Add SDL, DearImGUI -- view mode prototype

.github/workflows/main.yml

@@ -32,17 +32,21 @@ jobs:
             install: |
               sudo apt-get update
               sudo apt-get install -y \
-                clang \
-                lld \
-                libc++-dev \
-                libc++abi-dev \
-                ninja-build
+                clang lld libc++-dev libc++abi-dev ninja-build \
+                gnome-desktop-testing libasound2-dev libpulse-dev \
+                libaudio-dev libfribidi-dev libjack-dev libsndio-dev libx11-dev libxext-dev \
+                libxrandr-dev libxcursor-dev libxfixes-dev libxi-dev libxss-dev libxtst-dev \
+                libxkbcommon-dev libdrm-dev libgbm-dev libgl1-mesa-dev libgles2-mesa-dev \
+                libegl1-mesa-dev libdbus-1-dev libibus-1.0-dev libudev-dev libthai-dev \
+                libpipewire-0.3-dev libwayland-dev libdecor-0-dev liburing-dev
             configure: |
               -G Ninja \
               -DCMAKE_C_COMPILER=clang \
               -DCMAKE_CXX_COMPILER=clang++ \
               -DCMAKE_LINKER=lld \
               -DCMAKE_CXX_FLAGS="-stdlib=libc++" \
+              -DSDL_STATIC=ON \
+              -DSDL_SHARED=OFF \
               -DCMAKE_EXE_LINKER_FLAGS="-Wl,--gc-sections"
 
           - name: MacOS Universal
@@ -57,7 +61,9 @@ jobs:
               -G Ninja \
               -DCMAKE_C_COMPILER=clang \
               -DCMAKE_CXX_COMPILER=clang++ \
-              -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64"
+              -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" \
+              -DSDL_STATIC=ON \
+              -DSDL_SHARED=OFF
 
           - name: Windows MinGW x86_64
             os: windows-latest
@@ -80,6 +86,8 @@ jobs:
               -DCMAKE_C_COMPILER=clang \
               -DCMAKE_CXX_COMPILER=clang++ \
               -DCMAKE_LINKER=lld \
+              -DSDL_STATIC=ON \
+              -DSDL_SHARED=OFF \
               -DCMAKE_EXE_LINKER_FLAGS="-static -Wl,--gc-sections" \
               -DCMAKE_SHARED_LINKER_FLAGS="-static"
 
@@ -94,6 +102,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0   # Required so we can move and push tags
+          submodules: recursive
 
       - name: Install dependencies
         run: ${{ matrix.config.install }}

.gitignore

@@ -100,3 +100,6 @@ build/
 .cache/
 *.bak
 *.wad
+
+library/SDL/*
+library/imgui/*

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "library/sdl"]
+	path = library/sdl
+	url = https://github.com/libsdl-org/SDL.git
+[submodule "library/imgui"]
+	path = library/imgui
+	url = https://github.com/ocornut/imgui.git

CMakeLists.txt

@@ -52,14 +52,42 @@ if(SAN_COUNT GREATER 0)
     endif()
 endif()
 
+# SDL3
+set(SDL_TEST OFF CACHE BOOL "" FORCE)
+set(SDL_INSTALL OFF CACHE BOOL "" FORCE)
+set(SDL_STATIC ON CACHE BOOL "" FORCE)
+set(SDL_SHARED OFF CACHE BOOL "" FORCE)
+add_subdirectory(library/sdl)
+
+# Dear ImGui
+add_library(imgui STATIC
+    library/imgui/imgui.cpp
+    library/imgui/imgui_demo.cpp
+    library/imgui/imgui_draw.cpp
+    library/imgui/imgui_tables.cpp
+    library/imgui/imgui_widgets.cpp
+    library/imgui/backends/imgui_impl_sdl3.cpp
+    library/imgui/backends/imgui_impl_sdlrenderer3.cpp
+)
+
+target_include_directories(imgui PUBLIC
+    library/imgui
+    library/imgui/backends
+)
+
+target_link_libraries(imgui PUBLIC SDL3::SDL3)
+
 add_executable(elfbsp
     src/bsp.cpp
+    src/core.hpp
     src/level.cpp
+    src/local.hpp
     src/main.cpp
     src/misc.cpp
     src/node.cpp
     src/parse.cpp
     src/polyobj.cpp
+    src/view.cpp
     src/wad.cpp
 )
 
@@ -85,6 +113,11 @@ target_compile_options(elfbsp PRIVATE
     $<$<COMPILE_LANGUAGE:CXX>:-Wold-style-cast>
 )
 
+target_link_libraries(elfbsp PRIVATE
+    SDL3::SDL3
+    imgui
+)
+
 if(ENABLE_WERROR)
     target_compile_options(elfbsp PRIVATE -Werror)
 endif()
@@ -125,18 +158,7 @@ set(CPACK_GENERATOR ZIP)
 if(WIN32)
     install(FILES LICENSE.txt DESTINATION .)
     install(FILES elfbsp.cfg DESTINATION .)
-    if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.21 AND NOT VCPKG_TOOLCHAIN)
-        install(
-            TARGETS elfbsp
-            RUNTIME_DEPENDENCIES
-                PRE_EXCLUDE_REGEXES "api-ms-" "ext-ms-"
-                POST_EXCLUDE_REGEXES ".*system32/.*\\.dll"
-                DIRECTORIES $<TARGET_FILE_DIR:elfbsp> $ENV{PATH}
-            RUNTIME DESTINATION .
-        )
-    else()
-        install(TARGETS elfbsp RUNTIME DESTINATION .)
-    endif()
+    install(TARGETS elfbsp RUNTIME DESTINATION .)
 else()
     include(GNUInstallDirs)
     install(FILES LICENSE.txt DESTINATION "share/doc/${PROJECT_NAME}")