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+// dear imgui: Renderer + Platform Binding for Allegro 5
+// (Info: Allegro 5 is a cross-platform general purpose library for handling windows, inputs, graphics, etc.)
+
+// Implemented features:
+// [X] Renderer: User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+// [X] Platform: Clipboard support (from Allegro 5.1.12)
+// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+// Issues:
+// [ ] Renderer: The renderer is suboptimal as we need to unindex our buffers and convert vertices manually.
+// [ ] Platform: Missing gamepad support.
+
+// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
+// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
+// https://github.com/ocornut/imgui, Original Allegro 5 code by @birthggd
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+// 2018-06-13: Platform: Added clipboard support (from Allegro 5.1.12).
+// 2018-06-13: Renderer: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+// 2018-06-13: Renderer: Backup/restore transform and clipping rectangle.
+// 2018-06-11: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
+// 2018-04-18: Misc: Renamed file from imgui_impl_a5.cpp to imgui_impl_allegro5.cpp.
+// 2018-04-18: Misc: Added support for 32-bits vertex indices to avoid conversion at runtime. Added imconfig_allegro5.h to enforce 32-bit indices when included from imgui.h.
+// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplAllegro5_RenderDrawData() in the .h file so you can call it yourself.
+// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+// 2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
+
+#include <stdint.h> // uint64_t
+#include <cstring> // memcpy
+#include "imgui.h"
+#include "imgui_impl_allegro5.h"
+
+// Allegro
+#include <allegro5/allegro.h>
+#include <allegro5/allegro_primitives.h>
+#ifdef _WIN32
+#include <allegro5/allegro_windows.h>
+#endif
+#define ALLEGRO_HAS_CLIPBOARD (ALLEGRO_VERSION_INT >= ((5 << 24) | (1 << 16) | (12 << 8))) // Clipboard only supported from Allegro 5.1.12
+
+// Visual Studio warnings
+#ifdef _MSC_VER
+#pragma warning (disable: 4127) // condition expression is constant
+#endif
+
+// Data
+static ALLEGRO_DISPLAY* g_Display = NULL;
+static ALLEGRO_BITMAP* g_Texture = NULL;
+static double g_Time = 0.0;
+static ALLEGRO_MOUSE_CURSOR* g_MouseCursorInvisible = NULL;
+static ALLEGRO_VERTEX_DECL* g_VertexDecl = NULL;
+static char* g_ClipboardTextData = NULL;
+
+struct ImDrawVertAllegro
+{
+ ImVec2 pos;
+ ImVec2 uv;
+ ALLEGRO_COLOR col;
+};
+
+// Render function.
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
+void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
+{
+ // Backup Allegro state that will be modified
+ ALLEGRO_TRANSFORM last_transform = *al_get_current_transform();
+ ALLEGRO_TRANSFORM last_projection_transform = *al_get_current_projection_transform();
+ int last_clip_x, last_clip_y, last_clip_w, last_clip_h;
+ al_get_clipping_rectangle(&last_clip_x, &last_clip_y, &last_clip_w, &last_clip_h);
+ int last_blender_op, last_blender_src, last_blender_dst;
+ al_get_blender(&last_blender_op, &last_blender_src, &last_blender_dst);
+
+ // Setup render state
+ al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA);
+
+ // Setup orthographic projection matrix
+ // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right).
+ {
+ float L = draw_data->DisplayPos.x;
+ float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+ float T = draw_data->DisplayPos.y;
+ float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+ ALLEGRO_TRANSFORM transform;
+ al_identity_transform(&transform);
+ al_use_transform(&transform);
+ al_orthographic_transform(&transform, L, T, 1.0f, R, B, -1.0f);
+ al_use_projection_transform(&transform);
+ }
+
+ for (int n = 0; n < draw_data->CmdListsCount; n++)
+ {
+ const ImDrawList* cmd_list = draw_data->CmdLists[n];
+
+ // Allegro's implementation of al_draw_indexed_prim() for DX9 is completely broken. Unindex our buffers ourselves.
