forums.ps2dev.org

JJPeerless · Joined: 20 Jun 2005 Posts: 82

using pgBitBlt, is it possible to BitBlt to something other than the "screen"..does the psp only have one screen buffer? or can i have like a Graphics object to draw to..then blit that to the screen buffer and then flip that..

i want to be able to blit to other surfaces before flipping them to the screen..

inomine · Joined: 05 May 2005 Posts: 53

Have a look at the "Unlimited sin ball" demo from AloneTrio, the source is pretty straight forward to understand. It does what you are looking for, for a maximum of 7 buffers.

If you don't understand it after looking at it for a while come back and we'll take it from there.

JJPeerless · Joined: 20 Jun 2005 Posts: 82

if you wouldnt mind me asking, where do i get this demo?

JJPeerless · Joined: 20 Jun 2005 Posts: 82

just found it, nevermind

JJPeerless · Joined: 20 Jun 2005 Posts: 82

dont really get it tho..

pgScreenFrame

does it have to do with that?

JJPeerless · Joined: 20 Jun 2005 Posts: 82

all i really wanna be able to do is.. blit to a second buffer... then clip that so its the size of the screen 480x272..and then flip that to the screen..

thats all..

inomine · Joined: 05 May 2005 Posts: 53

Right, it's as simple as this.

The PSP has 2Mb of VRAM, this is what the nice pointer that you have is pointing to the top of. Obviously 272 lines at 512 pixels does not use all of it, so all you have to do to get a new framebuffer is write further down in the RAM than the end of the screen of the current buffer. Then all you do is call

JJPeerless · Joined: 20 Jun 2005 Posts: 82

im using Nem's PG library to do all my graphics stuff..
i dont really understand what you are trying to say..

do i have to edit nem's pg stuff..because his pgbitblt function only blits to the top buffer?

is that it?

inomine · Joined: 05 May 2005 Posts: 53

Nem's stuff is nice but if you want to get anywhere I would say ditch it and make your own, that way you will actually understand what is happening a lot better.

JJPeerless · Joined: 20 Jun 2005 Posts: 82

i totally agree..because i dont know how nem's stuff works..i only know how to use it..

where can i learn about the psp's functions he used to do what he did..

jboldiga · Joined: 20 Jun 2005 Posts: 27

You can also point to another area in vram like inomine said and use that as a texture. Rendering to a texture can produce some nice effects. As for how to get started on psp, you might want to look at how things work on PS2 since its heavily documented and would give a firm grasp of the architecture before diving into psp dev. There are a bunch of api lib calls here on the forums.

inomine · Joined: 05 May 2005 Posts: 53