProperties.__webglDepthbuffer = [];
for ( var i = 0; i < 6; i ++ ) {
_gl.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer[ i ] );
 renderTargetProperties.__webglDepthbuffer[ i ] = _gl.createRenderbuffer();
 setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer[ i ], renderTarget );
}
} else {
_gl.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );
 renderTargetProperties.__webglDepthbuffer = _gl.createRenderbuffer();
 setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer, renderTarget );
}
}
_gl.bindFramebuffer( _gl.FRAMEBUFFER, null );
}
// Set up GL resources for the render target
 function setupRenderTarget( renderTarget ) {
var renderTargetProperties = properties.get( renderTarget );
 var textureProperties = properties.get( renderTarget.texture );
renderTarget.addEventListener( 'dispose', onRenderTargetDispose );
textureProperties.__webglTexture = _gl.createTexture();
info.memory.textures ++;
var isCube = ( renderTarget.isWebGLRenderTargetCube === true );
 var isMultisample = ( renderTarget.isWebGLMultisampleRenderTarget === true );
 var supportsMips = isPowerOfTwo( renderTarget ) || capabilities.isWebGL2;
// Setup framebuffer
if ( isCube ) {
renderTargetProperties.__webglFramebuffer = [];
for ( var i = 0; i < 6; i ++ ) {
renderTargetProperties.__webglFramebuffer[ i ] = _gl.createFramebuffer();
}
} else {
renderTargetProperties.__webglFramebuffer = _gl.createFramebuffer();
if ( isMultisample ) {
if ( capabilities.isWebGL2 ) {
renderTargetProperties.__webglMultisampledFramebuffer = _gl.createFramebuffer();
 renderTargetProperties.__webglColorRenderbuffer = _gl.createRenderbuffer();
_gl.bindRenderbuffer( _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer );
 var glFormat = utils.convert( renderTarget.texture.format );
 var glType = utils.convert( renderTarget.texture.type );
 var glInternalFormat = getInternalFormat( glFormat, glType );
 var samples = getRenderTargetSamples( renderTarget );
 _gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
_gl.bindFramebuffer( _gl.FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );
 _gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, _gl.RENDERBUFFER, renderTargetProperties.__webglColorRenderbuffer );
 _gl.bindRenderbuffer( _gl.RENDERBUFFER, null );
if ( renderTarget.depthBuffer ) {
renderTargetProperties.__webglDepthRenderbuffer = _gl.createRenderbuffer();
 setupRenderBufferStorage( renderTargetProperties.__webglDepthRenderbuffer, renderTarget, true );
}
_gl.bindFramebuffer( _gl.FRAMEBUFFER, null );
} else {
console.warn( 'THREE.WebGLRenderer: WebGLMultisampleRenderTarget can only be used with WebGL2.' );
}
}
}
// Setup color buffer
if ( isCube ) {
state.bindTexture( _gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture );
 setTextureParameters( _gl.TEXTURE_CUBE_MAP, renderTarget.texture, supportsMips );
for ( var i = 0; i < 6; i ++ ) {
setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ i ], renderTarget, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i );
}
if ( textureNeedsGenerateMipmaps( renderTarget.texture, supportsMips ) ) {
generateMipmap( _gl.TEXTURE_CUBE_MAP, renderTarget.texture, renderTarget.width, renderTarget.height );
}
state.bindTexture( _gl.TEXTURE_CUBE_MAP, null );
} else {
state.bindTexture( _gl.TEXTURE_2D, textureProperties.__webglTexture );
 setTextureParameters( _gl.TEXTURE_2D, renderTarget.texture, supportsMips );
 setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_2D );
if ( textureNeedsGenerateMipmaps( renderTarget.texture, supportsMips ) ) {
generateMipmap( _gl.TEXTURE_2D, renderTarget.texture, renderTarget.width, renderTarget.height );
}
state.bindTexture( _gl.TEXTURE_2D, null );
}
// Setup depth and stencil buffers
