Make entity rotation work properly

game/src/chunk/chunk.c

@@ -14,13 +14,6 @@ Chunk_new ()
   return chunk;
 }
 
-/* Example function for a tick for an entity. */
-void
-tree_grow (Entity *entity)
-{
-  entity->scale[1] += 0.01;
-}
-
 void
 Chunk_random (Chunk *chunk, int xoffset, int zoffset)
 {
@@ -44,10 +37,9 @@ Chunk_random (Chunk *chunk, int xoffset, int zoffset)
 		.mesh_type = ENTITY_MESH_X,
 		.origin = ENTITY_BOTTOM,
 		.position = { (float) x + xoffset, chunk->heightmap[INDEX (x, z)], (float) z + zoffset },
-		.scale = { 3.0, 10.0, 3.0 },
-		.rotation = (rand () % 180) * (M_PI / 180.0),
+		.scale = { 3.0, (rand()) % 5 + 5, 3.0 },
+		.rotation = rand () % 180,
 		.texture = "tree0",
-		.on_tick = tree_grow
 	      };
 
 	      EM_ENTADD (tree);

game/src/entity/manager.c

@@ -56,6 +56,8 @@ em_render_internal (gpointer data, gpointer userdata)
     }
 
   mat4 model = GLM_MAT4_IDENTITY_INIT;
+
+  glm_rotate_at (model, entity->position, DEGTORAD (entity->rotation), (vec3) { 0.0, 1.0, 0.0 });
   glm_translate (model, entity->position);
 
   if (entity->origin == ENTITY_BOTTOM)
@@ -64,7 +66,7 @@ em_render_internal (gpointer data, gpointer userdata)
     }
 
   glm_scale (model, entity->scale);
-
+  
   program_use (program);
   program_set_mat4 (program, "model", model);
 

game/src/util.h

@@ -17,6 +17,8 @@
 
 #define CLAMP(x, low, high) (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
 
+#define DEGTORAD(deg) ((deg) * (M_PI / 180.0))
+
 #define UNUSED(...)                   (UNUSED_1 (__VA_ARGS__, 0))
 #define UNUSED_1(arg, ...) (void) arg, UNUSED_2 (__VA_ARGS__, 0)
 #define UNUSED_2(arg, ...) (void) arg, UNUSED_3 (__VA_ARGS__, 0)