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WebGLState.js
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import { NotEqualDepth, GreaterDepth, GreaterEqualDepth, EqualDepth, LessEqualDepth, LessDepth, AlwaysDepth, NeverDepth, CullFaceFront, CullFaceBack, CullFaceNone, DoubleSide, BackSide, CustomBlending, MultiplyBlending, SubtractiveBlending, AdditiveBlending, NoBlending, NormalBlending, AddEquation, SubtractEquation, ReverseSubtractEquation, MinEquation, MaxEquation, ZeroFactor, OneFactor, SrcColorFactor, SrcAlphaFactor, SrcAlphaSaturateFactor, DstColorFactor, DstAlphaFactor, OneMinusSrcColorFactor, OneMinusSrcAlphaFactor, OneMinusDstColorFactor, OneMinusDstAlphaFactor, ConstantColorFactor, OneMinusConstantColorFactor, ConstantAlphaFactor, OneMinusConstantAlphaFactor } from '../../constants.js';
import { Color } from '../../math/Color.js';
import { Vector4 } from '../../math/Vector4.js';
const reversedFuncs = {
[ NeverDepth ]: AlwaysDepth,
[ LessDepth ]: GreaterDepth,
[ EqualDepth ]: NotEqualDepth,
[ LessEqualDepth ]: GreaterEqualDepth,
[ AlwaysDepth ]: NeverDepth,
[ GreaterDepth ]: LessDepth,
[ NotEqualDepth ]: EqualDepth,
[ GreaterEqualDepth ]: LessEqualDepth,
};
function WebGLState( gl, extensions ) {
function ColorBuffer() {
let locked = false;
const color = new Vector4();
let currentColorMask = null;
const currentColorClear = new Vector4( 0, 0, 0, 0 );
return {
setMask: function ( colorMask ) {
if ( currentColorMask !== colorMask && ! locked ) {
gl.colorMask( colorMask, colorMask, colorMask, colorMask );
currentColorMask = colorMask;
}
},
setLocked: function ( lock ) {
locked = lock;
},
setClear: function ( r, g, b, a, premultipliedAlpha ) {
if ( premultipliedAlpha === true ) {
r *= a; g *= a; b *= a;
}
color.set( r, g, b, a );
if ( currentColorClear.equals( color ) === false ) {
gl.clearColor( r, g, b, a );
currentColorClear.copy( color );
}
},
reset: function () {
locked = false;
currentColorMask = null;
currentColorClear.set( - 1, 0, 0, 0 ); // set to invalid state
}
};
}
function DepthBuffer() {
let locked = false;
let reversed = false;
let currentDepthMask = null;
let currentDepthFunc = null;
let currentDepthClear = null;
return {
setReversed: function ( value ) {
if ( reversed !== value ) {
const ext = extensions.get( 'EXT_clip_control' );
if ( reversed ) {
ext.clipControlEXT( ext.LOWER_LEFT_EXT, ext.ZERO_TO_ONE_EXT );
} else {
ext.clipControlEXT( ext.LOWER_LEFT_EXT, ext.NEGATIVE_ONE_TO_ONE_EXT );
}
const oldDepth = currentDepthClear;
currentDepthClear = null;
this.setClear( oldDepth );
}
reversed = value;
},
getReversed: function () {
return reversed;
},
setTest: function ( depthTest ) {
if ( depthTest ) {
enable( gl.DEPTH_TEST );
} else {
disable( gl.DEPTH_TEST );
}
},
setMask: function ( depthMask ) {
if ( currentDepthMask !== depthMask && ! locked ) {
gl.depthMask( depthMask );
currentDepthMask = depthMask;
}
},
setFunc: function ( depthFunc ) {
if ( reversed ) depthFunc = reversedFuncs[ depthFunc ];
if ( currentDepthFunc !== depthFunc ) {
