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import { mat4, mat3, vec3 } from 'gl-matrix';
import vtkClosedPolyLineToSurfaceFilter from 'vtk.js/Sources/Filters/General/ClosedPolyLineToSurfaceFilter';
import vtkCutter from 'vtk.js/Sources/Filters/Core/Cutter';
import vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
import vtkHelper from 'vtk.js/Sources/Rendering/OpenGL/Helper';
import vtkImageDataOutlineFilter from 'vtk.js/Sources/Filters/General/ImageDataOutlineFilter';
import vtkMath from 'vtk.js/Sources/Common/Core/Math';
import vtkOpenGLTexture from 'vtk.js/Sources/Rendering/OpenGL/Texture';
import vtkPlane from 'vtk.js/Sources/Common/DataModel/Plane';
import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData';
import vtkReplacementShaderMapper from 'vtk.js/Sources/Rendering/OpenGL/ReplacementShaderMapper';
import vtkShaderProgram from 'vtk.js/Sources/Rendering/OpenGL/ShaderProgram';
import vtkTransform from 'vtk.js/Sources/Common/Transform/Transform';
import vtkViewNode from 'vtk.js/Sources/Rendering/SceneGraph/ViewNode';
import {
getTransferFunctionHash,
getImageDataHash,
} from 'vtk.js/Sources/Rendering/OpenGL/RenderWindow/resourceSharingHelper';
import vtkImageResliceMapperVS from 'vtk.js/Sources/Rendering/OpenGL/glsl/vtkImageResliceMapperVS.glsl';
import vtkImageResliceMapperFS from 'vtk.js/Sources/Rendering/OpenGL/glsl/vtkImageResliceMapperFS.glsl';
import { Filter } from 'vtk.js/Sources/Rendering/OpenGL/Texture/Constants';
import { InterpolationType } from 'vtk.js/Sources/Rendering/Core/ImageProperty/Constants';
import { Representation } from 'vtk.js/Sources/Rendering/Core/Property/Constants';
import { VtkDataTypes } from 'vtk.js/Sources/Common/Core/DataArray/Constants';
import { registerOverride } from 'vtk.js/Sources/Rendering/OpenGL/ViewNodeFactory';
import { Resolve } from 'vtk.js/Sources/Rendering/Core/Mapper/CoincidentTopologyHelper';
const { vtkErrorMacro } = macro;
// ----------------------------------------------------------------------------
// helper methods
// ----------------------------------------------------------------------------
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);
}
// ----------------------------------------------------------------------------
// vtkOpenGLImageResliceMapper methods
// ----------------------------------------------------------------------------
function vtkOpenGLImageResliceMapper(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkOpenGLImageResliceMapper');
function unregisterGraphicsResources(renderWindow) {
[model._scalars, model._colorTransferFunc, model._pwFunc].forEach(
(coreObject) =>
renderWindow.unregisterGraphicsResourceUser(coreObject, publicAPI)
);
}
publicAPI.buildPass = (prepass) => {
if (prepass) {
model.currentRenderPass = null;
model._openGLImageSlice = publicAPI.getFirstAncestorOfType(
'vtkOpenGLImageSlice'
);
model._openGLRenderer =
publicAPI.getFirstAncestorOfType('vtkOpenGLRenderer');
const ren = model._openGLRenderer.getRenderable();
model._openGLCamera = model._openGLRenderer.getViewNodeFor(
ren.getActiveCamera()
);
const oldOglRenderWindow = model._openGLRenderWindow;
model._openGLRenderWindow = model._openGLRenderer.getLastAncestorOfType(
'vtkOpenGLRenderWindow'
);
Iif (
oldOglRenderWindow &&
!oldOglRenderWindow.isDeleted() &&
oldOglRenderWindow !== model._openGLRenderWindow
) {
// Unregister the mapper when the render window changes
unregisterGraphicsResources(oldOglRenderWindow);
}
model.context = model._openGLRenderWindow.getContext();
model.tris.setOpenGLRenderWindow(model._openGLRenderWindow);
}
};
publicAPI.translucentPass = (prepass, renderPass) => {
if (prepass) {
model.currentRenderPass = renderPass;
publicAPI.render();
}
};
publicAPI.zBufferPass = (prepass) => {
if (prepass) {
model.haveSeenDepthRequest = true;
model.renderDepth = true;
publicAPI.render();
model.renderDepth = false;
}
};
publicAPI.opaqueZBufferPass = (prepass) => publicAPI.zBufferPass(prepass);
publicAPI.opaquePass = (prepass) => {
if (prepass) {
publicAPI.render();
}
};
publicAPI.getCoincidentParameters = (ren, actor) => {
if (
// backwards compat with code that (errorneously) set this to boolean
// eslint-disable-next-line eqeqeq
model.renderable.getResolveCoincidentTopology() == Resolve.PolygonOffset
) {
return model.renderable.getCoincidentTopologyPolygonOffsetParameters();
}
return null;
};
// Renders myself
publicAPI.render = () => {
const actor = model._openGLImageSlice.getRenderable();
const ren = model._openGLRenderer.getRenderable();
publicAPI.renderPiece(ren, actor);
};
publicAPI.renderPiece = (ren, actor) => {
publicAPI.invokeEvent({ type: 'StartEvent' });
model.renderable.update();
model.currentInput = model.renderable.getInputData();
if (!model.currentInput) {
vtkErrorMacro('No input!');
return;
}
publicAPI.updateResliceGeometry();
publicAPI.renderPieceStart(ren, actor);
publicAPI.renderPieceDraw(ren, actor);
publicAPI.renderPieceFinish(ren, actor);
publicAPI.invokeEvent({ type: 'EndEvent' });
};
publicAPI.renderPieceStart = (ren, actor) => {
// make sure the BOs are up to date
publicAPI.updateBufferObjects(ren, actor);
const iType = actor.getProperty().getInterpolationType();
if (iType === InterpolationType.NEAREST) {
model.openGLTexture.setMinificationFilter(Filter.NEAREST);
model.openGLTexture.setMagnificationFilter(Filter.NEAREST);
model.colorTexture.setMinificationFilter(Filter.NEAREST);
model.colorTexture.setMagnificationFilter(Filter.NEAREST);
model.pwfTexture.setMinificationFilter(Filter.NEAREST);
model.pwfTexture.setMagnificationFilter(Filter.NEAREST);
} else {
model.openGLTexture.setMinificationFilter(Filter.LINEAR);
model.openGLTexture.setMagnificationFilter(Filter.LINEAR);
model.colorTexture.setMinificationFilter(Filter.LINEAR);
model.colorTexture.setMagnificationFilter(Filter.LINEAR);
model.pwfTexture.setMinificationFilter(Filter.LINEAR);
model.pwfTexture.setMagnificationFilter(Filter.LINEAR);
}
// No buffer objects bound.
