Texture.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tao.OpenGl;
using System.IO;
using System.Runtime.InteropServices;

namespace Graphics
{
    class Texture
    {
        uint mtexture;
        public int width, height;
        int TexUnit;
        public Texture(string path, int texUnit,bool flip=false)
        {
            try
            {
                Bitmap bitmap = (Bitmap)Bitmap.FromFile(path);
                if (flip)
                {
                    bitmap.RotateFlip(RotateFlipType.Rotate180FlipX);
                    //bitmap.RotateFlip(RotateFlipType.Rotate180FlipY);

                }
                Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
                BitmapData bitmapData = bitmap.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
                width = bitmap.Width;
                height = bitmap.Height;

                TexUnit = texUnit;
                Gl.glActiveTexture(texUnit);
                uint[] tex = { 0 };
                Gl.glGenTextures(1, tex);
                mtexture = tex[0];
                Gl.glBindTexture(Gl.GL_TEXTURE_2D, mtexture);

                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_WRAP_S, Gl.GL_REPEAT);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_WRAP_T, Gl.GL_REPEAT);


                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);

                Gl.glPixelStorei(Gl.GL_UNPACK_ALIGNMENT, 1);
                Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGBA, width, height, 0, Gl.GL_BGRA, Gl.GL_UNSIGNED_BYTE, bitmapData.Scan0);



                if (bitmap != null)
                {
                    bitmap.UnlockBits(bitmapData);
                    bitmap.Dispose();
                }
            }
            catch
            {
                width = 0;
                height = 0;
            }
        }
        public void UpdateTex(Bitmap bitmap)
        {
            try
            {
                Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
                BitmapData bitmapData = bitmap.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
                width = bitmap.Width;
                height = bitmap.Height;
                Gl.glActiveTexture(TexUnit);
                Gl.glBindTexture(Gl.GL_TEXTURE_2D, mtexture);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_WRAP_S, Gl.GL_REPEAT);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_WRAP_T, Gl.GL_REPEAT);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);
                Gl.glPixelStorei(Gl.GL_UNPACK_ALIGNMENT, 1);
                Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGBA, width, height, 0, Gl.GL_BGRA, Gl.GL_UNSIGNED_BYTE, bitmapData.Scan0);

                if (bitmap != null)
                {
                    bitmap.UnlockBits(bitmapData);
                    //bitmap.Dispose();
                }
            }
            catch
            {
                width = 0;
                height = 0;
            }
        }
        public void CleanUp()
        {
            Gl.glDeleteTextures(1, (IntPtr)mtexture);
        }
        public void Bind()
        {
            Gl.glActiveTexture(TexUnit);
            Gl.glBindTexture(Gl.GL_TEXTURE_2D, mtexture);
        }
    }
}