mirror of https://github.com/ocornut/imgui
Allegro5 example: added example from https://github.com/bggd/a5imgui_example
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ocornut
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# How to Build
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- On Ubuntu 14.04+
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```bash
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g++ -I ../imgui main.cpp imgui_impl_a5.cpp ../imgui/imgui.cpp -lallegro -lallegro_primitives
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```
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- On Windows with Visual Studio's CLI
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\<a5path\> is your allegro5 folder.
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```
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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
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```
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public domain
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// ImGui Allegro 5 bindings
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// by @birthggd
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// public domain
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// https://github.com/ocornut/imgui
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#include <stdint.h> // uint64_t
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#include <cstring> // memcpy
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#include <imgui.h>
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#include "imgui_impl_a5.h"
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#include <allegro5/allegro.h>
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#include <allegro5/allegro_primitives.h>
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#ifdef _WIN32
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#include <allegro5/allegro_windows.h>
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#endif
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static ALLEGRO_DISPLAY *g_disp = NULL;
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static ALLEGRO_BITMAP *g_img = NULL;
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static double g_time = 0.0;
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static void ImGui_ImplA5_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
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{
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if (cmd_lists_count == 0) return;
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const float width = ImGui::GetIO().DisplaySize.x;
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const float height = ImGui::GetIO().DisplaySize.y;
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const float bw = al_get_bitmap_width(g_img);
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const float bh = al_get_bitmap_height(g_img);
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int op, src, dst;
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al_get_blender(&op, &src, &dst);
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al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA);
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#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->Element))
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for (int n=0; n < cmd_lists_count; ++n) {
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const ImDrawList* cmd_list = cmd_lists[n];
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static ImVector<ALLEGRO_VERTEX> vertices;
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vertices.reserve(cmd_list->vtx_buffer.size());
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vertices.clear();
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for (int i = 0; i < cmd_list->vtx_buffer.size(); ++i) {
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ALLEGRO_VERTEX v;
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const ImDrawVert &dv = cmd_list->vtx_buffer[i];
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v.x = dv.pos.x;
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v.y = dv.pos.y;
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v.z = 0;
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v.u = dv.uv.x * bw;
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v.v = dv.uv.y * bh;
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unsigned char *c = (unsigned char*)&dv.col;
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v.color = al_map_rgba(c[0], c[1], c[2], c[3]);
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vertices.push_back(v);
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}
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int vtx_offset = 0;
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for (size_t cmd_i=0; cmd_i < cmd_list->commands.size(); ++cmd_i) {
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const ImDrawCmd *pcmd = &cmd_list->commands[cmd_i];
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if (pcmd->user_callback) {
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pcmd->user_callback(cmd_list, pcmd);
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}
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else {
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ALLEGRO_BITMAP *tex = (ALLEGRO_BITMAP*)pcmd->texture_id;
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al_set_clipping_rectangle(pcmd->clip_rect.x, pcmd->clip_rect.y, pcmd->clip_rect.z, pcmd->clip_rect.w);
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al_draw_prim(&vertices[0], NULL, tex, vtx_offset, vtx_offset+pcmd->vtx_count, ALLEGRO_PRIM_TRIANGLE_LIST);
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}
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vtx_offset += pcmd->vtx_count;
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}
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}
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#undef OFFSETOF
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// restore state
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al_set_blender(op, src, dst);
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al_set_clipping_rectangle(0, 0, al_get_display_width(g_disp), al_get_display_height(g_disp));
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}
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bool Imgui_ImplA5_CreateDeviceObjects()
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{
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ImGuiIO &io = ImGui::GetIO();
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unsigned char *pixels;
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int width, height;
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io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
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int flags = al_get_new_bitmap_flags();
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int fmt = al_get_new_bitmap_format();
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al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP|ALLEGRO_MIN_LINEAR|ALLEGRO_MAG_LINEAR);
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al_set_new_bitmap_format(ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE);
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ALLEGRO_BITMAP *img = al_create_bitmap(width, height);
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// restore bitmap state
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al_set_new_bitmap_flags(flags);
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al_set_new_bitmap_format(fmt);
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if (!img) return false;
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ALLEGRO_LOCKED_REGION *locked_img;
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locked_img = al_lock_bitmap(img, al_get_bitmap_format(img), ALLEGRO_LOCK_WRITEONLY);
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if (!locked_img) {
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al_destroy_bitmap(img);
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return false;
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}
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memcpy(locked_img->data, pixels, sizeof(int)*width*height);
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al_unlock_bitmap(img);
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// convert software texture to hardware texture.
