// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { decodeTextureFormat } from '@luma.gl/core';
import { GL } from '@luma.gl/constants';
import { getWebGLExtension } from "../../context/helpers/webgl-extensions.js";
import { getGLFromVertexType } from "./vertex-formats.js";
/* eslint-disable camelcase */
// TEXTURE FEATURES
// Define local device feature strings to optimize minification
const texture_compression_bc = 'texture-compression-bc';
const texture_compression_astc = 'texture-compression-astc';
const texture_compression_etc2 = 'texture-compression-etc2';
const texture_compression_etc1_webgl = 'texture-compression-etc1-webgl';
const texture_compression_pvrtc_webgl = 'texture-compression-pvrtc-webgl';
const texture_compression_atc_webgl = 'texture-compression-atc-webgl';
const float32_renderable = 'float32-renderable-webgl';
const float16_renderable = 'float16-renderable-webgl';
const rgb9e5ufloat_renderable = 'rgb9e5ufloat_renderable-webgl';
const snorm8_renderable = 'snorm8-renderable-webgl';
const norm16_renderable = 'norm16-renderable-webgl';
const snorm16_renderable = 'snorm16-renderable-webgl';
const float32_filterable = 'float32-filterable';
const float16_filterable = 'float16-filterable-webgl';
// Define local webgl extension strings to optimize minification
const X_S3TC = 'WEBGL_compressed_texture_s3tc'; // BC1, BC2, BC3
const X_S3TC_SRGB = 'WEBGL_compressed_texture_s3tc_srgb'; // BC1, BC2, BC3
const X_RGTC = 'EXT_texture_compression_rgtc'; // BC4, BC5
const X_BPTC = 'EXT_texture_compression_bptc'; // BC6, BC7
const X_ETC2 = 'WEBGL_compressed_texture_etc'; // Renamed from 'WEBGL_compressed_texture_es3'
const X_ASTC = 'WEBGL_compressed_texture_astc';
const X_ETC1 = 'WEBGL_compressed_texture_etc1';
const X_PVRTC = 'WEBGL_compressed_texture_pvrtc';
const X_ATC = 'WEBGL_compressed_texture_atc';
// Define local webgl extension strings to optimize minification
const EXT_texture_norm16 = 'EXT_texture_norm16';
const EXT_render_snorm = 'EXT_render_snorm';
const EXT_color_buffer_float = 'EXT_color_buffer_float';
// prettier-ignore
export const TEXTURE_FEATURES = {
    'float32-renderable-webgl': ['EXT_color_buffer_float'],
    'float16-renderable-webgl': ['EXT_color_buffer_half_float'],
    'rgb9e5ufloat_renderable-webgl': ['WEBGL_render_shared_exponent'],
    'snorm8-renderable-webgl': [EXT_render_snorm],
    'norm16-renderable-webgl': [EXT_texture_norm16],
    'snorm16-renderable-webgl': [EXT_texture_norm16, EXT_render_snorm],
    'float32-filterable': ['OES_texture_float_linear'],
    'float16-filterable-webgl': ['OES_texture_half_float_linear'],
    'texture-filterable-anisotropic-webgl': ['EXT_texture_filter_anisotropic'],
    'texture-blend-float-webgl': ['EXT_float_blend'],
    'texture-compression-bc': [X_S3TC, X_S3TC_SRGB, X_RGTC, X_BPTC],
    // 'texture-compression-bc3-srgb-webgl': [X_S3TC_SRGB],
    // 'texture-compression-bc3-webgl': [X_S3TC],
    'texture-compression-bc5-webgl': [X_RGTC],
    'texture-compression-bc7-webgl': [X_BPTC],
    'texture-compression-etc2': [X_ETC2],
    'texture-compression-astc': [X_ASTC],
    'texture-compression-etc1-webgl': [X_ETC1],
