@xeokit/xeokit-sdk
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3D BIM IFC Viewer SDK for AEC engineering applications. Open Source JavaScript Toolkit based on pure WebGL for top performance, real-world coordinates and full double precision
1,123 lines (1,042 loc) • 69.1 kB
JavaScript
/**
* @private
*/
import {LinearEncoding, sRGBEncoding} from "../../constants/constants.js";
const DrawShaderSource = function (mesh) {
if (mesh._material._state.type === "LambertMaterial") {
this.vertex = buildVertexLambert(mesh);
this.fragment = buildFragmentLambert(mesh);
} else {
this.vertex = buildVertexDraw(mesh);
this.fragment = buildFragmentDraw(mesh);
}
};
const TEXTURE_DECODE_FUNCS = {};
TEXTURE_DECODE_FUNCS[LinearEncoding] = "linearToLinear";
TEXTURE_DECODE_FUNCS[sRGBEncoding] = "sRGBToLinear";
function getReceivesShadow(mesh) {
if (!mesh.receivesShadow) {
return false;
}
const lights = mesh.scene._lightsState.lights;
if (!lights || lights.length === 0) {
return false;
}
for (let i = 0, len = lights.length; i < len; i++) {
if (lights[i].castsShadow) {
return true;
}
}
return false;
}
function hasTextures(mesh) {
if (!mesh._geometry._state.uvBuf) {
return false;
}
const material = mesh._material;
return !!(material._ambientMap ||
material._occlusionMap ||
material._baseColorMap ||
material._diffuseMap ||
material._alphaMap ||
material._specularMap ||
material._glossinessMap ||
material._specularGlossinessMap ||
material._emissiveMap ||
material._metallicMap ||
material._roughnessMap ||
material._metallicRoughnessMap ||
material._reflectivityMap ||
material._normalMap);
}
function hasNormals(mesh) {
const primitive = mesh._geometry._state.primitiveName;
if ((mesh._geometry._state.autoVertexNormals || mesh._geometry._state.normalsBuf) && (primitive === "triangles" || primitive === "triangle-strip" || primitive === "triangle-fan")) {
return true;
}
return false;
}
function buildVertexLambert(mesh) {
const scene = mesh.scene;
const sectionPlanesState = mesh.scene._sectionPlanesState;
const lightsState = mesh.scene._lightsState;
const geometryState = mesh._geometry._state;
const billboard = mesh._state.billboard;
const stationary = mesh._state.stationary;
const clipping = sectionPlanesState.getNumAllocatedSectionPlanes() > 0;
const quantizedGeometry = !!geometryState.compressGeometry;
const src = [];
src.push("#version 300 es");
src.push("// Lambertian drawing vertex shader");
src.push("in vec3 position;");
src.push("uniform mat4 modelMatrix;");
src.push("uniform mat4 viewMatrix;");
src.push("uniform mat4 projMatrix;");
src.push("uniform vec4 colorize;");
src.push("uniform vec3 offset;");
if (quantizedGeometry) {
src.push("uniform mat4 positionsDecodeMatrix;");
}
if (scene.logarithmicDepthBufferEnabled) {
src.push("uniform float logDepthBufFC;");
src.push("out float vFragDepth;");
src.push("bool isPerspectiveMatrix(mat4 m) {");
src.push(" return (m[2][3] == - 1.0);");
src.push("}");
src.push("out float isPerspective;");
}
if (clipping) {
src.push("out vec4 vWorldPosition;");
}
src.push("uniform vec4 lightAmbient;");
src.push("uniform vec4 materialColor;");
src.push("uniform vec3 materialEmissive;");
if (geometryState.normalsBuf) {
src.push("in vec3 normal;");
src.push("uniform mat4 modelNormalMatrix;");
src.push("uniform mat4 viewNormalMatrix;");
for (let i = 0, len = lightsState.lights.length; i < len; i++) {
const light = lightsState.lights[i];
if (light.type === "ambient") {
continue;
}
src.push("uniform vec4 lightColor" + i + ";");
if (light.type === "dir") {
src.push("uniform vec3 lightDir" + i + ";");
}
if (light.type === "point") {
src.push("uniform vec3 lightPos" + i + ";");
}
if (light.type === "spot") {
src.push("uniform vec3 lightPos" + i + ";");
src.push("uniform vec3 lightDir" + i + ";");
}
}
if (quantizedGeometry) {
src.push("vec3 octDecode(vec2 oct) {");
src.push(" vec3 v = vec3(oct.xy, 1.0 - abs(oct.x) - abs(oct.y));");
src.push(" if (v.z < 0.0) {");
src.push(" v.xy = (1.0 - abs(v.yx)) * vec2(v.x >= 0.0 ? 1.0 : -1.0, v.y >= 0.0 ? 1.0 : -1.0);");
src.push(" }");
src.push(" return normalize(v);");
src.push("}");
}
}
src.push("out vec4 vColor;");
if (geometryState.primitiveName === "points") {
src.push("uniform float pointSize;");
}
if (billboard === "spherical" || billboard === "cylindrical") {
src.push("void billboard(inout mat4 mat) {");
src.push(" mat[0][0] = 1.0;");
src.push(" mat[0][1] = 0.0;");
