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import { mat4 } from 'gl-matrix';
import * as macro from 'vtk.js/Sources/macros';
import vtkHelper from 'vtk.js/Sources/Rendering/OpenGL/Helper';
import vtkMapper2D from 'vtk.js/Sources/Rendering/Core/Mapper2D';
import vtkPoints from 'vtk.js/Sources/Common/Core/Points';
import vtkPolyData2DFS from 'vtk.js/Sources/Rendering/OpenGL/glsl/vtkPolyData2DFS.glsl';
import vtkPolyData2DVS from 'vtk.js/Sources/Rendering/OpenGL/glsl/vtkPolyData2DVS.glsl';
import vtkReplacementShaderMapper from 'vtk.js/Sources/Rendering/OpenGL/ReplacementShaderMapper';
import vtkShaderProgram from 'vtk.js/Sources/Rendering/OpenGL/ShaderProgram';
import vtkViewNode from 'vtk.js/Sources/Rendering/SceneGraph/ViewNode';
import { round } from 'vtk.js/Sources/Common/Core/Math';
import { DisplayLocation } from 'vtk.js/Sources/Rendering/Core/Property2D/Constants';
import { registerOverride } from 'vtk.js/Sources/Rendering/OpenGL/ViewNodeFactory';
const { primTypes } = vtkHelper;
const { ScalarMode } = vtkMapper2D;
const { vtkErrorMacro } = macro;
const StartEvent = { type: 'StartEvent' };
const EndEvent = { type: 'EndEvent' };
// ----------------------------------------------------------------------------
// vtkOpenGLPolyDataMapper2D methods
// ----------------------------------------------------------------------------
function vtkOpenGLPolyDataMapper2D(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkOpenGLPolyDataMapper2D');
publicAPI.buildPass = (prepass) => {
if (prepass) {
model.openGLActor2D =
publicAPI.getFirstAncestorOfType('vtkOpenGLActor2D');
model._openGLRenderer =
model.openGLActor2D.getFirstAncestorOfType('vtkOpenGLRenderer');
model._openGLRenderWindow = model._openGLRenderer.getLastAncestorOfType(
'vtkOpenGLRenderWindow'
);
model.openGLCamera = model._openGLRenderer.getViewNodeFor(
model._openGLRenderer.getRenderable().getActiveCamera()
);
}
};
publicAPI.overlayPass = (prepass) => {
if (prepass) {
publicAPI.render();
}
};
publicAPI.getShaderTemplate = (shaders, ren, actor) => {
shaders.Vertex = vtkPolyData2DVS;
shaders.Fragment = vtkPolyData2DFS;
shaders.Geometry = '';
};
publicAPI.render = () => {
const ctx = model._openGLRenderWindow.getContext();
if (model.context !== ctx) {
model.context = ctx;
for (let i = primTypes.Start; i < primTypes.End; i++) {
model.primitives[i].setOpenGLRenderWindow(model._openGLRenderWindow);
}
}
const actor = model.openGLActor2D.getRenderable();
const ren = model._openGLRenderer.getRenderable();
publicAPI.renderPiece(ren, actor);
};
publicAPI.renderPiece = (ren, actor) => {
publicAPI.invokeEvent(StartEvent);
if (!model.renderable.getStatic()) {
model.renderable.update();
}
model.currentInput = model.renderable.getInputData();
publicAPI.invokeEvent(EndEvent);
Iif (!model.currentInput) {
vtkErrorMacro('No input!');
return;
}
// if there are no points then we are done
Iif (
!model.currentInput.getPoints ||
!model.currentInput.getPoints().getNumberOfValues()
) {
return;
}
publicAPI.renderPieceStart(ren, actor);
publicAPI.renderPieceDraw(ren, actor);
publicAPI.renderPieceFinish(ren, actor);
};
publicAPI.renderPieceStart = (ren, actor) => {
model.primitiveIDOffset = 0;
Iif (model._openGLRenderer.getSelector()) {
switch (model._openGLRenderer.getSelector().getCurrentPass()) {
default:
model._openGLRenderer.getSelector().renderProp(actor);
}
}
// make sure the BOs are up to date
publicAPI.updateBufferObjects(ren, actor);
// Bind the OpenGL, this is shared between the different primitive/cell types.
model.lastBoundBO = null;
};
publicAPI.getNeedToRebuildShaders = (cellBO, ren, actor) => {
// has something changed that would require us to recreate the shader?
