fireball/lib/renderers/webgl/WebGLState.js

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2018-12-25 13:59:22 +00:00
/**
* @author mrdoob / http://mrdoob.com/
*/
import { NotEqualDepth, GreaterDepth, GreaterEqualDepth, EqualDepth, LessEqualDepth, LessDepth, AlwaysDepth, NeverDepth, CullFaceFront, CullFaceBack, CullFaceNone, CustomBlending, MultiplyBlending, SubtractiveBlending, AdditiveBlending, NoBlending, NormalBlending, AddEquation, DoubleSide, BackSide } from '../../constants.js';
import { Vector4 } from '../../math/Vector4.js';
function WebGLState( gl, extensions, utils, capabilities ) {
function ColorBuffer() {
var locked = false;
var color = new Vector4();
var currentColorMask = null;
var 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() {
var locked = false;
var currentDepthMask = null;
var currentDepthFunc = null;
var currentDepthClear = null;
return {
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 ( currentDepthFunc !== depthFunc ) {
if ( 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 );
}
} else {
gl.depthFunc( gl.LEQUAL );
}
currentDepthFunc = depthFunc;
}
},
setLocked: function ( lock ) {
locked = lock;
},
setClear: function ( depth ) {
if ( currentDepthClear !== depth ) {
gl.clearDepth( depth );
currentDepthClear = depth;
}
},
reset: function () {
locked = false;
currentDepthMask = null;
currentDepthFunc = null;
currentDepthClear = null;
}
};
}
function StencilBuffer() {
var locked = false;
var currentStencilMask = null;
var currentStencilFunc = null;
var currentStencilRef = null;
var currentStencilFuncMask = null;
var currentStencilFail = null;
var currentStencilZFail = null;
var currentStencilZPass = null;
var currentStencilClear = null;
return {
setTest: function ( stencilTest ) {
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;
}
};
}
//
var colorBuffer = new ColorBuffer();
var depthBuffer = new DepthBuffer();
var stencilBuffer = new StencilBuffer();
var maxVertexAttributes = gl.getParameter( gl.MAX_VERTEX_ATTRIBS );
var newAttributes = new Uint8Array( maxVertexAttributes );
var enabledAttributes = new Uint8Array( maxVertexAttributes );
var attributeDivisors = new Uint8Array( maxVertexAttributes );
var enabledCapabilities = {};
var compressedTextureFormats = null;
var currentProgram = null;
var currentBlendingEnabled = null;
var currentBlending = null;
var currentBlendEquation = null;
var currentBlendSrc = null;
var currentBlendDst = null;
var currentBlendEquationAlpha = null;
var currentBlendSrcAlpha = null;
var currentBlendDstAlpha = null;
var currentPremultipledAlpha = false;
var currentFlipSided = null;
var currentCullFace = null;
var currentLineWidth = null;
var currentPolygonOffsetFactor = null;
var currentPolygonOffsetUnits = null;
var maxTextures = gl.getParameter( gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS );
var lineWidthAvailable = false;
var version = 0;
var glVersion = gl.getParameter( gl.VERSION );
if ( glVersion.indexOf( 'WebGL' ) !== - 1 ) {
version = parseFloat( /^WebGL\ ([0-9])/.exec( glVersion )[ 1 ] );
lineWidthAvailable = ( version >= 1.0 );
} else if ( glVersion.indexOf( 'OpenGL ES' ) !== - 1 ) {
version = parseFloat( /^OpenGL\ ES\ ([0-9])/.exec( glVersion )[ 1 ] );
lineWidthAvailable = ( version >= 2.0 );
}
var currentTextureSlot = null;
var currentBoundTextures = {};
var currentScissor = new Vector4();
var currentViewport = new Vector4();
function createTexture( type, target, count ) {
var data = new Uint8Array( 4 ); // 4 is required to match default unpack alignment of 4.
var 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 ( var i = 0; i < count; i ++ ) {
gl.texImage2D( target + i, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, data );
}
return texture;
}
var 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 );
// 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 initAttributes() {
for ( var i = 0, l = newAttributes.length; i < l; i ++ ) {
newAttributes[ i ] = 0;
}
}
function enableAttribute( attribute ) {
enableAttributeAndDivisor( attribute, 0 );
}
function enableAttributeAndDivisor( attribute, meshPerAttribute ) {
newAttributes[ attribute ] = 1;
if ( enabledAttributes[ attribute ] === 0 ) {
gl.enableVertexAttribArray( attribute );
enabledAttributes[ attribute ] = 1;
}
if ( attributeDivisors[ attribute ] !== meshPerAttribute ) {
var extension = capabilities.isWebGL2 ? gl : extensions.get( 'ANGLE_instanced_arrays' );
extension[ capabilities.isWebGL2 ? 'vertexAttribDivisor' : 'vertexAttribDivisorANGLE' ]( attribute, meshPerAttribute );
attributeDivisors[ attribute ] = meshPerAttribute;
}
}
function disableUnusedAttributes() {
for ( var i = 0, l = enabledAttributes.length; i !== l; ++ i ) {
if ( enabledAttributes[ i ] !== newAttributes[ i ] ) {
gl.disableVertexAttribArray( i );
enabledAttributes[ i ] = 0;
}
}
}
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 getCompressedTextureFormats() {
if ( compressedTextureFormats === null ) {
compressedTextureFormats = [];
if ( extensions.get( 'WEBGL_compressed_texture_pvrtc' ) ||
extensions.get( 'WEBGL_compressed_texture_s3tc' ) ||