src.push(" mat[0][2] = 0.0;");
if (billboard === "spherical") {
src.push(" mat[1][0] = 0.0;");
src.push(" mat[1][1] = 1.0;");
src.push(" mat[1][2] = 0.0;");
}
src.push(" mat[2][0] = 0.0;");
src.push(" mat[2][1] = 0.0;");
src.push(" mat[2][2] =1.0;");
src.push("}");
}
src.push("void main(void) {");
src.push("vec4 localPosition = vec4(position, 1.0); ");
src.push("vec4 worldPosition;");
if (quantizedGeometry) {
src.push("localPosition = positionsDecodeMatrix * localPosition;");
}
if (geometryState.normalsBuf) {
if (quantizedGeometry) {
src.push("vec4 localNormal = vec4(octDecode(normal.xy), 0.0); ");
} else {
src.push("vec4 localNormal = vec4(normal, 0.0); ");
}
src.push("mat4 modelNormalMatrix2 = modelNormalMatrix;");
src.push("mat4 viewNormalMatrix2 = viewNormalMatrix;");
}
src.push("mat4 viewMatrix2 = viewMatrix;");
src.push("mat4 modelMatrix2 = modelMatrix;");
if (stationary) {
src.push("viewMatrix2[3][0] = viewMatrix2[3][1] = viewMatrix2[3][2] = 0.0;")
}
if (billboard === "spherical" || billboard === "cylindrical") {
src.push("mat4 modelViewMatrix = viewMatrix2 * modelMatrix2;");
src.push("billboard(modelMatrix2);");
src.push("billboard(viewMatrix2);");
src.push("billboard(modelViewMatrix);");
if (geometryState.normalsBuf) {
src.push("mat4 modelViewNormalMatrix = viewNormalMatrix2 * modelNormalMatrix2;");
src.push("billboard(modelNormalMatrix2);");
src.push("billboard(viewNormalMatrix2);");
src.push("billboard(modelViewNormalMatrix);");
}
src.push("worldPosition = modelMatrix2 * localPosition;");
src.push("worldPosition.xyz = worldPosition.xyz + offset;");
src.push("vec4 viewPosition = modelViewMatrix * localPosition;");
} else {
src.push("worldPosition = modelMatrix2 * localPosition;");
src.push("worldPosition.xyz = worldPosition.xyz + offset;");
src.push("vec4 viewPosition = viewMatrix2 * worldPosition; ");
}
if (geometryState.normalsBuf) {
src.push("vec3 viewNormal = normalize((viewNormalMatrix2 * modelNormalMatrix2 * localNormal).xyz);");
}
src.push("vec3 reflectedColor = vec3(0.0, 0.0, 0.0);");
src.push("vec3 viewLightDir = vec3(0.0, 0.0, -1.0);");
src.push("float lambertian = 1.0;");
if (geometryState.normalsBuf) {
for (let i = 0, len = lightsState.lights.length; i < len; i++) {
const light = lightsState.lights[i];
if (light.type === "ambient") {
continue;
}
if (light.type === "dir") {
if (light.space === "view") {
src.push("viewLightDir = normalize(lightDir" + i + ");");
} else {
src.push("viewLightDir = normalize((viewMatrix2 * vec4(lightDir" + i + ", 0.0)).xyz);");
}
} else if (light.type === "point") {
if (light.space === "view") {
src.push("viewLightDir = -normalize(lightPos" + i + " - viewPosition.xyz);");
} else {
src.push("viewLightDir = -normalize((viewMatrix2 * vec4(lightPos" + i + ", 0.0)).xyz);");
}
} else if (light.type === "spot") {
if (light.space === "view") {
src.push("viewLightDir = normalize(lightDir" + i + ");");
} else {
src.push("viewLightDir = normalize((viewMatrix2 * vec4(lightDir" + i + ", 0.0)).xyz);");
}
} else {
continue;
}
src.push("lambertian = max(dot(-viewNormal, viewLightDir), 0.0);");
src.push("reflectedColor += lambertian * (lightColor" + i + ".rgb * lightColor" + i + ".a);");
}
}
src.push("vColor = vec4((lightAmbient.rgb * lightAmbient.a * materialColor.rgb) + materialEmissive.rgb + (reflectedColor * materialColor.rgb), materialColor.a) * colorize;"); // TODO: How to have ambient bright enough for canvas BG but not too bright for scene?
if (clipping) {
src.push("vWorldPosition = worldPosition;");
}
if (geometryState.primitiveName === "points") {
src.push("gl_PointSize = pointSize;");
}
src.push("vec4 clipPos = projMatrix * viewPosition;");
if (scene.logarithmicDepthBufferEnabled) {
src.push("vFragDepth = 1.0 + clipPos.w;");
src.push("isPerspective = float (isPerspectiveMatrix(projMatrix));");
}
src.push("gl_Position = clipPos;");
src.push("}");
return src;
}
function buildFragmentLambert(mesh) {
const scene = mesh.scene;
const sectionPlanesState = scene._sectionPlanesState;
const materialState = mesh._material._state;
const geometryState = mesh._geometry._state;
const clipping = sectionPlanesState.getNumAllocatedSectionPlanes() > 0;
const solid = false && materialState.backfaces;
const gammaOutput = scene.gammaOutput; // If set, then it expects that all textures and colors need to be outputted in premultiplied gamma. Default is false.