// candidates are
// property modified (representation interpolation and lighting)
// input modified
// light complexity changed
if (
cellBO.getShaderSourceTime().getMTime() < model.renderable.getMTime() ||
cellBO.getShaderSourceTime().getMTime() < model.currentInput.getMTime()
) {
return true;
}
return false;
};
publicAPI.updateBufferObjects = (ren, actor) => {
// Rebuild buffers if needed
if (publicAPI.getNeedToRebuildBufferObjects(ren, actor)) {
publicAPI.buildBufferObjects(ren, actor);
}
};
publicAPI.getNeedToRebuildBufferObjects = (ren, actor) => {
// first do a coarse check
// Note that the actor's mtime includes it's properties mtime
const vmtime = model.VBOBuildTime.getMTime();
if (
vmtime < publicAPI.getMTime() ||
vmtime < model._openGLRenderWindow.getMTime() ||
vmtime < model.renderable.getMTime() ||
vmtime < actor.getMTime() ||
vmtime < model.currentInput.getMTime() ||
(model.renderable.getTransformCoordinate() && vmtime < ren.getMTime())
) {
return true;
}
return false;
};
publicAPI.buildBufferObjects = (ren, actor) => {
const poly = model.currentInput;
Iif (poly === null) {
return;
}
model.renderable.mapScalars(poly, actor.getProperty().getOpacity());
const c = model.renderable.getColorMapColors();
model.haveCellScalars = false;
const scalarMode = model.renderable.getScalarMode();
Iif (model.renderable.getScalarVisibility()) {
// We must figure out how the scalars should be mapped to the polydata.
if (
(scalarMode === ScalarMode.USE_CELL_DATA ||
scalarMode === ScalarMode.USE_CELL_FIELD_DATA ||
scalarMode === ScalarMode.USE_FIELD_DATA ||
!poly.getPointData().getScalars()) &&
scalarMode !== ScalarMode.USE_POINT_FIELD_DATA &&
c
) {
model.haveCellScalars = true;
}
}
const representation = actor.getProperty().getRepresentation();
let tcoords = poly.getPointData().getTCoords();
if (!model.openGLActor2D.getActiveTextures()) {
tcoords = null;
}
const transformCoordinate = model.renderable.getTransformCoordinate();
const view = ren.getRenderWindow().getViews()[0];
const vsize = view.getViewportSize(ren);
const toString =
`${poly.getMTime()}A${representation}B${poly.getMTime()}` +
`C${c ? c.getMTime() : 1}` +
`D${tcoords ? tcoords.getMTime() : 1}` +
`E${transformCoordinate ? ren.getMTime() : 1}` +
`F${vsize}`;
if (model.VBOBuildString !== toString) {
// Build the VBOs
let points = poly.getPoints();
if (transformCoordinate) {
const p = vtkPoints.newInstance();
const numPts = points.getNumberOfPoints();
p.setNumberOfPoints(numPts);
const point = [];
for (let i = 0; i < numPts; ++i) {
points.getPoint(i, point);
transformCoordinate.setValue(point);
const v = transformCoordinate.getComputedDoubleViewportValue(ren);
p.setPoint(i, v[0], v[1], 0.0);
}
points = p;
}
const options = {
points,
tcoords,
colors: c,
cellOffset: 0,
haveCellScalars: model.haveCellSCalars,
customAttributes: model.renderable
.getCustomShaderAttributes()
.map((arrayName) => poly.getPointData().getArrayByName(arrayName)),
};
options.cellOffset += model.primitives[primTypes.Points]
.getCABO()
.createVBO(poly.getVerts(), 'verts', representation, options);
