support imgui

Former-commit-id: da1cf26

CMakeLists.txt

@@ -19,3 +19,5 @@ add_subdirectory(HinaGUI)
 #START("LOADING SAMPLES")
 add_subdirectory(samples)
 #END("SAMPLES DONE")
+
+add_definitions(-DHINAGUI_SCENE_DIR="${CMAKE_CURRENT_SOURCE_DIR}/scenes/")

HinaGUI/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(ImGUI_LIB libimgui)
 file(GLOB_RECURSE HINA_GUI_SRC *.h *.cpp)
 add_library(HinaGUI ${HINA_GUI_SRC})
+target_include_directories(HinaGUI PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(HinaGUI PRIVATE ${ImGUI_LIB})

HinaGUI/HinaViewer.cpp

@@ -2,11 +2,32 @@
 
 using namespace HinaGUI;
 
+void HinaViewer::init(const std::string &json_file)
+{
+    DescInitable::init(json_file);
+
+    auto name = desc_->as<HinaViewerDesc>()->name;
+    auto width = desc_->as<HinaViewerDesc>()->width;
+    auto height = desc_->as<HinaViewerDesc>()->height;
+    auto pos_x = desc_->as<HinaViewerDesc>()->pos_x;
+    auto pos_y = desc_->as<HinaViewerDesc>()->pos_y;
+
+    window_ = new Window();
+    window_->init(name, width, height, pos_x, pos_y);
+}
+
+void HinaViewer::resize(int width, int height)
+{
+    desc_->as<HinaViewerDesc>()->width = width;
+    desc_->as<HinaViewerDesc>()->height = height;
+}
+
 void HinaViewer::parse(const nlohmann::json &json)
 {
     DescInitable::parse(json);
     auto res = new HinaViewerDesc();
 
+    res->name = json["name"];
     res->pos_x = json["pos_x"];
     res->pos_y = json["pos_y"];
     res->width = json["width"];
@@ -15,8 +36,12 @@ void HinaViewer::parse(const nlohmann::json &json)
     desc_ = res;
 }
 
-void HinaViewer::resize(int width, int height)
+void HinaViewer::launch()
 {
-    desc_->as<HinaViewerDesc>()->width = width;
-    desc_->as<HinaViewerDesc>()->height = height;
+    window_->render();
+}
+
+void HinaViewer::kill()
+{
+    window_->kill();
 }

HinaGUI/HinaViewer.h

@@ -2,6 +2,7 @@
 #define HINAGUI_HINAVIEWER_H
 
 #include "base/DescInitable.h"
+#include "core/Window.h"
 
 namespace HinaGUI
 {
@@ -10,14 +11,22 @@ namespace HinaGUI
     public:
         struct HinaViewerDesc : public Desc
         {
-            int pos_x, pos_y;
+            std::string name;
             int width, height;
+            int pos_x, pos_y;
         };
 
+    public:
+        void init(const std::string &json_file) override;
+        void launch();
+        void kill();
         void resize(int width, int height);
 
     protected:
         void parse(const nlohmann::json &json) override;
+
+    protected:
+        Window *window_ = nullptr;
     };
 }
 

HinaGUI/base/DescInitable.cpp

@@ -7,6 +7,7 @@ void HinaGUI::Base::DescInitable::init(const std::string &json_file)
     json_file_ = json_file;
     nlohmann::json json = nlohmann::json::parse(std::ifstream(json_file));
     parse(json);
+    inited = true;
 }
 
 void HinaGUI::Base::DescInitable::parse(const nlohmann::json &json)

HinaGUI/base/DescInitable.h

@@ -22,12 +22,13 @@ namespace HinaGUI::Base
         };
 
     public:
-        void init(const std::string &json_file);
+        virtual void init(const std::string &json_file);
 
     protected:
         virtual void parse(const nlohmann::json &json);
         Desc *desc_ = nullptr; // DISABLE arbitrary altering from outside
         std::string json_file_;
+        bool inited = false;
     };
 }
 

HinaGUI/base/defines.h

@@ -0,0 +1,6 @@
+#ifndef HINAGUI_DEFINES_H
+#define HINAGUI_DEFINES_H
+
+#define HINA_INLINE
+
+#endif //HINAGUI_DEFINES_H