const src = [];
src.push("#version 300 es");
src.push("// Lambertian drawing fragment shader");
src.push("#ifdef GL_FRAGMENT_PRECISION_HIGH");
src.push("precision highp float;");
src.push("precision highp int;");
src.push("#else");
src.push("precision mediump float;");
src.push("precision mediump int;");
src.push("#endif");
if (scene.logarithmicDepthBufferEnabled) {
src.push("in float isPerspective;");
src.push("uniform float logDepthBufFC;");
src.push("in float vFragDepth;");
}
if (clipping) {
src.push("in vec4 vWorldPosition;");
src.push("uniform bool clippable;");
for (let i = 0, len = sectionPlanesState.getNumAllocatedSectionPlanes(); i < len; i++) {
src.push("uniform bool sectionPlaneActive" + i + ";");
src.push("uniform vec3 sectionPlanePos" + i + ";");
src.push("uniform vec3 sectionPlaneDir" + i + ";");
}
}
src.push("in vec4 vColor;");
if (gammaOutput) {
src.push("uniform float gammaFactor;");
src.push(" vec4 linearToGamma( in vec4 value, in float gammaFactor ) {");
src.push(" return vec4( pow( value.xyz, vec3( 1.0 / gammaFactor ) ), value.w );");
src.push("}");
}
src.push("out vec4 outColor;");
src.push("void main(void) {");
if (clipping) {
src.push("if (clippable) {");
src.push(" float dist = 0.0;");
for (let i = 0, len = sectionPlanesState.getNumAllocatedSectionPlanes(); i < len; i++) {
src.push("if (sectionPlaneActive" + i + ") {");
src.push(" dist += clamp(dot(-sectionPlaneDir" + i + ".xyz, vWorldPosition.xyz - sectionPlanePos" + i + ".xyz), 0.0, 1000.0);");
src.push("}");
}
src.push(" if (dist > 0.0) { discard; }");
if (solid) {
src.push(" if (gl_FrontFacing == false) {");
src.push(" outColor = vec4(1.0, 0.0, 0.0, 1.0);");
src.push(" return;");
src.push(" }");
}
src.push("}");
}
if (geometryState.primitiveName === "points") {
src.push("vec2 cxy = 2.0 * gl_PointCoord - 1.0;");
src.push("float r = dot(cxy, cxy);");
src.push("if (r > 1.0) {");
src.push(" discard;");
src.push("}");
}
if (scene.logarithmicDepthBufferEnabled) {
src.push("gl_FragDepth = isPerspective == 0.0 ? gl_FragCoord.z : log2( vFragDepth ) * logDepthBufFC * 0.5;");
}
if (gammaOutput) {
src.push("outColor = linearToGamma(vColor, gammaFactor);");
} else {
src.push("outColor = vColor;");
}
src.push("}");
return src;
}
function buildVertexDraw(mesh) {
const scene = mesh.scene;
const material = mesh._material;
const meshState = mesh._state;
const sectionPlanesState = scene._sectionPlanesState;
const geometryState = mesh._geometry._state;
const lightsState = scene._lightsState;
let i;
let len;
let light;
const billboard = meshState.billboard;
const background = meshState.background;
const stationary = meshState.stationary;
const texturing = hasTextures(mesh);
const normals = hasNormals(mesh);
const clipping = sectionPlanesState.getNumAllocatedSectionPlanes() > 0;
const receivesShadow = getReceivesShadow(mesh);
const quantizedGeometry = !!geometryState.compressGeometry;
const src = [];
src.push("#version 300 es");
src.push("// Drawing vertex shader");
src.push("in vec3 position;");
if (quantizedGeometry) {
src.push("uniform mat4 positionsDecodeMatrix;");
}
src.push("uniform mat4 modelMatrix;");
src.push("uniform mat4 viewMatrix;");
src.push("uniform mat4 projMatrix;");
src.push("out vec3 vViewPosition;");
src.push("uniform vec3 offset;");
if (clipping) {
src.push("out vec4 vWorldPosition;");
}
if (scene.logarithmicDepthBufferEnabled) {
src.push("uniform float logDepthBufFC;");
src.push("out float vFragDepth;");
src.push("bool isPerspectiveMatrix(mat4 m) {");
src.push(" return (m[2][3] == - 1.0);");
src.push("}");
src.push("out float isPerspective;");
}
if (lightsState.lightMaps.length > 0) {
src.push("out vec3 vWorldNormal;");
}
if (normals) {
src.push("in vec3 normal;");
src.push("uniform mat4 modelNormalMatrix;");
src.push("uniform mat4 viewNormalMatrix;");
src.push("out vec3 vViewNormal;");
for (let i = 0, len = lightsState.lights.length; i < len; i++) {
light = lightsState.lights[i];
if (light.type === "ambient") {
continue;
}
if (light.type === "dir") {
src.push("uniform vec3 lightDir" + i + ";");
}
if (light.type === "point") {
src.push("uniform vec3 lightPos" + i + ";");
}
if (light.type === "spot") {
src.push("uniform vec3 lightPos" + i + ";");
src.push("uniform vec3 lightDir" + i + ";");
}
if (!(light.type === "dir" && light.space === "view")) {
src.push("out vec4 vViewLightReverseDirAndDist" + i + ";");
}
}
if (quantizedGeometry) {
src.push("vec3 octDecode(vec2 oct) {");
src.push(" vec3 v = vec3(oct.xy, 1.0 - abs(oct.x) - abs(oct.y));");
src.push(" if (v.z < 0.0) {");
src.push(" v.xy = (1.0 - abs(v.yx)) * vec2(v.x >= 0.0 ? 1.0 : -1.0, v.y >= 0.0 ? 1.0 : -1.0);");
src.push(" }");
src.push(" return normalize(v);");
src.push("}");
}
}
if (texturing) {
src.push("in vec2 uv;");
src.push("out vec2 vUV;");
if (quantizedGeometry) {
src.push("uniform mat3 uvDecodeMatrix;")
}
}
if (geometryState.colors) {
src.push("in vec4 color;");
src.push("out vec4 vColor;");
}
if (geometryState.primitiveName === "points") {
src.push("uniform float pointSize;");
}
if (billboard === "spherical" || billboard === "cylindrical") {
src.push("void billboard(inout mat4 mat) {");
src.push(" mat[0][0] = 1.0;");
src.push(" mat[0][1] = 0.0;");
src.push(" mat[0][2] = 0.0;");
if (billboard === "spherical") {
src.push(" mat[1][0] = 0.0;");
src.push(" mat[1][1] = 1.0;");
src.push(" mat[1][2] = 0.0;");
}
src.push(" mat[2][0] = 0.0;");
src.push(" mat[2][1] = 0.0;");
