mgl_touch_state.h

[詳解]

// SPDX-License-Identifier: Zlib
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
 
#ifndef INCGUARD_MGL_TOUCH_STATE_H_1613412992
#define INCGUARD_MGL_TOUCH_STATE_H_1613412992
 
#include <array>
 
#include <mgl/math/mgl_vector2.h>
 
namespace MGL::Input
{
constexpr size_t kMultiTouchCount = 5;
 
enum class TouchID : uint32_t
{
    Invalid = 0xFFFFFFFF    
};
 
constexpr TouchID operator++(TouchID &rhs) noexcept
{
    rhs = TouchID{static_cast<std::underlying_type_t<TouchID>>(rhs) + 1};
    if (rhs >= TouchID::Invalid)
    {
        rhs = TouchID{0};
    }
 
    return rhs;
}
 
constexpr TouchID operator++(TouchID &rhs, int) noexcept
{
    auto ret = rhs;
    rhs = TouchID{static_cast<std::underlying_type_t<TouchID>>(rhs) + 1};
    if (rhs >= TouchID::Invalid)
    {
        rhs = TouchID{0};
    }
 
    return ret;
}
 
 
struct TouchState
{
    bool isEnabled{false};                
    uint64_t deviceID{0};                 
    TouchID touchID{TouchID::Invalid};    
    uint32_t touchFrameCount{0};          
    Vector2 position;                     
    Vector2 prevPosition;                 
    Vector2 deltaMove;                    
    Vector2 uvPosition;                   
    Vector2 uvPrevPosition;               
    Vector2 uvDeltaMove;                  
 
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    void Update(const TouchState &newState) noexcept
    {
        isEnabled = newState.isEnabled;
 
        if (isEnabled)
        {
            deviceID = newState.deviceID;
            touchID = newState.touchID;
            touchFrameCount++;
            prevPosition = position;
            position = newState.position;
            deltaMove = position - prevPosition;
            uvPrevPosition = uvPosition;
            uvPosition = newState.uvPosition;
            uvDeltaMove = uvPosition - uvPrevPosition;
        }
        else
        {
            *this = TouchState();
        }
    }
};
 
using TouchStateArray = std::array<TouchState, kMultiTouchCount>;
 
}    // namespace MGL::Input
 
#endif    // INCGUARD_MGL_TOUCH_STATE_H_1613412992
 
// vim: et ts=4 sw=4 sts=4