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Senad Uka
2017-03-11 15:22:17 +01:00
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node_modules/three/examples/js/pmrem/PMREMCubeUVPacker.js generated vendored Normal file
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/**
* @author Prashant Sharma / spidersharma03
* @author Ben Houston / bhouston, https://clara.io
*
* This class takes the cube lods(corresponding to different roughness values), and creates a single cubeUV
* Texture. The format for a given roughness set of faces is simply::
* +X+Y+Z
* -X-Y-Z
* For every roughness a mip map chain is also saved, which is essential to remove the texture artifacts due to
* minification.
* Right now for every face a PlaneMesh is drawn, which leads to a lot of geometry draw calls, but can be replaced
* later by drawing a single buffer and by sending the appropriate faceIndex via vertex attributes.
* The arrangement of the faces is fixed, as assuming this arrangement, the sampling function has been written.
*/
THREE.PMREMCubeUVPacker = function( cubeTextureLods, numLods ) {
this.cubeLods = cubeTextureLods;
this.numLods = numLods;
var size = cubeTextureLods[ 0 ].width * 4;
var sourceTexture = cubeTextureLods[ 0 ].texture;
var params = {
format: sourceTexture.format,
magFilter: sourceTexture.magFilter,
minFilter: sourceTexture.minFilter,
type: sourceTexture.type,
generateMipmaps: sourceTexture.generateMipmaps,
anisotropy: sourceTexture.anisotropy,
encoding: sourceTexture.encoding
};
if( sourceTexture.encoding === THREE.RGBM16Encoding ) {
params.magFilter = THREE.LinearFilter;
params.minFilter = THREE.LinearFilter;
}
this.CubeUVRenderTarget = new THREE.WebGLRenderTarget( size, size, params );
this.CubeUVRenderTarget.texture.name = "PMREMCubeUVPacker.cubeUv";
this.CubeUVRenderTarget.texture.mapping = THREE.CubeUVReflectionMapping;
this.camera = new THREE.OrthographicCamera( - size * 0.5, size * 0.5, - size * 0.5, size * 0.5, 0.0, 1000 );
this.scene = new THREE.Scene();
this.scene.add( this.camera );
this.objects = [];
var xOffset = 0;
var faceOffsets = [];
faceOffsets.push( new THREE.Vector2( 0, 0 ) );
faceOffsets.push( new THREE.Vector2( 1, 0 ) );
faceOffsets.push( new THREE.Vector2( 2, 0 ) );
faceOffsets.push( new THREE.Vector2( 0, 1 ) );
faceOffsets.push( new THREE.Vector2( 1, 1 ) );
faceOffsets.push( new THREE.Vector2( 2, 1 ) );
var yOffset = 0;
var textureResolution = size;
size = cubeTextureLods[ 0 ].width;
var offset2 = 0;
var c = 4.0;
this.numLods = Math.log( cubeTextureLods[ 0 ].width ) / Math.log( 2 ) - 2; // IE11 doesn't support Math.log2
for ( var i = 0; i < this.numLods; i ++ ) {
var offset1 = ( textureResolution - textureResolution / c ) * 0.5;
if ( size > 16 )
c *= 2;
var nMips = size > 16 ? 6 : 1;
var mipOffsetX = 0;
var mipOffsetY = 0;
var mipSize = size;
for ( var j = 0; j < nMips; j ++ ) {
// Mip Maps
for ( var k = 0; k < 6; k ++ ) {
// 6 Cube Faces
var material = this.getShader();
material.uniforms[ 'envMap' ].value = this.cubeLods[ i ].texture;
material.envMap = this.cubeLods[ i ].texture;
material.uniforms[ 'faceIndex' ].value = k;
material.uniforms[ 'mapSize' ].value = mipSize;
var color = material.uniforms[ 'testColor' ].value;
//color.copy(testColor[j]);
var planeMesh = new THREE.Mesh(
new THREE.PlaneGeometry( mipSize, mipSize, 0 ),
material );
planeMesh.position.x = faceOffsets[ k ].x * mipSize - offset1 + mipOffsetX;
planeMesh.position.y = faceOffsets[ k ].y * mipSize - offset1 + offset2 + mipOffsetY;
planeMesh.material.side = THREE.DoubleSide;
this.scene.add( planeMesh );
this.objects.push( planeMesh );
}
mipOffsetY += 1.75 * mipSize;
mipOffsetX += 1.25 * mipSize;
mipSize /= 2;
}
offset2 += 2 * size;
if ( size > 16 )
size /= 2;
}
};
THREE.PMREMCubeUVPacker.prototype = {
constructor : THREE.PMREMCubeUVPacker,
update: function( renderer ) {
var gammaInput = renderer.gammaInput;
var gammaOutput = renderer.gammaOutput;
var toneMapping = renderer.toneMapping;