src.push(" mat[2][2] =1.0;");
src.push("}");
}
if (receivesShadow) {
src.push("const mat4 texUnitConverter = mat4(0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.5, 0.5, 0.5, 1.0);");
for (let i = 0, len = lightsState.lights.length; i < len; i++) { // Light sources
if (lightsState.lights[i].castsShadow) {
src.push("uniform mat4 shadowViewMatrix" + i + ";");
src.push("uniform mat4 shadowProjMatrix" + i + ";");
src.push("out vec4 vShadowPosFromLight" + i + ";");
}
}
}
src.push("void main(void) {");
src.push("vec4 localPosition = vec4(position, 1.0); ");
src.push("vec4 worldPosition;");
if (quantizedGeometry) {
src.push("localPosition = positionsDecodeMatrix * localPosition;");
}
if (normals) {
if (quantizedGeometry) {
src.push("vec4 localNormal = vec4(octDecode(normal.xy), 0.0); ");
} else {
src.push("vec4 localNormal = vec4(normal, 0.0); ");
}
src.push("mat4 modelNormalMatrix2 = modelNormalMatrix;");
src.push("mat4 viewNormalMatrix2 = viewNormalMatrix;");
}
src.push("mat4 viewMatrix2 = viewMatrix;");
src.push("mat4 modelMatrix2 = modelMatrix;");
if (stationary) {
src.push("viewMatrix2[3][0] = viewMatrix2[3][1] = viewMatrix2[3][2] = 0.0;")
} else if (background) {
src.push("viewMatrix2[3] = vec4(0.0, 0.0, 0.0 ,1.0);");
}
if (billboard === "spherical" || billboard === "cylindrical") {
src.push("mat4 modelViewMatrix = viewMatrix2 * modelMatrix2;");
src.push("billboard(modelMatrix2);");
src.push("billboard(viewMatrix2);");
src.push("billboard(modelViewMatrix);");
if (normals) {
src.push("mat4 modelViewNormalMatrix = viewNormalMatrix2 * modelNormalMatrix2;");
src.push("billboard(modelNormalMatrix2);");
src.push("billboard(viewNormalMatrix2);");
src.push("billboard(modelViewNormalMatrix);");
}
src.push("worldPosition = modelMatrix2 * localPosition;");
src.push("worldPosition.xyz = worldPosition.xyz + offset;");
src.push("vec4 viewPosition = modelViewMatrix * localPosition;");
} else {
src.push("worldPosition = modelMatrix2 * localPosition;");
src.push("worldPosition.xyz = worldPosition.xyz + offset;");
src.push("vec4 viewPosition = viewMatrix2 * worldPosition; ");
}
if (normals) {
src.push("vec3 worldNormal = (modelNormalMatrix2 * localNormal).xyz; ");
if (lightsState.lightMaps.length > 0) {
src.push("vWorldNormal = worldNormal;");
}
src.push("vViewNormal = normalize((viewNormalMatrix2 * vec4(worldNormal, 1.0)).xyz);");
src.push("vec3 tmpVec3;");
src.push("float lightDist;");
for (let i = 0, len = lightsState.lights.length; i < len; i++) { // Lights
light = lightsState.lights[i];
if (light.type === "ambient") {
continue;
}
if (light.type === "dir") {
if (light.space === "world") {
src.push("tmpVec3 = vec3(viewMatrix2 * vec4(lightDir" + i + ", 0.0) ).xyz;");
src.push("vViewLightReverseDirAndDist" + i + " = vec4(-tmpVec3, 0.0);");
}
}
if (light.type === "point") {
if (light.space === "world") {
src.push("tmpVec3 = (viewMatrix2 * vec4(lightPos" + i + ", 1.0)).xyz - viewPosition.xyz;");
src.push("lightDist = abs(length(tmpVec3));");
} else {
src.push("tmpVec3 = lightPos" + i + ".xyz - viewPosition.xyz;");
src.push("lightDist = abs(length(tmpVec3));");
}
src.push("vViewLightReverseDirAndDist" + i + " = vec4(tmpVec3, lightDist);");
}
}
}
if (texturing) {
if (quantizedGeometry) {
src.push("vUV = (uvDecodeMatrix * vec3(uv, 1.0)).xy;");
} else {
src.push("vUV = uv;");
}
}
if (geometryState.colors) {
src.push("vColor = color;");
}
if (geometryState.primitiveName === "points") {
src.push("gl_PointSize = pointSize;");
}
if (clipping) {
src.push("vWorldPosition = worldPosition;");
}
src.push(" vViewPosition = viewPosition.xyz;");
src.push("vec4 clipPos = projMatrix * viewPosition;");
if (scene.logarithmicDepthBufferEnabled) {
src.push("vFragDepth = 1.0 + clipPos.w;");
src.push("isPerspective = float (isPerspectiveMatrix(projMatrix));");
}
if (background) {
src.push("clipPos.z = clipPos.w;");
}
src.push("gl_Position = clipPos;");
if (receivesShadow) {
src.push("const mat4 texUnitConverter = mat4(0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.5, 0.5, 0.5, 1.0);");
src.push("vec4 tempx; ");
for (let i = 0, len = lightsState.lights.length; i < len; i++) { // Light sources
if (lightsState.lights[i].castsShadow) {
src.push("vShadowPosFromLight" + i + " = texUnitConverter * shadowProjMatrix" + i + " * (shadowViewMatrix" + i + " * worldPosition); ");
}
}
}
src.push("}");
return src;
}
function buildFragmentDraw(mesh) {
const scene = mesh.scene;
const gl = scene.canvas.gl;
const material = mesh._material;
const geometryState = mesh._geometry._state;
const sectionPlanesState = mesh.scene._sectionPlanesState;
const lightsState = mesh.scene._lightsState;
const materialState = mesh._material._state;
const clipping = sectionPlanesState.getNumAllocatedSectionPlanes() > 0;
const normals = hasNormals(mesh);
const uvs = geometryState.uvBuf;
const solid = false && materialState.backfaces;
const phongMaterial = (materialState.type === "PhongMaterial");
const metallicMaterial = (materialState.type === "MetallicMaterial");
const specularMaterial = (materialState.type === "SpecularMaterial");
const receivesShadow = getReceivesShadow(mesh);
const gammaInput = scene.gammaInput; // If set, then it expects that all textures and colors are premultiplied gamma. Default is false.
const gammaOutput = scene.gammaOutput; // If set, then it expects that all textures and colors need to be outputted in premultiplied gamma. Default is false.
