Allegro5 example: added example from https://github.com/bggd/a5imgui_example

examples/allegro5_example/README.md

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+
+# How to Build
+
+- On Ubuntu 14.04+
+
+```bash
+g++ -I ../imgui main.cpp imgui_impl_a5.cpp ../imgui/imgui.cpp -lallegro -lallegro_primitives
+```
+
+- On Windows with Visual Studio's CLI
+
+\<a5path\> is your allegro5 folder.
+
+```
+cl /MD /I <a5path\include> /I ..\imgui main.cpp imgui_impl_a5.cpp ..\imgui\imgui.cpp /link /LIBPATH:<a5path\lib> allegro-5.0.10-monolith-md.lib user32.lib
+```
+
+public domain

examples/allegro5_example/imgui_impl_a5.cpp

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+// ImGui Allegro 5 bindings
+// by @birthggd
+// public domain
+// https://github.com/ocornut/imgui
+
+#include <stdint.h>     // uint64_t
+#include <cstring>      // memcpy
+#include <imgui.h>
+#include "imgui_impl_a5.h"
+#include <allegro5/allegro.h>
+#include <allegro5/allegro_primitives.h>
+
+#ifdef _WIN32
+#include <allegro5/allegro_windows.h>
+#endif
+
+
+static ALLEGRO_DISPLAY *g_disp = NULL;
+static ALLEGRO_BITMAP *g_img = NULL;
+static double g_time = 0.0;
+
+
+static void ImGui_ImplA5_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
+{
+  if (cmd_lists_count == 0) return;
+
+  const float width = ImGui::GetIO().DisplaySize.x;
+  const float height = ImGui::GetIO().DisplaySize.y;
+
+  const float bw = al_get_bitmap_width(g_img);
+  const float bh = al_get_bitmap_height(g_img);
+
+  int op, src, dst;
+  al_get_blender(&op, &src, &dst);
+  al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA);
+
+  #define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->Element))
+  for (int n=0; n < cmd_lists_count; ++n) {
+    const ImDrawList* cmd_list = cmd_lists[n];
+    static ImVector<ALLEGRO_VERTEX> vertices;
+    vertices.reserve(cmd_list->vtx_buffer.size());
+    vertices.clear();
+    for (int i = 0; i < cmd_list->vtx_buffer.size(); ++i) {
+      ALLEGRO_VERTEX v;
+      const ImDrawVert &dv = cmd_list->vtx_buffer[i];
+      v.x = dv.pos.x;
+      v.y = dv.pos.y;
+      v.z = 0;
+      v.u = dv.uv.x * bw;
+      v.v = dv.uv.y * bh;
+      unsigned char *c = (unsigned char*)&dv.col;
+      v.color = al_map_rgba(c[0], c[1], c[2], c[3]);
+      vertices.push_back(v);
+    }
+    int vtx_offset = 0;
+    for (size_t cmd_i=0; cmd_i < cmd_list->commands.size(); ++cmd_i) {
+      const ImDrawCmd *pcmd = &cmd_list->commands[cmd_i];
+      if (pcmd->user_callback) {
+        pcmd->user_callback(cmd_list, pcmd);
+      }
+      else {
+        ALLEGRO_BITMAP *tex = (ALLEGRO_BITMAP*)pcmd->texture_id;
+        al_set_clipping_rectangle(pcmd->clip_rect.x, pcmd->clip_rect.y, pcmd->clip_rect.z, pcmd->clip_rect.w);
+        al_draw_prim(&vertices[0], NULL, tex, vtx_offset, vtx_offset+pcmd->vtx_count, ALLEGRO_PRIM_TRIANGLE_LIST);
+      }
+      vtx_offset += pcmd->vtx_count;
+    }
+  }
+  #undef OFFSETOF
+
+  // restore state
+  al_set_blender(op, src, dst);
+  al_set_clipping_rectangle(0, 0, al_get_display_width(g_disp), al_get_display_height(g_disp));
+}
+
+
+bool Imgui_ImplA5_CreateDeviceObjects()
+{
+  ImGuiIO &io = ImGui::GetIO();
+
+  unsigned char *pixels;
+  int width, height;
+  io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
+
+  int flags = al_get_new_bitmap_flags();
+  int fmt = al_get_new_bitmap_format();
+  al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP|ALLEGRO_MIN_LINEAR|ALLEGRO_MAG_LINEAR);
+  al_set_new_bitmap_format(ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE);
+  ALLEGRO_BITMAP *img = al_create_bitmap(width, height);
+  // restore bitmap state
+  al_set_new_bitmap_flags(flags);
