Hello!
DirectDraw can do mirror blitting of an image (with flags
DDBLTFX_MIRRORLEFTRIGHT and DDBLTFX_MIRRORUPDOWN). I need same feature
for my SDL program under Linux. As far as I know there are no such tool
in SDL library for doing this. So, how can I implement this feature?
Is there any libraries or sample code?
Thank you very much in advance.
Evgeny Bronnikov.
For maximum performance on all backends, this would have to be
implemented in SDL, rather than in an add-on library. One reason to
add this to SDL is that you can take advantage of DirectX, OpenGL
[glSDL] and other targets that can do this in hardware. Another
reason would be that SDL’s s/w blitters could probably be made to do
this without much overhead. In both cases, having this feature would
eliminate the need for doing the flipping at load/init time, or on
the fly into temporary surfaces.
Then again, one reason not to bother with this would be that there
is really little need for it in “real” applications. Most modern
games have rendered or hand drawn graphics with a “lightsourced” 3D
look, meaning that you can’t flip it without ruining the appearance.
The only really useful solution would include free rotation along with
bumpmapping, and that’s probably better left to custom (ie
specialised, highly optimised) blitting code, OpenGL or Direct3D. (As
opposed to pretty much all other targets, OpenGL and Direct3D can
accelerate both rotation and bumpmapping.)
//David Olofson - Programmer, Composer, Open Source Advocate
.- Audiality -----------------------------------------------.
| Free/Open Source audio engine for games and multimedia. |
| MIDI, modular synthesis, real time effects, scripting,… |
`-----------------------------------> http://audiality.org -’
— http://olofson.net — http://www.reologica.se —On Saturday 22 November 2003 16.02, E$h wrote:
Hello!
DirectDraw can do mirror blitting of an image (with flags
DDBLTFX_MIRRORLEFTRIGHT and DDBLTFX_MIRRORUPDOWN). I need same
feature for my SDL program under Linux. As far as I know there are
no such tool in SDL library for doing this. So, how can I implement
this feature? Is there any libraries or sample code?
Thank you very much in advance.