OpenGL Renderer

[mwstrom]

Since I had an Opengl Course this quarter I made a renderer. Its fairly basic but gets the job done. Its still under development but I included a link if anyone wants to try it out.


[color=0000AA]OpenGLRenderer[/color]


---Mark

[CrazyEddie]

Cool, I'll certainly check this over

Once you've finished (or whenever), are you willing to LGPL this and let me add it to the main code base? An OpenGL renderer is one of the main 'missing' components of the system

CE.

[mwstrom]

You are free to include it as you like. I still need to get permission for the use of the targa loader code.

--Mark

[CrazyEddie]

That's great, thanks

With reference to the targa loading code, I am very likely to extend the renderer to use DevIL for image loading, so if you can't get the go ahead to use that code, all is not lost. Though if you do get permission, it would then be possible to have a compile-time option for people who would prefer a more lightweight solution, and thus eliminate the need for another external dependency (that being the above metioned DevIL).

Whatever the outcome, this is all good stuff

CE.

[mwstrom]

CE,

I'm having problems with the cusors image not displaying. I noticed in the xml file has offset values and I'm not sure if this is the problem. I did nothing with offsets in my opengl implementation.

--Mark

[CrazyEddie]

It shouldn't be that; the offsets are handled at a higher level and are applied before the renderer code gets called...

The cursor is drawn via a call to renderQuadDirect, so there may be a problem there? Hopefully i'll get round to having a proper look at this myself later on today, so if you haven't fixed if before then, I may be able to spot the problem (though I didn't notice anything glaringly obvious from having a quick glance at the code).

CE.

[mwstrom]

Thanks for the tip. I was missing a call to enable the texture in the render quad direct function. I upped my new changes to the code to the previous link. Feel free to modify or change the code as you like.

---Mark

[CrazyEddie]

Cool, glad you have it working.

Any word on the permission for that that .tga loading code yet?

I probably wont get to try this out properly until tomorrow or Thursday; I've been bogged down writing docs, and planning some kind of sample framework for the first beta release...

CE.

[mwstrom]

Still no word on the Targa loader yet, but I cleaned up the code a bunch and switched from Quads to Triangles. I also fixed the issue with alpha channels . When I get some time I want to add OpenGL vertex buffer support.

--Mark

[mwstrom]

CE,

I was given the okay to use the Targa loader. I am still debugging some issues with saving opengl states during pre and post render.

--Mark

[CrazyEddie]

That's great news on the Targa loader

With reference to saving states and what have you, depeding on the actual usage, the renderer may or may not actually be the best place to put such things...

If the app is relying on the states being untouched from the previous frame (and as such trying to get a performance boost due to minimal state changes), this is basically circumvented by having the Gui system save & restore the states; under these circumstances it would probably be cheaper to have the app set up which ever states it relies on at the start of each frame. Obviously I'm not suggesting that this be a requirement, since there are cases where each of the approaches will out perform the other; an settable option for this kind of thing would be highly desirable. The (currently, highly reglected) D3D renderers do no state saving at all, though when I re-visit those to spruce them up a bit I may add a similar option.

CE.

[mwstrom]

Most of the bugs should be worked out. I went with ease of use over cutting edge performance. The above link should contain the current version.

--Mark

[CrazyEddie]

Okay Ease of use is always good.

I'm hoping to get this renderer added to CVS over the next week or so

CE.

[mwstrom]

Here is a link to a simple opengl project.

http://home.comcast.net/~strommw/simpleproject.rar