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Author Topic: if self.isCoder(): post() #Programming Thread  (Read 902773 times)

Valid_Dark

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4005 on: February 26, 2013, 04:42:57 am »

 :-[

it was running a function every frame, when really it only needed to be ran when that part of the screen needed to be updated,
so instead of updating that part of the screen every frame, that section is only set to update when something changes.

The function included setting, blitting, and freeing multiple surfaces as well as setting a handful of variables.

 
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4006 on: February 26, 2013, 01:27:12 pm »

:-[

it was running a function every frame, when really it only needed to be ran when that part of the screen needed to be updated,
so instead of updating that part of the screen every frame, that section is only set to update when something changes.

The function included setting, blitting, and freeing multiple surfaces as well as setting a handful of variables.
Setting and freeing multiple surfaces? Sounds CPU-intensive. It's probably easier to just keep and reuse those surfaces.
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4007 on: February 26, 2013, 05:02:28 pm »

The way it's set up, is there are 5 or so surfaces available for the menus.   when the menu changes, so do all of the surfaces.  I thought it would be a better option than keeping ALL of the surfaces for ALL of the menus in memory at the same time and just switching them out.  Its a tradeout, cpu for ram, but both are so small that it doesn't really make a dent in either one way or another.

But yeah, NORMALLY you'd want to keep a surface in memory if you think it's going to be used again. 
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alway

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4008 on: February 26, 2013, 08:44:39 pm »

The way it's set up, is there are 5 or so surfaces available for the menus.   when the menu changes, so do all of the surfaces.  I thought it would be a better option than keeping ALL of the surfaces for ALL of the menus in memory at the same time and just switching them out.  Its a tradeout, cpu for ram, but both are so small that it doesn't really make a dent in either one way or another.

But yeah, NORMALLY you'd want to keep a surface in memory if you think it's going to be used again.
Memory is cheap. If something comes down to a question of memory vs cpu time, you should almost always spend more memory to save CPU time simply because you have so incredibly much space in memory.

Also keep in mind that most things with graphics involve communication back and forth between the CPU and GPU. I can't say for certain exactly how SDL is doing that surface modification, as it changes based on how you're compiling it (SDL is basically a shiny wrapper which incorporates a bunch of other graphics libraries like DirectX and OpenGL, then figures out which one to use based on how you use it/what system you're on). However, I can say that the surface modification very likely includes such CPU-GPU communications; which tend to be very slow. Which is why doing it every frame was eating up several times more computation time than the rest of your code combined.

In this case, it's not too important, as it is just a menu opening (though you may get frame stuttering upon opening it), but just keep this in mind when using it in the future. Modifying surfaces, or worse, recreating them, is incredibly expensive.
« Last Edit: February 26, 2013, 08:46:58 pm by alway »
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4009 on: February 26, 2013, 11:23:51 pm »

Using SDL withough DirectX or OpenGL, so software accelerated instead of hardware accelerated. 
meaning not using the GPU at all.
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4010 on: February 26, 2013, 11:34:32 pm »

It automatically uses OpenGL or DirectX, is what alway is saying I think.
Software drawing is slooooooow. D:
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4011 on: February 27, 2013, 05:06:53 am »

Does Dirty Rectangles have any use when you intend to scroll the whole screen for significant periods of time (A 2D game where the camera follows the player, causing the entire background to move)? Because it would seem that I would need to program my game to be fast enough to update the entire screen anyway.

Also my program using software blitting is running at a good 100 fps (pygame/sdl). Tried to force opengl to see what difference it would make and it segfaulted ::)

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The Darkling Wolf

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Re: if (u.is_programmer) post(); //Programming Thread
« Reply #4012 on: February 27, 2013, 05:27:14 am »

Posting to follow.
« Last Edit: March 14, 2013, 06:23:14 am by The Darkling Wolf »
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alway

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4013 on: February 27, 2013, 05:52:22 am »

Yep, and looking at those, some of them may or may not do some sort of hardware acceleration depending on the weather and what time of the year it is. So as to what it's really doing under the hood, who knows... But in any case, recreating and modifying any drawn surfaces is slow regardless of the method used, whether it's due to GPU communication or simply memcopying a couple megs of data.
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4014 on: February 27, 2013, 06:33:35 am »

But in any case, recreating and modifying any drawn surfaces is slow regardless of the method used, whether it's due to GPU communication or simply memcopying a couple megs of data.

Oh absolutely. Store/reuse/precompute as many surfaces as is possible.
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MagmaMcFry

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4015 on: February 27, 2013, 07:18:41 am »

Posting to follow.
Wait, what? All that time you've been on the forums, your sig says you've been a programmer for quite a long time now, and you posted in this thread only now? Someone must have Python issues. :P
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The Darkling Wolf

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4016 on: February 28, 2013, 06:54:47 am »

I only noticed the durned thread a while ago :P
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4017 on: February 28, 2013, 04:58:24 pm »

How willing are you guys to troubleshoot an assignment I'm working on? It's quite simple and I hate to run to the internet for answers, but I'm not sure what my issue is.
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Re: if self.isCoder(): post() #Programming Thread
« Reply #4018 on: February 28, 2013, 06:13:14 pm »

Ok, take this form. It includes details such as reason for project, language, current known errors and marital status. Just fill it out and we will see what we can do.

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4019 on: February 28, 2013, 06:14:13 pm »

Don't forget your martial status.
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