@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
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JavaScript
/**
* @author xeolabs / https://github.com/xeolabs
*/
import {PickMeshShaderSource} from "./PickMeshShaderSource.js";
import {Program} from "../../webgl/Program.js";
import {stats} from "../../stats.js";
import {math} from "../../math/math.js";
import {getPlaneRTCPos} from "../../math/rtcCoords.js";
const tempVec3a = math.vec3();
// No ID, because there is exactly one PickMeshRenderer per scene
/**
* @private
*/
const PickMeshRenderer = function (hash, mesh) {
this._hash = hash;
this._shaderSource = new PickMeshShaderSource(mesh);
this._scene = mesh.scene;
this._useCount = 0;
this._allocate(mesh);
};
const renderers = {};
PickMeshRenderer.get = function (mesh) {
const hash = [
mesh.scene.canvas.canvas.id,
mesh.scene._sectionPlanesState.getHash(),
mesh._geometry._state.hash,
mesh._state.hash
].join(";");
let renderer = renderers[hash];
if (!renderer) {
renderer = new PickMeshRenderer(hash, mesh);
if (renderer.errors) {
console.log(renderer.errors.join("\n"));
return null;
}
renderers[hash] = renderer;
stats.memory.programs++;
}
renderer._useCount++;
return renderer;
};
PickMeshRenderer.prototype.put = function () {
if (--this._useCount === 0) {
if (this._program) {
this._program.destroy();
}
delete renderers[this._hash];
stats.memory.programs--;
}
};
PickMeshRenderer.prototype.webglContextRestored = function () {
this._program = null;
};
PickMeshRenderer.prototype.drawMesh = function (frameCtx, mesh) {
if (!this._program) {
this._allocate(mesh);
}
const scene = this._scene;
const gl = scene.canvas.gl;
const meshState = mesh._state;
const materialState = mesh._material._state;
const geometryState = mesh._geometry._state;
const origin = mesh.origin;
if (frameCtx.lastProgramId !== this._program.id) {
frameCtx.lastProgramId = this._program.id;
this._bindProgram(frameCtx);
}
gl.uniformMatrix4fv(this._uViewMatrix, false, origin ? frameCtx.getRTCPickViewMatrix(meshState.originHash, origin) : frameCtx.pickViewMatrix);
if (meshState.clippable) {
const numAllocatedSectionPlanes = scene._sectionPlanesState.getNumAllocatedSectionPlanes();
const numSectionPlanes = scene._sectionPlanesState.sectionPlanes.length;
if (numAllocatedSectionPlanes > 0) {
const sectionPlanes = scene._sectionPlanesState.sectionPlanes;
const renderFlags = mesh.renderFlags;
for (let sectionPlaneIndex = 0; sectionPlaneIndex < numAllocatedSectionPlanes; sectionPlaneIndex++) {
const sectionPlaneUniforms = this._uSectionPlanes[sectionPlaneIndex];
if (sectionPlaneUniforms) {
if (sectionPlaneIndex < numSectionPlanes) {
const active = renderFlags.sectionPlanesActivePerLayer[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);
gl.uniform3fv(sectionPlaneUniforms.pos, rtcSectionPlanePos);
} else {
gl.uniform3fv(sectionPlaneUniforms.pos, sectionPlane.pos);
}
gl.uniform3fv(sectionPlaneUniforms.dir, sectionPlane.dir);
}
} else {
gl.uniform1i(sectionPlaneUniforms.active, 0);
}
}
}
}
}
if (materialState.id !== this._lastMaterialId) {
const backfaces = materialState.backfaces;
if (frameCtx.backfaces !== backfaces) {
if (backfaces) {
gl.disable(gl.CULL_FACE);
} else {
gl.enable(gl.CULL_FACE);
}
frameCtx.backfaces = backfaces;
}
const frontface = materialState.frontface;
if (frameCtx.frontface !== frontface) {
if (frontface) {
gl.frontFace(gl.CCW);
} else {
gl.frontFace(gl.CW);
}
frameCtx.frontface = frontface;
}
this._lastMaterialId = materialState.id;
}
gl.uniformMatrix4fv(this._uProjMatrix, false, frameCtx.pickProjMatrix);
gl.uniformMatrix4fv(this._uModelMatrix, false, mesh.worldMatrix);
if (this._uClippable) {
gl.uniform1i(this._uClippable, mesh._state.clippable);
}
gl.uniform3fv(this._uOffset, mesh._state.offset);
if (geometryState.id !== this._lastGeometryId) {
if (this._uPositionsDecodeMatrix) {
gl.uniformMatrix4fv(this._uPositionsDecodeMatrix, false, geometryState.positionsDecodeMatrix);
}
if (this._aPosition) {
this._aPosition.bindArrayBuffer(geometryState.positionsBuf, geometryState.compressGeometry ? gl.UNSIGNED_SHORT : gl.FLOAT);
frameCtx.bindArray++;
}
if (geometryState.indicesBuf) {
geometryState.indicesBuf.bind();
frameCtx.bindArray++;
}
this._lastGeometryId = geometryState.id;
}
// Mesh-indexed color
var pickID = mesh._state.pickID;
const a = pickID >> 24 & 0xFF;
const b = pickID >> 16 & 0xFF;
const g = pickID >> 8 & 0xFF;
const r = pickID & 0xFF;
gl.uniform4f(this._uPickColor, r / 255, g / 255, b / 255, a / 255);
gl.uniform2fv(this._uPickClipPos, frameCtx.pickClipPos);
if (geometryState.indicesBuf) {
gl.drawElements(geometryState.primitive, geometryState.indicesBuf.numItems, geometryState.indicesBuf.itemType, 0);
frameCtx.drawElements++;
} else if (geometryState.positions) {
gl.drawArrays(gl.TRIANGLES, 0, geometryState.positions.numItems);
}
};
PickMeshRenderer.prototype._allocate = function (mesh) {
const scene = mesh.scene;
const gl = scene.canvas.gl;
this._program = new Program(gl, this._shaderSource);
if (this._program.errors) {
this.errors = this._program.errors;
return;
}
const program = this._program;
this._uPositionsDecodeMatrix = program.getLocation("positionsDecodeMatrix");
this._uModelMatrix = program.getLocation("modelMatrix");
this._uViewMatrix = program.getLocation("viewMatrix");
this._uProjMatrix = program.getLocation("projMatrix");
this._uSectionPlanes = [];
const clips = scene._sectionPlanesState.sectionPlanes;
for (let i = 0, len = clips.length; 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._uClippable = program.getLocation("clippable");
this._uPickColor = program.getLocation("pickColor");
this._uPickClipPos = program.getLocation("pickClipPos");
this._uOffset = program.getLocation("offset");
if (scene.logarithmicDepthBufferEnabled ) {
this._uLogDepthBufFC = program.getLocation("logDepthBufFC");
}
this._lastMaterialId = null;
this._lastGeometryId = null;
};
PickMeshRenderer.prototype._bindProgram = function (frameCtx) {
const scene = this._scene;
const gl = scene.canvas.gl;
const project = scene.camera.project;
this._program.bind();
frameCtx.useProgram++;
if (scene.logarithmicDepthBufferEnabled ) {
const logDepthBufFC = 2.0 / (Math.log(project.far + 1.0) / Math.LN2);
gl.uniform1f(this._uLogDepthBufFC, logDepthBufFC);
}
this._lastMaterialId = null;
this._lastGeometryId = null;
};
export {PickMeshRenderer};