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import vtkCellArrayBufferObject from 'vtk.js/Sources/Rendering/OpenGL/CellArrayBufferObject';
import vtkShaderProgram from 'vtk.js/Sources/Rendering/OpenGL/ShaderProgram';
import vtkVertexArrayObject from 'vtk.js/Sources/Rendering/OpenGL/VertexArrayObject';
import { Representation } from 'vtk.js/Sources/Rendering/Core/Property/Constants';
export const primTypes = {
Start: 0,
Points: 0,
Lines: 1,
Tris: 2,
TriStrips: 3,
TrisEdges: 4,
TriStripsEdges: 5,
End: 6,
};
// ----------------------------------------------------------------------------
// vtkOpenGLHelper methods
// ----------------------------------------------------------------------------
function vtkOpenGLHelper(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkOpenGLHelper');
publicAPI.setOpenGLRenderWindow = (win) => {
model.context = win.getContext();
model.program.setContext(model.context);
model.VAO.setOpenGLRenderWindow(win);
model.CABO.setOpenGLRenderWindow(win);
};
publicAPI.releaseGraphicsResources = (oglwin) => {
model.VAO.releaseGraphicsResources();
model.CABO.releaseGraphicsResources();
model.CABO.setElementCount(0);
};
publicAPI.drawArrays = (ren, actor, rep, oglMapper) => {
// Are there any entries
if (model.CABO.getElementCount()) {
// are we drawing edges
const mode = publicAPI.getOpenGLMode(rep);
const wideLines = publicAPI.haveWideLines(ren, actor);
const gl = model.context;
const depthMask = gl.getParameter(gl.DEPTH_WRITEMASK);
if (model.pointPicking) {
gl.depthMask(false);
}
const drawingLines = mode === gl.LINES;
if (drawingLines && wideLines) {
publicAPI.updateShaders(ren, actor, oglMapper);
gl.drawArraysInstanced(
mode,
0,
model.CABO.getElementCount(),
2 * Math.ceil(actor.getProperty().getLineWidth())
);
} else {
gl.lineWidth(actor.getProperty().getLineWidth());
publicAPI.updateShaders(ren, actor, oglMapper);
gl.drawArrays(mode, 0, model.CABO.getElementCount());
// reset the line width
gl.lineWidth(1);
}
const stride =
(mode === gl.POINTS ? 1 : 0) || (mode === gl.LINES ? 2 : 3);
if (model.pointPicking) {
gl.depthMask(depthMask);
}
return model.CABO.getElementCount() / stride;
}
return 0;
};
publicAPI.getOpenGLMode = (rep) => {
if (model.pointPicking) {
return model.context.POINTS;
}
const type = model.primitiveType;
if (rep === Representation.POINTS || type === primTypes.Points) {
return model.context.POINTS;
}
if (
rep === Representation.WIREFRAME ||
type === primTypes.Lines ||
type === primTypes.TrisEdges ||
type === primTypes.TriStripsEdges
) {
return model.context.LINES;
}
return model.context.TRIANGLES;
};
publicAPI.haveWideLines = (ren, actor) => {
if (actor.getProperty().getLineWidth() > 1.0) {
// we have wide lines, but the OpenGL implementation may
// actually support them, check the range to see if we
// really need have to implement our own wide lines
if (model.CABO.getOpenGLRenderWindow()) {
Iif (
model.CABO.getOpenGLRenderWindow().getHardwareMaximumLineWidth() >=
actor.getProperty().getLineWidth()
) {
return false;
}
}
return true;
}
return false;
};
publicAPI.getNeedToRebuildShaders = (ren, actor, oglMapper) => {
// has something changed that would require us to recreate the shader?
// candidates are
// property modified (representation interpolation and lighting)
// input modified
// mapper modified (lighting complexity)
if (
oglMapper.getNeedToRebuildShaders(publicAPI, ren, actor) ||
publicAPI.getProgram() === 0 ||
publicAPI.getShaderSourceTime().getMTime() < oglMapper.getMTime() ||
publicAPI.getShaderSourceTime().getMTime() < actor.getMTime()
) {
return true;
}
return false;
};
publicAPI.updateShaders = (ren, actor, oglMapper) => {
// has something changed that would require us to recreate the shader?
