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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 | 1x 1x 1x | import macro from 'vtk.js/Sources/macros';
import vtkWebGPUTexture from 'vtk.js/Sources/Rendering/WebGPU/Texture';
import vtkWebGPURenderEncoder from 'vtk.js/Sources/Rendering/WebGPU/RenderEncoder';
import vtkWebGPUShaderCache from 'vtk.js/Sources/Rendering/WebGPU/ShaderCache';
import vtkRenderPass from 'vtk.js/Sources/Rendering/SceneGraph/RenderPass';
import vtkWebGPUFullScreenQuad from 'vtk.js/Sources/Rendering/WebGPU/FullScreenQuad';
// ----------------------------------------------------------------------------
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,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
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);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(
extend,
'vtkWebGPUOrderIndependentTranslucentPass'
);
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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