@vrame/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
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JavaScript
import {Program} from "../../../../webgl/Program.js";
import {createRTCViewMat, getPlaneRTCPos} from "../../../../math/rtcCoords.js";
import {math} from "../../../../math/math.js";
import {WEBGL_INFO} from "../../../../webglInfo.js";
const tempVec3a = math.vec3();
const tempVec3b = math.vec3();
const tempVec3c = math.vec3();
const tempVec3d = math.vec3();
const tempMat4a = math.mat4();
/**
* @private
*/
export class DTXTrianglesNormalsRenderer {
constructor(scene) {
this._scene = scene;
this._hash = this._getHash();
this._allocate();
}
getValid() {
return this._hash === this._getHash();
};
_getHash() {
return this._scene._sectionPlanesState.getHash();
}
drawLayer(frameCtx, dataTextureLayer, renderPass) {
const model = dataTextureLayer.model;
const scene = model.scene;
const camera = scene.camera;
const gl = scene.canvas.gl;
const state = dataTextureLayer._state;
const origin = dataTextureLayer._state.origin;
const {position, rotationMatrix} = model;
const viewMatrix = camera.viewMatrix;
if (!this._program) {
this._allocate(dataTextureLayer);
if (this.errors) {
return;
}
}
if (frameCtx.lastProgramId !== this._program.id) {
frameCtx.lastProgramId = this._program.id;
this._bindProgram(dataTextureLayer);
}
let rtcViewMatrix;
let rtcCameraEye;
const gotOrigin = (origin[0] !== 0 || origin[1] !== 0 || origin[2] !== 0);
const gotPosition = (position[0] !== 0 || position[1] !== 0 || position[2] !== 0);
if (gotOrigin || gotPosition) {
const rtcOrigin = tempVec3a;
if (gotOrigin) {
const rotatedOrigin = tempVec3b;
math.transformPoint3(rotationMatrix, origin, rotatedOrigin);
rtcOrigin[0] = rotatedOrigin[0];
rtcOrigin[1] = rotatedOrigin[1];
rtcOrigin[2] = rotatedOrigin[2];
} else {
rtcOrigin[0] = 0;
rtcOrigin[1] = 0;
rtcOrigin[2] = 0;
}
rtcOrigin[0] += position[0];
rtcOrigin[1] += position[1];
rtcOrigin[2] += position[2];
rtcViewMatrix = createRTCViewMat(viewMatrix, rtcOrigin, tempMat4a);
rtcCameraEye = tempVec3c;
rtcCameraEye[0] = camera.eye[0] - rtcOrigin[0];
rtcCameraEye[1] = camera.eye[1] - rtcOrigin[1];
rtcCameraEye[2] = camera.eye[2] - rtcOrigin[2];
} else {
rtcViewMatrix = viewMatrix;
rtcCameraEye = camera.eye;
}
gl.uniform1i(this._uRenderPass, renderPass);
gl.uniformMatrix4fv(this._uWorldMatrix, false, rotationMatrix);
gl.uniformMatrix4fv(this._uViewMatrix, false, rtcViewMatrix);
gl.uniformMatrix4fv(this._uProjMatrix, false, camera.projMatrix);
gl.uniformMatrix4fv(this._uViewNormalMatrix, false, camera.viewNormalMatrix);
gl.uniformMatrix4fv(this._uWorldNormalMatrix, false, model.worldNormalMatrix);
const numAllocatedSectionPlanes = scene._sectionPlanesState.getNumAllocatedSectionPlanes();
const numSectionPlanes = scene._sectionPlanesState.sectionPlanes.length;
if (numAllocatedSectionPlanes > 0) {
const sectionPlanes = scene._sectionPlanesState.sectionPlanes;
const baseIndex = dataTextureLayer.layerIndex * numSectionPlanes;
const renderFlags = model.renderFlags;
for (let sectionPlaneIndex = 0; sectionPlaneIndex < numAllocatedSectionPlanes; sectionPlaneIndex++) {
const sectionPlaneUniforms = this._uSectionPlanes[sectionPlaneIndex];
if (sectionPlaneUniforms) {
if (sectionPlaneIndex < numSectionPlanes) {
const active = renderFlags.sectionPlanesActivePerLayer[baseIndex + sectionPlaneIndex];
gl.uniform1i(sectionPlaneUniforms.active, active ? 1 : 0);
if (active) {
const sectionPlane = sectionPlanes[sectionPlaneIndex];
if (origin) {
const rtcSectionPlanePos = getPlaneRTCPos(sectionPlane.dist, sectionPlane.dir, origin, tempVec3a, model.matrix);
