Edit Infobox GBA Homebrews: Yeti3D GBA

You do not have permission to edit this page, for the following reason:

The action you have requested is limited to users in one of the groups: Users, Administrators.

Title:
Image:	Upload file
Description:
Author(s):
Last Updated:
Contributor(s):
Ported by:
Type:
Version:
License:
Language(s):
Format:
Download:
Download Raw:
Website:
Source:
Discussion:
Donation:

Free text:

{{#seo: |title= (Game engine) - GameBrew |title_mode=append |image=yeti3dgba02.png |image_alt=Yeti3D }} This is the second public release of the [https://sourceforge.net/projects/yeti3dpro/ Yeti 3D Engine]. The Yeti engine is a fully featured 3d engine designed for low cost portable devices, namely the GameBoy Advanced, mobile phones and Palm units. It should therefore run on just about anything. ==User guide== These are design notes for the Yeti engine. Other engines use very different algorithms. * The current viewport is 120x80 pixels, 15bit. * All textures are 64x64 8bit. * Textures are converted to 15bit via a pre-calculated lighting LUT. * Polygons can be any convex shape. Only squares are currently used. * Each vertex is described as X, Y, Z, U, V and brightness. * The renderer uses 24:8 fixed point maths. * Polygons are clipped in 3D space using 45 degree planes. Distance to plane calculations therefore use only additions and subtractions. * Polygon edges are clipped using one divide and 6 multiplies. * 4 clipping planes are used. No front plane is required. No back plane is used. * No per-span clipping is used. Fixed point errors are hidden offscreen. * Ray-casting is used to build a visablity list and valid polygon rendering order. * Models are merged into the VIS without sorting. * No Z-buffers are used. Rendering is back-to-front (painters algorithm). * The is an acceptable level of overdraw. Complete polygons are culled. Polygon edges are drawn faster than using a per span clipper. * Lighting is pre-calculated on startup. Lighting can be moved at runtime. * Lighting is expanded per vertex and interpolated along polygon edges. * A reciprocal table is used to eliminate all divides from the DDA texture mapper. * The affine texture loop is unrolled and renders blocks of 32 pixels. ==Media== '''Yeti 3D GBA Engine Tech DEMO''' ([https://www.youtube.com/watch?v=t5_cnZabhig Jaroslav Dolejší]) <br> <youtube>t5_cnZabhig</youtube> ==External links== * Author's website - [https://web.archive.org/web/20050403113342/http://theteahouse.com.au/gba/ http://theteahouse.com.au/gba/] (archived)

Summary:

Cancel