vg/vg_input.h

   1 // Copyright (C) 2021 Harry Godden (hgn) - All Rights Reserved
   2
   3 static inline float vg_get_axis( const char *axis ) __attribute__((unused));
   4 static inline int vg_get_button( const char *button ) __attribute__((unused));
   5 static inline int vg_get_button_down( const char *button ) __attribute__((unused));
   6 static inline int vg_get_button_up( const char *button ) __attribute__((unused));
   7
   8 enum vg_button_state
   9 {
  10         k_button_state_down = 1,
  11         k_button_state_up = 3,
  12         k_button_state_pressed = 2,
  13         k_button_state_none = 0
  14 };
  15
  16 // Input
  17 // ===========================================================================================================
  18 GLFWgamepadstate vg_gamepad;
  19 int                     vg_gamepad_ready = 0;
  20 const char *vg_gamepad_name = NULL;
  21 int                     vg_gamepad_id;
  22
  23 enum EInputMode
  24 {
  25         k_EInputMode_pc,
  26         k_EInputMode_gamepad
  27 }
  28 vg_input_mode;
  29
  30 static struct axis_binding
  31 {
  32         const char *name;
  33         union
  34         {
  35                 int positive;
  36                 int bind;
  37         };
  38         int negative;
  39
  40         float value;
  41 }
  42 vg_axis_binds[];
  43
  44 static struct button_binding
  45 {
  46         const char *name;
  47         int bind;
  48
  49         int value; int prev;
  50 }
  51 vg_button_binds[];
  52
  53 #include "vg/config.h"
  54
  55 #pragma GCC diagnostic push
  56 #pragma GCC diagnostic ignored "-Wreturn-type"
  57
  58 static inline float vg_get_axis( const char *axis )
  59 {
  60         for( int i = 0; i < vg_list_size( vg_axis_binds ); i ++ )
  61         {
  62                 if( !strcmp( axis, vg_axis_binds[i].name ) )
  63                 {
  64                         return vg_axis_binds[i].value;
  65                 }
  66         }
  67 }
  68
  69 static inline struct button_binding *vg_get_button_ptr( const char *button )
  70 {
  71         for( int i = 0; i < vg_list_size( vg_button_binds ); i ++ )
  72         {
  73                 if( !strcmp( button, vg_button_binds[i].name ) )
  74                 {
  75                         return vg_button_binds + i;
  76                 }
  77         }
  78 }
  79 #pragma GCC diagnostic pop
  80
  81 static int vg_console_enabled(void);
  82
  83 static inline int vg_get_button( const char *button )
  84 {
  85         return vg_get_button_ptr( button )->value && !vg_console_enabled();
  86 }
  87
  88 static inline int vg_get_button_down( const char *button )
  89 {
  90         struct button_binding *bind = vg_get_button_ptr( button );
  91         return bind->value & (bind->value ^ bind->prev) && !vg_console_enabled();
  92 }
  93
  94 static inline int vg_get_button_up( const char *button )
  95 {
  96         struct button_binding *bind = vg_get_button_ptr( button );
  97         return bind->prev & (bind->value ^ bind->prev) && !vg_console_enabled();
  98 }
  99
 100 static inline enum vg_button_state vg_get_button_state( const char *button )
 101 {
 102         if( vg_get_button_down( button ) ) return k_button_state_down;
 103         if( vg_get_button_up( button ) ) return k_button_state_up;
 104         if( vg_get_button( button ) ) return k_button_state_pressed;
 105         return k_button_state_none;
 106 }
 107
 108 static inline int key_is_keyboard( int const id )
 109 {
 110         vg_static_assert( GLFW_MOUSE_BUTTON_LAST < GLFW_KEY_SPACE, "GLFW: Mouse has too many buttons" );
 111         return id > GLFW_MOUSE_BUTTON_LAST;
 112 }
 113
 114 // Mouse AND Keyboard get button press
 115 int get_button_cross_device( int const id )
 116 {
 117         if( key_is_keyboard( id ) )
 118         {
 119                 return glfwGetKey( vg_window, id );
 120         }
 121         else
 122         {
 123                 return glfwGetMouseButton( vg_window, id ) == GLFW_PRESS;
 124         }
 125 }
 126
 127 void vg_update_inputs(void)
 128 {
 129         // Update button inputs
 130         for( int i = 0; i < vg_list_size( vg_button_binds ); i ++ )
 131         {
 132                 struct button_binding *binding = vg_button_binds + i;
 133                 binding->prev = binding->value;
 134
 135                 if( vg_input_mode == k_EInputMode_pc )
 136                 {
 137                         binding->value = get_button_cross_device( binding->bind );
 138                 }
 139                 else
 140                 {
 141                         binding->value = vg_gamepad.buttons[ binding->bind ];
 142                 }
 143         }
 144
 145         // Update axis inputs
 146         for( int i = 0; i < vg_list_size( vg_axis_binds ); i ++ )
 147         {
 148                 struct axis_binding *binding = vg_axis_binds + i;
 149
 150                 if( vg_input_mode == k_EInputMode_pc )
 151                 {
 152                         binding->value  = get_button_cross_device( binding->positive );
 153                         binding->value -= get_button_cross_device( binding->negative );
 154                 }
 155                 else
 156                 {
 157                         binding->value = vg_gamepad.axes[ binding->bind ];
 158                 }
 159         }
 160 }