+  al_set_new_bitmap_format(fmt);
+  if (!img) return false;
+
+  ALLEGRO_LOCKED_REGION *locked_img;
+  locked_img = al_lock_bitmap(img, al_get_bitmap_format(img), ALLEGRO_LOCK_WRITEONLY);
+  if (!locked_img) {
+    al_destroy_bitmap(img);
+    return false;
+  }
+  memcpy(locked_img->data, pixels, sizeof(int)*width*height);
+  al_unlock_bitmap(img);
+
+  // convert software texture to hardware texture.
+  ALLEGRO_BITMAP *cloned_img = al_clone_bitmap(img);
+  al_destroy_bitmap(img);
+  if (!cloned_img) return false;
+  
+  io.Fonts->TexID = cloned_img;
+
+  g_img = cloned_img;
+
+  return true;
+}
+
+
+void ImGui_ImplA5_InvalidateDeviceObjects()
+{
+  if (g_img) {
+    al_destroy_bitmap(g_img);
+    ImGui::GetIO().Fonts->TexID = NULL;
+    g_img = NULL;
+  }
+}
+
+
+bool ImGui_ImplA5_Init(ALLEGRO_DISPLAY *disp)
+{
+  g_disp = disp;
+
+  ImGuiIO& io = ImGui::GetIO();
+  io.KeyMap[ImGuiKey_Tab] = ALLEGRO_KEY_TAB;
+  io.KeyMap[ImGuiKey_LeftArrow] = ALLEGRO_KEY_LEFT;
+  io.KeyMap[ImGuiKey_RightArrow] = ALLEGRO_KEY_RIGHT;
+  io.KeyMap[ImGuiKey_UpArrow] = ALLEGRO_KEY_UP;
+  io.KeyMap[ImGuiKey_DownArrow] = ALLEGRO_KEY_DOWN;
+  io.KeyMap[ImGuiKey_Home] = ALLEGRO_KEY_HOME;
+  io.KeyMap[ImGuiKey_End] = ALLEGRO_KEY_END;
+  io.KeyMap[ImGuiKey_Delete] = ALLEGRO_KEY_DELETE;
+  io.KeyMap[ImGuiKey_Backspace] = ALLEGRO_KEY_BACKSPACE;
+  io.KeyMap[ImGuiKey_Enter] = ALLEGRO_KEY_ENTER;
+  io.KeyMap[ImGuiKey_Escape] = ALLEGRO_KEY_ESCAPE;
+  io.KeyMap[ImGuiKey_A] = ALLEGRO_KEY_A;
+  io.KeyMap[ImGuiKey_C] = ALLEGRO_KEY_C;
+  io.KeyMap[ImGuiKey_V] = ALLEGRO_KEY_V;
+  io.KeyMap[ImGuiKey_X] = ALLEGRO_KEY_X;
+  io.KeyMap[ImGuiKey_Y] = ALLEGRO_KEY_Y;
+  io.KeyMap[ImGuiKey_Z] = ALLEGRO_KEY_Z;
+
+  io.RenderDrawListsFn = ImGui_ImplA5_RenderDrawLists;
+
+#ifdef _WIN32
+  io.ImeWindowHandle = al_get_win_window_handle(disp);
+#endif
+
+  return true;
+}
+
+
+void ImGui_ImplA5_Shutdown()
+{
+  ImGui_ImplA5_InvalidateDeviceObjects();
+  ImGui::Shutdown();
+}
+
+
+void ImGui_ImplA5_ProcessEvent(ALLEGRO_EVENT *ev)
+{
+  ImGuiIO &io = ImGui::GetIO();
+
+  switch (ev->type) {
+  case ALLEGRO_EVENT_MOUSE_AXES:
+    io.MouseWheel += ev->mouse.dz;
+    break;
+  case ALLEGRO_EVENT_KEY_CHAR:
+    if (ev->keyboard.display == g_disp) {
+      io.KeysDown[ev->keyboard.keycode] = true;
+      if (ev->keyboard.unichar > 0 && ev->keyboard.unichar < 0x10000)
+        io.AddInputCharacter((unsigned short)ev->keyboard.unichar);
+    }
+    break;
+  case ALLEGRO_EVENT_KEY_UP:
+    if (ev->keyboard.display == g_disp)
+      io.KeysDown[ev->keyboard.keycode] = false;
+    break;
+  default:
+    break;
+  }
+}
+
+
+void ImGui_ImplA5_NewFrame()
+{
+  if (!g_img) Imgui_ImplA5_CreateDeviceObjects();
+
+  ImGuiIO &io = ImGui::GetIO();
+
+  int w, h;
+  w = al_get_display_width(g_disp);
+  h = al_get_display_height(g_disp);
+  io.DisplaySize = ImVec2((float)w, (float)h);
+
+  double current_time = al_get_time();
+  io.DeltaTime = g_time > 0.0 ? (float)(current_time - g_time) : (float)(1.0f/60.0f);
+  g_time = current_time;
+  
+  ALLEGRO_KEYBOARD_STATE keys;
+  al_get_keyboard_state(&keys);
+  io.KeyCtrl = al_key_down(&keys, ALLEGRO_KEYMOD_CTRL);
+  io.KeyShift = al_key_down(&keys, ALLEGRO_KEYMOD_SHIFT);
+  io.KeyAlt = al_key_down(&keys, ALLEGRO_KEYMOD_ALT);
+
+  ALLEGRO_MOUSE_STATE mouse;
+  if (keys.display == g_disp) {
+    al_get_mouse_state(&mouse);
+    io.MousePos = ImVec2((float)mouse.x, (float)mouse.y);
+  }
+  else {
+    io.MousePos = ImVec2(-1, -1);
+  }
+
+  al_get_mouse_state(&mouse);
+  io.MouseDown[0] = mouse.buttons & 1;
+  io.MouseDown[1] = mouse.buttons & 2;
+  io.MouseDown[2] = mouse.buttons & 3;
+  
+  ImGui::NewFrame();
+}

