protected void LoadTexture(string filename)
{
if(String.IsNullOrEmpty(filename)){
throw new ArgumentException(filename);
}
if(texture_info.ContainsKey(filename)){
Texture t = texture_info[filename];
TextureIndex = t.TextureIndex;
TextureHeightPx = t.TextureHeightPx;
TextureWidthPx = t.TextureWidthPx;
}
else{
if(max_textures == -1){
GL.GetInteger(GetPName.MaxTextureImageUnits,out max_textures);
}
int num = next_texture++;
if(num == max_textures){ //todo: eventually fix this
throw new NotSupportedException("This machine only supports " + num + " texture units, and this GL code isn't smart enough to switch them out yet, sorry.");
}
GL.ActiveTexture(TextureUnit.Texture0 + num);
int id = GL.GenTexture(); //todo: eventually i'll want to support more than 16 or 32 textures. At that time I'll need to store this ID somewhere.
GL.BindTexture(TextureTarget.Texture2D,id); //maybe a list of Scenes which are lists of textures needed, and then i'll bind all those and make sure to track their texture units.
Bitmap bmp = new Bitmap(filename);
BitmapData bmp_data = bmp.LockBits(new Rectangle(0,0,bmp.Width,bmp.Height),ImageLockMode.ReadOnly,System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexImage2D(TextureTarget.Texture2D,0,PixelInternalFormat.Rgba,bmp_data.Width,bmp_data.Height,0,OpenTK.Graphics.OpenGL.PixelFormat.Bgra,PixelType.UnsignedByte,bmp_data.Scan0);
bmp.UnlockBits(bmp_data);
GL.TexParameter(TextureTarget.Texture2D,TextureParameterName.TextureMinFilter,(int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D,TextureParameterName.TextureMagFilter,(int)TextureMagFilter.Nearest);
TextureIndex = num;
TextureHeightPx = bmp.Height;
TextureWidthPx = bmp.Width;
Texture t = new Texture(); //this one goes into the dictionary as an easy way to store the index/height/width of this filename.
t.TextureIndex = num;
t.TextureHeightPx = bmp.Height;
t.TextureWidthPx = bmp.Width;
texture_info.Add(filename,t);
}
}
public static Texture Create(string filename)
{
Texture t = new Texture();
t.Sprite = new List<SpriteType>();
t.LoadTexture(filename);
return t;
}