+ // FIXME-OPT: Unfortunately Allegro doesn't support 32-bits packed colors so we have to convert them to 4 float as well..
+ static ImVector<ImDrawVertAllegro> vertices;
+ vertices.resize(cmd_list->IdxBuffer.Size);
+ for (int i = 0; i < cmd_list->IdxBuffer.Size; i++)
+ {
+ const ImDrawVert* src_v = &cmd_list->VtxBuffer[cmd_list->IdxBuffer[i]];
+ ImDrawVertAllegro* dst_v = &vertices[i];
+ dst_v->pos = src_v->pos;
+ dst_v->uv = src_v->uv;
+ unsigned char* c = (unsigned char*)&src_v->col;
+ dst_v->col = al_map_rgba(c[0], c[1], c[2], c[3]);
+ }
+
+ const int* indices = NULL;
+ if (sizeof(ImDrawIdx) == 2)
+ {
+ // FIXME-OPT: Unfortunately Allegro doesn't support 16-bit indices.. You can '#define ImDrawIdx int' in imconfig.h to request Dear ImGui to output 32-bit indices.
+ // Otherwise, we convert them from 16-bit to 32-bit at runtime here, which works perfectly but is a little wasteful.
+ static ImVector<int> indices_converted;
+ indices_converted.resize(cmd_list->IdxBuffer.Size);
+ for (int i = 0; i < cmd_list->IdxBuffer.Size; ++i)
+ indices_converted[i] = (int)cmd_list->IdxBuffer.Data[i];
+ indices = indices_converted.Data;
+ }
+ else if (sizeof(ImDrawIdx) == 4)
+ {
+ indices = (const int*)cmd_list->IdxBuffer.Data;
+ }
+
+ int idx_offset = 0;
+ ImVec2 pos = draw_data->DisplayPos;
+ for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+ {
+ const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+ if (pcmd->UserCallback)
+ {
+ pcmd->UserCallback(cmd_list, pcmd);
+ }
+ else
+ {
+ ALLEGRO_BITMAP* texture = (ALLEGRO_BITMAP*)pcmd->TextureId;
+ al_set_clipping_rectangle(pcmd->ClipRect.x - pos.x, pcmd->ClipRect.y - pos.y, pcmd->ClipRect.z - pcmd->ClipRect.x, pcmd->ClipRect.w - pcmd->ClipRect.y);
+ al_draw_prim(&vertices[0], g_VertexDecl, texture, idx_offset, idx_offset + pcmd->ElemCount, ALLEGRO_PRIM_TRIANGLE_LIST);
+ }
+ idx_offset += pcmd->ElemCount;
+ }
+ }
+
+ // Restore modified Allegro state
+ al_set_blender(last_blender_op, last_blender_src, last_blender_dst);
+ al_set_clipping_rectangle(last_clip_x, last_clip_y, last_clip_w, last_clip_h);
+ al_use_transform(&last_transform);
+ al_use_projection_transform(&last_projection_transform);
+}
+
+bool ImGui_ImplAllegro5_CreateDeviceObjects()
+{
+ // Build texture atlas
+ ImGuiIO &io = ImGui::GetIO();
+ unsigned char *pixels;
+ int width, height;
+ io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
+
+ // Create texture
+ 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);
+ al_set_new_bitmap_flags(flags);
+ al_set_new_bitmap_format(fmt);
+ if (!img)
+ return false;
+
+ ALLEGRO_LOCKED_REGION *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;
+
+ // Store our identifier
+ io.Fonts->TexID = (void*)cloned_img;
+ g_Texture = cloned_img;
+
+ // Create an invisible mouse cursor
+ // Because al_hide_mouse_cursor() seems to mess up with the actual inputs..
