From f4017a52d90567c2df482c5d553076dc706ac59b Mon Sep 17 00:00:00 2001
From: iamcheeseman <dev@iamcheeseman.net>
Date: Mon, 11 May 2026 14:30:48 -0400
Subject: Allow user input

---
 teensy/teensy.h          | 36 +++++++++++++++++++++++++++++-------
 teensy/teensy_context.c  | 23 +++++++++++++++++++++++
 teensy/teensy_context.h  |  8 ++++++++
 teensy/teensy_platform.h |  7 +++++++
 4 files changed, 67 insertions(+), 7 deletions(-)

(limited to 'teensy')

diff --git a/teensy/teensy.h b/teensy/teensy.h
index cf0479f..568430c 100644
--- a/teensy/teensy.h
+++ b/teensy/teensy.h
@@ -4,7 +4,6 @@
 #include <limits.h>
 
 #include "teensy_common.h"
-#include "teensy_context.h"
 #include "teensy_list.h"
 
 #define ty_vec2(x, y)     ((struct ty_vec2){x, y})
@@ -21,6 +20,30 @@
 #define TY_COLOR_CYAN    ty_color(0,   255, 255)
 #define TY_COLOR_WHITE   ty_color(255, 255, 255)
 
+// Virtual controller. Keyboard keys are also mapped to this.
+enum ty_button {
+    TY_BTN_LEFT_UP,    // D-pad #1 up
+    TY_BTN_LEFT_DOWN,  // D-pad #1 down
+    TY_BTN_LEFT_LEFT,  // D-pad #1 left
+    TY_BTN_LEFT_RIGHT, // D-pad #1 right
+
+    TY_BTN_RIGHT_UP,    // D-pad #2 up
+    TY_BTN_RIGHT_DOWN,  // D-pad #2 down
+    TY_BTN_RIGHT_LEFT,  // D-pad #2 left
+    TY_BTN_RIGHT_RIGHT, // D-pad #2 right
+
+    TY_BTN_ACTION_1,    // A
+    TY_BTN_ACTION_2,    // B
+    TY_BTN_ACTION_3,    // X
+    TY_BTN_ACTION_4,    // Y
+
+    // for use in the editor
+    TY_BTN_DB_CTRL,
+    TY_BTN_DB_SHIFT,
+
+    TY_BTN_COUNT,
+};
+
 struct ty_hints {
     int scr_width;
     int scr_height;
@@ -28,12 +51,6 @@ struct ty_hints {
     int ticrate;
 };
 
-struct ty_ctx {
-    struct ty_hints hints;
-    double ticrate;
-    double prev_tic_ts;
-};
-
 struct ty_color {
     uint8_t r;
     uint8_t g;
@@ -81,6 +98,11 @@ struct ty_renderer {
 void ty_init(struct ty_hints hints);
 void ty_deinit(void);
 
+// If the button is being held down
+bool ty_button_down(enum ty_button btn);
+// If the button was pressed just now
+bool ty_button_pressed(enum ty_button btn);
+
 // Whether or not the main loop should continue executing.
 bool ty_is_game_running(void);
 // Gets the real time that the game has been running.
diff --git a/teensy/teensy_context.c b/teensy/teensy_context.c
index 4a812dd..9dff405 100644
--- a/teensy/teensy_context.c
+++ b/teensy/teensy_context.c
@@ -35,6 +35,18 @@ void ty_deinit(void)
     ty_deinit_mem();
 }
 
+bool ty_button_down(enum ty_button btn)
+{
+    assert(btn >= 0 && btn < TY_BTN_COUNT);
+    return ctx.down[btn];
+}
+
+bool ty_button_pressed(enum ty_button btn)
+{
+    assert(btn >= 0 && btn < TY_BTN_COUNT);
+    return ctx.pressed[btn];
+}
+
 bool ty_is_game_running(void)
 {
     assert(is_init());
@@ -47,6 +59,16 @@ double ty_get_time(void)
     return ty_platform_get_time();
 }
 
+static
+void update_buttons(void)
+{
+    for (int btn = 0; btn < TY_BTN_COUNT; btn++) {
+        bool down = ty_platform_is_button_down(btn); 
+        ctx.pressed[btn] = down && !ctx.down[btn];
+        ctx.down[btn] = down;
+    }
+}
+
 int ty_tick(void)
 {
     assert(is_init());
@@ -56,6 +78,7 @@ int ty_tick(void)
 
     int tics = time_since_tic / ctx.ticrate;
     if (tics > 0) {
+        update_buttons();
         ctx.prev_tic_ts = current_time;
         ty_platform_frame(r.screen);
     }
diff --git a/teensy/teensy_context.h b/teensy/teensy_context.h
index 056a0c2..7223d3d 100644
--- a/teensy/teensy_context.h
+++ b/teensy/teensy_context.h
@@ -5,6 +5,14 @@
 #include "teensy_renderer.h"
 #include "teensy.h"
 
+struct ty_ctx {
+    struct ty_hints hints;
+    double ticrate;
+    double prev_tic_ts;
+    bool down[TY_BTN_COUNT];
+    bool pressed[TY_BTN_COUNT];
+};
+
 extern struct ty_ctx ctx;
 
 bool is_init(void);
diff --git a/teensy/teensy_platform.h b/teensy/teensy_platform.h
index 7733be1..2128c5e 100644
--- a/teensy/teensy_platform.h
+++ b/teensy/teensy_platform.h
@@ -1,6 +1,9 @@
 #ifndef TEENSY_PLATFORM_H_
 #define TEENSY_PLATFORM_H_
 
+#include "teensy.h"
+#include "teensy_context.h"
+
 // This platform functions are to be implemented by a platform library.
 
 void ty_platform_init(struct ty_ctx *ctx);
@@ -8,5 +11,9 @@ void ty_platform_deinit(void);
 void ty_platform_frame(struct ty_image img);
 bool ty_platform_os_wants_quit(void);
 double ty_platform_get_time(void);
+bool ty_platform_is_button_down(enum ty_button btn);
+
+// Optional, no editor if not implemented
+struct ty_vec2i ty_platform_get_mouse(void);
 
 #endif // TEENSY_PLATFORM_H_
-- 
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