    'texture-compression-pvrtc-webgl': [X_PVRTC],
    'texture-compression-atc-webgl': [X_ATC]
};
/** Return a list of texture feature strings (for Device.features). Mainly compressed texture support */
// export function getTextureFeatures(
//   gl: WebGL2RenderingContext,
//   extensions: GLExtensions
// ): DeviceFeature[] {
//   const textureFeatures = Object.keys(TEXTURE_FEATURES) as DeviceFeature[];
//   return textureFeatures.filter(feature => checkTextureFeature(gl, feature, extensions));
// }
export function isTextureFeature(feature) {
    return feature in TEXTURE_FEATURES;
}
/** Checks a texture feature (for Device.features). Mainly compressed texture support */
export function checkTextureFeature(gl, feature, extensions) {
    const textureExtensions = TEXTURE_FEATURES[feature] || [];
    return textureExtensions.every(extension => getWebGLExtension(gl, extension, extensions));
}
// TABLES
/**
 * Texture format data -
 * Exported but can change without notice
 */
// prettier-ignore
export const TEXTURE_FORMATS = {
    // Unsized formats that leave the precision up to the driver. TODO - Fix bpp constants
    'rgb8unorm-unsized': { gl: 6407, b: 4, c: 2, bpp: 4,
        dataFormat: 6407, types: [5121, 33635] },
    'rgba8unorm-unsized': { gl: 6408, b: 4, c: 2, bpp: 4,
        dataFormat: 6408, types: [5121, 32819, 32820] },
    // 'r8unorm-unsized': {gl: GL.LUMINANCE, b: 4, c: 2, bpp: 4},
    // 'rgb8unorm-srgb-unsized': {gl: GL.SRGB_EXT, b: 4, c: 2, bpp: 4, gl1Ext: SRGB},
    // 'rgba8unorm-srgb-unsized': {gl: GL.SRGB_ALPHA_EXT, b: 4, c: 2, bpp: 4, gl1Ext: SRGB},
    // 8-bit formats
    'r8unorm': { gl: 33321, b: 1, c: 1, rb: true },
    'r8snorm': { gl: 36756, b: 1, c: 1, render: snorm8_renderable },
    'r8uint': { gl: 33330, b: 1, c: 1, rb: true },
    'r8sint': { gl: 33329, b: 1, c: 1, rb: true },
    // 16-bit formats
    'rg8unorm': { gl: 33323, b: 2, c: 2, rb: true },
    'rg8snorm': { gl: 36757, b: 2, c: 2, render: snorm8_renderable },
    'rg8uint': { gl: 33336, b: 2, c: 2, rb: true },
    'rg8sint': { gl: 33335, b: 2, c: 2, rb: true },
    'r16uint': { gl: 33332, b: 2, c: 1, rb: true },
    'r16sint': { gl: 33331, b: 2, c: 1, rb: true },
    'r16float': { gl: 33325, b: 2, c: 1, render: float16_renderable, filter: 'float16-filterable-webgl', rb: true },
    'r16unorm-webgl': { gl: 33322, b: 2, c: 1, f: norm16_renderable, rb: true },
    'r16snorm-webgl': { gl: 36760, b: 2, c: 1, f: snorm16_renderable },
    // Packed 16-bit formats
    'rgba4unorm-webgl': { gl: 32854, b: 2, c: 4, wgpu: false, rb: true },
    'rgb565unorm-webgl': { gl: 36194, b: 2, c: 4, wgpu: false, rb: true },
    'rgb5a1unorm-webgl': { gl: 32855, b: 2, c: 4, wgpu: false, rb: true },
    // 24-bit formats
    'rgb8unorm-webgl': { gl: 32849, b: 3, c: 3, wgpu: false },
    'rgb8snorm-webgl': { gl: 36758, b: 3, c: 3, wgpu: false },
    // 32-bit formats  
    'rgba8unorm': { gl: 32856, b: 4, c: 2, bpp: 4 },
    'rgba8unorm-srgb': { gl: 35907, b: 4, c: 4, bpp: 4 },
    'rgba8snorm': { gl: 36759, b: 4, c: 4, render: snorm8_renderable },
    'rgba8uint': { gl: 36220, b: 4, c: 4, bpp: 4 },
