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* Copyright 2020 Cognite AS
*/
import glsl from 'glslify';
import * as THREE from 'three';
import { RenderMode } from '../materials';
import { CadNode } from '../cad/CadNode';
const vertexShaderAntialias = glsl(require('../../../glsl/post-processing/fxaa.vert').default);
const fragmentShaderAntialias = glsl(require('../../../glsl/post-processing/fxaa.frag').default);
const passThroughVertexShader = glsl(require('../../../glsl/post-processing/passthrough.vert').default);
const ssaoShader = glsl(require('../../../glsl/post-processing/ssao.frag').default);
const ssaoFinalShader = glsl(require('../../../glsl/post-processing/ssao-final.frag').default);
interface Uniforms {
[uniform: string]: THREE.IUniform;
}
function setupRenderingPass(options: {
uniforms: Uniforms;
vertexShader: string;
fragmentShader: string;
}): THREE.Scene {
const scene = new THREE.Scene();
const material = new THREE.ShaderMaterial({
uniforms: options.uniforms,
vertexShader: options.vertexShader,
fragmentShader: options.fragmentShader,
depthWrite: false
});
const quad = new THREE.Mesh(new THREE.PlaneBufferGeometry(2, 2), material);
quad.frustumCulled = false;
scene.add(quad);
return scene;
}
interface SceneInfo {
scene: THREE.Scene;
uniforms: Uniforms;
}
function createSSAOFinalScene(diffuseTexture: THREE.Texture, ssaoTexture: THREE.Texture): SceneInfo {
const uniforms = {
tDiffuse: { value: diffuseTexture },
ssaoTexture: { value: ssaoTexture },
size: { value: new THREE.Vector2() }
};
const scene = setupRenderingPass({
uniforms,
vertexShader: passThroughVertexShader,
fragmentShader: ssaoFinalShader
});
return { scene, uniforms };
}
function createAntialiasScene(diffuseTexture: THREE.Texture): SceneInfo {
const uniforms = {
tDiffuse: { value: diffuseTexture },
resolution: { value: new THREE.Vector2() }
};
const scene = setupRenderingPass({
uniforms,
vertexShader: vertexShaderAntialias,
fragmentShader: fragmentShaderAntialias
});
return { scene, uniforms };
}
const quadCamera = new THREE.OrthographicCamera(-1, 1, 1, -1, 0, 1);
export interface Pass {
render: (
renderer: THREE.WebGLRenderer,
scene: THREE.Scene,
camera: THREE.PerspectiveCamera,
pass?: SsaoPassType
) => void;
uniforms: Uniforms;
}
function lerp(value1: number, value2: number, amount: number) {
amount = amount < 0 ? 0 : amount;
amount = amount > 1 ? 1 : amount;
return value1 + (value2 - value1) * amount;
}
function createKernel() {
const kernelSize = 32;
const result = [];
for (let i = 0; i < kernelSize; i++) {
const sample = new THREE.Vector3();
while (sample.length() < 0.5) {
// Ensure some distance in samples
sample.x = Math.random() * 2 - 1;
sample.y = Math.random() * 2 - 1;
sample.z = Math.random();
}
sample.normalize();
let scale = i / kernelSize;
scale = lerp(0.1, 1, scale * scale);
sample.multiplyScalar(scale);
result.push(sample);
}
return result;
}
function createNoiseTexture() {
const width = 128;
const height = 128;
const size = width * height;
const data = new Float32Array(size * 4);
for (let i = 0; i < size; i++) {
const stride = i * 4;
const x = Math.random() * 2 - 1;
const y = Math.random() * 2 - 1;
const z = Math.random() * 2 - 1;
data[stride] = x;
data[stride + 1] = y;
data[stride + 2] = z;
data[stride + 3] = 1;
}
const result = new THREE.DataTexture(data, width, height, THREE.RGBAFormat, THREE.FloatType);
result.wrapS = THREE.RepeatWrapping;
result.wrapT = THREE.RepeatWrapping;
return result;
}
export enum SsaoPassType {
Regular = 'Regular',
Ssao = 'Ssao',
SsaoFinal = 'SsaoFinal',
Antialias = 'Antialias'
}
export function createSsaoPass(): Pass {
const modelTarget = new THREE.WebGLRenderTarget(0, 0); // adjust size later
modelTarget.depthBuffer = true;
modelTarget.depthTexture = new THREE.DepthTexture(0, 0); // size will be set by the first render
modelTarget.depthTexture.type = THREE.UnsignedIntType;
const ssaoTarget = new THREE.WebGLRenderTarget(0, 0); // adjust size later
ssaoTarget.depthBuffer = false;
ssaoTarget.stencilBuffer = false;
const ssaoFinalTarget = new THREE.WebGLRenderTarget(0, 0); // adjust size later
ssaoFinalTarget.depthBuffer = false;
ssaoFinalTarget.stencilBuffer = false;