var toneMappingExposure = renderer.toneMappingExposure;
renderer.gammaInput = false;
renderer.gammaOutput = false;
renderer.toneMapping = THREE.LinearToneMapping;
renderer.toneMappingExposure = 1.0;
renderer.render( this.scene, this.camera, this.CubeUVRenderTarget, false );
renderer.toneMapping = toneMapping;
renderer.toneMappingExposure = toneMappingExposure;
renderer.gammaInput = gammaInput;
renderer.gammaOutput = gammaOutput;
},
getShader: function() {
var shaderMaterial = new THREE.ShaderMaterial( {
uniforms: {
"faceIndex": { value: 0 },
"mapSize": { value: 0 },
"envMap": { value: null },
"testColor": { value: new THREE.Vector3( 1, 1, 1 ) }
},
vertexShader:
"precision highp float;\
varying vec2 vUv;\
void main() {\
vUv = uv;\
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\
}",
fragmentShader:
"precision highp float;\
varying vec2 vUv;\
uniform samplerCube envMap;\
uniform float mapSize;\
uniform vec3 testColor;\
uniform int faceIndex;\
\
void main() {\
vec3 sampleDirection;\
vec2 uv = vUv;\
uv = uv * 2.0 - 1.0;\
uv.y *= -1.0;\
if(faceIndex == 0) {\
sampleDirection = normalize(vec3(1.0, uv.y, -uv.x));\
} else if(faceIndex == 1) {\
sampleDirection = normalize(vec3(uv.x, 1.0, uv.y));\
} else if(faceIndex == 2) {\
sampleDirection = normalize(vec3(uv.x, uv.y, 1.0));\
} else if(faceIndex == 3) {\
sampleDirection = normalize(vec3(-1.0, uv.y, uv.x));\
} else if(faceIndex == 4) {\
sampleDirection = normalize(vec3(uv.x, -1.0, -uv.y));\
} else {\
sampleDirection = normalize(vec3(-uv.x, uv.y, -1.0));\
}\
vec4 color = envMapTexelToLinear( textureCube( envMap, sampleDirection ) );\
gl_FragColor = linearToOutputTexel( color );\
}",
blending: THREE.CustomBlending,
premultipliedAlpha: false,
blendSrc: THREE.OneFactor,
blendDst: THREE.ZeroFactor,
blendSrcAlpha: THREE.OneFactor,
blendDstAlpha: THREE.ZeroFactor,
blendEquation: THREE.AddEquation
} );
return shaderMaterial;
}
};

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node_modules/three/examples/js/pmrem/PMREMGenerator.js generated vendored Normal file
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/**
* @author Prashant Sharma / spidersharma03
* @author Ben Houston / bhouston, https://clara.io
*
* To avoid cube map seams, I create an extra pixel around each face. This way when the cube map is
* sampled by an application later(with a little care by sampling the centre of the texel), the extra 1 border
* of pixels makes sure that there is no seams artifacts present. This works perfectly for cubeUV format as
* well where the 6 faces can be arranged in any manner whatsoever.
* Code in the beginning of fragment shader's main function does this job for a given resolution.
* Run Scene_PMREM_Test.html in the examples directory to see the sampling from the cube lods generated
* by this class.
*/
THREE.PMREMGenerator = function( sourceTexture, samplesPerLevel, resolution ) {
this.sourceTexture = sourceTexture;
this.resolution = ( resolution !== undefined ) ? resolution : 256; // NODE: 256 is currently hard coded in the glsl code for performance reasons
this.samplesPerLevel = ( samplesPerLevel !== undefined ) ? samplesPerLevel : 16;
var monotonicEncoding = ( sourceTexture.encoding === THREE.LinearEncoding ) ||
( sourceTexture.encoding === THREE.GammaEncoding ) || ( sourceTexture.encoding === THREE.sRGBEncoding );
this.sourceTexture.minFilter = ( monotonicEncoding ) ? THREE.LinearFilter : THREE.NearestFilter;
this.sourceTexture.magFilter = ( monotonicEncoding ) ? THREE.LinearFilter : THREE.NearestFilter;
this.sourceTexture.generateMipmaps = this.sourceTexture.generateMipmaps && monotonicEncoding;
this.cubeLods = [];
var size = this.resolution;
var params = {
format: this.sourceTexture.format,
magFilter: this.sourceTexture.magFilter,
minFilter: this.sourceTexture.minFilter,
type: this.sourceTexture.type,
generateMipmaps: this.sourceTexture.generateMipmaps,
anisotropy: this.sourceTexture.anisotropy,
encoding: this.sourceTexture.encoding
};
// how many LODs fit in the given CubeUV Texture.
