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import DeepEqual from 'fast-deep-equal';
import { vec3, mat3, mat4 } from 'gl-matrix';
// import vtkBoundingBox from 'vtk.js/Sources/Common/DataModel/BoundingBox';
import vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
import { VtkDataTypes } from 'vtk.js/Sources/Common/Core/DataArray/Constants';
import vtkHelper from 'vtk.js/Sources/Rendering/OpenGL/Helper';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import vtkOpenGLFramebuffer from 'vtk.js/Sources/Rendering/OpenGL/Framebuffer';
import vtkOpenGLTexture from 'vtk.js/Sources/Rendering/OpenGL/Texture';
import vtkReplacementShaderMapper from 'vtk.js/Sources/Rendering/OpenGL/ReplacementShaderMapper';
import vtkShaderProgram from 'vtk.js/Sources/Rendering/OpenGL/ShaderProgram';
import vtkVertexArrayObject from 'vtk.js/Sources/Rendering/OpenGL/VertexArrayObject';
import vtkViewNode from 'vtk.js/Sources/Rendering/SceneGraph/ViewNode';
import { Representation } from 'vtk.js/Sources/Rendering/Core/Property/Constants';
import {
Wrap,
Filter,
} from 'vtk.js/Sources/Rendering/OpenGL/Texture/Constants';
import {
InterpolationType,
OpacityMode,
ColorMixPreset,
} from 'vtk.js/Sources/Rendering/Core/VolumeProperty/Constants';
import { BlendMode } from 'vtk.js/Sources/Rendering/Core/VolumeMapper/Constants';
import vtkVolumeVS from 'vtk.js/Sources/Rendering/OpenGL/glsl/vtkVolumeVS.glsl';
import vtkVolumeFS from 'vtk.js/Sources/Rendering/OpenGL/glsl/vtkVolumeFS.glsl';
import { registerOverride } from 'vtk.js/Sources/Rendering/OpenGL/ViewNodeFactory';
const { vtkWarningMacro, vtkErrorMacro } = macro;
// ----------------------------------------------------------------------------
// helper methods
// ----------------------------------------------------------------------------
function computeFnToString(pwfun, useIComps, numberOfComponents) {
return pwfun ? `${pwfun.getMTime()}-${useIComps}-${numberOfComponents}` : '0';
}
function getColorCodeFromPreset(colorMixPreset) {
switch (colorMixPreset) {
case ColorMixPreset.CUSTOM:
return '//VTK::CustomColorMix';
case ColorMixPreset.ADDITIVE:
return `
// compute normals
mat4 normalMat = computeMat4Normal(posIS, tValue, tstep);
#if (vtkLightComplexity > 0) && defined(vtkComputeNormalFromOpacity)
vec3 scalarInterp0[2];
vec4 normalLight0 = computeNormalForDensity(posIS, tstep, scalarInterp0, 0);
scalarInterp0[0] = scalarInterp0[0] * oscale0 + oshift0;
scalarInterp0[1] = scalarInterp0[1] * oscale0 + oshift0;
normalLight0 = computeDensityNormal(scalarInterp0, height0, 1.0);
vec3 scalarInterp1[2];
vec4 normalLight1 = computeNormalForDensity(posIS, tstep, scalarInterp1, 1);
scalarInterp1[0] = scalarInterp1[0] * oscale1 + oshift1;
scalarInterp1[1] = scalarInterp1[1] * oscale1 + oshift1;
normalLight1 = computeDensityNormal(scalarInterp1, height1, 1.0);
#else
vec4 normalLight0 = normalMat[0];
vec4 normalLight1 = normalMat[1];
#endif
// compute opacities
float opacity0 = pwfValue0;
float opacity1 = pwfValue1;
#ifdef vtkGradientOpacityOn
float gof0 = computeGradientOpacityFactor(normalMat[0].a, goscale0, goshift0, gomin0, gomax0);
opacity0 *= gof0;
float gof1 = computeGradientOpacityFactor(normalMat[1].a, goscale1, goshift1, gomin1, gomax1);
opacity1 *= gof1;
#endif
float opacitySum = opacity0 + opacity1;
if (opacitySum <= 0.0) {
return vec4(0.0);
}
// mix the colors and opacities
tColor0 = applyAllLightning(tColor0, opacity0, posIS, normalLight0);
tColor1 = applyAllLightning(tColor1, opacity1, posIS, normalLight1);
vec3 mixedColor = (opacity0 * tColor0 + opacity1 * tColor1) / opacitySum;
return vec4(mixedColor, min(1.0, opacitySum));
`;
case ColorMixPreset.COLORIZE:
return `
// compute normals
mat4 normalMat = computeMat4Normal(posIS, tValue, tstep);
#if (vtkLightComplexity > 0) && defined(vtkComputeNormalFromOpacity)
vec3 scalarInterp0[2];
vec4 normalLight0 = computeNormalForDensity(posIS, tstep, scalarInterp0, 0);
scalarInterp0[0] = scalarInterp0[0] * oscale0 + oshift0;
scalarInterp0[1] = scalarInterp0[1] * oscale0 + oshift0;
normalLight0 = computeDensityNormal(scalarInterp0, height0, 1.0);
#else
vec4 normalLight0 = normalMat[0];
#endif
// compute opacities
float opacity0 = pwfValue0;
#ifdef vtkGradientOpacityOn
float gof0 = computeGradientOpacityFactor(normalMat[0].a, goscale0, goshift0, gomin0, gomax0);
opacity0 *= gof0;
#endif
// mix the colors and opacities
vec3 color = tColor0 * mix(vec3(1.0), tColor1, pwfValue1);
color = applyAllLightning(color, opacity0, posIS, normalLight0);
return vec4(color, opacity0);
`;
default:
return null;
}
}
// ----------------------------------------------------------------------------
// vtkOpenGLVolumeMapper methods
// ----------------------------------------------------------------------------
function vtkOpenGLVolumeMapper(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkOpenGLVolumeMapper');
publicAPI.buildPass = () => {
model.zBufferTexture = null;
};
// ohh someone is doing a zbuffer pass, use that for
// intermixed volume rendering
publicAPI.zBufferPass = (prepass, renderPass) => {
if (prepass) {
const zbt = renderPass.getZBufferTexture();
if (zbt !== model.zBufferTexture) {
model.zBufferTexture = zbt;
}
}
};
publicAPI.opaqueZBufferPass = (prepass, renderPass) =>
publicAPI.zBufferPass(prepass, renderPass);
// Renders myself
publicAPI.volumePass = (prepass, renderPass) => {
if (prepass) {
model._openGLRenderWindow = publicAPI.getFirstAncestorOfType(
'vtkOpenGLRenderWindow'
);
model.context = model._openGLRenderWindow.getContext();
model.tris.setOpenGLRenderWindow(model._openGLRenderWindow);
model.jitterTexture.setOpenGLRenderWindow(model._openGLRenderWindow);
model.framebuffer.setOpenGLRenderWindow(model._openGLRenderWindow);
// Per Component?
