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photonstormphotonstorm
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Added all of the shader chunks
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‎src/layer3d/shaders/chunks/alphaTestFrag.js‎

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module.exports = [
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'#ifdef ALPHATEST',
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'',
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' if ( outColor.a < ALPHATEST ) {',
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' discard;',
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' } else {',
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' // Prevent alpha test edge gradient',
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' outColor.a = u_Opacity;',
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' }',
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'',
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'#endif'
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].join('\n');

‎src/layer3d/shaders/chunks/alphamapFrag.js‎

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module.exports = [
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'#ifdef USE_ALPHA_MAP',
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'',
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' #ifdef USE_ALPHA_MAP_UV_TRANSFORM',
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' outColor.a *= texture2D(alphaMap, vAlphaMapUV).g;',
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' #else',
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' #if (USE_ALPHA_MAP == 1)',
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' outColor.a *= texture2D(alphaMap, v_Uv).g;',
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' #elif (USE_ALPHA_MAP == 2)',
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' outColor.a *= texture2D(alphaMap, v_Uv2).g;',
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' #else',
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' outColor.a *= texture2D(alphaMap, v_Uv).g;',
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' #endif',
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' #endif',
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'',
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'#endif'
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].join('\n');

‎src/layer3d/shaders/chunks/alphamapParsFrag.js‎

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module.exports = [
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'#ifdef USE_ALPHA_MAP',
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'',
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' uniform sampler2D alphaMap;',
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'',
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'#endif'
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].join('\n');

‎src/layer3d/shaders/chunks/ambientlightParsFrag.js‎

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module.exports = [
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'uniform vec3 u_AmbientLightColor;'
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].join('\n');

‎src/layer3d/shaders/chunks/aoMapParsFrag.js‎

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module.exports = [
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'#ifdef USE_AOMAP',
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'',
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' uniform sampler2D aoMap;',
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' uniform float aoMapIntensity;',
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'',
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'#endif'
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].join('\n');

‎src/layer3d/shaders/chunks/beginFrag.js‎

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module.exports = [
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'vec4 outColor = vec4(u_Color, u_Opacity);'
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].join('\n');

‎src/layer3d/shaders/chunks/beginVert.js‎

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module.exports = [
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'vec3 transformed = vec3(a_Position);',
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'vec3 objectNormal = vec3(a_Normal);',
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'#ifdef USE_TANGENT',
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' vec3 objectTangent = vec3(a_Tangent.xyz);',
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'#endif'
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].join('\n');

