223 lines
9.5 KiB
Markdown
223 lines
9.5 KiB
Markdown
# Qtk
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[](https://github.com/shaunrd0/qtk/actions/workflows/all-builds.yml)
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[](https://github.com/shaunrd0/qtk/actions/workflows/linting.yml)
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Qtk is a Qt OpenGL graphics library created primarily for my own learning
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purposes. The library wraps some QOpenGL functionality in convenience classes
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that allow rendering geometry in 2D and 3D using custom GLSL shader programs.
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The long-term goal for this project is to create a tool that I can use to
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practice shader coding or graphics programming techniques. In doing this I hope
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to also learn more about the Qt UI framework, and the CMake build system.
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Key features that are planned:
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* Runtime loading of `.obj` or similar 3D models.
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* Drag-and-drop interaction for adding objects to the scene.
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* Runtime reloading of modified GLSL shaders attached to objects within scenes.
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* Multiple views of a scene at one time.
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* Camera control modes such as panning, orbiting, or following objects.
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* Save / load for scene data. The current inheritance model is temporary.
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* Basic text editor for quickly modifying shaders attached to objects.
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* Shader / object properties panel to modify related settings.
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The Qtk desktop application provides a model loader using [Assimp](https://assimp.org/) within a Qt widget application.
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For examples of using the Qtk API, see the `example-app` project in the root of
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this repository.
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To get textures loading on models look into [material files](http://www.paulbourke.net/dataformats/mtl/)
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and see some examples in the `resources/models/` directory.
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### Source Builds
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Qtk was developed and tested using CLion and [Qt Creator](https://github.com/qt-creator/qt-creator).
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Simply open the root `CMakeLists.txt` with either of these editors and configurations will be loaded.
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This project has been ported to Qt6, which is not yet available in Ubuntu apt repositories.
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To run this project, you will *need* to install [Qt6 Open Source Binaries](https://www.qt.io/download-qt-installer) for your system.
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Be sure to take note of the Qt6 installation directory, as we will need it to correctly set our `CMAKE_PREFIX_PATH` in the next steps.
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#### Linux
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Once Qt6 is installed, to build and run `qtk` on Ubuntu -
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```bash
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sudo apt update -y && sudo apt install libassimp-dev cmake build-essential git
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git clone https://github.com/shaunrd0/qtk
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cmake -DCMAKE_PREFIX_PATH=$HOME/Qt/6.3.1/gcc_64 -S qtk/ -B qtk/build/ && cmake --build qtk/build/ -j $(nproc --ignore=2) --target qtk-main
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./qtk/build/qtk-main
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```
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By default, the build will not initialize Assimp as a git submodule and build from source.
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We can turn this on by setting the `-DQTK_UPDATE_SUBMODULES=ON` flag when running CMake.
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Building using this option will fetch and build Assimp for us, but builds will take longer as a result.
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Using `-DQTK_UPDATE_SUBMODULES=ON` supports providing assimp on cross-platform builds (Windows / Mac / Linux) and may be easier to configure.
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```bash
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sudo apt update -y && sudo apt install freeglut3-dev libassimp-dev cmake build-essential git
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git clone https://gitlab.com/shaunrd0/qtk
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cmake -DQTK_UPDATE_SUBMODULES=ON -DCMAKE_PREFIX_PATH=$HOME/Qt/6.3.1/gcc_64 -S qtk/ -B qtk/build/ && cmake --build qtk/build/ -j $(nproc --ignore=2) --target qtk-main
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./qtk/build/qtk-main
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```
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If any errors are encountered loading plugins, we can debug plugin loading by setting the following environment variable -
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```bash
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QT_DEBUG_PLUGINS=1 ./qtk-main
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```
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#### Windows / MacOS
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If you are building on **Windows / Mac** and bringing your own installation of Assimp, consider setting the `-DASSIMP_NEW_INTERFACE` build flag.
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```bash
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cmake -S qtk/ -B qtk/build/ -DASSIMP_NEW_INTERFACE=ON -DCMAKE_PREFIX_PATH=$HOME/Qt/6.3.1/gcc_64;/path/to/assimp/ && cmake --build qtk/build/ -j $(nproc --ignore=2) --target qtk-main
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```
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### Qtk Plugin Collection
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This project defines a collection of widget plugins for use with Qt Designer.
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These plugins were used to build the interface for the Qtk desktop application.
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Qt Designer will list Qtk widgets in the side panel when editing a UI file within the designer.
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Qtk widgets will also render and behave correctly within the UI preview in designer.
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The widgets in the Qtk collection were created by implementing the [QDesignerCustomWidgetInterface](https://doc.qt.io/qt-6/qdesignercustomwidgetinterface.html#details) and [QDesignerCustomWidgetCollectionInterface](https://doc.qt.io/qt-6/qdesignercustomwidgetcollectioninterface.html) interfaces.
