Use Magnum's builtin text rendering instead of ImGui; expose it in Python

.gitmodules

@@ -34,9 +34,6 @@
 [submodule "docs/m.css"]
 	path = docs/m.css
 	url = https://github.com/mosra/m.css
-[submodule "src/deps/imgui"]
-	path = src/deps/imgui
-	url = https://github.com/ocornut/imgui.git
 [submodule "src/deps/tinyobjloader"]
 	path = src/deps/tinyobjloader
 	url = https://github.com/syoyo/tinyobjloader.git

src/cmake/dependencies.cmake

@@ -35,10 +35,6 @@ else()
   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${DEPS_DIR}/eigen/cmake")
 endif()
 
-if(NOT IMGUI_DIR)
-  set(IMGUI_DIR "${DEPS_DIR}/imgui")
-endif()
-
 # tinyxml2
 include_directories("${DEPS_DIR}/tinyxml2")
 add_subdirectory("${DEPS_DIR}/tinyxml2")
@@ -194,10 +190,12 @@ if(NOT USE_SYSTEM_MAGNUM)
   set(MAGNUM_BUILD_STATIC ON CACHE BOOL "" FORCE)
   set(MAGNUM_BUILD_STATIC_PIC ON CACHE BOOL "" FORCE)
 
-  # These are enabled by default but we don't need them right now -- disabling
-  # for slightly faster builds. If you need any of these, simply delete a line.
+  # These are enabled by default but we don't need them if not building GUI
+  # viewers -- disabling for slightly faster builds. If you need any of these
+  # always, simply delete a line.
   set(MAGNUM_WITH_TEXT OFF CACHE BOOL "" FORCE)
   set(MAGNUM_WITH_TEXTURETOOLS OFF CACHE BOOL "" FORCE)
+  set(MAGNUM_WITH_STBTRUETYPEFONT OFF CACHE BOOL "" FORCE)
 
   # These are not enabled by default but we need them
   set(MAGNUM_WITH_ANYSCENEIMPORTER ON CACHE BOOL "" FORCE)
@@ -215,7 +213,6 @@ if(NOT USE_SYSTEM_MAGNUM)
   set(MAGNUM_WITH_EMSCRIPTENAPPLICATION OFF CACHE BOOL "" FORCE)
   set(MAGNUM_WITH_GLFWAPPLICATION OFF CACHE BOOL "" FORCE)
   set(MAGNUM_WITH_EIGEN ON CACHE BOOL "" FORCE) # Eigen integration
-  set(MAGNUM_WITH_IMGUI ON CACHE BOOL "" FORCE) # ImGui integration
   # GltfSceneConverter and KtxImageConverter are needed only by
   # BatchRendererTest and are optional
   #set(MAGNUM_WITH_GLTFSCENECONVERTER ON CACHE BOOL "" FORCE)
@@ -298,6 +295,9 @@ if(NOT USE_SYSTEM_MAGNUM)
   endif()
 
   if(BUILD_GUI_VIEWERS)
+    set(MAGNUM_WITH_TEXT ON CACHE BOOL "" FORCE)
+    set(MAGNUM_WITH_STBTRUETYPEFONT ON CACHE BOOL "" FORCE)
+
     if(CORRADE_TARGET_EMSCRIPTEN)
       set(MAGNUM_WITH_EMSCRIPTENAPPLICATION ON CACHE BOOL "" FORCE)
     else()

src/esp/bindings/CMakeLists.txt

@@ -36,6 +36,13 @@ target_link_libraries(
          sim
 )
 
+# Make Magnum text rendering (used by the native viewer) available for Python
+# as well
+if(BUILD_GUI_VIEWERS)
+  find_package(MagnumPlugins REQUIRED StbTrueTypeFont)
+  target_link_libraries(habitat_sim_bindings PRIVATE MagnumPlugins::StbTrueTypeFont)
+endif()
+
 if(BUILD_WITH_AUDIO)
   add_custom_command(
     TARGET habitat_sim_bindings POST_BUILD

src/utils/viewer/CMakeLists.txt

@@ -1,11 +1,12 @@
-find_package(Magnum REQUIRED DebugTools)
-
-find_package(MagnumIntegration REQUIRED ImGui)
+find_package(Magnum REQUIRED DebugTools Text)
+find_package(MagnumPlugins REQUIRED StbTrueTypeFont)
 
 set(viewer_SOURCES viewer.cpp ObjectPickingHelper.cpp ObjectPickingHelper.h)
 
+corrade_add_resource(viewer_RESOURCES resources.conf)
+
 #set_directory_properties(PROPERTIES CORRADE_USE_PEDANTIC_FLAGS ON)
-add_executable(viewer ${viewer_SOURCES})
+add_executable(viewer ${viewer_SOURCES} ${viewer_RESOURCES})
 
 target_link_libraries(
   viewer
@@ -16,7 +17,8 @@ target_link_libraries(
           sim
           geo
           Magnum::DebugTools
-          MagnumIntegration::ImGui
+          Magnum::Text
+          MagnumPlugins::StbTrueTypeFont
 )
 
 # copy JS/HTML/CSS scaffolding for WebGL build

src/utils/viewer/resources.conf

@@ -0,0 +1,4 @@
+group=fonts
+
+[file]
+filename=ProggyClean.ttf