model.lastBoundBO = null;
};
publicAPI.renderPieceDraw = (ren, actor) => {
const gl = model.context;
// render the texture
model.openGLTexture.activate();
model.colorTexture.activate();
model.pwfTexture.activate();
// update shaders if required
publicAPI.updateShaders(model.tris, ren, actor);
// Finally draw
gl.drawArrays(gl.TRIANGLES, 0, model.tris.getCABO().getElementCount());
model.tris.getVAO().release();
model.openGLTexture.deactivate();
model.colorTexture.deactivate();
model.pwfTexture.deactivate();
};
publicAPI.renderPieceFinish = (ren, actor) => {};
publicAPI.updateBufferObjects = (ren, actor) => {
// Rebuild buffer objects if needed
if (publicAPI.getNeedToRebuildBufferObjects(ren, actor)) {
publicAPI.buildBufferObjects(ren, actor);
}
};
publicAPI.getNeedToRebuildBufferObjects = (ren, actor) =>
model.VBOBuildTime.getMTime() < publicAPI.getMTime() ||
model.VBOBuildTime.getMTime() < actor.getMTime() ||
model.VBOBuildTime.getMTime() < model.renderable.getMTime() ||
model.VBOBuildTime.getMTime() < actor.getProperty().getMTime() ||
model.VBOBuildTime.getMTime() < model.currentInput.getMTime() ||
model.VBOBuildTime.getMTime() < model.resliceGeom.getMTime() ||
!model.openGLTexture?.getHandle() ||
!model.colorTexture?.getHandle() ||
!model.pwfTexture?.getHandle();
publicAPI.buildBufferObjects = (ren, actor) => {
const image = model.currentInput;
Iif (!image) {
return;
}
const scalars = image.getPointData()?.getScalars();
Iif (!scalars) {
return;
}
const numComp = scalars.getNumberOfComponents();
let toString = getImageDataHash(image, scalars);
const tex = model._openGLRenderWindow.getGraphicsResourceForObject(scalars);
const reBuildTex = !tex?.oglObject?.getHandle() || tex?.hash !== toString;
if (reBuildTex) {
model.openGLTexture = vtkOpenGLTexture.newInstance();
model.openGLTexture.setOpenGLRenderWindow(model._openGLRenderWindow);
// Build the image scalar texture
const dims = image.getDimensions();
// Use norm16 for the 3D texture if the extension is available
model.openGLTexture.setOglNorm16Ext(
model.context.getExtension('EXT_texture_norm16')
);
model.openGLTexture.resetFormatAndType();
model.openGLTexture.create3DFilterableFromDataArray(
dims[0],
dims[1],
dims[2],
scalars
);
model._openGLRenderWindow.setGraphicsResourceForObject(
scalars,
model.openGLTexture,
toString
);
if (scalars !== model._scalars) {
model._openGLRenderWindow.registerGraphicsResourceUser(
scalars,
publicAPI
);
model._openGLRenderWindow.unregisterGraphicsResourceUser(
model._scalars,
publicAPI
);
}
model._scalars = scalars;
} else {
model.openGLTexture = tex.oglObject;
}
const ppty = actor.getProperty();
const iComps = ppty.getIndependentComponents();
const numIComps = iComps ? numComp : 1;
const textureHeight = iComps ? 2 * numIComps : 1;
const colorTransferFunc = ppty.getRGBTransferFunction();
toString = getTransferFunctionHash(colorTransferFunc, iComps, numIComps);
const cTex =
model._openGLRenderWindow.getGraphicsResourceForObject(colorTransferFunc);
const reBuildC = !cTex?.oglObject?.getHandle() || cTex?.hash !== toString;
if (reBuildC) {
const cWidth = 1024;
const cSize = cWidth * textureHeight * 3;
const cTable = new Uint8ClampedArray(cSize);
model.colorTexture = vtkOpenGLTexture.newInstance();
model.colorTexture.setOpenGLRenderWindow(model._openGLRenderWindow);
if (colorTransferFunc) {
const tmpTable = new Float32Array(cWidth * 3);
for (let c = 0; c < numIComps; c++) {
const cfun = ppty.getRGBTransferFunction(c);
const cRange = cfun.getRange();
cfun.getTable(cRange[0], cRange[1], cWidth, tmpTable, 1);
if (iComps) {
for (let i = 0; i < cWidth * 3; i++) {
cTable[c * cWidth * 6 + i] = 255.0 * tmpTable[i];
cTable[c * cWidth * 6 + i + cWidth * 3] = 255.0 * tmpTable[i];
}
} else {
for (let i = 0; i < cWidth * 3; i++) {
cTable[c * cWidth * 6 + i] = 255.0 * tmpTable[i];
}
}
}
model.colorTexture.resetFormatAndType();
model.colorTexture.create2DFromRaw(
cWidth,
textureHeight,
3,
VtkDataTypes.UNSIGNED_CHAR,
cTable
);
} else E{
for (let i = 0; i < cWidth * 3; ++i) {
cTable[i] = (255.0 * i) / ((cWidth - 1) * 3);
cTable[i + 1] = (255.0 * i) / ((cWidth - 1) * 3);
cTable[i + 2] = (255.0 * i) / ((cWidth - 1) * 3);
}
model.colorTexture.resetFormatAndType();
model.colorTexture.create2DFromRaw(
cWidth,
1,
3,
VtkDataTypes.UNSIGNED_CHAR,
cTable
);
}
if (colorTransferFunc) {
model._openGLRenderWindow.setGraphicsResourceForObject(
colorTransferFunc,
model.colorTexture,
toString
);
if (colorTransferFunc !== model._colorTransferFunc) {
model._openGLRenderWindow.registerGraphicsResourceUser(
colorTransferFunc,
publicAPI
);
model._openGLRenderWindow.unregisterGraphicsResourceUser(
model._colorTransferFunc,
publicAPI
);
}
model._colorTransferFunc = colorTransferFunc;
}
} else {
model.colorTexture = cTex.oglObject;
}
// Build piecewise function buffer. This buffer is used either
// for component weighting or opacity, depending on whether we're
// rendering components independently or not.
