Re: [Libvisual-devel] Re: Release planning, quality release upcoming week.

[Vitaly V. B. <vit...@us...>]

On Wed, 29 Sep 2004 22:05:49 +0200
Dennis Smit <sy...@yo...> wrote:

> On Wed, 2004-09-29 at 21:36 +0100, salsaman wrote:
> > Actually, what would be *really* nice is if a host application could set 
> > a random seed as in:
> > 
> > visual_actor_set_seed(uint32_t seed);
> > 
> > visual_actor_set_seed(123456);  // set seed to 123456
> > 
> > visual_actor_set_seed(0); // let libvisual choose a (pseudo random) seed
> 
> Yes that would be kinda nice, but it's difficult to do because all the 
> plugins need many changes to support this correctly. And the plugins
> we interface through an API would just not support this. So it's kinda
> hard.

Hm, I don't think it's hard. :) just few lines of code.

Fast way to do this is to define these globals:
void visual_set_seed(uint32_t seed);
uint32_t visual_get_seed();
uint32_t visual_random();

With no multi-threading everything should be absolutely reproducible ;)

Next, this plugin-specific api:

void visual_plugin_set_seed(VisPluginInfo*, uint32_t seed);
uint32_t visual_plugin_get_seed(VisPluginInfo*);
void visual_plugin_random(VisPluginInfo*);

state of the random number generation algo will be strored in VisPluginInfo.

One thing: we need to borrow nice pseudo-random numbger gen algo.

OK?

-- 
Vitaly
GPG Key ID: F95A23B9