‎src/layer3d/shaders/chunks/bsdfs.js‎

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module.exports = [
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'// diffuse just use lambert',
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'',
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'vec4 BRDF_Diffuse_Lambert(vec4 diffuseColor) {',
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' return RECIPROCAL_PI * diffuseColor;',
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'}',
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'',
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'// specular use Cook-Torrance microfacet model, http://ruh.li/GraphicsCookTorrance.html',
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'// About RECIPROCAL_PI: referenced by http://www.joshbarczak.com/blog/?p=272',
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'',
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'vec4 F_Schlick( const in vec4 specularColor, const in float dotLH ) {',
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' // Original approximation by Christophe Schlick '94',
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' float fresnel = pow( 1.0 - dotLH, 5.0 );',
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'',
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' // Optimized variant (presented by Epic at SIGGRAPH '13)',
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' // float fresnel = exp2( ( -5.55473 * dotLH - 6.98316 ) * dotLH );',
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'',
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' return ( 1.0 - specularColor ) * fresnel + specularColor;',
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'}',
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'',
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'// use blinn phong instead of phong',
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'float D_BlinnPhong( const in float shininess, const in float dotNH ) {',
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' // ( shininess * 0.5 + 1.0 ), three.js do this, but why ???',
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' return RECIPROCAL_PI * ( shininess * 0.5 + 1.0 ) * pow( dotNH, shininess );',
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'}',
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'',
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'float G_BlinnPhong_Implicit( /* const in float dotNL, const in float dotNV */ ) {',
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' // geometry term is (n dot l)(n dot v) / 4(n dot l)(n dot v)',
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' return 0.25;',
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'}',
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'',
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'vec4 BRDF_Specular_BlinnPhong(vec4 specularColor, vec3 N, vec3 L, vec3 V, float shininess) {',
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' vec3 H = normalize(L + V);',
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'',
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' float dotNH = saturate(dot(N, H));',
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' float dotLH = saturate(dot(L, H));',
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'',
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' vec4 F = F_Schlick(specularColor, dotLH);',
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'',
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' float G = G_BlinnPhong_Implicit( /* dotNL, dotNV */ );',
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'',
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' float D = D_BlinnPhong(shininess, dotNH);',
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'',
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' return F * G * D;',
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'}',
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'',
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'// Microfacet Models for Refraction through Rough Surfaces - equation (33)',
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'// http://graphicrants.blogspot.com/2013/08/specular-brdf-reference.html',
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'// alpha is "roughness squared" in Disney’s reparameterization',
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'float D_GGX( const in float alpha, const in float dotNH ) {',
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'',
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' float a2 = pow2( alpha );',
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'',
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' float denom = pow2( dotNH ) * ( a2 - 1.0 ) + 1.0; // avoid alpha = 0 with dotNH = 1',
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'',
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' return RECIPROCAL_PI * a2 / pow2( denom );',
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'',
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'}',
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'',
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'// Microfacet Models for Refraction through Rough Surfaces - equation (34)',
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'// http://graphicrants.blogspot.com/2013/08/specular-brdf-reference.html',
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'// alpha is "roughness squared" in Disney’s reparameterization',
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'float G_GGX_Smith( const in float alpha, const in float dotNL, const in float dotNV ) {',
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'',
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' // geometry term = G(l)⋅G(v) / 4(n⋅l)(n⋅v)',
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'',
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' float a2 = pow2( alpha );',
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'',
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' float gl = dotNL + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );',
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' float gv = dotNV + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );',
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'',
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' return 1.0 / ( gl * gv );',
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'',
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'}',
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'',
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'// Moving Frostbite to Physically Based Rendering 2.0 - page 12, listing 2',
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'// http://www.frostbite.com/wp-content/uploads/2014/11/course_notes_moving_frostbite_to_pbr_v2.pdf',
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'float G_GGX_SmithCorrelated( const in float alpha, const in float dotNL, const in float dotNV ) {',
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'',
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' float a2 = pow2( alpha );',
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'',
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' // dotNL and dotNV are explicitly swapped. This is not a mistake.',
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' float gv = dotNL * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );',
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' float gl = dotNV * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );',
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'',
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' return 0.5 / max( gv + gl, EPSILON );',
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'}',
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'',
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'// GGX Distribution, Schlick Fresnel, GGX-Smith Visibility',
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'vec4 BRDF_Specular_GGX(vec4 specularColor, vec3 N, vec3 L, vec3 V, float roughness) {',
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'',
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' float alpha = pow2( roughness ); // UE4's roughness',
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'',
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' vec3 H = normalize(L + V);',
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'',
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' float dotNL = saturate( dot(N, L) );',
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' float dotNV = saturate( dot(N, V) );',
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' float dotNH = saturate( dot(N, H) );',
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' float dotLH = saturate( dot(L, H) );',
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'',
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' vec4 F = F_Schlick( specularColor, dotLH );',
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'',
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' float G = G_GGX_SmithCorrelated( alpha, dotNL, dotNV );',
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'',
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' float D = D_GGX( alpha, dotNH );',
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'',
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' return F * G * D;',
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'',
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'}',
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'',
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'// ref: https://www.unrealengine.com/blog/physically-based-shading-on-mobile - environmentBRDF for GGX on mobile',
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'vec4 BRDF_Specular_GGX_Environment( const in vec3 N, const in vec3 V, const in vec4 specularColor, const in float roughness ) {',
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'',
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' float dotNV = saturate( dot( N, V ) );',
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'',
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' const vec4 c0 = vec4( - 1, - 0.0275, - 0.572, 0.022 );',
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'',
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' const vec4 c1 = vec4( 1, 0.0425, 1.04, - 0.04 );',
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'',
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' vec4 r = roughness * c0 + c1;',
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'',
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' float a004 = min( r.x * r.x, exp2( - 9.28 * dotNV ) ) * r.x + r.y;',
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'',
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' vec2 AB = vec2( -1.04, 1.04 ) * a004 + r.zw;',
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'',
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' return specularColor * AB.x + AB.y;',
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'',
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'}',
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'',
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'// source: http://simonstechblog.blogspot.ca/2011/12/microfacet-brdf.html',
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'float GGXRoughnessToBlinnExponent( const in float ggxRoughness ) {',
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' return ( 2.0 / pow2( ggxRoughness + 0.0001 ) - 2.0 );',
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'}',
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'',
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'float BlinnExponentToGGXRoughness( const in float blinnExponent ) {',
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' return sqrt( 2.0 / ( blinnExponent + 2.0 ) );',
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'}'
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].join('\n');