switch ( depthFunc ) {
case NeverDepth:
gl.depthFunc( gl.NEVER );
break;
case AlwaysDepth:
gl.depthFunc( gl.ALWAYS );
break;
case LessDepth:
gl.depthFunc( gl.LESS );
break;
case LessEqualDepth:
gl.depthFunc( gl.LEQUAL );
break;
case EqualDepth:
gl.depthFunc( gl.EQUAL );
break;
case GreaterEqualDepth:
gl.depthFunc( gl.GEQUAL );
break;
case GreaterDepth:
gl.depthFunc( gl.GREATER );
break;
case NotEqualDepth:
gl.depthFunc( gl.NOTEQUAL );
break;
default:
gl.depthFunc( gl.LEQUAL );
}
currentDepthFunc = depthFunc;
}
},
setLocked: function ( lock ) {
locked = lock;
},
setClear: function ( depth ) {
if ( currentDepthClear !== depth ) {
if ( reversed ) {
depth = 1 - depth;
}
gl.clearDepth( depth );
currentDepthClear = depth;
}
},
reset: function () {
locked = false;
currentDepthMask = null;
currentDepthFunc = null;
currentDepthClear = null;
reversed = false;
}
};
}
function StencilBuffer() {
let locked = false;
let currentStencilMask = null;
let currentStencilFunc = null;
let currentStencilRef = null;
let currentStencilFuncMask = null;
let currentStencilFail = null;
let currentStencilZFail = null;
let currentStencilZPass = null;
let currentStencilClear = null;
return {
setTest: function ( stencilTest ) {
if ( ! locked ) {
if ( stencilTest ) {
enable( gl.STENCIL_TEST );
} else {
disable( gl.STENCIL_TEST );
}
}
},
setMask: function ( stencilMask ) {
if ( currentStencilMask !== stencilMask && ! locked ) {
gl.stencilMask( stencilMask );
currentStencilMask = stencilMask;
}
},
setFunc: function ( stencilFunc, stencilRef, stencilMask ) {
if ( currentStencilFunc !== stencilFunc ||
currentStencilRef !== stencilRef ||
currentStencilFuncMask !== stencilMask ) {
gl.stencilFunc( stencilFunc, stencilRef, stencilMask );
currentStencilFunc = stencilFunc;
currentStencilRef = stencilRef;
currentStencilFuncMask = stencilMask;
}
},
setOp: function ( stencilFail, stencilZFail, stencilZPass ) {
if ( currentStencilFail !== stencilFail ||
currentStencilZFail !== stencilZFail ||
currentStencilZPass !== stencilZPass ) {
gl.stencilOp( stencilFail, stencilZFail, stencilZPass );
currentStencilFail = stencilFail;
currentStencilZFail = stencilZFail;
currentStencilZPass = stencilZPass;
}
},
setLocked: function ( lock ) {
locked = lock;
},
setClear: function ( stencil ) {
if ( currentStencilClear !== stencil ) {
gl.clearStencil( stencil );
currentStencilClear = stencil;
}
},
reset: function () {
locked = false;
currentStencilMask = null;
currentStencilFunc = null;
currentStencilRef = null;
currentStencilFuncMask = null;
currentStencilFail = null;
currentStencilZFail = null;
currentStencilZPass = null;
currentStencilClear = null;
}
};
}
//
const colorBuffer = new ColorBuffer();
const depthBuffer = new DepthBuffer();
const stencilBuffer = new StencilBuffer();
const uboBindings = new WeakMap();
const uboProgramMap = new WeakMap();
let enabledCapabilities = {};
let currentBoundFramebuffers = {};
let currentDrawbuffers = new WeakMap();
let defaultDrawbuffers = [];
let currentProgram = null;
let currentBlendingEnabled = false;
