I got simple code that uses SpriteBatch to draw a texture onto a RenderTarget2D...
private void drawScene(GameTime g)
{
GraphicsDevice.Clear(skyColor);
GraphicsDevice.SetRenderTarget(targetScene);
drawSunAndMoon();
effect.Fog = true;
GraphicsDevice.SetVertexBuffer(line);
effect.MainEffect.CurrentTechnique.Passes[0].Apply();
GraphicsDevice.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 2);
GraphicsDevice.SetRenderTarget(null);
SceneTexture = targetScene;
}
private void drawPostProcessing(GameTime g)
{
effect.SceneTexture = SceneTexture;
GraphicsDevice.SetRenderTarget(targetBloom);
spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, null, null, null);
{
if(Bloom) effect.BlurEffect.CurrentTechnique.Passes[0].Apply();
spriteBatch.Draw(targetScene, new Rectangle(0, 0, Window.ClientBounds.Width, Window.ClientBounds.Height), Color.White);
}
spriteBatch.End();
BloomTexture = targetBloom;
GraphicsDevice.SetRenderTarget(null);
}
Both methods are called from Draw(GameTime gameTime). First drawScene is called, then drawPostProcessing is called.
The thing is, I can't run the code because "the render target must not be set on the device when it is used as a texture."
at line spriteBatch.Draw(targetScene, new Rectangle(0, 0, Window.ClientBounds.Width, Window.ClientBounds.Height), Color.White);
I already found the solution, which is to draw the actual renderTarget (targetScene) to the texture so it doesn't create a reference to the loaded rendertarget.
However, to my knowledge, the only way of doing this is to write:
GraphicsDevice.SetRenderTarget(OutputTarget)
SpriteBatch.Draw(InputTarget, ...)
GraphicsDevice.SetRenderTarget(null)
Which encounters the same exact problem I'm having right now.
So, the question I'm asking is: how would I render InputTarget to OutputTarget without reference issues?
