NDK_Engine

Synopsis

This project is a simple, android mobile-oriented, 3D OpenGL ES 2.0 based game engine developed inside of the Android Native Development kit, written primarily in C++

This engine was written specifically for a game

• This is why no general 3D physics engine is included, and why other common game engine features are missing (i.e. a particle system, lighting/shadow rendering)

Graphical Features

• Skeletal 3D Animations
• Parenting objects to skeletal animation bones
• (i.e. parenting the camera to a head bone for first person animations)
• Custom GLSL shader/material support
• Skybox rendering support

Sound Features

• Supports 3D stereo R/L volume panning
• (i.e. sounds playing from a source nearby on the camera's left hand side will be played through the left speaker)
• Supports 3D audio falloff
• (i.e. sounds playing further away are quieter than nearby sounds)

Mobile Specific Features

• Includes JNI (Java Native Interface) support
• This allows you to create Java code snippets and execute them from within the C++ game code
• Meant for implementing in-app purchases
• Mobile banner ad support
• Achieved through JNI, this allows a banner ad to be overlayed on top of the opengl game view
• Banner ad can be made visible / hidden from within the engine C++ code

Technical Details

• Utilizes OpenGL ES 2

• Utilizes OpenSL for sound engine

• Custom Skeletal animation format (*.skaf)

• Custom Skeleton structure format (*.sksf)

• Custom Skeletal Model Format (*.skmf)

• Allows each vertex to have:

• up to 3 bone weight influences

• 1 set of UV coordinates

• vertex normals, tangents, and binormals

• Custom Static Model Format (*.stmf)

• Allows each vertex to have:

• 2 sets of UV coordinates

• One meant for a diffuse texture, the other meant for a lightmap texture atlas

• vertex normals, tangents, and binormals

• Utilizes ETC1 Compressed texture format (*.pkm)

• This allows me to simply pass along the image data directly to the GPU without the need for modification

• The tradeoff is that this format only supports RGB channels, and has some (slight) compression artifacts

• Utilizes raw headerless Sound format (*.raw)

• 16-bit depth stereo files, at 44100 Hz