From 32897d35fa724e46e4195927d385da4e35ac7c76 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Thu, 8 Feb 2024 07:55:30 -0800
Subject: Add function to check for key press.

---
 gfx-app/include/gfx/gfx_app.h | 32 ++++++++++++++++++++++
 gfx-app/src/gfx_app.c         | 63 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)

diff --git a/gfx-app/include/gfx/gfx_app.h b/gfx-app/include/gfx/gfx_app.h
index 3c544fa..86c502a 100644
--- a/gfx-app/include/gfx/gfx_app.h
+++ b/gfx-app/include/gfx/gfx_app.h
@@ -28,12 +28,44 @@ typedef struct GfxAppCallbacks {
   GfxAppShutdown shutdown;
 } GfxAppCallbacks;
 
+typedef enum Key {
+  KeyA = 'a',
+  KeyB,
+  KeyC,
+  KeyD,
+  KeyE,
+  KeyF,
+  KeyG,
+  KeyH,
+  KeyI,
+  KeyJ,
+  KeyK,
+  KeyL,
+  KeyM,
+  KeyN,
+  KeyO,
+  KeyP,
+  KeyQ,
+  KeyR,
+  KeyS,
+  KeyT,
+  KeyU,
+  KeyV,
+  KeyW,
+  KeyX,
+  KeyY,
+  KeyZ,
+} Key;
+
 /// Create a window with an OpenGL context and run the main loop.
 bool gfx_app_run(const GfxAppDesc*, const GfxAppCallbacks*);
 
 /// Get the mouse coordinates relative to the app's window.
 void gfx_app_get_mouse_position(double* x, double* y);
 
+/// Return true if the given key is pressed.
+bool gfx_is_key_pressed(Key);
+
 /// Define a main function that initializes and puts the application in a loop.
 /// See also: gfx_app_run().
 #define GFX_APP_MAIN(WIDTH, HEIGHT, MAX_FPS)                                 \
diff --git a/gfx-app/src/gfx_app.c b/gfx-app/src/gfx_app.c
index a313ce8..e0211b1 100644
--- a/gfx-app/src/gfx_app.c
+++ b/gfx-app/src/gfx_app.c
@@ -138,3 +138,66 @@ cleanup:
 void gfx_app_get_mouse_position(double* x, double* y) {
   glfwGetCursorPos(g_gfx_app.window, x, y);
 }
+
+static int to_glfw_key(Key key);
+
+bool gfx_is_key_pressed(Key key) {
+  return glfwGetKey(g_gfx_app.window, to_glfw_key(key)) == GLFW_PRESS;
+}
+
+static int to_glfw_key(Key key) {
+  switch (key) {
+  case KeyA:
+    return GLFW_KEY_A;
+  case KeyB:
+    return GLFW_KEY_B;
+  case KeyC:
+    return GLFW_KEY_C;
+  case KeyD:
+    return GLFW_KEY_D;
+  case KeyE:
+    return GLFW_KEY_E;
+  case KeyF:
+    return GLFW_KEY_F;
+  case KeyG:
+    return GLFW_KEY_G;
+  case KeyH:
+    return GLFW_KEY_H;
+  case KeyI:
+    return GLFW_KEY_I;
+  case KeyJ:
+    return GLFW_KEY_J;
+  case KeyK:
+    return GLFW_KEY_K;
+  case KeyL:
+    return GLFW_KEY_L;
+  case KeyM:
+    return GLFW_KEY_M;
+  case KeyN:
+    return GLFW_KEY_N;
+  case KeyO:
+    return GLFW_KEY_O;
+  case KeyP:
+    return GLFW_KEY_P;
+  case KeyQ:
+    return GLFW_KEY_Q;
+  case KeyR:
+    return GLFW_KEY_R;
+  case KeyS:
+    return GLFW_KEY_S;
+  case KeyT:
+    return GLFW_KEY_T;
+  case KeyU:
+    return GLFW_KEY_U;
+  case KeyV:
+    return GLFW_KEY_V;
+  case KeyW:
+    return GLFW_KEY_W;
+  case KeyX:
+    return GLFW_KEY_X;
+  case KeyY:
+    return GLFW_KEY_Y;
+  case KeyZ:
+    return GLFW_KEY_Z;
+  }
+}
-- 
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