model.scalarTexture.setOpenGLRenderWindow(model._openGLRenderWindow);
model.colorTexture.setOpenGLRenderWindow(model._openGLRenderWindow);
model.opacityTexture.setOpenGLRenderWindow(model._openGLRenderWindow);
model.labelOutlineThicknessTexture.setOpenGLRenderWindow(
model._openGLRenderWindow
);
model.openGLVolume = publicAPI.getFirstAncestorOfType('vtkOpenGLVolume');
const actor = model.openGLVolume.getRenderable();
model._openGLRenderer =
publicAPI.getFirstAncestorOfType('vtkOpenGLRenderer');
const ren = model._openGLRenderer.getRenderable();
model.openGLCamera = model._openGLRenderer.getViewNodeFor(
ren.getActiveCamera()
);
publicAPI.renderPiece(ren, actor);
}
};
publicAPI.getShaderTemplate = (shaders, ren, actor) => {
shaders.Vertex = vtkVolumeVS;
shaders.Fragment = vtkVolumeFS;
shaders.Geometry = '';
};
publicAPI.useIndependentComponents = (actorProperty) => {
const iComps = actorProperty.getIndependentComponents();
const image = model.currentInput;
const numComp = image
?.getPointData()
?.getScalars()
?.getNumberOfComponents();
const colorMixPreset = actorProperty.getColorMixPreset();
return (iComps && numComp >= 2) || !!colorMixPreset;
};
publicAPI.replaceShaderValues = (shaders, ren, actor) => {
const actorProps = actor.getProperty();
let FSSource = shaders.Fragment;
// define some values in the shader
const iType = actorProps.getInterpolationType();
if (iType === InterpolationType.LINEAR) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::TrilinearOn',
'#define vtkTrilinearOn'
).result;
}
const vtkImageLabelOutline = actorProps.getUseLabelOutline();
Iif (vtkImageLabelOutline === true) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::ImageLabelOutlineOn',
'#define vtkImageLabelOutlineOn'
).result;
}
const numComp = model.scalarTexture.getComponents();
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::NumComponents',
`#define vtkNumComponents ${numComp}`
).result;
const useIndependentComps = publicAPI.useIndependentComponents(actorProps);
if (useIndependentComps) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::IndependentComponentsOn',
'#define UseIndependentComponents'
).result;
}
// Define any proportional components
const proportionalComponents = [];
const forceNearestComponents = [];
for (let nc = 0; nc < numComp; nc++) {
if (actorProps.getOpacityMode(nc) === OpacityMode.PROPORTIONAL) {
proportionalComponents.push(`#define vtkComponent${nc}Proportional`);
}
Iif (actorProps.getForceNearestInterpolation(nc)) {
forceNearestComponents.push(`#define vtkComponent${nc}ForceNearest`);
}
}
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::vtkProportionalComponents',
proportionalComponents.join('\n')
).result;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::vtkForceNearestComponents',
forceNearestComponents.join('\n')
).result;
const colorMixPreset = actorProps.getColorMixPreset();
const colorMixCode = getColorCodeFromPreset(colorMixPreset);
if (colorMixCode) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::CustomComponentsColorMixOn',
'#define vtkCustomComponentsColorMix'
).result;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::CustomComponentsColorMix::Impl',
colorMixCode
).result;
}
// WebGL only supports loops over constants
// and does not support while loops so we
// have to hard code how many steps/samples to take
// We do a break so most systems will gracefully
// early terminate, but it is always possible
// a system will execute every step regardless
const ext = model.currentInput.getSpatialExtent();
const spc = model.currentInput.getSpacing();
const vsize = new Float64Array(3);
vec3.set(
vsize,
(ext[1] - ext[0]) * spc[0],
(ext[3] - ext[2]) * spc[1],
(ext[5] - ext[4]) * spc[2]
);
const maxSamples =
vec3.length(vsize) / publicAPI.getCurrentSampleDistance(ren);
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::MaximumSamplesValue',
`${Math.ceil(maxSamples)}`
).result;
// set light complexity
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::LightComplexity',
`#define vtkLightComplexity ${model.lightComplexity}`
).result;
// set shadow blending flag
if (model.lightComplexity > 0) {
if (model.renderable.getVolumetricScatteringBlending() > 0.0) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::VolumeShadowOn',
`#define VolumeShadowOn`
).result;
}
if (model.renderable.getVolumetricScatteringBlending() < 1.0) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::SurfaceShadowOn',
`#define SurfaceShadowOn`
).result;
}
Iif (
model.renderable.getLocalAmbientOcclusion() &&
actorProps.getAmbient() > 0.0
) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::localAmbientOcclusionOn',
`#define localAmbientOcclusionOn`
).result;
}
}
// if using gradient opacity define that
const numIComps = useIndependentComps ? numComp : 1;
model.gopacity = false;
for (let nc = 0; !model.gopacity && nc < numIComps; ++nc) {
model.gopacity ||= actorProps.getUseGradientOpacity(nc);
}
if (model.gopacity) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::GradientOpacityOn',
'#define vtkGradientOpacityOn'
).result;
}
// set normal from density
if (model.renderable.getComputeNormalFromOpacity()) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::vtkComputeNormalFromOpacity',
`#define vtkComputeNormalFromOpacity`
).result;
}
// if we have a ztexture then declare it and use it
if (model.zBufferTexture !== null) {
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::ZBuffer::Dec', [
'uniform sampler2D zBufferTexture;',
'uniform float vpZWidth;',
'uniform float vpZHeight;',
]).result;
FSSource = vtkShaderProgram.substitute(FSSource, '//VTK::ZBuffer::Impl', [
'vec4 depthVec = texture2D(zBufferTexture, vec2(gl_FragCoord.x / vpZWidth, gl_FragCoord.y/vpZHeight));',
'float zdepth = (depthVec.r*256.0 + depthVec.g)/257.0;',
'zdepth = zdepth * 2.0 - 1.0;',
'if (cameraParallel == 0) {',
'zdepth = -2.0 * camFar * camNear / (zdepth*(camFar-camNear)-(camFar+camNear)) - camNear;}',
'else {',
'zdepth = (zdepth + 1.0) * 0.5 * (camFar - camNear);}\n',
'zdepth = -zdepth/rayDir.z;',
'dists.y = min(zdepth,dists.y);',
]).result;
}
// Set the BlendMode approach
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::BlendMode',
`${model.renderable.getBlendMode()}`
).result;
shaders.Fragment = FSSource;
publicAPI.replaceShaderLight(shaders, ren, actor);
publicAPI.replaceShaderClippingPlane(shaders, ren, actor);
};
publicAPI.replaceShaderLight = (shaders, ren, actor) => {
if (model.lightComplexity === 0) {
return;
}
let FSSource = shaders.Fragment;
// check for shadow maps - not implemented yet, skip
// const shadowFactor = '';
// to-do: single out the case when complexity = 1
// only account for lights that are switched on
let lightNum = 0;
ren.getLights().forEach((light) => {
if (light.getSwitch()) {
lightNum += 1;
}
});
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::Light::Dec',
[
`uniform int lightNum;`,
`uniform bool twoSidedLighting;`,
`uniform vec3 lightColor[${lightNum}];`,
`uniform vec3 lightDirectionVC[${lightNum}]; // normalized`,
`uniform vec3 lightHalfAngleVC[${lightNum}];`,
'//VTK::Light::Dec',
],
false
).result;
// support any number of lights
if (model.lightComplexity === 3) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::Light::Dec',
[
`uniform vec3 lightPositionVC[${lightNum}];`,
`uniform vec3 lightAttenuation[${lightNum}];`,
`uniform float lightConeAngle[${lightNum}];`,
`uniform float lightExponent[${lightNum}];`,
`uniform int lightPositional[${lightNum}];`,
],
false
).result;
}
if (model.renderable.getVolumetricScatteringBlending() > 0.0) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::VolumeShadow::Dec',
[
`uniform float volumetricScatteringBlending;`,
`uniform float giReach;`,
`uniform float volumeShadowSamplingDistFactor;`,
`uniform float anisotropy;`,
`uniform float anisotropy2;`,
],
false
).result;
}
Iif (
model.renderable.getLocalAmbientOcclusion() &&
actor.getProperty().getAmbient() > 0.0
) {
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::LAO::Dec',
[
`uniform int kernelRadius;`,
`uniform vec2 kernelSample[${model.renderable.getLAOKernelRadius()}];`,
`uniform int kernelSize;`,
],
false
).result;
}
shaders.Fragment = FSSource;
};
publicAPI.replaceShaderClippingPlane = (shaders, ren, actor) => {
let FSSource = shaders.Fragment;
if (model.renderable.getClippingPlanes().length > 0) {
const clipPlaneSize = model.renderable.getClippingPlanes().length;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::ClipPlane::Dec',
[
`uniform vec3 vClipPlaneNormals[6];`,
`uniform float vClipPlaneDistances[6];`,
`uniform vec3 vClipPlaneOrigins[6];`,
`uniform int clip_numPlanes;`,
'//VTK::ClipPlane::Dec',
'#define vtkClippingPlanesOn',
],
false
).result;
FSSource = vtkShaderProgram.substitute(
FSSource,
'//VTK::ClipPlane::Impl',
[
`for(int i = 0; i < ${clipPlaneSize}; i++) {`,
' float rayDirRatio = dot(rayDir, vClipPlaneNormals[i]);',
' float equationResult = dot(vertexVCVSOutput, vClipPlaneNormals[i]) + vClipPlaneDistances[i];',
' if (rayDirRatio == 0.0)',
' {',
' if (equationResult < 0.0) dists.x = dists.y;',
' continue;',
' }',
' float result = -1.0 * equationResult / rayDirRatio;',
' if (rayDirRatio < 0.0) dists.y = min(dists.y, result);',
' else dists.x = max(dists.x, result);',
'}',
'//VTK::ClipPlane::Impl',
],
false
).result;
}
shaders.Fragment = FSSource;
};
const recomputeLightComplexity = (actor, lights) => {
// do we need lighting?
