DirectDraw over Direct3D

Lionel Ulmer lionel.ulmer at
Mon Dec 5 14:22:28 CST 2005

On Sun, Dec 04, 2005 at 07:27:29PM -0700, Jesse Allen wrote:
> Is Starcraft really that slow?   How does this compare with using DGA?

Nothing can beat DGA (actually DGA2 as you would need depth change to go to
8 bit colours to run StarCraft) in raw speed as it is the method which does
copy the less memory over.

> This patch seems similar to glSDL where it wraps SDL's 2d API to
> OpenGL. The good thing about this it can provide acceleration and not
> require root like DGA.  The bad thing with this idea is that it can't
> be used on older video cards or even some newer ones that lack proper
> direct rendering. 

The problem is not direct rendering, it's more 'basic' OpenGL acceleration.

> Am I correct that even when just doing depth
> conversions, without direct rendering it will still be slow?

If you have accelerated OpenGL rendering but without direct access, I think
that it should still be faster than the current method (as you would 1) move
less data over the GPU bus and 2) do less CPU computation on a big amount of


		 Lionel Ulmer -

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