WebGL PBR OSG.JS

Cedricpinson. Making. IO/osgjs – websi…

Vertex shader

#version 100
#ifdef GL_FRAGMENT_PRECISION_HIGH
    precision highp float;
#else
    precision mediump float;
#endif

attribute vec3 Vertex;
attribute vec3 Normal;
attribute vec2 TexCoord0;
attribute vec4 Tangent;
attribute vec4 Color;
uniform mat4 uModelViewMatrix;
uniform mat4 uProjectionMatrix;
uniform mat3 uModelViewNormalMatrix;
varying vec3 vViewVertex;
varying vec3 vViewNormal;
varying vec4 vViewTangent;
varying vec2 vTexCoord0;
varying vec4 vVertexColor;
void main(void) {
    vViewVertex = vec3(uModelViewMatrix * vec4(Vertex, 1.0));
    vViewNormal = uModelViewNormalMatrix * Normal; // The estimate of the normal vector in viewport space is the inverse transpose
    vViewTangent = vec4(uModelViewNormalMatrix * Tangent.xyz, Tangent.w); // The tangent space under viewport space
    vTexCoord0 = TexCoord0;
    vVertexColor = Color; // Vertex color
    gl_Position = uProjectionMatrix * uModelViewMatrix * vec4(Vertex, 1.0); // The coordinates of the projection space
}
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Chip shader

void main(void) {
    vec3 normal = normalize(vViewNormal); // The normal line in viewport space
    vec3 eye = normalize(vViewVertex); // Coordinate in viewport space
    vec4 tangent = vViewTangent; // Tangent space
    vec2 uv = vTexCoord0.xy; //uv
    environmentTransform = getEnvironmentTransfrom( uEnvironmentTransform ); // Get the UV 3x3 matrix
    const vec3 dielectricColor = vec3(0.04); //F0 = minimum
    float minRoughness = 1.e-4; // Minimum roughness
    vec4 albedoSource = texture2D( albedoMap, uv ); //
    albedoSource.a *= uBaseColorFactor.a;
    vec3 albedo = sRGBToLinear( albedoSource.rgb, DefaultGamma ) * uBaseColorFactor.rgb;
    #ifdef VERTEX_COLOR
        vec3 vertexColorLinear = sRGBToLinear( vVertexColor.rgb, DefaultGamma );
        // Check non zero non completely transparent
        
        if(vertexColorLinear.rgb ! = vec3(0.0) && vVertexColor.a ! = 0.0) {
            albedo *= vertexColorLinear;
            albedoSource.a *= vVertexColor.a;
        }
    #endif
    
    #ifdef NORMAL
        vec3 normalTexel = texture2D( normalMap, uv ).rgb;
        if ( length(normalTexel) > 0.0001 ) {
            vec3 realNormal = textureNormal( normalTexel );
            normal = computeNormalFromTangentSpaceNormalMap( tangent, normal, realNormal );
        }
    #endif
    
    #ifdef SPECULAR_GLOSSINESS
        float roughness = texture2D( metallicRoughnessMap, uv ).a * uGlossinessFactor;
        roughness = 1.0 - roughness;
    #else
        float roughness = texture2D( metallicRoughnessMap, uv ).g * uRoughnessFactor;
    #endif
    
    roughness = max( minRoughness, roughness );
    float ao = 1.0;
    #ifdef NORMAL
        if ( uNormalAA == 1 ) {
            roughness = adjustRoughness( roughness, normalTexel);
        }
    #endif
    