HinaGUI/core/Window.cpp

@@ -0,0 +1,103 @@
+#include "Window.h"
+
+#include <utility>
+
+void Window::init(const std::string &window_name, int width, int height, int pos_x, int pos_y)
+{
+    init_opengl(window_name, width, height, pos_x, pos_y);
+    init_imgui();
+}
+
+void Window::kill()
+{
+    kill_imgui();
+    kill_opengl();
+    window_ = nullptr;
+}
+
+void Window::render()
+{
+    while (!glfwWindowShouldClose(window_))
+    {
+        if (glfwGetKey(window_, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+            glfwSetWindowShouldClose(window_, true);
+
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+
+        {
+            static float f = 0.0f;
+            static int counter = 0;
+
+            ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.
+
+            ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
+
+            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
+
+            if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
+                counter++;
+            ImGui::SameLine();
+            ImGui::Text("counter = %d", counter);
+
+            ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+            ImGui::End();
+        }
+
+        ImGui::Render();
+
+        glClearColor(1.f, 1.f, 1.f, 1.f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        glfwSwapBuffers(window_);
+        glfwPollEvents();
+    }
+}
+
+void Window::init_opengl(const std::string &window_name, int width, int height, int pos_x, int pos_y)
+{
+    glfwInit();
+    glfwWindowHint(GLFW_SAMPLES, 8); // MSAA samples
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+#ifdef __APPLE__
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
+
+    window_ = glfwCreateWindow(width, height, window_name.c_str(), nullptr, nullptr);
+    glfwSetWindowPos(window_, pos_x, pos_y);
+    glfwMakeContextCurrent(window_);
+
+    gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
+}
+
+void Window::init_imgui()
+{
+    ImGui::CreateContext();
+    ImGuiIO &io = ImGui::GetIO();
+    (void) io;
+
+    // Setup Dear ImGui style
+    ImGui::StyleColorsLight();
+    ImGui_ImplGlfw_InitForOpenGL(window_, true);
+    ImGui_ImplOpenGL3_Init("#version 330 core");
+
+    // TODO: Load Fonts
+}
+
+void Window::kill_opengl()
+{
+    glfwDestroyWindow(window_);
+    glfwTerminate();
+}
+
+void Window::kill_imgui()
+{
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplGlfw_Shutdown();
+    ImGui::DestroyContext();
+}

HinaGUI/core/Window.h

@@ -0,0 +1,33 @@
+#ifndef HINAGUI_WINDOW_H
+#define HINAGUI_WINDOW_H
+
+#include "glad/glad.h"
+#include "GLFW/glfw3.h"
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+#include "implot.h"
+
+#include "../base/defines.h"
+
+#include <string>
+
+// default OpenGL backend window, TODO: support multi-backend
+class Window
+{
+public:
+    void init(const std::string &window_name, int width, int height, int pos_x = 0, int pos_y = 0);
+    void render();
+    void kill();
+
+protected:
+    void init_opengl(const std::string &window_name, int width, int height, int pos_x = 0, int pos_y = 0);
+    void init_imgui();
+    void kill_opengl();
+    void kill_imgui();
+
+protected:
+    GLFWwindow *window_ = nullptr;
+};
+
+#endif //HINAGUI_WINDOW_H

samples/sample3/1.json

@@ -1,6 +1,7 @@
 {
-  "pos_x": 1,
-  "pos_y": 2,
-  "width": 3,
-  "height": 4
+  "name": "Hina Window",
+  "width": 1024,
+  "height": 768,
+  "pos_x": 0,
+  "pos_y": 0
 }

samples/sample4/main.cpp

@@ -3,6 +3,8 @@
 int main()
 {
     HinaGUI::HinaViewer viewer;
-    viewer.init("C:/Users/Administrator/Desktop/BFU_Graphics/HinaGUI/samples/sample3/1.json");
+    viewer.init("/Users/xayah/Desktop/BFU-Graphics/HinaGUI/samples/sample3/1.json");
+    viewer.launch();
+    viewer.kill();
     return 0;
 }