Build library and examples using CMake on macos

.gitignore

@@ -1,15 +1,10 @@
-### Project ### 
-
-TODO.md
-
-### ImGui ###
-**.ini
-
 ### Local build ###
 bin/
-build/
+build*/
 lib/
-imnodes.sln
+
+### ImGui ###
+**.ini
 
 # Created by https://www.toptal.com/developers/gitignore/api/sublimetext
 # Edit at https://www.toptal.com/developers/gitignore?templates=sublimetext
@@ -499,4 +494,38 @@ healthchecksdb
 # Backup folder for Package Reference Convert tool in Visual Studio 2017
 MigrationBackup/
 
-# End of https://www.gitignore.io/api/visualstudio
+# End of https://www.gitignore.io/api/visualstudio
+
+# Created by https://www.toptal.com/developers/gitignore/api/vcpkg
+# Edit at https://www.toptal.com/developers/gitignore?templates=vcpkg
+
+### vcpkg ###
+# Vcpkg
+
+## Manifest Mode
+vcpkg_installed/
+
+# End of https://www.toptal.com/developers/gitignore/api/vcpkg
+
+
+# Created by https://www.toptal.com/developers/gitignore/api/cmake
+# Edit at https://www.toptal.com/developers/gitignore?templates=cmake
+
+### CMake ###
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+
+### CMake Patch ###
+# External projects
+*-prefix/
+
+# End of https://www.toptal.com/developers/gitignore/api/cmake

CMakeLists.txt

@@ -0,0 +1,59 @@
+cmake_minimum_required(VERSION 3.15)
+
+project(imnodes)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+find_package(imgui CONFIG REQUIRED)
+find_package(SDL2 CONFIG REQUIRED)
+
+
+# Imnodes
+
+add_library(imnodes)
+target_sources(imnodes PRIVATE
+    imnodes.h
+    imnodes_internal.h
+    imnodes.cpp)
+target_include_directories(imnodes PUBLIC ${CMAKE_SOURCE_DIR})
+target_link_libraries(imnodes PUBLIC imgui::imgui)
+
+
+# Example projects
+
+add_executable(colornode
+    ${CMAKE_SOURCE_DIR}/imnodes.cpp
+    ${CMAKE_SOURCE_DIR}/example/main.cpp
+    ${CMAKE_SOURCE_DIR}/example/color_node_editor.cpp)
+target_link_libraries(colornode imnodes SDL2::SDL2)
+if (APPLE)
+    target_link_libraries(colornode "-framework OpenGL")
+endif()
+
+add_executable(multieditor
+    ${CMAKE_SOURCE_DIR}/imnodes.cpp 
+    ${CMAKE_SOURCE_DIR}/example/main.cpp
+    ${CMAKE_SOURCE_DIR}/example/multi_editor.cpp)
+target_link_libraries(multieditor imnodes SDL2::SDL2)
+if (APPLE)
+    target_link_libraries(multieditor "-framework OpenGL")
+endif()
+
+add_executable(saveload
+    ${CMAKE_SOURCE_DIR}/imnodes.cpp
+    ${CMAKE_SOURCE_DIR}/example/main.cpp
+    ${CMAKE_SOURCE_DIR}/example/save_load.cpp)
+target_link_libraries(saveload imnodes SDL2::SDL2)
+if (APPLE)
+    target_link_libraries(saveload "-framework OpenGL")
+endif()
+
+add_executable(hello
+    ${CMAKE_SOURCE_DIR}/imnodes.cpp
+    ${CMAKE_SOURCE_DIR}/example/main.cpp
+    ${CMAKE_SOURCE_DIR}/example/hello.cpp)
+target_link_libraries(hello imnodes SDL2::SDL2)
+if (APPLE)
+    target_link_libraries(hello "-framework OpenGL")
+endif()

example/color_node_editor.cpp

@@ -4,8 +4,8 @@
 #include <imnodes.h>
 #include <imgui.h>
 
-#include <SDL_keycode.h>
-#include <SDL_timer.h>
+#include <SDL2/SDL_keycode.h>
+#include <SDL2/SDL_timer.h>
 #include <algorithm>
 #include <cassert>
 #include <chrono>
@@ -123,8 +123,11 @@ ImU32 evaluate(const Graph<Node>& graph, const int root_node)
 class ColorNodeEditor
 {
 public:
-    ColorNodeEditor() : graph_(), nodes_(), root_node_id_(-1),
-        minimap_location_(ImNodesMiniMapLocation_BottomRight) {}
+    ColorNodeEditor()
+        : graph_(), nodes_(), root_node_id_(-1),
+          minimap_location_(ImNodesMiniMapLocation_BottomRight)
+    {
+    }
 
