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Coldbird
Joined: 08 Feb 2007
Posts: 155
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 Posted: Sun Apr 18, 2010 8:30 pm Post subject: GU + Wallpaper Blit + OSK |
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I wanted to ask for something simple, I want to load a 480x272 wallpaper image and get it onto screen using the GU, if possible in the most efficient way.
Then I want to render the Sony OSK ontop of it for querying 4 inputs...
The Sony OSK thing I already have working, but Im still fighting with getting the wallpaper displayed.
Someone has a simple sample at hand maybe? Ive been butchering the PSPSDK samples for some time now without the awaited success.
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Oby1Chick
Joined: 13 Feb 2010
Posts: 24
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| Posted: Mon Apr 19, 2010 2:38 am Post subject: |
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Hey Coldbird, I am not sure, but I think the most efficient way to display an image on the screen is the following command :
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blitAlphaImageToScreen()
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You need the include the library needed of course. |
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Coldbird
Joined: 08 Feb 2007
Posts: 155
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| Posted: Mon Apr 19, 2010 4:14 am Post subject: |
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Which is?
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Torch
Joined: 28 May 2008
Posts: 842
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| Posted: Tue Apr 20, 2010 6:03 am Post subject: |
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graphics.c from luaplayer source code.
Of course, its really inefficient to call it's functions repeatedly as it does a full read raw image from main memory to draw to screen cycle for each one of those. |
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Coldbird
Joined: 08 Feb 2007
Posts: 155
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| Posted: Tue Apr 20, 2010 6:08 am Post subject: |
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| Torch wrote: | | Of course, its really inefficient to call it's functions repeatedly as it does a full read raw image from main memory to draw to screen cycle for each one of those. |
I guess its bearable for this special case as I just want to get the job done.
But still im interested, how would you go about optimizing this?
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Davee
Joined: 22 Jun 2009
Posts: 59
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| Posted: Tue Apr 20, 2010 6:50 am Post subject: |
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| Coldbird wrote: | | Torch wrote: | | Of course, its really inefficient to call it's functions repeatedly as it does a full read raw image from main memory to draw to screen cycle for each one of those. |
I guess its bearable for this special case as I just want to get the job done.
But still im interested, how would you go about optimizing this? |
By learning how the GU operates and then formatting data to make best use of it of course. |
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anmabagima
Joined: 01 Oct 2009
Posts: 96
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| Posted: Tue Apr 20, 2010 7:19 pm Post subject: |
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Hi,
using the gu to draw the wallpaper means, that you are using the image as a texture for rendering a sprite which is of the smae size as your screen. You can optimize in some ways.
First: never draw the sprite at once, draw it in eg. 64 pixel wide columns
Second: swizzle the texture for optimized data reads
Third: store the texture in the VRAM to get additional speed |
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