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ALLEGRO_BITMAP *cloned_img = al_clone_bitmap(img);
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al_destroy_bitmap(img);
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if (!cloned_img) return false;
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io.Fonts->TexID = cloned_img;
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g_img = cloned_img;
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return true;
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}
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void ImGui_ImplA5_InvalidateDeviceObjects()
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{
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if (g_img) {
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al_destroy_bitmap(g_img);
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ImGui::GetIO().Fonts->TexID = NULL;
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g_img = NULL;
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}
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}
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bool ImGui_ImplA5_Init(ALLEGRO_DISPLAY *disp)
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{
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g_disp = disp;
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ImGuiIO& io = ImGui::GetIO();
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io.KeyMap[ImGuiKey_Tab] = ALLEGRO_KEY_TAB;
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io.KeyMap[ImGuiKey_LeftArrow] = ALLEGRO_KEY_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = ALLEGRO_KEY_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = ALLEGRO_KEY_UP;
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io.KeyMap[ImGuiKey_DownArrow] = ALLEGRO_KEY_DOWN;
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io.KeyMap[ImGuiKey_Home] = ALLEGRO_KEY_HOME;
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io.KeyMap[ImGuiKey_End] = ALLEGRO_KEY_END;
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io.KeyMap[ImGuiKey_Delete] = ALLEGRO_KEY_DELETE;
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io.KeyMap[ImGuiKey_Backspace] = ALLEGRO_KEY_BACKSPACE;
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io.KeyMap[ImGuiKey_Enter] = ALLEGRO_KEY_ENTER;
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io.KeyMap[ImGuiKey_Escape] = ALLEGRO_KEY_ESCAPE;
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io.KeyMap[ImGuiKey_A] = ALLEGRO_KEY_A;
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io.KeyMap[ImGuiKey_C] = ALLEGRO_KEY_C;
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io.KeyMap[ImGuiKey_V] = ALLEGRO_KEY_V;
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io.KeyMap[ImGuiKey_X] = ALLEGRO_KEY_X;
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io.KeyMap[ImGuiKey_Y] = ALLEGRO_KEY_Y;
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io.KeyMap[ImGuiKey_Z] = ALLEGRO_KEY_Z;
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io.RenderDrawListsFn = ImGui_ImplA5_RenderDrawLists;
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#ifdef _WIN32
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io.ImeWindowHandle = al_get_win_window_handle(disp);
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#endif
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return true;
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}
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void ImGui_ImplA5_Shutdown()
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{
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ImGui_ImplA5_InvalidateDeviceObjects();
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ImGui::Shutdown();
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}
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void ImGui_ImplA5_ProcessEvent(ALLEGRO_EVENT *ev)
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{
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ImGuiIO &io = ImGui::GetIO();
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switch (ev->type) {
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case ALLEGRO_EVENT_MOUSE_AXES:
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io.MouseWheel += ev->mouse.dz;
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break;
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case ALLEGRO_EVENT_KEY_CHAR:
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if (ev->keyboard.display == g_disp) {
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io.KeysDown[ev->keyboard.keycode] = true;
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if (ev->keyboard.unichar > 0 && ev->keyboard.unichar < 0x10000)
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io.AddInputCharacter((unsigned short)ev->keyboard.unichar);
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}
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break;
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case ALLEGRO_EVENT_KEY_UP:
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if (ev->keyboard.display == g_disp)
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io.KeysDown[ev->keyboard.keycode] = false;
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break;
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default:
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break;
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}
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}
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void ImGui_ImplA5_NewFrame()
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{
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if (!g_img) Imgui_ImplA5_CreateDeviceObjects();
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ImGuiIO &io = ImGui::GetIO();
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int w, h;
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w = al_get_display_width(g_disp);
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h = al_get_display_height(g_disp);
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io.DisplaySize = ImVec2((float)w, (float)h);
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double current_time = al_get_time();
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io.DeltaTime = g_time > 0.0 ? (float)(current_time - g_time) : (float)(1.0f/60.0f);
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g_time = current_time;
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ALLEGRO_KEYBOARD_STATE keys;
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al_get_keyboard_state(&keys);
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io.KeyCtrl = al_key_down(&keys, ALLEGRO_KEYMOD_CTRL);
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io.KeyShift = al_key_down(&keys, ALLEGRO_KEYMOD_SHIFT);
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io.KeyAlt = al_key_down(&keys, ALLEGRO_KEYMOD_ALT);
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ALLEGRO_MOUSE_STATE mouse;