let light;
const src = [];
src.push("#version 300 es");
src.push("// Drawing fragment shader");
src.push("#ifdef GL_FRAGMENT_PRECISION_HIGH");
src.push("precision highp float;");
src.push("precision highp int;");
src.push("#else");
src.push("precision mediump float;");
src.push("precision mediump int;");
src.push("#endif");
if (scene.logarithmicDepthBufferEnabled) {
src.push("in float isPerspective;");
src.push("uniform float logDepthBufFC;");
src.push("in float vFragDepth;");
}
if (receivesShadow) {
src.push("float unpackDepth (vec4 color) {");
src.push(" const vec4 bitShift = vec4(1.0, 1.0/256.0, 1.0/(256.0 * 256.0), 1.0/(256.0*256.0*256.0));");
src.push(" return dot(color, bitShift);");
src.push("}");
}
//--------------------------------------------------------------------------------
// GAMMA CORRECTION
//--------------------------------------------------------------------------------
src.push("uniform float gammaFactor;");
src.push("vec4 linearToLinear( in vec4 value ) {");
src.push(" return value;");
src.push("}");
src.push("vec4 sRGBToLinear( in vec4 value ) {");
src.push(" return vec4( mix( pow( value.rgb * 0.9478672986 + vec3( 0.0521327014 ), vec3( 2.4 ) ), value.rgb * 0.0773993808, vec3( lessThanEqual( value.rgb, vec3( 0.04045 ) ) ) ), value.w );");
src.push("}");
src.push("vec4 gammaToLinear( in vec4 value) {");
src.push(" return vec4( pow( value.xyz, vec3( gammaFactor ) ), value.w );");
src.push("}");
if (gammaOutput) {
src.push("vec4 linearToGamma( in vec4 value, in float gammaFactor ) {");
src.push(" return vec4( pow( value.xyz, vec3( 1.0 / gammaFactor ) ), value.w );");
src.push("}");
}
//--------------------------------------------------------------------------------
// USER CLIP PLANES
//--------------------------------------------------------------------------------
if (clipping) {
src.push("in vec4 vWorldPosition;");
src.push("uniform bool clippable;");
for (var i = 0; i < sectionPlanesState.getNumAllocatedSectionPlanes(); i++) {
src.push("uniform bool sectionPlaneActive" + i + ";");
src.push("uniform vec3 sectionPlanePos" + i + ";");
src.push("uniform vec3 sectionPlaneDir" + i + ";");
}
}
if (normals) {
//--------------------------------------------------------------------------------
// LIGHT AND REFLECTION MAP INPUTS
// Define here so available globally to shader functions
//--------------------------------------------------------------------------------
if (lightsState.lightMaps.length > 0) {
src.push("uniform samplerCube lightMap;");
src.push("uniform mat4 viewNormalMatrix;");
}
if (lightsState.reflectionMaps.length > 0) {
src.push("uniform samplerCube reflectionMap;");
}
if (lightsState.lightMaps.length > 0 || lightsState.reflectionMaps.length > 0) {
src.push("uniform mat4 viewMatrix;");
}
//--------------------------------------------------------------------------------
// SHADING FUNCTIONS
//--------------------------------------------------------------------------------
// CONSTANT DEFINITIONS
src.push("#define PI 3.14159265359");
src.push("#define RECIPROCAL_PI 0.31830988618");
src.push("#define RECIPROCAL_PI2 0.15915494");
src.push("#define EPSILON 1e-6");
src.push("#define saturate(a) clamp( a, 0.0, 1.0 )");
// UTILITY DEFINITIONS
src.push("vec3 inverseTransformDirection(in vec3 dir, in mat4 matrix) {");
src.push(" return normalize( ( vec4( dir, 0.0 ) * matrix ).xyz );");
src.push("}");
// STRUCTURES
src.push("struct IncidentLight {");
src.push(" vec3 color;");
src.push(" vec3 direction;");
src.push("};");
src.push("struct ReflectedLight {");
src.push(" vec3 diffuse;");
src.push(" vec3 specular;");
src.push("};");
src.push("struct Geometry {");
src.push(" vec3 position;");
src.push(" vec3 viewNormal;");
src.push(" vec3 worldNormal;");
src.push(" vec3 viewEyeDir;");
src.push("};");
src.push("struct Material {");
src.push(" vec3 diffuseColor;");
src.push(" float specularRoughness;");
src.push(" vec3 specularColor;");
src.push(" float shine;"); // Only used for Phong
src.push("};");
// COMMON UTILS
if (phongMaterial) {
if (lightsState.lightMaps.length > 0 || lightsState.reflectionMaps.length > 0) {
src.push("void computePhongLightMapping(const in Geometry geometry, const in Material material, inout ReflectedLight reflectedLight) {");
if (lightsState.lightMaps.length > 0) {
src.push(" vec3 irradiance = " + TEXTURE_DECODE_FUNCS[lightsState.lightMaps[0].encoding] + "(texture(lightMap, geometry.worldNormal)).rgb;");
src.push(" irradiance *= PI;");
src.push(" vec3 diffuseBRDFContrib = (RECIPROCAL_PI * material.diffuseColor);");
src.push(" reflectedLight.diffuse += irradiance * diffuseBRDFContrib;");
}
if (lightsState.reflectionMaps.length > 0) {
src.push(" vec3 reflectVec = reflect(-geometry.viewEyeDir, geometry.viewNormal);");
src.push(" vec3 radiance = texture(reflectionMap, reflectVec).rgb * 0.2;");
src.push(" radiance *= PI;");
src.push(" reflectedLight.specular += radiance;");
}
src.push("}");
}
src.push("void computePhongLighting(const in IncidentLight directLight, const in Geometry geometry, const in Material material, inout ReflectedLight reflectedLight) {");
src.push(" float dotNL = saturate(dot(geometry.viewNormal, directLight.direction));");
src.push(" vec3 irradiance = dotNL * directLight.color * PI;");
src.push(" reflectedLight.diffuse += irradiance * (RECIPROCAL_PI * material.diffuseColor);");