    'rgba8sint': { gl: 36238, b: 4, c: 4, bpp: 4 },
    // reverse colors, webgpu only
    'bgra8unorm': { b: 4, c: 4 },
    'bgra8unorm-srgb': { b: 4, c: 4 },
    'rg16uint': { gl: 33338, b: 4, c: 1, bpp: 4 },
    'rg16sint': { gl: 33337, b: 4, c: 2, bpp: 4 },
    // When using a WebGL 2 context and the EXT_color_buffer_float WebGL2 extension
    'rg16float': { gl: 33327, bpp: 4, b: 4, c: 2, render: float16_renderable, filter: float16_filterable, rb: true },
    'rg16unorm-webgl': { gl: 33324, b: 2, c: 2, render: norm16_renderable },
    'rg16snorm-webgl': { gl: 36761, b: 2, c: 2, render: snorm16_renderable },
    'r32uint': { gl: 33334, b: 4, c: 1, bpp: 4, rb: true },
    'r32sint': { gl: 33333, b: 4, c: 1, bpp: 4, rb: true },
    'r32float': { gl: 33326, bpp: 4, b: 4, c: 1, render: float32_renderable, filter: float32_filterable },
    // Packed 32-bit formats
    'rgb9e5ufloat': { gl: 35901, b: 4, c: 3, p: 1, render: rgb9e5ufloat_renderable }, // , filter: true},
    'rg11b10ufloat': { gl: 35898, b: 4, c: 3, p: 1, render: float32_renderable, rb: true },
    'rgb10a2unorm': { gl: 32857, b: 4, c: 4, p: 1, rb: true },
    'rgb10a2uint-webgl': { b: 4, c: 4, gl: 36975, p: 1, wgpu: false, bpp: 4, rb: true },
    // 48-bit formats
    'rgb16unorm-webgl': { gl: 32852, b: 2, c: 3, f: norm16_renderable }, // rgb not renderable
    'rgb16snorm-webgl': { gl: 36762, b: 2, c: 3, f: norm16_renderable }, // rgb not renderable
    // 64-bit formats
    'rg32uint': { gl: 33340, b: 8, c: 2, rb: true },
    'rg32sint': { gl: 33339, b: 8, c: 2, rb: true },
    'rg32float': { gl: 33328, b: 8, c: 2, render: float32_renderable, filter: float32_filterable, rb: true },
    'rgba16uint': { gl: 36214, b: 8, c: 4, rb: true },
    'rgba16sint': { gl: 36232, b: 8, c: 4, rb: true },
    'rgba16float': { gl: 34842, b: 8, c: 4, render: float16_renderable, filter: float16_filterable },
    'rgba16unorm-webgl': { gl: 32859, b: 2, c: 4, render: norm16_renderable, rb: true },
    'rgba16snorm-webgl': { gl: 36763, b: 2, c: 4, render: snorm16_renderable },
    // 96-bit formats (deprecated!)
    'rgb32float-webgl': { gl: 34837, render: float32_renderable, filter: float32_filterable,
        gl2ext: EXT_color_buffer_float, dataFormat: 6407, types: [5126] },
    // 128-bit formats
    'rgba32uint': { gl: 36208, b: 16, c: 4, rb: true },
    'rgba32sint': { gl: 36226, b: 16, c: 4, rb: true },
    'rgba32float': { gl: 34836, b: 16, c: 4, render: float32_renderable, filter: float32_filterable, rb: true },
    // Depth and stencil formats
    'stencil8': { gl: 36168, b: 1, c: 1, attachment: 36128, rb: true }, // 8 stencil bits
    'depth16unorm': { gl: 33189, b: 2, c: 1, attachment: 36096,
        dataFormat: 6402, types: [5123], rb: true }, // 16 depth bits
    'depth24plus': { gl: 33190, b: 3, c: 1, attachment: 36096,
        dataFormat: 6402, types: [5125] },
    'depth32float': { gl: 36012, b: 4, c: 1, attachment: 36096,
        dataFormat: 6402, types: [5126], rb: true },
    // The depth component of the "depth24plus" and "depth24plus-stencil8" formats may be implemented as either a 24-bit depth value or a "depth32float" value.
