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fresa: a tiny (unfinished) vulkan game engine 🍓

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# fresa :strawberry:

A tiny game engine made in C++20.

_This repository holds the legacy working version of **fresa**. **fresa** was being redesigned from scratch in a '[new](https://github.com/eerii/fresa/tree/experimental)' branch. I was reimplementing the entire API, this time with a focus on clarity and documentation. However, I no longer had the time to work on this project and I have moved on to other ways of making graphics. Still, this had taught me so much and is so special to me, and there are some things I'm really proud of hidden here._

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**Check the project template [here](https://github.com/eerii/mermelada)**

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## features :sparkles:

**Graphics** 
- Custom renderer with Vulkan, OpenGL and WebGL support
- Instanced rendering
- Multiple shader subpasses
- Automatic GLSL shader compilation for each API and reflection using SPIRV-Cross
- High level API that allows complete customization of the cross platform renderer
- Compute shaders and Indirect drawing (Vulkan only)

**ECS**
- Data oriented Entity Component System
- Scene management
- Custom component controllers for specialized behaviour
- Entity editor GUI

**Reflection**
- C++ compile time type reflection implementation
- Loop through each member of a struct and apply callables
- Automatic serialization (save/load)

**Other**
- Custom compile time state machine implementation
- Input handling
- Logging and debugging tools
- Collision checking
- Time managment and timers
- Event handling

## building :hammer:

Right now the project is in the **very pre-alpha** state, so use it at your own risk.

**Template:** [mermelada](https://github.com/eerii/mermelada)

You can check the template on how one could set up a **fresa** project. Detailed instructions on how to build it are there.

**Dependencies**
- SDL2 (cross-platform window and input)
- Vulkan/OpenGL (renderer of choice)
- _SPIR-V Cross_ (shader reflection and compilation)
- _VulkanMemoryAllocator_ (only Vulkan renderer, memory management)
- _imGUI_ (for a debug graphical interface)
- _stb_image_ (loading images)
- _glm_ (glsl linear algebra)

_Included as submodules. Only SDL2 and VK/GL are needed._

**Options**
- `USE_VULKAN` or `USE_OPENGL`: Enables the desired renderer
- `LOG_LEVEL = 1...5`: Selects log verbosity, 1 being only errors and 5 debug
- `DISABLE_GUI`: Disables the compilation of imGUI and all the GUI code
- `PROJECT_DIR`: For debugging editor tools, the root of your project

## code example :books:

**main.cpp**

```cpp
#include "game.h"
#include "scene.h"

using namespace Fresa;

int main(int argc, const char * argv[]) {
    //: Initialize game
    bool running = Game::init();
    
    //: Load scene
    SceneID scene = registerScene();
    active_scene = scene;
    
    //: Update loop
    while (running) {
        running = Game::update();
    }
    
    //: Cleanup
    Game::stop();
    
    return EXIT_SUCCESS;
}
```

**other files**

To access the ECS capabilities, a `component_list.h` file may be created that `#includes` all the component headers you create, as well as a variant for the component type. Follow the instructions on [`ecs.h`](https://github.com/eerii/fresa/blob/main/ecs/ecs.h) or the example in [mermelada](https://github.com/eerii/aguacate) to create one.

You can also create a `vertex_list.h` to add new vertex type definitions to use with glsl.

## license :pencil:

This project is licensed under [GNU GPLv3](https://github.com/eerii/fresa/blob/main/LICENSE.md).

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