xeokit-viewer
Version:
BIM viewer built on xeokit and Bootstrap
108 lines (104 loc) • 3.91 kB
JavaScript
/**
* @author xeolabs / https://github.com/xeolabs
*/
/**
* @private
*/
class PickMeshShaderSource {
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("// Mesh picking vertex shader");
src.push("attribute vec3 position;");
src.push("uniform mat4 modelMatrix;");
src.push("uniform mat4 viewMatrix;");
src.push("uniform mat4 projMatrix;");
src.push("varying vec4 vViewPosition;");
if (quantizedGeometry) {
src.push("uniform mat4 positionsDecodeMatrix;");
}
if (clipping) {
src.push("varying vec4 vWorldPosition;");
}
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); ");
if (quantizedGeometry) {
src.push("localPosition = positionsDecodeMatrix * localPosition;");
}
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(" vec4 worldPosition = modelMatrix2 * localPosition;");
src.push(" vec4 viewPosition = viewMatrix2 * worldPosition;");
if (clipping) {
src.push(" vWorldPosition = worldPosition;");
}
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("// Mesh picking fragment shader");
src.push("precision lowp float;");
src.push("uniform vec4 pickColor;");
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 = pickColor; ");
src.push("}");
return src;
}
export {PickMeshShaderSource};