    'depth24plus-stencil8': { gl: 35056, b: 4, c: 2, p: 1, attachment: 33306, rb: true, depthTexture: true,
        dataFormat: 34041, types: [34042] },
    // "depth24unorm-stencil8" feature
    'depth24unorm-stencil8': { gl: 35056, b: 4, c: 2, p: 1, attachment: 33306,
        dataFormat: 34041, types: [34042], rb: true },
    // "depth32float-stencil8" feature - TODO below is render buffer only?
    'depth32float-stencil8': { gl: 36013, b: 5, c: 2, p: 1, attachment: 33306,
        dataFormat: 34041, types: [36269], rb: true },
    // BC compressed formats: check device.features.has("texture-compression-bc");
    'bc1-rgb-unorm-webgl': { gl: 33776, x: X_S3TC, f: texture_compression_bc },
    'bc1-rgb-unorm-srgb-webgl': { gl: 35916, x: X_S3TC_SRGB, f: texture_compression_bc },
    'bc1-rgba-unorm': { gl: 33777, x: X_S3TC, f: texture_compression_bc },
    'bc1-rgba-unorm-srgb': { gl: 35916, x: X_S3TC_SRGB, f: texture_compression_bc },
    'bc2-rgba-unorm': { gl: 33778, x: X_S3TC, f: texture_compression_bc },
    'bc2-rgba-unorm-srgb': { gl: 35918, x: X_S3TC_SRGB, f: texture_compression_bc },
    'bc3-rgba-unorm': { gl: 33779, x: X_S3TC, f: texture_compression_bc },
    'bc3-rgba-unorm-srgb': { gl: 35919, x: X_S3TC_SRGB, f: texture_compression_bc },
    'bc4-r-unorm': { gl: 36283, x: X_RGTC, f: texture_compression_bc },
    'bc4-r-snorm': { gl: 36284, x: X_RGTC, f: texture_compression_bc },
    'bc5-rg-unorm': { gl: 36285, x: X_RGTC, f: texture_compression_bc },
    'bc5-rg-snorm': { gl: 36286, x: X_RGTC, f: texture_compression_bc },
    'bc6h-rgb-ufloat': { gl: 36495, x: X_BPTC, f: texture_compression_bc },
    'bc6h-rgb-float': { gl: 36494, x: X_BPTC, f: texture_compression_bc },
    'bc7-rgba-unorm': { gl: 36492, x: X_BPTC, f: texture_compression_bc },
    'bc7-rgba-unorm-srgb': { gl: 36493, x: X_BPTC, f: texture_compression_bc },
    // WEBGL_compressed_texture_etc: device.features.has("texture-compression-etc2")
    // Note: Supposedly guaranteed availability compressed formats in WebGL2, but through CPU decompression
    'etc2-rgb8unorm': { gl: 37492, f: texture_compression_etc2 },
    'etc2-rgb8unorm-srgb': { gl: 37494, f: texture_compression_etc2 },
    'etc2-rgb8a1unorm': { gl: 37496, f: texture_compression_etc2 },
    'etc2-rgb8a1unorm-srgb': { gl: 37497, f: texture_compression_etc2 },
    'etc2-rgba8unorm': { gl: 37493, f: texture_compression_etc2 },
    'etc2-rgba8unorm-srgb': { gl: 37495, f: texture_compression_etc2 },
    'eac-r11unorm': { gl: 37488, f: texture_compression_etc2 },
    'eac-r11snorm': { gl: 37489, f: texture_compression_etc2 },
    'eac-rg11unorm': { gl: 37490, f: texture_compression_etc2 },