    #ifdef AO
        ao = texture2D( aoMap, uv ).r;
    #endif
    vec3 specular;
    #ifdef SPECULAR
        specular = sRGBToLinear( texture2D( specularMap, uv ), DefaultGamma ).rgb * uSpecularFactor;
    #else 
        #ifdef SPECULAR_GLOSSINESS
            specular = sRGBToLinear( texture2D( metallicRoughnessMap, uv ), DefaultGamma ).rgb * uSpecularFactor;
        #else
            float metallic = texture2D( metallicRoughnessMap, uv ).b * uMetallicFactor;
            vec3 albedoReduced = albedo * (1.0 - metallic);
            specular = mix( dielectricColor, albedo, metallic);
            albedo = albedoReduced;
        #endif
    #endif
    vec3 resultIBL = computeIBL_UE4( normal, -eye, albedo, roughness, specular, ao );
    #ifdef EMISSIVE
        vec3 emissiveChannel = sRGBToLinear( texture2D( emissiveMap, uv ), DefaultGamma ).rgb * uEmissiveFactor;
        resultIBL = resultIBL + emissiveChannel;
    #endif
    vec4 result = vec4( resultIBL, albedoSource.a );
    gl_FragColor = linearTosRGB(result, DefaultGamma );
}
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#version 100
#ifdef GL_FRAGMENT_PRECISION_HIGH
    precision highp float;
#else
    precision mediump float;
#endif
#define CUBEMAP_LOD 
#define LUV
#define NO_TANGENT
# define PI (3.1415926535897932384626433832795)
# define PI_2 (2.0 * 3.1415926535897932384626433832795)
# define INV_PI 1.0 / PI
# define INV_LOG2 1.4426950408889634073599246810019

uniform mat4 uEnvironmentTransform;
#ifdef CUBEMAP_LOD
    uniform samplerCube uEnvironmentCube;
    #extension GL_EXT_shader_texture_lod : enable
#endif

#ifdef PANORAMA
    uniform sampler2D uEnvironment;
#endif

uniform vec2 uEnvironmentSize;
uniform vec2 uEnvironmentLodRange;
uniform float uLod;
uniform float uBrightness;
uniform sampler2D uIntegrateBRDF; // ue4


uniform vec3 uEnvironmentSphericalHarmonics[9];
varying vec3 vViewVertex;
varying vec3 vViewNormal;
varying vec2 vTexCoord0;
varying vec4 vViewTangent;
varying vec4 vVertexColor;
mat3 environmentTransform;
uniform sampler2D albedoMap;
uniform sampler2D metallicRoughnessMap;
uniform sampler2D normalMap;
uniform sampler2D specularMap;
uniform sampler2D aoMap;
uniform sampler2D emissiveMap;
uniform vec4 uBaseColorFactor;
uniform vec3 uEmissiveFactor;
uniform vec3 uSpecularFactor;
uniform float uGlossinessFactor;
uniform float uMetallicFactor;
uniform float uRoughnessFactor;
uniform int uNormalAA;
uniform int uSpecularPeak;
uniform int uOcclusionHorizon;
#ifdef DEBUG
    # define PI (3.1415926535897932384626433832795)
    
    vec3 shCoefs[9];
    void createCoef() {
        / / vec3 (1.0 / (2.0 * SQRT (PI))), / / vec3 (- (SQRT (3.0 / PI) * 0.5 * y)), / / vec3 ((SQRT (3.0 / PI) * 0.5 * z)), / / vec3 (- (SQRT (3.0 / PI) * 0.5 * x)), / / vec3 ((SQRT (15.0 / PI) * 0.5 * x * y)), / / vec3 (- (SQRT (15.0 / PI) * 0.5 * * y z)), / / vec3 ((SQRT (5.0 / PI) * 0.25 * (3.0 1.0) * * z z)), / / vec3 (- (SQRT (15.0 / PI) * 0.5 * x * z)), / / vec3 ((SQRT (15.0 / PI) * 0.25 * (x * x - y * y))), ShCoefs [0] = vec3(1.0/(2.0* SQRT (PI)));
        shCoefs[1] = vec3( -( sqrt(3.0/PI)*0.5)); shCoefs[2] = -shCoefs[1];
        shCoefs[3] = shCoefs[1];
        shCoefs[4] = vec3( sqrt(15.0/PI)*0.5 );
        shCoefs[5] = -shCoefs[4];
        shCoefs[6] = vec3( sqrt(5.0/PI)* 0.25 );
        shCoefs[7] = shCoefs[5];
        shCoefs[8] = vec3( sqrt(15.0/PI) * 0.25 );
    }
    vec3 sphericalHarmonics( const in vec3 normal ) {
        float x = normal.x;
        float y = normal.y;
        float z = normal.z;
        createCoef();
        vec3 result = (
        shCoefs[0] * uSph[0] +
        
