/// <reference types="dist" />
import { vec3, mat4 } from 'gl-matrix';
import * as Stats from 'stats.js';
import { GUI } from 'dat.gui';
/**
 * Interface as input of the `initWebGPU` function.
 */
export interface IWebGPUInitInput {
    /** HTML canvas element */
    canvas: HTMLCanvasElement;
    /** The GPU texture format */
    format?: GPUTextureFormat;
    /** MSAA count (1 or 4) */
    msaaCount?: number;
}
/**
 * Interface as output of the `initWebGPU` function.
 */
export interface IWebGPUInit {
    /** The GPU device */
    device?: GPUDevice;
    /** The GPU canvas context */
    context?: GPUCanvasContext;
    /** The GPU texture format */
    format?: GPUTextureFormat;
    /** The canvas size */
    size?: {
        width: number;
        height: number;
    };
    /** The background color for the scene */
    background?: {
        r: number;
        g: number;
        b: number;
        a: number;
    };
    /** MSAA count (1 or 4) */
    msaaCount?: number;
}
/**
 * This function is used to initialize the WebGPU apps. It returns the IWebGPUInit interface.
 *
 * @param input - The input argument of the `IWebGPUInitInput` interface type with default members:
 *
 * `input.format = navigator.gpu.getPreferredCanvasFormat()`
 *
 * `input.msaa.Count = 1`
 * @param deviceDescriptor - Describes a device request. `{}` means the default setting is used
 */
export declare const initWebGPU: (input: IWebGPUInitInput, deviceDescriptor?: GPUDeviceDescriptor) => Promise<IWebGPUInit>;
/** A string variable used to check whether your browser supports WebGPU or not.*/
export declare const checkWebGPUSupport: string;
/**
 * Interface as the output of a render pipeline.
 */
export interface IPipeline {
    /** The render pipeline array */
    pipelines?: GPURenderPipeline[];
    /** The compute pipeline array */
    csPipelines?: GPUComputePipeline[];
    /** The GPU texture array */
    gpuTextures?: GPUTexture[];
    /** The depth texture array */
    depthTextures?: GPUTexture[];
    /** The vertex buffer array */
    vertexBuffers?: GPUBuffer[];
    /** The uniform buffer array */
    uniformBuffers?: GPUBuffer[];
    /** The uniform bind group array */
    uniformBindGroups?: GPUBindGroup[];
    /** The number of vertices */
    numVertices?: number;
    /** The number of instances */
    numInstances?: number;
}
/** Interface as input of the `createRenderPipelineDescriptor` function. */
export interface IRenderPipelineInput {
    /** The IWebGPU interface */
    init: IWebGPUInit;
    /** The GPU primative topology with default `'triangle-list'` */
    primitiveType?: GPUPrimitiveTopology;
    /** The GPU index format (undefined for `'list'` primitives or `'uint32'` for `'strip'` primitives) */
    indexFormat?: GPUIndexFormat;
    /** The GPU cull mode - defines which polygon orientation will be culled */
    cullMode?: GPUCullMode;
    /** The boolean variable - indicates whether the render pipeline should include a depth stencial state or not */
    isDepthStencil?: boolean;
    /** The `buffers` attribute of the vertex state in a render pipeline descriptor */
    buffers?: Iterable<GPUVertexBufferLayout>;
    /** The WGSL shader that contains both vertex and fragment shaders */
    shader?: string;
    /** The WGSL vertex shader */
    vsShader?: string;
    /** The WGSL fragment shader */
    fsShader?: string;
    /** The entry point for the vertex shader. Default `'vs_main'`  */
    vsEntry?: string;
    /** The entry point for the fragment shader. Default `'fs_main'`  */
    fsEntry?: string;
}
/**
 * This function creates the render pipeline descriptor that will be used to create a render pipeline.
 *
 * @param input - The `input` argument is a type of the `IRenderPipelineInput` interface with the following default values:
 * `input.primitiveType`: `'triangle-list'`, `input.cullMode`: `'none'`, `input.isDepthStencil`: `true`,
 * `input.vsEntry`: `'vs_main'`,  `input.fsEntry`: `'fs_main'`. If `input.shader` is specified, then
 * `input.vsShader = input.shader` and `input.fsShader = input.shader`
 *
 * @param withFragment - Indicates whether the GPU fragment state should be included or not. Default value is `true`.