const pwFunc = ppty.getPiecewiseFunction();
toString = getTransferFunctionHash(pwFunc, iComps, numIComps);
const pwfTex =
model._openGLRenderWindow.getGraphicsResourceForObject(pwFunc);
// rebuild opacity tfun?
const reBuildPwf =
!pwfTex?.oglObject?.getHandle() || pwfTex?.hash !== toString;
if (reBuildPwf) {
const pwfWidth = 1024;
const pwfSize = pwfWidth * textureHeight;
const pwfTable = new Uint8ClampedArray(pwfSize);
model.pwfTexture = vtkOpenGLTexture.newInstance();
model.pwfTexture.setOpenGLRenderWindow(model._openGLRenderWindow);
if (pwFunc) {
const pwfFloatTable = new Float32Array(pwfSize);
const tmpTable = new Float32Array(pwfWidth);
for (let c = 0; c < numIComps; ++c) {
const pwfun = ppty.getPiecewiseFunction(c);
Iif (pwfun === null) {
// Piecewise constant max if no function supplied for this component
pwfFloatTable.fill(1.0);
} else {
const pwfRange = pwfun.getRange();
pwfun.getTable(pwfRange[0], pwfRange[1], pwfWidth, tmpTable, 1);
// adjust for sample distance etc
if (iComps) {
for (let i = 0; i < pwfWidth; i++) {
pwfFloatTable[c * pwfWidth * 2 + i] = tmpTable[i];
pwfFloatTable[c * pwfWidth * 2 + i + pwfWidth] = tmpTable[i];
}
} else {
for (let i = 0; i < pwfWidth; i++) {
pwfFloatTable[c * pwfWidth * 2 + i] = tmpTable[i];
}
}
}
}
model.pwfTexture.resetFormatAndType();
model.pwfTexture.create2DFromRaw(
pwfWidth,
textureHeight,
1,
VtkDataTypes.FLOAT,
pwfFloatTable
);
} else E{
// default is opaque
pwfTable.fill(255.0);
model.pwfTexture.resetFormatAndType();
model.pwfTexture.create2DFromRaw(
pwfWidth,
1,
1,
VtkDataTypes.UNSIGNED_CHAR,
pwfTable
);
}
if (pwFunc) {
model._openGLRenderWindow.setGraphicsResourceForObject(
pwFunc,
model.pwfTexture,
toString
);
if (pwFunc !== model._pwFunc) {
model._openGLRenderWindow.registerGraphicsResourceUser(
pwFunc,
publicAPI
);
model._openGLRenderWindow.unregisterGraphicsResourceUser(
model._pwFunc,
publicAPI
);
}
model._pwFunc = pwFunc;
}
} else {
model.pwfTexture = pwfTex.oglObject;
}
const vboString = `${model.resliceGeom.getMTime()}A${model.renderable.getSlabThickness()}`;
if (
!model.tris.getCABO().getElementCount() ||
model.VBOBuildString !== vboString
) {
const points = vtkDataArray.newInstance({
numberOfComponents: 3,
values: model.resliceGeom.getPoints().getData(),
});
points.setName('points');
const cells = vtkDataArray.newInstance({
numberOfComponents: 1,
values: model.resliceGeom.getPolys().getData(),
});
const options = {
points,
cellOffset: 0,
};
if (model.renderable.getSlabThickness() > 0.0) {
const n = model.resliceGeom.getPointData().getNormals();
Iif (!n) {
vtkErrorMacro('Slab mode requested without normals');
} else {
options.normals = n;
}
}
model.tris
.getCABO()
.createVBO(cells, 'polys', Representation.SURFACE, options);
}
model.VBOBuildString = vboString;
model.VBOBuildTime.modified();
};
publicAPI.updateShaders = (cellBO, ren, actor) => {
model.lastBoundBO = cellBO;
// has something changed that would require us to recreate the shader?
