app/node_modules/@babylonjs/core/Engines/Extensions/engine.multiview.js

import { Camera } from "../../Cameras/camera.js";
import { Engine } from "../../Engines/engine.js";
import { Scene } from "../../scene.js";
import { InternalTexture, InternalTextureSource } from "../../Materials/Textures/internalTexture.js";
import { Matrix, TmpVectors } from "../../Maths/math.vector.js";
import { UniformBuffer } from "../../Materials/uniformBuffer.js";
import { MultiviewRenderTarget } from "../../Materials/Textures/MultiviewRenderTarget.js";
import { Frustum } from "../../Maths/math.frustum.js";
Engine.prototype.createMultiviewRenderTargetTexture = function (width, height, colorTexture, depthStencilTexture) {
    const gl = this._gl;
    if (!this.getCaps().multiview) {
        // eslint-disable-next-line no-throw-literal
        throw "Multiview is not supported";
    }
    const rtWrapper = this._createHardwareRenderTargetWrapper(false, false, { width, height });
    rtWrapper._framebuffer = gl.createFramebuffer();
    const internalTexture = new InternalTexture(this, InternalTextureSource.Unknown, true);
    internalTexture.width = width;
    internalTexture.height = height;
    internalTexture.isMultiview = true;
    if (!colorTexture) {
        colorTexture = gl.createTexture();
        gl.bindTexture(gl.TEXTURE_2D_ARRAY, colorTexture);
        gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, 2);
    }
    rtWrapper._colorTextureArray = colorTexture;
    if (!depthStencilTexture) {
        depthStencilTexture = gl.createTexture();
        gl.bindTexture(gl.TEXTURE_2D_ARRAY, depthStencilTexture);
        gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.DEPTH24_STENCIL8, width, height, 2);
    }
    rtWrapper._depthStencilTextureArray = depthStencilTexture;
    internalTexture.isReady = true;
    rtWrapper.setTextures(internalTexture);
    rtWrapper._depthStencilTexture = internalTexture;
    return rtWrapper;
};
Engine.prototype.bindMultiviewFramebuffer = function (_multiviewTexture) {
    const multiviewTexture = _multiviewTexture;
    const gl = this._gl;
    const ext = this.getCaps().oculusMultiview || this.getCaps().multiview;
    this.bindFramebuffer(multiviewTexture, undefined, undefined, undefined, true);
    gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, multiviewTexture._framebuffer);
    if (multiviewTexture._colorTextureArray && multiviewTexture._depthStencilTextureArray) {
        if (this.getCaps().oculusMultiview) {
            ext.framebufferTextureMultisampleMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, multiviewTexture._colorTextureArray, 0, multiviewTexture.samples, 0, 2);
            ext.framebufferTextureMultisampleMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, multiviewTexture._depthStencilTextureArray, 0, multiviewTexture.samples, 0, 2);
        }
        else {
            ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, multiviewTexture._colorTextureArray, 0, 0, 2);
            ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, multiviewTexture._depthStencilTextureArray, 0, 0, 2);
        }
    }
    else {
        // eslint-disable-next-line no-throw-literal
        throw "Invalid multiview frame buffer";
    }
};
Engine.prototype.bindSpaceWarpFramebuffer = function (_spaceWarpTexture) {
    const spaceWarpTexture = _spaceWarpTexture;
    const gl = this._gl;
    const ext = this.getCaps().oculusMultiview || this.getCaps().multiview;
    this.bindFramebuffer(spaceWarpTexture, undefined, undefined, undefined, true);
    gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, spaceWarpTexture._framebuffer);
    if (spaceWarpTexture._colorTextureArray && spaceWarpTexture._depthStencilTextureArray) {
        ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, spaceWarpTexture._colorTextureArray, 0, 0, 2);
        ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.DEPTH_ATTACHMENT, spaceWarpTexture._depthStencilTextureArray, 0, 0, 2);
    }
    else {
        throw new Error("Invalid Space Warp framebuffer");
    }
};
Camera.prototype._useMultiviewToSingleView = false;
Camera.prototype._multiviewTexture = null;
Camera.prototype._resizeOrCreateMultiviewTexture = function (width, height) {
    if (!this._multiviewTexture) {
        this._multiviewTexture = new MultiviewRenderTarget(this.getScene(), { width: width, height: height });
    }
    else if (this._multiviewTexture.getRenderWidth() != width || this._multiviewTexture.getRenderHeight() != height) {
        this._multiviewTexture.dispose();
        this._multiviewTexture = new MultiviewRenderTarget(this.getScene(), { width: width, height: height });
    }
};
function createMultiviewUbo(engine, name) {
    const ubo = new UniformBuffer(engine, undefined, true, name);
    ubo.addUniform("viewProjection", 16);
    ubo.addUniform("viewProjectionR", 16);
    ubo.addUniform("view", 16);
    ubo.addUniform("projection", 16);
    ubo.addUniform("vEyePosition", 4);
    return ubo;
}
const currentCreateSceneUniformBuffer = Scene.prototype.createSceneUniformBuffer;
Scene.prototype._transformMatrixR = Matrix.Zero();
Scene.prototype._multiviewSceneUbo = null;
Scene.prototype._createMultiviewUbo = function () {
    this._multiviewSceneUbo = createMultiviewUbo(this.getEngine(), "scene_multiview");
};
Scene.prototype.createSceneUniformBuffer = function (name) {
    if (this._multiviewSceneUbo) {
        return createMultiviewUbo(this.getEngine(), name);
    }
    return currentCreateSceneUniformBuffer.bind(this)(name);
};
Scene.prototype._updateMultiviewUbo = function (viewR, projectionR) {
    if (viewR && projectionR) {
        viewR.multiplyToRef(projectionR, this._transformMatrixR);
    }
    if (viewR && projectionR) {
        viewR.multiplyToRef(projectionR, TmpVectors.Matrix[0]);
        Frustum.GetRightPlaneToRef(TmpVectors.Matrix[0], this._frustumPlanes[3]); // Replace right plane by second camera right plane
    }
    if (this._multiviewSceneUbo) {
        this._multiviewSceneUbo.updateMatrix("viewProjection", this.getTransformMatrix());
        this._multiviewSceneUbo.updateMatrix("viewProjectionR", this._transformMatrixR);
        this._multiviewSceneUbo.updateMatrix("view", this._viewMatrix);
        this._multiviewSceneUbo.updateMatrix("projection", this._projectionMatrix);
    }
};
Scene.prototype._renderMultiviewToSingleView = function (camera) {
    // Multiview is only able to be displayed directly for API's such as webXR
    // This displays a multiview image by rendering to the multiview image and then
    // copying the result into the sub cameras instead of rendering them and proceeding as normal from there
    // Render to a multiview texture
    camera._resizeOrCreateMultiviewTexture(camera._rigPostProcess && camera._rigPostProcess && camera._rigPostProcess.width > 0 ? camera._rigPostProcess.width : this.getEngine().getRenderWidth(true), camera._rigPostProcess && camera._rigPostProcess && camera._rigPostProcess.height > 0 ? camera._rigPostProcess.height : this.getEngine().getRenderHeight(true));
    if (!this._multiviewSceneUbo) {
        this._createMultiviewUbo();
    }
    camera.outputRenderTarget = camera._multiviewTexture;
    this._renderForCamera(camera);
    camera.outputRenderTarget = null;
    // Consume the multiview texture through a shader for each eye
    for (let index = 0; index < camera._rigCameras.length; index++) {
        const engine = this.getEngine();
        this._activeCamera = camera._rigCameras[index];
        engine.setViewport(this._activeCamera.viewport);
        if (this.postProcessManager) {
            this.postProcessManager._prepareFrame();
            this.postProcessManager._finalizeFrame(this._activeCamera.isIntermediate);
        }
    }
};
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