@kitware/vtk.js
Version:
Visualization Toolkit for the Web
257 lines (235 loc) • 9.17 kB
JavaScript
import { m as macro } from '../../macros2.js';
import vtkWebGPUTexture from './Texture.js';
import vtkWebGPURenderEncoder from './RenderEncoder.js';
import vtkWebGPUShaderCache from './ShaderCache.js';
import vtkRenderPass from '../SceneGraph/RenderPass.js';
import vtkWebGPUFullScreenQuad from './FullScreenQuad.js';
// ----------------------------------------------------------------------------
const oitpFragTemplate = `
//VTK::Mapper::Dec
//VTK::TCoord::Dec
//VTK::RenderEncoder::Dec
//VTK::IOStructs::Dec
@fragment
fn main(
//VTK::IOStructs::Input
)
//VTK::IOStructs::Output
{
var output: fragmentOutput;
var tcoord: vec2<i32> = vec2<i32>(i32(input.fragPos.x), i32(input.fragPos.y));
var reveal: f32 = textureLoad(oitpAccumTexture, tcoord, 0).r;
if (reveal == 1.0) { discard; }
var tcolor: vec4<f32> = textureLoad(oitpColorTexture, tcoord, 0);
var total: f32 = max(tcolor.a, 0.01);
var computedColor: vec4<f32> = vec4<f32>(tcolor.r/total, tcolor.g/total, tcolor.b/total, 1.0 - reveal);
//VTK::RenderEncoder::Impl
return output;
}
`;
function vtkWebGPUOrderIndependentTranslucentPass(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkWebGPUOrderIndependentTranslucentPass');
// this pass implements a forward rendering pipeline
// if both volumes and opaque geometry are present
// it will mix the two together by capturing a zbuffer
// first
publicAPI.traverse = (renNode, viewNode) => {
if (model.deleted) {
return;
}
// we just render our delegates in order
model._currentParent = viewNode;
const device = viewNode.getDevice();
if (!model.translucentRenderEncoder) {
publicAPI.createRenderEncoder();
publicAPI.createFinalEncoder();
model.translucentColorTexture = vtkWebGPUTexture.newInstance({
label: 'translucentPassColor'
});
model.translucentColorTexture.create(device, {
width: viewNode.getCanvas().width,
height: viewNode.getCanvas().height,
format: 'rgba16float',
/* eslint-disable no-undef */
/* eslint-disable no-bitwise */
usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.TEXTURE_BINDING
});
const v1 = model.translucentColorTexture.createView('oitpColorTexture');
model.translucentRenderEncoder.setColorTextureView(0, v1);
model.translucentAccumulateTexture = vtkWebGPUTexture.newInstance({
label: 'translucentPassAccumulate'
});
model.translucentAccumulateTexture.create(device, {
width: viewNode.getCanvas().width,
height: viewNode.getCanvas().height,
format: 'r16float',
/* eslint-disable no-undef */
/* eslint-disable no-bitwise */
usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.TEXTURE_BINDING
});
const v2 = model.translucentAccumulateTexture.createView('oitpAccumTexture');
model.translucentRenderEncoder.setColorTextureView(1, v2);
model.fullScreenQuad = vtkWebGPUFullScreenQuad.newInstance();
model.fullScreenQuad.setDevice(viewNode.getDevice());
model.fullScreenQuad.setPipelineHash('oitpfsq');
model.fullScreenQuad.setTextureViews(model.translucentRenderEncoder.getColorTextureViews());
model.fullScreenQuad.setFragmentShaderTemplate(oitpFragTemplate);
} else {
model.translucentColorTexture.resizeToMatch(model.colorTextureView.getTexture());
model.translucentAccumulateTexture.resizeToMatch(model.colorTextureView.getTexture());
}
model.translucentRenderEncoder.setDepthTextureView(model.depthTextureView);
model.translucentRenderEncoder.attachTextureViews();
publicAPI.setCurrentOperation('translucentPass');
renNode.setRenderEncoder(model.translucentRenderEncoder);
renNode.traverse(publicAPI);
publicAPI.finalPass(viewNode, renNode);
};
publicAPI.finalPass = (viewNode, renNode) => {
model.translucentFinalEncoder.setColorTextureView(0, model.colorTextureView);
model.translucentFinalEncoder.attachTextureViews();
model.translucentFinalEncoder.begin(viewNode.getCommandEncoder());
renNode.scissorAndViewport(model.translucentFinalEncoder);