    'eac-rg11snorm': { gl: 37491, f: texture_compression_etc2 },
    // X_ASTC compressed formats: device.features.has("texture-compression-astc")
    'astc-4x4-unorm': { gl: 37808, f: texture_compression_astc },
    'astc-4x4-unorm-srgb': { gl: 37840, f: texture_compression_astc },
    'astc-5x4-unorm': { gl: 37809, f: texture_compression_astc },
    'astc-5x4-unorm-srgb': { gl: 37841, f: texture_compression_astc },
    'astc-5x5-unorm': { gl: 37810, f: texture_compression_astc },
    'astc-5x5-unorm-srgb': { gl: 37842, f: texture_compression_astc },
    'astc-6x5-unorm': { gl: 37811, f: texture_compression_astc },
    'astc-6x5-unorm-srgb': { gl: 37843, f: texture_compression_astc },
    'astc-6x6-unorm': { gl: 37812, f: texture_compression_astc },
    'astc-6x6-unorm-srgb': { gl: 37844, f: texture_compression_astc },
    'astc-8x5-unorm': { gl: 37813, f: texture_compression_astc },
    'astc-8x5-unorm-srgb': { gl: 37845, f: texture_compression_astc },
    'astc-8x6-unorm': { gl: 37814, f: texture_compression_astc },
    'astc-8x6-unorm-srgb': { gl: 37846, f: texture_compression_astc },
    'astc-8x8-unorm': { gl: 37815, f: texture_compression_astc },
    'astc-8x8-unorm-srgb': { gl: 37847, f: texture_compression_astc },
    'astc-10x5-unorm': { gl: 37819, f: texture_compression_astc },
    'astc-10x5-unorm-srgb': { gl: 37851, f: texture_compression_astc },
    'astc-10x6-unorm': { gl: 37817, f: texture_compression_astc },
    'astc-10x6-unorm-srgb': { gl: 37849, f: texture_compression_astc },
    'astc-10x8-unorm': { gl: 37818, f: texture_compression_astc },
    'astc-10x8-unorm-srgb': { gl: 37850, f: texture_compression_astc },
    'astc-10x10-unorm': { gl: 37819, f: texture_compression_astc },
    'astc-10x10-unorm-srgb': { gl: 37851, f: texture_compression_astc },
    'astc-12x10-unorm': { gl: 37820, f: texture_compression_astc },
    'astc-12x10-unorm-srgb': { gl: 37852, f: texture_compression_astc },
    'astc-12x12-unorm': { gl: 37821, f: texture_compression_astc },
    'astc-12x12-unorm-srgb': { gl: 37853, f: texture_compression_astc },
    // WEBGL_compressed_texture_pvrtc
    'pvrtc-rgb4unorm-webgl': { gl: 35840, f: texture_compression_pvrtc_webgl },
    'pvrtc-rgba4unorm-webgl': { gl: 35842, f: texture_compression_pvrtc_webgl },
    'pvrtc-rbg2unorm-webgl': { gl: 35841, f: texture_compression_pvrtc_webgl },
    'pvrtc-rgba2unorm-webgl': { gl: 35843, f: texture_compression_pvrtc_webgl },
    // WEBGL_compressed_texture_etc1
    'etc1-rbg-unorm-webgl': { gl: 36196, f: texture_compression_etc1_webgl },
    // WEBGL_compressed_texture_atc
    'atc-rgb-unorm-webgl': { gl: 35986, f: texture_compression_atc_webgl },
    'atc-rgba-unorm-webgl': { gl: 35986, f: texture_compression_atc_webgl },
