OpenGL 2.1 Demopack for GeeXLab




GeeXLab OpenGL 2.1 demopack



The 7-year old full samples pack, that includes OpenGL 2, 3, 4 and Vulkan demos, is become a real mess, many demos simply no longer work. So it’s time to tidy up this pack. I decided to split demos in several smaller packs according to the 3D API: a pack for OpenGL 2.1 demos, a pack for OpenGL 3.2 demos, a pack for Vulkan demos, etc.

All demos in the OpenGL 2.1 demopack have been tested with latest GeeXLab 0.29.1. They should run on any OpenGL 2.1 capable system:

  • Windows
  • Linux
  • macOS
  • Raspberry Pi

 
Most of the demos are coded in Lua and each demo is split in several source codes:

  • main.xml: the demo entry point. Just drag and drop this file into GeeXLab to run the demo.
  • init.lua: referenced by main.xml. The demo INIT script.
  • frame.lua: referenced by main.xml. The demo FRAME script.

Some demos have also other files like size.lua, terminate.lua or dnd.lua.

 
This new organization makes the discovering and tweaking of a demo simpler. Moreover, the live coding can be easily enabled or disabled. If you want to live-code a demo, just search for the livecoding XML attribute in the main.xml file (in the FRAME script XML node). To enable or disable live coding, just set livecoding to 1 or 0:

<script name="update_scene" run_mode="FRAME" 
           filename="frame.lua" livecoding="1" />

 
With live coding, you can run a demo and edit the FRAME script at the same time in your favorite text editor. In my case, I use VSCodium on Windows, macOS and Linux and Geany on Raspberry Pi and TinkerBoard.


GeeXLab live coding a demo

 
This first version of the GL 2.1 demopack includes 41 demos:

d01-triangle
d02-libfont
d03-bouncing-boxes-2d
d04-audio-fmod
d05-magickview
d06-3d-template
d07-meshes
d08-color-blending
d09-vertexpool
d10-reflection
d11-gears
d12-flow-fields
d13-drawing-letters-with-mouse
d14-countdown
d15-checkerboard
d16-electrical-arc
d17-fire-shader
d18-hashcodes
d19-loops
d20-lua-filesystem
d21-lua-python-shared-variables
d22-multiple-viewports
d23-rotation-with-quaternion
d24-line
d25-input
d26-bullet3-physics
d27-two-sided-lighthing
d28-texture
d29-imgui
d30-video-player-ffmpeg
d31-webcam
d32-hello-framework
d33-fisheye-shader
d34-surface-plots
d35-shaderlib-normal-mapping
d36-slide-show
d37-sqlite3
d38-cell-shading
d39-2d-wave
d40-2d-grid-shader
d41-imgui-lot-of-windows-gl-vs-vk

 
Here are some screenshots:

 
d09-vertexpool:
GeeXLab OpenGL 2.1 demopack - vertexpool

 
d05-magickview:
GeeXLab OpenGL 2.1 demopack - ImageMagick

 
d07-meshes:
GeeXLab OpenGL 2.1 demopack - built-in meshes

 
d33-fisheye-shader:
GeeXLab OpenGL 2.1 demopack - Fish Eye shader

 
d38-cell-shading:
GeeXLab OpenGL 2.1 demopack - Toon shader

 
d10-reflection:
GeeXLab OpenGL 2.1 demopack - reflections

 
d03-bouncing-boxes-2d:
GeeXLab OpenGL 2.1 demopack - bouncing boxes

 
d26-bullet3-physics:
GeeXLab OpenGL 2.1 demopack - Bullet3 Physics

 
d11-gears:
GeeXLab OpenGL 2.1 demopack - gears





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