c# - XNA RenderTarget Preserve Contents -


i'm trying load texture rendertarget once on first draw , preserve contents draw same texture every frame without recreating it.

this code have doesnt work , shows empty texture area , 

rendertarget2d rtarget = null;         /// <summary>         /// called when game should draw itself.         /// </summary>         /// <param name="gametime">provides snapshot of timing values.</param>         protected override void draw(gametime gametime)         {             graphicsdevice.clear(gamebackgroundcolor);              spritebatch.begin();              if (rtarget == null)             {                 rtarget = new rendertarget2d(game.graphics.graphicsdevice,                                            game.graphics.graphicsdevice.presentationparameters.backbufferwidth,                                            game.graphics.graphicsdevice.presentationparameters.backbufferheight,                                            false,                                            game.graphics.graphicsdevice.presentationparameters.backbufferformat,                                            depthformat.depth24, 0, rendertargetusage.preservecontents);                  game.graphics.graphicsdevice.setrendertarget(rtarget);                  game.graphics.graphicsdevice.clear(color.black);                  game.spritebatch.draw(contentmanager.load<texture2d>("tiles"), new rectangle(0, 0, 100, 100), color.white);                  game.graphics.graphicsdevice.setrendertarget(null);             }              spritebatch.draw(rtarget, new rectangle(0, 0,400, 400), color.white);              //draw character             character.draw(gametime);              spritebatch.end();              base.draw(gametime);         }

and end result: failed render texture correctly

can explain doing wrong??

i think forgot game.spritebatch.begin() , end() render target. think should move spritebatch.end() close draw(rtarget... method call (especially if game.spritebatch , spritebatch same variable).

graphicsdevice.clear(gamebackgroundcolor); if (rtarget == null) {     rtarget = new rendertarget2d(game.graphics.graphicsdevice,         game.graphics.graphicsdevice.presentationparameters.backbufferwidth,         game.graphics.graphicsdevice.presentationparameters.backbufferheight,         false,         game.graphics.graphicsdevice.presentationparameters.backbufferformat,         depthformat.depth24, 0, rendertargetusage.preservecontents);      game.graphics.graphicsdevice.setrendertarget(rtarget);     game.graphics.graphicsdevice.clear(color.black);      game.spritebatch.begin();     game.spritebatch.draw(contentmanager.load<texture2d>("tiles"), new rectangle(0, 0, 100, 100), color.white);     game.spritebatch.end();     game.graphics.graphicsdevice.setrendertarget(null); }  spritebatch.begin(); spritebatch.draw(rtarget, new rectangle(0, 0,400, 400), color.white);  //draw character character.draw(gametime);  spritebatch.end();  base.draw(gametime);

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