[fpc-devel] sdlgraph, pre-alpha
jonas.maebe at elis.ugent.be
Wed Aug 22 21:56:47 CEST 2007
On 22 Aug 2007, at 20:59, Evgeniy Ivanov wrote:
> Hm... I've tried such thing:
> procedure sdlgraph_HLine(x,x2,y: smallint);
> The same. I will try to find the true way, but I'm not sure that it
> can be
> without locking overhead. I reimplement Bar3d with adding locking -
> quick. I think it is the fastest HLine implementation
I guess the problem is that you blit the entire screen after every
drawing operation. It will be faster when drawing lines at a time,
but still slow. In theory, the flipping could/should be done from a
separate thread, which only does the flipping once per vertical
refresh of the monitor. I don't know whether SDL provides access to
this information though.
>> Bar3D's speed is fine if you have a fast hline implementation (like
>> for e.g. go32v2 in most modes).
> It's asm, it should be faster than pascal code.
That is not why it is that much faster. That code would be almost
equally fast if it were written in Pascal. I wrote it in assembler
because I liked doing that, not because it was needed for speed reasons.
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