let lightComplexity = 0;
if (
actor.getProperty().getShade() &&
model.renderable.getBlendMode() === BlendMode.COMPOSITE_BLEND
) {
// consider the lighting complexity to determine which case applies
// simple headlight, Light Kit, the whole feature set of VTK
lightComplexity = 0;
model.numberOfLights = 0;
lights.forEach((light) => {
const status = light.getSwitch();
if (status > 0) {
model.numberOfLights++;
if (lightComplexity === 0) {
lightComplexity = 1;
}
}
if (
lightComplexity === 1 &&
(model.numberOfLights > 1 ||
light.getIntensity() !== 1.0 ||
!light.lightTypeIsHeadLight())
) {
lightComplexity = 2;
}
if (lightComplexity < 3 && light.getPositional()) {
lightComplexity = 3;
}
});
}
if (lightComplexity !== model.lightComplexity) {
model.lightComplexity = lightComplexity;
publicAPI.modified();
}
};
publicAPI.getNeedToRebuildShaders = (cellBO, ren, actor) => {
const actorProps = actor.getProperty();
recomputeLightComplexity(actor, ren.getLights());
const numComp = model.scalarTexture.getComponents();
const opacityModes = [];
const forceNearestInterps = [];
for (let nc = 0; nc < numComp; nc++) {
opacityModes.push(actorProps.getOpacityMode(nc));
forceNearestInterps.push(actorProps.getForceNearestInterpolation(nc));
}
const ext = model.currentInput.getSpatialExtent();
const spc = model.currentInput.getSpacing();
const vsize = new Float64Array(3);
vec3.set(
vsize,
(ext[1] - ext[0]) * spc[0],
(ext[3] - ext[2]) * spc[1],
(ext[5] - ext[4]) * spc[2]
);
const maxSamples =
vec3.length(vsize) / publicAPI.getCurrentSampleDistance(ren);
const hasZBufferTexture = !!model.zBufferTexture;
const state = {
iComps: actorProps.getIndependentComponents(),
colorMixPreset: actorProps.getColorMixPreset(),
interpolationType: actorProps.getInterpolationType(),
useLabelOutline: actorProps.getUseLabelOutline(),
numComp,
maxSamples,
useGradientOpacity: actorProps.getUseGradientOpacity(0),
blendMode: model.renderable.getBlendMode(),
hasZBufferTexture,
opacityModes,
forceNearestInterps,
};
// We need to rebuild the shader if one of these variables has changed,
// since they are used in the shader template replacement step.
// We also need to rebuild if the shader source time is outdated.
if (
cellBO.getProgram()?.getHandle() === 0 ||
cellBO.getShaderSourceTime().getMTime() < publicAPI.getMTime() ||
cellBO.getShaderSourceTime().getMTime() < model.renderable.getMTime() ||
!model.previousState ||
!DeepEqual(model.previousState, state)
) {
model.previousState = state;
return true;
}
return false;
};
publicAPI.updateShaders = (cellBO, ren, actor) => {
// 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.getClippingPlaneShaderParameters(cellBO, ren, actor);
};
publicAPI.setMapperShaderParameters = (cellBO, ren, actor) => {
// Now to update the VAO too, if necessary.
const program = cellBO.getProgram();
if (
cellBO.getCABO().getElementCount() &&
(model.VBOBuildTime.getMTime() >
cellBO.getAttributeUpdateTime().getMTime() ||
cellBO.getShaderSourceTime().getMTime() >
cellBO.getAttributeUpdateTime().getMTime())
) {
if (program.isAttributeUsed('vertexDC')) {
Iif (
!cellBO
.getVAO()
.addAttributeArray(
program,
cellBO.getCABO(),
'vertexDC',
cellBO.getCABO().getVertexOffset(),
cellBO.getCABO().getStride(),
model.context.FLOAT,
3,
model.context.FALSE
)
) {
vtkErrorMacro('Error setting vertexDC in shader VAO.');
}
}
cellBO.getAttributeUpdateTime().modified();
}
program.setUniformi('texture1', model.scalarTexture.getTextureUnit());
program.setUniformf(
'sampleDistance',
publicAPI.getCurrentSampleDistance(ren)
);
const volInfo = model.scalarTexture.getVolumeInfo();
const ipScalarRange = model.renderable.getIpScalarRange();
const minVals = [];
const maxVals = [];
for (let i = 0; i < 4; i++) {
// convert iprange from 0-1 into data range values
minVals[i] =
ipScalarRange[0] * volInfo.dataComputedScale[i] +
volInfo.dataComputedOffset[i];
maxVals[i] =
ipScalarRange[1] * volInfo.dataComputedScale[i] +
volInfo.dataComputedOffset[i];
// convert data ranges into texture values
minVals[i] = (minVals[i] - volInfo.offset[i]) / volInfo.scale[i];
maxVals[i] = (maxVals[i] - volInfo.offset[i]) / volInfo.scale[i];
}
program.setUniform4f(
'ipScalarRangeMin',
minVals[0],
minVals[1],
minVals[2],
minVals[3]
);
program.setUniform4f(
'ipScalarRangeMax',
maxVals[0],
maxVals[1],
maxVals[2],
maxVals[3]
);
// if we have a zbuffer texture then set it
if (model.zBufferTexture !== null) {
program.setUniformi(
'zBufferTexture',
model.zBufferTexture.getTextureUnit()
);
const size = model._useSmallViewport
? [model._smallViewportWidth, model._smallViewportHeight]
: model._openGLRenderWindow.getFramebufferSize();
program.setUniformf('vpZWidth', size[0]);
program.setUniformf('vpZHeight', size[1]);
}
};
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.openGLVolume.getKeyMatrices();
mat4.multiply(model.modelToView, keyMats.wcvc, actMats.mcwc);
const program = cellBO.getProgram();
const cam = model.openGLCamera.getRenderable();
const crange = cam.getClippingRange();
program.setUniformf('camThick', crange[1] - crange[0]);
program.setUniformf('camNear', crange[0]);
program.setUniformf('camFar', crange[1]);
const bounds = model.currentInput.getBounds();
const dims = model.currentInput.getDimensions();
// compute the viewport bounds of the volume
// we will only render those fragments.
