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Added support to use controllers via SDL_GameController. (#2509)

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Updated sdl examples to use SDL_INIT_GAMECONTROLLER flag
This commit is contained in:
David Amador 2019-04-22 13:34:34 +01:00 committed by omar
parent 16e9b8191b
commit 994a92d79d
4 changed files with 49 additions and 3 deletions
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2
examples/example_sdl_opengl2/main.cpp
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@ -16,7 +16,7 @@
int main(int, char**)
{
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER|SDL_INIT_GAMECONTROLLER) != 0)
{
printf("Error: %s\n", SDL_GetError());
return -1;

2
examples/example_sdl_opengl3/main.cpp
View File

@ -25,7 +25,7 @@
int main(int, char**)
{
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER|SDL_INIT_GAMECONTROLLER) != 0)
{
printf("Error: %s\n", SDL_GetError());
return -1;

2
examples/example_sdl_vulkan/main.cpp
View File

@ -319,7 +319,7 @@ static void FramePresent(ImGui_ImplVulkanH_Window* wd)
int main(int, char**)
{
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER|SDL_INIT_GAMECONTROLLER) != 0)
{
printf("Error: %s\n", SDL_GetError());
return 1;

46
examples/imgui_impl_sdl.cpp
View File

@ -266,6 +266,49 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
}
}
static void ImGui_ImplSDL2_UpdateGamepads()
{
ImGuiIO& io = ImGui::GetIO();
memset(io.NavInputs, 0, sizeof(io.NavInputs));
if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
return;
// Update gamepad inputs
#define MAP_BUTTON(NAV_NO, BUTTON_NO) { io.NavInputs[NAV_NO] = (SDL_GameControllerGetButton(game_controller, BUTTON_NO) == 1) ? 1.0f : 0.0f; }
#define MAP_ANALOG(NAV_NO, AXIS_NO, V0, V1) { float vn = (float)(SDL_GameControllerGetAxis(game_controller, AXIS_NO) - V0) / (float)(V1 - V0); if (vn > 1.0f) vn = 1.0f; if (vn > 0.0f && io.NavInputs[NAV_NO] < vn) io.NavInputs[NAV_NO] = vn; }
int axes_count = 0, buttons_count = 0;
SDL_GameController* game_controller = SDL_GameControllerOpen(0);
if(game_controller !=NULL)
{
const int thumb_dead_zone = 8000;
MAP_BUTTON(ImGuiNavInput_Activate, SDL_CONTROLLER_BUTTON_A); // Cross / A
MAP_BUTTON(ImGuiNavInput_Cancel, SDL_CONTROLLER_BUTTON_B); // Circle / B
MAP_BUTTON(ImGuiNavInput_Menu, SDL_CONTROLLER_BUTTON_X); // Square / X
MAP_BUTTON(ImGuiNavInput_Input, SDL_CONTROLLER_BUTTON_Y); // Triangle / Y
MAP_BUTTON(ImGuiNavInput_DpadLeft, SDL_CONTROLLER_BUTTON_DPAD_LEFT); // D-Pad Left
MAP_BUTTON(ImGuiNavInput_DpadRight, SDL_CONTROLLER_BUTTON_DPAD_RIGHT); // D-Pad Right
MAP_BUTTON(ImGuiNavInput_DpadUp, SDL_CONTROLLER_BUTTON_DPAD_UP); // D-Pad Up
MAP_BUTTON(ImGuiNavInput_DpadDown, SDL_CONTROLLER_BUTTON_DPAD_DOWN); // D-Pad Down
MAP_BUTTON(ImGuiNavInput_FocusPrev, SDL_CONTROLLER_BUTTON_LEFTSHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_FocusNext, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER); // R1 / RB
MAP_BUTTON(ImGuiNavInput_TweakSlow, SDL_CONTROLLER_BUTTON_LEFTSHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_TweakFast, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER); // R1 / RB
MAP_ANALOG(ImGuiNavInput_LStickLeft, SDL_CONTROLLER_AXIS_LEFTX, -thumb_dead_zone, -32768);
MAP_ANALOG(ImGuiNavInput_LStickRight, SDL_CONTROLLER_AXIS_LEFTX, +thumb_dead_zone, +32767);
MAP_ANALOG(ImGuiNavInput_LStickUp, SDL_CONTROLLER_AXIS_LEFTY, -thumb_dead_zone, -32767);
MAP_ANALOG(ImGuiNavInput_LStickDown, SDL_CONTROLLER_AXIS_LEFTY, +thumb_dead_zone, +32767);
#undef MAP_BUTTON
#undef MAP_ANALOG
}
if (axes_count > 0 && buttons_count > 0)
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
else
io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
}
void ImGui_ImplSDL2_NewFrame(SDL_Window* window)
{
ImGuiIO& io = ImGui::GetIO();
@ -288,4 +331,7 @@ void ImGui_ImplSDL2_NewFrame(SDL_Window* window)
ImGui_ImplSDL2_UpdateMousePosAndButtons();
ImGui_ImplSDL2_UpdateMouseCursor();
// Gamepad navigation mapping
ImGui_ImplSDL2_UpdateGamepads();
}