Ray Tracing API Integration for OpenGL Applications

This repository is a Ray tracing API for OpenGL applications implemented in C++ & OpenCL. Please see below link if you are interested in our work.

Lai, WH, Tang, CY & Chang, CF 2017, Ray tracing API integration for OpenGL applications. in V Skala (ed.), Posters Proceedings. May edn, vol. 2703, University of West Bohemia, pp. 1-5, 25th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2017, Plzen, Czech Republic

Motivation

We provide a realtime ray tracing API (RTAPI) integration for OpenGL applications that can replace the original rendering pilepline (rasterization) with ray tracing by simply adding a few lines of code, and the algorithm behind in RTAPI is also fully parallelized by OpenCL.

`Original` OpenGL Applications	`RTAPI` OpenGL Applications
Conell box w/ light diabled	Ray tracing is applied automatically
Conell box w/ light enabled	Refraction material extension in RTAPI
	Mirror Reflection material extension in RTAPI

Supported Fixed Function Pipeline Calls

These calls are commonly used in fixed function pipeline, you can simply include the RayTracing.h and these calls are automatically transformed to RTAPI. Note that the extension column represents some features only provided by RTAPI which legacy OpenGL does not support.

Buffer	Rendering	Capability	GLU (OpenGL Utility Library)	Lighting	Extension
glGenBuffers	glVertexPointer	glEnableClientState	gluPerspective	glLightfv	rtMaterialEXT
glBindBuffer	glColorPointer	glDisableClientState	gluLookAt		rtBuildKDtreeCurrentSceneEXT
glBufferData	glNormalPointer	glEnable
	glDrawArrays	glDisable
	glFlush

Prerequisite

OpenCL >= 1.2 and its Installable Client Driver (ICD)
- Windows 10 PC
  - Using Intel iGPU, your Graphic driver is already included or you can update it from Intel Download Center.
  - Using NVIDIA GPU, please install the latest NVIDIA Graphic Driver.
- Linux PC (Ubuntu >= 16.04)
  - Using Intel iGPU, please install via this command sudo apt install intel-opencl-icd
  - Using NVIDIA GPU, please install via this command sudo apt install nvidia-opencl-icd
CMake >= 3.7
Git
GCC (Linux)
make (Linux)
Visual Studio 2015 Update 3 or greater with the English language pack (Windows)

Build from Scratch

Checkout the source tree:

> git clone --recursive https://github.com/RuinedStar/Ray-Tracing-API-Integration.git
> cd Ray-Tracing-API-Integration

Windows

Install 3rd-party libraries using vcpkg

> cd vcpkg
> .\bootstrap-vcpkg.bat
> .\vcpkg.exe install --triplet x64-windows opencl assimp freeglut glew glm

Generate your Visual Studio project

CMake-GUI or follow commands in Linux build section
Double click raytracing.sln to open Visual Studio IDE and start to play it around!

Linux

Install 3rd-party libraries using vcpkg

> cd vcpkg
> ./bootstrap-vcpkg.sh
> ./vcpkg install --triplet x64-linux opencl assimp freeglut glew glm

Configure and build your project

> cd ..
> mkdir build
> cd build
> cmake ..
> make -j$(nproc)

Special Thanks

My classmate, C.Y Tang

The College Advisor, C.F Chang