xeokit-viewer
Version:
BIM viewer built on xeokit and Bootstrap
129 lines (123 loc) • 4.68 kB
JavaScript
/**
* @author xeolabs / https://github.com/xeolabs
*/
/**
* @private
*/
class ShadowShaderSource {
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("// Shadow drawing vertex shader");
src.push("attribute vec3 position;");
src.push("uniform mat4 modelMatrix;");
src.push("uniform mat4 viewMatrix;");
src.push("uniform mat4 projMatrix;");
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); ");
src.push("vec4 worldPosition;");
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("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 gl = scene.canvas.gl;
const sectionPlanesState = scene._sectionPlanesState;
const clipping = sectionPlanesState.sectionPlanes.length > 0;
const src = [];
src.push("// Shadow fragment shader");
src.push("precision " + getFragmentFloatPrecision(gl) + " float;");
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("vec4 packDepth (float depth) {");
src.push(" const vec4 bitShift = vec4(1.0, 256.0, 256.0 * 256.0, 256.0 * 256.0 * 256.0);");
src.push(" const vec4 bitMask = vec4(1.0/256.0, 1.0/256.0, 1.0/256.0, 0.0);");
src.push(" vec4 comp = fract(depth * bitShift);");
src.push(" comp -= comp.gbaa * bitMask;");
src.push(" return comp;");
src.push("}");
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 = packDepth(gl_FragCoord.z);");
src.push("}");
return src;
}
function getFragmentFloatPrecision(gl) {
if (!gl.getShaderPrecisionFormat) {
return "mediump";
}
if (gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_FLOAT).precision > 0) {
return "highp";
}
if (gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.MEDIUM_FLOAT).precision > 0) {
return "mediump";
}
return "lowp";
}
export {ShadowShaderSource};