        shCoefs[1] * uSph[1] * y +
        shCoefs[2] * uSph[2] * z +
        shCoefs[3] * uSph[3] * x +
        
        shCoefs[4] * uSph[4] * y * x +
        shCoefs[5] * uSph[5] * y * z +
        shCoefs[6] * uSph[6] * (3.0 * z * z - 1.0) +
        shCoefs[7] * uSph[7] * (z * x) +
        shCoefs[8] * uSph[8] * (x*x - y*y)
        );
    }
#else
    // expect shCoefs uniform
    // https://github.com/cedricpinson/envtools/blob/master/Cubemap.cpp#L523
    vec3 sphericalHarmonics( const vec3 sph[9].const in vec3 normal ) {
        float x = normal.x;
        float y = normal.y;
        float z = normal.z;
        vec3 result = (
        sph[0] +
        
        sph[1] * y +
        sph[2] * z +
        sph[3] * x +
        
        sph[4] * y * x +
        sph[5] * y * z +
        sph[6] * (3.0 * z * z - 1.0) +
        sph[7] * (z * x) +
        sph[8] * (x*x - y*y)
        );
        return max(result, vec3(0.0));
    }
#endif


# define DefaultGamma 2.4

float linearrgb_to_srgb1(const in float c, const in float gamma) {
    float v = 0.0;
    if(c < 0.0031308) {
        if ( c > 0.0)
        v = c * 12.92;
    }
    else {
        v = 1.055 * pow(c, 1.0/ gamma) - 0.055;
    }
    return v;
}
// coding style should be camel case except for acronyme like SRGB or HDR
vec4 linearTosRGB(const in vec4 col_from, const in float gamma) {
    vec4 col_to;
    col_to.r = linearrgb_to_srgb1(col_from.r, gamma);
    col_to.g = linearrgb_to_srgb1(col_from.g, gamma);
    col_to.b = linearrgb_to_srgb1(col_from.b, gamma);
    col_to.a = col_from.a;
    return col_to;
}
vec3 linearTosRGB(const in vec3 col_from, const in float gamma) {
    vec3 col_to;
    col_to.r = linearrgb_to_srgb1(col_from.r, gamma);
    col_to.g = linearrgb_to_srgb1(col_from.g, gamma);
    col_to.b = linearrgb_to_srgb1(col_from.b, gamma);
    return col_to;
}
float sRGBToLinear(const in float c, const in float gamma) {
    float v = 0.0;
    if ( c < 0.04045 ) {
        if ( c >= 0.0 )
        v = c * ( 1.0 / 12.92 );
    }
    else {
        v = pow( ( c + 0.055 ) * ( 1.0 / 1.055 ), gamma );
    }
    return v;
}
vec4 sRGBToLinear(const in vec4 col_from, const in float gamma) {
    vec4 col_to;
    col_to.r = sRGBToLinear(col_from.r, gamma);
    col_to.g = sRGBToLinear(col_from.g, gamma);
    col_to.b = sRGBToLinear(col_from.b, gamma);
    col_to.a = col_from.a;
    return col_to;
}
vec3 sRGBToLinear(const in vec3 col_from, const in float gamma) {
    vec3 col_to;
    col_to.r = sRGBToLinear(col_from.r, gamma);
    col_to.g = sRGBToLinear(col_from.g, gamma);
    col_to.b = sRGBToLinear(col_from.b, gamma);
    return col_to;
}
vec3 RGBEToRGB( const in vec4 rgba ) {
    float f = pow(2.0, rgba.w * 255.0 - (128.0 + 8.0));
    return rgba.rgb * (255.0 * f);
}
//http://graphicrants.blogspot.fr/2009/04/rgbm-color-encoding.html
vec3 RGBMToRGB( const in vec4 rgba ) {
    const float maxRange = 8.0;
    return rgba.rgb * maxRange * rgba.a;
}
const mat3 LUVInverse = mat3( 6.0013.2.700.1.7995.1.332.3.1029.5.7720.0.3007.1.088.5.6268 );
vec3 LUVToRGB( const in vec4 vLogLuv ) {
    float Le = vLogLuv.z * 255.0 + vLogLuv.w;
    vec3 Xp_Y_XYZp;
    Xp_Y_XYZp.y = exp2((Le - 127.0) / 2.0);
    Xp_Y_XYZp.z = Xp_Y_XYZp.y / vLogLuv.y;
    Xp_Y_XYZp.x = vLogLuv.x * Xp_Y_XYZp.z;
    vec3 vRGB = LUVInverse * Xp_Y_XYZp;
    return max(vRGB, 0.0);
}
// From Sebastien Lagarde Moving Frostbite to PBR page 69
// We have a better approximation of the off specular peak
// but due to the other approximations we found this one performs better.
// N is the normal direction
// R is the mirror vector
// This approximation works fine for G smith correlated and uncorrelated
vec3 getSpecularDominantDir(const in vec3 N, const in vec3 R, const in float realRoughness) {
    vec3 dominant;
    if ( uSpecularPeak == 1 ) {
        float smoothness = 1.0 - realRoughness;
        float lerpFactor = smoothness * (sqrt(smoothness) + realRoughness);
        // The result is not normalized as we fetch in a cubemap
        