 * If it is set to `false`, the render pipeline will not produce any color attachment outputs. For example, we do not
 * need any color output when rendering shadows, so we can set this parameter to `false` in this case
 * @returns The render pipeline descriptor.
 */
export declare const createRenderPipelineDescriptor: (input: IRenderPipelineInput, withFragment?: boolean) => GPURenderPipelineDescriptor;
/**
 * This function create a compute pipeline descriptor that will be used to create a compute pipeline.
 * @param device GPU Device
 * @param csShader the WGSL compute shader
 * @param entry the entry point for teh compute shader
 * @returns the compute pipeline descriptor.
 */
export declare const createComputePipelineDescriptor: (device: GPUDevice, csShader: string, entry?: string) => GPUComputePipelineDescriptor;
/**
 * This function sets the `buffers` attribute of the vertex state in a render pipeline. In this function, the input argument
 * `formats` is a GPU vertex-format array. It can be specified as `'float32'`, `'float32x2'`,
 * `'float32x3'`, `'float32x4'`, etc., which correspond to the WGSL style in the shader `f32`, `vec2<f32>`,
 * `vec3<f32>`, `vec4<f32>`, etc. If the vertex data is stored in a separate buffer for each attribute such as position,
 * normal, and UV, you can simply provide only this input argument like `['float32x3', 'float32x3', 'float32x2']` and
 * ignore all the other optional arguments. In this case, the `setVertexBuffers` function will automatically
 * calculate the `offset`, `arrayStride`, and `shaderLocation` for each vertex attribute. Note that the `shaderLocation`
 * is set with an array filled with consecutive numbers like [0, 1, 2], which must match the  `@location` attribute specified
 * in the vertex shader. Otherwise, you need to manually specify the `shaderLocations` array argument.
 *
 * On the other hand, if you store the vertex data in a single buffer for all attributes (e.g., position, normal, and uv), you
 * will need to provide not only the vertex `formats` array, but also the `offsets` array. Here is an example
 * of a single buffer that stores the `position` (`vec3<f32>`), `normal` (`vec3<f32>`), and `uv` (`vec2<f32>`) data.
 * The corresponding  `arrayStride` will be 12, 12, and 8, and the `offsets` array will be [0, 12, 24].
 * In this case, you can set the `buffers` attribute by calling the function like this:
 *
 * `const bufs = setVertexBuffers(['float32x3', 'float32x3', 'float32x2'], [0, 12, 24]);`
 *
 * The above example assumes that all the vertex attributes (position, normal, and uv) stored in a
 * single buffer are used in the pipeline and vertex shader. What happens if not all the attributes in the buffer are needed.
 * For example, the pipeline and shader only need the `position` and `uv` data, but not the `normal` data. In this case,
 * in addition to the `formats` and `offsets` arguments, you will also need to specify the `totalArrayStride`
 * argument. The `arrayStride` for `position`, `normal`, and `uv` is 12, 12, and 8, respectively, so the
 * `totalArrayStride` = 12 + 12 + 8 = 32. Thus, we can create the `buffers` attribute using the following code
 *
 * `const bufs = setVertexBuffers(['float32x3', 'float32x2'], [0, 24], 32);`
 *
 * Note that the `offsets` array is set to [0, 24] rather than [0, 12], because the `uv` data starts after `position` and
 * `normal` data, while the `normal` data is still stored in the buffer even though it is not used in this example.
 *
 * @param formats GPU vertex format array with each element specifying the `GPUVertexFormat` of teh attribute.
 * @param offsets The offset array that is optional. The offset, in bytes, is counted from the beginning of the element to the data
 * for the attribute. Note that the offset must be a multiple of the minimum of 4 and sizeof the `attrib.format`.
 * @param totalArrayStride The stride, in bytes, between elements of the array. This is an optional argument.
