private static Texture2D CreateTexture2DFromBitmap(Bitmap bitmap, TextureFormat format, bool generateMipmaps, TextureTarget textureTarget)
{
using (WritePixelBuffer pixelBuffer = Device.CreateWritePixelBuffer(PixelBufferHint.Stream,
BitmapAlgorithms.SizeOfPixelsInBytes(bitmap)))
{
pixelBuffer.CopyFromBitmap(bitmap);
Texture2DDescription description = new Texture2DDescription(bitmap.Width, bitmap.Height, format, generateMipmaps);
Texture2D texture = new Texture2DGL3x(description, textureTarget);
texture.CopyFromBuffer(pixelBuffer,
TextureUtility.ImagingPixelFormatToImageFormat(bitmap.PixelFormat),
TextureUtility.ImagingPixelFormatToDatatype(bitmap.PixelFormat));
return(texture);
}
}
public void CopyFromBitmap(Bitmap bitmap)
{
Bitmap lockedBitmap;
if (BitmapAlgorithms.RowOrder(bitmap) == ImageRowOrder.TopToBottom)
{
//
// OpenGL wants rows bottom to top.
//
Bitmap flippedBitmap = (Bitmap)bitmap.Clone();
flippedBitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);
lockedBitmap = flippedBitmap;
}
else
{
lockedBitmap = bitmap;
}
BitmapData lockedPixels = lockedBitmap.LockBits(new Rectangle(
0, 0, lockedBitmap.Width, lockedBitmap.Height),
ImageLockMode.ReadOnly, lockedBitmap.PixelFormat);
int sizeInBytes = lockedPixels.Stride * lockedPixels.Height;
if (sizeInBytes > _sizeInBytes)
{
throw new ArgumentException(
"bitmap's size in bytes must be less than or equal to SizeInBytes.",
"bitmap");
}
Bind();
GL.BufferSubData(_type,
new IntPtr(),
new IntPtr(sizeInBytes),
lockedPixels.Scan0);
lockedBitmap.UnlockBits(lockedPixels);
}
public void WritePixelBufferBitmap()
{
using (Bitmap bitmap = new Bitmap(1, 1))
using (GraphicsWindow window = Device.CreateWindow(1, 1))
using (WritePixelBuffer pixelBuffer = Device.CreateWritePixelBuffer(PixelBufferHint.Stream,
BitmapAlgorithms.SizeOfPixelsInBytes(bitmap)))
{
Color color = Color.FromArgb(0, 1, 2, 3);
bitmap.SetPixel(0, 0, color);
pixelBuffer.CopyFromBitmap(bitmap);
//
// Verify read back - comes back BGRA
//
BlittableBGRA[] readBackPixel = pixelBuffer.CopyToSystemMemory <BlittableBGRA>();
Assert.AreEqual(color.R, readBackPixel[0].R);
Assert.AreEqual(color.G, readBackPixel[0].G);
Assert.AreEqual(color.B, readBackPixel[0].B);
Assert.AreEqual(color.A, readBackPixel[0].A);
//
// Verify read back into bitmap
//
using (Bitmap readBackBitmap = pixelBuffer.CopyToBitmap(1, 1, PixelFormat.Format32bppArgb))
{
Assert.AreEqual(color, readBackBitmap.GetPixel(0, 0));
}
}
}
