Viewport bigger than display size issue

SDL Development
1

Hello,
I am using the back buffer to process some OpenGL textures.
When I define a viewport that is bigger than the display rectangle, any data
drawn outside of the display rectangle are lost. (eg. display window: 320,
200 / viewport: 512, 512 )

Is it an expected behavior ?

(using SDL 1.2 on Windows XP)

Thanks for any help,
Franck.

2

–
Jukka-Pekka Manninen

Tools Programmer

From: sdl-bounces@lists.libsdl.org [mailto:sdl-bounces at lists.libsdl.org] On Behalf Of soubok
Sent: 7. hein?kuuta 2009 18:29
To: sdl at lists.libsdl.org
Subject: [SDL] viewport bigger than display size issue

Hello,
I am using the back buffer to process some OpenGL textures.
When I define a viewport that is bigger than the display rectangle, any data drawn outside of the display rectangle are lost. (eg. display window: 320, 200 / viewport: 512, 512 )

Is it an expected behavior ?

(using SDL 1.2 on Windows XP)

Thanks for any help,
Franck.

3

Sorry about the previous; my excuse is that I’m at work and forced to
use Outlook.From: sdl-bounces@lists.libsdl.org [mailto:sdl-bounces at lists.libsdl.org]
On Behalf Of soubok
Subject: [SDL] viewport bigger than display size issue

Hello,
I am using the back buffer to process some OpenGL textures.
When I define a viewport that is bigger than the display rectangle,
any data

drawn outside of the display rectangle are lost. (eg. display window:
320, 200

viewport: 512, 512 )

Is it an expected behavior ?

Yes. You can’t paint where there’s no canvas, or in this case, back
buffer.

You’ll have to render your textures in chunks that fit into the window,
or use one of the off-screen

buffer options. (pbuffer, PBOs, whatever-there-are…)

–

Jukka-Pekka Manninen