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();
}));
}
private void returnViewport()
{
GLWrapper.PopScissorOffset();
GLWrapper.PopViewport();
GLWrapper.PopScissor();
GLWrapper.PopMaskingInfo();
}
protected override void PostDraw()
{
frameBuffer.Unbind();
GLWrapper.PopOrtho();
GLWrapper.PopViewport();
GLWrapper.SetBlend(BlendingFactorSrc.One, BlendingFactorDest.OneMinusSrcAlpha);
Rectangle textureRect = new Rectangle(0, frameBuffer.Texture.Height, frameBuffer.Texture.Width, -frameBuffer.Texture.Height);
frameBuffer.Texture.Draw(ScreenSpaceDrawQuad, textureRect, DrawInfo.Colour, quadBatch);
// In the case of nested framebuffer containerse we need to draw to
// the last framebuffer container immediately, so let's force it
ActiveBatch.Draw();
}
private void returnViewport()
{
GLWrapper.PopViewport();
GLWrapper.PopMaskingInfo();
}
protected override void PostDrawMask(FrameBuffer clippingMask)
{
GLWrapper.PopViewport();
clippingMask.Unbind();
}
