opengl image based lighting demo

Model comes from

66432 triangle, FPS is in yellow

Pipeline:

For diffuse effects. Sample the original cubemap color (hdr) at the center of this probe as radiance to approximate the irradiance from every direction (subject to sampling resoluting) using Riemann sum. Then calculate the diffuse contributions.
For specular effects. Create mipmap based on roughness (using Normal Distribution Function D, so here the whole Rendering equation contains D) for radiance (prefilter). Pre calculate BRDF as texture to look up by NdotV and roughness.
using these textures as approx. to solve for rendering eqn (specular term), and then add with (1) for global illumination.

Run on Windows 11, Intel Core i7 12700h, Nvidia RTX 3060 laptop

Name		Name	Last commit message	Last commit date
Latest commit History 9 Commits
images		images
objects/knight		objects/knight
shaders/ibl		shaders/ibl
Camera.hpp		Camera.hpp
Mesh.hpp		Mesh.hpp
Model.hpp		Model.hpp
README.md		README.md
Shader.hpp		Shader.hpp
additional.cpp		additional.cpp
glad.c		glad.c
knight_micro.cpp		knight_micro.cpp
version.h		version.h