Updated keyboard handling

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

raycaster.c

@@ -40,6 +40,12 @@ int map[] =
 };
 // clang-format on
 
+typedef struct
+{
+  int w, a, d, s; // Button state on/off
+} ButtonKeys;
+ButtonKeys Keys;
+
 // Function to check if a number is a power of 2
 int isPowerOfTwo(int n)
 {
@@ -459,26 +465,9 @@ void drawFloor()
 // * Main rendering
 void display()
 {
-  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-  drawCeiling();
-  drawFloor();
-  drawMap2D();
-  drawRays3D();
-  drawPlayer();
-
-  glutSwapBuffers();
-}
-
-void resize(int w, int h)
-{
-  glutReshapeWindow(1024, 512);
-}
-
-// * Check for key presses and move the "player" accordingly
-void buttons(unsigned char key, int x, int y)
-{
+  // * Handle keyboard inputs
   // ? Move left
-  if (key == 'a')
+  if (Keys.a == 1)
   {
     // We change the angle by a small value because we're not working with
     // degrees. In C, we instead use radians, which is 0 -> 2π.
@@ -501,7 +490,7 @@ void buttons(unsigned char key, int x, int y)
   }
 
   // ? Move right
-  if (key == 'd')
+  if (Keys.d == 1)
   {
     playerAngle += 0.1;
 
@@ -515,7 +504,7 @@ void buttons(unsigned char key, int x, int y)
   }
 
   // ? Move forward
-  if (key == 'w')
+  if (Keys.w == 1)
   {
     // We change the X and Y values based on our delta, which is calculated
     // during our rotation.
@@ -524,14 +513,82 @@ void buttons(unsigned char key, int x, int y)
   }
 
   // ? Move backwards
-  if (key == 's')
+  if (Keys.s == 1)
   {
     playerX -= playerDeltaX;
     playerY -= playerDeltaY;
   }
   glutPostRedisplay();
+
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  drawCeiling();
+  drawFloor();
+  drawMap2D();
+  drawRays3D();
+  drawPlayer();
+
+  glutSwapBuffers();
 }
 
+// * Key input handling
+void ButtonDown(unsigned char key, int x, int y)
+{
+  if (key == 'a')
+  {
+    Keys.a = 1;
+  }
+
+  if (key == 'd')
+  {
+    Keys.d = 1;
+  }
+
+  if (key == 'w')
+  {
+    Keys.w = 1;
+  }
+
+  if (key == 's')
+  {
+    Keys.s = 1;
+  }
+
+  glutPostRedisplay();
+}
+
+void ButtonUp(unsigned char key, int x, int y)
+{
+  if (key == 'a')
+  {
+    Keys.a = 0;
+  }
+
+  if (key == 'd')
+  {
+    Keys.d = 0;
+  }
+
+  if (key == 'w')
+  {
+    Keys.w = 0;
+  }
+
+  if (key == 's')
+  {
+    Keys.s = 0;
+  }
+
+  glutPostRedisplay();
+}
+
+// * Window resizing
+void resize(int w, int h)
+{
+  glutReshapeWindow(1024, 512);
+}
+
+// * Check for key presses and move the "player" accordingly
+
 void init()
 {
 
@@ -574,7 +631,8 @@ int main(int argc, char *argv[])
   glutReshapeFunc(resize);
 
   // Send key presses to the keyboard function
-  glutKeyboardFunc(buttons);
+  glutKeyboardFunc(ButtonDown);
+  glutKeyboardUpFunc(ButtonUp);
 
   glutMainLoop();
 }