const pos = new Float64Array(3);
const dir = new Float64Array(3);
let dcxmin = 1.0;
let dcxmax = -1.0;
let dcymin = 1.0;
let dcymax = -1.0;
for (let i = 0; i < 8; ++i) {
vec3.set(
pos,
bounds[i % 2],
bounds[2 + (Math.floor(i / 2) % 2)],
bounds[4 + Math.floor(i / 4)]
);
vec3.transformMat4(pos, pos, model.modelToView);
if (!cam.getParallelProjection()) {
vec3.normalize(dir, pos);
// now find the projection of this point onto a
// nearZ distance plane. Since the camera is at 0,0,0
// in VC the ray is just t*pos and
// t is -nearZ/dir.z
// intersection becomes pos.x/pos.z
const t = -crange[0] / pos[2];
vec3.scale(pos, dir, t);
}
// now convert to DC
vec3.transformMat4(pos, pos, keyMats.vcpc);
dcxmin = Math.min(pos[0], dcxmin);
dcxmax = Math.max(pos[0], dcxmax);
dcymin = Math.min(pos[1], dcymin);
dcymax = Math.max(pos[1], dcymax);
}
program.setUniformf('dcxmin', dcxmin);
program.setUniformf('dcxmax', dcxmax);
program.setUniformf('dcymin', dcymin);
program.setUniformf('dcymax', dcymax);
if (program.isUniformUsed('cameraParallel')) {
program.setUniformi('cameraParallel', cam.getParallelProjection());
}
const ext = model.currentInput.getSpatialExtent();
const spc = model.currentInput.getSpacing();
const vsize = new Float64Array(3);
vec3.set(
vsize,
(ext[1] - ext[0]) * spc[0],
(ext[3] - ext[2]) * spc[1],
(ext[5] - ext[4]) * spc[2]
);
program.setUniform3f('vSpacing', spc[0], spc[1], spc[2]);
vec3.set(pos, ext[0], ext[2], ext[4]);
model.currentInput.indexToWorldVec3(pos, pos);
vec3.transformMat4(pos, pos, model.modelToView);
program.setUniform3f('vOriginVC', pos[0], pos[1], pos[2]);
// apply the image directions
const i2wmat4 = model.currentInput.getIndexToWorld();
mat4.multiply(model.idxToView, model.modelToView, i2wmat4);
mat3.multiply(
model.idxNormalMatrix,
keyMats.normalMatrix,
actMats.normalMatrix
);
mat3.multiply(
model.idxNormalMatrix,
model.idxNormalMatrix,
model.currentInput.getDirectionByReference()
);
const maxSamples =
vec3.length(vsize) / publicAPI.getCurrentSampleDistance(ren);
Iif (maxSamples > model.renderable.getMaximumSamplesPerRay()) {
vtkWarningMacro(`The number of steps required ${Math.ceil(
maxSamples
)} is larger than the
specified maximum number of steps ${model.renderable.getMaximumSamplesPerRay()}.
Please either change the
volumeMapper sampleDistance or its maximum number of samples.`);
}
const vctoijk = new Float64Array(3);
vec3.set(vctoijk, 1.0, 1.0, 1.0);
vec3.divide(vctoijk, vctoijk, vsize);
program.setUniform3f('vVCToIJK', vctoijk[0], vctoijk[1], vctoijk[2]);
program.setUniform3i('volumeDimensions', dims[0], dims[1], dims[2]);
Iif (!model._openGLRenderWindow.getWebgl2()) {
const volInfo = model.scalarTexture.getVolumeInfo();
program.setUniformf('texWidth', model.scalarTexture.getWidth());
program.setUniformf('texHeight', model.scalarTexture.getHeight());
program.setUniformi('xreps', volInfo.xreps);
program.setUniformi('xstride', volInfo.xstride);
program.setUniformi('ystride', volInfo.ystride);
}
// map normals through normal matrix
// then use a point on the plane to compute the distance
const normal = new Float64Array(3);
const pos2 = new Float64Array(3);
for (let i = 0; i < 6; ++i) {
switch (i) {
case 1:
vec3.set(normal, -1.0, 0.0, 0.0);
vec3.set(pos2, ext[0], ext[2], ext[4]);
break;
case 2:
vec3.set(normal, 0.0, 1.0, 0.0);
vec3.set(pos2, ext[1], ext[3], ext[5]);
break;
case 3:
vec3.set(normal, 0.0, -1.0, 0.0);
vec3.set(pos2, ext[0], ext[2], ext[4]);
break;
case 4:
vec3.set(normal, 0.0, 0.0, 1.0);
vec3.set(pos2, ext[1], ext[3], ext[5]);
break;
case 5:
vec3.set(normal, 0.0, 0.0, -1.0);
vec3.set(pos2, ext[0], ext[2], ext[4]);
break;
case 0:
default:
vec3.set(normal, 1.0, 0.0, 0.0);
vec3.set(pos2, ext[1], ext[3], ext[5]);
break;
}
vec3.transformMat3(normal, normal, model.idxNormalMatrix);
vec3.transformMat4(pos2, pos2, model.idxToView);
const dist = -1.0 * vec3.dot(pos2, normal);
// we have the plane in view coordinates
// specify the planes in view coordinates
program.setUniform3f(`vPlaneNormal${i}`, normal[0], normal[1], normal[2]);
program.setUniformf(`vPlaneDistance${i}`, dist);
}
Iif (actor.getProperty().getUseLabelOutline()) {
const image = model.currentInput;
const worldToIndex = image.getWorldToIndex();
program.setUniformMatrix('vWCtoIDX', worldToIndex);
const camera = ren.getActiveCamera();
const [cRange0, cRange1] = camera.getClippingRange();
const distance = camera.getDistance();
// set the clipping range to be model.distance and model.distance + 0.1
// since we use the in the keyMats.wcpc (world to projection) matrix
// the projection matrix calculation relies on the clipping range to be
// set correctly. This is done inside the interactorStyleMPRSlice which
// limits use cases where the interactor style is not used.
camera.setClippingRange(distance, distance + 0.1);
const labelOutlineKeyMats = model.openGLCamera.getKeyMatrices(ren);
// Get the projection coordinate to world coordinate transformation matrix.