if (publicAPI.getNeedToRebuildShaders(cellBO, ren, actor)) {
const shaders = { Vertex: null, Fragment: null, Geometry: null };
publicAPI.buildShaders(shaders, ren, actor);
// compile and bind the program if needed
const newShader = model._openGLRenderWindow
.getShaderCache()
.readyShaderProgramArray(
shaders.Vertex,
shaders.Fragment,
shaders.Geometry
);
// if the shader changed reinitialize the VAO
if (newShader !== cellBO.getProgram()) {
cellBO.setProgram(newShader);
// reset the VAO as the shader has changed
cellBO.getVAO().releaseGraphicsResources();
}
cellBO.getShaderSourceTime().modified();
} else {
model._openGLRenderWindow
.getShaderCache()
.readyShaderProgram(cellBO.getProgram());
}
cellBO.getVAO().bind();
publicAPI.setMapperShaderParameters(cellBO, ren, actor);
publicAPI.setCameraShaderParameters(cellBO, ren, actor);
publicAPI.setPropertyShaderParameters(cellBO, ren, actor);
};
publicAPI.setMapperShaderParameters = (cellBO, ren, actor) => {
const program = cellBO.getProgram();
if (
cellBO.getCABO().getElementCount() &&
(model.VBOBuildTime.getMTime() >
cellBO.getAttributeUpdateTime().getMTime() ||
cellBO.getShaderSourceTime().getMTime() >
cellBO.getAttributeUpdateTime().getMTime())
) {
// Set the 3D texture
if (program.isUniformUsed('texture1')) {
program.setUniformi('texture1', model.openGLTexture.getTextureUnit());
}
// Set the plane vertex attributes
if (program.isAttributeUsed('vertexWC')) {
Iif (
!cellBO
.getVAO()
.addAttributeArray(
program,
cellBO.getCABO(),
'vertexWC',
cellBO.getCABO().getVertexOffset(),
cellBO.getCABO().getStride(),
model.context.FLOAT,
3,
model.context.FALSE
)
) {
vtkErrorMacro('Error setting vertexWC in shader VAO.');
}
}
// If we are doing slab mode, we need normals
if (program.isAttributeUsed('normalWC')) {
Iif (
!cellBO
.getVAO()
.addAttributeArray(
program,
cellBO.getCABO(),
'normalWC',
cellBO.getCABO().getNormalOffset(),
cellBO.getCABO().getStride(),
model.context.FLOAT,
3,
model.context.FALSE
)
) {
vtkErrorMacro('Error setting normalWC in shader VAO.');
}
}
if (program.isUniformUsed('slabThickness')) {
program.setUniformf(
'slabThickness',
model.renderable.getSlabThickness()
);
}
if (program.isUniformUsed('spacing')) {
program.setUniform3fv('spacing', model.currentInput.getSpacing());
}
if (program.isUniformUsed('slabType')) {
program.setUniformi('slabType', model.renderable.getSlabType());
}
if (program.isUniformUsed('slabType')) {
program.setUniformi('slabType', model.renderable.getSlabType());
}
if (program.isUniformUsed('slabTrapezoid')) {
program.setUniformi(
'slabTrapezoid',
model.renderable.getSlabTrapezoidIntegration()
);
}
const shiftScaleEnabled = cellBO.getCABO().getCoordShiftAndScaleEnabled();
const inverseShiftScaleMatrix = shiftScaleEnabled
? cellBO.getCABO().getInverseShiftAndScaleMatrix()
: null;
// Set the world->texture matrix
if (program.isUniformUsed('WCTCMatrix')) {
const image = model.currentInput;
const dim = image.getDimensions();
mat4.copy(model.tmpMat4, image.getIndexToWorld());
mat4.translate(model.tmpMat4, model.tmpMat4, [-0.5, -0.5, -0.5]);
mat4.scale(model.tmpMat4, model.tmpMat4, dim);
mat4.invert(model.tmpMat4, model.tmpMat4);
if (inverseShiftScaleMatrix) {
mat4.multiply(model.tmpMat4, model.tmpMat4, inverseShiftScaleMatrix);
}
program.setUniformMatrix('WCTCMatrix', model.tmpMat4);
}
if (program.isUniformUsed('vboScaling')) {
program.setUniform3fv(
'vboScaling',
cellBO.getCABO().getCoordScale() ?? [1, 1, 1]
);
}
cellBO.getAttributeUpdateTime().modified();
}
// Depth request
Iif (model.haveSeenDepthRequest) {
cellBO
.getProgram()
.setUniformi('depthRequest', model.renderDepth ? 1 : 0);
}
// handle coincident
if (cellBO.getProgram().isUniformUsed('coffset')) {
const cp = publicAPI.getCoincidentParameters(ren, actor);
cellBO.getProgram().setUniformf('coffset', cp.offset);
// cfactor isn't always used when coffset is.
if (cellBO.getProgram().isUniformUsed('cfactor')) {
cellBO.getProgram().setUniformf('cfactor', cp.factor);
}
}
};
publicAPI.setCameraShaderParameters = (cellBO, ren, actor) => {
// [WMVP]C == {world, model, view, projection} coordinates
// e.g. WCPC == world to projection coordinate transformation
const keyMats = model._openGLCamera.getKeyMatrices(ren);
const actMats = model._openGLImageSlice.getKeyMatrices();
const shiftScaleEnabled = cellBO.getCABO().getCoordShiftAndScaleEnabled();
const inverseShiftScaleMatrix = shiftScaleEnabled
? cellBO.getCABO().getInverseShiftAndScaleMatrix()
: null;
const program = cellBO.getProgram();
if (program.isUniformUsed('MCPCMatrix')) {
mat4.identity(model.tmpMat4);
program.setUniformMatrix(
'MCPCMatrix',
safeMatrixMultiply(
[keyMats.wcpc, actMats.mcwc, inverseShiftScaleMatrix],
mat4,
model.tmpMat4
)
);
}
Iif (program.isUniformUsed('MCVCMatrix')) {
mat4.identity(model.tmpMat4);
program.setUniformMatrix(
'MCVCMatrix',
safeMatrixMultiply(
[keyMats.wcvc, actMats.mcwc, inverseShiftScaleMatrix],
mat4,
model.tmpMat4
)
);
}
};
