// dear imgui: Renderer + Platform Backend 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! // [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy ALLEGRO_KEY_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set] // [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 convert vertices manually. // [ ] Platform: Missing gamepad support. // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. // Read online: https://github.com/ocornut/imgui/tree/master/docs // CHANGELOG // (minor and older changes stripped away, please see git history for details) // 2022-11-30: Renderer: Restoring using al_draw_indexed_prim() when Allegro version is >= 5.2.5. // 2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11. // 2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported). // 2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion. // 2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+). // 2022-01-17: Inputs: always calling io.AddKeyModsEvent() next and before key event (not in NewFrame) to fix input queue with very low framerates. // 2022-01-10: Inputs: calling new io.AddKeyEvent(), io.AddKeyModsEvent() + io.SetKeyEventNativeData() API (1.87+). Support for full ImGuiKey range. // 2021-12-08: Renderer: Fixed mishandling of the the ImDrawCmd::IdxOffset field! This is an old bug but it never had an effect until some internal rendering changes in 1.86. // 2021-08-17: Calling io.AddFocusEvent() on ALLEGRO_EVENT_DISPLAY_SWITCH_OUT/ALLEGRO_EVENT_DISPLAY_SWITCH_IN events. // 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX). // 2021-05-19: Renderer: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement) // 2021-02-18: Change blending equation to preserve alpha in output buffer. // 2020-08-10: Inputs: Fixed horizontal mouse wheel direction. // 2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor. // 2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter. // 2019-05-11: Inputs: Don't filter character value from ALLEGRO_EVENT_KEY_CHAR before calling AddInputCharacter(). // 2019-04-30: Renderer: Added support for special ImDrawCallback_ResetRenderState callback to reset render state. // 2018-11-30: Platform: Added touchscreen support. // 2018-11-30: Misc: Setting up io.BackendPlatformName/io.BackendRendererName so they can be displayed in the About Window. // 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: Stopped using al_draw_indexed_prim() as it is buggy in Allegro's DX9 backend. // 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-bit 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 #define ALLEGRO_HAS_DRAW_INDEXED_PRIM (ALLEGRO_VERSION_INT >= ((5 << 24) | (2 << 16) | ( 5 << 8))) // DX9 implementation of al_draw_indexed_prim() got fixed in Allegro 5.2.5 // Visual Studio warnings #ifdef _MSC_VER #pragma warning (disable: 4127) // condition expression is constant #endif struct ImDrawVertAllegro { ImVec2 pos; ImVec2 uv; ALLEGRO_COLOR col; }; // FIXME-OPT: Unfortunately Allegro doesn't support 32-bit packed colors so we have to convert them to 4 float as well.. // FIXME-OPT: Consider inlining al_map_rgba()? // see https://github.com/liballeg/allegro5/blob/master/src/pixels.c#L554 // and https://github.com/liballeg/allegro5/blob/master/include/allegro5/internal/aintern_pixels.h #define DRAW_VERT_IMGUI_TO_ALLEGRO(DST, SRC) { (DST)->pos = (SRC)->pos; (DST)->uv = (SRC)->uv; unsigned char* c = (unsigned char*)&(SRC)->col; (DST)->col = al_map_rgba(c[0], c[1], c[2], c[3]); } // Allegro Data struct ImGui_ImplAllegro5_Data { ALLEGRO_DISPLAY* Display; ALLEGRO_BITMAP* Texture; double Time; ALLEGRO_MOUSE_CURSOR* MouseCursorInvisible; ALLEGRO_VERTEX_DECL* VertexDecl; char* ClipboardTextData; ImVector<ImDrawVertAllegro> BufVertices; ImVector<int> BufIndices; ImGui_ImplAllegro5_Data() { memset((void*)this, 