Paradigm Engine

Paradigm Engine is a Vulkan first modern graphics rendering library written in C++23 (mostly c++17/20) with support for GLES (3.2), and future WebGPU support (see status section for more info). It concerns itself mostly with the heavy lifting of the rendering part of the engine, and supporting a toolchain that is flexible to your project's needs and structure. It stays away from dictating your code design, forcing you to use inheritence or the like for your logic, stays away from macro usage (unless in very rare instances), avoids globals, and provides simple bindings for you to implement your language of choice.

Some of the key reasons why this engine exists:

• Showcasing an approach to serialization in C++ that does not rely on external compilers or macro magic.
• Building a renderer that is fully integrated with a multithreaded ECS.
• A focus on small binary size, for ease of distribution in a team.
• Trying out new rendering engine designs that are more suited, and enabled by, modern graphics API's.
• Flexible testbed for those who want to quickly prototype/validate something.
• A trivial binding point so you can insert the language of your choice for your logic/extensions.
• Minimize globals and service locator patterns that are present in many engines out there and instead use dependency injection.
• _{^{And ofcourse brush up my skills in writing systems and architectures I'm not familiar with, and give myself new challenges in other problem domains. :D}}

For more detailed description about the engine itself, go to the readme of the core project, which is in the folder of the same name. Similarly all sub-projects that make up the engine all have their own readme's describing their intent, structure, status and dependencies. This readme is just to give a larger oversight over the entire project.

Status

Architecture	Status	Vulkan	GLeS	Metal	WebGPU
		1.2	3.1 - 3.2	-
		1.2	3.1 - 3.2	-
		1.2	3.2*	-
		-	-	-
		-	-	-
		1.2	3.1 - 3.2	-
		1.2	3.1 - 3.2	-
	see notes**	-	-	-	in progress

* GLES on GNU/Linux requires libegl1-mesa-dev and libgles2-mesa-dev to be installed.

** WASM/WebGPU currently in progress, the psl library compiles, but the WebGPU HAL still needs to be written in core.

Building

Prerequisites

All platforms

Python 3.9 or newer

CMake 3.22 or higher is required on all platforms.

A C++23 compliant compiler. See the Github Actions for up-to-date examples of supported compilers on different platforms.

Android

Android SDK Gradle (7.6 or later)

Creating the project files

You can build this project by either using the provided CMakePresets.json file (recommended), or by running paradigm.py with python 3.9+. See the CMakePresets section for more information.

So far MSVC (2022), CLang (12.0.0) with libc++, and GCC (12.1.0) are supported. The project will likely incorrectly generate for other compilers/setups. You can always verify the compiler version that was used by checking the github CI runners.

If lost, check the github actions workflow folder to see ideal platform setups.

CMakePresets

Various CMakePresets exists, they are specified to working combinations of graphics API's that are supported for the given platform. They can be used as normal, or used as guides for custom setups.

The cmake presets are structured in the following way {platform}-{type}-{graphics} unless the platform also supports different architectures (such as x86 and x86_64) in which case they are {platform}-{pointer_size}-{type}-{graphics}, see next section for more information. Following are the valid settings for each.

platform:

• windows
• gnu-linux
• android

type:

• debug
• release

graphics:

• vulkan
• all (imples both vulkan and gles support).

paradigm.py

The paradigm script is a helper script that can invoke, amongst others, the builder script (tools/build.py). Invoke the builder script using --run build, this will set everything up quick and easy. It will generate a solution in the /project_file/{generator}/{architecture}/ folder by default, and when building it will output to /builds/{generator}/{architecture}/. You can tweak various settings and values, you'll find them at the top of the tools/build.py file.

As an example running py paradigm.py --run build --graphics vulkan gles --generator Ninja will set up the project as an executable, with all available graphics backends, using the Ninja build tool.

Examples

Examples can be built when toggling on the PE_EXAMPLES cmake option. You can inspect the examples at ./examples/. By default all examples are built as a sub-folder in the output directory.

The examples directory additionally contains a readme that describes the examples in more detail.

Project Structure

Sub-Projects

All the sub-project's code resides in the root in a folder that shares the same name. Each one of them contains both the src and inc folder as well as a readme that describes that specific project's intended goals.

