public sealed override void Draw(Action <TexturedVertex2D> vertexAction)
{
if (RequiresRedraw)
{
SharedData.ResetCurrentEffectBuffer();
using (establishFrameBufferViewport())
{
// Fill the frame buffer with drawn children
using (BindFrameBuffer(SharedData.MainBuffer))
{
// We need to draw children as if they were zero-based to the top-left of the texture.
// We can do this by adding a translation component to our (orthogonal) projection matrix.
GLWrapper.PushOrtho(screenSpaceDrawRectangle);
GLWrapper.Clear(new ClearInfo(backgroundColour));
Child.Draw(vertexAction);
GLWrapper.PopOrtho();
}
PopulateContents();
}
SharedData.DrawVersion = GetDrawVersion();
}
Shader.Bind();
base.Draw(vertexAction);
DrawContents();
Shader.Unbind();
}
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);
}
private void drawChildren(IVertexBatch vertexBatch, Vector2 frameBufferSize)
{
// Fill the frame buffer with drawn children
using (bindFrameBuffer(currentFrameBuffer, frameBufferSize))
{
// We need to draw children as if they were zero-based to the top-left of the texture.
// We can do this by adding a translation component to our (orthogonal) projection matrix.
GLWrapper.PushOrtho(ScreenSpaceDrawRectangle);
GLWrapper.ClearColour(BackgroundColour);
base.Draw(vertexBatch);
GLWrapper.PopOrtho();
}
}