publicAPI.setPropertyShaderParameters = (cellBO, ren, actor) => {
const program = cellBO.getProgram();
const ppty = actor.getProperty();
const opacity = ppty.getOpacity();
program.setUniformf('opacity', opacity);
// Component mix
// Independent components: Mixed according to component weights
// Dependent components: Mixed using the following logic:
// - 2 comps => LA
// - 3 comps => RGB + opacity from pwf
// - 4 comps => RGBA
const numComp = model.openGLTexture.getComponents();
const iComps = ppty.getIndependentComponents();
if (iComps) {
for (let i = 0; i < numComp; ++i) {
program.setUniformf(`mix${i}`, ppty.getComponentWeight(i));
}
}
// Color opacity map
const volInfo = model.openGLTexture.getVolumeInfo();
// three levels of shift scale combined into one
// for performance in the fragment shader
for (let i = 0; i < numComp; i++) {
let cw = ppty.getColorWindow();
let cl = ppty.getColorLevel();
const target = iComps ? i : 0;
const cfun = ppty.getRGBTransferFunction(target);
Iif (cfun && ppty.getUseLookupTableScalarRange()) {
const cRange = cfun.getRange();
cw = cRange[1] - cRange[0];
cl = 0.5 * (cRange[1] + cRange[0]);
}
const scale = volInfo.scale[i] / cw;
const shift = (volInfo.offset[i] - cl) / cw + 0.5;
program.setUniformf(`cshift${i}`, shift);
program.setUniformf(`cscale${i}`, scale);
}
const texColorUnit = model.colorTexture.getTextureUnit();
program.setUniformi('colorTexture1', texColorUnit);
// pwf shift/scale
for (let i = 0; i < numComp; i++) {
let pwfScale = 1.0;
let pwfShift = 0.0;
const target = iComps ? i : 0;
const pwfun = ppty.getPiecewiseFunction(target);
if (pwfun) {
const pwfRange = pwfun.getRange();
const length = pwfRange[1] - pwfRange[0];
const mid = 0.5 * (pwfRange[0] + pwfRange[1]);
pwfScale = volInfo.scale[i] / length;
pwfShift = (volInfo.offset[i] - mid) / length + 0.5;
}
program.setUniformf(`pwfshift${i}`, pwfShift);
program.setUniformf(`pwfscale${i}`, pwfScale);
}
const texOpacityUnit = model.pwfTexture.getTextureUnit();
program.setUniformi('pwfTexture1', texOpacityUnit);
// Background color
program.setUniform4fv(
'backgroundColor',
model.renderable.getBackgroundColor()
);
};
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
// render pass shader replacement changed
const tNumComp = model.openGLTexture.getComponents();
const iComp = actor.getProperty().getIndependentComponents();
const slabTh = model.renderable.getSlabThickness();
const slabType = model.renderable.getSlabType();
const slabTrap = model.renderable.getSlabTrapezoidIntegration();
// has the render pass shader replacement changed? Two options
let needRebuild = false;
Iif (
(!model.currentRenderPass && model.lastRenderPassShaderReplacement) ||
(model.currentRenderPass &&
model.currentRenderPass.getShaderReplacement() !==
model.lastRenderPassShaderReplacement)
) {
needRebuild = true;
}
if (
needRebuild ||
model.lastHaveSeenDepthRequest !== model.haveSeenDepthRequest ||
cellBO.getProgram()?.getHandle() === 0 ||
model.lastTextureComponents !== tNumComp ||
model.lastIndependentComponents !== iComp ||
model.lastSlabThickness !== slabTh ||
model.lastSlabType !== slabType ||
model.lastSlabTrapezoidIntegration !== slabTrap
) {
model.lastHaveSeenDepthRequest = model.haveSeenDepthRequest;
model.lastTextureComponents = tNumComp;
model.lastIndependentComponents = iComp;
model.lastSlabThickness = slabTh;
model.lastSlabType = slabType;
model.lastSlabTrapezoidIntegration = slabTrap;
return true;
}
return false;
};
publicAPI.getShaderTemplate = (shaders, ren, actor) => {
shaders.Vertex = vtkImageResliceMapperVS;
shaders.Fragment = vtkImageResliceMapperFS;
shaders.Geometry = '';
};
publicAPI.replaceShaderValues = (shaders, ren, actor) => {
publicAPI.replaceShaderTCoord(shaders, ren, actor);
publicAPI.replaceShaderPositionVC(shaders, ren, actor);
Iif (model.haveSeenDepthRequest) {
let FSSource = shaders.Fragment;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::ZBuffer::Dec',
'uniform int depthRequest;'
).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::ZBuffer::Impl', [
'if (depthRequest == 1) {',
'float iz = floor(gl_FragCoord.z*65535.0 + 0.1);',
'float rf = floor(iz/256.0)/255.0;',
'float gf = mod(iz,256.0)/255.0;',
'gl_FragData[0] = vec4(rf, gf, 0.0, 1.0); }',
]).result;
shaders.Fragment = FSSource;
}
publicAPI.replaceShaderCoincidentOffset(shaders, ren, actor);
};
publicAPI.replaceShaderTCoord = (shaders, ren, actor) => {
let VSSource = shaders.Vertex;
const GSSource = shaders.Geometry;
let FSSource = shaders.Fragment;
const tcoordVSDec = ['uniform mat4 WCTCMatrix;', 'out vec3 fragTexCoord;'];
const slabThickness = model.renderable.getSlabThickness();
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::TCoord::Dec',
tcoordVSDec
).result;
const tcoordVSImpl = ['fragTexCoord = (WCTCMatrix * vertexWC).xyz;'];
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::TCoord::Impl',
tcoordVSImpl
).result;
const tNumComp = model.openGLTexture.getComponents();
const iComps = actor.getProperty().getIndependentComponents();