if ( renderTarget.depthBuffer ) {
setupDepthRenderbuffer( renderTarget );
}
}
function updateRenderTargetMipmap( renderTarget ) {
var texture = renderTarget.texture;
 var supportsMips = isPowerOfTwo( renderTarget ) || capabilities.isWebGL2;
if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {
var target = renderTarget.isWebGLRenderTargetCube ? _gl.TEXTURE_CUBE_MAP : _gl.TEXTURE_2D;
 var webglTexture = properties.get( texture ).__webglTexture;
state.bindTexture( target, webglTexture );
 generateMipmap( target, texture, renderTarget.width, renderTarget.height );
 state.bindTexture( target, null );
}
}
function updateMultisampleRenderTarget( renderTarget ) {
if ( renderTarget.isWebGLMultisampleRenderTarget ) {
if ( capabilities.isWebGL2 ) {
var renderTargetProperties = properties.get( renderTarget );
_gl.bindFramebuffer( _gl.READ_FRAMEBUFFER, renderTargetProperties.__webglMultisampledFramebuffer );
 _gl.bindFramebuffer( _gl.DRAW_FRAMEBUFFER, renderTargetProperties.__webglFramebuffer );
var width = renderTarget.width;
 var height = renderTarget.height;
 var mask = _gl.COLOR_BUFFER_BIT;
if ( renderTarget.depthBuffer ) mask |= _gl.DEPTH_BUFFER_BIT;
 if ( renderTarget.stencilBuffer ) mask |= _gl.STENCIL_BUFFER_BIT;
_gl.blitFramebuffer( 0, 0, width, height, 0, 0, width, height, mask, _gl.NEAREST );
} else {
console.warn( 'THREE.WebGLRenderer: WebGLMultisampleRenderTarget can only be used with WebGL2.' );
}
}
}
function getRenderTargetSamples( renderTarget ) {
return ( capabilities.isWebGL2 && renderTarget.isWebGLMultisampleRenderTarget ) ?
 Math.min( capabilities.maxSamples, renderTarget.samples ) : 0;
}
function updateVideoTexture( texture ) {
var id = texture.id;
 var frame = info.render.frame;
// Check the last frame we updated the VideoTexture
if ( _videoTextures[ id ] !== frame ) {
_videoTextures[ id ] = frame;
 texture.update();
}
}
// backwards compatibility
var warnedTexture2D = false;
 var warnedTextureCube = false;
function safeSetTexture2D( texture, slot ) {
if ( texture && texture.isWebGLRenderTarget ) {
if ( warnedTexture2D === false ) {
console.warn( "THREE.WebGLTextures.safeSetTexture2D: don't use render targets as textures. Use their .texture property instead." );
 warnedTexture2D = true;
}
texture = texture.texture;
}
setTexture2D( texture, slot );
}
function safeSetTextureCube( texture, slot ) {
if ( texture && texture.isWebGLRenderTargetCube ) {
if ( warnedTextureCube === false ) {
console.warn( "THREE.WebGLTextures.safeSetTextureCube: don't use cube render targets as textures. Use their .texture property instead." );
 warnedTextureCube = true;
}
texture = texture.texture;
}
// currently relying on the fact that WebGLRenderTargetCube.texture is a Texture and NOT a CubeTexture
 // TODO: unify these code paths
 if ( ( texture && texture.isCubeTexture ) ||
 ( Array.isArray( texture.image ) && texture.image.length === 6 ) ) {
// CompressedTexture can have Array in image :/
// this function alone should take care of cube textures
 setTextureCube( texture, slot );
} else {
// assumed: texture property of THREE.WebGLRenderTargetCube
 setTextureCubeDynamic( texture, slot );
}
}
//
this.allocateTextureUnit = allocateTextureUnit;
 this.resetTextureUnits = resetTextureUnits;
this.setTexture2D = setTexture2D;
 this.setTexture2DArray = setTexture2DArray;
 this.setTexture3D = setTexture3D;
 this.setTextureCube = setTextureCube;
 this.setTextureCubeDynamic = setTextureCubeDynamic;
 this.setupRenderTarget = setupRenderTarget;
 this.updateRenderTargetMipmap = updateRenderTargetMipmap;
 this.updateMultisampleRenderTarget = updateMultisampleRenderTarget;
this.safeSetTexture2D = safeSetTexture2D;
 this.safeSetTextureCube = safeSetTextureCube;
}
export { WebGLTextures };