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if (keys.display == g_disp) {
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al_get_mouse_state(&mouse);
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io.MousePos = ImVec2((float)mouse.x, (float)mouse.y);
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}
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else {
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io.MousePos = ImVec2(-1, -1);
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}
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al_get_mouse_state(&mouse);
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io.MouseDown[0] = mouse.buttons & 1;
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io.MouseDown[1] = mouse.buttons & 2;
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io.MouseDown[2] = mouse.buttons & 3;
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ImGui::NewFrame();
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}
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// public domain
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#pragma once
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struct ALLEGRO_DISPLAY;
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union ALLEGRO_EVENT;
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bool ImGui_ImplA5_Init(ALLEGRO_DISPLAY *disp);
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void ImGui_ImplA5_ProcessEvent(ALLEGRO_EVENT *ev);
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void ImGui_ImplA5_Shutdown();
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void ImGui_ImplA5_NewFrame();
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bool Imgui_ImplA5_CreateDeviceObjects();
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void ImGui_ImplA5_InvalidateDeviceObjects();
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// public domain
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#include <stdint.h>
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#include <allegro5/allegro.h>
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#include <allegro5/allegro_primitives.h>
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#include <imgui.h>
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#include "imgui_impl_a5.h"
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int main(int argc, char **argv)
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{
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ALLEGRO_DISPLAY *disp;
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ALLEGRO_EVENT_QUEUE *queue;
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al_init();
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al_install_keyboard();
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al_install_mouse();
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al_init_primitives_addon();
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//al_set_new_display_option(ALLEGRO_VSYNC, 1, ALLEGRO_DONTCARE);
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disp = al_create_display(1280, 800);
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queue = al_create_event_queue();
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al_register_event_source(queue, al_get_display_event_source(disp));
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al_register_event_source(queue, al_get_keyboard_event_source());
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al_register_event_source(queue, al_get_mouse_event_source());
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ImGui_ImplA5_Init(disp);
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bool show_test_window = true;
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bool show_another_window = false;
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ImVec4 clear_color = ImColor(114, 144, 154);
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bool running = true;
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while (running) {
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ALLEGRO_EVENT ev;
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while (al_get_next_event(queue, &ev)) {
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ImGui_ImplA5_ProcessEvent(&ev);
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if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE) running = false;
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}
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ImGui_ImplA5_NewFrame();
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{
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static float f;
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ImGui::Text("Hello, world!");
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ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
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ImGui::ColorEdit3("clear color", (float*)&clear_color);
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if (ImGui::Button("Test Window")) show_test_window ^= 1;
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if (ImGui::Button("Another Window")) show_another_window ^= 1;
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ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f/ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
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}
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if (show_another_window) {
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ImGui::SetNextWindowSize(ImVec2(200, 100), ImGuiSetCond_FirstUseEver);
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ImGui::Begin("Another Window", &show_another_window);
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ImGui::Text("Hello");
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ImGui::End();
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}
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if (show_test_window) {
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ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiSetCond_FirstUseEver);
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ImGui::ShowTestWindow(&show_test_window);
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}
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al_clear_to_color(al_map_rgba_f(clear_color.x, clear_color.y, clear_color.z, clear_color.w));
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ImGui::Render();
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al_flip_display();
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}
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ImGui_ImplA5_Shutdown();
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al_destroy_event_queue(queue);
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al_destroy_display(disp);
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return 0;
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}
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