Re: OpenGL-ES

James Amendolagine wrote:
> On Thu, 2004-09-16 at 13:41, Mike Houston wrote:
> 
>>I don't think anyone is currently working on this, but the extensions 
>>should be easy to add if you were so inclined.  You can pretty much just 
>>replicate the floating point versions and use the new types.
>>
>>The EGS stuff looks to be more tricky...
> 
> Actually I believe it's EGL..
> 
> 
> By the way, I've just started working with Chromium (a couple of weeks
> ago), and I'm very impressed. 
> 
> 
> So if no-one has done this before, I'll just jump in and do it myself. 
> 
> 
> I don't understand the internals well enough yet to have a very useful
> opinion, but one of my concerns with adding the calls as extensions is
> will the SPU's still work? ie will the state tracking still be valid?
> 
> 
> When any of the OpenGL version of these ES calls are made: 
> glClearColorx
> glClearDepthf
> glClearDepthx
> glColor4x
> glDepthRangef
> glDepthRangex
> 
> I imagine that chromium records the state. I guess that I could just
> replicate the state management that is being done within the associated
> OpenGL Chromium call. 
> 
> so I add a call glClearColorx, and look at the origional glClearColor,
> and just replicate most of the function...
> 
> It looks like this would be done in state_tracker/state_buffer.c

Would it be feasible to simply translate the glFoox functions into the 
corresponding conventional OpenGL functions at the dispatch layer? 
That is:

void glClearDepthx(GLclampx value)
{
    glClearDepth(FixedToDouble(value));
}

That could be implemented in the opengl_stub/* files fairly easily, I 
think, without having to touch the rest of the system.

I haven't looked at the ES functions closely enough to know if there's 
any potential pitfalls.

-Brian


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