let tcoordFSDec = [
'in vec3 fragTexCoord;',
'uniform highp sampler3D texture1;',
'uniform mat4 WCTCMatrix;',
// color shift and scale
'uniform float cshift0;',
'uniform float cscale0;',
// pwf shift and scale
'uniform float pwfshift0;',
'uniform float pwfscale0;',
// color and pwf textures
'uniform sampler2D colorTexture1;',
'uniform sampler2D pwfTexture1;',
// opacity
'uniform float opacity;',
// background color
'uniform vec4 backgroundColor;',
];
if (iComps) {
for (let comp = 1; comp < tNumComp; comp++) {
tcoordFSDec = tcoordFSDec.concat([
// color shift and scale
`uniform float cshift${comp};`,
`uniform float cscale${comp};`,
// weighting shift and scale
`uniform float pwfshift${comp};`,
`uniform float pwfscale${comp};`,
]);
}
// the heights defined below are the locations
// for the up to four components of the tfuns
// the tfuns have a height of 2XnumComps pixels so the
// values are computed to hit the middle of the two rows
// for that component
switch (tNumComp) {
case 1:
tcoordFSDec = tcoordFSDec.concat([
'uniform float mix0;',
'#define height0 0.5',
]);
break;
case 2:
tcoordFSDec = tcoordFSDec.concat([
'uniform float mix0;',
'uniform float mix1;',
'#define height0 0.25',
'#define height1 0.75',
]);
break;
case 3:
tcoordFSDec = tcoordFSDec.concat([
'uniform float mix0;',
'uniform float mix1;',
'uniform float mix2;',
'#define height0 0.17',
'#define height1 0.5',
'#define height2 0.83',
]);
break;
case 4:
tcoordFSDec = tcoordFSDec.concat([
'uniform float mix0;',
'uniform float mix1;',
'uniform float mix2;',
'uniform float mix3;',
'#define height0 0.125',
'#define height1 0.375',
'#define height2 0.625',
'#define height3 0.875',
]);
break;
default:
vtkErrorMacro('Unsupported number of independent coordinates.');
}
}
if (slabThickness > 0.0) {
tcoordFSDec = tcoordFSDec.concat([
'uniform vec3 spacing;',
'uniform float slabThickness;',
'uniform int slabType;',
'uniform int slabTrapezoid;',
'uniform vec3 vboScaling;',
]);
tcoordFSDec = tcoordFSDec.concat([
'vec4 compositeValue(vec4 currVal, vec4 valToComp, int trapezoid)',
'{',
' vec4 retVal = vec4(1.0);',
' if (slabType == 0) // min',
' {',
' retVal = min(currVal, valToComp);',
' }',
' else if (slabType == 1) // max',
' {',
' retVal = max(currVal, valToComp);',
' }',
' else if (slabType == 3) // sum',
' {',
' retVal = currVal + (trapezoid > 0 ? 0.5 * valToComp : valToComp); ',
' }',
' else // mean',
' {',
' retVal = currVal + (trapezoid > 0 ? 0.5 * valToComp : valToComp); ',
' }',
' return retVal;',
'}',
]);
}
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::TCoord::Dec',
tcoordFSDec
).result;
let tcoordFSImpl = [
'if (any(greaterThan(fragTexCoord, vec3(1.0))) || any(lessThan(fragTexCoord, vec3(0.0))))',
'{',
' // set the background color and exit',
' gl_FragData[0] = backgroundColor;',
' return;',
'}',
'vec4 tvalue = texture(texture1, fragTexCoord);',
];
if (slabThickness > 0.0) {
tcoordFSImpl = tcoordFSImpl.concat([
'// Get the first and last samples',
'int numSlices = 1;',
'float scaling = min(min(spacing.x, spacing.y), spacing.z) * 0.5;',
'vec3 normalxspacing = scaling * normalWCVSOutput;',
'float distTraveled = length(normalxspacing);',
'int trapezoid = 0;',
'while (distTraveled < slabThickness * 0.5)',
'{',
' distTraveled += length(normalxspacing);',
' float fnumSlices = float(numSlices);',
' if (distTraveled > slabThickness * 0.5)',
' {',
' // Before stepping outside the slab, sample at the boundaries',
' normalxspacing = normalWCVSOutput * slabThickness * 0.5 / fnumSlices;',
' trapezoid = slabTrapezoid;',
' }',
' vec3 fragTCoordNeg = (WCTCMatrix * vec4(vertexWCVSOutput.xyz - fnumSlices * normalxspacing * vboScaling, 1.0)).xyz;',
' if (!any(greaterThan(fragTCoordNeg, vec3(1.0))) && !any(lessThan(fragTCoordNeg, vec3(0.0))))',
' {',
' vec4 newVal = texture(texture1, fragTCoordNeg);',
' tvalue = compositeValue(tvalue, newVal, trapezoid);',
' numSlices += 1;',
' }',
' vec3 fragTCoordPos = (WCTCMatrix * vec4(vertexWCVSOutput.xyz + fnumSlices * normalxspacing * vboScaling, 1.0)).xyz;',
' if (!any(greaterThan(fragTCoordNeg, vec3(1.0))) && !any(lessThan(fragTCoordNeg, vec3(0.0))))',
' {',
' vec4 newVal = texture(texture1, fragTCoordPos);',
' tvalue = compositeValue(tvalue, newVal, trapezoid);',
' numSlices += 1;',
' }',
'}',
'// Finally, if slab type is *mean*, divide the sum by the numSlices',
'if (slabType == 2)',
'{',
' tvalue = tvalue / float(numSlices);',
'}',
]);
}
if (iComps) {
const rgba = ['r', 'g', 'b', 'a'];
for (let comp = 0; comp < tNumComp; ++comp) {
tcoordFSImpl = tcoordFSImpl.concat([
`vec3 tcolor${comp} = mix${comp} * texture2D(colorTexture1, vec2(tvalue.${rgba[comp]} * cscale${comp} + cshift${comp}, height${comp})).rgb;`,
`float compWeight${comp} = mix${comp} * texture2D(pwfTexture1, vec2(tvalue.${rgba[comp]} * pwfscale${comp} + pwfshift${comp}, height${comp})).r;`,
]);
}
switch (tNumComp) {
case 1:
tcoordFSImpl = tcoordFSImpl.concat([
'gl_FragData[0] = vec4(tcolor0.rgb, compWeight0 * opacity);',
