Initial Commit

Basic window with OpenGL, glad, GLFW, ImGui, and Eigen.
Dependencies are populated with FetchContent, not submodules.

External/eigen.cmake

@@ -0,0 +1,9 @@
+FetchContent_Declare(
+    eigen
+    GIT_REPOSITORY https://gitlab.com/libeigen/eigen.git
+    GIT_TAG 3.4
+)
+set(EIGEN_BUILD_DOC OFF CACHE INTERNAL "")
+set(BUILD_TESTING OFF CACHE INTERNAL "")
+set(EIGEN_BUILD_PKGCONFIG OFF CACHE INTERNAL "")
+FetchContent_MakeAvailable(eigen)

External/glad.cmake

@@ -0,0 +1,9 @@
+FetchContent_Declare(
+    glad
+    GIT_REPOSITORY https://github.com/Dav1dde/glad.git
+    GIT_TAG v0.1.36
+)
+set(GLAD_PROFILE "core" CACHE INTERNAL "OpenGL profile")
+set(GLAD_API "gl=4.6" CACHE INTERNAL "API type/version pairs, like \"gl=3.2,gles=\", no version means latest")
+set(GLAD_GENERATOR "c" CACHE INTERNAL "Language to generate the binding for")
+FetchContent_MakeAvailable(glad)

External/glfw.cmake

@@ -0,0 +1,10 @@
+FetchContent_Declare(
+    glfw
+    GIT_REPOSITORY https://github.com/glfw/glfw.git
+    GIT_TAG 3.3.6
+)
+set(GLFW_BUILD_EXAMPLES OFF CACHE INTERNAL "")
+set(GLFW_BUILD_TESTS OFF CACHE INTERNAL "")
+set(GLFW_BUILD_DOCS OFF CACHE INTERNAL "")
+set(GLFW_INSTALL OFF CACHE INTERNAL "")
+FetchContent_MakeAvailable(glfw)

External/imgui.cmake

@@ -0,0 +1,22 @@
+FetchContent_Declare(
+    imgui
+    GIT_REPOSITORY https://github.com/ocornut/imgui
+    GIT_TAG v1.86
+)
+FetchContent_MakeAvailable(imgui)
+
+add_library(
+    imgui
+    ${imgui_SOURCE_DIR}/backends/imgui_impl_glfw.cpp
+    ${imgui_SOURCE_DIR}/backends/imgui_impl_glfw.h
+    ${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp
+    ${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.h
+    ${imgui_SOURCE_DIR}/imgui.cpp
+    ${imgui_SOURCE_DIR}/imgui.h
+    ${imgui_SOURCE_DIR}/imgui_demo.cpp
+    ${imgui_SOURCE_DIR}/imgui_draw.cpp
+    ${imgui_SOURCE_DIR}/imgui_tables.cpp
+    ${imgui_SOURCE_DIR}/imgui_widgets.cpp
+)
+target_include_directories(imgui PUBLIC ${imgui_SOURCE_DIR})
+target_link_libraries(imgui PRIVATE glfw)