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To build and install the Qtk plugin collection -
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```bash
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cmake -S /path/to/qtk -B /path/to/qtk/build -DCMAKE_PREFIX_PATH=$HOME/Qt/6.3.1/gcc_64
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cmake --build /path/to/qtk/build --target qtk-collection
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cmake --install /path/to/qtk/build
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```
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To uninstall after a previous installation, we can run the following command from the root of the repository.
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```bash
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xargs rm < build/install_manifest.txt
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```
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### Controls
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You can fly around the scene if you hold the right mouse button and use WASD.
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If you see a small triangle floating by a model it represents the light source
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that is being used for the shader rendering the model. These appear on models
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using phong, specular, and diffuse lighting techniques.
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Spartan with no normals -
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Spartan with normals -
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#### Development
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This project uses version `15.0.5` of `clang-format`.
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Before merging any branch we should run `clang-tidy` followed by `clang-format`.
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```bash
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git clone git@github.com:llvm/llvm-project.git -b llvmorg-15.0.5
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cd llvm-project
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cmake -B build -DLLVM_ENABLE_PROJECTS=clang -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" -DCMAKE_BUILD_TYPE=Release -G "Unix Makefiles" llvm
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cmake --build build -j $(nproc --ignore=2)
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sudo cmake --build build -j $(nproc --ignore=2) --target install
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```
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If the `clang-format` version is any earlier than `15.0.0`, running `clang-format` will fail because this project uses configuration options made available since `15.0.0`.
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```bash
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clang-format --version
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clang-format version 15.0.5 (git@github.com:llvm/llvm-project.git 154e88af7ec97d9b9f389e55d45bf07108a9a097)
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```
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CLion has integration for IDE code reformatting actions with `clang-format`.
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If you're using CLion, the `.clang-format` configuration will be picked up by CLion automatically.
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`clang-tidy` can be run with the following commands.
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```bash
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# Move to the root of the repo
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cd qtk
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# Build
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cmake -B build && cmake --build build
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clang-tidy -p build/ --fix --config-file=.clang-tidy src/*.cpp src/*.h app/*.cpp app/*.h
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```
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Last we need to run `clang-format`, this can be done with the command directly.
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This will reformat all the code in the repository.
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```bash
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clang-format -i --style=file:.clang-format src/*.cpp src/*.h app/*.cpp app/*.h
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```
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`clang-format` can be run with git integration (or CLion if you prefer).
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Git will only reformat the lines you modified, which can be useful.
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```bash
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# If we want to format the last N commits
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# git clang-format HEAD~N
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# 3 commits
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git clang-format HEAD~3
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changed files:
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app/examplescene.h
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app/mainwindow.h
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src/abstractscene.cpp
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src/skybox.h
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src/texture.cpp
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src/texture.h
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src/transform3D.h
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```
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##### Packaging
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Packaging for Qtk is in early development.
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This section documents how to package Qtk, but only source builds have been verified on Windows / Mac / Linux.
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For this reason, it is recommended to install Qtk by strictly building from source at this time.
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Below are the steps to package a Qtk release.
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```bash
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cd /path/to/qtk && cmake -B build
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# Package Qtk
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cmake --build build --target package
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# Package Qtk including source files
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cmake --build build --target package_source
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```
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Alternatively, we can use `cpack` directly -
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```bash
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cd /path/to/qtk && cmake -B build
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# Generate all install packages
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cpack -C Release
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# Generate a specific install package (ZIP)
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cpack -C Release -G ZIP
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# Generate a specific install package (DEB)
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cpack -C Release -G DEB
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```
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##### Resources
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Some useful links and resources that I have found while working on this project.
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[Qt Designer UI file format](https://doc.qt.io/qt-6/designer-ui-file-format.html)
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[QtPlugin Import / Export plugins](https://doc.qt.io/qt-6/qtplugin.html)
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## Model Artists
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"Alien Hominid" (https://skfb.ly/onStx) by Nwilly_art is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).
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"Scythe World Of Warcraft" (https://skfb.ly/6UooG) by Warcraft-3D-Models is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).
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"Spartan Armour MKV - Halo Reach" (https://skfb.ly/6QVvM) by McCarthy3D is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).
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"Survival Guitar Backpack (Low Poly)" (https://skfb.ly/6RnCB) by Berk Gedik is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).
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Model by Berk Gedik, from: https://sketchfab.com/3d-models/survival-guitar-backpack-low-poly-799f8c4511f84fab8c3f12887f7e6b36
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Modified (learnopengl.com) material assignment (Joey de Vries) for easier load in OpenGL model loading chapter, and renamed albedo to diffuse and metallic to specular to match non-PBR lighting setup.
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"Terror-bird (NHMW-Geo 2012/0007/0001)" (https://skfb.ly/onAWy) by Natural History Museum Vienna is licensed under Creative Commons Attribution-NonCommercial (http://creativecommons.org/licenses/by-nc/4.0/).
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"Golden Lion Sitting OBJ Low Poly FREE" (https://skfb.ly/onZAH) by LordSamueliSolo is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).
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