 * @param shaderLocations The numeric location associated with the attribute, such as position, normal, or uv, which will
 * correspond with a `@location` attribute declared in the vertex shader. This is an optional argument.
 * @returns An array of GPU vertex buffer layout.
 */
export declare const setVertexBuffers: (formats: GPUVertexFormat[], offsets?: number[], totalArrayStride?: number, shaderLocations?: number[]) => Iterable<GPUVertexBufferLayout>;
/** Interface as input of the `createRenderPassDescriptor` function. */
export interface IRenderPassInput {
    /** The IWebGPUInit interface */
    init?: IWebGPUInit;
    /** The GPU texture view */
    textureView?: GPUTextureView;
    /** The depth texture view */
    depthView?: GPUTextureView;
}
/**
 * This function creates the render pass descriptor that will be used to create a render pass with various options.
 * The returned desciptor will include a depth-stencil attachment if the depth texture view is provided via the input
 * interface `IRenderPassInput`. Otherwise, the depth stencil attachment will not be defined. The argument
 * `withColorAttachment` indicates whether the descriptor should contain color attachments or not. In addition, you can
 * specify the MSAA count parameter.
 * @param input The type of interface `IRenderPassInput`
 * @param withColorAttachment Indicates whether the descriptor should contain color attachments or not
 */
export declare const createRenderPassDescriptor: (input: IRenderPassInput, withColorAttachment?: boolean) => GPURenderPassDescriptor;
/** The enumeration for specifying the type of a GPU buffer. */
export declare enum BufferType {
    /** Uniform buffer */
    Uniform = 0,
    /** Vertex buffer */
    Vertex = 1,
    /** Index buffer */
    Index = 2,
    /** Storage buffer */
    Storage = 3,
    /** vertex-Storage buffer */
    VertexStorage = 4,
    /** Index-Storage buffer */
    IndexStorage = 5,
    /** Indirect buffer */
    Indirect = 6,
    /** Indirect-Storage buffer */
    IndirectStorage = 7,
    /** Read buffer */
    Read = 8,
    /** Write buffer */
    Write = 9
}
/**
 * This function updates the vertex buffers when the vertex data is changed by varying some parameters by the user.
 * Let's take the UV sphere as an example. A UV sphere can have three parameters: radius, u-segments, and v-segments.
 * Varying the radius parameter only changes the data values but not the buffer size, while warying the u- (or v-)
 * segments parameter will change both the data values and buffer size. In the former case, we can write the
 * new data directly into the original buffers; while in the latter case, we have to destroy the original buffers and recreate
 * the new buffers with new buffer size, and then write the new data into the newly created buffers. Here, we check whether the buffer
 * size is changed or not by comparing the length of the original data (called `origNumVertices`) with that of the new data.
 * @param device GPU device
 * @param p Interface of `IPipeline`
 * @param data An array of vertex data. Note that this array should include the `index` data. For example, if a render pipeline
 * has `position`, `normal`, and `uv`, then this `data` array should defined by
 *
 * `const data = [dat.positions, dat.normals, dat.uvs, dat.indices];`
 *
 * Of course, for this data array, you also need to define corresponding vertex buffer array in the render pipeline:
 *
 * `p.vertexBuffers = [positonBuffer, normalBuffer, uvBuffer, indexBuffer];`
 *
 * If the data is generated in such a way that the vertex data contains all attributes (`position`, `normal`, `uv` ) and  it is
 * stored in a single buffer, we can specify the `data` array using the code:
 *
 * `const data = [dat.vertices, dat.indices];`
 *
 * and corresponding vertex buffer array:
 *
 * `p.vertexBuffers = [vertexBuffer, indexBuffer];`
 *
 * @param origNumVertices The data length of the first element in the original `data` array.
 */
export declare const updateVertexBuffers: (device: GPUDevice, p: IPipeline, data: any[], origNumVertices: number) => void;
/**
 * This function can be used to create vertex, uniform, or storage GPU buffer. The default is a uniform buffer.
 * @param device GPU device
 * @param bufferSize Buffer size.
 * @param bufferType Of the `BufferType` enum.
