glcube

glcube is OpenGL cube demo in C11 using programmable shaders. The demo uses the linmath.h and gl2_util.h headers which contain a simple vertex and index buffer abstraction, functions for loading and compiling shaders plus basic mouse navigation.

Introduction

glcube is an app skeleton using gl2_util.h, a nano framework for creating apps using the modern OpenGL and GLSL shader pipeline. The CMakeLists.txt is intended to be used as a template for tiny demos.

The shader uses a noise function derived from SHA-2, combined with UVs to create deterministic surface noise.

Project Structure

• src/gl2_cube.c - OpenGL 2.1 cube using the gl2_util.h shader loader.
• src/gl3_cube.c - OpenGL 3.2 cube using the gl2_util.h shader loader.
• src/gl4_cube.c - OpenGL 4.5 cube using the gl2_util.h shader loader.
• src/gl2_util.h - header functions for OpenGL buffers and shaders.
• src/linmath.h - public domain linear algebra header functions.

Build Instructions

sudo apt-get install -y cmake ninja-build
cmake -G Ninja -B build .
cmake --build build

Examples

The project includes several versions of glcube ported to multiple APIs.

gl2_cube

gl2_cube is a 3D cube renderer using OpenGL 2.x and GLSL shaders.

gl3_cube

gl3_cube is mostly the same as gl2_cube with the addition of vertex array objects which were added in OpenGL 3.x.

gl4_cube

gl4_cube is mostly the same as gl3_cube with the addition of uniform buffer objects which were added in OpenGL 4.x.