twn_input: singleton rework, twn_control.h and fixes

src/twn_input_c.h

@@ -1,5 +1,5 @@
-#ifndef INPUT_INTERNAL_API_H
-#define INPUT_INTERNAL_API_H
+#ifndef TWN_INPUT_C_H
+#define TWN_INPUT_C_H
 
 #include "twn_input.h"
 #include "twn_vec.h"
@@ -15,6 +15,15 @@ union ButtonCode {
 };
 
 
+typedef enum ButtonSource {
+    BUTTON_SOURCE_NOT_SET,
+    BUTTON_SOURCE_KEYBOARD_PHYSICAL,
+    BUTTON_SOURCE_KEYBOARD_CHARACTER,
+    BUTTON_SOURCE_GAMEPAD,
+    BUTTON_SOURCE_MOUSE,
+} ButtonSource;
+
+
 /* an input to which an action is bound */
 /* it is not limited to literal buttons */
 typedef struct Button {
@@ -23,6 +32,45 @@ typedef struct Button {
 } Button;
 
 
+/* represents the collective state of a group of buttons */
+/* that is, changes in the states of any of the bound buttons will affect it */
+typedef struct Action {
+    size_t num_bindings;
+
+    /* if you bind more than the number set in the configuration file */
+    /* it forgets the first Button to add the new one at the end */
+    Button *bindings;
+
+    Vec2 position;        /* set if applicable, e.g. mouse click */
+    bool is_pressed;
+    bool just_changed;
+} Action;
+
+
+typedef struct ActionHashItem {
+    char *key;
+    Action value;
+} ActionHashItem;
+
+
+typedef struct InputState {
+    const uint8_t *keyboard_state; /* array of booleans indexed by scancode */
+    ActionHashItem *action_hash;
+    Vec2i mouse_window_position;
+    Vec2i mouse_relative_position;
+    uint32_t mouse_state;          /* SDL mouse button bitmask */
+    ButtonSource last_active_source;
+    bool is_anything_just_pressed;
+    bool mouse_captured;
+} InputState;
+
+
+void input_state_init(InputState *input);
+
+void input_state_deinit(InputState *input);
+
+void input_state_update(InputState *input);
+
 void input_reset_state(InputState *input);
 
 #endif