        dominant = mix(N, R, lerpFactor);
    }
    else {
        dominant = R;
    }
    return dominant;
}
float occlusionHorizon( const in vec3 R, const in vec3 normal) {
    if ( uOcclusionHorizon == 0)
    return 1.0;
    
    // http://marmosetco.tumblr.com/post/81245981087
    
    // marmoset uses 1.3, we force it to 1.0
    float factor = clamp( 1.0 + dot(R, normal), 0.0.1.0 );
    return factor * factor;
}
vec3 evaluateDiffuseSphericalHarmonics( const in vec3 N, const in vec3 V ) {
    return sphericalHarmonics( uEnvironmentSphericalHarmonics, environmentTransform * N );
}
#ifdef CUBEMAP_LOD
    
    
    vec3 textureCubeRGBE(const in samplerCube tex, const in vec3 uv) {
        vec4 rgbe = textureCube(tex, uv );
        return RGBEToRGB( rgbe );
    }
    vec3 scaleDirection(const in float scale, const in vec3 dirIn) {
        vec3 dir = dirIn;
        float M = max(max(abs(dir.x), abs(dir.y)), abs(dir.z));
        if (abs(dir.x) ! = M) dir.x *= scale;
        if (abs(dir.y) ! = M) dir.y *= scale;
        if (abs(dir.z) ! = M) dir.z *= scale;
        return dir;
    }
    vec3 textureCubemapLod(const in samplerCube tex, const in vec3 dir, const in float lod ) {
        #ifdef CUBEMAP_LOD
            vec4 rgba = textureCubeLodEXT( tex, dir, lod );
        #else
            vec4 rgba = textureCube( tex, dir );
        #endif
        #ifdef FLOAT
            return rgba.rgb;
        #endif
        #ifdef RGBE
            return RGBEToRGB( rgba );
        #endif
        #ifdef RGBM
            return RGBMToRGB( rgba );
        #endif
        #ifdef LUV
            return LUVToRGB( rgba );
        #endif
    }
    vec3 textureCubemap(const in samplerCube tex, const in vec3 dir ) {
        vec4 rgba = textureCube( tex, dir );
        #ifdef FLOAT
            return rgba.rgb;
        #endif
        #ifdef RGBE
            return RGBEToRGB( rgba );
        #endif
        #ifdef RGBM
            return RGBMToRGB( rgba );
        #endif
        #ifdef LUV
            return LUVToRGB( rgba );
        #else
            return rgba.rgb;
        #endif
    }
    vec3 cubemapSeamlessFixDirection(const in vec3 direction, const in float scale ) {
        vec3 dir = direction;
        // http://seblagarde.wordpress.com/2012/06/10/amd-cubemapgen-for-physically-based-rendering/
        
