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Backends: SDL2: Amend new API, all support for multiple gamepads. (#3884, #6559, #6890)

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features/potocpav-newer-lines-2
ocornut ago%!(EXTRA string=2 years)
parent f966da1f8f
commit d15e4100b8
3 changed files with 113 additions and 78 deletions
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  1. 173
      backends/imgui_impl_sdl2.cpp
  2. 7
      backends/imgui_impl_sdl2.h
  3. 7
      docs/CHANGELOG.txt

173
backends/imgui_impl_sdl2.cpp
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@ -21,7 +21,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2024-02-13: Inputs: Handle gamepad disconnection. Added ImGui_ImplSDL2_SelectGamepadAuto()/ImGui_ImplSDL2_SelectGamepadExplicit().
// 2024-02-13: Inputs: Handle gamepad disconnection. Added ImGui_ImplSDL2_SetGamepadModeAutoFirst(), ImGui_ImplSDL2_SetGamepadModeAutoAll(), ImGui_ImplSDL2_SetGamepadModeManual().
// 2023-10-05: Inputs: Added support for extra ImGuiKey values: F13 to F24 function keys, app back/forward keys.
// 2023-04-06: Inputs: Avoid calling SDL_StartTextInput()/SDL_StopTextInput() as they don't only pertain to IME. It's unclear exactly what their relation is to IME. (#6306)
// 2023-04-04: Inputs: Added support for io.AddMouseSourceEvent() to discriminate ImGuiMouseSource_Mouse/ImGuiMouseSource_TouchScreen. (#2702)
@ -102,6 +102,13 @@
#define SDL_HAS_VULKAN SDL_VERSION_ATLEAST(2,0,6)
// SDL Data
enum ImGui_ImplSDL2_GamepadMode
{
ImGui_ImplSDL2_GamepadMode_AutoFirst, // (Default) Use first available gamepad
ImGui_ImplSDL2_GamepadMode_AutoAll, // Use all available gamepad
ImGui_ImplSDL2_GamepadMode_Manual,
};
struct ImGui_ImplSDL2_Data
{
SDL_Window* Window;
@ -118,9 +125,9 @@ struct ImGui_ImplSDL2_Data
bool MouseCanUseGlobalState;
// Gamepad handling
SDL_GameController* Gamepad;
bool GamepadSelectAuto;
bool WantRefreshGamepads; // Refresh gamepad list
ImVector<SDL_GameController*> Gamepads;
ImGui_ImplSDL2_GamepadMode GamepadMode;
bool WantUpdateGamepadsList;
ImGui_ImplSDL2_Data() { memset((void*)this, 0, sizeof(*this)); }
};
@ -389,7 +396,7 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
case SDL_CONTROLLERDEVICEADDED:
case SDL_CONTROLLERDEVICEREMOVED:
{
bd->WantRefreshGamepads = true;
bd->WantUpdateGamepadsList = true;
return true;
}
}
@ -429,9 +436,8 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer)
io.SetPlatformImeDataFn = ImGui_ImplSDL2_SetPlatformImeData;
// Gamepad handling
bd->Gamepad = NULL;
bd->GamepadSelectAuto = true;
bd->WantRefreshGamepads = true;
bd->GamepadMode = ImGui_ImplSDL2_GamepadMode_AutoFirst;
bd->WantUpdateGamepadsList = true;
// Load mouse cursors
bd->MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
@ -520,6 +526,8 @@ bool ImGui_ImplSDL2_InitForOther(SDL_Window* window)
return ImGui_ImplSDL2_Init(window, nullptr);
}
static void ImGui_ImplSDL2_CloseGamepads();
void ImGui_ImplSDL2_Shutdown()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
@ -530,9 +538,7 @@ void ImGui_ImplSDL2_Shutdown()
SDL_free(bd->ClipboardTextData);
for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
SDL_FreeCursor(bd->MouseCursors[cursor_n]);
if (bd->Gamepad && bd->GamepadSelectAuto)
SDL_GameControllerClose(bd->Gamepad);
ImGui_ImplSDL2_CloseGamepads();
io.BackendPlatformName = nullptr;
io.BackendPlatformUserData = nullptr;
@ -540,24 +546,6 @@ void ImGui_ImplSDL2_Shutdown()
IM_DELETE(bd);
}
void ImGui_ImplSDL2_SelectGamepadAuto()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