0, sizeof(*this)); } }; // Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts. // FIXME: multi-context support is not well tested and probably dysfunctional in this backend. static ImGui_ImplAllegro5_Data* ImGui_ImplAllegro5_GetBackendData() { return ImGui::GetCurrentContext() ? (ImGui_ImplAllegro5_Data*)ImGui::GetIO().BackendPlatformUserData : nullptr; } static void ImGui_ImplAllegro5_SetupRenderState(ImDrawData* draw_data) { // Setup blending al_set_separate_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA, ALLEGRO_ADD, ALLEGRO_ONE, 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); } } // Render function. void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data) { // Avoid rendering when minimized if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f) return; // Backup Allegro state that will be modified ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); 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 desired render state ImGui_ImplAllegro5_SetupRenderState(draw_data); // Render command lists for (int n = 0; n < draw_data->CmdListsCount; n++) { const ImDrawList* cmd_list = draw_data->CmdLists[n]; ImVector<ImDrawVertAllegro>& vertices = bd->BufVertices; #if ALLEGRO_HAS_DRAW_INDEXED_PRIM vertices.resize(cmd_list->VtxBuffer.Size); for (int i = 0; i < cmd_list->VtxBuffer.Size; i++) { const ImDrawVert* src_v = &cmd_list->VtxBuffer[i]; ImDrawVertAllegro* dst_v = &vertices[i]; DRAW_VERT_IMGUI_TO_ALLEGRO(dst_v, src_v); } const int* indices = nullptr; if (sizeof(ImDrawIdx) == 2) { // FIXME-OPT: 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. bd->BufIndices.resize(cmd_list->IdxBuffer.Size); for (int i = 0; i < cmd_list->IdxBuffer.Size; ++i) bd->BufIndices[i] = (int)cmd_list->IdxBuffer.Data[i]; indices = bd->BufIndices.Data; } else if (sizeof(ImDrawIdx) == 4) { indices = (const int*)cmd_list->IdxBuffer.Data; } #else // Allegro's implementation of al_draw_indexed_prim() for DX9 was broken until 5.2.5. Unindex buffers ourselves while converting vertex format. 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]; DRAW_VERT_IMGUI_TO_ALLEGRO(dst_v, src_v); } #endif // Render command lists ImVec2 clip_off = 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) { // User callback, registered via ImDrawList::AddCallback() // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.) if (pcmd->UserCallback == ImDrawCallback_ResetRenderState) ImGui_ImplAllegro5_SetupRenderState(draw_data); else pcmd->UserCallback(cmd_list, pcmd); } else { // Project scissor/clipping rectangles into framebuffer space ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y); ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y); if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y) continue; // Apply scissor/clipping rectangle, Draw ALLEGRO_BITMAP* texture = (ALLEGRO_BITMAP*)pcmd->GetTexID(); al_set_clipping_rectangle(clip_min.x, clip_min.y, clip_max.x - clip_min.x, clip_max.y - clip_min.y); #if ALLEGRO_HAS_DRAW_INDEXED_PRIM al_draw_indexed_prim(&vertices[0], bd->VertexDecl, texture, &indices[pcmd->IdxOffset], pcmd->ElemCount, ALLEGRO_PRIM_TRIANGLE_LIST); #else al_draw_prim(&vertices[0], bd->VertexDecl, texture, pcmd->IdxOffset, pcmd->IdxOffset + pcmd->ElemCount, ALLEGRO_PRIM_TRIANGLE_LIST); #endif } } } // 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 ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); ImGuiIO& io = ImGui::GetIO(); unsigned char* pixels; int width, height; io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Create texture // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling) 