 */
export declare const createBuffer: (device: GPUDevice, bufferSize: number, bufferType?: BufferType) => GPUBuffer;
/**
 * This function creats a GPU buffer with data to initialize it. If the input data is a type of `Float32Array`
 * or `Float64Array`, it returns a vertex, uniform, or storage buffer specified by the enum `bufferType`. Otherwise,
 * if the input data has a `Uint16Array` or `Uint32Array`, this function will return an index buffer.
 * @param device GPU device
 * @param data Input data that should be one of four data types: `Float32Array`, `Float64Array`, `Uint16Array`, and
 * `Uint32Array`
 * @param bufferType Type of enum `BufferType`. It is used to specify the type of the returned buffer. The default is
 * vertex buffer
 */
export declare const createBufferWithData: (device: GPUDevice, data: any, bufferType?: BufferType) => GPUBuffer;
/**
 * This function is used to create a GPU bind group that defines a set of resources to be bound together in a
 * group and how the resources are used in shader stages. It accepts GPU device, GPU bind group layout, uniform
 * buffer array, and the other GPU binding resource array as its input arguments. If both the buffer and other
 * resource arrays have none zero elements, you need to place the buffer array ahead of the other resource array.
 * Make sure that the order of buffers and other resources is consistent with the `@group @binding` attributes
 * defined in the shader code.
 * @param device GPU device
 * @param layout GPU bind group layout that defines the interface between a set of resources bound in a GPU bind
 * group and their accessibility in shader stages.
 * @param buffers The uniform buffer array
 * @param otherResources The other resource array, which can include `GPUSampler`, `GPUTextureView`,
 * `GPUExternalTexture`, etc.
 */
export declare const createBindGroup: (device: GPUDevice, layout: GPUBindGroupLayout, buffers?: GPUBuffer[], otherResources?: GPUBindingResource[]) => GPUBindGroup;
/**
 * This function is used to read data from a GPU buffer. It can be used for debugging code.
 * @param device GPU device
 * @param buffer GPU buffer
 * @param byteLength the size of the GPU buffer
 * @returns data from the GPU buffer
 */
export declare const readBufferData: (device: GPUDevice, buffer: GPUBuffer, byteLength: number) => Promise<ArrayBuffer>;
/**
 * This function create a GPU texture for MSAA (or sample) count = 4.
 * @param init The `IWebGPUInit` interface
 */
export declare const createMultiSampleTexture: (init: IWebGPUInit) => GPUTexture;
/**
 * This function creates a GPU texture used in the depth stencil attachment in the render pass descriptor.
 * @param init The `IWebGPUInit` interface
 * @param depthFormat GPU texture format, defaulting to `'depth24plus'`
 */
export declare const createDepthTexture: (init: IWebGPUInit, depthFormat?: GPUTextureFormat) => GPUTexture;
/** Interface as output of the `createViewTransform`. */
export interface IViewOutput {
    /** View matrix */
    viewMat?: mat4;
    /** Camera options used to create a camera */
    cameraOptions: ICameraOptions;
}
/** Interface used to create a camera. */
export interface ICameraOptions {
    /** Eye or view position */
    eye?: vec3;
    /** Look at direction */
    center?: vec3;
    /** Maximum zooming range */
    zoomMax?: number;
    /** Zooming speed */
    zoomSpeed?: number;
}
/**
 * This function creates a model matrix of the `mat4` type.
 * @param translation Translation along `x` (`tx`), `y` (`ty`), and `z` (`tz`) directions, which can be specified
 * by `[tx, ty, tz]`, defaulting to [0, 0, 0]
 * @param rotation Rotation along `x` (`rx`), `y` (`ry`), and `z` (`rz`) axes, which can be specified by
 * `[rx, ry, rz]`, defaulting to [0, 0, 0]
 * @param scale Scaling along `x` (`sx`), `y` (`sy`), and `z` (`sz`) directions, which can be specified by
 * `[sx, sy, sz]`, defaulting to [1, 1, 1]
 */
export declare const createModelMat: (translation?: vec3, rotation?: vec3, scale?: vec3) => mat4;
/**
 * This functions creates a view matrix of the `mat4` type and the camera options. It returns the interface
 * `IViewOutput`.