extensions.get( 'WEBGL_compressed_texture_etc1' ) ||
extensions.get( 'WEBGL_compressed_texture_astc' ) ) {
var formats = gl.getParameter( gl.COMPRESSED_TEXTURE_FORMATS );
for ( var i = 0; i < formats.length; i ++ ) {
compressedTextureFormats.push( formats[ i ] );
}
}
}
return compressedTextureFormats;
}
function useProgram( program ) {
if ( currentProgram !== program ) {
gl.useProgram( program );
currentProgram = program;
return true;
}
return false;
}
function setBlending( blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, premultipliedAlpha ) {
if ( blending === NoBlending ) {
if ( currentBlendingEnabled ) {
disable( gl.BLEND );
currentBlendingEnabled = false;
}
return;
}
if ( ! currentBlendingEnabled ) {
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.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ONE_MINUS_SRC_ALPHA );
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.blendFunc( gl.ZERO, gl.ONE_MINUS_SRC_COLOR );
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;
currentBlending = blending;
currentPremultipledAlpha = premultipliedAlpha;
}
return;
}
// custom blending
blendEquationAlpha = blendEquationAlpha || blendEquation;
blendSrcAlpha = blendSrcAlpha || blendSrc;
blendDstAlpha = blendDstAlpha || blendDst;
if ( blendEquation !== currentBlendEquation || blendEquationAlpha !== currentBlendEquationAlpha ) {
gl.blendEquationSeparate( utils.convert( blendEquation ), utils.convert( blendEquationAlpha ) );
currentBlendEquation = blendEquation;
currentBlendEquationAlpha = blendEquationAlpha;
}
if ( blendSrc !== currentBlendSrc || blendDst !== currentBlendDst || blendSrcAlpha !== currentBlendSrcAlpha || blendDstAlpha !== currentBlendDstAlpha ) {
gl.blendFuncSeparate( utils.convert( blendSrc ), utils.convert( blendDst ), utils.convert( blendSrcAlpha ), utils.convert( blendDstAlpha ) );
currentBlendSrc = blendSrc;
currentBlendDst = blendDst;
currentBlendSrcAlpha = blendSrcAlpha;
currentBlendDstAlpha = blendDstAlpha;
}
currentBlending = blending;
currentPremultipledAlpha = null;
}
function setMaterial( material, frontFaceCW ) {
material.side === DoubleSide
? disable( gl.CULL_FACE )
: enable( gl.CULL_FACE );
var 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.premultipliedAlpha );
depthBuffer.setFunc( material.depthFunc );
depthBuffer.setTest( material.depthTest );
depthBuffer.setMask( material.depthWrite );
colorBuffer.setMask( material.colorWrite );
setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );
}
//
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 ) {
if ( currentTextureSlot === null ) {
activeTexture();
}
var boundTexture = currentBoundTextures[ currentTextureSlot ];
if ( boundTexture === undefined ) {
boundTexture = { type: undefined, texture: undefined };
currentBoundTextures[ currentTextureSlot ] = boundTexture;
}
if ( boundTexture.type !== webglType || boundTexture.texture !== webglTexture ) {
gl.bindTexture( webglType, webglTexture || emptyTextures[ webglType ] );
boundTexture.type = webglType;
boundTexture.texture = webglTexture;
}
}
function compressedTexImage2D() {
try {
gl.compressedTexImage2D.apply( gl, arguments );
} catch ( error ) {
console.error( 'THREE.WebGLState:', error );
}
}
function texImage2D() {
try {
gl.texImage2D.apply( gl, arguments );
} catch ( error ) {
console.error( 'THREE.WebGLState:', error );
}
}
function texImage3D() {
try {
gl.texImage3D.apply( gl, arguments );
} catch ( error ) {
console.error( 'THREE.WebGLState:', error );
}
}
//
function scissor( scissor ) {
if ( currentScissor.equals( scissor ) === false ) {
gl.scissor( scissor.x, scissor.y, scissor.z, scissor.w );
currentScissor.copy( scissor );
}
}
function viewport( viewport ) {
if ( currentViewport.equals( viewport ) === false ) {
gl.viewport( viewport.x, viewport.y, viewport.z, viewport.w );
currentViewport.copy( viewport );
}
}
//
function reset() {
for ( var i = 0; i < enabledAttributes.length; i ++ ) {
if ( enabledAttributes[ i ] === 1 ) {
gl.disableVertexAttribArray( i );
enabledAttributes[ i ] = 0;
}
}
enabledCapabilities = {};
compressedTextureFormats = null;
currentTextureSlot = null;
currentBoundTextures = {};
currentProgram = null;
currentBlending = null;
currentFlipSided = null;
currentCullFace = null;
colorBuffer.reset();
depthBuffer.reset();
stencilBuffer.reset();
}
return {
buffers: {
color: colorBuffer,
depth: depthBuffer,
stencil: stencilBuffer
},
initAttributes: initAttributes,
enableAttribute: enableAttribute,
enableAttributeAndDivisor: enableAttributeAndDivisor,
disableUnusedAttributes: disableUnusedAttributes,
enable: enable,
disable: disable,
getCompressedTextureFormats: getCompressedTextureFormats,
useProgram: useProgram,
setBlending: setBlending,
setMaterial: setMaterial,
setFlipSided: setFlipSided,
setCullFace: setCullFace,
setLineWidth: setLineWidth,
setPolygonOffset: setPolygonOffset,
setScissorTest: setScissorTest,
activeTexture: activeTexture,
bindTexture: bindTexture,
compressedTexImage2D: compressedTexImage2D,
texImage2D: texImage2D,
texImage3D: texImage3D,
scissor: scissor,
viewport: viewport,
reset: reset
};
}
export { WebGLState };