+ ALLEGRO_BITMAP* mouse_cursor = al_create_bitmap(8,8);
+ g_MouseCursorInvisible = al_create_mouse_cursor(mouse_cursor, 0, 0);
+ al_destroy_bitmap(mouse_cursor);
+
+ return true;
+}
+
+void ImGui_ImplAllegro5_InvalidateDeviceObjects()
+{
+ if (g_Texture)
+ {
+ al_destroy_bitmap(g_Texture);
+ ImGui::GetIO().Fonts->TexID = NULL;
+ g_Texture = NULL;
+ }
+ if (g_MouseCursorInvisible)
+ {
+ al_destroy_mouse_cursor(g_MouseCursorInvisible);
+ g_MouseCursorInvisible = NULL;
+ }
+}
+
+#if ALLEGRO_HAS_CLIPBOARD
+static const char* ImGui_ImplAllegro5_GetClipboardText(void*)
+{
+ if (g_ClipboardTextData)
+ al_free(g_ClipboardTextData);
+ g_ClipboardTextData = al_get_clipboard_text(g_Display);
+ return g_ClipboardTextData;
+}
+
+static void ImGui_ImplAllegro5_SetClipboardText(void*, const char* text)
+{
+ al_set_clipboard_text(g_Display, text);
+}
+#endif
+
+bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
+{
+ g_Display = display;
+
+ // Setup back-end capabilities flags
+ ImGuiIO& io = ImGui::GetIO();
+ io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
+
+ // Create custom vertex declaration.
+ // Unfortunately Allegro doesn't support 32-bits packed colors so we have to convert them to 4 floats.
+ // We still use a custom declaration to use 'ALLEGRO_PRIM_TEX_COORD' instead of 'ALLEGRO_PRIM_TEX_COORD_PIXEL' else we can't do a reliable conversion.
+ ALLEGRO_VERTEX_ELEMENT elems[] =
+ {
+ { ALLEGRO_PRIM_POSITION, ALLEGRO_PRIM_FLOAT_2, IM_OFFSETOF(ImDrawVertAllegro, pos) },
+ { ALLEGRO_PRIM_TEX_COORD, ALLEGRO_PRIM_FLOAT_2, IM_OFFSETOF(ImDrawVertAllegro, uv) },
+ { ALLEGRO_PRIM_COLOR_ATTR, 0, IM_OFFSETOF(ImDrawVertAllegro, col) },
+ { 0, 0, 0 }
+ };
+ g_VertexDecl = al_create_vertex_decl(elems, sizeof(ImDrawVertAllegro));
+
+ 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_PageUp] = ALLEGRO_KEY_PGUP;
+ io.KeyMap[ImGuiKey_PageDown] = ALLEGRO_KEY_PGDN;
+ io.KeyMap[ImGuiKey_Home] = ALLEGRO_KEY_HOME;
+ io.KeyMap[ImGuiKey_End] = ALLEGRO_KEY_END;
+ io.KeyMap[ImGuiKey_Insert] = ALLEGRO_KEY_INSERT;
+ io.KeyMap[ImGuiKey_Delete] = ALLEGRO_KEY_DELETE;
+ io.KeyMap[ImGuiKey_Backspace] = ALLEGRO_KEY_BACKSPACE;
+ io.KeyMap[ImGuiKey_Space] = ALLEGRO_KEY_SPACE;
+ 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;
+
+#if ALLEGRO_HAS_CLIPBOARD
+ io.SetClipboardTextFn = ImGui_ImplAllegro5_SetClipboardText;
+ io.GetClipboardTextFn = ImGui_ImplAllegro5_GetClipboardText;
+ io.ClipboardUserData = NULL;
+#endif
+
+ return true;
+}
+
+void ImGui_ImplAllegro5_Shutdown()
+{
+ ImGui_ImplAllegro5_InvalidateDeviceObjects();
+ g_Display = NULL;
+
+ // Destroy last known clipboard data
+ if (g_ClipboardTextData)
+ al_free(g_ClipboardTextData);
+ g_ClipboardTextData = NULL;
+}
+
+// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
+// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
+// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
+// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
+bool ImGui_ImplAllegro5_ProcessEvent(ALLEGRO_EVENT *ev)
+{
+ ImGuiIO& io = ImGui::GetIO();
+
+ switch (ev->type)
+ {
