/// <summary>
/// This is the easiest constructor to use when you already have a texture, and you
/// want to draw into it. Just pass the texture in, and the RenderTarget will be
/// constructed to match the size.
/// </summary>
/// <param name="gi"></param>
/// <param name="texture"></param>
public GLRenderTarget(GLTexture2D texture)
: this(texture.GI)
{
fWidth = texture.Width;
fHeight = texture.Height;
FrameBuffer.Bind();
// Create the render buffer to be attached as a depth
// buffer.
fDepthBuffer = new GLRenderBuffer(fGI);
fDepthBuffer.Bind();
fDepthBuffer.AllocateStorage(fWidth, fHeight, gl.GL_DEPTH_COMPONENT);
fFrameBuffer.AttachDepthBuffer(fDepthBuffer);
// Create the texture object to be attached as color buffer
AttachColorBuffer(texture, ColorBufferAttachPoint.Position0);
FrameBuffer.Unbind();
}
void CreateDepthBuffer(int width, int height)
{
// Create the render buffer to be attached as a depth
// buffer.
fDepthBuffer = new GLRenderBuffer(fGI);
fDepthBuffer.Bind();
fDepthBuffer.AllocateStorage(width, height, gl.GL_DEPTH_COMPONENT);
fFrameBuffer.AttachDepthBuffer(fDepthBuffer);
}