let currentBlending = null;
let currentBlendEquation = null;
let currentBlendSrc = null;
let currentBlendDst = null;
let currentBlendEquationAlpha = null;
let currentBlendSrcAlpha = null;
let currentBlendDstAlpha = null;
let currentBlendColor = new Color( 0, 0, 0 );
let currentBlendAlpha = 0;
let currentPremultipledAlpha = false;
let currentFlipSided = null;
let currentCullFace = null;
let currentLineWidth = null;
let currentPolygonOffsetFactor = null;
let currentPolygonOffsetUnits = null;
const maxTextures = gl.getParameter( gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS );
let lineWidthAvailable = false;
let version = 0;
const glVersion = gl.getParameter( gl.VERSION );
if ( glVersion.indexOf( 'WebGL' ) !== - 1 ) {
version = parseFloat( /^WebGL (\d)/.exec( glVersion )[ 1 ] );
lineWidthAvailable = ( version >= 1.0 );
} else if ( glVersion.indexOf( 'OpenGL ES' ) !== - 1 ) {
version = parseFloat( /^OpenGL ES (\d)/.exec( glVersion )[ 1 ] );
lineWidthAvailable = ( version >= 2.0 );
}
let currentTextureSlot = null;
let currentBoundTextures = {};
const scissorParam = gl.getParameter( gl.SCISSOR_BOX );
const viewportParam = gl.getParameter( gl.VIEWPORT );
const currentScissor = new Vector4().fromArray( scissorParam );
const currentViewport = new Vector4().fromArray( viewportParam );
function createTexture( type, target, count, dimensions ) {
const data = new Uint8Array( 4 ); // 4 is required to match default unpack alignment of 4.
const texture = gl.createTexture();
gl.bindTexture( type, texture );
gl.texParameteri( type, gl.TEXTURE_MIN_FILTER, gl.NEAREST );
gl.texParameteri( type, gl.TEXTURE_MAG_FILTER, gl.NEAREST );
for ( let i = 0; i < count; i ++ ) {
if ( type === gl.TEXTURE_3D || type === gl.TEXTURE_2D_ARRAY ) {
gl.texImage3D( target, 0, gl.RGBA, 1, 1, dimensions, 0, gl.RGBA, gl.UNSIGNED_BYTE, data );
} else {
gl.texImage2D( target + i, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, data );
}
}
return texture;
}
const emptyTextures = {};
emptyTextures[ gl.TEXTURE_2D ] = createTexture( gl.TEXTURE_2D, gl.TEXTURE_2D, 1 );
emptyTextures[ gl.TEXTURE_CUBE_MAP ] = createTexture( gl.TEXTURE_CUBE_MAP, gl.TEXTURE_CUBE_MAP_POSITIVE_X, 6 );
emptyTextures[ gl.TEXTURE_2D_ARRAY ] = createTexture( gl.TEXTURE_2D_ARRAY, gl.TEXTURE_2D_ARRAY, 1, 1 );
emptyTextures[ gl.TEXTURE_3D ] = createTexture( gl.TEXTURE_3D, gl.TEXTURE_3D, 1, 1 );
// init
colorBuffer.setClear( 0, 0, 0, 1 );
depthBuffer.setClear( 1 );
stencilBuffer.setClear( 0 );
enable( gl.DEPTH_TEST );
depthBuffer.setFunc( LessEqualDepth );
setFlipSided( false );
setCullFace( CullFaceBack );
enable( gl.CULL_FACE );
setBlending( NoBlending );
//
function enable( id ) {
if ( enabledCapabilities[ id ] !== true ) {
gl.enable( id );
enabledCapabilities[ id ] = true;
}
}
function disable( id ) {
if ( enabledCapabilities[ id ] !== false ) {
gl.disable( id );
enabledCapabilities[ id ] = false;
}
}
function bindFramebuffer( target, framebuffer ) {
if ( currentBoundFramebuffers[ target ] !== framebuffer ) {
gl.bindFramebuffer( target, framebuffer );