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->SetTexID((ImTextureID)(intptr_t)cloned_img); bd->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); bd->MouseCursorInvisible = al_create_mouse_cursor(mouse_cursor, 0, 0); al_destroy_bitmap(mouse_cursor); return true; } void ImGui_ImplAllegro5_InvalidateDeviceObjects() { ImGuiIO& io = ImGui::GetIO(); ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); if (bd->Texture) { io.Fonts->SetTexID(nullptr); al_destroy_bitmap(bd->Texture); bd->Texture = nullptr; } if (bd->MouseCursorInvisible) { al_destroy_mouse_cursor(bd->MouseCursorInvisible); bd->MouseCursorInvisible = nullptr; } } #if ALLEGRO_HAS_CLIPBOARD static const char* ImGui_ImplAllegro5_GetClipboardText(void*) { ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); if (bd->ClipboardTextData) al_free(bd->ClipboardTextData); bd->ClipboardTextData = al_get_clipboard_text(bd->Display); return bd->ClipboardTextData; } static void ImGui_ImplAllegro5_SetClipboardText(void*, const char* text) { ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); al_set_clipboard_text(bd->Display, text); } #endif static ImGuiKey ImGui_ImplAllegro5_KeyCodeToImGuiKey(int key_code) { switch (key_code) { case ALLEGRO_KEY_TAB: return ImGuiKey_Tab; case ALLEGRO_KEY_LEFT: return ImGuiKey_LeftArrow; case ALLEGRO_KEY_RIGHT: return ImGuiKey_RightArrow; case ALLEGRO_KEY_UP: return ImGuiKey_UpArrow; case ALLEGRO_KEY_DOWN: return ImGuiKey_DownArrow; case ALLEGRO_KEY_PGUP: return ImGuiKey_PageUp; case ALLEGRO_KEY_PGDN: return ImGuiKey_PageDown; case ALLEGRO_KEY_HOME: return ImGuiKey_Home; case ALLEGRO_KEY_END: return ImGuiKey_End; case ALLEGRO_KEY_INSERT: return ImGuiKey_Insert; case ALLEGRO_KEY_DELETE: return ImGuiKey_Delete; case ALLEGRO_KEY_BACKSPACE: return ImGuiKey_Backspace; case ALLEGRO_KEY_SPACE: return ImGuiKey_Space; case ALLEGRO_KEY_ENTER: return ImGuiKey_Enter; case ALLEGRO_KEY_ESCAPE: return ImGuiKey_Escape; case ALLEGRO_KEY_QUOTE: return ImGuiKey_Apostrophe; case ALLEGRO_KEY_COMMA: return ImGuiKey_Comma; case ALLEGRO_KEY_MINUS: return ImGuiKey_Minus; case ALLEGRO_KEY_FULLSTOP: return ImGuiKey_Period; case ALLEGRO_KEY_SLASH: return ImGuiKey_Slash; case ALLEGRO_KEY_SEMICOLON: return ImGuiKey_Semicolon; case ALLEGRO_KEY_EQUALS: return ImGuiKey_Equal; case ALLEGRO_KEY_OPENBRACE: return ImGuiKey_LeftBracket; case ALLEGRO_KEY_BACKSLASH: return ImGuiKey_Backslash; case ALLEGRO_KEY_CLOSEBRACE: return ImGuiKey_RightBracket; case ALLEGRO_KEY_TILDE: return ImGuiKey_GraveAccent; case ALLEGRO_KEY_CAPSLOCK: return ImGuiKey_CapsLock; case ALLEGRO_KEY_SCROLLLOCK: return ImGuiKey_ScrollLock; case ALLEGRO_KEY_NUMLOCK: return ImGuiKey_NumLock; case ALLEGRO_KEY_PRINTSCREEN: return ImGuiKey_PrintScreen; case ALLEGRO_KEY_PAUSE: return ImGuiKey_Pause; case ALLEGRO_KEY_PAD_0: return ImGuiKey_Keypad0; case ALLEGRO_KEY_PAD_1: return ImGuiKey_Keypad1; case ALLEGRO_KEY_PAD_2: return ImGuiKey_Keypad2; case ALLEGRO_KEY_PAD_3: return ImGuiKey_Keypad3; case ALLEGRO_KEY_PAD_4: return ImGuiKey_Keypad4; case ALLEGRO_KEY_PAD_5: return ImGuiKey_Keypad5; case ALLEGRO_KEY_PAD_6: return ImGuiKey_Keypad6; case ALLEGRO_KEY_PAD_7: return ImGuiKey_Keypad7; case ALLEGRO_KEY_PAD_8: return ImGuiKey_Keypad8; case ALLEGRO_KEY_PAD_9: return ImGuiKey_Keypad9; case ALLEGRO_KEY_PAD_DELETE: return ImGuiKey_KeypadDecimal; case ALLEGRO_KEY_PAD_SLASH: return ImGuiKey_KeypadDivide; case ALLEGRO_KEY_PAD_ASTERISK: return ImGuiKey_KeypadMultiply; case ALLEGRO_KEY_PAD_MINUS: return ImGuiKey_KeypadSubtract; case ALLEGRO_KEY_PAD_PLUS: return ImGuiKey_KeypadAdd; case ALLEGRO_KEY_PAD_ENTER: return ImGuiKey_KeypadEnter; case ALLEGRO_KEY_PAD_EQUALS: return ImGuiKey_KeypadEqual; case ALLEGRO_KEY_LCTRL: return ImGuiKey_LeftCtrl; case ALLEGRO_KEY_LSHIFT: return ImGuiKey_LeftShift; case ALLEGRO_KEY_ALT: return