    'atc-rgbai-unorm-webgl': { gl: 34798, f: texture_compression_atc_webgl }
};
/** Legal combinations for internalFormat, format and type *
// [GL.DEPTH_COMPONENT]: {types: [GL.UNSIGNED_SHORT, GL.UNSIGNED_INT, GL.UNSIGNED_INT_24_8]},
// [GL.DEPTH_STENCIL]: ,
// Sized texture format
// R
[GL.R8]: {dataFormat: GL.RED, types: [GL.UNSIGNED_BYTE], gl2: true},
[GL.R16F]: {dataFormat: GL.RED, types: [GL.HALF_FLOAT, GL.FLOAT], gl2: true},
[GL.R8UI]: {dataFormat: GL.RED_INTEGER, types: [GL.UNSIGNED_BYTE], gl2: true},
// // RG
[GL.RG8]: {dataFormat: GL.RG, types: [GL.UNSIGNED_BYTE], gl2: true},
[GL.RG16F]: {dataFormat: GL.RG, types: [GL.HALF_FLOAT, GL.FLOAT], gl2: true},
[GL.RG8UI]: {dataFormat: GL.RG_INTEGER, types: [GL.UNSIGNED_BYTE], gl2: true},
// // RGB
[GL.RGB8]: {dataFormat: GL.RGB, types: [GL.UNSIGNED_BYTE], gl2: true},
[GL.SRGB8]: {dataFormat: GL.RGB, types: [GL.UNSIGNED_BYTE], gl2: true},
[GL.RGB16F]: {dataFormat: GL.RGB, types: [GL.HALF_FLOAT, GL.FLOAT], gl2: true},
[GL.RGB8UI]: {dataFormat: GL.RGB_INTEGER, types: [GL.UNSIGNED_BYTE], gl2: true},
// // RGBA

[GL.RGB565]: {dataFormat: GL.RGB, types: [GL.UNSIGNED_BYTE, GL.UNSIGNED_SHORT_5_6_5], gl2: true},
[GL.R11F_G11F_B10F]: {dataFormat: GL.RGB, types: [GL.UNSIGNED_INT_10F_11F_11F_REV, GL.HALF_FLOAT, GL.FLOAT], gl2: true},
[GL.RGB9_E5]: {dataFormat: GL.RGB, types: [GL.HALF_FLOAT, GL.FLOAT], gl2: true},
[GL.RGBA8]: {dataFormat: GL.RGBA, types: [GL.UNSIGNED_BYTE], gl2: true},
[GL.SRGB8_ALPHA8]: {dataFormat: GL.RGBA, types: [GL.UNSIGNED_BYTE], gl2: true, gl1ext: EXT_SRGB},
[GL.RGB5_A1]: {dataFormat: GL.RGBA, types: [GL.UNSIGNED_BYTE, GL.UNSIGNED_SHORT_5_5_5_1], gl2: true},
[GL.RGBA4]: {dataFormat: GL.RGBA, types: [GL.UNSIGNED_BYTE, GL.UNSIGNED_SHORT_4_4_4_4], gl2: true},
[GL.RGBA16F]: {dataFormat: GL.RGBA, types: [GL.HALF_FLOAT, GL.FLOAT], gl2: true},
[GL.RGBA8UI]: {dataFormat: GL.RGBA_INTEGER, types: [GL.UNSIGNED_BYTE], gl2: true}
*/
/* This table is now baked into the above table
type RenderbufferFormat = {
  bpp: number;
  gl2?: boolean;
  ext?: string;
};

export const RENDERBUFFER_FORMATS: Record<string, RenderbufferFormat> = {
  [GL.DEPTH_COMPONENT16]: {bpp: 2}, // 16 depth bits.
  // TODO - Not clear which webgpu value to map this to.
  // [GL.DEPTH_COMPONENT24]: {gl2: true, bpp: 3},
  [GL.DEPTH_COMPONENT32F]: {gl2: true, bpp: 4},

  [GL.STENCIL_INDEX8]: {bpp: 1}, // 8 stencil bits.

  [GL.DEPTH_STENCIL]: {bpp: 4},
  [GL.DEPTH24_STENCIL8]: {gl2: true, bpp: 4},
  [GL.DEPTH32F_STENCIL8]: {gl2: true, bpp: 5},

  // When using a WebGL 1 context, color renderbuffer formats are limited
  [GL.RGBA4]: {gl2: true, bpp: 2},
  [GL.RGB565]: {gl2: true, bpp: 2},
  [GL.RGB5_A1]: {gl2: true, bpp: 2},