options.cellOffset += model.primitives[primTypes.Lines]
.getCABO()
.createVBO(poly.getLines(), 'lines', representation, options);
options.cellOffset += model.primitives[primTypes.Tris]
.getCABO()
.createVBO(poly.getPolys(), 'polys', representation, options);
options.cellOffset += model.primitives[primTypes.TriStrips]
.getCABO()
.createVBO(poly.getStrips(), 'strips', representation, options);
model.VBOBuildTime.modified();
model.VBOBuildString = toString;
}
};
publicAPI.renderPieceDraw = (ren, actor) => {
const representation = actor.getProperty().getRepresentation();
const gl = model.context;
gl.depthMask(true);
// for every primitive type
for (let i = primTypes.Start; i < primTypes.End; i++) {
// if there are entries
const cabo = model.primitives[i].getCABO();
if (cabo.getElementCount()) {
model.lastBoundBO = model.primitives[i];
model.primitiveIDOffset += model.primitives[i].drawArrays(
ren,
actor,
representation,
publicAPI
);
}
}
};
publicAPI.renderPieceFinish = (ren, actor) => {
if (model.lastBoundBO) {
model.lastBoundBO.getVAO().release();
}
};
publicAPI.replaceShaderValues = (shaders, ren, actor) => {
publicAPI.replaceShaderColor(shaders, ren, actor);
publicAPI.replaceShaderTCoord(shaders, ren, actor);
publicAPI.replaceShaderPicking(shaders, ren, actor);
publicAPI.replaceShaderPositionVC(shaders, ren, actor);
};
publicAPI.replaceShaderColor = (shaders, ren, actor) => {
let VSSource = shaders.Vertex;
let GSSource = shaders.Geometry;
let FSSource = shaders.Fragment;
Iif (model.haveCellScalars) {
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::Color::Dec', [
'uniform samplerBuffer texture1;',
]).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::Color::Impl', [
'gl_FragData[0] = texelFetchBuffer(texture1, gl_PrimitiveID + PrimitiveIDOffset);',
]).result;
}
Iif (model.lastBoundBO.getCABO().getColorComponents() !== 0) {
VSSource = vtkShaderProgram.substitute(VSSource, '//VTK::Color::Dec', [
'in vec4 diffuseColor;',
'out vec4 fcolorVSOutput;',
]).result;
VSSource = vtkShaderProgram.substitute(VSSource, '//VTK::Color::Impl', [
'fcolorVSOutput = diffuseColor;',
]).result;
GSSource = vtkShaderProgram.substitute(GSSource, '//VTK::Color::Dec', [
'in vec4 fcolorVSOutput[];\n',
'out vec4 fcolorGSOutput;',
]).result;
GSSource = vtkShaderProgram.substitute(GSSource, '//VTK::Color::Impl', [
'fcolorGSOutput = fcolorVSOutput[i];',
]).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::Color::Dec', [
'in vec4 fcolorVSOutput;',
]).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::Color::Impl', [
'gl_FragData[0] = fcolorVSOutput;',
]).result;
} else {
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::Color::Dec', [
'uniform vec4 diffuseColor;',
]).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::Color::Impl', [
'gl_FragData[0] = diffuseColor;',
]).result;
}
shaders.Vertex = VSSource;
shaders.Geometry = GSSource;
shaders.Fragment = FSSource;
};
publicAPI.replaceShaderTCoord = (shaders, ren, actor) => {
Iif (model.lastBoundBO.getCABO().getTCoordOffset()) {