]);
break;
case 2:
tcoordFSImpl = tcoordFSImpl.concat([
'float weightSum = compWeight0 + compWeight1;',
'gl_FragData[0] = vec4(vec3((tcolor0.rgb * (compWeight0 / weightSum)) + (tcolor1.rgb * (compWeight1 / weightSum))), opacity);',
]);
break;
case 3:
tcoordFSImpl = tcoordFSImpl.concat([
'float weightSum = compWeight0 + compWeight1 + compWeight2;',
'gl_FragData[0] = vec4(vec3((tcolor0.rgb * (compWeight0 / weightSum)) + (tcolor1.rgb * (compWeight1 / weightSum)) + (tcolor2.rgb * (compWeight2 / weightSum))), opacity);',
]);
break;
case 4:
tcoordFSImpl = tcoordFSImpl.concat([
'float weightSum = compWeight0 + compWeight1 + compWeight2 + compWeight3;',
'gl_FragData[0] = vec4(vec3((tcolor0.rgb * (compWeight0 / weightSum)) + (tcolor1.rgb * (compWeight1 / weightSum)) + (tcolor2.rgb * (compWeight2 / weightSum)) + (tcolor3.rgb * (compWeight3 / weightSum))), opacity);',
]);
break;
default:
vtkErrorMacro('Unsupported number of independent coordinates.');
}
} else {
// dependent components
switch (tNumComp) {
case 1:
tcoordFSImpl = tcoordFSImpl.concat([
'// Dependent components',
'float intensity = tvalue.r;',
'vec3 tcolor = texture2D(colorTexture1, vec2(intensity * cscale0 + cshift0, 0.5)).rgb;',
'float scalarOpacity = texture2D(pwfTexture1, vec2(intensity * pwfscale0 + pwfshift0, 0.5)).r;',
'gl_FragData[0] = vec4(tcolor, scalarOpacity * opacity);',
]);
break;
case 2:
tcoordFSImpl = tcoordFSImpl.concat([
'float intensity = tvalue.r*cscale0 + cshift0;',
'gl_FragData[0] = vec4(texture2D(colorTexture1, vec2(intensity, 0.5)).rgb, pwfscale0*tvalue.g + pwfshift0);',
]);
break;
case 3:
tcoordFSImpl = tcoordFSImpl.concat([
'vec4 tcolor = cscale0*tvalue + cshift0;',
'gl_FragData[0] = vec4(texture2D(colorTexture1, vec2(tcolor.r,0.5)).r,',
' texture2D(colorTexture1, vec2(tcolor.g,0.5)).r,',
' texture2D(colorTexture1, vec2(tcolor.b,0.5)).r, opacity);',
]);
break;
default:
tcoordFSImpl = tcoordFSImpl.concat([
'vec4 tcolor = cscale0*tvalue + cshift0;',
'gl_FragData[0] = vec4(texture2D(colorTexture1, vec2(tcolor.r,0.5)).r,',
' texture2D(colorTexture1, vec2(tcolor.g,0.5)).r,',
' texture2D(colorTexture1, vec2(tcolor.b,0.5)).r, tcolor.a);',
]);
}
}
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::TCoord::Impl',
tcoordFSImpl
).result;
shaders.Vertex = VSSource;
shaders.Fragment = FSSource;
shaders.Geometry = GSSource;
};
publicAPI.replaceShaderPositionVC = (shaders, ren, actor) => {
let VSSource = shaders.Vertex;
const GSSource = shaders.Geometry;
let FSSource = shaders.Fragment;
const slabThickness = model.renderable.getSlabThickness();
let posVCVSDec = ['attribute vec4 vertexWC;'];
// Add a unique hash to the shader to ensure that the shader program is unique to this mapper.
posVCVSDec = posVCVSDec.concat([
`//${publicAPI.getMTime()}${model.resliceGeomUpdateString}`,
]);
if (slabThickness > 0.0) {
posVCVSDec = posVCVSDec.concat([
'attribute vec3 normalWC;',
'varying vec3 normalWCVSOutput;',
'varying vec4 vertexWCVSOutput;',
]);
}
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::PositionVC::Dec',
posVCVSDec
).result;
let posVCVSImpl = ['gl_Position = MCPCMatrix * vertexWC;'];
if (slabThickness > 0.0) {
posVCVSImpl = posVCVSImpl.concat([
'normalWCVSOutput = normalWC;',
'vertexWCVSOutput = vertexWC;',
]);
}
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::PositionVC::Impl',
posVCVSImpl
).result;
VSSource = vtkShaderProgram.substitute(VSSource, '//VTK::Camera::Dec', [
'uniform mat4 MCPCMatrix;',
'uniform mat4 MCVCMatrix;',
]).result;
let posVCFSDec = [];
if (slabThickness > 0.0) {
posVCFSDec = posVCFSDec.concat([
'varying vec3 normalWCVSOutput;',
'varying vec4 vertexWCVSOutput;',
]);
}
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::PositionVC::Dec',
posVCFSDec
).result;
shaders.Vertex = VSSource;
shaders.Geometry = GSSource;
shaders.Fragment = FSSource;
};
/**
* Returns true if the normal is almost axis aligned.
* Has a side effect to normalize the vector.
*/
function isVectorAxisAligned(n) {
vtkMath.normalize(n);
const tmpN = [0, 0, 0];
for (let i = 0; i < 3; ++i) {
vec3.zero(tmpN);
tmpN[i] = 1.0;
const dotP = vtkMath.dot(n, tmpN);
if (dotP < -0.999999 || dotP > 0.999999) {
return [true, i];
}
}
return [false, 2];
}
publicAPI.updateResliceGeometry = () => {
let resGeomString = '';
const image = model.currentInput;
const imageBounds = image?.getBounds();
// Orthogonal slicing by default
let orthoSlicing = true;
let orthoAxis = 2;
const slicePD = model.renderable.getSlicePolyData();
const slicePlane = model.renderable.getSlicePlane();
if (slicePD) {
resGeomString = resGeomString.concat(`PolyData${slicePD.getMTime()}`);
} else if (slicePlane) {
resGeomString = resGeomString.concat(`Plane${slicePlane.getMTime()}`);
// Compute a world-to-image-orientation matrix.
const w2io = mat3.create();
if (image) {
resGeomString = resGeomString.concat(`Image${image.getMTime()}`);
// Ignore the translation component since we are
// using it on vectors rather than positions.
