input

src/input.c

@@ -91,6 +91,7 @@ void inputUpdate() {
       // Button was pressed
       val |= map->value;
       i += len - 1;
+      break;
     } while(map->key);
   }
   
@@ -98,6 +99,22 @@ void inputUpdate() {
   INPUT.current = val;
 }
 
+bool_t inputIsDown(const uint8_t key) {
+  return (INPUT.current & key) != 0;
+}
+
+bool_t inputWasDown(const uint8_t key) {
+  return (INPUT.previous & key) != 0;
+}
+
+bool_t inputWasPressed(const uint8_t key) {
+  return inputIsDown(key) && !inputWasDown(key);
+}
+
+bool_t inputWasReleased(const uint8_t key) {
+  return !inputIsDown(key) && inputWasDown(key);
+}
+
 void inputDispose() {
   inputDisableRawMode();
 }

src/input.h

@@ -43,3 +43,35 @@ void inputInit();
  * Updates the input system.
  */
 void inputUpdate();
+
+/**
+ * Returns true if the specified key is currently pressed down.
+ * 
+ * @param key The key to check.
+ * @return True if the key is down, false otherwise.
+ */
+bool_t inputIsDown(const uint8_t key);
+
+/**
+ * Returns true if the specified key was pressed down in the previous frame.
+ * 
+ * @param key The key to check.
+ * @return True if the key was down in the previous frame, false otherwise.
+ */
+bool_t inputWasDown(const uint8_t key);
+
+/**
+ * Returns true if the specified key was pressed in the current frame.
+ * 
+ * @param key The key to check.
+ * @return True if the key was pressed, false otherwise.
+ */ 
+bool_t inputWasPressed(const uint8_t key);
+
+/**
+ * Returns true if the specified key was released in the current frame.
+ * 
+ * @param key The key to check.
+ * @return True if the key was released, false otherwise.
+ */
+bool_t inputWasReleased(const uint8_t key);

src/main.c

@@ -33,8 +33,14 @@ int32_t main(const int32_t argc, const char **argv) {
       entityUpdate(ent++);
     } while(ent < (ENTITIES + ENTITY_COUNT));
 
-    renderUpdate();
-    usleep(100 * 1000); // Sleep for 16 milliseconds (60 FPS)
+    if(inputIsDown(INPUT_DOWN)) {
+      printf("Input down pressed\n");
+    } else {
+      printf("Input down not pressed\n");
+    }
+
+    // renderUpdate();
+    usleep(16 * 1000); // Sleep for 16 milliseconds (60 FPS)
   }
 
   return EXIT_SUCCESS;

src/rpg/entity/entity.c

@@ -39,9 +39,58 @@ void entityUpdate(entity_t *entity) {
     "Entity type has no update"
   );
 
+  // Handle subpixel movement
+  if(entity->subX < 0) {
+    entity->subX++;
+  } else if(entity->subY < 0) {
+    entity->subY++;
+  } else if(entity->subX > 0) {
+    entity->subX--;
+  } else if(entity->subY > 0) {
+    entity->subY--;
+  }
+
+  // Entity-Type handling
   ENTITY_CALLBACKS[entity->type].update(entity);
 }
 
+void entityTurn(entity_t *entity, const entitydir_t dir) {
+  assertNotNull(entity, "Entity cannot be NULL");
+  assertFalse(entityIsWalking(entity), "Entity is currently walking");
+  entity->dir = dir;
+}
+
+void entityWalk(entity_t *entity) {
+  assertNotNull(entity, "Entity cannot be NULL");
+  assertFalse(entityIsWalking(entity), "Entity is already walking");
+
+  switch(entity->dir) {
+    case ENTITY_DIR_UP:
+      entity->y--;
+      entity->subY = ENTITY_MOVE_SUBPIXEL;
+      break;
+    case ENTITY_DIR_DOWN:
+      entity->y++;
+      entity->subY = -ENTITY_MOVE_SUBPIXEL;
+      break;
+    case ENTITY_DIR_LEFT:
+      entity->x--;
+      entity->subX = ENTITY_MOVE_SUBPIXEL;
+      break;
+    case ENTITY_DIR_RIGHT:
+      entity->x++;
+      entity->subX = -ENTITY_MOVE_SUBPIXEL;
+      break;
+    default:
+      assertUnreachable("Invalid entity direction");
+  }
+}
+
+bool_t entityIsWalking(const entity_t *entity) {
+  assertNotNull(entity, "Entity cannot be NULL");
+  return (entity->subX != 0 || entity->subY != 0);
+}
+
 entity_t * entityGetAt(const uint8_t x, const uint8_t y) {
   entity_t *e = ENTITIES;
   do {

src/rpg/entity/entity.h

@@ -8,6 +8,8 @@
 #pragma once
 #include "player.h"
 
+#define ENTITY_MOVE_SUBPIXEL 4
+
 typedef enum {
   ENTITY_DIR_UP = 0,
   ENTITY_DIR_DOWN = 1,
@@ -62,6 +64,29 @@ void entityInit(entity_t *entity, const entitytype_t type);
  */
 void entityUpdate(entity_t *entity);
 
+/**
+ * Turns the entity to face a specific direction.
+ * 
+ * @param entity Pointer to the entity to turn.
+ * @param dir The direction to turn the entity towards.
+ */
+void entityTurn(entity_t *entity, const entitydir_t dir);
+
+/**
+ * Makes the entity walk in the current direction.
+ * 
+ * @param entity Pointer to the entity to make walk.
+ */
+void entityWalk(entity_t *entity);
+
+/**
+ * Checks if the entity is currently mid-walking.
+ * 
+ * @param entity Pointer to the entity to check.
+ * @return true if the entity is walking, false otherwise.
+ */
+bool_t entityIsWalking(const entity_t *entity);
+
 /**
  * Resets the entity at a given position.
  * 

src/rpg/entity/player.c

@@ -7,6 +7,7 @@
 
 #include "entity.h"
 #include "assert/assert.h"
+#include "input.h"
 
 void playerInit(entity_t *player) {
   assertNotNull(player, "Player entity is NULL");
@@ -16,4 +17,26 @@ void playerInit(entity_t *player) {
 void playerUpdate(entity_t *entity) {
   assertNotNull(entity, "Entity is NULL");
   assertTrue(entity->type == ENTITY_TYPE_PLAYER, "Entity is not a player");
+
+  if(!entityIsWalking(entity)) {
+    entitydir_t dir = 0xFF;
+    if(inputIsDown(INPUT_UP)) {
+      dir = ENTITY_DIR_UP;
+    } else if(inputIsDown(INPUT_DOWN)) {
+      dir = ENTITY_DIR_DOWN;
+    } else if(inputIsDown(INPUT_LEFT)) {
+      dir = ENTITY_DIR_LEFT;
+    } else if(inputIsDown(INPUT_RIGHT)) {
+      dir = ENTITY_DIR_RIGHT;
+    }
+    
+    if(dir != 0xFF) {
+      if(dir != entity->dir) {
+        entityTurn(entity, dir);
+      } else {
+        entityWalk(entity);
+      }
+    }
+  }
+
 }