mat4.invert(model.projectionToWorld, labelOutlineKeyMats.wcpc);
// reset the clipping range since the keyMats are cached
camera.setClippingRange(cRange0, cRange1);
// to re compute the matrices for the current camera and cache them
model.openGLCamera.getKeyMatrices(ren);
program.setUniformMatrix('PCWCMatrix', model.projectionToWorld);
const size = publicAPI.getRenderTargetSize();
program.setUniformf('vpWidth', size[0]);
program.setUniformf('vpHeight', size[1]);
const offset = publicAPI.getRenderTargetOffset();
program.setUniformf('vpOffsetX', offset[0] / size[0]);
program.setUniformf('vpOffsetY', offset[1] / size[1]);
}
mat4.invert(model.projectionToView, keyMats.vcpc);
program.setUniformMatrix('PCVCMatrix', model.projectionToView);
// handle lighting values
if (model.lightComplexity === 0) {
return;
}
let lightNum = 0;
const lightColor = [];
const lightDir = [];
const halfAngle = [];
ren.getLights().forEach((light) => {
const status = light.getSwitch();
if (status > 0) {
const dColor = light.getColor();
const intensity = light.getIntensity();
lightColor[0 + lightNum * 3] = dColor[0] * intensity;
lightColor[1 + lightNum * 3] = dColor[1] * intensity;
lightColor[2 + lightNum * 3] = dColor[2] * intensity;
const ldir = light.getDirection();
vec3.set(normal, ldir[0], ldir[1], ldir[2]);
vec3.transformMat3(normal, normal, keyMats.normalMatrix); // in view coordinat
vec3.normalize(normal, normal);
lightDir[0 + lightNum * 3] = normal[0];
lightDir[1 + lightNum * 3] = normal[1];
lightDir[2 + lightNum * 3] = normal[2];
// camera DOP is 0,0,-1.0 in VC
halfAngle[0 + lightNum * 3] = -0.5 * normal[0];
halfAngle[1 + lightNum * 3] = -0.5 * normal[1];
halfAngle[2 + lightNum * 3] = -0.5 * (normal[2] - 1.0);
lightNum++;
}
});
program.setUniformi('twoSidedLighting', ren.getTwoSidedLighting());
program.setUniformi('lightNum', lightNum);
program.setUniform3fv('lightColor', lightColor);
program.setUniform3fv('lightDirectionVC', lightDir);
program.setUniform3fv('lightHalfAngleVC', halfAngle);
if (model.lightComplexity === 3) {
lightNum = 0;
const lightPositionVC = [];
const lightAttenuation = [];
const lightConeAngle = [];
const lightExponent = [];
const lightPositional = [];
ren.getLights().forEach((light) => {
const status = light.getSwitch();
if (status > 0) {
const attenuation = light.getAttenuationValues();
lightAttenuation[0 + lightNum * 3] = attenuation[0];
lightAttenuation[1 + lightNum * 3] = attenuation[1];
lightAttenuation[2 + lightNum * 3] = attenuation[2];
lightExponent[lightNum] = light.getExponent();
lightConeAngle[lightNum] = light.getConeAngle();
lightPositional[lightNum] = light.getPositional();
const lp = light.getTransformedPosition();
vec3.transformMat4(lp, lp, model.modelToView);
lightPositionVC[0 + lightNum * 3] = lp[0];
lightPositionVC[1 + lightNum * 3] = lp[1];
lightPositionVC[2 + lightNum * 3] = lp[2];
lightNum += 1;
}
});
program.setUniform3fv('lightPositionVC', lightPositionVC);
program.setUniform3fv('lightAttenuation', lightAttenuation);
program.setUniformfv('lightConeAngle', lightConeAngle);
program.setUniformfv('lightExponent', lightExponent);
program.setUniformiv('lightPositional', lightPositional);
}
if (model.renderable.getVolumetricScatteringBlending() > 0.0) {
program.setUniformf(
'giReach',
model.renderable.getGlobalIlluminationReach()
);
program.setUniformf(
'volumetricScatteringBlending',
model.renderable.getVolumetricScatteringBlending()
);
program.setUniformf(
'volumeShadowSamplingDistFactor',
model.renderable.getVolumeShadowSamplingDistFactor()
);
program.setUniformf('anisotropy', model.renderable.getAnisotropy());
program.setUniformf(
'anisotropy2',
model.renderable.getAnisotropy() ** 2.0
);
}
Iif (
model.renderable.getLocalAmbientOcclusion() &&
actor.getProperty().getAmbient() > 0.0
) {
const ks = model.renderable.getLAOKernelSize();
program.setUniformi('kernelSize', ks);
const kernelSample = [];
for (let i = 0; i < ks; i++) {
kernelSample[i * 2] = Math.random() * 0.5;
kernelSample[i * 2 + 1] = Math.random() * 0.5;
}
program.setUniform2fv('kernelSample', kernelSample);
program.setUniformi(
'kernelRadius',
model.renderable.getLAOKernelRadius()
);
}
};
publicAPI.setPropertyShaderParameters = (cellBO, ren, actor) => {
const program = cellBO.getProgram();
program.setUniformi('ctexture', model.colorTexture.getTextureUnit());
program.setUniformi('otexture', model.opacityTexture.getTextureUnit());
program.setUniformi('jtexture', model.jitterTexture.getTextureUnit());
program.setUniformi(
'ttexture',
model.labelOutlineThicknessTexture.getTextureUnit()
);
const volInfo = model.scalarTexture.getVolumeInfo();
const vprop = actor.getProperty();
// set the component mix when independent
const numComp = model.scalarTexture.getComponents();
const useIndependentComps = publicAPI.useIndependentComponents(vprop);
if (useIndependentComps) {
for (let i = 0; i < numComp; i++) {
program.setUniformf(
`mix${i}`,
actor.getProperty().getComponentWeight(i)
);
}
}
// three levels of shift scale combined into one
// for performance in the fragment shader
for (let i = 0; i < numComp; i++) {
const target = useIndependentComps ? i : 0;
const sscale = volInfo.scale[i];
const ofun = vprop.getScalarOpacity(target);
const oRange = ofun.getRange();
const oscale = sscale / (oRange[1] - oRange[0]);
const oshift = (volInfo.offset[i] - oRange[0]) / (oRange[1] - oRange[0]);
program.setUniformf(`oshift${i}`, oshift);
program.setUniformf(`oscale${i}`, oscale);
const cfun = vprop.getRGBTransferFunction(target);
const cRange = cfun.getRange();
const cshift = (volInfo.offset[i] - cRange[0]) / (cRange[1] - cRange[0]);
const cScale = sscale / (cRange[1] - cRange[0]);
program.setUniformf(`cshift${i}`, cshift);
program.setUniformf(`cscale${i}`, cScale);
}
if (model.gopacity) {
if (useIndependentComps) {
for (let nc = 0; nc < numComp; ++nc) {
const sscale = volInfo.scale[nc];
const useGO = vprop.getUseGradientOpacity(nc);
if (useGO) {
const gomin = vprop.getGradientOpacityMinimumOpacity(nc);
const gomax = vprop.getGradientOpacityMaximumOpacity(nc);
program.setUniformf(`gomin${nc}`, gomin);
program.setUniformf(`gomax${nc}`, gomax);
const goRange = [
vprop.getGradientOpacityMinimumValue(nc),
vprop.getGradientOpacityMaximumValue(nc),
];
program.setUniformf(
`goscale${nc}`,
(sscale * (gomax - gomin)) / (goRange[1] - goRange[0])
);
program.setUniformf(
`goshift${nc}`,
(-goRange[0] * (gomax - gomin)) / (goRange[1] - goRange[0]) +
gomin
);
} else {
program.setUniformf(`gomin${nc}`, 1.0);
program.setUniformf(`gomax${nc}`, 1.0);
program.setUniformf(`goscale${nc}`, 0.0);
program.setUniformf(`goshift${nc}`, 1.0);
}
}
} else {
const sscale = volInfo.scale[numComp - 1];
const gomin = vprop.getGradientOpacityMinimumOpacity(0);