Tools

For tools that can aid in generating shaders, importing models, and generating resource libraries, check out the assembler repository.

Versioning

Version information can be found in core/gen/core/paradigm.hpp (note this file is generated by tools/generate_header_info.py which auto runs every build). This project uses versioning of the format MAJOR.MINOR.PATCH.{GIT SHA1}. Release type can be one of the following:

• i - internal
• r - release

release versions are determined if the SHA1 is pointing to a tagged commit, otherwise it's considered an internal build.

External Libraries

The following external libraries may be used in one, or many of the sub projects. The specific project readme's will describe their dependencies in more detail so you can always verify which project uses what.

• GLI image loading and saving
• GLM mathematics library used only by GLI
• litmus used for running tests
• spdlog used for logging
• fmt modern formatting library for C++
• utfcpp utf8 string parsing
• strype support for stringifying typenames and enums on supported compilers

note that dependencies might pull in further dependencies that are not listed here.

Conditional dependencies

The following dependencies are conditionally included:

• Vulkan-hpp when enabling the Vulkan backend Vulkan-hpp is used to generated C++ like headers for Vulkan
• GLAD when enabling the GL backend GLAD is used to generate the GL headers
• google/benchmark when enabling PE_BENCHMARKS

Documentation

A reference documentation is available at https://paradigmengine.github.io/. API examples, tutorials, and best practices guide will be written at a later time. For the time being, you can look at the example projects provided in the examples section.

You can also find further documentation in the docs directory, such as information on how to use the Entity Component System.

Tests

building

Tests are on by default when compiling the project as a library, you can disable this by toggline PE_MODE in cmake from LIB to LIB_NO_TESTS. Tests will not be included when building the project in EXE mode.

When using CMake directly (or with CMakePresets), you'll have the project files output in project_files, from there out you can either boot it up in your editor of choice, or if your generator isn't also an IDE, then build it from there. Build outputs by default will appear in /builds/.

When using the paradigm.py or tools/build.py script, you can set this value like this --cmake_params="-DPE_MODE=LIB". LIB is the default value for this project.

Tests use Google Benchmark, these will be fetched automatically when the CMake script detects testing to be true.

Future

Language

This project will keep up with the latest C++ language improvements till atleast C++2a, as we require some of the newer features to create safer and easier to reason about interfaces for, amongst other things, serialization. After C++2a we will freeze the language to that version and keep it stable.

Graphics Backends

After fully completing support for GLES 3.1+ and Vulkan, and a graphical toolset for editing has been finished, focus will be shifted on a Metal backend. A WebGPU backend might be looked into to support more platforms as well if it has reached MVP/1.0 status.

Extras

Build as executable

If you wish to build the engine, not as a library, but instead as an executable, you can enable this behaviour by passing -DPE_MODE=EXE as a --cmake_param in the build.py script, or directly in your cmake invocation. This will set the CORE_EXECUTABLE define in the compiler, and will trigger the core project to be built as an executable instead of being a library.

Benchmarks

Rudimentary benchmarks (heavily WIP) have been added to the project, you can enable this by setting the cmake value PE_MODE to anything but EXE, and toggling on PE_BENCHMARKS.

License

This project is dual-licensed under commercial and open source licenses. Licensed under GNU AGPLv3 for free usage, and licensed under a commercial license you can purchase or request for commercial usage.

• GNU AGPLv3: You may use Paradigm Engine as a Free Open Source Software as outlined in the terms found here: https://www.gnu.org/licenses/agpl-3.0.en.html

• Commercial license: If you do not want to disclose the source of your application you have the option to request a commercial license. The commercial license gives you the full rights to create and distribute software on your own terms without any open source license obligations. For more information, please contact Jessy De Lannoit directly here.

This license (and its setup) only applies to the current major version of this software. So if you are getting the license on version 1.0.0, you will be able to use all upgrades that carry the same major version number (in this case 1.x.x). Once the switch is made to a newer version such as 2.x.x of the project, you will need to upgrade your license to use that major version's updated license (in case there is a new license), or the updated license setup.

Of course you may continue to use any version of this project you currently have licensed/have a license for, without needing to change your license as long as you do not pull new updates from major versions you do not have a license for.

This license, and its setup applies to all sub-projects in this repository unless explicitly stated otherwise.