currentBoundFramebuffers[ target ] = framebuffer;
// gl.DRAW_FRAMEBUFFER is equivalent to gl.FRAMEBUFFER
if ( target === gl.DRAW_FRAMEBUFFER ) {
currentBoundFramebuffers[ gl.FRAMEBUFFER ] = framebuffer;
}
if ( target === gl.FRAMEBUFFER ) {
currentBoundFramebuffers[ gl.DRAW_FRAMEBUFFER ] = framebuffer;
}
return true;
}
return false;
}
function drawBuffers( renderTarget, framebuffer ) {
let drawBuffers = defaultDrawbuffers;
let needsUpdate = false;
if ( renderTarget ) {
drawBuffers = currentDrawbuffers.get( framebuffer );
if ( drawBuffers === undefined ) {
drawBuffers = [];
currentDrawbuffers.set( framebuffer, drawBuffers );
}
const textures = renderTarget.textures;
if ( drawBuffers.length !== textures.length || drawBuffers[ 0 ] !== gl.COLOR_ATTACHMENT0 ) {
for ( let i = 0, il = textures.length; i < il; i ++ ) {
drawBuffers[ i ] = gl.COLOR_ATTACHMENT0 + i;
}
drawBuffers.length = textures.length;
needsUpdate = true;
}
} else {
if ( drawBuffers[ 0 ] !== gl.BACK ) {
drawBuffers[ 0 ] = gl.BACK;
needsUpdate = true;
}
}
if ( needsUpdate ) {
gl.drawBuffers( drawBuffers );
}
}
function useProgram( program ) {
if ( currentProgram !== program ) {
gl.useProgram( program );
currentProgram = program;
return true;
}
return false;
}
const equationToGL = {
[ AddEquation ]: gl.FUNC_ADD,
[ SubtractEquation ]: gl.FUNC_SUBTRACT,
[ ReverseSubtractEquation ]: gl.FUNC_REVERSE_SUBTRACT
};
equationToGL[ MinEquation ] = gl.MIN;
equationToGL[ MaxEquation ] = gl.MAX;
const factorToGL = {
[ ZeroFactor ]: gl.ZERO,
[ OneFactor ]: gl.ONE,
[ SrcColorFactor ]: gl.SRC_COLOR,
[ SrcAlphaFactor ]: gl.SRC_ALPHA,
[ SrcAlphaSaturateFactor ]: gl.SRC_ALPHA_SATURATE,
[ DstColorFactor ]: gl.DST_COLOR,
[ DstAlphaFactor ]: gl.DST_ALPHA,
[ OneMinusSrcColorFactor ]: gl.ONE_MINUS_SRC_COLOR,
[ OneMinusSrcAlphaFactor ]: gl.ONE_MINUS_SRC_ALPHA,
[ OneMinusDstColorFactor ]: gl.ONE_MINUS_DST_COLOR,
[ OneMinusDstAlphaFactor ]: gl.ONE_MINUS_DST_ALPHA,
[ ConstantColorFactor ]: gl.CONSTANT_COLOR,
[ OneMinusConstantColorFactor ]: gl.ONE_MINUS_CONSTANT_COLOR,
[ ConstantAlphaFactor ]: gl.CONSTANT_ALPHA,
[ OneMinusConstantAlphaFactor ]: gl.ONE_MINUS_CONSTANT_ALPHA
};
function setBlending( blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, blendColor, blendAlpha, premultipliedAlpha ) {
if ( blending === NoBlending ) {
if ( currentBlendingEnabled === true ) {
disable( gl.BLEND );
currentBlendingEnabled = false;
}
return;
}
if ( currentBlendingEnabled === false ) {
enable( gl.BLEND );
currentBlendingEnabled = true;
}
if ( blending !== CustomBlending ) {
if ( blending !== currentBlending || premultipliedAlpha !== currentPremultipledAlpha ) {
if ( currentBlendEquation !== AddEquation || currentBlendEquationAlpha !== AddEquation ) {
gl.blendEquation( gl.FUNC_ADD );
currentBlendEquation = AddEquation;
currentBlendEquationAlpha = AddEquation;
}
if ( premultipliedAlpha ) {
switch ( blending ) {
case NormalBlending:
gl.blendFuncSeparate( gl.ONE, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );
break;
case AdditiveBlending:
gl.blendFunc( gl.ONE, gl.ONE );
break;
case SubtractiveBlending:
gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );
break;
case MultiplyBlending:
gl.blendFuncSeparate( gl.ZERO, gl.SRC_COLOR, gl.ZERO, gl.SRC_ALPHA );
break;
default:
console.error( 'THREE.WebGLState: Invalid blending: ', blending );
break;
}
} else {
switch ( blending ) {
case NormalBlending:
gl.blendFuncSeparate( gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );
break;
case AdditiveBlending:
gl.blendFunc( gl.SRC_ALPHA, gl.ONE );
break;
case SubtractiveBlending:
gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );
break;
case MultiplyBlending:
gl.blendFunc( gl.ZERO, gl.SRC_COLOR );
break;
default:
console.error( 'THREE.WebGLState: Invalid blending: ', blending );
break;
}
}
currentBlendSrc = null;
currentBlendDst = null;
currentBlendSrcAlpha = null;
currentBlendDstAlpha = null;
currentBlendColor.set( 0, 0, 0 );
currentBlendAlpha = 0;
currentBlending = blending;
currentPremultipledAlpha = premultipliedAlpha;
}
return;
}
// custom blending
blendEquationAlpha = blendEquationAlpha || blendEquation;
blendSrcAlpha = blendSrcAlpha || blendSrc;
blendDstAlpha = blendDstAlpha || blendDst;
if ( blendEquation !== currentBlendEquation || blendEquationAlpha !== currentBlendEquationAlpha ) {
gl.blendEquationSeparate( equationToGL[ blendEquation ], equationToGL[ blendEquationAlpha ] );
currentBlendEquation = blendEquation;
currentBlendEquationAlpha = blendEquationAlpha;
}
if ( blendSrc !== currentBlendSrc || blendDst !== currentBlendDst || blendSrcAlpha !== currentBlendSrcAlpha || blendDstAlpha !== currentBlendDstAlpha ) {
gl.blendFuncSeparate( factorToGL[ blendSrc ], factorToGL[ blendDst ], factorToGL[ blendSrcAlpha ], factorToGL[ blendDstAlpha ] );
currentBlendSrc = blendSrc;
currentBlendDst = blendDst;
currentBlendSrcAlpha = blendSrcAlpha;
currentBlendDstAlpha = blendDstAlpha;
}
if ( blendColor.equals( currentBlendColor ) === false || blendAlpha !== currentBlendAlpha ) {
gl.blendColor( blendColor.r, blendColor.g, blendColor.b, blendAlpha );
currentBlendColor.copy( blendColor );
currentBlendAlpha = blendAlpha;
}
currentBlending = blending;
currentPremultipledAlpha = false;
}
function setMaterial( material, frontFaceCW ) {
material.side === DoubleSide
? disable( gl.CULL_FACE )
: enable( gl.CULL_FACE );
let flipSided = ( material.side === BackSide );
if ( frontFaceCW ) flipSided = ! flipSided;
setFlipSided( flipSided );
( material.blending === NormalBlending && material.transparent === false )
? setBlending( NoBlending )
: setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.blendColor, material.blendAlpha, material.premultipliedAlpha );
depthBuffer.setFunc( material.depthFunc );
depthBuffer.setTest( material.depthTest );
depthBuffer.setMask( material.depthWrite );
colorBuffer.setMask( material.colorWrite );
const stencilWrite = material.stencilWrite;
stencilBuffer.setTest( stencilWrite );
if ( stencilWrite ) {
stencilBuffer.setMask( material.stencilWriteMask );