examples/allegro5_example/imgui_impl_a5.h

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+// public domain
+
+#pragma once
+
+struct ALLEGRO_DISPLAY;
+union ALLEGRO_EVENT;
+
+bool ImGui_ImplA5_Init(ALLEGRO_DISPLAY *disp);
+void ImGui_ImplA5_ProcessEvent(ALLEGRO_EVENT *ev);
+void ImGui_ImplA5_Shutdown();
+
+void ImGui_ImplA5_NewFrame();
+
+bool Imgui_ImplA5_CreateDeviceObjects();
+void ImGui_ImplA5_InvalidateDeviceObjects();
+

examples/allegro5_example/main.cpp

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+// public domain
+
+#include <stdint.h>
+#include <allegro5/allegro.h>
+#include <allegro5/allegro_primitives.h>
+#include <imgui.h>
+#include "imgui_impl_a5.h"
+
+int main(int argc, char **argv)
+{
+  ALLEGRO_DISPLAY *disp;
+  ALLEGRO_EVENT_QUEUE *queue;
+
+  al_init();
+  al_install_keyboard();
+  al_install_mouse();
+
+  al_init_primitives_addon();
+
+  //al_set_new_display_option(ALLEGRO_VSYNC, 1, ALLEGRO_DONTCARE);
+  disp = al_create_display(1280, 800);
+
+  queue = al_create_event_queue();
+  al_register_event_source(queue, al_get_display_event_source(disp));
+  al_register_event_source(queue, al_get_keyboard_event_source());
+  al_register_event_source(queue, al_get_mouse_event_source());
+
+  ImGui_ImplA5_Init(disp);
+
+  bool show_test_window = true;
+  bool show_another_window = false;
+  ImVec4 clear_color = ImColor(114, 144, 154);
+
+  bool running = true;
+  while (running) {
+
+    ALLEGRO_EVENT ev;
+    while (al_get_next_event(queue, &ev)) {
+      ImGui_ImplA5_ProcessEvent(&ev);
+      if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE) running = false;
+    }
+
+    ImGui_ImplA5_NewFrame();
+
+    {
+      static float f;
+      ImGui::Text("Hello, world!");
+      ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+      ImGui::ColorEdit3("clear color", (float*)&clear_color);
+      if (ImGui::Button("Test Window")) show_test_window ^= 1;
+      if (ImGui::Button("Another Window")) show_another_window ^= 1;
+      ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f/ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+
+    }
+
+    if (show_another_window) {
+      ImGui::SetNextWindowSize(ImVec2(200, 100), ImGuiSetCond_FirstUseEver);
+      ImGui::Begin("Another Window", &show_another_window);
+      ImGui::Text("Hello");
+      ImGui::End();
+    }
+
+    if (show_test_window) {
+      ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiSetCond_FirstUseEver);
+      ImGui::ShowTestWindow(&show_test_window);
+    }
+ 
+    al_clear_to_color(al_map_rgba_f(clear_color.x, clear_color.y, clear_color.z, clear_color.w));
+    ImGui::Render();
+    al_flip_display();
+  }
+
+  ImGui_ImplA5_Shutdown();
+
+  al_destroy_event_queue(queue);
+  al_destroy_display(disp);
+
+  return 0;
+}
+