this.numLods = Math.log( size ) / Math.log( 2 ) - 2; // IE11 doesn't support Math.log2
for ( var i = 0; i < this.numLods; i ++ ) {
var renderTarget = new THREE.WebGLRenderTargetCube( size, size, params );
renderTarget.texture.name = "PMREMGenerator.cube" + i;
this.cubeLods.push( renderTarget );
size = Math.max( 16, size / 2 );
}
this.camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0.0, 1000 );
this.shader = this.getShader();
this.shader.defines['SAMPLES_PER_LEVEL'] = this.samplesPerLevel;
this.planeMesh = new THREE.Mesh( new THREE.PlaneGeometry( 2, 2, 0 ), this.shader );
this.planeMesh.material.side = THREE.DoubleSide;
this.scene = new THREE.Scene();
this.scene.add( this.planeMesh );
this.scene.add( this.camera );
this.shader.uniforms[ 'envMap' ].value = this.sourceTexture;
this.shader.envMap = this.sourceTexture;
};
THREE.PMREMGenerator.prototype = {
constructor : THREE.PMREMGenerator,
/*
* Prashant Sharma / spidersharma03: More thought and work is needed here.
* Right now it's a kind of a hack to use the previously convolved map to convolve the current one.
* I tried to use the original map to convolve all the lods, but for many textures(specially the high frequency)
* even a high number of samples(1024) dosen't lead to satisfactory results.
* By using the previous convolved maps, a lower number of samples are generally sufficient(right now 32, which
* gives okay results unless we see the reflection very carefully, or zoom in too much), however the math
* goes wrong as the distribution function tries to sample a larger area than what it should be. So I simply scaled
* the roughness by 0.9(totally empirical) to try to visually match the original result.
* The condition "if(i <5)" is also an attemt to make the result match the original result.
* This method requires the most amount of thinking I guess. Here is a paper which we could try to implement in future::
* http://http.developer.nvidia.com/GPUGems3/gpugems3_ch20.html
*/
update: function( renderer ) {
this.shader.uniforms[ 'envMap' ].value = this.sourceTexture;
this.shader.envMap = this.sourceTexture;
var gammaInput = renderer.gammaInput;
var gammaOutput = renderer.gammaOutput;
var toneMapping = renderer.toneMapping;
var toneMappingExposure = renderer.toneMappingExposure;
renderer.toneMapping = THREE.LinearToneMapping;
renderer.toneMappingExposure = 1.0;
renderer.gammaInput = false;
renderer.gammaOutput = false;
for ( var i = 0; i < this.numLods; i ++ ) {
var r = i / ( this.numLods - 1 );
this.shader.uniforms[ 'roughness' ].value = r * 0.9; // see comment above, pragmatic choice
this.shader.uniforms[ 'queryScale' ].value.x = ( i == 0 ) ? -1 : 1;
var size = this.cubeLods[ i ].width;
this.shader.uniforms[ 'mapSize' ].value = size;
this.renderToCubeMapTarget( renderer, this.cubeLods[ i ] );
if ( i < 5 ) this.shader.uniforms[ 'envMap' ].value = this.cubeLods[ i ].texture;
}
renderer.toneMapping = toneMapping;
renderer.toneMappingExposure = toneMappingExposure;
renderer.gammaInput = gammaInput;
renderer.gammaOutput = gammaOutput;
},
renderToCubeMapTarget: function( renderer, renderTarget ) {
for ( var i = 0; i < 6; i ++ ) {
this.renderToCubeMapTargetFace( renderer, renderTarget, i )
}
},
renderToCubeMapTargetFace: function( renderer, renderTarget, faceIndex ) {
renderTarget.activeCubeFace = faceIndex;
this.shader.uniforms[ 'faceIndex' ].value = faceIndex;
renderer.render( this.scene, this.camera, renderTarget, true );
},
getShader: function() {
return new THREE.ShaderMaterial( {
defines: {
"SAMPLES_PER_LEVEL": 20,
},
uniforms: {
"faceIndex": { value: 0 },
"roughness": { value: 0.5 },
"mapSize": { value: 0.5 },
"envMap": { value: null },
"queryScale": { value: new THREE.Vector3( 1, 1, 1 ) },
