public void GetBackBufferData <T>(T[] data) where T : struct
{
// Store off the old frame buffer components
uint prevReadBuffer = GLDevice.CurrentReadFramebuffer;
GLDevice.BindReadFramebuffer(GLDevice.Backbuffer.Handle);
GCHandle ptr = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
GLDevice.glReadPixels(
0, 0,
GLDevice.Backbuffer.Width,
GLDevice.Backbuffer.Height,
OpenGLDevice.GLenum.GL_RGBA,
OpenGLDevice.GLenum.GL_UNSIGNED_BYTE,
ptr.AddrOfPinnedObject()
);
}
finally
{
ptr.Free();
}
// Restore old buffer components
GLDevice.BindReadFramebuffer(prevReadBuffer);
// Now we get to do a software-based flip! Yes, really! -flibit
int width = GLDevice.Backbuffer.Width;
int height = GLDevice.Backbuffer.Height;
int pitch = width * 4 / Marshal.SizeOf(typeof(T));
T[] tempRow = new T[pitch];
for (int row = 0; row < height / 2; row += 1)
{
Array.Copy(data, row * pitch, tempRow, 0, pitch);
Array.Copy(data, (height - row - 1) * pitch, data, row * pitch, pitch);
Array.Copy(tempRow, 0, data, (height - row - 1) * pitch, pitch);
}
}