  // When using a WebGL 2 context, the following values are available additionally:
  [GL.R8]: {gl2: true, bpp: 1},
  [GL.R8UI]: {gl2: true, bpp: 1},
  [GL.R8I]: {gl2: true, bpp: 1},
  [GL.R16UI]: {gl2: true, bpp: 2},
  [GL.R16I]: {gl2: true, bpp: 2},
  [GL.R32UI]: {gl2: true, bpp: 4},
  [GL.R32I]: {gl2: true, bpp: 4},
  [GL.RG8]: {gl2: true, bpp: 2},
  [GL.RG8UI]: {gl2: true, bpp: 2},
  [GL.RG8I]: {gl2: true, bpp: 2},
  [GL.RG16UI]: {gl2: true, bpp: 4},
  [GL.RG16I]: {gl2: true, bpp: 4},
  [GL.RG32UI]: {gl2: true, bpp: 8},
  [GL.RG32I]: {gl2: true, bpp: 8},
  [GL.RGB8]: {gl2: true, bpp: 3},
  [GL.RGBA8]: {gl2: true, bpp: 4},
  // [GL.SRGB8_ALPHA8]: {gl2: true, gl1: SRGB}, // When using the EXT_sRGB WebGL1 extension
  [GL.RGB10_A2]: {gl2: true, bpp: 4},
  [GL.RGBA8UI]: {gl2: true, bpp: 4},
  [GL.RGBA8I]: {gl2: true, bpp: 4},
  [GL.RGB10_A2UI]: {gl2: true, bpp: 4},
  [GL.RGBA16UI]: {gl2: true, bpp: 8},
  [GL.RGBA16I]: {gl2: true, bpp: 8},
  [GL.RGBA32I]: {gl2: true, bpp: 16},
  [GL.RGBA32UI]: {gl2: true, bpp: 16},

  // When using a WebGL 2 context and the EXT_color_buffer_float WebGL2 extension
  [GL.R16F]: {ext: EXT_FLOAT_WEBGL2, bpp: 2},
  [GL.RG16F]: {ext: EXT_FLOAT_WEBGL2, bpp: 4},
  [GL.RGBA16F]: {ext: EXT_FLOAT_WEBGL2, bpp: 8},
  [GL.R32F]: {ext: EXT_FLOAT_WEBGL2, bpp: 4},
  [GL.RG32F]: {ext: EXT_FLOAT_WEBGL2, bpp: 8},
  // TODO - can't get WEBGL_color_buffer_float to work on renderbuffers
  [GL.RGBA32F]: {ext: EXT_FLOAT_WEBGL2, bpp: 16},
  // [GL.RGBA32F]: {ext: EXT_FLOAT_WEBGL2},
  [GL.R11F_G11F_B10F]: {ext: EXT_FLOAT_WEBGL2, bpp: 4}
};
*/
/** @deprecated should be removed */
const DATA_FORMAT_CHANNELS = {
    [6403]: 1,
    [36244]: 1,
    [33319]: 2,
    [33320]: 2,
    [6407]: 3,
    [36248]: 3,
    [6408]: 4,
    [36249]: 4,
    [6402]: 1,
    [34041]: 1,
    [6406]: 1,
    [6409]: 1,
    [6410]: 2
};
/** @deprecated should be removed */
const TYPE_SIZES = {
    [5126]: 4,
    [5125]: 4,
    [5124]: 4,
    [5123]: 2,
    [5122]: 2,
    [5131]: 2,
    [5120]: 1,
    [5121]: 1
};
// FUNCTIONS
/** Checks if a texture format is supported */
export function isTextureFormatSupported(gl, format, extensions) {
    const info = TEXTURE_FORMATS[format];
    if (!info) {
        return false;
    }
    // Check that we have a GL constant
    if (info.gl === undefined) {
        return false;
    }
    // Check extensions
    const extension = info.x || info.gl2ext;
    if (extension) {
        return Boolean(getWebGLExtension(gl, extension, extensions));
    }
    return true;
}
export function isRenderbufferFormatSupported(gl, format, extensions) {
    // Note: Order is important since the function call initializes extensions.