if (bd->GamepadSelectAuto == false)
bd->Gamepad = NULL;
bd->GamepadSelectAuto = true;
bd->WantRefreshGamepads = true;
}
void ImGui_ImplSDL2_SelectGamepadExplicit(SDL_GameController* gamepad)
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
if (bd->GamepadSelectAuto == true && bd->Gamepad != NULL)
SDL_GameControllerClose(bd->Gamepad);
bd->Gamepad = gamepad;
bd->GamepadSelectAuto = false;
}
static void ImGui_ImplSDL2_UpdateMouseData()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
@ -615,30 +603,80 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
}
}
static void ImGui_ImplSDL2_CloseGamepads()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
if (bd->GamepadMode != ImGui_ImplSDL2_GamepadMode_Manual)
for (SDL_GameController* gamepad : bd->Gamepads)
SDL_GameControllerClose(gamepad);
bd->Gamepads.resize(0);
}
void ImGui_ImplSDL2_SetGamepadModeAutoFirst()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
ImGui_ImplSDL2_CloseGamepads();
bd->GamepadMode = ImGui_ImplSDL2_GamepadMode_AutoFirst;
bd->WantUpdateGamepadsList = true;
}
void ImGui_ImplSDL2_SetGamepadModeAutoAll()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
ImGui_ImplSDL2_CloseGamepads();
bd->GamepadMode = ImGui_ImplSDL2_GamepadMode_AutoAll;
bd->WantUpdateGamepadsList = true;
}
void ImGui_ImplSDL2_SetGamepadModeManual(struct _SDL_GameController** gamepads_array, int gamepads_count)
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
ImGui_ImplSDL2_CloseGamepads();
for (int n = 0; n < gamepads_count; n++)
bd->Gamepads.push_back(gamepads_array[n]);
bd->GamepadMode = ImGui_ImplSDL2_GamepadMode_Manual;
}
static void ImGui_ImplSDL2_UpdateGamepadButton(ImGui_ImplSDL2_Data* bd, ImGuiIO& io, ImGuiKey key, SDL_GameControllerButton button_no)
{
bool merged_value = false;
for (SDL_GameController* gamepad : bd->Gamepads)
merged_value |= SDL_GameControllerGetButton(gamepad, button_no) != 0;
io.AddKeyEvent(key, merged_value);
}
static void ImGui_ImplSDL2_UpdateGamepadAnalog(ImGui_ImplSDL2_Data* bd, ImGuiIO& io, ImGuiKey key, SDL_GameControllerAxis axis_no, float v0, float v1)
{
float merged_value = 0.0f;
for (SDL_GameController* gamepad : bd->Gamepads)
{
float vn = (float)(SDL_GameControllerGetAxis(gamepad, axis_no) - v0) / (float)(v1 - v0);
vn = (vn < 0.0f) ? 0.0f : (vn > 1.0f) ? 1.0f : vn;
if (merged_value < vn)
merged_value = vn;
}
io.AddKeyAnalogEvent(key, merged_value > 0.1f, merged_value);
}
static void ImGui_ImplSDL2_UpdateGamepads()
{
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
ImGuiIO& io = ImGui::GetIO();
// Select a new controller
if (bd->WantRefreshGamepads && bd->GamepadSelectAuto)
// Update list of controller(s) to use
if (bd->WantUpdateGamepadsList && bd->GamepadMode != ImGui_ImplSDL2_GamepadMode_Manual)
{
SDL_GameController* old_gamepad = bd->Gamepad;
SDL_GameController* new_gamepad = NULL;
ImGui_ImplSDL2_CloseGamepads();
int joystick_count = SDL_NumJoysticks();
for (int n = 0; n < joystick_count; n++)
if (SDL_IsGameController(n))
if (SDL_GameController* gamepad = SDL_GameControllerOpen(n))
{
new_gamepad = gamepad;
bd->Gamepads.push_back(gamepad);
if (bd->GamepadMode == ImGui_ImplSDL2_GamepadMode_AutoFirst)
break;
}
//IMGUI_DEBUG_LOG("ImGui_ImplSDL2_UpdateGamepads(): Gamepad change %p -> %p\n", old_gamepad, new_gamepad);
if (old_gamepad != NULL && new_gamepad != NULL)
SDL_GameControllerClose(old_gamepad);
bd->Gamepad = new_gamepad;
bd->WantRefreshGamepads = false;
bd->WantUpdateGamepadsList = false;
}
// FIXME: Technically feeding gamepad shouldn't depend on this now that they are regular inputs.
