Unity3d Texture Type Descriptions.

PrintUnity3dType.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestUnityConsole
{
    class Program
    {
        public enum TextureFormat
        {
            Alpha8 = 1,
            ARGB4444,
            RGB24,
            RGBA32,
            ARGB32,
            RGB565 = 7,
            R16 = 9,
            DXT1,
            DXT5 = 12,
            RGBA4444,
            BGRA32,
            RHalf,
            RGHalf,
            RGBAHalf,
            RFloat,
            RGFloat,
            RGBAFloat,
            YUY2,
            DXT1Crunched = 28,
            DXT5Crunched,
            PVRTC_RGB2,
            PVRTC_RGBA2,
            PVRTC_RGB4,
            PVRTC_RGBA4,
            ETC_RGB4,
            ATC_RGB4,
            ATC_RGBA8,
            EAC_R = 41,
            EAC_R_SIGNED,
            EAC_RG,
            EAC_RG_SIGNED,
            ETC2_RGB,
            ETC2_RGBA1,
            ETC2_RGBA8,
            ASTC_RGB_4x4,
            ASTC_RGB_5x5,
            ASTC_RGB_6x6,
            ASTC_RGB_8x8,
            ASTC_RGB_10x10,
            ASTC_RGB_12x12,
            ASTC_RGBA_4x4,
            ASTC_RGBA_5x5,
            ASTC_RGBA_6x6,
            ASTC_RGBA_8x8,
            ASTC_RGBA_10x10,
            ASTC_RGBA_12x12,
            PVRTC_2BPP_RGB = -127,
            PVRTC_2BPP_RGBA = -127,
            PVRTC_4BPP_RGB = -127,
            PVRTC_4BPP_RGBA = -127
        }

        static void Main(string[] args)
        {
            foreach (string name in Enum.GetNames(typeof(TextureFormat)))
            {
                int cur_value = (int)Enum.Parse(typeof(TextureFormat), name);
                if (cur_value < 0)
                    continue;
                Console.WriteLine("{0,18} {1, 5}   0x{2, 4:X4}", name, cur_value, cur_value);
            }

            Console.ReadKey();
        }
    }
}

TypeChart.md

Type	value	hex value
Alpha8	1	0x0001	Alpha-only texture format.
ARGB4444	2	0x0002	A 16 bits/pixel texture format. Texture stores color with an alpha channel.
RGB24	3	0x0003	A color texture format.
RGBA32	4	0x0004	Color with alpha texture format, 8-bits per channel.
ARGB32	5	0x0005	Color with an alpha channel texture format.
RGB565	7	0x0007	A 16 bit color texture format.
R16	9	0x0009	A 16 bit color texture format that only has a red channel.
DXT1	10	0x000A	Compressed color texture format.
DXT5	12	0x000C	Compressed color with alpha channel texture format.
RGBA4444	13	0x000D	Color and alpha texture format, 4 bit per channel.
BGRA32	14	0x000E	Format returned by iPhone camera.
RHalf	15	0x000F	Scalar (R) texture format, 16 bit floating point.
RGHalf	16	0x0010	Two color (RG) texture format, 16 bit floating point per channel.
RGBAHalf	17	0x0011	RGB color and alpha texture format, 16 bit floating point per channel.
RFloat	18	0x0012	Scalar (R) texture format, 32 bit floating point.
RGFloat	19	0x0013	Two color (RG) texture format, 32 bit floating point per channel.
RGBAFloat	20	0x0014	RGB color and alpha etxture format, 32-bit floats per channel.
YUY2	21	0x0015	A format that uses the YUV color space and is often used for video encoding. Currently, this texture format is only useful for native code plugins as there is no support for texture importing or pixel access for this format. YUY2 is implemented for Direct3D 9, Direct3D 11, and Xbox One.
DXT1Crunched	28	0x001C	Compressed color texture format with crunch compression for small storage sizes.
DXT5Crunched	29	0x001D	Compressed color with alpha channel texture format with crunch compression for small storage sizes.
PVRTC_RGB2	30	0x001E	PowerVR (iOS) 2 bits/pixel compressed color texture format.
PVRTC_RGBA2	31	0x001F	PowerVR (iOS) 2 bits/pixel compressed with alpha channel texture format.
PVRTC_RGB4	32	0x0020	PowerVR (iOS) 4 bits/pixel compressed color texture format.
PVRTC_RGBA4	33	0x0021	PowerVR (iOS) 4 bits/pixel compressed with alpha channel texture format.
ETC_RGB4	34	0x0022	ETC (GLES2.0) 4 bits/pixel compressed RGB texture format.
ATC_RGB4	35	0x0023	ATC (ATITC) 4 bits/pixel compressed RGB texture format.
ATC_RGBA8	36	0x0024	ATC (ATITC) 8 bits/pixel compressed RGB texture format.
EAC_R	41	0x0029	ETC2 / EAC (GL ES 3.0) 4 bits/pixel compressed unsigned single-channel texture format.
EAC_R_SIGNED	42	0x002A	ETC2 / EAC (GL ES 3.0) 4 bits/pixel compressed signed single-channel texture format.
EAC_RG	43	0x002B	ETC2 / EAC (GL ES 3.0) 8 bits/pixel compressed unsigned dual-channel (RG) texture format.
EAC_RG_SIGNED	44	0x002C	ETC2 / EAC (GL ES 3.0) 8 bits/pixel compressed signed dual-channel (RG) texture format.
ETC2_RGB	45	0x002D	ETC2 (GL ES 3.0) 4 bits/pixel compressed RGB texture format.
ETC2_RGBA1	46	0x002E	ETC2 (GL ES 3.0) 4 bits/pixel RGB+1-bit alpha texture format.
ETC2_RGBA8	47	0x002F	ETC2 (GL ES 3.0) 8 bits/pixel compressed RGBA texture format.
ASTC_RGB_4x4	48	0x0030	ASTC (4x4 pixel block in 128 bits) compressed RGB texture format.
ASTC_RGB_5x5	49	0x0031	ASTC (5x5 pixel block in 128 bits) compressed RGB texture format.
ASTC_RGB_6x6	50	0x0032	ASTC (6x6 pixel block in 128 bits) compressed RGB texture format.
ASTC_RGB_8x8	51	0x0033	ASTC (8x8 pixel block in 128 bits) compressed RGB texture format.
ASTC_RGB_10x10	52	0x0034	ASTC (10x10 pixel block in 128 bits) compressed RGB texture format.
ASTC_RGB_12x12	53	0x0035	ASTC (12x12 pixel block in 128 bits) compressed RGB texture format.
ASTC_RGBA_4x4	54	0x0036	ASTC (4x4 pixel block in 128 bits) compressed RGBA texture format.
ASTC_RGBA_5x5	55	0x0037	ASTC (5x5 pixel block in 128 bits) compressed RGBA texture format.
ASTC_RGBA_6x6	56	0x0038	ASTC (6x6 pixel block in 128 bits) compressed RGBA texture format.
ASTC_RGBA_8x8	57	0x0039	ASTC (8x8 pixel block in 128 bits) compressed RGBA texture format.
ASTC_RGBA_10x10	58	0x003A	ASTC (10x10 pixel block in 128 bits) compressed RGBA texture format.
ASTC_RGBA_12x12	59	0x003B	ASTC (12x12 pixel block in 128 bits) compressed RGBA texture format.