model.fullScreenQuad.prepareAndDraw(model.translucentFinalEncoder);
model.translucentFinalEncoder.end();
};
publicAPI.getTextures = () => [model.translucentColorTexture, model.translucentAccumulateTexture];
publicAPI.createRenderEncoder = () => {
model.translucentRenderEncoder = vtkWebGPURenderEncoder.newInstance({
label: 'translucentRender'
});
const rDesc = model.translucentRenderEncoder.getDescription();
rDesc.colorAttachments = [{
view: undefined,
clearValue: [0.0, 0.0, 0.0, 0.0],
loadOp: 'clear',
storeOp: 'store'
}, {
view: undefined,
clearValue: [1.0, 0.0, 0.0, 0.0],
loadOp: 'clear',
storeOp: 'store'
}];
rDesc.depthStencilAttachment = {
view: undefined,
depthLoadOp: 'load',
depthStoreOp: 'store'
};
model.translucentRenderEncoder.setReplaceShaderCodeFunction(pipeline => {
const fDesc = pipeline.getShaderDescription('fragment');
fDesc.addOutput('vec4<f32>', 'outColor');
fDesc.addOutput('f32', 'outAccum');
fDesc.addBuiltinInput('vec4<f32>', '@builtin(position) fragPos');
let code = fDesc.getCode();
code = vtkWebGPUShaderCache.substitute(code, '//VTK::RenderEncoder::Impl', [
// very simple depth weighting in w z ranges from 1.0 near to 0.0
'var w: f32 = computedColor.a * pow(0.1 + input.fragPos.z, 2.0);', 'output.outColor = vec4<f32>(computedColor.rgb*w, w);', 'output.outAccum = computedColor.a;']).result;
fDesc.setCode(code);
});
model.translucentRenderEncoder.setPipelineHash('oitpr');
model.translucentRenderEncoder.setPipelineSettings({
primitive: {
cullMode: 'none'
},
depthStencil: {
depthWriteEnabled: false,
depthCompare: 'greater',
format: 'depth32float'
},
fragment: {
targets: [{
format: 'rgba16float',
blend: {
color: {
srcFactor: 'one',
dstFactor: 'one'
},
alpha: {
srcFactor: 'one',
dstFactor: 'one'
}
}
}, {
format: 'r16float',
blend: {
color: {
srcFactor: 'zero',
dstFactor: 'one-minus-src'
},
alpha: {
srcFactor: 'one',
dstFactor: 'one-minus-src-alpha'
}
}
}]
}
});
};
publicAPI.createFinalEncoder = () => {
model.translucentFinalEncoder = vtkWebGPURenderEncoder.newInstance({
label: 'translucentFinal'
});
model.translucentFinalEncoder.setDescription({
colorAttachments: [{
view: null,
loadOp: 'load',
storeOp: 'store'
}]
});
model.translucentFinalEncoder.setReplaceShaderCodeFunction(pipeline => {
const fDesc = pipeline.getShaderDescription('fragment');
fDesc.addOutput('vec4<f32>', 'outColor');
fDesc.addBuiltinInput('vec4<f32>', '@builtin(position) fragPos');
let code = fDesc.getCode();
code = vtkWebGPUShaderCache.substitute(code, '//VTK::RenderEncoder::Impl', ['output.outColor = vec4<f32>(computedColor.rgb, computedColor.a);']).result;
fDesc.setCode(code);
});
model.translucentFinalEncoder.setPipelineHash('oitpf');
model.translucentFinalEncoder.setPipelineSettings({
primitive: {
cullMode: 'none'
},
fragment: {
targets: [{
format: 'rgba16float',
blend: {
color: {
srcFactor: 'src-alpha',
dstFactor: 'one-minus-src-alpha'
},
alpha: {
srcFactor: 'one',
dstFactor: 'one-minus-src-alpha'
}
}
}]
}
});
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
colorTextureView: null,
depthTextureView: null
};
// ----------------------------------------------------------------------------
function extend(publicAPI, model) {
let initialValues = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
Object.assign(model, DEFAULT_VALUES, initialValues);
// Build VTK API
vtkRenderPass.extend(publicAPI, model, initialValues);
macro.setGet(publicAPI, model, ['colorTextureView', 'depthTextureView']);
// Object methods
vtkWebGPUOrderIndependentTranslucentPass(publicAPI, model);
}
// ----------------------------------------------------------------------------
const newInstance = macro.newInstance(extend, 'vtkWebGPUOrderIndependentTranslucentPass');
// ----------------------------------------------------------------------------
var vtkWebGPUOrderIndepenentTranslucentPass = {
newInstance,
extend
};
export { vtkWebGPUOrderIndepenentTranslucentPass as default, extend, newInstance };