private InvokeOnDisposal establishFrameBufferViewport(Vector2 roundedSize)
{
// Disable masking for generating the frame buffer since masking will be re-applied
// when actually drawing later on anyways. This allows more information to be captured
// in the frame buffer and helps with cached buffers being re-used.
Rectangle screenSpaceMaskingRect = new Rectangle((int)Math.Floor(ScreenSpaceDrawRectangle.X), (int)Math.Floor(ScreenSpaceDrawRectangle.Y), (int)roundedSize.X + 1, (int)roundedSize.Y + 1);
GLWrapper.PushMaskingInfo(new MaskingInfo
{
ScreenSpaceAABB = screenSpaceMaskingRect,
MaskingRect = ScreenSpaceDrawRectangle,
ToMaskingSpace = Matrix3.Identity,
BlendRange = 1,
AlphaExponent = 1,
}, true);
// Match viewport to FrameBuffer such that we don't draw unnecessary pixels.
GLWrapper.PushViewport(new Rectangle(0, 0, (int)roundedSize.X, (int)roundedSize.Y));
return(new InvokeOnDisposal(delegate
{
GLWrapper.PopViewport();
GLWrapper.PopMaskingInfo();
}));
}
protected override void PreDraw()
{
frameBuffer.Bind();
// Set viewport to the texture size
GLWrapper.PushViewport(new Rectangle(0, 0, frameBuffer.Texture.Width, frameBuffer.Texture.Height));
// We need to draw children as if they were zero-based to the top-left of the texture
// so we make the new zero be this container's position without affecting children in any negative ways
GLWrapper.PushOrtho(new Rectangle((int)ScreenSpaceDrawQuad.TopLeft.X, (int)ScreenSpaceDrawQuad.TopLeft.Y, frameBuffer.Texture.Width, frameBuffer.Texture.Height));
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit | ClearBufferMask.StencilBufferBit);
}
protected override void PreDrawMask(FrameBuffer clippingMask)
{
clippingMask.Bind();
GLWrapper.PushViewport(new RectangleI(0, 0, clippingMask.Texture.Width, clippingMask.Texture.Height));
GLWrapper.Clear(new ClearInfo(Colour4.White));
GLWrapper.SetBlend(new BlendingParameters
{
Source = BlendingType.Zero,
Destination = BlendingType.OneMinusSrcColor,
SourceAlpha = BlendingType.Zero,
DestinationAlpha = BlendingType.OneMinusSrcAlpha,
});
}
private IDisposable establishFrameBufferViewport()
{
// Disable masking for generating the frame buffer since masking will be re-applied
// when actually drawing later on anyways. This allows more information to be captured
// in the frame buffer and helps with cached buffers being re-used.
RectangleI screenSpaceMaskingRect = new RectangleI((int)Math.Floor(screenSpaceDrawRectangle.X), (int)Math.Floor(screenSpaceDrawRectangle.Y), (int)frameBufferSize.X + 1, (int)frameBufferSize.Y + 1);
GLWrapper.PushMaskingInfo(new MaskingInfo
{
ScreenSpaceAABB = screenSpaceMaskingRect,
MaskingRect = screenSpaceDrawRectangle,
ToMaskingSpace = Matrix3.Identity,
BlendRange = 1,
AlphaExponent = 1,
}, true);
// Match viewport to FrameBuffer such that we don't draw unnecessary pixels.
GLWrapper.PushViewport(new RectangleI(0, 0, (int)frameBufferSize.X, (int)frameBufferSize.Y));
GLWrapper.PushScissor(new RectangleI(0, 0, (int)frameBufferSize.X, (int)frameBufferSize.Y));
GLWrapper.PushScissorOffset(screenSpaceMaskingRect.Location);
return(new ValueInvokeOnDisposal <BufferedDrawNode>(this, d => d.returnViewport()));
}