Purpose

Provide simple event based input functionality.

Interface

void add_key_listener(SDL_Scancode negative, SDL_Scancode positive, input_axis_fn delegate)

Attach an event callback to the stated axis. Pass 0 to negative and a desired button to positive to attach a single key listener. delegate will be called every time either negative or positive changes.

void add_mouse_listener(input_mouse_fn delegate)

Attach an event callback for whenever the mouse changes. delegate will be called every frame that the mouse position changes.

void add_scroll_listener(input_scroll_fn delegate)

Add an event callback for whenever the scroll wheel is moved. delegate will be called for every frame that the scrollwheel is moved.

void mouse_screen_position(float* ox, float* oy)

Fills ox and oy with the horizontal and vertical mouse position in screen space. (0,0) in the top left, (1,1) in the bottom right.

void mouse_world_position(float* ox, float* oy)

Fills ox and oy with the horizontal and vertical mouse position in world space according to the g_active_view.

int input_get_keydown(SDL_Scancode scancode)

returns: 1 if the key identified by scancode is down.

int input_get_mousedown(int mousebtn)

returns: 1 if the mouse button of number mousebtn is down.

Definitions

input_axis_fn

void(*input_axis_fn)(int value) Callback type to be used by keyboard listeners. value will be -1 if negative is down, 1 if positive is pressed, or zero if both are up.

input_mouse_fn

void(*input_mouse_fn)(float dx, float dy) Callback type to be used by mouse movement listeners. dx is the horizontal delta. dy is the vertical delta.

input_button_fn

void(*input_button_fn)(int down) Callback type to be used by mouse button listeners. down will be 1 if the mouse button was pressed, or 0 if the mouse button was released.

input_scroll_fn

void(*input_scroll_fn)(float delta) Callback type to be used by mouse scroll listeners. delta will be the amount the scrollwheel moved.

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