xeokit-viewer
Version:
BIM viewer built on xeokit and Bootstrap
86 lines (82 loc) • 3 kB
JavaScript
/**
* @author xeolabs / https://github.com/xeolabs
*/
/**
* @private
*/
class PickTriangleShaderSource {
constructor(mesh) {
this.vertex = buildVertex(mesh);
this.fragment = buildFragment(mesh);
}
}
function buildVertex(mesh) {
const scene = mesh.scene;
const clipping = scene._sectionPlanesState.sectionPlanes.length > 0;
const quantizedGeometry = !!mesh._geometry._state.compressGeometry;
const billboard = mesh._state.billboard;
const stationary = mesh._state.stationary;
const src = [];
src.push("// Surface picking vertex shader");
src.push("attribute vec3 position;");
src.push("attribute vec4 color;");
src.push("uniform mat4 modelMatrix;");
src.push("uniform mat4 viewMatrix;");
src.push("uniform mat4 projMatrix;");
if (clipping) {
src.push("uniform bool clippable;");
src.push("varying vec4 vWorldPosition;");
}
src.push("varying vec4 vColor;");
if (quantizedGeometry) {
src.push("uniform mat4 positionsDecodeMatrix;");
}
src.push("void main(void) {");
src.push("vec4 localPosition = vec4(position, 1.0); ");
if (quantizedGeometry) {
src.push("localPosition = positionsDecodeMatrix * localPosition;");
}
src.push(" vec4 worldPosition = modelMatrix * localPosition; ");
src.push(" vec4 viewPosition = viewMatrix * worldPosition;");
if (clipping) {
src.push(" vWorldPosition = worldPosition;");
}
src.push(" vColor = color;");
src.push(" gl_Position = projMatrix * viewPosition;");
src.push("}");
return src;
}
function buildFragment(mesh) {
const scene = mesh.scene;
const sectionPlanesState = scene._sectionPlanesState;
const clipping = sectionPlanesState.sectionPlanes.length > 0;
const src = [];
src.push("// Surface picking fragment shader");
src.push("precision lowp float;");
src.push("varying vec4 vColor;");
if (clipping) {
src.push("uniform bool clippable;");
src.push("varying vec4 vWorldPosition;");
for (var i = 0; i < sectionPlanesState.sectionPlanes.length; i++) {
src.push("uniform bool sectionPlaneActive" + i + ";");
src.push("uniform vec3 sectionPlanePos" + i + ";");
src.push("uniform vec3 sectionPlaneDir" + i + ";");
}
}
src.push("void main(void) {");
if (clipping) {
src.push("if (clippable) {");
src.push(" float dist = 0.0;");
for (var i = 0; i < sectionPlanesState.sectionPlanes.length; 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("}");
}
src.push(" gl_FragColor = vColor;");
src.push("}");
return src;
}
export {PickTriangleShaderSource};