        float M = max(max(abs(dir.x), abs(dir.y)), abs(dir.z));
        if (abs(dir.x) ! = M) dir.x *= scale;
        if (abs(dir.y) ! = M) dir.y *= scale;
        if (abs(dir.z) ! = M) dir.z *= scale;
        return dir;
    }
    vec3 textureCubeLodEXTFixed(const in samplerCube tex, const in vec3 direction, const in float lodInput ) {
        float lod = min( uEnvironmentLodRange[0], lodInput );
        
        // http://seblagarde.wordpress.com/2012/06/10/amd-cubemapgen-for-physically-based-rendering/
        
        float scale = 1.0 - exp2(lod) / uEnvironmentSize[0];
        vec3 dir = cubemapSeamlessFixDirection( direction, scale);
        return textureCubemapLod( tex, dir, lod ).rgb;
    }
    // seamless cubemap for background ( no lod )
    vec3 textureCubeFixed(const in samplerCube tex, const in vec3 direction ) {
        // http://seblagarde.wordpress.com/2012/06/10/amd-cubemapgen-for-physically-based-rendering/
        float scale = 1.0 - 1.0 / uEnvironmentSize[0];
        vec3 dir = cubemapSeamlessFixDirection( direction, scale);
        return textureCubemap( tex, dir );
    }
#endif


#ifdef PANORAMA
    
    # define PI (3.1415926535897932384626433832795)
    # define PI_2 (2.0 * 3.1415926535897932384626433832795)
    # define INV_PI 1.0 / PI
    # define INV_LOG2 1.4426950408889634073599246810019
    
    
    
    vec2 computeUVForMipmap( const in float level, const in vec2 uv, const in float size, const in float maxLOD ) {
        // width for level
        float widthForLevel = exp2( maxLOD-level);
        
        // the height locally for the level in pixel
        
        // to opimitize a bit we scale down the v by two in the inputs uv
        float heightForLevel = widthForLevel * 0.5;
        #if 0
            float texelSize = 1.0 / size;
            float resizeX = (widthForLevel - 2.0) * texelSize;
            float resizeY = (heightForLevel - 2.0) * texelSize;
            float uvSpaceLocalX = texelSize + uv.x * resizeX;
            float uvSpaceLocalY = texelSize + uv.y * resizeY;
            uvSpaceLocalY += (size - widthForLevel ) / size;
            return vec2( uvSpaceLocalX, uvSpaceLocalY);
        #else
            // compact version
            float texelSize = 1.0/size;
            vec2 uvSpaceLocal = vec2(1.0) + uv * vec2(widthForLevel - 2.0, heightForLevel - 2.0);
            uvSpaceLocal.y += size - widthForLevel;
            return uvSpaceLocal * texelSize;
        #endif
    }
    //for y up
    vec2 normalToPanoramaUVY( const in vec3 dir ) {
        float n = length(dir.xz);
        
        // To avoid bleeding the Max (-1.0, dir.x/n) is needed
        
        vec2 pos = vec2( (n>0.0000001)?max(1.0, dir.x / n) : 0.0, dir.y);
        
        // fix edge bleeding
        
        if ( pos.x > 0.0 ) pos.x = min( 0.999999, pos.x );
        pos = acos(pos)*INV_PI;
        pos.x = (dir.z > 0.0)? pos.x*0.5 : 1.0-(pos.x*0.5);
        
        // shift u to center the panorama to -z
        
        pos.x = mod(pos.x0.25+1.0.1.0 );
        pos.y = 1.0-pos.y;
        return pos;
    }
    // for z up
    vec2 normalToPanoramaUVZ( const in vec3 dir ) {
        float n = length(dir.xy);
        
        // To avoid bleeding the Max (-1.0, dir.x/n) is needed
        
        vec2 pos = vec2( (n>0.0000001)?max(1.0, dir.x / n) : 0.0, dir.z);
        