const gomax = vprop.getGradientOpacityMaximumOpacity(0);
program.setUniformf('gomin0', gomin);
program.setUniformf('gomax0', gomax);
const goRange = [
vprop.getGradientOpacityMinimumValue(0),
vprop.getGradientOpacityMaximumValue(0),
];
program.setUniformf(
'goscale0',
(sscale * (gomax - gomin)) / (goRange[1] - goRange[0])
);
program.setUniformf(
'goshift0',
(-goRange[0] * (gomax - gomin)) / (goRange[1] - goRange[0]) + gomin
);
}
}
const vtkImageLabelOutline = actor.getProperty().getUseLabelOutline();
Iif (vtkImageLabelOutline === true) {
const labelOutlineOpacity = actor.getProperty().getLabelOutlineOpacity();
program.setUniformf('outlineOpacity', labelOutlineOpacity);
}
if (model.lightComplexity > 0) {
program.setUniformf('vAmbient', vprop.getAmbient());
program.setUniformf('vDiffuse', vprop.getDiffuse());
program.setUniformf('vSpecular', vprop.getSpecular());
program.setUniformf('vSpecularPower', vprop.getSpecularPower());
}
};
publicAPI.getClippingPlaneShaderParameters = (cellBO, ren, actor) => {
if (model.renderable.getClippingPlanes().length > 0) {
const keyMats = model.openGLCamera.getKeyMatrices(ren);
const clipPlaneNormals = [];
const clipPlaneDistances = [];
const clipPlaneOrigins = [];
const clipPlanes = model.renderable.getClippingPlanes();
const clipPlaneSize = clipPlanes.length;
for (let i = 0; i < clipPlaneSize; ++i) {
const clipPlaneNormal = clipPlanes[i].getNormal();
const clipPlanePos = clipPlanes[i].getOrigin();
vec3.transformMat3(
clipPlaneNormal,
clipPlaneNormal,
keyMats.normalMatrix
);
vec3.transformMat4(clipPlanePos, clipPlanePos, keyMats.wcvc);
const clipPlaneDist = -1.0 * vec3.dot(clipPlanePos, clipPlaneNormal);
clipPlaneNormals.push(clipPlaneNormal[0]);
clipPlaneNormals.push(clipPlaneNormal[1]);
clipPlaneNormals.push(clipPlaneNormal[2]);
clipPlaneDistances.push(clipPlaneDist);
clipPlaneOrigins.push(clipPlanePos[0]);
clipPlaneOrigins.push(clipPlanePos[1]);
clipPlaneOrigins.push(clipPlanePos[2]);
}
const program = cellBO.getProgram();
program.setUniform3fv(`vClipPlaneNormals`, clipPlaneNormals);
program.setUniformfv(`vClipPlaneDistances`, clipPlaneDistances);
program.setUniform3fv(`vClipPlaneOrigins`, clipPlaneOrigins);
program.setUniformi(`clip_numPlanes`, clipPlaneSize);
}
};
// unsubscribe from our listeners
publicAPI.delete = macro.chain(() => {
if (model._animationRateSubscription) {
model._animationRateSubscription.unsubscribe();
model._animationRateSubscription = null;
}
}, publicAPI.delete);
publicAPI.getRenderTargetSize = () => {
if (model._useSmallViewport) {
return [model._smallViewportWidth, model._smallViewportHeight];
}
const { usize, vsize } = model._openGLRenderer.getTiledSizeAndOrigin();
return [usize, vsize];
};
publicAPI.getRenderTargetOffset = () => {
const { lowerLeftU, lowerLeftV } =
model._openGLRenderer.getTiledSizeAndOrigin();
return [lowerLeftU, lowerLeftV];
};
publicAPI.getCurrentSampleDistance = (ren) => {
const rwi = ren.getVTKWindow().getInteractor();
const baseSampleDistance = model.renderable.getSampleDistance();
Iif (rwi.isAnimating()) {
const factor = model.renderable.getInteractionSampleDistanceFactor();
return baseSampleDistance * factor;
}
return baseSampleDistance;
};
publicAPI.renderPieceStart = (ren, actor) => {
const rwi = ren.getVTKWindow().getInteractor();
if (!model._lastScale) {
model._lastScale = model.renderable.getInitialInteractionScale();
}
model._useSmallViewport = false;
Iif (rwi.isAnimating() && model._lastScale > 1.5) {
model._useSmallViewport = true;
}
if (!model._animationRateSubscription) {
// when the animation frame rate changes recompute the scale factor
model._animationRateSubscription = rwi.onAnimationFrameRateUpdate(() => {
if (model.renderable.getAutoAdjustSampleDistances()) {
const frate = rwi.getRecentAnimationFrameRate();
const adjustment = rwi.getDesiredUpdateRate() / frate;
// only change if we are off by 15%
if (adjustment > 1.15 || adjustment < 0.85) {
model._lastScale *= adjustment;
}
// clamp scale to some reasonable values.
// Below 1.5 we will just be using full resolution as that is close enough
// Above 400 seems like a lot so we limit to that 1/20th per axis
if (model._lastScale > 400) {
model._lastScale = 400;
}
if (model._lastScale < 1.5) {
model._lastScale = 1.5;
}
} else {
model._lastScale =
model.renderable.getImageSampleDistance() *
model.renderable.getImageSampleDistance();
}
});
}
// use/create/resize framebuffer if needed
Iif (model._useSmallViewport) {
const size = model._openGLRenderWindow.getFramebufferSize();
const scaleFactor = 1 / Math.sqrt(model._lastScale);
model._smallViewportWidth = Math.ceil(scaleFactor * size[0]);
model._smallViewportHeight = Math.ceil(scaleFactor * size[1]);
// adjust viewportSize to always be at most the dest fo size
if (model._smallViewportHeight > size[1]) {
model._smallViewportHeight = size[1];
}
if (model._smallViewportWidth > size[0]) {
model._smallViewportWidth = size[0];
}
model.framebuffer.saveCurrentBindingsAndBuffers();
if (model.framebuffer.getGLFramebuffer() === null) {
model.framebuffer.create(size[0], size[1]);
model.framebuffer.populateFramebuffer();
} else {
const fbSize = model.framebuffer.getSize();
if (!fbSize || fbSize[0] !== size[0] || fbSize[1] !== size[1]) {
model.framebuffer.create(size[0], size[1]);
model.framebuffer.populateFramebuffer();
}
}
model.framebuffer.bind();
const gl = model.context;
gl.clearColor(0.0, 0.0, 0.0, 0.0);
gl.colorMask(true, true, true, true);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.viewport(0, 0, model._smallViewportWidth, model._smallViewportHeight);
model.fvp = [
model._smallViewportWidth / size[0],
model._smallViewportHeight / size[1],
];
}
model.context.disable(model.context.DEPTH_TEST);
// make sure the BOs are up to date
publicAPI.updateBufferObjects(ren, actor);
// set interpolation on the texture based on property setting
const iType = actor.getProperty().getInterpolationType();
if (iType === InterpolationType.NEAREST) {
model.scalarTexture.setMinificationFilter(Filter.NEAREST);
model.scalarTexture.setMagnificationFilter(Filter.NEAREST);
} else {
model.scalarTexture.setMinificationFilter(Filter.LINEAR);
model.scalarTexture.setMagnificationFilter(Filter.LINEAR);
}
// if we have a zbuffer texture then activate it
if (model.zBufferTexture !== null) {
model.zBufferTexture.activate();
}
};
publicAPI.renderPieceDraw = (ren, actor) => {
const gl = model.context;
// render the texture
model.scalarTexture.activate();
model.opacityTexture.activate();
model.labelOutlineThicknessTexture.activate();
model.colorTexture.activate();
model.jitterTexture.activate();
publicAPI.updateShaders(model.tris, ren, actor);
// First we do the triangles, update the shader, set uniforms, etc.
