private int CreateTexture(Bitmap texture, TextureUnit unit, TextureMinFilter minFilter, TextureMagFilter magFilter)
{
int textureId = GL.GenTexture();
GL.ActiveTexture(unit);
GL.BindTexture(TextureTarget.Texture2D, textureId);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)minFilter);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)magFilter);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, texture.Width, texture.Height, 0,
PixelFormat.Bgra, PixelType.UnsignedByte, IntPtr.Zero);
var bmpData = texture.LockBits(new Rectangle(0, 0, texture.Width, texture.Height),
ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexSubImage2D(TextureTarget.Texture2D, 0, 0, 0, texture.Width, texture.Height, PixelFormat.Bgra,
PixelType.UnsignedByte, bmpData.Scan0);
texture.UnlockBits(bmpData);
GL.BindTexture(TextureTarget.Texture2D, 0);
return(textureId);
}
public void UseTexture(string textureName, string shader, string uniformName)
{
if (!_textureHandleDictionary.ContainsKey(textureName))
{
throw new ApplicationException("Texture has to be added before using");
}
GL.UseProgram(_shaderHandleDictionary[shader]);
var textureInfo = _textureHandleDictionary[textureName];
GL.ActiveTexture(TextureUnit.Texture0 + textureInfo.Unit);
GL.BindTexture(TextureTarget.Texture2D, textureInfo.Handle);
int location = GL.GetUniformLocation(_shaderHandleDictionary[shader], uniformName);
if (location != -1)
{
int textureUnitIndex = textureInfo.Unit;
GL.Uniform1(location, textureUnitIndex);
}
}