let VSSource = shaders.Vertex;
let GSSource = shaders.Geometry;
let FSSource = shaders.Fragment;
const tcdim = model.lastBoundBO.getCABO().getTCoordComponents();
if (tcdim === 1) {
VSSource = vtkShaderProgram.substitute(VSSource, '//VTK::TCoord::Dec', [
'in float tcoordMC;',
'out float tcoordVCVSOutput;',
]).result;
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::TCoord::Impl',
['tcoordVCVSOutput = tcoordMC;']
).result;
GSSource = vtkShaderProgram.substitute(GSSource, '//VTK::TCoord::Dec', [
'in float tcoordVCVSOutput[];\n',
'out float tcoordVCGSOutput;',
]).result;
GSSource = vtkShaderProgram.substitute(GSSource, [
'//VTK::TCoord::Impl',
'tcoordVCGSOutput = tcoordVCVSOutput[i];',
]).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::TCoord::Dec', [
'in float tcoordVCVSOutput;',
'uniform sampler2D texture1;',
]).result;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::TCoord::Impl',
[
'gl_FragData[0] = gl_FragData[0]*texture2D(texture1, vec2(tcoordVCVSOutput,0));',
]
).result;
} else if (tcdim === 2) {
VSSource = vtkShaderProgram.substitute(VSSource, '//VTK::TCoord::Dec', [
'in vec2 tcoordMC;',
'out vec2 tcoordVCVSOutput;',
]).result;
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::TCoord::Impl',
['tcoordVCVSOutput = tcoordMC;']
).result;
GSSource = vtkShaderProgram.substitute(GSSource, '//VTK::TCoord::Dec', [
'in vec2 tcoordVCVSOutput[];\n',
'out vec2 tcoordVCGSOutput;',
]).result;
GSSource = vtkShaderProgram.substitute(
GSSource,
'//VTK::TCoord::Impl',
['tcoordVCGSOutput = tcoordVCVSOutput[i];']
).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::TCoord::Dec', [
'in vec2 tcoordVCVSOutput;',
'uniform sampler2D texture1;',
]).result;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::TCoord::Impl',
[
'gl_FragData[0] = gl_FragData[0]*texture2D(texture1, tcoordVCVSOutput.st);',
]
).result;
}
if (model.haveCellScalars) {
GSSource = vtkShaderProgram.substitute(
GSSource,
'//VTK::PrimID::Impl',
['gl_PrimitiveID = gl_PrimitiveIDIn;']
).result;
}
shaders.Vertex = VSSource;
shaders.Geometry = GSSource;
shaders.Fragment = FSSource;
}
};
publicAPI.replaceShaderPicking = (shaders, ren, actor) => {
let FSSource = shaders.Fragment;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::Picking::Dec', [
'uniform vec3 mapperIndex;',
'uniform int picking;',
]).result;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::Picking::Impl',
' gl_FragData[0] = picking != 0 ? vec4(mapperIndex,1.0) : gl_FragData[0];'
).result;
shaders.Fragment = FSSource;
};
publicAPI.replaceShaderPositionVC = (shaders, ren, actor) => {
// replace common shader code
model.lastBoundBO.replaceShaderPositionVC(shaders, ren, actor);
};
publicAPI.invokeShaderCallbacks = (cellBO, ren, actor) => {
const listCallbacks =
model.renderable.getViewSpecificProperties().ShadersCallbacks;
Iif (listCallbacks) {
listCallbacks.forEach((object) => {
object.callback(object.userData, cellBO, ren, actor);
});
}
};
publicAPI.setMapperShaderParameters = (cellBO, ren, actor) => {
// Now to update the VAO too, if necessary.