mat3.set(w2io, ...image.getDirection());
mat3.invert(w2io, w2io);
}
// Check to see if we can bypass oblique slicing related bounds computation
// transform the cutting plane normal to image local coords
const imageLocalNormal = [...slicePlane.getNormal()];
vec3.transformMat3(imageLocalNormal, imageLocalNormal, w2io);
[orthoSlicing, orthoAxis] = isVectorAxisAligned(imageLocalNormal);
} else E{
// Create a default slice plane here
const plane = vtkPlane.newInstance();
plane.setNormal(0, 0, 1);
let bds = [0, 1, 0, 1, 0, 1];
if (image) {
bds = imageBounds;
}
plane.setOrigin(bds[0], bds[2], 0.5 * (bds[5] + bds[4]));
model.renderable.setSlicePlane(plane);
resGeomString = resGeomString.concat(`Plane${slicePlane?.getMTime()}`);
if (image) {
resGeomString = resGeomString.concat(`Image${image.getMTime()}`);
}
}
if (!model.resliceGeom || model.resliceGeomUpdateString !== resGeomString) {
if (slicePD) {
if (!model.resliceGeom) {
model.resliceGeom = vtkPolyData.newInstance();
}
model.resliceGeom.getPoints().setData(slicePD.getPoints().getData(), 3);
model.resliceGeom.getPolys().setData(slicePD.getPolys().getData(), 1);
model.resliceGeom
.getPointData()
.setNormals(slicePD.getPointData().getNormals());
} else if (slicePlane) {
if (!orthoSlicing) {
model.outlineFilter.setInputData(image);
model.cutter.setInputConnection(model.outlineFilter.getOutputPort());
model.cutter.setCutFunction(slicePlane);
model.lineToSurfaceFilter.setInputConnection(
model.cutter.getOutputPort()
);
model.lineToSurfaceFilter.update();
if (!model.resliceGeom) {
model.resliceGeom = vtkPolyData.newInstance();
}
const planePD = model.lineToSurfaceFilter.getOutputData();
model.resliceGeom
.getPoints()
.setData(planePD.getPoints().getData(), 3);
model.resliceGeom.getPolys().setData(planePD.getPolys().getData(), 1);
model.resliceGeom
.getPointData()
.setNormals(planePD.getPointData().getNormals());
// The above method does not generate point normals
// Set it manually here.
const n = slicePlane.getNormal();
const npts = model.resliceGeom.getNumberOfPoints();
vtkMath.normalize(n);
const normalsData = new Float32Array(npts * 3);
for (let i = 0; i < npts; ++i) {
normalsData[3 * i] = n[0];
normalsData[3 * i + 1] = n[1];
normalsData[3 * i + 2] = n[2];
}
const normals = vtkDataArray.newInstance({
numberOfComponents: 3,
values: normalsData,
name: 'Normals',
});
model.resliceGeom.getPointData().setNormals(normals);
} else {
// Since the image-local normal is axis-aligned, we
// can quickly construct the cutting plane using indexToWorld transforms.
const ptsArray = new Float32Array(12);
const indexSpacePlaneOrigin = image.worldToIndex(
slicePlane.getOrigin(),
[0, 0, 0]
);
const otherAxes = [(orthoAxis + 1) % 3, (orthoAxis + 2) % 3].sort();
const ext = image.getSpatialExtent();
let ptIdx = 0;
for (let i = 0; i < 2; ++i) {
for (let j = 0; j < 2; ++j) {
ptsArray[ptIdx + orthoAxis] = indexSpacePlaneOrigin[orthoAxis];
ptsArray[ptIdx + otherAxes[0]] = ext[2 * otherAxes[0] + j];
ptsArray[ptIdx + otherAxes[1]] = ext[2 * otherAxes[1] + i];
ptIdx += 3;
}
}
model.transform.setMatrix(image.getIndexToWorld());
model.transform.transformPoints(ptsArray, ptsArray);
const cellArray = new Uint16Array(8);
cellArray[0] = 3;
cellArray[1] = 0;
cellArray[2] = 1;
cellArray[3] = 3;
cellArray[4] = 3;
cellArray[5] = 0;
cellArray[6] = 3;
cellArray[7] = 2;
const n = slicePlane.getNormal();
vtkMath.normalize(n);
const normalsData = new Float32Array(12);
for (let i = 0; i < 4; ++i) {
normalsData[3 * i] = n[0];
normalsData[3 * i + 1] = n[1];
normalsData[3 * i + 2] = n[2];
}
if (!model.resliceGeom) {
model.resliceGeom = vtkPolyData.newInstance();
}
model.resliceGeom.getPoints().setData(ptsArray, 3);
model.resliceGeom.getPolys().setData(cellArray, 1);
const normals = vtkDataArray.newInstance({
numberOfComponents: 3,
values: normalsData,
name: 'Normals',
});
model.resliceGeom.getPointData().setNormals(normals);
}
} else E{
vtkErrorMacro(
'Something went wrong.',
'A default slice plane should have been created in the beginning of',
'updateResliceGeometry.'
);
}
model.resliceGeomUpdateString = resGeomString;
model.resliceGeom?.modified();
}
};
publicAPI.setOpenGLTexture = (oglTex) => {
Iif (oglTex) {
model.openGLTexture = oglTex;
model._externalOpenGLTexture = true;
}
};
publicAPI.delete = macro.chain(() => {
if (model._openGLRenderWindow) {
unregisterGraphicsResources(model._openGLRenderWindow);
}
}, publicAPI.delete);
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
VBOBuildTime: {},
VBOBuildString: null,
haveSeenDepthRequest: false,
lastHaveSeenDepthRequest: false,
lastIndependentComponents: false,
lastTextureComponents: 0,
lastSlabThickness: 0,
lastSlabTrapezoidIntegration: 0,
lastSlabType: -1,
openGLTexture: null,
colorTextureString: null,
pwfTextureString: null,
resliceGeom: null,
resliceGeomUpdateString: null,
tris: null,
colorTexture: null,
pwfTexture: null,
_externalOpenGLTexture: false,
// _scalars: null,
// _colorTransferFunc: null,
// _pwFunc: 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.tris = vtkHelper.newInstance();
model.openGLTexture = null;
model.colorTexture = null;
model.pwfTexture = null;
model.VBOBuildTime = {};
macro.obj(model.VBOBuildTime);
model.tmpMat4 = mat4.identity(new Float64Array(16));
// Implicit plane to polydata related cache:
model.outlineFilter = vtkImageDataOutlineFilter.newInstance();
model.outlineFilter.setGenerateFaces(true);
model.outlineFilter.setGenerateLines(false);
model.cubePolyData = vtkPolyData.newInstance();
model.cutter = vtkCutter.newInstance();
model.lineToSurfaceFilter = vtkClosedPolyLineToSurfaceFilter.newInstance();
model.transform = vtkTransform.newInstance();
macro.get(publicAPI, model, ['openGLTexture']);
// Object methods
vtkOpenGLImageResliceMapper(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(
extend,
'vtkOpenGLImageResliceMapper'
);
// ----------------------------------------------------------------------------
export default { newInstance, extend };
// Register ourself to OpenGL backend if imported
registerOverride('vtkImageResliceMapper', newInstance);
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