gl.uniform3fv(sectionPlaneUniforms.pos, rtcSectionPlanePos);
} else {
gl.uniform3fv(sectionPlaneUniforms.pos, sectionPlane.pos);
}
gl.uniform3fv(sectionPlaneUniforms.dir, sectionPlane.dir);
}
} else {
gl.uniform1i(sectionPlaneUniforms.active, 0);
}
}
}
}
gl.uniformMatrix4fv(this._uPositionsDecodeMatrix, false, dataTextureLayer._state.objectDecodeAndInstanceMatrix);
this._aPosition.bindArrayBuffer(state.positionsBuf);
this._aOffset.bindArrayBuffer(state.offsetsBuf);
this._aNormal.bindArrayBuffer(state.normalsBuf);
this._aColor.bindArrayBuffer(state.colorsBuf);// Needed for masking out transparent entities using alpha channel
this._aFlags.bindArrayBuffer(state.flagsBuf);
if (this._aFlags2) {
this._aFlags2.bindArrayBuffer(state.flags2Buf);
}
state.indicesBuf.bind();
gl.drawElements(gl.TRIANGLES, state.indicesBuf.numItems, state.indicesBuf.itemType, 0);
}
_allocate() {
const scene = this._scene;
const gl = scene.canvas.gl;
this._program = new Program(gl, this._buildShader());
if (this._program.errors) {
this.errors = this._program.errors;
return;
}
const program = this._program;
this._uRenderPass = program.getLocation("renderPass");
this._uPositionsDecodeMatrix = program.getLocation("objectDecodeAndInstanceMatrix");
this._uWorldMatrix = program.getLocation("worldMatrix");
this._uWorldNormalMatrix = program.getLocation("worldNormalMatrix");
this._uViewMatrix = program.getLocation("viewMatrix");
this._uViewNormalMatrix = program.getLocation("viewNormalMatrix");
this._uProjMatrix = program.getLocation("projMatrix");
this._uSectionPlanes = [];
for (let i = 0, len = scene._sectionPlanesState.getNumAllocatedSectionPlanes(); i < len; i++) {
this._uSectionPlanes.push({
active: program.getLocation("sectionPlaneActive" + i),
pos: program.getLocation("sectionPlanePos" + i),
dir: program.getLocation("sectionPlaneDir" + i)
});
}
this._aPosition = program.getAttribute("position");
this._aOffset = program.getAttribute("offset");
this._aNormal = program.getAttribute("normal");
this._aColor = program.getAttribute("color");
this._aFlags = program.getAttribute("flags");
if (this._aFlags2) { // Won't be in shader when not clipping
this._aFlags2 = program.getAttribute("flags2");
}
if ( scene.logarithmicDepthBufferEnabled) {
this._uLogDepthBufFC = program.getLocation("logDepthBufFC");
}
}
_bindProgram() {
const scene = this._scene;
const gl = scene.canvas.gl;
const project = scene.camera.project;
this._program.bind();
gl.uniformMatrix4fv(this._uProjMatrix, false, project.matrix);
if ( scene.logarithmicDepthBufferEnabled) {
const logDepthBufFC = 2.0 / (Math.log(project.far + 1.0) / Math.LN2);
gl.uniform1f(this._uLogDepthBufFC, logDepthBufFC);
}
}
_buildShader() {
return {
vertex: this._buildVertexShader(),
fragment: this._buildFragmentShader()
};
}
_buildVertexShader() {
const scene = this._scene;
const clipping = scene._sectionPlanesState.getNumAllocatedSectionPlanes() > 0;
const src = [];
src.push("// Batched geometry normals vertex shader");
if (scene.logarithmicDepthBufferEnabled && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
src.push("#extension GL_EXT_frag_depth : enable");
}
src.push("uniform int renderPass;");
src.push("attribute vec3 position;");
if (scene.entityOffsetsEnabled) {
src.push("attribute vec3 offset;");
}
src.push("attribute vec3 normal;");
src.push("attribute vec4 color;");
src.push("attribute vec4 flags;");
src.push("attribute vec4 flags2;");
src.push("uniform mat4 worldMatrix;");
src.push("uniform mat4 worldNormalMatrix;");
src.push("uniform mat4 viewMatrix;");
src.push("uniform mat4 projMatrix;");
src.push("uniform mat4 viewNormalMatrix;");
src.push("uniform mat4 objectDecodeAndInstanceMatrix;");
