Adding triggers, prepping for map loading.

assets/testmap.json

@@ -0,0 +1,27 @@
+{
+  "width": 10,
+  "height": 10,
+  "layers": [
+    {
+      "tiles": [
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1
+      ]
+    }
+  ],
+  "entities": [
+    {
+      "type": 1,
+      "x": 0,
+      "y": 0
+    }
+  ]
+}

src/dawn/rpg/entity/entity.c

@@ -115,6 +115,14 @@ void entityWalk(entity_t *entity, const uint8_t dir) {
 
   entity->state = ENTITY_STATE_WALKING;
   entity->walk.time = 0.1f;
+
+  // Check for triggers
+  trigger_t *trigger = mapTriggerGetByPosition(
+    entity->map,
+    entity->x,
+    entity->y
+  );
+  if(trigger != NULL) triggerOnStep(trigger, entity);
 }
 
 void entityPositionSet(entity_t *entity, const uint16_t x, const uint16_t y) {

src/dawn/rpg/world/CMakeLists.txt

@@ -10,4 +10,5 @@ target_sources(${DAWN_TARGET_NAME}
   PRIVATE
     tile.c
     map.c
+    trigger.c
 )

src/dawn/rpg/world/map.c

@@ -36,7 +36,7 @@ void mapInit(
     "Map layers must be greater than 0."
   );
   assertTrue(
-    layers < MAP_LAYERS_MAX,
+    layers <= MAP_LAYERS_MAX,
     "Map layers must be less than or equal to MAP_LAYERS_MAX."
   );
 
@@ -137,4 +137,33 @@ void mapTilesSet(
     tiles,
     map->width * map->height * sizeof(tile_t)
   );
+}
+
+trigger_t * mapTriggerAdd(map_t *map) {
+  assertTrue(
+    map->triggerCount < MAP_TRIGGERS_MAX,
+    "Cannot add any more triggers to map."
+  );
+
+  trigger_t *trigger = &map->triggers[map->triggerCount];
+  map->triggerCount++;
+  return trigger;
+}
+
+trigger_t * mapTriggerGetByPosition(
+  map_t *map,
+  const uint16_t x,
+  const uint16_t y
+) {
+  for(uint8_t i = 0; i < map->triggerCount; i++) {
+    trigger_t *trigger = &map->triggers[i];
+    if(
+      x >= trigger->x &&
+      x < trigger->x + trigger->width &&
+      y >= trigger->y &&
+      y < trigger->y + trigger->height
+    ) return trigger;
+  }
+
+  return NULL;
 }

src/dawn/rpg/world/map.h

@@ -8,11 +8,13 @@
 #pragma once
 #include "tile.h"
 #include "rpg/entity/entity.h"
+#include "rpg/world/trigger.h"
 
 #define MAP_WIDTH_MAX 2048
 #define MAP_HEIGHT_MAX 2048
-#define MAP_LAYERS_MAX 4
+#define MAP_LAYERS_MAX 1
 #define MAP_ENTITIES_MAX 256
+#define MAP_TRIGGERS_MAX 64
 
 typedef struct _map_t {
   tile_t tiles[MAP_WIDTH_MAX * MAP_HEIGHT_MAX * MAP_LAYERS_MAX];
@@ -22,6 +24,9 @@ typedef struct _map_t {
 
   entity_t entities[MAP_ENTITIES_MAX];
   uint8_t entityCount;
+  
+  trigger_t triggers[MAP_TRIGGERS_MAX];
+  uint8_t triggerCount;
 } map_t;
 
 /**
@@ -107,4 +112,26 @@ void mapTilesSet(
   map_t *map,
   const tile_t tiles[],
   const uint8_t layer
+);
+
+/**
+ * Adds a trigger to the map.
+ * 
+ * @param map Map to add the trigger to.
+ * @return Trigger added to the map.
+ */
+trigger_t * mapTriggerAdd(map_t *map);
+
+/**
+ * Gets the trigger at the specified position.
+ * 
+ * @param map Map to get the trigger from.
+ * @param x X position of the trigger.
+ * @param y Y position of the trigger.
+ * @return Trigger at the specified position, or NULL if no trigger is there.
+ */
+trigger_t * mapTriggerGetByPosition(
+  map_t *map,
+  const uint16_t x,
+  const uint16_t y
 );

src/dawn/rpg/world/maps/testmap.h

@@ -24,6 +24,9 @@ void testMapInit(map_t *map) {
   entityInit(npc, ENTITY_TYPE_NPC, map);
   entityPositionSet(npc, 10, 10);
 
+  trigger_t *trigger = mapTriggerAdd(map);
+  triggerInit(trigger, TRIGGER_TYPE_NULL, 15, 15, 1, 1);
+
   tile_t tiles[TEST_MAP_WIDTH * TEST_MAP_HEIGHT];
   for(uint32_t i = 0; i < TEST_MAP_WIDTH * TEST_MAP_HEIGHT; i++) {
     tiles[i].id = TILE_ID_GRASS;

src/dawn/rpg/world/trigger.c

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2024 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "trigger.h"
+#include "assert/assert.h"
+
+void triggerInit(
+  trigger_t *trigger,
+  const uint8_t type,
+  const uint16_t x,
+  const uint16_t y,
+  const uint16_t width,
+  const uint16_t height
+) {
+  assertNotNull(trigger, "Trigger cannot be NULL.");
+  assertTrue(
+    width > 0,
+    "Trigger width must be greater than 0."
+  );
+  assertTrue(
+    height > 0,
+    "Trigger height must be greater than 0."
+  );
+
+  memset(trigger, 0, sizeof(trigger_t));
+  trigger->type = type;
+  trigger->x = x;
+  trigger->y = y;
+  trigger->width = width;
+  trigger->height = height;
+}
+
+void triggerOnStep(trigger_t *trigger, entity_t *entity) {
+  assertNotNull(trigger, "Trigger cannot be NULL.");
+  assertNotNull(entity, "Entity cannot be NULL.");
+  
+  printf("Trigger\n");
+}

src/dawn/rpg/world/trigger.h

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2024 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "rpg/entity/entity.h"
+
+#define TRIGGER_TYPE_NULL 0
+
+typedef struct {
+  uint16_t x, y;
+  uint16_t width, height;
+  uint8_t type;
+} trigger_t;
+
+/**
+ * Initializes a trigger.
+ * 
+ * @param trigger Trigger to initialize.
+ * @param type Type of trigger.
+ * @param x X position of the trigger.
+ * @param y Y position of the trigger.
+ * @param width Width of the trigger.
+ * @param height Height of the trigger.
+ */
+void triggerInit(
+  trigger_t *trigger,
+  const uint8_t type,
+  const uint16_t x,
+  const uint16_t y,
+  const uint16_t width,
+  const uint16_t height
+);
+
+/**
+ * Called by an entity that has stepped on the trigger.
+ * 
+ * @param trigger Trigger that was stepped on.
+ * @param entity Entity that stepped on the trigger.
+ */
+void triggerOnStep(trigger_t *trigger, entity_t *entity);