const normalTarget = new THREE.WebGLRenderTarget(0, 0, {
minFilter: THREE.LinearFilter,
magFilter: THREE.LinearFilter,
format: THREE.RGBFormat,
stencilBuffer: false
});
const kernel = createKernel();
const noiseTexture = createNoiseTexture();
const ssaoUniforms = {
tDiffuse: { value: modelTarget.texture },
tDepth: { value: modelTarget.depthTexture },
tNoise: { value: noiseTexture },
resolution: { value: new THREE.Vector2() },
kernel: { value: kernel },
kernelRadius: { value: 1.0 },
minDistance: { value: 0.0001 },
maxDistance: { value: 0.1 },
cameraNear: { value: 0.0 }, // set during rendering
cameraFar: { value: 0.0 }, // set during rendering
cameraProjectionMatrix: { value: new THREE.Matrix4() },
cameraInverseProjectionMatrix: { value: new THREE.Matrix4() }
};
const ssaoScene = setupRenderingPass({
uniforms: ssaoUniforms,
vertexShader: passThroughVertexShader,
fragmentShader: ssaoShader
});
const { scene: ssaoFinalScene, uniforms: ssaoFinalUniforms } = createSSAOFinalScene(
modelTarget.texture,
ssaoTarget.texture
);
const { scene: antiAliasScene, uniforms: antiAliasUniforms } = createAntialiasScene(ssaoFinalTarget.texture);
const setSize = (width: number, height: number) => {
modelTarget.setSize(width, height);
normalTarget.setSize(width, height);
antiAliasUniforms.resolution.value.set(width, height);
ssaoTarget.setSize(width, height);
ssaoUniforms.resolution.value.set(width, height);
ssaoFinalTarget.setSize(width, height);
ssaoFinalUniforms.size.value.set(width, height);
};
const rendererSize = new THREE.Vector2();
const render = (
renderer: THREE.WebGLRenderer,
scene: THREE.Scene,
camera: THREE.PerspectiveCamera,
pass?: SsaoPassType
) => {
renderer.getSize(rendererSize);
if (modelTarget.width !== rendererSize.x || modelTarget.height !== rendererSize.y) {
setSize(rendererSize.x, rendererSize.y);
}
pass = pass || SsaoPassType.Antialias;
{
// Regular pass
renderer.setClearColor(new THREE.Color(0x7777ff), 0.0);
renderer.setRenderTarget(modelTarget);
// TODO ordering
renderer.clear(true, true, false);
if (pass === SsaoPassType.Regular) {
renderer.setRenderTarget(null);
}
scene.traverseVisible(object => {
if (object.type !== 'CadNode') {
return;
}
const cadNode = object as CadNode;
cadNode.renderMode = RenderMode.PackColorAndNormal;
});
renderer.render(scene, camera);
scene.traverseVisible(object => {
if (object.type !== 'CadNode') {
return;
}
const cadNode = object as CadNode;
cadNode.renderMode = RenderMode.Color;
});
if (pass === SsaoPassType.Regular) {
return;
}
}
{
// SSAO pass
ssaoUniforms.cameraNear.value = camera.near;
ssaoUniforms.cameraFar.value = camera.far;
ssaoUniforms.cameraProjectionMatrix.value = camera.projectionMatrix;
ssaoUniforms.cameraInverseProjectionMatrix.value = camera.projectionMatrixInverse;
renderer.setRenderTarget(ssaoTarget);
if (pass === SsaoPassType.Ssao) {
renderer.setRenderTarget(null);
}
renderer.render(ssaoScene, quadCamera);
if (pass === SsaoPassType.Ssao) {
return;
}
}
{
// SSAO final pass
renderer.setRenderTarget(ssaoFinalTarget);
if (pass === SsaoPassType.SsaoFinal) {
renderer.setRenderTarget(null);
}
renderer.render(ssaoFinalScene, quadCamera);
if (pass === SsaoPassType.SsaoFinal) {
return;
}
}
{
// FXAA pass
renderer.setRenderTarget(null);
renderer.render(antiAliasScene, quadCamera);
}
};
return {
render,
uniforms: ssaoUniforms
};
}
export class SsaoEffect {
private readonly _ssaoPass: Pass;
constructor() {
this._ssaoPass = createSsaoPass();
}
get kernelRadius() {
return this._ssaoPass.uniforms.kernelRadius.value;
}
set kernelRadius(value: number) {
this._ssaoPass.uniforms.kernelRadius.value = value;
}
get minDistance() {
return this._ssaoPass.uniforms.minDistance.value;
}
set minDistance(value: number) {
this._ssaoPass.uniforms.minDistance.value = value;
}
get maxDistance() {
return this._ssaoPass.uniforms.maxDistance.value;
}
set maxDistance(value: number) {
this._ssaoPass.uniforms.maxDistance.value = value;
}
render(renderer: THREE.WebGLRenderer, scene: THREE.Scene, camera: THREE.PerspectiveCamera, pass?: SsaoPassType) {
this._ssaoPass.render(renderer, scene, camera, pass);
}
}
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