if (scene.logarithmicDepthBufferEnabled) {
src.push("uniform float logDepthBufFC;");
if (WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
src.push("out float vFragDepth;");
}
src.push("bool isPerspectiveMatrix(mat4 m) {");
src.push(" return (m[2][3] == - 1.0);");
src.push("}");
src.push("varying float isPerspective;");
}
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 (clipping) {
src.push("out vec4 vWorldPosition;");
src.push("out vec4 vFlags2;");
}
src.push("out vec3 vViewNormal;");
src.push("void main(void) {");
// flags.x = NOT_RENDERED | COLOR_OPAQUE | COLOR_TRANSPARENT
// renderPass = COLOR_OPAQUE
src.push(`if (int(flags.x) != renderPass) {`);
src.push(" gl_Position = vec4(0.0, 0.0, 0.0, 0.0);");
src.push(" } else {");
src.push(" vec4 worldPosition = worldMatrix * (objectDecodeAndInstanceMatrix * vec4(position, 1.0)); ");
if (scene.entityOffsetsEnabled) {
src.push(" worldPosition.xyz = worldPosition.xyz + offset;");
}
src.push(" vec4 viewPosition = viewMatrix * worldPosition; ");
src.push(" vec4 worldNormal = worldNormalMatrix * vec4(octDecode(normal.xy), 0.0); ");
src.push(" vec3 viewNormal = normalize((viewNormalMatrix * worldNormal).xyz);");
if (clipping) {
src.push(" vWorldPosition = worldPosition;");
src.push(" vFlags2 = flags2;");
}
src.push(" vViewNormal = viewNormal;");
src.push("vec4 clipPos = projMatrix * viewPosition;");
if (scene.logarithmicDepthBufferEnabled) {
if (WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
src.push("vFragDepth = 1.0 + clipPos.w;");
} else {
src.push("clipPos.z = log2( max( 1e-6, clipPos.w + 1.0 ) ) * logDepthBufFC - 1.0;");
src.push("clipPos.z *= clipPos.w;");
}
src.push("isPerspective = float (isPerspectiveMatrix(projMatrix));");
}
src.push("gl_Position = clipPos;");
src.push(" }");
src.push("}");
return src;
}
_buildFragmentShader() {
const scene = this._scene;
const clipping = (scene._sectionPlanesState.getNumAllocatedSectionPlanes() > 0);
const src = [];
src.push("#version 300 es");
src.push("// Batched geometry normals fragment shader");
if (scene.logarithmicDepthBufferEnabled && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
src.push("#extension GL_EXT_frag_depth : enable");
}
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 && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
src.push("in float isPerspective;");
src.push("uniform float logDepthBufFC;");
src.push("in float vFragDepth;");
}
if (clipping) {
src.push("in vec4 vWorldPosition;");
src.push("in vec4 vFlags2;");
for (let i = 0; i < scene._sectionPlanesState.getNumAllocatedSectionPlanes(); i++) {
src.push("uniform bool sectionPlaneActive" + i + ";");
src.push("uniform vec3 sectionPlanePos" + i + ";");
src.push("uniform vec3 sectionPlaneDir" + i + ";");
}
}
src.push("in vec3 vViewNormal;");
src.push("vec3 packNormalToRGB( const in vec3 normal ) {");
src.push(" return normalize( normal ) * 0.5 + 0.5;");
src.push("}");
src.push("void main(void) {");
if (clipping) {
src.push(" bool clippable = (float(vFlags2.x) > 0.0);");
src.push(" if (clippable) {");
src.push(" float dist = 0.0;");
for (var i = 0; i < scene._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; }");
src.push(" }");
}
if (scene.logarithmicDepthBufferEnabled && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
src.push(" gl_FragDepthEXT = isPerspective == 0.0 ? gl_FragCoord.z : log2( vFragDepth ) * logDepthBufFC * 0.5;");
}
src.push(" gl_FragColor = vec4(packNormalToRGB(vViewNormal), 1.0); ");
src.push("}");
return src;
}
webglContextRestored() {
this._program = null;
}
destroy() {
if (this._program) {
this._program.destroy();
}
this._program = null;
}
}