GLFWGamepadLookup.ixx File

GLFW gamepad mapping helpers. More...

Included Headers

#include <GLFW/glfw3.h> #include <array> #include <bit> #include <helios.input.types.Gamepad>

Namespaces Index

namespace	helios
namespace	ext
	Platform-specific extensions and backend implementations. More...
namespace	glfw
	GLFW-specific implementations. More...
namespace	input
	GLFW input handling. More...
namespace	GLFWGamepadLookup

Description

GLFW gamepad mapping helpers.

File Listing

The file content with the documentation metadata removed is:

1/**

2 * @file GLFWGamepadLookup.ixx

3 * @brief GLFW gamepad mapping helpers.

4 */

5module;

6

7#include <GLFW/glfw3.h>

8#include <array>

9#include <bit>

10

11export module helios.ext.glfw.input.GLFWGamepadLookup;

12

13import helios.input.types.Gamepad;

14

15export namespace helios::ext::glfw::input::GLFWGamepadLookup {

16

17 /**

18 * @brief Internal method to safely compute an array index for the specified gamepadId,

19 * adhering to the logic arrayIndex = log_2(gamepadId)

20 *

21 * @param gamepadId The gamepadId for which the array index should be returned.

22 *

23 * @return the array index for the specified gamepadId.

24 */

25 constexpr unsigned int toArrayIndex(const helios::input::types::Gamepad gamepadId) noexcept {

26 return std::bit_width(static_cast<unsigned int>(gamepadId))-1;

27 }

28

29

30 /**

31 * @brief Provides a lookup for converting helios gamepad ids glfw-specific gamepad ids.

32 *

33 * @param gamepadId The helios gamepad id to map to the gamepad ids registered by GLFW

34 *

35 * @return A gamepad-id in glfw space.

36 */

37 inline int from(const helios::input::types::Gamepad gamepadId) noexcept {

38

39 static constexpr std::array<int, helios::input::types::Gamepad::size_> HELIOS_GAMEPAD_TO_GLFW=[] {

40 std::array<int, helios::input::types::Gamepad::size_> map{};

41

42 map[toArrayIndex(helios::input::types::Gamepad::ONE)] = GLFW_JOYSTICK_1;

43 map[toArrayIndex(helios::input::types::Gamepad::TWO)] = GLFW_JOYSTICK_2;

44 map[toArrayIndex(helios::input::types::Gamepad::THREE)] = GLFW_JOYSTICK_3;

45 map[toArrayIndex(helios::input::types::Gamepad::FOUR)] = GLFW_JOYSTICK_4;

46

47 return map;

48 }();

49

50 return HELIOS_GAMEPAD_TO_GLFW[toArrayIndex(gamepadId)];

51 }

52

53}

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