ImGuiKey_LeftAlt; case ALLEGRO_KEY_LWIN: return ImGuiKey_LeftSuper; case ALLEGRO_KEY_RCTRL: return ImGuiKey_RightCtrl; case ALLEGRO_KEY_RSHIFT: return ImGuiKey_RightShift; case ALLEGRO_KEY_ALTGR: return ImGuiKey_RightAlt; case ALLEGRO_KEY_RWIN: return ImGuiKey_RightSuper; case ALLEGRO_KEY_MENU: return ImGuiKey_Menu; case ALLEGRO_KEY_0: return ImGuiKey_0; case ALLEGRO_KEY_1: return ImGuiKey_1; case ALLEGRO_KEY_2: return ImGuiKey_2; case ALLEGRO_KEY_3: return ImGuiKey_3; case ALLEGRO_KEY_4: return ImGuiKey_4; case ALLEGRO_KEY_5: return ImGuiKey_5; case ALLEGRO_KEY_6: return ImGuiKey_6; case ALLEGRO_KEY_7: return ImGuiKey_7; case ALLEGRO_KEY_8: return ImGuiKey_8; case ALLEGRO_KEY_9: return ImGuiKey_9; case ALLEGRO_KEY_A: return ImGuiKey_A; case ALLEGRO_KEY_B: return ImGuiKey_B; case ALLEGRO_KEY_C: return ImGuiKey_C; case ALLEGRO_KEY_D: return ImGuiKey_D; case ALLEGRO_KEY_E: return ImGuiKey_E; case ALLEGRO_KEY_F: return ImGuiKey_F; case ALLEGRO_KEY_G: return ImGuiKey_G; case ALLEGRO_KEY_H: return ImGuiKey_H; case ALLEGRO_KEY_I: return ImGuiKey_I; case ALLEGRO_KEY_J: return ImGuiKey_J; case ALLEGRO_KEY_K: return ImGuiKey_K; case ALLEGRO_KEY_L: return ImGuiKey_L; case ALLEGRO_KEY_M: return ImGuiKey_M; case ALLEGRO_KEY_N: return ImGuiKey_N; case ALLEGRO_KEY_O: return ImGuiKey_O; case ALLEGRO_KEY_P: return ImGuiKey_P; case ALLEGRO_KEY_Q: return ImGuiKey_Q; case ALLEGRO_KEY_R: return ImGuiKey_R; case ALLEGRO_KEY_S: return ImGuiKey_S; case ALLEGRO_KEY_T: return ImGuiKey_T; case ALLEGRO_KEY_U: return ImGuiKey_U; case ALLEGRO_KEY_V: return ImGuiKey_V; case ALLEGRO_KEY_W: return ImGuiKey_W; case ALLEGRO_KEY_X: return ImGuiKey_X; case ALLEGRO_KEY_Y: return ImGuiKey_Y; case ALLEGRO_KEY_Z: return ImGuiKey_Z; case ALLEGRO_KEY_F1: return ImGuiKey_F1; case ALLEGRO_KEY_F2: return ImGuiKey_F2; case ALLEGRO_KEY_F3: return ImGuiKey_F3; case ALLEGRO_KEY_F4: return ImGuiKey_F4; case ALLEGRO_KEY_F5: return ImGuiKey_F5; case ALLEGRO_KEY_F6: return ImGuiKey_F6; case ALLEGRO_KEY_F7: return ImGuiKey_F7; case ALLEGRO_KEY_F8: return ImGuiKey_F8; case ALLEGRO_KEY_F9: return ImGuiKey_F9; case ALLEGRO_KEY_F10: return ImGuiKey_F10; case ALLEGRO_KEY_F11: return ImGuiKey_F11; case ALLEGRO_KEY_F12: return ImGuiKey_F12; default: return ImGuiKey_None; } } bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display) { ImGuiIO& io = ImGui::GetIO(); IM_ASSERT(io.BackendPlatformUserData == nullptr && "Already initialized a platform backend!"); // Setup backend capabilities flags ImGui_ImplAllegro5_Data* bd = IM_NEW(ImGui_ImplAllegro5_Data)(); io.BackendPlatformUserData = (void*)bd; io.BackendPlatformName = io.BackendRendererName = "imgui_impl_allegro5"; io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional) bd->Display = display; // Create custom vertex declaration. // Unfortunately Allegro doesn't support 32-bit 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 } }; bd->VertexDecl = al_create_vertex_decl(elems, sizeof(ImDrawVertAllegro)); #if ALLEGRO_HAS_CLIPBOARD io.SetClipboardTextFn = ImGui_ImplAllegro5_SetClipboardText; io.GetClipboardTextFn = ImGui_ImplAllegro5_GetClipboardText; io.ClipboardUserData = nullptr; #endif return true; } void ImGui_ImplAllegro5_Shutdown() { ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?"); ImGuiIO& io = ImGui::GetIO(); ImGui_ImplAllegro5_InvalidateDeviceObjects(); if (bd->VertexDecl) al_destroy_vertex_decl(bd->VertexDecl); if (bd->ClipboardTextData) al_free(bd->ClipboardTextData); io.BackendPlatformUserData = nullptr; io.BackendPlatformName = io.BackendRendererName = nullptr; IM_DELETE(bd); } // ev->keyboard.modifiers seems always zero so using that... static void ImGui_ImplAllegro5_UpdateKeyModifiers() { ImGuiIO& io = ImGui::GetIO(); ALLEGRO_KEYBOARD_STATE