import { panic } from "../utils/util";

export enum TextureFormat
{
    RGB = WebGL2RenderingContext.RGB,
    RGBA = WebGL2RenderingContext.RGBA,
    LUMINANCE_ALPHA = WebGL2RenderingContext.LUMINANCE_ALPHA,
    LUMINANCE = WebGL2RenderingContext.LUMINANCE,
    ALPHA = WebGL2RenderingContext.ALPHA,
    R8 = WebGL2RenderingContext.R8,
    R16F = WebGL2RenderingContext.R16F,
    R32F = WebGL2RenderingContext.R32F,
    R8UI = WebGL2RenderingContext.R8UI,
    RG8 = WebGL2RenderingContext.RG8,
    RG16F = WebGL2RenderingContext.RG16F,
    RG32F = WebGL2RenderingContext.RG32F,
    RG8UI = WebGL2RenderingContext.RG8UI,
    RGB8 = WebGL2RenderingContext.RGB8,
    SRGB8 = WebGL2RenderingContext.SRGB8,
    RGB565 = WebGL2RenderingContext.RGB565,
    R11F_G11F_B10F = WebGL2RenderingContext.R11F_G11F_B10F,
    RGB9_E5 = WebGL2RenderingContext.RGB9_E5,
    RGB16F = WebGL2RenderingContext.RGB16F,
    RGB32F = WebGL2RenderingContext.RGB32F,
    RGB8UI = WebGL2RenderingContext.RGB8UI,
    RGBA8 = WebGL2RenderingContext.RGBA8,
    SRGB8_ALPHA8 = WebGL2RenderingContext.SRGB8_ALPHA8,
    RGB5_A1 = WebGL2RenderingContext.RGB5_A1,
    RGB10_A2 = WebGL2RenderingContext.RGB10_A2,
    RGBA4 = WebGL2RenderingContext.RGBA4,
    RGBA16F = WebGL2RenderingContext.RGBA16F,
    RGBA32F = WebGL2RenderingContext.RGBA32F,
    RGBA8UI = WebGL2RenderingContext.RGBA8UI,
    DEPTH_COMPONENT = WebGL2RenderingContext.DEPTH_COMPONENT,
    DEPTH_STENCIL = WebGL2RenderingContext.DEPTH_STENCIL,
    DEPTH24_STENCIL8 = WebGL2RenderingContext.DEPTH24_STENCIL8,
    DEPTH32F_STENCIL8 = WebGL2RenderingContext.DEPTH32F_STENCIL8,
    DEPTH_COMPONENT24 = WebGL2RenderingContext.DEPTH_COMPONENT24,
    DEPTH_COMPONENT32F = WebGL2RenderingContext.DEPTH_COMPONENT32F,
};

// Reference: https://www.khronos.org/registry/webgl/specs/latest/2.0/#TEXTURE_TYPES_FORMATS_FROM_DOM_ELEMENTS_TABLE
export function mapGLFormat(gl: WebGL2RenderingContext, format: TextureFormat): [GLenum, GLenum, GLenum]
{
    const map: { [key in TextureFormat]: [GLenum, GLenum, GLenum] } = {
        [TextureFormat.RGB]: [gl.RGB, gl.RGB, gl.UNSIGNED_BYTE],
        [TextureFormat.RGBA]: [gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE],
        [TextureFormat.LUMINANCE_ALPHA]: [gl.LUMINANCE_ALPHA, gl.LUMINANCE_ALPHA, gl.UNSIGNED_BYTE],
        [TextureFormat.LUMINANCE]: [gl.LUMINANCE, gl.LUMINANCE, gl.UNSIGNED_BYTE],
        [TextureFormat.ALPHA]: [gl.ALPHA, gl.ALPHA, gl.UNSIGNED_BYTE],
        [TextureFormat.R8]: [gl.R8, gl.RED, gl.UNSIGNED_BYTE],
        [TextureFormat.R16F]: [gl.R16F, gl.RED, gl.HALF_FLOAT],
        [TextureFormat.R32F]: [gl.R32F, gl.RED, gl.FLOAT],
        [TextureFormat.R8UI]: [gl.R8UI, gl.RED_INTEGER, gl.UNSIGNED_BYTE],
        [TextureFormat.RG8]: [gl.RG8, gl.RG, gl.UNSIGNED_BYTE],
        [TextureFormat.RG16F]: [gl.RG16F, gl.RG, gl.HALF_FLOAT],
        [TextureFormat.RG32F]: [gl.RG32F, gl.RG, gl.FLOAT],
        [TextureFormat.RG8UI]: [gl.RG8UI, gl.RG_INTEGER, gl.UNSIGNED_BYTE],
        [TextureFormat.RGB8]: [gl.RGB8, gl.RGB, gl.UNSIGNED_BYTE],
        [TextureFormat.SRGB8]: [gl.SRGB8, gl.RGB, gl.UNSIGNED_BYTE],
        [TextureFormat.RGB565]: [gl.RGB565, gl.RGB, gl.UNSIGNED_BYTE],
        [TextureFormat.R11F_G11F_B10F]: [gl.R11F_G11F_B10F, gl.RGB, gl.UNSIGNED_INT_10F_11F_11F_REV],
        [TextureFormat.RGB9_E5]: [gl.RGB9_E5, gl.RGB, gl.HALF_FLOAT],
        [TextureFormat.RGB16F]: [gl.RGB16F, gl.RGB, gl.HALF_FLOAT],
        [TextureFormat.RGB32F]: [gl.RGB32F, gl.RGB, gl.FLOAT],
        [TextureFormat.RGB8UI]: [gl.RGB8UI, gl.RGB_INTEGER, gl.UNSIGNED_BYTE],
        [TextureFormat.RGBA8]: [gl.RGBA8, gl.RGBA, gl.UNSIGNED_BYTE],
        [TextureFormat.SRGB8_ALPHA8]: [gl.SRGB8_ALPHA8, gl.RGBA, gl.UNSIGNED_BYTE],
        [TextureFormat.RGB5_A1]: [gl.RGB5_A1, gl.RGBA, gl.UNSIGNED_BYTE],
        [TextureFormat.RGB10_A2]: [gl.RGB10_A2, gl.RGBA, gl.UNSIGNED_INT_2_10_10_10_REV],
        [TextureFormat.RGBA4]: [gl.RGBA4, gl.RGBA, gl.UNSIGNED_BYTE],
        [TextureFormat.RGBA16F]: [gl.RGBA16F, gl.RGBA, gl.HALF_FLOAT],
        [TextureFormat.RGBA32F]: [gl.RGBA32F, gl.RGBA, gl.FLOAT],
        [TextureFormat.RGBA8UI]: [gl.RGBA8UI, gl.RGBA_INTEGER, gl.UNSIGNED_BYTE],
        [TextureFormat.DEPTH_COMPONENT]: [gl.DEPTH_COMPONENT, gl.DEPTH_COMPONENT, gl.UNSIGNED_INT],
        [TextureFormat.DEPTH_STENCIL]: [gl.DEPTH_STENCIL, gl.DEPTH_COMPONENT, gl.UNSIGNED_INT],
        [TextureFormat.DEPTH_COMPONENT24]: [gl.DEPTH_COMPONENT24, gl.DEPTH_COMPONENT, gl.UNSIGNED_INT],
        [TextureFormat.DEPTH_COMPONENT32F]: [gl.DEPTH_COMPONENT32F, gl.DEPTH_COMPONENT, gl.FLOAT],
    };
    return map[format];
}