// for (let i = 0; i < 11; ++i) {
// gl.drawArrays(gl.TRIANGLES, 66 * i, 66);
// }
gl.drawArrays(gl.TRIANGLES, 0, model.tris.getCABO().getElementCount());
model.tris.getVAO().release();
model.scalarTexture.deactivate();
model.colorTexture.deactivate();
model.opacityTexture.deactivate();
model.labelOutlineThicknessTexture.deactivate();
model.jitterTexture.deactivate();
};
publicAPI.renderPieceFinish = (ren, actor) => {
// if we have a zbuffer texture then deactivate it
if (model.zBufferTexture !== null) {
model.zBufferTexture.deactivate();
}
Iif (model._useSmallViewport) {
// now copy the framebuffer with the volume into the
// regular buffer
model.framebuffer.restorePreviousBindingsAndBuffers();
if (model.copyShader === null) {
model.copyShader = model._openGLRenderWindow
.getShaderCache()
.readyShaderProgramArray(
[
'//VTK::System::Dec',
'attribute vec4 vertexDC;',
'uniform vec2 tfactor;',
'varying vec2 tcoord;',
'void main() { tcoord = vec2(vertexDC.x*0.5 + 0.5, vertexDC.y*0.5 + 0.5) * tfactor; gl_Position = vertexDC; }',
].join('\n'),
[
'//VTK::System::Dec',
'//VTK::Output::Dec',
'uniform sampler2D texture1;',
'varying vec2 tcoord;',
'void main() { gl_FragData[0] = texture2D(texture1,tcoord); }',
].join('\n'),
''
);
const program = model.copyShader;
model.copyVAO = vtkVertexArrayObject.newInstance();
model.copyVAO.setOpenGLRenderWindow(model._openGLRenderWindow);
model.tris.getCABO().bind();
if (
!model.copyVAO.addAttributeArray(
program,
model.tris.getCABO(),
'vertexDC',
model.tris.getCABO().getVertexOffset(),
model.tris.getCABO().getStride(),
model.context.FLOAT,
3,
model.context.FALSE
)
) {
vtkErrorMacro('Error setting vertexDC in copy shader VAO.');
}
} else {
model._openGLRenderWindow
.getShaderCache()
.readyShaderProgram(model.copyShader);
}
const size = model._openGLRenderWindow.getFramebufferSize();
model.context.viewport(0, 0, size[0], size[1]);
// activate texture
const tex = model.framebuffer.getColorTexture();
tex.activate();
model.copyShader.setUniformi('texture', tex.getTextureUnit());
model.copyShader.setUniform2f('tfactor', model.fvp[0], model.fvp[1]);
const gl = model.context;
gl.blendFuncSeparate(
gl.ONE,
gl.ONE_MINUS_SRC_ALPHA,
gl.ONE,
gl.ONE_MINUS_SRC_ALPHA
);
// render quad
model.context.drawArrays(
model.context.TRIANGLES,
0,
model.tris.getCABO().getElementCount()
);
tex.deactivate();
gl.blendFuncSeparate(
gl.SRC_ALPHA,
gl.ONE_MINUS_SRC_ALPHA,
gl.ONE,
gl.ONE_MINUS_SRC_ALPHA
);
}
};
publicAPI.renderPiece = (ren, actor) => {
publicAPI.invokeEvent({ type: 'StartEvent' });
model.renderable.update();
model.currentInput = model.renderable.getInputData();
publicAPI.invokeEvent({ type: 'EndEvent' });
Iif (!model.currentInput) {
vtkErrorMacro('No input!');
return;
}
publicAPI.renderPieceStart(ren, actor);
publicAPI.renderPieceDraw(ren, actor);
publicAPI.renderPieceFinish(ren, actor);
};
publicAPI.computeBounds = (ren, actor) => {
if (!publicAPI.getInput()) {
vtkMath.uninitializeBounds(model.Bounds);
return;
}
model.bounds = publicAPI.getInput().getBounds();
};
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
if (
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()
) {
return true;
}
return false;
};
publicAPI.buildBufferObjects = (ren, actor) => {
const image = model.currentInput;
Iif (!image) {
return;
}
const scalars = image.getPointData() && image.getPointData().getScalars();
Iif (!scalars) {
return;
}
if (model._scalars !== scalars) {
model._openGLRenderWindow.releaseGraphicsResourcesForObject(
model._scalars
);
model._scalars = scalars;
}
const vprop = actor.getProperty();
if (!model.jitterTexture.getHandle()) {
const oTable = new Uint8Array(32 * 32);
for (let i = 0; i < 32 * 32; ++i) {
oTable[i] = 255.0 * Math.random();
}
model.jitterTexture.setMinificationFilter(Filter.LINEAR);
model.jitterTexture.setMagnificationFilter(Filter.LINEAR);
model.jitterTexture.create2DFromRaw(
32,
32,
1,
VtkDataTypes.UNSIGNED_CHAR,
oTable
);
}
const numComp = scalars.getNumberOfComponents();
const useIndependentComps = publicAPI.useIndependentComponents(vprop);
const numIComps = useIndependentComps ? numComp : 1;
const scalarOpacityFunc = vprop.getScalarOpacity();
const opTex =
model._openGLRenderWindow.getGraphicsResourceForObject(scalarOpacityFunc);
let toString = computeFnToString(
scalarOpacityFunc,
useIndependentComps,
numIComps
);
const reBuildOp =
!opTex.vtkObj ||
opTex.hash !== toString ||
model.opacityTextureString !== toString;
if (reBuildOp) {
// rebuild opacity tfun?
const oWidth = 1024;
const oSize = oWidth * 2 * numIComps;
const ofTable = new Float32Array(oSize);
const tmpTable = new Float32Array(oWidth);
for (let c = 0; c < numIComps; ++c) {
const ofun = vprop.getScalarOpacity(c);
const opacityFactor =
publicAPI.getCurrentSampleDistance(ren) /
vprop.getScalarOpacityUnitDistance(c);
const oRange = ofun.getRange();
ofun.getTable(oRange[0], oRange[1], oWidth, tmpTable, 1);
// adjust for sample distance etc
for (let i = 0; i < oWidth; ++i) {
ofTable[c * oWidth * 2 + i] =
1.0 - (1.0 - tmpTable[i]) ** opacityFactor;
ofTable[c * oWidth * 2 + i + oWidth] = ofTable[c * oWidth * 2 + i];
}
}
model.opacityTexture.releaseGraphicsResources(model._openGLRenderWindow);
model.opacityTexture.resetFormatAndType();
model.opacityTexture.setMinificationFilter(Filter.LINEAR);
model.opacityTexture.setMagnificationFilter(Filter.LINEAR);
// use float texture where possible because we really need the resolution
// for this table. Errors in low values of opacity accumulate to
// visible artifacts. High values of opacity quickly terminate without
// artifacts.
if (
model._openGLRenderWindow.getWebgl2() ||
(model.context.getExtension('OES_texture_float') &&
model.context.getExtension('OES_texture_float_linear'))
) {
model.opacityTexture.create2DFromRaw(
oWidth,
2 * numIComps,
1,
VtkDataTypes.FLOAT,
ofTable
);
} else E{
const oTable = new Uint8ClampedArray(oSize);
for (let i = 0; i < oSize; ++i) {
oTable[i] = 255.0 * ofTable[i];
}
model.opacityTexture.create2DFromRaw(
oWidth,
2 * numIComps,
1,
VtkDataTypes.UNSIGNED_CHAR,
oTable
);
}
model.opacityTextureString = toString;
if (scalarOpacityFunc) {
model._openGLRenderWindow.setGraphicsResourceForObject(
scalarOpacityFunc,
model.opacityTexture,
model.opacityTextureString
);
}
} else {
model.opacityTexture = opTex.vtkObj;
model.opacityTextureString = opTex.hash;
}
// rebuild color tfun?