    return isTextureFormatSupported(gl, format, extensions) && TEXTURE_FORMATS[format]?.rb;
}
/**
 * Map WebGL texture formats (GL constants) to WebGPU-style TextureFormat strings
 */
export function convertGLToTextureFormat(format) {
    if (typeof format === 'string') {
        return format;
    }
    const entry = Object.entries(TEXTURE_FORMATS).find(([, entry]) => entry.gl === format);
    if (!entry) {
        throw new Error(`Unknown texture format ${format}`);
    }
    return entry[0];
}
/**
 * Map WebGPU style texture format strings to GL constants
 */
export function convertTextureFormatToGL(format) {
    const formatInfo = TEXTURE_FORMATS[format];
    const webglFormat = formatInfo?.gl;
    if (webglFormat === undefined) {
        throw new Error(`Unsupported texture format ${format}`);
    }
    return webglFormat;
}
/** Checks if a texture format is supported */
export function getTextureFormatSupport(gl, format, extensions) {
    const info = TEXTURE_FORMATS[format];
    if (!info) {
        return { supported: false };
    }
    // let decoded;
    // try {
    //   decoded = decodeTextureFormat(format);
    // } catch {}
    // Support Check that we have a GL constant
    let supported = info.gl === undefined;
    supported = supported && checkTextureFeature(gl, info.f, extensions);
    // Filtering
    // const filterable = info.filter
    //   ? checkTextureFeature(gl, infofilter])
    //   : decoded && !decoded.signed;
    // const renderable = info.filter
    //   ? checkTextureFeature(gl, inforender])
    //   : decoded && !decoded.signed;
    return {
        supported,
        renderable: supported && checkTextureFeature(gl, info.render, extensions),
        filterable: supported && checkTextureFeature(gl, info.filter, extensions),
        blendable: false, // tod,
        storable: false
    };
}
/** Checks whether linear filtering (interpolated sampling) is available for floating point textures */
export function isTextureFormatFilterable(gl, format, extensions) {
    if (!isTextureFormatSupported(gl, format, extensions)) {
        return false;
    }
    if (format.startsWith('depth') || format.startsWith('stencil')) {
        return false;
    }
    try {
        const decoded = decodeTextureFormat(format);
        if (decoded.signed) {
            return false;
        }
    }
    catch {
        return false;
    }
    if (format.endsWith('32float')) {
        return Boolean(getWebGLExtension(gl, 'OES_texture_float_linear, extensions', extensions));
    }
    if (format.endsWith('16float')) {
        return Boolean(getWebGLExtension(gl, 'OES_texture_half_float_linear, extensions', extensions));
    }
    return true;
}
export function isTextureFormatRenderable(gl, format, extensions) {
    if (!isTextureFormatSupported(gl, format, extensions)) {
        return false;
    }
    if (typeof format === 'number') {
        return false; // isTextureFormatFilterableWebGL(gl, format);
    }
    // TODO depends on device...
    return true;
}
/** Get parameters necessary to work with format in WebGL: internalFormat, dataFormat, type, compressed, */
export function getWebGLTextureParameters(format) {
    const formatData = TEXTURE_FORMATS[format];
    const webglFormat = convertTextureFormatToGL(format);
    const decoded = decodeTextureFormat(format);
    return {
        format: webglFormat,
        dataFormat: formatData?.dataFormat ||
            getWebGLPixelDataFormat(decoded.format, decoded.integer, decoded.normalized, webglFormat),
        // depth formats don't have a type
        type: decoded.dataType
            ? getGLFromVertexType(decoded.dataType)
            : formatData?.types?.[0] || 5121,
        // @ts-expect-error
        compressed: decoded.compressed
    };
}
export function getDepthStencilAttachmentWebGL(format) {
    const info = TEXTURE_FORMATS[format];
    if (!info?.attachment) {
        throw new Error(`${format} is not a depth stencil format`);
    }
    return info.attachment;
}
/** TODO - VERY roundabout legacy way of calculating bytes per pixel */
export function getTextureFormatBytesPerPixel(format) {
    // TODO remove webgl1 support
    const params = getWebGLTextureParameters(format);
    // NOTE(Tarek): Default to RGBA bytes
    const channels = DATA_FORMAT_CHANNELS[params.dataFormat] || 4;
    const channelSize = TYPE_SIZES[params.type] || 1;
    return channels * channelSize;
}
// DATA TYPE HELPERS
function getWebGLPixelDataFormat(dataFormat, integer, normalized, format) {
    // WebGL1 formats use same internalFormat
    if (format === 6408 || format === 6407) {
        return format;
    }
    // prettier-ignore
    switch (dataFormat) {
        case 'r': return integer && !normalized ? 36244 : 6403;
        case 'rg': return integer && !normalized ? 33320 : 33319;
        case 'rgb': return integer && !normalized ? 36248 : 6407;
        case 'rgba': return integer && !normalized ? 36249 : 6408;
        default: return 6408;
    }
}