Build ImGui

.gitmodules

@@ -23,3 +23,7 @@
 [submodule "dependencies/runtime/src"]
 	path = dependencies/runtime/src
 	url = https://gitea.thebrokenrail.com/minecraft-pi-reborn/runtime.git
+[submodule "dependencies/imgui/src"]
+	path = dependencies/imgui/src
+	url = https://github.com/ocornut/imgui.git
+	ignore = dirty

dependencies/CMakeLists.txt

@@ -19,12 +19,16 @@ endif()
 # Extra Runtime
 add_subdirectory(runtime)
 # GLFW
-if(BUILD_MEDIA_LAYER_CORE)
+if(BUILD_NATIVE_COMPONENTS OR BUILD_MEDIA_LAYER_CORE)
     add_subdirectory(glfw)
 endif()
+# ImGui
+if(BUILD_NATIVE_COMPONENTS)
+    add_subdirectory(imgui)
+endif()
 # UTF8-CPP
 add_subdirectory(utf8cpp)
-# Symbol Prcoessor
+# Symbol Processor
 if(BUILD_ARM_COMPONENTS)
     add_subdirectory(symbol-processor)
 endif()

dependencies/glfw/CMakeLists.txt

@@ -24,4 +24,4 @@ unset(MESSAGE_QUIET)
 setup_library(glfw TRUE FALSE)
 
 # License
-install(FILES src/LICENSE.md DESTINATION "${MCPI_LEGAL_DIR}/glfw")
+install(FILES src/LICENSE.md DESTINATION "${MCPI_LEGAL_DIR}/GLFW")

dependencies/imgui/CMakeLists.txt

@@ -0,0 +1,41 @@
+project(imgui)
+
+# Silence Warnings
+add_compile_options(-w)
+
+## ImGui
+
+# Build
+add_library(imgui SHARED
+    src/imgui.cpp
+    src/imgui_draw.cpp
+    src/imgui_tables.cpp
+    src/imgui_widgets.cpp
+    src/backends/imgui_impl_glfw.cpp
+    src/backends/imgui_impl_opengl2.cpp
+)
+setup_header_dirs(imgui
+    "${CMAKE_CURRENT_SOURCE_DIR}/src"
+    "${CMAKE_CURRENT_SOURCE_DIR}/src/backends"
+)
+find_package(OpenGL REQUIRED)
+target_link_libraries(imgui PUBLIC glfw OpenGL::GL)
+
+# Patch
+function(run_patch)
+    execute_process(
+        COMMAND "patch" "-p1" "--quiet" ${ARGN}
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/src"
+        INPUT_FILE "${CMAKE_CURRENT_SOURCE_DIR}/fix-hidpi.patch"
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+endfunction()
+# https://stackoverflow.com/a/79041978
+run_patch("--batch" "--reverse")
+run_patch()
+
+# Install
+setup_library(imgui TRUE TRUE)
+
+# License
+install(FILES src/LICENSE.txt DESTINATION "${MCPI_LEGAL_DIR}/ImGui")

dependencies/imgui/fix-hidpi.patch

@@ -0,0 +1,55 @@
+--- a/backends/imgui_impl_glfw.cpp
++++ b/backends/imgui_impl_glfw.cpp
+@@ -422,6 +422,21 @@ void ImGui_ImplGlfw_WindowFocusCallback(GLFWwindow* window, int focused)
+     io.AddFocusEvent(focused != 0);
+ }
+ 
++static void ImGui_ImplGlfw_ScaleMousePos(GLFWwindow* window, double &x, double &y) {
++    // Get Window Size
++    int window_width, window_height;
++    glfwGetWindowSize(window, &window_width, &window_height);
++    if (window_width <= 0 || window_height <= 0) {
++        return;
++    }
++    // Get Framebuffer Size
++    int framebuffer_width, framebuffer_height;
++    glfwGetFramebufferSize(window, &framebuffer_width, &framebuffer_height);
++    // Multiply
++    x *= double(framebuffer_width) / double(window_width);
++    y *= double(framebuffer_height) / double(window_height);
++}
++
+ void ImGui_ImplGlfw_CursorPosCallback(GLFWwindow* window, double x, double y)
+ {
+     ImGui_ImplGlfw_Data* bd = ImGui_ImplGlfw_GetBackendData();
+@@ -429,6 +444,7 @@ void ImGui_ImplGlfw_CursorPosCallback(GLFWwindow* window, double x, double y)
+         bd->PrevUserCallbackCursorPos(window, x, y);
+ 
+     ImGuiIO& io = ImGui::GetIO();
++    ImGui_ImplGlfw_ScaleMousePos(window, x, y);
+     io.AddMousePosEvent((float)x, (float)y);
+     bd->LastValidMousePos = ImVec2((float)x, (float)y);
+ }
+@@ -738,6 +754,7 @@ static void ImGui_ImplGlfw_UpdateMouseData()
+             {
+                 double mouse_x, mouse_y;
+                 glfwGetCursorPos(window, &mouse_x, &mouse_y);
++                ImGui_ImplGlfw_ScaleMousePos(window, mouse_x, mouse_y);
+                 bd->LastValidMousePos = ImVec2((float)mouse_x, (float)mouse_y);
+                 io.AddMousePosEvent((float)mouse_x, (float)mouse_y);
+             }
+@@ -831,13 +848,9 @@ void ImGui_ImplGlfw_NewFrame()
+     IM_ASSERT(bd != nullptr && "Context or backend not initialized! Did you call ImGui_ImplGlfw_InitForXXX()?");
+ 
+     // Setup display size (every frame to accommodate for window resizing)
+-    int w, h;
+     int display_w, display_h;
+-    glfwGetWindowSize(bd->Window, &w, &h);
+     glfwGetFramebufferSize(bd->Window, &display_w, &display_h);
+-    io.DisplaySize = ImVec2((float)w, (float)h);
+-    if (w > 0 && h > 0)
+-        io.DisplayFramebufferScale = ImVec2((float)display_w / (float)w, (float)display_h / (float)h);
++    io.DisplaySize = ImVec2((float)display_w, (float)display_h);
+ 
+     // Setup time step
+     // (Accept glfwGetTime() not returning a monotonically increasing value. Seems to happens on disconnecting peripherals and probably on VMs and Emscripten, see #6491, #6189, #6114, #3644)

dependencies/imgui/src

@@ -0,0 +1 @@
+Subproject commit eb0ad66d88d96be3ccad31e22ef9d3126ec79ef2

dependencies/runtime/CMakeLists.txt

@@ -11,3 +11,9 @@ endif()
 
 # Build
 add_subdirectory(src)
+
+# RPath
+if(TARGET runtime)
+    set_target_properties(runtime PROPERTIES INSTALL_RPATH "$ORIGIN/../lib/native")
+    target_link_options(runtime PRIVATE "LINKER:--disable-new-dtags")
+endif()

dependencies/runtime/src

@@ -1 +1 @@
-Subproject commit b42021ba5d45c29e22cbdd887e2fae5a1c1334a1
+Subproject commit 043d926f32a3315d92bce1d9bbb0ccdcf99c11a2

dependencies/utf8cpp/CMakeLists.txt

@@ -9,4 +9,4 @@ add_compile_options(-w)
 add_subdirectory(src EXCLUDE_FROM_ALL)
 
 # License
-install(FILES src/LICENSE DESTINATION "${MCPI_LEGAL_DIR}/utf8cpp")
+install(FILES src/LICENSE DESTINATION "${MCPI_LEGAL_DIR}/UTF8-CPP")