c# - How do I pause the redraw in XNA? -


i made xna image viewer, redraws scene, if it's not changing, , it's making netbook burn hell, i'd pause drawing when nothing's changing.

reducing framerate 1 one way keep cool, results in laggy output.

how prevent redraw while there no input?

this problem solved, problem found — game consumes lot of cpu when window in focus, when it's not, takes 1% of cpu. see question details on how solve other problem:

how reduce xna game cpu usage while nothing worth computing happening?

you can use game.supressdraw method purpose. remarks @ link:

call method during update prevent calls draw until after next call update. method can used on small devices conserve battery life if display not change result of update. example, if screen static no background animations, player input can examined during update determine whether player performing action. if no input detected, method allows game skip drawing until next update.

as example, following code call draw function once. when tested noticed cpu usage high (70%) without suppressdraw call. when using supressdraw, cpu usage dropped dramatically (to less 15%). numbers may vary.

public class game1 : microsoft.xna.framework.game {     ...     private bool _drawn = false;     protected override void update(gametime gametime)     {         if (_drawn)             suppressdraw();     }      protected override void draw(gametime gametime)     {         graphicsdevice.clear(color.cornflowerblue);         spritebatch.begin();         /* draw stuff here */         spritebatch.end();          _drawn = true;     }     ... }

note supressdraw suppresses 1 draw call. prevent more calls draw, have continually call supressdraw in update. makes sense.


Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

node.js - Getting the socket id,user id pair of a logged in user(s) -

i have web application done using node js , in it,i have authentication system requires users log in before can access pages. have 2 pages,the homepage , updates page. from read docs,a new socket id issued when user opens tab in browser. me being admin,i know socket id of logged in user , more so,the socket id,logged in user id pair logged in users. what method can use socket id,logged in user id pair make sure broadcast realtime info users online?.
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua
Read more