+ case ALLEGRO_EVENT_MOUSE_AXES:
+ io.MouseWheel += ev->mouse.dz;
+ io.MouseWheelH += ev->mouse.dw;
+ return true;
+ case ALLEGRO_EVENT_KEY_CHAR:
+ if (ev->keyboard.display == g_Display)
+ if (ev->keyboard.unichar > 0 && ev->keyboard.unichar < 0x10000)
+ io.AddInputCharacter((unsigned short)ev->keyboard.unichar);
+ return true;
+ case ALLEGRO_EVENT_KEY_DOWN:
+ case ALLEGRO_EVENT_KEY_UP:
+ if (ev->keyboard.display == g_Display)
+ io.KeysDown[ev->keyboard.keycode] = (ev->type == ALLEGRO_EVENT_KEY_DOWN);
+ return true;
+ }
+ return false;
+}
+
+static void ImGui_ImplAllegro5_UpdateMouseCursor()
+{
+ ImGuiIO& io = ImGui::GetIO();
+ if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
+ return;
+
+ ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
+ if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None)
+ {
+ // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
+ al_set_mouse_cursor(g_Display, g_MouseCursorInvisible);
+ }
+ else
+ {
+ ALLEGRO_SYSTEM_MOUSE_CURSOR cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_DEFAULT;
+ switch (imgui_cursor)
+ {
+ case ImGuiMouseCursor_TextInput: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_EDIT; break;
+ case ImGuiMouseCursor_ResizeAll: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_MOVE; break;
+ case ImGuiMouseCursor_ResizeNS: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_N; break;
+ case ImGuiMouseCursor_ResizeEW: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_E; break;
+ case ImGuiMouseCursor_ResizeNESW: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NE; break;
+ case ImGuiMouseCursor_ResizeNWSE: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NW; break;
+ }
+ al_set_system_mouse_cursor(g_Display, cursor_id);
+ }
+}
+
+void ImGui_ImplAllegro5_NewFrame()
+{
+ if (!g_Texture)
+ ImGui_ImplAllegro5_CreateDeviceObjects();
+
+ ImGuiIO &io = ImGui::GetIO();
+
+ // Setup display size (every frame to accommodate for window resizing)
+ int w, h;
+ w = al_get_display_width(g_Display);
+ h = al_get_display_height(g_Display);
+ io.DisplaySize = ImVec2((float)w, (float)h);
+
+ // Setup time step
+ 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;
+
+ // Setup inputs
+ ALLEGRO_KEYBOARD_STATE keys;
+ al_get_keyboard_state(&keys);
+ io.KeyCtrl = al_key_down(&keys, ALLEGRO_KEY_LCTRL) || al_key_down(&keys, ALLEGRO_KEY_RCTRL);
+ io.KeyShift = al_key_down(&keys, ALLEGRO_KEY_LSHIFT) || al_key_down(&keys, ALLEGRO_KEY_RSHIFT);
+ io.KeyAlt = al_key_down(&keys, ALLEGRO_KEY_ALT) || al_key_down(&keys, ALLEGRO_KEY_ALTGR);
+ io.KeySuper = al_key_down(&keys, ALLEGRO_KEY_LWIN) || al_key_down(&keys, ALLEGRO_KEY_RWIN);
+
+ ALLEGRO_MOUSE_STATE mouse;
+ if (keys.display == g_Display)
+ {
+ al_get_mouse_state(&mouse);
+ io.MousePos = ImVec2((float)mouse.x, (float)mouse.y);
+ }
+ else
+ {
+ io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
+ }
+
+ al_get_mouse_state(&mouse);
+ io.MouseDown[0] = mouse.buttons & (1 << 0);
+ io.MouseDown[1] = mouse.buttons & (1 << 1);
+ io.MouseDown[2] = mouse.buttons & (1 << 2);
+
+ ImGui_ImplAllegro5_UpdateMouseCursor();
+}