OpenGL 3D tutorial

Game engine

Based on the youtube video tutorials

https://www.youtube.com/watch?v=VS8wlS9hF8E&list=PLRIWtICgwaX0u7Rf9zkZhLoLuZVfUksDP

and inspired by the game engine written by Joel

https://github.com/neutrinog/prism

Contents

• lesson 01 display
• lesson 02 VAO's and VBO's
• lesson 03 rendering with index buffers
• lesson 04 introduction to shaders
• lesson 05 coloring using shaders
• lesson 06 texturing
• lesson 07 matrices and uniform variables
• lesson 08 model, view and projection matrix
• lesson 09 OBJ file format
• lesson 10 loading 3D models
• lesson 11 per pixel lighting
• lesson 12 specular lighting, optimize render process (part 1)
• lesson 13 optimize render process (part 2)
• lesson 14 simple terrain
• lesson 15 transparency and fake lighting
• lesson 16 fog
• lesson 17 multi texturing
• lesson 18 player movement
• lesson 19 third person camera
• lesson 20 mipmapping
• lesson 21 terrain height maps
• lesson 22 terrain collision detection
• lesson 23 texture atlases
• lesson 24 rendering GUIs
• lesson 25 multiple lights
• lesson 26 point lights
• lesson 27 skybox
• lesson 28 day/night
• lesson 29 mouse picking

To run the code for a lesson, go to corresponding directory. Make sure the script build.sh is executable and then execute the following commands from your terminal

$ shards install --ignore-crystal-version
$ ./build.sh
$ ./a.out

The build.sh script will compile and link a lesson and produces the executable a.out

Ray marching

Based on the youtube video tutorials The Art of Code

https://www.youtube.com/playlist?list=PLGmrMu-IwbgtMxMiV3x4IrHPlPmg7FD-P

Contents

• lesson 01, basic ray marching algorithm
• lesson 02, basic shapes, dynamic recompiling of shaders
• lesson 03, basic operators
• lesson 04, boolean operators (union, subtract, intersect) with smooth minimum
• lesson 05, added a simple preprocessor to include shader files