const colorTransferFunc = vprop.getRGBTransferFunction();
toString = computeFnToString(
colorTransferFunc,
useIndependentComps,
numIComps
);
const cTex =
model._openGLRenderWindow.getGraphicsResourceForObject(colorTransferFunc);
const reBuildC =
!cTex?.vtkObj ||
cTex?.hash !== toString ||
model.colorTextureString !== toString;
if (reBuildC) {
const cWidth = 1024;
const cSize = cWidth * 2 * numIComps * 3;
const cTable = new Uint8ClampedArray(cSize);
const tmpTable = new Float32Array(cWidth * 3);
for (let c = 0; c < numIComps; ++c) {
const cfun = vprop.getRGBTransferFunction(c);
const cRange = cfun.getRange();
cfun.getTable(cRange[0], cRange[1], cWidth, tmpTable, 1);
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];
}
}
model.colorTexture.releaseGraphicsResources(model._openGLRenderWindow);
model.colorTexture.resetFormatAndType();
model.colorTexture.setMinificationFilter(Filter.LINEAR);
model.colorTexture.setMagnificationFilter(Filter.LINEAR);
model.colorTexture.create2DFromRaw(
cWidth,
2 * numIComps,
3,
VtkDataTypes.UNSIGNED_CHAR,
cTable
);
model.colorTextureString = toString;
if (colorTransferFunc) {
model._openGLRenderWindow.setGraphicsResourceForObject(
colorTransferFunc,
model.colorTexture,
model.colorTextureString
);
}
} else {
model.colorTexture = cTex.vtkObj;
model.colorTextureString = cTex.hash;
}
publicAPI.updateLabelOutlineThicknessTexture(actor);
const tex = model._openGLRenderWindow.getGraphicsResourceForObject(scalars);
// rebuild the scalarTexture if the data has changed
toString = `${image.getMTime()}A${scalars.getMTime()}`;
const reBuildTex = !tex?.vtkObj || tex?.hash !== toString;
if (reBuildTex) {
// Build the textures
const dims = image.getDimensions();
// Use norm16 for scalar texture if the extension is available
model.scalarTexture.setOglNorm16Ext(
model.context.getExtension('EXT_texture_norm16')
);
model.scalarTexture.releaseGraphicsResources(model._openGLRenderWindow);
model.scalarTexture.resetFormatAndType();
model.scalarTexture.create3DFilterableFromDataArray(
dims[0],
dims[1],
dims[2],
scalars,
model.renderable.getPreferSizeOverAccuracy()
);
if (scalars) {
model._openGLRenderWindow.setGraphicsResourceForObject(
scalars,
model.scalarTexture,
toString
);
}
} else {
model.scalarTexture = tex.vtkObj;
}
if (!model.tris.getCABO().getElementCount()) {
// build the CABO
const ptsArray = new Float32Array(12);
for (let i = 0; i < 4; i++) {
ptsArray[i * 3] = (i % 2) * 2 - 1.0;
ptsArray[i * 3 + 1] = i > 1 ? 1.0 : -1.0;
ptsArray[i * 3 + 2] = -1.0;
}
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 dim = 12.0;
// const ptsArray = new Float32Array(3 * dim * dim);
// for (let i = 0; i < dim; i++) {
// for (let j = 0; j < dim; j++) {
// const offset = ((i * dim) + j) * 3;
// ptsArray[offset] = (2.0 * (i / (dim - 1.0))) - 1.0;
// ptsArray[offset + 1] = (2.0 * (j / (dim - 1.0))) - 1.0;
// ptsArray[offset + 2] = -1.0;
// }
// }
// const cellArray = new Uint16Array(8 * (dim - 1) * (dim - 1));
// for (let i = 0; i < dim - 1; i++) {
// for (let j = 0; j < dim - 1; j++) {
// const offset = 8 * ((i * (dim - 1)) + j);
// cellArray[offset] = 3;
// cellArray[offset + 1] = (i * dim) + j;
// cellArray[offset + 2] = (i * dim) + 1 + j;
// cellArray[offset + 3] = ((i + 1) * dim) + 1 + j;
// cellArray[offset + 4] = 3;
// cellArray[offset + 5] = (i * dim) + j;
// cellArray[offset + 6] = ((i + 1) * dim) + 1 + j;
// cellArray[offset + 7] = ((i + 1) * dim) + j;
// }
// }
const points = vtkDataArray.newInstance({
numberOfComponents: 3,
values: ptsArray,
});
points.setName('points');
const cells = vtkDataArray.newInstance({
numberOfComponents: 1,
values: cellArray,
});
model.tris.getCABO().createVBO(cells, 'polys', Representation.SURFACE, {
points,
cellOffset: 0,
});
}
model.VBOBuildTime.modified();
};
publicAPI.updateLabelOutlineThicknessTexture = (volume) => {
const labelOutlineThicknessArray = volume
.getProperty()
.getLabelOutlineThickness();
const lTex = model._openGLRenderWindow.getGraphicsResourceForObject(
labelOutlineThicknessArray
);
// compute the join of the labelOutlineThicknessArray so that
// we can use it to decide whether to rebuild the labelOutlineThicknessTexture
// or not
const toString = `${labelOutlineThicknessArray.join('-')}`;
const reBuildL =
!lTex?.vtkObj ||
lTex?.hash !== toString ||
model.labelOutlineThicknessTextureString !== toString;
if (reBuildL) {
const lWidth = 1024;
const lHeight = 1;
const lSize = lWidth * lHeight;
const lTable = new Uint8Array(lSize);
// Assuming labelOutlineThicknessArray contains the thickness for each segment
for (let i = 0; i < lWidth; ++i) {
// Retrieve the thickness value for the current segment index.
// If the value is undefined, use the first element's value as a default, otherwise use the value (even if 0)
const thickness =
typeof labelOutlineThicknessArray[i] !== 'undefined'
? labelOutlineThicknessArray[i]
: labelOutlineThicknessArray[0];
lTable[i] = thickness;
}
model.labelOutlineThicknessTexture.releaseGraphicsResources(
model._openGLRenderWindow
);
model.labelOutlineThicknessTexture.resetFormatAndType();
model.labelOutlineThicknessTexture.setMinificationFilter(Filter.NEAREST);
model.labelOutlineThicknessTexture.setMagnificationFilter(Filter.NEAREST);
// Create a 2D texture (acting as 1D) from the raw data
model.labelOutlineThicknessTexture.create2DFromRaw(
lWidth,
lHeight,
1,
VtkDataTypes.UNSIGNED_CHAR,
lTable
);
model.labelOutlineThicknessTextureString = toString;
if (labelOutlineThicknessArray) {
model._openGLRenderWindow.setGraphicsResourceForObject(
labelOutlineThicknessArray,
model.labelOutlineThicknessTexture,
model.labelOutlineThicknessTextureString
);
}
} else E{
model.labelOutlineThicknessTexture = lTex.vtkObj;
model.labelOutlineThicknessTextureString = lTex.hash;
}
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
context: null,
VBOBuildTime: null,
scalarTexture: null,
scalarTextureString: null,
opacityTexture: null,
opacityTextureString: null,
colorTexture: null,
colorTextureString: null,
jitterTexture: null,
labelOutlineThicknessTexture: null,
labelOutlineThicknessTextureString: null,
tris: null,
framebuffer: null,
copyShader: null,
copyVAO: null,
lastXYF: 1.0,
targetXYF: 1.0,
zBufferTexture: null,
lastZBufferTexture: null,
lightComplexity: 0,
fullViewportTime: 1.0,
idxToView: null,
idxNormalMatrix: null,
modelToView: null,
projectionToView: null,
avgWindowArea: 0.0,
avgFrameTime: 0.0,
_scalars: null,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Inheritance
vtkViewNode.extend(publicAPI, model, initialValues);
vtkReplacementShaderMapper.implementBuildShadersWithReplacements(
publicAPI,
model,
initialValues
);
model.VBOBuildTime = {};
macro.obj(model.VBOBuildTime, { mtime: 0 });
model.tris = vtkHelper.newInstance();
model.scalarTexture = vtkOpenGLTexture.newInstance();
model.opacityTexture = vtkOpenGLTexture.newInstance();
model.colorTexture = vtkOpenGLTexture.newInstance();
model.jitterTexture = vtkOpenGLTexture.newInstance();
model.jitterTexture.setWrapS(Wrap.REPEAT);
model.jitterTexture.setWrapT(Wrap.REPEAT);
model.labelOutlineThicknessTexture = vtkOpenGLTexture.newInstance();
model.framebuffer = vtkOpenGLFramebuffer.newInstance();
model.idxToView = mat4.identity(new Float64Array(16));
model.idxNormalMatrix = mat3.identity(new Float64Array(9));
model.modelToView = mat4.identity(new Float64Array(16));
model.projectionToView = mat4.identity(new Float64Array(16));
model.projectionToWorld = mat4.identity(new Float64Array(16));
// Build VTK API
macro.setGet(publicAPI, model, ['context']);
// Object methods
vtkOpenGLVolumeMapper(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkOpenGLVolumeMapper');
// ----------------------------------------------------------------------------
export default { newInstance, extend };
// Register ourself to OpenGL backend if imported
registerOverride('vtkVolumeMapper', newInstance);
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