FullScreenQuad

Source

index.js
import macro from 'vtk.js/Sources/macros';
import vtkWebGPUShaderCache from 'vtk.js/Sources/Rendering/WebGPU/ShaderCache';
import vtkWebGPUMapperHelper from 'vtk.js/Sources/Rendering/WebGPU/MapperHelper';

// ----------------------------------------------------------------------------
// vtkWebGPUFullScreenQuad methods
// ----------------------------------------------------------------------------

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

publicAPI.replaceShaderPosition = (hash, pipeline, vertexInput) => {
const vDesc = pipeline.getShaderDescription('vertex');
vDesc.addBuiltinOutput('vec4<f32>', '[[builtin(position)]] Position');
let code = vDesc.getCode();
code = vtkWebGPUShaderCache.substitute(code, '//VTK::Position::Impl', [
'output.tcoordVS = vec2<f32>(vertexBC.x * 0.5 + 0.5, 1.0 - vertexBC.y * 0.5 - 0.5);',
'output.Position = vec4<f32>(vertexBC, 1.0);',
]).result;
vDesc.setCode(code);
};
model.shaderReplacements.set(
'replaceShaderPosition',
publicAPI.replaceShaderPosition
);

const superclassBuild = publicAPI.build;
publicAPI.build = (renderEncoder, device) => {
const buff = device.getBufferManager().getFullScreenQuadBuffer();
model.vertexInput.addBuffer(buff, ['vertexBC']);
model.numberOfVertices = 6;
superclassBuild(renderEncoder, device);
};
}

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

const DEFAULT_VALUES = {};

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

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

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

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

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

export const newInstance = macro.newInstance(extend, 'vtkWebGPUFullScreenQuad');

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

export default { newInstance, extend };