     void show()
     {

example/main.cpp

@@ -1,26 +1,39 @@
 #include "node_editor.h"
+
 #include <imgui.h>
 #include <imgui_impl_sdl.h>
 #include <imgui_impl_opengl3.h>
 #include <imnodes.h>
+#include <SDL2/SDL.h>
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+#include <SDL2/SDL_opengles2.h>
+#else
+#include <SDL2/SDL_opengl.h>
+#endif
+
 #include <stdio.h>
-#include <SDL.h>
-#include <GL/gl3w.h>
 
 int main(int, char**)
 {
-    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0)
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
     {
         printf("Error: %s\n", SDL_GetError());
         return -1;
     }
 
-#if __APPLE__
+    // Decide GL+GLSL versions
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+    // GL ES 2.0 + GLSL 100
+    const char* glsl_version = "#version 100";
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#elif defined(__APPLE__)
     // GL 3.2 Core + GLSL 150
     const char* glsl_version = "#version 150";
     SDL_GL_SetAttribute(
-        SDL_GL_CONTEXT_FLAGS,
-        SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
+        SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
@@ -33,48 +46,48 @@ int main(int, char**)
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
 #endif
 
+    // Create window with graphics context
     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
     SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
-    SDL_DisplayMode current;
-    SDL_GetCurrentDisplayMode(0, &current);
+    SDL_WindowFlags window_flags =
+        (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
     SDL_Window* window = SDL_CreateWindow(
-        "imgui-node-editor example",
+        "Dear ImGui SDL2+OpenGL3 example",
         SDL_WINDOWPOS_CENTERED,
         SDL_WINDOWPOS_CENTERED,
         1280,
         720,
-        SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
+        window_flags);
     SDL_GLContext gl_context = SDL_GL_CreateContext(window);
     SDL_GL_MakeCurrent(window, gl_context);
     SDL_GL_SetSwapInterval(1); // Enable vsync
 
-    if (gl3wInit())
-    {
-        fprintf(stderr, "Failed to initialize OpenGL loader!\n");
-        return 1;
-    }
-
+    // Setup Dear ImGui context
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
-
-    ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
-    ImGui_ImplOpenGL3_Init(glsl_version);
+    ImGuiIO& io = ImGui::GetIO();
+    (void)io;
 
     ImNodes::CreateContext();
+    example::NodeEditorInitialize();
 
-    // Setup style
+    // Setup Dear ImGui style
     ImGui::StyleColorsDark();
+    // ImGui::StyleColorsClassic();
     ImNodes::StyleColorsDark();
 
-    bool done = false;
-    bool initialized = false;
+    // Setup Platform/Renderer backends
+    ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
+    ImGui_ImplOpenGL3_Init(glsl_version);
 
-    {
-        const ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
-        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
-    }
+    // Our state
+    bool   show_demo_window = true;
+    bool   show_another_window = false;
+    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
 
+    // Main loop
+    bool done = false;
     while (!done)
     {
         SDL_Event event;
@@ -93,31 +106,26 @@ int main(int, char**)
         ImGui_ImplSDL2_NewFrame();
         ImGui::NewFrame();
 
-        if (!initialized)
-        {
-            initialized = true;
-            example::NodeEditorInitialize();
-        }
-
         example::NodeEditorShow();
 
         // Rendering
         ImGui::Render();
-
-        int fb_width, fb_height;
-        SDL_GL_GetDrawableSize(window, &fb_width, &fb_height);
-        glViewport(0, 0, fb_width, fb_height);
+        glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
+        glClearColor(
+            clear_color.x * clear_color.w,
+            clear_color.y * clear_color.w,
+            clear_color.z * clear_color.w,
+            clear_color.w);
         glClear(GL_COLOR_BUFFER_BIT);
-
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
         SDL_GL_SwapWindow(window);
     }
 
-    example::NodeEditorShutdown();
-    ImNodes::DestroyContext();
-
+    // Cleanup
     ImGui_ImplOpenGL3_Shutdown();
     ImGui_ImplSDL2_Shutdown();
+    example::NodeEditorShutdown();
+    ImNodes::DestroyContext();
     ImGui::DestroyContext();
 
     SDL_GL_DeleteContext(gl_context);

vcpkg.json

@@ -0,0 +1,11 @@
+{
+    "name": "imnodes",
+    "version-string": "0.1.0-dev",
+    "dependencies": [
+        "sdl2",
+        {
+          "name": "imgui",
+          "features": [ "sdl2-binding", "opengl3-binding" ]
+        }
+    ]
+}