private static void DoCreateSpriteTexture(Bitmap SpriteTextureBitmap, SpriteTexture SpriteTexture, Color Transparent, bool DisposePrevious)
{
int Width = SpriteTextureBitmap.Width;
int Height = SpriteTextureBitmap.Height;
if (DisposePrevious)
GL.DeleteTexture(SpriteTexture.Handle);
SpriteTexture.Handle = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, SpriteTexture.Handle);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge); // Sprite textures should not wrap.
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge); // Sprite textures should not wrap.
// Correct anti-aliased image to better work with the OpenGL blending process, that only uses the alpha-channel to blend.
BitmapData data = SpriteTextureBitmap.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
if (Transparent != Color.Empty)
{
int j;
byte R, G, B, A;
R = Transparent.R;
G = Transparent.G;
B = Transparent.B;
A = Transparent.A;
int BmpSize = data.Stride * Height;
byte[] Rgb = new byte[BmpSize];
Marshal.Copy(data.Scan0, Rgb, 0, BmpSize);
for (j = 0; j < BmpSize; j += 4)
{
if (Rgb[j] == B && Rgb[j + 1] == G && Rgb[j + 2] == R && Rgb[j + 3] == A)
{
Rgb[j] = 0;
Rgb[j + 1] = 0;
Rgb[j + 2] = 0;
Rgb[j + 3] = 0;
}
}
Marshal.Copy(Rgb, 0, data.Scan0, BmpSize);
}
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, Width, Height, 0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra,
PixelType.UnsignedByte, data.Scan0);
SpriteTextureBitmap.UnlockBits(data);
SpriteTextureBitmap.Dispose();
}
/// <summary>
/// Defines a new sprite texture.
/// </summary>
/// <param name="SpriteTextureBitmap">Sprite texture.</param>
/// <param name="Offset">Offset to sprite anchor point.</param>
/// <param name="Transparent">Color to be interpreted as transparent, in case transparency is not encoded using the alpha-channel.</param>
/// <param name="DisposeBitmap">If bitmap is to be disposed after the sprite texture has been created.</param>
/// <returns>Sprite texture index. Use this index when defining what texture to display for a sprite.</returns>
public static int AddSpriteTexture(Bitmap SpriteTextureBitmap, Point Offset, Color Transparent, bool DisposeBitmap)
{
Bitmap Bmp = DisposeBitmap ? SpriteTextureBitmap : (Bitmap)SpriteTextureBitmap.Clone();
SpriteTexture SpriteTexture = new SpriteTexture(-1, new Size(SpriteTextureBitmap.Width, SpriteTextureBitmap.Height), Offset);
int Result;
lock (spriteTexturesDynamic)
{
Result = spriteTexturesDynamic.Count;
spriteTexturesDynamic.Add(SpriteTexture);
spriteTexturesStatic = spriteTexturesDynamic.ToArray();
}
lock (openGLTasks)
{
openGLTasks.AddLast((sender, e) => DoCreateSpriteTexture(Bmp, SpriteTexture, Transparent, false));
}
return Result;
}