@ -647,41 +685,36 @@ static void ImGui_ImplSDL2_UpdateGamepads()
// Get gamepad
io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
if (bd->Gamepad == NULL)
if (bd->Gamepads.Size == 0)
return;
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
// Update gamepad inputs
#define IM_SATURATE(V) (V < 0.0f ? 0.0f : V > 1.0f ? 1.0f : V)
#define MAP_BUTTON(KEY_NO, BUTTON_NO) { io.AddKeyEvent(KEY_NO, SDL_GameControllerGetButton(bd->Gamepad, BUTTON_NO) != 0); }
#define MAP_ANALOG(KEY_NO, AXIS_NO, V0, V1) { float vn = (float)(SDL_GameControllerGetAxis(bd->Gamepad, AXIS_NO) - V0) / (float)(V1 - V0); vn = IM_SATURATE(vn); io.AddKeyAnalogEvent(KEY_NO, vn > 0.1f, vn); }
const int thumb_dead_zone = 8000; // SDL_gamecontroller.h suggests using this value.
MAP_BUTTON(ImGuiKey_GamepadStart, SDL_CONTROLLER_BUTTON_START);
MAP_BUTTON(ImGuiKey_GamepadBack, SDL_CONTROLLER_BUTTON_BACK);
MAP_BUTTON(ImGuiKey_GamepadFaceLeft, SDL_CONTROLLER_BUTTON_X); // Xbox X, PS Square
MAP_BUTTON(ImGuiKey_GamepadFaceRight, SDL_CONTROLLER_BUTTON_B); // Xbox B, PS Circle
MAP_BUTTON(ImGuiKey_GamepadFaceUp, SDL_CONTROLLER_BUTTON_Y); // Xbox Y, PS Triangle
MAP_BUTTON(ImGuiKey_GamepadFaceDown, SDL_CONTROLLER_BUTTON_A); // Xbox A, PS Cross
MAP_BUTTON(ImGuiKey_GamepadDpadLeft, SDL_CONTROLLER_BUTTON_DPAD_LEFT);
MAP_BUTTON(ImGuiKey_GamepadDpadRight, SDL_CONTROLLER_BUTTON_DPAD_RIGHT);
MAP_BUTTON(ImGuiKey_GamepadDpadUp, SDL_CONTROLLER_BUTTON_DPAD_UP);
MAP_BUTTON(ImGuiKey_GamepadDpadDown, SDL_CONTROLLER_BUTTON_DPAD_DOWN);
MAP_BUTTON(ImGuiKey_GamepadL1, SDL_CONTROLLER_BUTTON_LEFTSHOULDER);
MAP_BUTTON(ImGuiKey_GamepadR1, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);
MAP_ANALOG(ImGuiKey_GamepadL2, SDL_CONTROLLER_AXIS_TRIGGERLEFT, 0.0f, 32767);
MAP_ANALOG(ImGuiKey_GamepadR2, SDL_CONTROLLER_AXIS_TRIGGERRIGHT, 0.0f, 32767);
MAP_BUTTON(ImGuiKey_GamepadL3, SDL_CONTROLLER_BUTTON_LEFTSTICK);
MAP_BUTTON(ImGuiKey_GamepadR3, SDL_CONTROLLER_BUTTON_RIGHTSTICK);
MAP_ANALOG(ImGuiKey_GamepadLStickLeft, SDL_CONTROLLER_AXIS_LEFTX, -thumb_dead_zone, -32768);
MAP_ANALOG(ImGuiKey_GamepadLStickRight, SDL_CONTROLLER_AXIS_LEFTX, +thumb_dead_zone, +32767);
MAP_ANALOG(ImGuiKey_GamepadLStickUp, SDL_CONTROLLER_AXIS_LEFTY, -thumb_dead_zone, -32768);
MAP_ANALOG(ImGuiKey_GamepadLStickDown, SDL_CONTROLLER_AXIS_LEFTY, +thumb_dead_zone, +32767);
MAP_ANALOG(ImGuiKey_GamepadRStickLeft, SDL_CONTROLLER_AXIS_RIGHTX, -thumb_dead_zone, -32768);
MAP_ANALOG(ImGuiKey_GamepadRStickRight, SDL_CONTROLLER_AXIS_RIGHTX, +thumb_dead_zone, +32767);
MAP_ANALOG(ImGuiKey_GamepadRStickUp, SDL_CONTROLLER_AXIS_RIGHTY, -thumb_dead_zone, -32768);
MAP_ANALOG(ImGuiKey_GamepadRStickDown, SDL_CONTROLLER_AXIS_RIGHTY, +thumb_dead_zone, +32767);
#undef MAP_BUTTON
#undef MAP_ANALOG
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadStart, SDL_CONTROLLER_BUTTON_START);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadBack, SDL_CONTROLLER_BUTTON_BACK);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadFaceLeft, SDL_CONTROLLER_BUTTON_X); // Xbox X, PS Square
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadFaceRight, SDL_CONTROLLER_BUTTON_B); // Xbox B, PS Circle
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadFaceUp, SDL_CONTROLLER_BUTTON_Y); // Xbox Y, PS Triangle
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadFaceDown, SDL_CONTROLLER_BUTTON_A); // Xbox A, PS Cross
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadDpadLeft, SDL_CONTROLLER_BUTTON_DPAD_LEFT);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadDpadRight, SDL_CONTROLLER_BUTTON_DPAD_RIGHT);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadDpadUp, SDL_CONTROLLER_BUTTON_DPAD_UP);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadDpadDown, SDL_CONTROLLER_BUTTON_DPAD_DOWN);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadL1, SDL_CONTROLLER_BUTTON_LEFTSHOULDER);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadR1, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadL2, SDL_CONTROLLER_AXIS_TRIGGERLEFT, 0.0f, 32767);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadR2, SDL_CONTROLLER_AXIS_TRIGGERRIGHT, 0.0f, 32767);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadL3, SDL_CONTROLLER_BUTTON_LEFTSTICK);