 * @param cameraPos Camera position, defaulting to [2, 2, 4]
 * @param lookDir Look at direction, defaulting to [0, 0, 0]
 * @param upDir Look up direction, defaulting to [0, 1, 0], i.e., the y direction is the look up direction
 */
export declare const createViewTransform: (cameraPos?: vec3, lookDir?: vec3, upDir?: vec3) => IViewOutput;
/**
 * This function creates a projection matrix of the `mat4` type.
 * @param aspectRatio Aspect ratio, defaulting to 1
 */
export declare const createProjectionMat: (aspectRatio?: number) => mat4;
/**
 * This function creates a model-view-projection matrix of the `mat4` type by combining the model
 * matrix, view matrix, and projection matrix together.
 * @param modelMat Model matrix
 * @param viewMat View matrix
 * @param projectMat Projection matrix
 */
export declare const combineMvpMat: (modelMat: mat4, viewMat: mat4, projectionMat: mat4) => mat4;
/**
* This function creates a view-projection matrix of the `mat4` type by combining the
 * view matrix and projection matrix together.
 * @param viewMat View matrix
 * @param projectMat Projection matrix
 */
export declare const combineVpMat: (viewMat: mat4, projectionMat: mat4) => mat4;
/**
 * This function create a normal matrix of the `mat4` type by inverting and transposing a model matrix.
 * @param modelMat Model matrix
 */
export declare const createNormalMat: (modelMat: mat4) => mat4;
/**
 * This function creates a camera using a `npm` package `3d-view-controls`. The returned easy to use camera
 * allows you to interact with graphics objects in the scene using mouse, such as pan, rotate, and zoom in/out
 * the objects.
 * @param canvas HTML `canvas` element
 * @param options Camera options, type of the `ICameraOptions`
 */
export declare const getCamera: (canvas: HTMLCanvasElement, options: ICameraOptions) => any;
/**
 * This function creates a texture and a sampler from an image file, and returns an object that contains
 * attributes `texture` and `sampler`.
 * @param device GPU device
 * @param imageFile the path of the image file to load
 * @param addressModeU (optional) the addressing model for the `u` texture coordinate, defaulting to `'repeat'`
 * @param addressModeV (optional) the addressing model for the `v` texture coordinate, defaulting to `'repeat'`
 */
export declare const createImageTexture: (device: GPUDevice, imageFile: string, addressModeU?: string, addressModeV?: string) => Promise<{
    texture: GPUTexture;
    sampler: GPUSampler;
}>;
/**
 * This function creates a texture and a sampler from a 2D canvas, and returns an object that contains
 * attributes `texture` and `sampler`.
 * @param device GPU device
 * @param canvas the HTML canvas element
 * @param addressModeU (optional) the addressing model for the `u` texture coordinate, defaulting to `'repeat'`
 * @param addressModeV (optional) the addressing model for the `v` texture coordinate, defaulting to `'repeat'`
 */
export declare const createCanvasTexture: (device: GPUDevice, canvas: HTMLCanvasElement, addressModeU?: string, addressModeV?: string) => Promise<{
    texture: GPUTexture;
    sampler: GPUSampler;
}>;
/**
 * This utility function convert `hex` color string to `rgba` color array of the `Float32Array` type.
 * @param hex Hex color string
 */
export declare const hex2rgb: (hex: string) => Float32Array;
/**
 * This utility function creates a new `dat-gui` with a specified dom element id. This function is based on the `npm`
 * package called `dat.gui`. the `dat.gui` library is a lightweight graphical user interface for changing parameters
 * by the user.
 * @param guiDomId HTML dom element id, defaulting to `'gui'`
 */
export declare const getDatGui: (guiDomId?: string) => GUI;
/**
 * This utility function creates a new `stats` panel on the scene with a specified dom element id. This function is based on
 * the `npm` package called `stats.js`. It can be used to monitor the performance of your apps, such as framerate, rendering
 * time, and memory usage.
 * @param statsDomId
 */
export declare const getStats: (statsDomId?: string) => Stats;