Iif (cellBO.getProgram().isUniformUsed('PrimitiveIDOffset')) {
cellBO
.getProgram()
.setUniformi('PrimitiveIDOffset', model.primitiveIDOffset);
}
if (cellBO.getProgram().isAttributeUsed('vertexWC')) {
Iif (
!cellBO
.getVAO()
.addAttributeArray(
cellBO.getProgram(),
cellBO.getCABO(),
'vertexWC',
cellBO.getCABO().getVertexOffset(),
cellBO.getCABO().getStride(),
model.context.FLOAT,
3,
false
)
) {
vtkErrorMacro('Error setting vertexWC in shader VAO.');
}
}
if (
cellBO.getCABO().getElementCount() &&
(model.VBOBuildTime.getMTime() >
cellBO.getAttributeUpdateTime().getMTime() ||
cellBO.getShaderSourceTime().getMTime() >
cellBO.getAttributeUpdateTime().getMTime())
) {
model.renderable.getCustomShaderAttributes().forEach((attrName, idx) => {
if (cellBO.getProgram().isAttributeUsed(`${attrName}MC`)) {
if (
!cellBO
.getVAO()
.addAttributeArray(
cellBO.getProgram(),
cellBO.getCABO(),
`${attrName}MC`,
cellBO.getCABO().getCustomData()[idx].offset,
cellBO.getCABO().getStride(),
model.context.FLOAT,
cellBO.getCABO().getCustomData()[idx].components,
false
)
) {
vtkErrorMacro(`Error setting ${attrName}MC in shader VAO.`);
}
}
});
Iif (
cellBO.getProgram().isAttributeUsed('tcoordMC') &&
cellBO.getCABO().getTCoordOffset()
) {
if (
!cellBO
.getVAO()
.addAttributeArray(
cellBO.getProgram(),
cellBO.getCABO(),
'tcoordMC',
cellBO.getCABO().getTCoordOffset(),
cellBO.getCABO().getStride(),
model.context.FLOAT,
cellBO.getCABO().getTCoordComponents(),
false
)
) {
vtkErrorMacro('Error setting tcoordMC in shader VAO.');
}
} else {
cellBO.getVAO().removeAttributeArray('tcoordMC');
}
Iif (
model.internalColorTexture &&
cellBO.getProgram().isUniformUsed('texture1')
) {
cellBO
.getProgram()
.setUniformi('texture1', model.internalColorTexture.getTextureUnit());
}
const tus = model.openGLActor2D.getActiveTextures();
Iif (tus) {
for (let index = 0; index < tus.length; ++index) {
const tex = tus[index];
const texUnit = tex.getTextureUnit();
const tname = `texture${texUnit + 1}`;
if (cellBO.getProgram().isUniformUsed(tname)) {
cellBO.getProgram().setUniformi(tname, texUnit);
}
}
}
// handle wide lines
cellBO.setMapperShaderParameters(
ren,
actor,
model._openGLRenderer.getTiledSizeAndOrigin()
);
const selector = model._openGLRenderer.getSelector();
cellBO
.getProgram()
.setUniform3fArray(
'mapperIndex',
selector ? selector.getPropColorValue() : [0.0, 0.0, 0.0]
);
cellBO
.getProgram()
.setUniformi('picking', selector ? selector.getCurrentPass() + 1 : 0);
}
};
publicAPI.setPropertyShaderParameters = (cellBO, ren, actor) => {
const c = model.renderable.getColorMapColors();
if (!c || c.getNumberOfComponents() === 0) {
const program = cellBO.getProgram();
const ppty = actor.getProperty();
const opacity = ppty.getOpacity();
const dColor = ppty.getColor();
const diffuseColor = [dColor[0], dColor[1], dColor[2], opacity];
program.setUniform4f('diffuseColor', diffuseColor);
}
};
publicAPI.setLightingShaderParameters = (cellBO, ren, actor) => {
// no-op
};
function safeMatrixMultiply(matrixArray, matrixType, tmpMat) {
matrixType.identity(tmpMat);
return matrixArray.reduce((res, matrix, index) => {
if (index === 0) {
return matrix ? matrixType.copy(res, matrix) : matrixType.identity(res);
}
return matrix ? matrixType.multiply(res, res, matrix) : res;
}, tmpMat);
}
publicAPI.setCameraShaderParameters = (cellBO, ren, actor) => {
const program = cellBO.getProgram();
const shiftScaleEnabled = cellBO.getCABO().getCoordShiftAndScaleEnabled();
const inverseShiftScaleMatrix = shiftScaleEnabled
? cellBO.getCABO().getInverseShiftAndScaleMatrix()
: null;
// Get the position of the actor
