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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {Tracklet} from '@/common/tracker/Tracker';
/**
* util funtion to generate a WebGL texture using a look up table.
* @param {WebGL2RenderingContext} gl - The WebGL2 rendering context.
* @param {number} lutSize - The size of the LUT in each dimension.
* @param {Uint8Array} lutData - The LUT data as an array of unsigned 8-bit integers.
* @returns {WebGLTexture} - The WebGL texture object representing the loaded LUT.
*/
export function load3DLUT(
gl: WebGL2RenderingContext,
lutSize: number,
lutData: Uint8Array,
) {
const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_3D, texture);
gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE);
// Pixel storage modes must be set to default for 3D textures
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
gl.texImage3D(
gl.TEXTURE_3D,
0,
gl.RGBA,
lutSize,
lutSize,
lutSize,
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
lutData,
);
gl.bindTexture(gl.TEXTURE_3D, null);
return texture;
}
/**
* Generates a 3D lookup table (LUT) data with random RGBA values.
* @param {number} lutSize - The size of the LUT in each dimension.
* @returns {Uint8Array} - The LUT data as an array of unsigned 8-bit integers.
*/
export function generateLUTDATA(lutSize: number) {
const totalEntries = lutSize * lutSize * lutSize; // 3D LUT nodes
const lutData = new Uint8Array(totalEntries * 4); // Each entry has an RGBA value
for (let i = 0; i < totalEntries; i++) {
lutData[i * 4 + 0] = Math.floor(Math.random() * 256); // Random red value
lutData[i * 4 + 1] = Math.floor(Math.random() * 256); // Random green value
lutData[i * 4 + 2] = Math.floor(Math.random() * 256); // Random blue value
lutData[i * 4 + 3] = 1; // alpha value
}
return lutData;
}
/**
* Normalizes the bounds of a rectangle defined by two points (A and B) within a given width and height.
* @param {number[]} pointA - The coordinates of the first point defining the rectangle.
* @param {number[]} pointB - The coordinates of the second point defining the rectangle.
* @param {number} width - The width of the canvas or container where the rectangle is drawn.
* @param {number} height - The height of the canvas or container where the rectangle is drawn.
* @returns {number[]} - An array containing the normalized x and y coordinates of the rectangle's corners.
*/
export function normalizeBounds(
pointA: number[],
pointB: number[],
width: number,
height: number,
) {
return [
pointA[0] / width,
pointA[1] / height,
pointB[0] / width,
pointB[1] / height,
];
}
/**
* Pre-allocates a specified number of 2D textures for use in WebGL2 rendering.
* @param {WebGL2RenderingContext} gl - The WebGL2 rendering context.
* @param {number} numTextures - The number of textures to be pre-allocated.
* @returns {WebGLTexture[]} - An array of WebGL textures, each pre-allocated and ready for use.
*/
export function preAllocateTextures(
gl: WebGL2RenderingContext,
numTextures: number,
) {
const maskTextures = [];
for (let i = 0; i < numTextures; i++) {
const maskTexture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, maskTexture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
maskTextures.push(maskTexture);
}
return maskTextures as WebGLTexture[];
}
/**
* Finds the index of a Tracklet object within an array based on its unique identifier.
* @param objects - The array of Tracklet objects to search within.
* @param id - The unique identifier of the Tracklet object to find.
* @returns The index of the `Tracklet` object with the specified `id` in the `objects` array.
*/
export function findIndexByTrackletId(id: number, objects: Tracklet[]): number {
return objects.findIndex(obj => obj.id === id);
}
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