Random WIP shots

[PH3NOM]

I have a guess about the bugs you experience on real hardware.

The PVR will freak out when you throw vertices at it that cross the Near Z Clipping Plane, and your video appears to demonstrate the fact.
I think that the column nearest to the screen may be crossing the Near Z Plane.

Try to enable my Near Z Clipping algorithm in the API:

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glEnable(GL_KOS_NEARZ_CLIPPING);

[Jae686]

Good evening.

When

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glEnable(GL_KOS_NEARZ_CLIPPING);

on lxdream it simply shows a blank screen with a matching glclear() color, until the emulator crashes with

Code: Select all

--- Aborting with signal 11 ---
Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
No stack.
Aborted
jaerder@jaerder-G50V ~/development/Projectos Software/vidfdc/dreamcast $ 

I have not tested with real hardware (yet) though.

[Jae686]

Adding support for simple 2d Overlays. (useful to put graphics such as logos, etc on the screen).

[bogglez]

Just added support for rendering polygons with compressed textures or colors to my libgl15.

Code is here: https://bitbucket.org/bogglez/libgl15/s ... ?at=master

[PH3NOM]

bogglez-

Just to be clear, you can bind a VQ compressed texture using my Open GL API, all you need to do is specify the texture format when binding the texture.

After all, that is quite easy to do using KOS

But that reminds me, I do need to clean up the PVR texture memory allocation code, as right now I simply allocate 1/4 of the size in texture memory when the VQ flags are set, instead of actually figuring the exact size of the vq texture.

[bogglez]

bogglez-

Just to be clear, you can bind a VQ compressed texture using my Open GL API, all you need to do is specify the texture format when binding the texture.

After all, that is quite easy to do using KOS

But that reminds me, I do need to clean up the PVR texture memory allocation code, as right now I simply allocate 1/4 of the size in texture memory when the VQ flags are set, instead of actually figuring the exact size of the vq texture.

I saw that you upload compressed textures using glTexImage, but I think it's not supposed to be done there. Shouldn't you use glCompressedTexImage anyway? You can use glTexImage if the internal format is compressed but the source format is not, I think (with the runtime conversion).

[PH3NOM]

[bogglez]

I never know what you're working on, Ph3nom.. saw the movie player. now this.. lol

[PH3NOM]

This is actually my final project for the semester for my CS course.

Written from scratch using Java, the main focus has been optimizing collision detection.

The collision objects are added to a sorted list, kept sorted from frame to frame.
This exploits Temporal Coherencehttp://en.wikipedia.org/wiki/Collision_ ... _coherence in the fact that most objects do not move a great deal from each frame to the next, so it is easy to keep a list sorted when adding or removing objects.
I use a Binary Search to effectively Sweep And Prune all objects that can not collide with the object in question, before applying an Axis Aligned Bounding Box collision algorithm.

[Neoblast]

any chance of a dreamcast port maybe?

[PH3NOM]

Perhaps...
The focus of my project was advanced sorting and searching algorithms, for which I received full credit.

As for DC, I have still been working on getting a decent video player up and running...

[PH3NOM]

Now getting back to Quake 3 BSP rendering on DC.

This map uses a lot of textures, so for a quick fix the textures resolution have been reduced by 1/2 to fit in available texture memory.
A better solution would be to compress into VQ instead of reducing resolution.

[MisterDave]

A couple of new videos of where I am with my engine rewrite:

[bogglez]

MisterDave, you should check out the World of Warcraft level file format. It provides simple tesselation but also keeps silhouettes consistent (your algorithm produces noticeable gaps).

[MisterDave]

Thanks for the link Bogglez. The gaps in my terrain are quite ugly when the tesselation changes coarseness and are really something that should be next on my development agenda. I've fixed the texture blending issue since I posted the last video, so hopefully the next one will look a lot better with both these fixes.

[bogglez]

Wrote a simple raytraced screensaver from scratch (no KOS). I used it for benchmarking purposes. It will calculate a new frame every once in a while, rotating about the scene.

You can try it in an emulator with this file:

raytrace.zip

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