1 // Dear ImGui: standalone example application for Allegro 5
2 // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
3 // Read online: https://github.com/ocornut/imgui/tree/master/docs
4 
5 // On Windows, you can install Allegro5 using vcpkg:
6 //   git clone https://github.com/Microsoft/vcpkg
7 //   cd vcpkg
8 //   bootstrap - vcpkg.bat
9 //   vcpkg install allegro5 --triplet=x86-windows   ; for win32
10 //   vcpkg install allegro5 --triplet=x64-windows   ; for win64
11 //   vcpkg integrate install                        ; register include and libs in Visual Studio
12 
13 #include <stdint.h>
14 #include <allegro5/allegro.h>
15 #include <allegro5/allegro_primitives.h>
16 #include "imgui.h"
17 #include "imgui_impl_allegro5.h"
18 
main(int, char**)19 int main(int, char**)
20 {
21     // Setup Allegro
22     al_init();
23     al_install_keyboard();
24     al_install_mouse();
25     al_init_primitives_addon();
26     al_set_new_display_flags(ALLEGRO_RESIZABLE);
27     ALLEGRO_DISPLAY* display = al_create_display(1280, 720);
28     al_set_window_title(display, "Dear ImGui Allegro 5 example");
29     ALLEGRO_EVENT_QUEUE* queue = al_create_event_queue();
30     al_register_event_source(queue, al_get_display_event_source(display));
31     al_register_event_source(queue, al_get_keyboard_event_source());
32     al_register_event_source(queue, al_get_mouse_event_source());
33 
34     // Setup Dear ImGui context
35     IMGUI_CHECKVERSION();
36     ImGui::CreateContext();
37     ImGuiIO& io = ImGui::GetIO(); (void)io;
38     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
39 
40     // Setup Dear ImGui style
41     ImGui::StyleColorsDark();
42     //ImGui::StyleColorsClassic();
43 
44     // Setup Platform/Renderer backends
45     ImGui_ImplAllegro5_Init(display);
46 
47     // Load Fonts
48     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
49     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
50     // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
51     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
52     // - Read 'docs/FONTS.md' for more instructions and details.
53     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
54     //io.Fonts->AddFontDefault();
55     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
56     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
57     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
58     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
59     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
60     //IM_ASSERT(font != NULL);
61 
62     bool show_demo_window = true;
63     bool show_another_window = false;
64     ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
65 
66     // Main loop
67     bool running = true;
68     while (running)
69     {
70         // Poll and handle events (inputs, window resize, etc.)
71         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
72         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
73         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
74         // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
75         ALLEGRO_EVENT ev;
76         while (al_get_next_event(queue, &ev))
77         {
78             ImGui_ImplAllegro5_ProcessEvent(&ev);
79             if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
80                 running = false;
81             if (ev.type == ALLEGRO_EVENT_DISPLAY_RESIZE)
82             {
83                 ImGui_ImplAllegro5_InvalidateDeviceObjects();
84                 al_acknowledge_resize(display);
85                 ImGui_ImplAllegro5_CreateDeviceObjects();
86             }
87         }
88 
89         // Start the Dear ImGui frame
90         ImGui_ImplAllegro5_NewFrame();
91         ImGui::NewFrame();
92 
93         // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
94         if (show_demo_window)
95             ImGui::ShowDemoWindow(&show_demo_window);
96 
97         // 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
98         {
99             static float f = 0.0f;
100             static int counter = 0;
101 
102             ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.
103 
104             ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
105             ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
106             ImGui::Checkbox("Another Window", &show_another_window);
107 
108             ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
109             ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
110 
111             if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
112                 counter++;
113             ImGui::SameLine();
114             ImGui::Text("counter = %d", counter);
115 
116             ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
117             ImGui::End();
118         }
119 
120         // 3. Show another simple window.
121         if (show_another_window)
122         {
123             ImGui::Begin("Another Window", &show_another_window);   // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
124             ImGui::Text("Hello from another window!");
125             if (ImGui::Button("Close Me"))
126                 show_another_window = false;
127             ImGui::End();
128         }
129 
130         // Rendering
131         ImGui::Render();
132         al_clear_to_color(al_map_rgba_f(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w));
133         ImGui_ImplAllegro5_RenderDrawData(ImGui::GetDrawData());
134         al_flip_display();
135     }
136 
137     // Cleanup
138     ImGui_ImplAllegro5_Shutdown();
139     ImGui::DestroyContext();
140     al_destroy_event_queue(queue);
141     al_destroy_display(display);
142 
143     return 0;
144 }
145