keys; al_get_keyboard_state(&keys); io.AddKeyEvent(ImGuiMod_Ctrl, al_key_down(&keys, ALLEGRO_KEY_LCTRL) || al_key_down(&keys, ALLEGRO_KEY_RCTRL)); io.AddKeyEvent(ImGuiMod_Shift, al_key_down(&keys, ALLEGRO_KEY_LSHIFT) || al_key_down(&keys, ALLEGRO_KEY_RSHIFT)); io.AddKeyEvent(ImGuiMod_Alt, al_key_down(&keys, ALLEGRO_KEY_ALT) || al_key_down(&keys, ALLEGRO_KEY_ALTGR)); io.AddKeyEvent(ImGuiMod_Super, al_key_down(&keys, ALLEGRO_KEY_LWIN) || al_key_down(&keys, ALLEGRO_KEY_RWIN)); } // 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, or clear/overwrite your copy of the mouse data. // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data. // 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(); ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); switch (ev->type) { case ALLEGRO_EVENT_MOUSE_AXES: if (ev->mouse.display == bd->Display) { io.AddMousePosEvent(ev->mouse.x, ev->mouse.y); io.AddMouseWheelEvent(-ev->mouse.dw, ev->mouse.dz); } return true; case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN: case ALLEGRO_EVENT_MOUSE_BUTTON_UP: if (ev->mouse.display == bd->Display && ev->mouse.button > 0 && ev->mouse.button <= 5) io.AddMouseButtonEvent(ev->mouse.button - 1, ev->type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN); return true; case ALLEGRO_EVENT_TOUCH_MOVE: if (ev->touch.display == bd->Display) io.AddMousePosEvent(ev->touch.x, ev->touch.y); return true; case ALLEGRO_EVENT_TOUCH_BEGIN: case ALLEGRO_EVENT_TOUCH_END: case ALLEGRO_EVENT_TOUCH_CANCEL: if (ev->touch.display == bd->Display && ev->touch.primary) io.AddMouseButtonEvent(0, ev->type == ALLEGRO_EVENT_TOUCH_BEGIN); return true; case ALLEGRO_EVENT_MOUSE_LEAVE_DISPLAY: if (ev->mouse.display == bd->Display) io.AddMousePosEvent(-FLT_MAX, -FLT_MAX); return true; case ALLEGRO_EVENT_KEY_CHAR: if (ev->keyboard.display == bd->Display) if (ev->keyboard.unichar != 0) io.AddInputCharacter((unsigned int)ev->keyboard.unichar); return true; case ALLEGRO_EVENT_KEY_DOWN: case ALLEGRO_EVENT_KEY_UP: if (ev->keyboard.display == bd->Display) { ImGui_ImplAllegro5_UpdateKeyModifiers(); ImGuiKey key = ImGui_ImplAllegro5_KeyCodeToImGuiKey(ev->keyboard.keycode); io.AddKeyEvent(key, (ev->type == ALLEGRO_EVENT_KEY_DOWN)); io.SetKeyEventNativeData(key, ev->keyboard.keycode, -1); // To support legacy indexing (<1.87 user code) } return true; case ALLEGRO_EVENT_DISPLAY_SWITCH_OUT: if (ev->display.source == bd->Display) io.AddFocusEvent(false); return true; case ALLEGRO_EVENT_DISPLAY_SWITCH_IN: if (ev->display.source == bd->Display) { io.AddFocusEvent(true); #if defined(ALLEGRO_UNSTABLE) al_clear_keyboard_state(bd->Display); #endif } return true; } return false; } static void ImGui_ImplAllegro5_UpdateMouseCursor() { ImGuiIO& io = ImGui::GetIO(); if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) return; ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); 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(bd->Display, bd->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; case ImGuiMouseCursor_NotAllowed: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_UNAVAILABLE; break; } al_set_system_mouse_cursor(bd->Display, cursor_id); } } void ImGui_ImplAllegro5_NewFrame() { ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData(); IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplAllegro5_Init()?"); if (!bd->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(bd->Display); h = al_get_display_height(bd->Display); io.DisplaySize = ImVec2((float)w, (float)h); // Setup time step double current_time = al_get_time(); io.DeltaTime = bd->Time > 0.0 ? (float)(current_time - bd->Time) : (float)(1.0f / 60.0f); bd->Time = current_time; // Setup mouse cursor shape ImGui_ImplAllegro5_UpdateMouseCursor(); }