        // fix edge bleeding
        
        if ( pos.x > 0.0 ) pos.x = min( 0.999999, pos.x );
        pos = acos(pos)*INV_PI;
        
        // to avoid bleeding the limit must be set to 0.4999999 instead of 0.5
        
        pos.x = (dir.y > 0.0)? pos.x*0.5 : 1.0-(pos.x*0.5);
        
        // shift u to center the panorama to -y
        
        pos.x = mod(pos.x0.25+1.0.1.0 );
        pos.y = 1.0-pos.y;
        return pos;
    }
    #define normalToPanoramaUV normalToPanoramaUVY
    
    
    vec3 texturePanorama(const in sampler2D tex, const in vec2 uv) {
        vec4 rgba = texture2D(tex, uv );
        #ifdef FLOAT
            return rgba.rgb;
        #endif
        #ifdef RGBE
            return RGBEToRGB( rgba );
        #endif
        #ifdef RGBM
            return RGBMToRGB( rgba );
        #endif
        #ifdef LUV
            return LUVToRGB( rgba );
        #else
            return rgba.rgb;
        #endif
    }
    vec3 texturePanoramaLod(const in sampler2D tex, const in vec2 size, const in vec3 direction, const in float lodInput, const in float maxLOD ) {
        float lod = min( maxLOD, lodInput );
        vec2 uvBase = normalToPanoramaUV( direction );
        
        // // we scale down v here because it avoid to do twice in sub functions
        
        / / uvBase. * y = 0.5;
        
        float lod0 = floor(lod);
        vec2 uv0 = computeUVForMipmap(lod0, uvBase, size.x, maxLOD );
        vec3 texel0 = texturePanorama( tex, uv0.xy);
        float lod1 = ceil(lod);
        vec2 uv1 = computeUVForMipmap(lod1, uvBase, size.x, maxLOD );
        vec3 texel1 = texturePanorama( tex, uv1.xy);
        return mix(texel0, texel1, fract( lod ) );
    }
    vec3 getTexelPanorama( const in vec3 dir, const in float lod ) {
        vec2 uvBase = normalToPanoramaUV( dir );
        vec3 texel = texturePanoramaLod( uEnvironment, uEnvironmentSize, dir, lod, uEnvironmentLodRange[0]);return texel;
    }
    vec3 getReferenceTexelEnvironment( const in vec3 dirLocal, const in float lod ) {
        vec3 direction = environmentTransform * dirLocal;
        return getTexelPanorama( direction, lod );
    }
#endif


// require:
// uniform int uEnvironmentMaxLod
// samplerCube uEnvironmentCube
// uniform sampler2D uIntegrateBRDF;
// 


// frostbite, lagarde paper p67
// http://www.frostbite.com/wp-content/uploads/2014/11/course_notes_moving_frostbite_to_pbr.pdf
float linRoughnessToMipmap( float roughnessLinear ) {
    //return roughnessLinear;
    return sqrt(roughnessLinear);
}
vec3 prefilterEnvMap( float roughnessLinear, const in vec3 R ) {
    #ifdef CUBEMAP_LOD
        
        float lod = linRoughnessToMipmap(roughnessLinear) * uEnvironmentLodRange[1]; //(uenvironmentMaxlod-1.0);
        