src.push(" reflectedLight.specular += directLight.color * material.specularColor * pow(max(dot(reflect(-directLight.direction, -geometry.viewNormal), geometry.viewEyeDir), 0.0), material.shine);");
src.push("}");
}
if (metallicMaterial || specularMaterial) {
// IRRADIANCE EVALUATION
src.push("float GGXRoughnessToBlinnExponent(const in float ggxRoughness) {");
src.push(" float r = ggxRoughness + 0.0001;");
src.push(" return (2.0 / (r * r) - 2.0);");
src.push("}");
src.push("float getSpecularMIPLevel(const in float blinnShininessExponent, const in int maxMIPLevel) {");
src.push(" float maxMIPLevelScalar = float( maxMIPLevel );");
src.push(" float desiredMIPLevel = maxMIPLevelScalar - 0.79248 - 0.5 * log2( ( blinnShininessExponent * blinnShininessExponent ) + 1.0 );");
src.push(" return clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );");
src.push("}");
if (lightsState.reflectionMaps.length > 0) {
src.push("vec3 getLightProbeIndirectRadiance(const in vec3 reflectVec, const in float blinnShininessExponent, const in int maxMIPLevel) {");
src.push(" float mipLevel = 0.5 * getSpecularMIPLevel(blinnShininessExponent, maxMIPLevel);"); //TODO: a random factor - fix this
src.push(" vec3 envMapColor = " + TEXTURE_DECODE_FUNCS[lightsState.reflectionMaps[0].encoding] + "(texture(reflectionMap, reflectVec, mipLevel)).rgb;");
src.push(" return envMapColor;");
src.push("}");
}
// SPECULAR BRDF EVALUATION
src.push("vec3 F_Schlick(const in vec3 specularColor, const in float dotLH) {");
src.push(" float fresnel = exp2( ( -5.55473 * dotLH - 6.98316 ) * dotLH );");
src.push(" return ( 1.0 - specularColor ) * fresnel + specularColor;");
src.push("}");
src.push("float G_GGX_Smith(const in float alpha, const in float dotNL, const in float dotNV) {");
src.push(" float a2 = ( alpha * alpha );");
src.push(" float gl = dotNL + sqrt( a2 + ( 1.0 - a2 ) * ( dotNL * dotNL ) );");
src.push(" float gv = dotNV + sqrt( a2 + ( 1.0 - a2 ) * ( dotNV * dotNV ) );");
src.push(" return 1.0 / ( gl * gv );");
src.push("}");
src.push("float G_GGX_SmithCorrelated(const in float alpha, const in float dotNL, const in float dotNV) {");
src.push(" float a2 = ( alpha * alpha );");
src.push(" float gv = dotNL * sqrt( a2 + ( 1.0 - a2 ) * ( dotNV * dotNV ) );");
src.push(" float gl = dotNV * sqrt( a2 + ( 1.0 - a2 ) * ( dotNL * dotNL ) );");
src.push(" return 0.5 / max( gv + gl, EPSILON );");
src.push("}");
src.push("float D_GGX(const in float alpha, const in float dotNH) {");
src.push(" float a2 = ( alpha * alpha );");
src.push(" float denom = ( dotNH * dotNH) * ( a2 - 1.0 ) + 1.0;");
src.push(" return RECIPROCAL_PI * a2 / ( denom * denom);");
src.push("}");
src.push("vec3 BRDF_Specular_GGX(const in IncidentLight incidentLight, const in Geometry geometry, const in vec3 specularColor, const in float roughness) {");
src.push(" float alpha = ( roughness * roughness );");
src.push(" vec3 halfDir = normalize( incidentLight.direction + geometry.viewEyeDir );");
src.push(" float dotNL = saturate( dot( geometry.viewNormal, incidentLight.direction ) );");
src.push(" float dotNV = saturate( dot( geometry.viewNormal, geometry.viewEyeDir ) );");
src.push(" float dotNH = saturate( dot( geometry.viewNormal, halfDir ) );");
src.push(" float dotLH = saturate( dot( incidentLight.direction, halfDir ) );");
src.push(" vec3 F = F_Schlick( specularColor, dotLH );");
src.push(" float G = G_GGX_SmithCorrelated( alpha, dotNL, dotNV );");
src.push(" float D = D_GGX( alpha, dotNH );");
src.push(" return F * (G * D);");
src.push("}");
src.push("vec3 BRDF_Specular_GGX_Environment(const in Geometry geometry, const in vec3 specularColor, const in float roughness) {");
src.push(" float dotNV = saturate(dot(geometry.viewNormal, geometry.viewEyeDir));");
src.push(" const vec4 c0 = vec4( -1, -0.0275, -0.572, 0.022);");
src.push(" const vec4 c1 = vec4( 1, 0.0425, 1.04, -0.04);");
src.push(" vec4 r = roughness * c0 + c1;");
src.push(" float a004 = min(r.x * r.x, exp2(-9.28 * dotNV)) * r.x + r.y;");
src.push(" vec2 AB = vec2(-1.04, 1.04) * a004 + r.zw;");
src.push(" return specularColor * AB.x + AB.y;");
src.push("}");
if (lightsState.lightMaps.length > 0 || lightsState.reflectionMaps.length > 0) {
src.push("void computePBRLightMapping(const in Geometry geometry, const in Material material, inout ReflectedLight reflectedLight) {");
if (lightsState.lightMaps.length > 0) {
src.push(" vec3 irradiance = sRGBToLinear(texture(lightMap, geometry.worldNormal)).rgb;");
src.push(" irradiance *= PI;");
src.push(" vec3 diffuseBRDFContrib = (RECIPROCAL_PI * material.diffuseColor);");
src.push(" reflectedLight.diffuse += irradiance * diffuseBRDFContrib;");
// src.push(" reflectedLight.diffuse = vec3(1.0, 0.0, 0.0);");
}
if (lightsState.reflectionMaps.length > 0) {
src.push(" vec3 reflectVec = reflect(-geometry.viewEyeDir, geometry.viewNormal);");
src.push(" reflectVec = inverseTransformDirection(reflectVec, viewMatrix);");
src.push(" float blinnExpFromRoughness = GGXRoughnessToBlinnExponent(material.specularRoughness);");
src.push(" vec3 radiance = getLightProbeIndirectRadiance(reflectVec, blinnExpFromRoughness, 8);");
src.push(" vec3 specularBRDFContrib = BRDF_Specular_GGX_Environment(geometry, material.specularColor, material.specularRoughness);");
src.push(" reflectedLight.specular += radiance * specularBRDFContrib;");
}
src.push("}");
}
// MAIN LIGHTING COMPUTATION FUNCTION