‎src/layer3d/shaders/chunks/bumpMapParsFrag.js‎

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module.exports = [
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'#ifdef USE_BUMPMAP',
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'',
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' uniform sampler2D bumpMap;',
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' uniform float bumpScale;',
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'',
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' // Derivative maps - bump mapping unparametrized surfaces by Morten Mikkelsen',
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' // http://mmikkelsen3d.blogspot.sk/2011/07/derivative-maps.html',
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'',
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' // Evaluate the derivative of the height w.r.t. screen-space using forward differencing (listing 2)',
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'',
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' vec2 dHdxy_fwd(vec2 uv) {',
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'',
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' vec2 dSTdx = dFdx( uv );',
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' vec2 dSTdy = dFdy( uv );',
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'',
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' float Hll = bumpScale * texture2D( bumpMap, uv ).x;',
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' float dBx = bumpScale * texture2D( bumpMap, uv + dSTdx ).x - Hll;',
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' float dBy = bumpScale * texture2D( bumpMap, uv + dSTdy ).x - Hll;',
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'',
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' return vec2( dBx, dBy );',
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'',
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' }',
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'',
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' vec3 perturbNormalArb( vec3 surf_pos, vec3 surf_norm, vec2 dHdxy) {',
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'',
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' vec3 vSigmaX = vec3( dFdx( surf_pos.x ), dFdx( surf_pos.y ), dFdx( surf_pos.z ) );',
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' vec3 vSigmaY = vec3( dFdy( surf_pos.x ), dFdy( surf_pos.y ), dFdy( surf_pos.z ) );',
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' vec3 vN = surf_norm; // normalized',
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'',
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' vec3 R1 = cross( vSigmaY, vN );',
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' vec3 R2 = cross( vN, vSigmaX );',
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'',
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' float fDet = dot( vSigmaX, R1 );',
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'',
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' fDet *= ( float( gl_FrontFacing ) * 2.0 - 1.0 );',
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'',
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' vec3 vGrad = sign( fDet ) * ( dHdxy.x * R1 + dHdxy.y * R2 );',
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' return normalize( abs( fDet ) * surf_norm - vGrad );',
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'',
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' }',
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'',
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'#endif',
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''
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].join('\n');

‎src/layer3d/shaders/chunks/clippingPlanesFrag.js‎

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module.exports = [
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'#if NUM_CLIPPING_PLANES > 0',
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'',
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' vec4 plane;',
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'',
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' #pragma unroll_loop',
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' for ( int i = 0; i < NUM_CLIPPING_PLANES; i ++ ) {',
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'',
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' plane = clippingPlanes[ i ];',
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' if ( dot( -v_modelPos, plane.xyz ) > plane.w ) discard;',
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'',
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' }',
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'',
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'#endif'
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].join('\n');

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