Actor

Source

index.js
import { mat4 } from 'gl-matrix';

import macro from 'vtk.js/Sources/macros';
import vtkViewNode from 'vtk.js/Sources/Rendering/SceneGraph/ViewNode';

import { registerOverride } from 'vtk.js/Sources/Rendering/WebGPU/ViewNodeFactory';

// ----------------------------------------------------------------------------
// vtkWebGPUActor methods
// ----------------------------------------------------------------------------

function vtkWebGPUActor(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkWebGPUActor');

// Builds myself.
publicAPI.buildPass = (prepass) => {
if (prepass) {
model.WebGPURenderer = publicAPI.getFirstAncestorOfType(
'vtkWebGPURenderer'
);
model.WebGPURenderWindow = model.WebGPURenderer.getFirstAncestorOfType(
'vtkWebGPURenderWindow'
);
if (model.propID === undefined) {
model.propID = model.WebGPURenderWindow.getUniquePropID();
}
publicAPI.prepareNodes();
publicAPI.addMissingNode(model.renderable.getMapper());
publicAPI.removeUnusedNodes();
}
};

// we draw textures, then mapper, then post pass textures
publicAPI.traverseOpaquePass = (renderPass) => {
if (
!model.renderable ||
!model.renderable.getNestedVisibility() ||
!model.renderable.getIsOpaque() ||
(model.WebGPURenderer.getSelector() &&
!model.renderable.getNestedPickable())
) {
return;
}

publicAPI.apply(renderPass, true);

if (model.children[0]) {
model.children[0].traverse(renderPass);
}

publicAPI.apply(renderPass, false);
};

// we draw textures, then mapper, then post pass textures
publicAPI.traverseTranslucentPass = (renderPass) => {
if (
!model.renderable ||
!model.renderable.getNestedVisibility() ||
model.renderable.getIsOpaque() ||
(model.WebGPURenderer.getSelector() &&
!model.renderable.getNestedPickable())
) {
return;
}

publicAPI.apply(renderPass, true);

if (model.children[0]) {
model.children[0].traverse(renderPass);
}

publicAPI.apply(renderPass, false);
};

publicAPI.queryPass = (prepass, renderPass) => {
if (prepass) {
if (!model.renderable || !model.renderable.getVisibility()) {
return;
}
if (model.renderable.getIsOpaque()) {
renderPass.incrementOpaqueActorCount();
} else {
renderPass.incrementTranslucentActorCount();
}
}
};

publicAPI.getBufferShift = (wgpuRen) => {
publicAPI.getKeyMatrices(wgpuRen);
return model.bufferShift;
};

publicAPI.getKeyMatrices = (wgpuRen) => {
// has the actor or stabilization center changed?
if (
Math.max(model.renderable.getMTime(), wgpuRen.getStabilizedTime()) >
model.keyMatricesTime.getMTime()
) {
model.renderable.computeMatrix();

const mcwc = model.renderable.getMatrix();

// compute the net shift
const center = wgpuRen.getStabilizedCenterByReference();
model.bufferShift[0] = mcwc[3] - center[0];
model.bufferShift[1] = mcwc[7] - center[1];
model.bufferShift[2] = mcwc[11] - center[2];

mat4.transpose(model.keyMatrices.bcwc, mcwc);

if (model.renderable.getIsIdentity()) {
mat4.identity(model.keyMatrices.normalMatrix);
} else {
// we use bcwc BEFORE the translate below (just to get transposed mcvc)
mat4.copy(model.keyMatrices.normalMatrix, model.keyMatrices.bcwc);
// zero out translation
model.keyMatrices.normalMatrix[3] = 0.0;
model.keyMatrices.normalMatrix[7] = 0.0;
model.keyMatrices.normalMatrix[11] = 0.0;
mat4.invert(
model.keyMatrices.normalMatrix,
model.keyMatrices.normalMatrix
);
mat4.transpose(
model.keyMatrices.normalMatrix,
model.keyMatrices.normalMatrix
);
}

// only meed the buffer shift to get to world
mat4.translate(model.keyMatrices.bcwc, model.keyMatrices.bcwc, [
-model.bufferShift[0],
-model.bufferShift[1],
-model.bufferShift[2],
]);

// to get to stabilized we also need the center
mat4.translate(model.keyMatrices.bcsc, model.keyMatrices.bcwc, [
-center[0],
-center[1],
-center[2],
]);

model.keyMatricesTime.modified();
}

return model.keyMatrices;
};
}

// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {
keyMatricesTime: null,
keyMatrices: null,
propID: undefined,
bufferShift: undefined,
};

// ----------------------------------------------------------------------------

export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);

// Inheritance
vtkViewNode.extend(publicAPI, model, initialValues);

model.keyMatricesTime = {};
macro.obj(model.keyMatricesTime, { mtime: 0 });
model.keyMatrices = {
normalMatrix: new Float64Array(16),
bcwc: new Float64Array(16),
bcsc: new Float64Array(16),
};

macro.get(publicAPI, model, ['propID', 'keyMatricesTime']);

model.bufferShift = [0, 0, 0, 0];

// Object methods
vtkWebGPUActor(publicAPI, model);
}

// ----------------------------------------------------------------------------

export const newInstance = macro.newInstance(extend);

// ----------------------------------------------------------------------------

export default { newInstance, extend };

// Register ourself to WebGPU backend if imported
registerOverride('vtkActor', newInstance);