if (publicAPI.getNeedToRebuildShaders(ren, actor, oglMapper)) {
const shaders = { Vertex: null, Fragment: null, Geometry: null };
oglMapper.buildShaders(shaders, ren, actor);
// compile and bind the program if needed
const newShader = model.CABO.getOpenGLRenderWindow()
.getShaderCache()
.readyShaderProgramArray(
shaders.Vertex,
shaders.Fragment,
shaders.Geometry
);
// if the shader changed reinitialize the VAO
if (newShader !== publicAPI.getProgram()) {
publicAPI.setProgram(newShader);
// reset the VAO as the shader has changed
publicAPI.getVAO().releaseGraphicsResources();
}
publicAPI.getShaderSourceTime().modified();
} else {
model.CABO.getOpenGLRenderWindow()
.getShaderCache()
.readyShaderProgram(publicAPI.getProgram());
}
publicAPI.getVAO().bind();
oglMapper.setMapperShaderParameters(publicAPI, ren, actor);
oglMapper.setPropertyShaderParameters(publicAPI, ren, actor);
oglMapper.setCameraShaderParameters(publicAPI, ren, actor);
oglMapper.setLightingShaderParameters(publicAPI, ren, actor);
oglMapper.invokeShaderCallbacks(publicAPI, ren, actor);
};
publicAPI.setMapperShaderParameters = (ren, actor, size) => {
if (publicAPI.haveWideLines(ren, actor)) {
publicAPI
.getProgram()
.setUniform2f('viewportSize', size.usize, size.vsize);
const lineWidth = parseFloat(actor.getProperty().getLineWidth());
const halfLineWidth = lineWidth / 2.0;
publicAPI
.getProgram()
.setUniformf('lineWidthStepSize', lineWidth / Math.ceil(lineWidth));
publicAPI.getProgram().setUniformf('halfLineWidth', halfLineWidth);
}
if (
model.primitiveType === primTypes.Points ||
actor.getProperty().getRepresentation() === Representation.POINTS
) {
publicAPI
.getProgram()
.setUniformf('pointSize', actor.getProperty().getPointSize());
} else if (model.pointPicking) {
publicAPI
.getProgram()
.setUniformf('pointSize', publicAPI.getPointPickingPrimitiveSize());
}
};
publicAPI.replaceShaderPositionVC = (shaders, ren, actor) => {
let VSSource = shaders.Vertex;
// Always set point size in case we need picking
VSSource = vtkShaderProgram.substitute(VSSource, '//VTK::PositionVC::Dec', [
'//VTK::PositionVC::Dec',
'uniform float pointSize;',
]).result;
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::PositionVC::Impl',
['//VTK::PositionVC::Impl', ' gl_PointSize = pointSize;'],
false
).result;
// for lines, make sure we add the width code
if (
publicAPI.getOpenGLMode(actor.getProperty().getRepresentation()) ===
model.context.LINES &&
publicAPI.haveWideLines(ren, actor)
) {
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::PositionVC::Dec',
[
'//VTK::PositionVC::Dec',
'uniform vec2 viewportSize;',
'uniform float lineWidthStepSize;',
'uniform float halfLineWidth;',
]
).result;
VSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::PositionVC::Impl',
[
'//VTK::PositionVC::Impl',
' if (halfLineWidth > 0.0)',
' {',
' float offset = float(gl_InstanceID / 2) * lineWidthStepSize - halfLineWidth;',
' vec4 tmpPos = gl_Position;',
' vec3 tmpPos2 = tmpPos.xyz / tmpPos.w;',
' tmpPos2.x = tmpPos2.x + 2.0 * mod(float(gl_InstanceID), 2.0) * offset / viewportSize[0];',
' tmpPos2.y = tmpPos2.y + 2.0 * mod(float(gl_InstanceID + 1), 2.0) * offset / viewportSize[1];',
' gl_Position = vec4(tmpPos2.xyz * tmpPos.w, tmpPos.w);',
' }',
]
).result;
}
shaders.Vertex = VSSource;
};
publicAPI.getPointPickingPrimitiveSize = () => {
Iif (model.primitiveType === primTypes.Points) {
return 2;
}
if (model.primitiveType === primTypes.Lines) {
return 4;
}
return 6;
};
publicAPI.getAllocatedGPUMemoryInBytes = () =>
publicAPI.getCABO().getAllocatedGPUMemoryInBytes();
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
context: null,
program: null,
shaderSourceTime: null,
VAO: null,
attributeUpdateTime: null,
CABO: null,
primitiveType: 0,
pointPicking: false,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Build VTK API
macro.obj(publicAPI, model);
model.shaderSourceTime = {};
macro.obj(model.shaderSourceTime);
model.attributeUpdateTime = {};
macro.obj(model.attributeUpdateTime);
macro.setGet(publicAPI, model, [
'program',
'shaderSourceTime',
'VAO',
'attributeUpdateTime',
'CABO',
'primitiveType',
'pointPicking',
]);
model.program = vtkShaderProgram.newInstance();
model.VAO = vtkVertexArrayObject.newInstance();
model.CABO = vtkCellArrayBufferObject.newInstance();
// Object methods
vtkOpenGLHelper(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend);
// ----------------------------------------------------------------------------
export default { newInstance, extend, primTypes };
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