Reference Source

src/viewer/scene/PerformanceModel/lib/instancing/instancingEdgesShaderSource.js

/**
 * @author xeolabs / https://github.com/xeolabs
 */

import {RENDER_PASSES} from '../renderPasses.js';

/**
 * @private
 */
const InstancingEdgesShaderSource = function (layer) {
    this.vertex = buildVertex(layer);
    this.fragment = buildFragment(layer);
};

function buildVertex(layer) {
    const scene = layer.model.scene;
    const sectionPlanesState = scene._sectionPlanesState;
    const clipping = sectionPlanesState.sectionPlanes.length > 0;
    const src = [];
    src.push("// Instancing edges vertex shader");
    src.push("precision mediump float;");
    src.push("precision mediump int;");
    src.push("uniform int renderPass;");
    src.push("attribute vec3 position;");
    src.push("attribute vec4 flags;");
    src.push("attribute vec4 flags2;");
    src.push("attribute vec4 modelMatrixCol0;"); // Modeling matrix
    src.push("attribute vec4 modelMatrixCol1;");
    src.push("attribute vec4 modelMatrixCol2;");
    src.push("uniform mat4 viewMatrix;");
    src.push("uniform mat4 projMatrix;");
    src.push("uniform mat4 positionsDecodeMatrix;");
    if (clipping) {
        src.push("varying vec4 vWorldPosition;");
        src.push("varying vec4 vFlags2;");
    }
    src.push("uniform vec4 color;");
    src.push("void main(void) {");

    src.push("bool visible      = (float(flags.x) > 0.0);");
    src.push("bool xrayed       = (float(flags.y) > 0.0);");
    src.push("bool highlighted  = (float(flags.z) > 0.0);");
    src.push("bool selected     = (float(flags.w) > 0.0);");
    src.push("bool edges        = (float(flags2.y) > 0.0);");

    src.push("bool transparent  = (color.a < 1.0);"); // Color comes from EdgeMaterial.edgeColor, so is not quantized

    src.push(`
     if (!visible || !edges ||
        (renderPass == ${RENDER_PASSES.NORMAL_OPAQUE} && (transparent || xrayed || selected)) ||
    (renderPass == ${RENDER_PASSES.NORMAL_TRANSPARENT} &&  (!transparent || xrayed || highlighted || selected)) ||
    (renderPass == ${RENDER_PASSES.XRAYED} && (!xrayed || highlighted || selected)) ||
    (renderPass == ${RENDER_PASSES.HIGHLIGHTED} && !highlighted) ||
    (renderPass == ${RENDER_PASSES.SELECTED} && !selected)) {`);

    src.push("   gl_Position = vec4(0.0, 0.0, 0.0, 0.0);"); // Cull vertex
    src.push("} else {");
    src.push("vec4 worldPosition = positionsDecodeMatrix * vec4(position, 1.0); ");
    src.push("worldPosition = vec4(dot(worldPosition, modelMatrixCol0), dot(worldPosition, modelMatrixCol1), dot(worldPosition, modelMatrixCol2), 1.0);");
    src.push("vec4 viewPosition  = viewMatrix * worldPosition; ");
    if (clipping) {
        src.push("vWorldPosition = worldPosition;");
        src.push("vFlags2 = flags2;");
    }
    src.push("gl_Position = projMatrix * viewPosition;");
    src.push("}");
    src.push("}");
    return src;
}


function buildFragment(layer) {
    const scene = layer.model.scene;
    const sectionPlanesState = scene._sectionPlanesState;
    const clipping = sectionPlanesState.sectionPlanes.length > 0;
    let i;
    let len;
    const src = [];
    src.push("// Instancing edges fragment shader");
    src.push("precision mediump float;");
    src.push("precision mediump int;");
    src.push("uniform vec4 color;");
    if (clipping) {
        src.push("varying vec4 vWorldPosition;");
        src.push("varying vec4 vFlags2;");
        for (i = 0, len = sectionPlanesState.sectionPlanes.length; i < len; 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("  bool clippable = (float(vFlags2.x) > 0.0);");
        src.push("  if (clippable) {");
        src.push("  float dist = 0.0;");
        for (i = 0, len = sectionPlanesState.sectionPlanes.length; 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("}");
    }
    src.push("gl_FragColor = color;");
    src.push("}");
    return src;
}

export {InstancingEdgesShaderSource};