@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
159 lines (153 loc) • 6.09 kB
JavaScript
/**
* @private
*/
class EmphasisEdgesShaderSource {
constructor(mesh) {
this.vertex = buildVertex(mesh);
this.fragment = buildFragment(mesh);
}
}
function buildVertex(mesh) {
const scene = mesh.scene;
const sectionPlanesState = scene._sectionPlanesState;
const clipping = sectionPlanesState.getNumAllocatedSectionPlanes() > 0;
const quantizedGeometry = !!mesh._geometry._state.compressGeometry;
const billboard = mesh._state.billboard;
const stationary = mesh._state.stationary;
const src = [];
src.push("#version 300 es");
src.push("// Edges drawing vertex shader");
src.push("in vec3 position;");
src.push("uniform mat4 modelMatrix;");
src.push("uniform mat4 viewMatrix;");
src.push("uniform mat4 projMatrix;");
src.push("uniform vec4 edgeColor;");
src.push("uniform vec3 offset;");
if (quantizedGeometry) {
src.push("uniform mat4 positionsDecodeMatrix;");
}
if (scene.logarithmicDepthBufferEnabled) {
src.push("uniform float logDepthBufFC;");
src.push("out float vFragDepth;");
src.push("bool isPerspectiveMatrix(mat4 m) {");
src.push(" return (m[2][3] == - 1.0);");
src.push("}");
src.push("out float isPerspective;");
}
if (clipping) {
src.push("out vec4 vWorldPosition;");
}
src.push("out vec4 vColor;");
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("billboard(modelViewMatrix);");
src.push("worldPosition = modelMatrix2 * localPosition;");
src.push("worldPosition.xyz = worldPosition.xyz + offset;");
src.push("vec4 viewPosition = modelViewMatrix * localPosition;");
} else {
src.push("worldPosition = modelMatrix2 * localPosition;");
src.push("worldPosition.xyz = worldPosition.xyz + offset;");
src.push("vec4 viewPosition = viewMatrix2 * worldPosition; ");
}
src.push("vColor = edgeColor;");
if (clipping) {
src.push("vWorldPosition = worldPosition;");
}
src.push("vec4 clipPos = projMatrix * viewPosition;");
if (scene.logarithmicDepthBufferEnabled) {
src.push("vFragDepth = 1.0 + clipPos.w;");
src.push("isPerspective = float (isPerspectiveMatrix(projMatrix));");
}
src.push("gl_Position = clipPos;");
src.push("}");
return src;
}
function buildFragment(mesh) {
const scene = mesh.scene;
const sectionPlanesState = mesh.scene._sectionPlanesState;
const gammaOutput = mesh.scene.gammaOutput;
const clipping = sectionPlanesState.getNumAllocatedSectionPlanes() > 0;
const src = [];
src.push("#version 300 es");
src.push("// Edges drawing fragment shader");
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) {
src.push("in float isPerspective;");
src.push("uniform float logDepthBufFC;");
src.push("in float vFragDepth;");
}
if (gammaOutput) {
src.push("uniform float gammaFactor;");
src.push("vec4 linearToGamma( in vec4 value, in float gammaFactor ) {");
src.push(" return vec4( pow( value.xyz, vec3( 1.0 / gammaFactor ) ), value.w );");
src.push("}");
}
if (clipping) {
src.push("in vec4 vWorldPosition;");
src.push("uniform bool clippable;");
for (let i = 0, len = sectionPlanesState.getNumAllocatedSectionPlanes(); i < len; i++) {
src.push("uniform bool sectionPlaneActive" + i + ";");
src.push("uniform vec3 sectionPlanePos" + i + ";");
src.push("uniform vec3 sectionPlaneDir" + i + ";");
}
}
src.push("in vec4 vColor;");
src.push("out vec4 outColor;");
src.push("void main(void) {");
if (clipping) {
src.push("if (clippable) {");
src.push(" float dist = 0.0;");
for (let i = 0, len = sectionPlanesState.getNumAllocatedSectionPlanes(); i < len; 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) {
src.push("gl_FragDepth = isPerspective == 0.0 ? gl_FragCoord.z : log2( vFragDepth ) * logDepthBufFC * 0.5;");
}
if (gammaOutput) {
src.push("outColor = linearToGamma(vColor, gammaFactor);");
} else {
src.push("outColor = vColor;");
}
src.push("}");
return src;
}
export {EmphasisEdgesShaderSource};