stencilBuffer.setFunc( material.stencilFunc, material.stencilRef, material.stencilFuncMask );
stencilBuffer.setOp( material.stencilFail, material.stencilZFail, material.stencilZPass );
}
setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );
material.alphaToCoverage === true
? enable( gl.SAMPLE_ALPHA_TO_COVERAGE )
: disable( gl.SAMPLE_ALPHA_TO_COVERAGE );
}
//
function setFlipSided( flipSided ) {
if ( currentFlipSided !== flipSided ) {
if ( flipSided ) {
gl.frontFace( gl.CW );
} else {
gl.frontFace( gl.CCW );
}
currentFlipSided = flipSided;
}
}
function setCullFace( cullFace ) {
if ( cullFace !== CullFaceNone ) {
enable( gl.CULL_FACE );
if ( cullFace !== currentCullFace ) {
if ( cullFace === CullFaceBack ) {
gl.cullFace( gl.BACK );
} else if ( cullFace === CullFaceFront ) {
gl.cullFace( gl.FRONT );
} else {
gl.cullFace( gl.FRONT_AND_BACK );
}
}
} else {
disable( gl.CULL_FACE );
}
currentCullFace = cullFace;
}
function setLineWidth( width ) {
if ( width !== currentLineWidth ) {
if ( lineWidthAvailable ) gl.lineWidth( width );
currentLineWidth = width;
}
}
function setPolygonOffset( polygonOffset, factor, units ) {
if ( polygonOffset ) {
enable( gl.POLYGON_OFFSET_FILL );
if ( currentPolygonOffsetFactor !== factor || currentPolygonOffsetUnits !== units ) {
gl.polygonOffset( factor, units );
currentPolygonOffsetFactor = factor;
currentPolygonOffsetUnits = units;
}
} else {
disable( gl.POLYGON_OFFSET_FILL );
}
}
function setScissorTest( scissorTest ) {
if ( scissorTest ) {
enable( gl.SCISSOR_TEST );
} else {
disable( gl.SCISSOR_TEST );
}
}
// texture
function activeTexture( webglSlot ) {
if ( webglSlot === undefined ) webglSlot = gl.TEXTURE0 + maxTextures - 1;
if ( currentTextureSlot !== webglSlot ) {
gl.activeTexture( webglSlot );
currentTextureSlot = webglSlot;
}
}
function bindTexture( webglType, webglTexture, webglSlot ) {
if ( webglSlot === undefined ) {
if ( currentTextureSlot === null ) {
webglSlot = gl.TEXTURE0 + maxTextures - 1;
} else {
webglSlot = currentTextureSlot;
}
}
let boundTexture = currentBoundTextures[ webglSlot ];
if ( boundTexture === undefined ) {
boundTexture = { type: undefined, texture: undefined };
currentBoundTextures[ webglSlot ] = boundTexture;
}
if ( boundTexture.type !== webglType || boundTexture.texture !== webglTexture ) {
if ( currentTextureSlot !== webglSlot ) {
gl.activeTexture( webglSlot );
currentTextureSlot = webglSlot;
}
gl.bindTexture( webglType, webglTexture || emptyTextures[ webglType ] );
boundTexture.type = webglType;
boundTexture.texture = webglTexture;
}
}
function unbindTexture() {
const boundTexture = currentBoundTextures[ currentTextureSlot ];
if ( boundTexture !== undefined && boundTexture.type !== undefined ) {
gl.bindTexture( boundTexture.type, null );
boundTexture.type = undefined;
boundTexture.texture = undefined;
}
}
function compressedTexImage2D() {
try {
gl.compressedTexImage2D( ...arguments );
} catch ( error ) {
console.error( 'THREE.WebGLState:', error );
}
}
function compressedTexImage3D() {
try {
gl.compressedTexImage3D( ...arguments );
} catch ( error ) {