const view = ren.getRenderWindow().getViews()[0];
const size = view.getViewportSize(ren);
const vport = ren.getViewport();
const actorPos = actor
.getActualPositionCoordinate()
.getComputedDoubleViewportValue(ren);
// Get the window info
// Assume tile viewport is 0 1 based on vtkOpenGLRenderer
const tileViewport = [0.0, 0.0, 1.0, 1.0];
const visVP = [0.0, 0.0, 1.0, 1.0];
visVP[0] = vport[0] >= tileViewport[0] ? vport[0] : tileViewport[0];
visVP[1] = vport[1] >= tileViewport[1] ? vport[1] : tileViewport[1];
visVP[2] = vport[2] <= tileViewport[2] ? vport[2] : tileViewport[2];
visVP[3] = vport[3] <= tileViewport[3] ? vport[3] : tileViewport[3];
Iif (visVP[0] >= visVP[2]) {
return;
}
Iif (visVP[1] >= visVP[3]) {
return;
}
size[0] = round((size[0] * (visVP[2] - visVP[0])) / (vport[2] - vport[0]));
size[1] = round((size[1] * (visVP[3] - visVP[1])) / (vport[3] - vport[1]));
const winSize = model._openGLRenderer.getParent().getSize();
const xoff = round(actorPos[0] - (visVP[0] - vport[0]) * winSize[0]);
const yoff = round(actorPos[1] - (visVP[1] - vport[1]) * winSize[1]);
// set ortho projection
const left = -xoff;
let right = -xoff + size[0];
const bottom = -yoff;
let top = -yoff + size[1];
// it's an error to call glOrtho with
// either left==right or top==bottom
Iif (left === right) {
right = left + 1.0;
}
Iif (bottom === top) {
top = bottom + 1.0;
}
// compute the combined ModelView matrix and send it down to save time in the shader
const tmpMat4 = mat4.identity(new Float64Array(16));
tmpMat4[0] = 2.0 / (right - left);
tmpMat4[1 * 4 + 1] = 2.0 / (top - bottom);
tmpMat4[0 * 4 + 3] = (-1.0 * (right + left)) / (right - left);
tmpMat4[1 * 4 + 3] = (-1.0 * (top + bottom)) / (top - bottom);
tmpMat4[2 * 4 + 2] = 0.0;
tmpMat4[2 * 4 + 3] =
actor.getProperty().getDisplayLocation() === DisplayLocation.FOREGROUND
? -1.0
: 1.0;
tmpMat4[3 * 4 + 3] = 1.0;
mat4.transpose(tmpMat4, tmpMat4);
program.setUniformMatrix(
'WCVCMatrix',
safeMatrixMultiply(
[tmpMat4, inverseShiftScaleMatrix],
mat4,
model.tmpMat4
)
);
};
publicAPI.getAllocatedGPUMemoryInBytes = () => {
let memUsed = 0;
model.primitives.forEach((prim) => {
memUsed += prim.getAllocatedGPUMemoryInBytes();
});
// Return in MB
return memUsed;
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
context: null,
VBOBuildTime: 0,
VBOBuildString: null,
primitives: null,
primTypes: null,
shaderRebuildString: null,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Inheritance
vtkViewNode.extend(publicAPI, model, initialValues);
vtkReplacementShaderMapper.implementReplaceShaderCoincidentOffset(
publicAPI,
model,
initialValues
);
vtkReplacementShaderMapper.implementBuildShadersWithReplacements(
publicAPI,
model,
initialValues
);
model.primitives = [];
model.primTypes = primTypes;
model.tmpMat4 = mat4.identity(new Float64Array(16));
for (let i = primTypes.Start; i < primTypes.End; i++) {
model.primitives[i] = vtkHelper.newInstance();
model.primitives[i].setPrimitiveType(i);
model.primitives[i].set(
{ lastLightComplexity: 0, lastLightCount: 0, lastSelectionPass: false },
true
);
}
// Build VTK API
macro.setGet(publicAPI, model, ['context']);
model.VBOBuildTime = {};
macro.obj(model.VBOBuildTime, { mtime: 0 });
// Object methods
vtkOpenGLPolyDataMapper2D(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(
extend,
'vtkOpenGLPolyDataMapper2D'
);
// ----------------------------------------------------------------------------
export default { newInstance, extend };
// Register ourself to OpenGL backend if imported
registerOverride('vtkMapper2D', newInstance);
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