src.push("void computePBRLighting(const in IncidentLight incidentLight, const in Geometry geometry, const in Material material, inout ReflectedLight reflectedLight) {");
src.push(" float dotNL = saturate(dot(geometry.viewNormal, incidentLight.direction));");
src.push(" vec3 irradiance = dotNL * incidentLight.color * PI;");
src.push(" reflectedLight.diffuse += irradiance * (RECIPROCAL_PI * material.diffuseColor);");
src.push(" reflectedLight.specular += irradiance * BRDF_Specular_GGX(incidentLight, geometry, material.specularColor, material.specularRoughness);");
src.push("}");
} // (metallicMaterial || specularMaterial)
} // geometry.normals
//--------------------------------------------------------------------------------
// GEOMETRY INPUTS
//--------------------------------------------------------------------------------
src.push("in vec3 vViewPosition;");
if (geometryState.colors) {
src.push("in vec4 vColor;");
}
if (uvs &&
((normals && material._normalMap)
|| material._ambientMap
|| material._baseColorMap
|| material._diffuseMap
|| material._emissiveMap
|| material._metallicMap
|| material._roughnessMap
|| material._metallicRoughnessMap
|| material._specularMap
|| material._glossinessMap
|| material._specularGlossinessMap
|| material._occlusionMap
|| material._alphaMap)) {
src.push("in vec2 vUV;");
}
if (normals) {
if (lightsState.lightMaps.length > 0) {
src.push("in vec3 vWorldNormal;");
}
src.push("in vec3 vViewNormal;");
}
//--------------------------------------------------------------------------------
// MATERIAL CHANNEL INPUTS
//--------------------------------------------------------------------------------
if (materialState.ambient) {
src.push("uniform vec3 materialAmbient;");
}
if (materialState.baseColor) {
src.push("uniform vec3 materialBaseColor;");
}
if (materialState.alpha !== undefined && materialState.alpha !== null) {
src.push("uniform vec4 materialAlphaModeCutoff;"); // [alpha, alphaMode, alphaCutoff]
}
if (materialState.emissive) {
src.push("uniform vec3 materialEmissive;");
}
if (materialState.diffuse) {
src.push("uniform vec3 materialDiffuse;");
}
if (materialState.glossiness !== undefined && materialState.glossiness !== null) {
src.push("uniform float materialGlossiness;");
}
if (materialState.shininess !== undefined && materialState.shininess !== null) {
src.push("uniform float materialShininess;"); // Phong channel
}
if (materialState.specular) {
src.push("uniform vec3 materialSpecular;");
}
if (materialState.metallic !== undefined && materialState.metallic !== null) {
src.push("uniform float materialMetallic;");
}
if (materialState.roughness !== undefined && materialState.roughness !== null) {
src.push("uniform float materialRoughness;");
}
if (materialState.specularF0 !== undefined && materialState.specularF0 !== null) {
src.push("uniform float materialSpecularF0;");
}
//--------------------------------------------------------------------------------
// MATERIAL TEXTURE INPUTS
//--------------------------------------------------------------------------------
if (uvs && material._ambientMap) {
src.push("uniform sampler2D ambientMap;");
if (material._ambientMap._state.matrix) {
src.push("uniform mat4 ambientMapMatrix;");
}
}
if (uvs && material._baseColorMap) {
src.push("uniform sampler2D baseColorMap;");
if (material._baseColorMap._state.matrix) {
src.push("uniform mat4 baseColorMapMatrix;");
}
}
if (uvs && material._diffuseMap) {
src.push("uniform sampler2D diffuseMap;");
if (material._diffuseMap._state.matrix) {
src.push("uniform mat4 diffuseMapMatrix;");
}
}
if (uvs && material._emissiveMap) {
src.push("uniform sampler2D emissiveMap;");
if (material._emissiveMap._state.matrix) {
src.push("uniform mat4 emissiveMapMatrix;");
}
}
if (normals && uvs && material._metallicMap) {
src.push("uniform sampler2D metallicMap;");
if (material._metallicMap._state.matrix) {
src.push("uniform mat4 metallicMapMatrix;");
}
}
if (normals && uvs && material._roughnessMap) {
src.push("uniform sampler2D roughnessMap;");
if (material._roughnessMap._state.matrix) {
src.push("uniform mat4 roughnessMapMatrix;");
}
}
if (normals && uvs && material._metallicRoughnessMap) {
src.push("uniform sampler2D metallicRoughnessMap;");
if (material._metallicRoughnessMap._state.matrix) {
src.push("uniform mat4 metallicRoughnessMapMatrix;");
}
}
if (normals && material._normalMap) {
src.push("uniform sampler2D normalMap;");
if (material._normalMap._state.matrix) {
src.push("uniform mat4 normalMapMatrix;");
}
src.push("vec3 perturbNormal2Arb( vec3 eye_pos, vec3 surf_norm, vec2 uv ) {");
src.push(" vec3 q0 = vec3( dFdx( eye_pos.x ), dFdx( eye_pos.y ), dFdx( eye_pos.z ) );");
src.push(" vec3 q1 = vec3( dFdy( eye_pos.x ), dFdy( eye_pos.y ), dFdy( eye_pos.z ) );");
src.push(" vec2 st0 = dFdx( uv.st );");
src.push(" vec2 st1 = dFdy( uv.st );");
src.push(" vec3 S = normalize( q0 * st1.t - q1 * st0.t );");
src.push(" vec3 T = normalize( -q0 * st1.s + q1 * st0.s );");
src.push(" vec3 N = normalize( surf_norm );");
src.push(" vec3 mapN = texture( normalMap, uv ).xyz * 2.0 - 1.0;");
src.push(" mat3 tsn = mat3( S, T, N );");
// src.push(" mapN *= 3.0;");
src.push(" return normalize( tsn * mapN );");
src.push("}");
}
if (uvs && material._occlusionMap) {
src.push("uniform sampler2D occlusionMap;");
if (material._occlusionMap._state.matrix) {
src.push("uniform mat4 occlusionMapMatrix;");
}
}
if (uvs && material._alphaMap) {