        return textureCubeLodEXTFixed( uEnvironmentCube, R, lod );
    #else
        
        float lod = linRoughnessToMipmap(roughnessLinear) * uEnvironmentLodRange[1];
        vec2 uvBase = normalToPanoramaUV( R );
        vec3 texel = texturePanoramaLod( uEnvironment, uEnvironmentSize, R, lod, uEnvironmentLodRange[0]);return texel;
    #endif
}
vec2 integrateBRDF( float r, float NoV ) {
    vec4 rgba = texture2D( uIntegrateBRDF, vec2(NoV, r ) );
    const float div = 1.0/65535.0;
    float b = (rgba[3] * 65280.0 + rgba[2] * 255.0);
    float a = (rgba[1] * 65280.0 + rgba[0] * 255.0);
    return vec2( a, b ) * div;
}
// https://www.unrealengine.com/blog/physically-based-shading-on-mobile
vec3 integrateBRDFApprox( const in vec3 specular, float roughness, float NoV ) {
    const vec4 c0 = vec4( - 1.0.0275.0.572.0.022 );
    const vec4 c1 = vec4( 1.0.0425.1.04.0.04 );
    vec4 r = roughness * c0 + c1;
    float a004 = min( r.x * r.x, exp2( 9.28 * NoV ) ) * r.x + r.y;
    vec2 AB = vec2( 1.04.1.04 ) * a004 + r.zw;
    return specular * AB.x + AB.y;
}
vec3 approximateSpecularIBL( const in vec3 specularColor, float rLinear, const in vec3 N, const in vec3 V ) {
    float roughnessLinear = max( rLinear, 0.0);
    float NoV = dot( N, V );
    vec3 R = normalize((2.0 * NoV ) * N - V);
    
    
    // From Sebastien Lagarde Moving Frostbite to PBR page 69
    
    // so roughness = linRoughness * linRoughness
    vec3 dominantR = getSpecularDominantDir( N, R, roughnessLinear*roughnessLinear );
    vec3 dir = environmentTransform * dominantR;
    vec3 prefilteredColor = prefilterEnvMap( roughnessLinear, dir );
    
    
    // marmoset tricks
    
    prefilteredColor *= occlusionHorizon( dominantR, vViewNormal );
    #ifdef MOBILE
        return uBrightness * prefilteredColor * integrateBRDFApprox( specularColor, roughnessLinear, NoV );
    #else
        vec2 envBRDF = integrateBRDF( roughnessLinear, NoV );
        return uBrightness * prefilteredColor * ( specularColor * envBRDF.x + envBRDF.y );
    #endif
}
vec3 computeIBL_UE4( const in vec3 normal, const in vec3 view, const in vec3 albedo, const in float roughness, const in vec3 specular, const in float ao) {
    vec3 color = vec3(0.0);
    if ( albedo ! = color ) {
        // skip if no diffuse
        color += uBrightness * albedo * ao * evaluateDiffuseSphericalHarmonics(normal, view );
    }
    color += approximateSpecularIBL(specular, roughness, normal, view);
    return color;
}
mat3 getEnvironmentTransfrom( mat4 transform ) {
    vec3 x = vec3(transform[0] [0], transform[1] [0], transform[2] [0]);
    vec3 y = vec3(transform[0] [1], transform[1] [1], transform[2] [1]);
    vec3 z = vec3(transform[0] [2], transform[1] [2], transform[2] [2]);
    mat3 m = mat3(x, y, z);
    return m;
}
vec3 computeNormalFromTangentSpaceNormalMap(const in vec4 tangent, const in vec3 normal, const in vec3 texnormal) {
    vec3 tang = vec3(0.0.1.0.0.0);
    if (length(tangent.xyz) ! = 0.0) {
        tang = normalize(tangent.xyz);
    }
    vec3 B = tangent.w * cross(normal, tang);
    vec3 outnormal = texnormal.x*tang + texnormal.y*B + texnormal.z*normal;
    return normalize(outnormal);
}
vec3 textureNormal(const in vec3 rgb) {
    vec3 n = normalize((rgb-vec3(0.5)));
    return n;
}
float adjustRoughness( const in float roughness, const in vec3 normal ) {
    // Based on The Order : 1886 SIGGRAPH course notes implementation (page 21 notes)
    float normalLen = length(normal*2.01.0);
    if ( normalLen < 1.0) {
        float normalLen2 = normalLen * normalLen;
        float kappa = ( 3.0 * normalLen -  normalLen2 * normalLen )/( 1.0 - normalLen2 );
        // http://www.frostbite.com/2014/11/moving-frostbite-to-pbr/
        
        // Page 91: use 0.5/kappa instead
        return min(1.0.sqrt( roughness * roughness + 1.0/kappa ));
    }
    return roughness;
}
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Vertex shader

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