"testColor": { value: new THREE.Vector3( 1, 1, 1 ) },
},
vertexShader:
"varying vec2 vUv;\n\
void main() {\n\
vUv = uv;\n\
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n\
}",
fragmentShader:
"#include <common>\n\
varying vec2 vUv;\n\
uniform int faceIndex;\n\
uniform float roughness;\n\
uniform samplerCube envMap;\n\
uniform float mapSize;\n\
uniform vec3 testColor;\n\
uniform vec3 queryScale;\n\
\n\
float GGXRoughnessToBlinnExponent( const in float ggxRoughness ) {\n\
float a = ggxRoughness + 0.0001;\n\
a *= a;\n\
return ( 2.0 / a - 2.0 );\n\
}\n\
vec3 ImportanceSamplePhong(vec2 uv, mat3 vecSpace, float specPow) {\n\
float phi = uv.y * 2.0 * PI;\n\
float cosTheta = pow(1.0 - uv.x, 1.0 / (specPow + 1.0));\n\
float sinTheta = sqrt(1.0 - cosTheta * cosTheta);\n\
vec3 sampleDir = vec3(cos(phi) * sinTheta, sin(phi) * sinTheta, cosTheta);\n\
return vecSpace * sampleDir;\n\
}\n\
vec3 ImportanceSampleGGX( vec2 uv, mat3 vecSpace, float Roughness )\n\
{\n\
float a = Roughness * Roughness;\n\
float Phi = 2.0 * PI * uv.x;\n\
float CosTheta = sqrt( (1.0 - uv.y) / ( 1.0 + (a*a - 1.0) * uv.y ) );\n\
float SinTheta = sqrt( 1.0 - CosTheta * CosTheta );\n\
return vecSpace * vec3(SinTheta * cos( Phi ), SinTheta * sin( Phi ), CosTheta);\n\
}\n\
mat3 matrixFromVector(vec3 n) {\n\
float a = 1.0 / (1.0 + n.z);\n\
float b = -n.x * n.y * a;\n\
vec3 b1 = vec3(1.0 - n.x * n.x * a, b, -n.x);\n\
vec3 b2 = vec3(b, 1.0 - n.y * n.y * a, -n.y);\n\
return mat3(b1, b2, n);\n\
}\n\
\n\
vec4 testColorMap(float Roughness) {\n\
vec4 color;\n\
if(faceIndex == 0)\n\
color = vec4(1.0,0.0,0.0,1.0);\n\
else if(faceIndex == 1)\n\
color = vec4(0.0,1.0,0.0,1.0);\n\
else if(faceIndex == 2)\n\
color = vec4(0.0,0.0,1.0,1.0);\n\
else if(faceIndex == 3)\n\
color = vec4(1.0,1.0,0.0,1.0);\n\
else if(faceIndex == 4)\n\
color = vec4(0.0,1.0,1.0,1.0);\n\
else\n\
color = vec4(1.0,0.0,1.0,1.0);\n\
color *= ( 1.0 - Roughness );\n\
return color;\n\
}\n\
void main() {\n\
vec3 sampleDirection;\n\
vec2 uv = vUv*2.0 - 1.0;\n\
float offset = -1.0/mapSize;\n\
const float a = -1.0;\n\
const float b = 1.0;\n\
float c = -1.0 + offset;\n\
float d = 1.0 - offset;\n\
float bminusa = b - a;\n\
uv.x = (uv.x - a)/bminusa * d - (uv.x - b)/bminusa * c;\n\
uv.y = (uv.y - a)/bminusa * d - (uv.y - b)/bminusa * c;\n\
if (faceIndex==0) {\n\
sampleDirection = vec3(1.0, -uv.y, -uv.x);\n\
} else if (faceIndex==1) {\n\
sampleDirection = vec3(-1.0, -uv.y, uv.x);\n\
} else if (faceIndex==2) {\n\
sampleDirection = vec3(uv.x, 1.0, uv.y);\n\
} else if (faceIndex==3) {\n\
sampleDirection = vec3(uv.x, -1.0, -uv.y);\n\
} else if (faceIndex==4) {\n\
sampleDirection = vec3(uv.x, -uv.y, 1.0);\n\
} else {\n\
sampleDirection = vec3(-uv.x, -uv.y, -1.0);\n\
}\n\
mat3 vecSpace = matrixFromVector(normalize(sampleDirection * queryScale));\n\
vec3 rgbColor = vec3(0.0);\n\
const int NumSamples = SAMPLES_PER_LEVEL;\n\
vec3 vect;\n\
float weight = 0.0;\n\
for( int i = 0; i < NumSamples; i ++ ) {\n\
float sini = sin(float(i));\n\
float cosi = cos(float(i));\n\
float r = rand(vec2(sini, cosi));\n\
vect = ImportanceSampleGGX(vec2(float(i) / float(NumSamples), r), vecSpace, roughness);\n\
float dotProd = dot(vect, normalize(sampleDirection));\n\
weight += dotProd;\n\
vec3 color = envMapTexelToLinear(textureCube(envMap,vect)).rgb;\n\
rgbColor.rgb += color;\n\
}\n\
rgbColor /= float(NumSamples);\n\
//rgbColor = testColorMap( roughness ).rgb;\n\
gl_FragColor = linearToOutputTexel( vec4( rgbColor, 1.0 ) );\n\
}",
blending: THREE.CustomBlending,
blendSrc: THREE.OneFactor,
blendDst: THREE.ZeroFactor,
blendSrcAlpha: THREE.OneFactor,
blendDstAlpha: THREE.ZeroFactor,
blendEquation: THREE.AddEquation
} );
}
};