src.push("uniform sampler2D alphaMap;");
if (material._alphaMap._state.matrix) {
src.push("uniform mat4 alphaMapMatrix;");
}
}
if (normals && uvs && material._specularMap) {
src.push("uniform sampler2D specularMap;");
if (material._specularMap._state.matrix) {
src.push("uniform mat4 specularMapMatrix;");
}
}
if (normals && uvs && material._glossinessMap) {
src.push("uniform sampler2D glossinessMap;");
if (material._glossinessMap._state.matrix) {
src.push("uniform mat4 glossinessMapMatrix;");
}
}
if (normals && uvs && material._specularGlossinessMap) {
src.push("uniform sampler2D materialSpecularGlossinessMap;");
if (material._specularGlossinessMap._state.matrix) {
src.push("uniform mat4 materialSpecularGlossinessMapMatrix;");
}
}
//--------------------------------------------------------------------------------
// MATERIAL FRESNEL INPUTS
//--------------------------------------------------------------------------------
if (normals && (material._diffuseFresnel ||
material._specularFresnel ||
material._alphaFresnel ||
material._emissiveFresnel ||
material._reflectivityFresnel)) {
src.push("float fresnel(vec3 eyeDir, vec3 normal, float edgeBias, float centerBias, float power) {");
src.push(" float fr = abs(dot(eyeDir, normal));");
src.push(" float finalFr = clamp((fr - edgeBias) / (centerBias - edgeBias), 0.0, 1.0);");
src.push(" return pow(finalFr, power);");
src.push("}");
if (material._diffuseFresnel) {
src.push("uniform float diffuseFresnelCenterBias;");
src.push("uniform float diffuseFresnelEdgeBias;");
src.push("uniform float diffuseFresnelPower;");
src.push("uniform vec3 diffuseFresnelCenterColor;");
src.push("uniform vec3 diffuseFresnelEdgeColor;");
}
if (material._specularFresnel) {
src.push("uniform float specularFresnelCenterBias;");
src.push("uniform float specularFresnelEdgeBias;");
src.push("uniform float specularFresnelPower;");
src.push("uniform vec3 specularFresnelCenterColor;");
src.push("uniform vec3 specularFresnelEdgeColor;");
}
if (material._alphaFresnel) {
src.push("uniform float alphaFresnelCenterBias;");
src.push("uniform float alphaFresnelEdgeBias;");
src.push("uniform float alphaFresnelPower;");
src.push("uniform vec3 alphaFresnelCenterColor;");
src.push("uniform vec3 alphaFresnelEdgeColor;");
}
if (material._reflectivityFresnel) {
src.push("uniform float materialSpecularF0FresnelCenterBias;");
src.push("uniform float materialSpecularF0FresnelEdgeBias;");
src.push("uniform float materialSpecularF0FresnelPower;");
src.push("uniform vec3 materialSpecularF0FresnelCenterColor;");
src.push("uniform vec3 materialSpecularF0FresnelEdgeColor;");
}
if (material._emissiveFresnel) {
src.push("uniform float emissiveFresnelCenterBias;");
src.push("uniform float emissiveFresnelEdgeBias;");
src.push("uniform float emissiveFresnelPower;");
src.push("uniform vec3 emissiveFresnelCenterColor;");
src.push("uniform vec3 emissiveFresnelEdgeColor;");
}
}
//--------------------------------------------------------------------------------
// LIGHT SOURCES
//--------------------------------------------------------------------------------
src.push("uniform vec4 lightAmbient;");
if (normals) {
for (let i = 0, len = lightsState.lights.length; i < len; i++) { // Light sources
const light = lightsState.lights[i];
if (light.type === "ambient") {
continue;
}
src.push("uniform vec4 lightColor" + i + ";");
if (light.type === "point") {
src.push("uniform vec3 lightAttenuation" + i + ";");
}
if (light.type === "dir" && light.space === "view") {
src.push("uniform vec3 lightDir" + i + ";");
}
if (light.type === "point" && light.space === "view") {
src.push("uniform vec3 lightPos" + i + ";");
} else {
src.push("in vec4 vViewLightReverseDirAndDist" + i + ";");
}
}
}
if (receivesShadow) {
// Variance castsShadow mapping filter
// src.push("float linstep(float low, float high, float v){");
// src.push(" return clamp((v-low)/(high-low), 0.0, 1.0);");
// src.push("}");
//
// src.push("float VSM(sampler2D depths, vec2 uv, float compare){");
// src.push(" vec2 moments = texture(depths, uv).xy;");
// src.push(" float p = smoothstep(compare-0.02, compare, moments.x);");
// src.push(" float variance = max(moments.y - moments.x*moments.x, -0.001);");
// src.push(" float d = compare - moments.x;");
// src.push(" float p_max = linstep(0.2, 1.0, variance / (variance + d*d));");
// src.push(" return clamp(max(p, p_max), 0.0, 1.0);");
// src.push("}");
for (let i = 0, len = lightsState.lights.length; i < len; i++) { // Light sources
if (lightsState.lights[i].castsShadow) {
src.push("in vec4 vShadowPosFromLight" + i + ";");
src.push("uniform sampler2D shadowMap" + i + ";");
}
}
}
src.push("uniform vec4 colorize;");
//================================================================================
// MAIN
//================================================================================
src.push("out vec4 outColor;");
src.push("void main(void) {");
if (clipping) {
src.push("if (clippable) {");
src.push(" float dist = 0.0;");
for (var i = 0; i < sectionPlanesState.getNumAllocatedSectionPlanes(); i++) {
src.push("if (sectionPlaneActive" + i + ") {");
src.push(" dist += clamp(dot(-sectionPlaneDir" + i + ".xyz, vWorldPosition.xyz - sectionPlanePos" + i + ".xyz), 0.0, 1000.0);");
src.push("}");
}
src.push(" if (dist > 0.0) { discard; }");
if (solid) {
src.push(" if (gl_FrontFacing == false) {");
src.push(" outColor = vec4(1