ImGui_ImplSDL2_UpdateGamepadButton(bd, io, ImGuiKey_GamepadR3, SDL_CONTROLLER_BUTTON_RIGHTSTICK);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadLStickLeft, SDL_CONTROLLER_AXIS_LEFTX, -thumb_dead_zone, -32768);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadLStickRight, SDL_CONTROLLER_AXIS_LEFTX, +thumb_dead_zone, +32767);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadLStickUp, SDL_CONTROLLER_AXIS_LEFTY, -thumb_dead_zone, -32768);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadLStickDown, SDL_CONTROLLER_AXIS_LEFTY, +thumb_dead_zone, +32767);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadRStickLeft, SDL_CONTROLLER_AXIS_RIGHTX, -thumb_dead_zone, -32768);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadRStickRight, SDL_CONTROLLER_AXIS_RIGHTX, +thumb_dead_zone, +32767);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadRStickUp, SDL_CONTROLLER_AXIS_RIGHTY, -thumb_dead_zone, -32768);
ImGui_ImplSDL2_UpdateGamepadAnalog(bd, io, ImGuiKey_GamepadRStickDown, SDL_CONTROLLER_AXIS_RIGHTY, +thumb_dead_zone, +32767);
}
void ImGui_ImplSDL2_NewFrame()

7
backends/imgui_impl_sdl2.h
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@ -38,9 +38,10 @@ IMGUI_IMPL_API void ImGui_ImplSDL2_NewFrame();
IMGUI_IMPL_API bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event);
// Gamepad selection automatically starts in Auto mode, picking first available SDL_GameController. You may override this.
// When using Explicit selection, caller is responsible for opening/closing gamepad.
IMGUI_IMPL_API void ImGui_ImplSDL2_SelectGamepadAuto();
IMGUI_IMPL_API void ImGui_ImplSDL2_SelectGamepadExplicit(struct _SDL_GameController* gamepad);
// When using manual mode, caller is responsible for opening/closing gamepad.
IMGUI_IMPL_API void ImGui_ImplSDL2_SetGamepadModeAutoFirst(); // Use first available gamepad (default)
IMGUI_IMPL_API void ImGui_ImplSDL2_SetGamepadModeAutoAll();
IMGUI_IMPL_API void ImGui_ImplSDL2_SetGamepadModeManual(struct _SDL_GameController** gamepads_array, int gamepads_count);
#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
static inline void ImGui_ImplSDL2_NewFrame(SDL_Window*) { ImGui_ImplSDL2_NewFrame(); } // 1.84: removed unnecessary parameter

7
docs/CHANGELOG.txt
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@ -51,9 +51,10 @@ Other changes:
- Menus, Popups: fixed menus and popups with child window flag erroneously not displaying
a scrollbar when contents is over parent viewport size. (#7287, #7063) [@ZingBallyhoo]
- Backends: SDL2: Handle gamepad disconnection + fixed increasing gamepad reference counter
continuously. Added ImGui_ImplSDL2_SelectGamepadAuto()/ImGui_ImplSDL2_SelectGamepadExplicit()
functions to respectively select automatic selection or provide a gamepad to use.
(#3884, #6559, #6890) [@lethal-guitar, @wn2000, @ocornut, @bog-dan-ro]
continuously. Added support for multiple simultaneous gamepads.
Added ImGui_ImplSDL2_SetGamepadModeXXX() functions to select whether to automatically pick
first available gamepad, all gamepads, or specific gamepads.
(#3884, #6559, #6890) [@ocornut, @lethal-guitar, @wn2000, @bog-dan-ro]
- Backends: SDLRenderer3: query newly added SDL_RenderViewportSet() to not restore
a wrong viewport if none was initially set.
- Backends: DirectX9: Using RGBA format when allowed by the driver to avoid CPU side

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