Server: Reduce malloc() calls in FOV generation.

[plomrogue] / src / server / field_of_view.c

diff --git a/src/server/field_of_view.c b/src/server/field_of_view.c
index 278cc8b8d5b4a34c46f92319db35d0ddf9161b6b..440c84c2d6bea8a050673b30a7f3ff4a1321a5fc 100644 (file)
--- a/src/server/field_of_view.c
+++ b/src/server/field_of_view.c
@@ -6,7 +6,6 @@
 #include <string.h> /* memset() */
 #include "../common/rexit.h" /* exit_trouble() */
 #include "../common/try_malloc.h" /* try_malloc() */
-#include "map.h" /* yx_to_map_pos() */
 #include "things.h" /* Thing */
 #include "yx_uint8.h" /* yx_uint8 */
 #include "world.h" /* world  */
@@ -317,7 +316,7 @@ static void eval_position(uint16_t dist, uint16_t hex_i, uint8_t * fov_map,
     uint32_t left_angle  = correct_angle(left_angle_uncorrected);
     uint32_t right_angle = correct_angle(right_angle_uncorrected);
     uint32_t right_angle_1st = right_angle > left_angle ? 0 : right_angle;
-    uint16_t pos_in_map = yx_to_map_pos(test_pos);
+    uint16_t pos_in_map = test_pos->y * world.map.length + test_pos->x;
     set_shadow(left_angle, right_angle_1st, shadows, pos_in_map, fov_map);
     if (right_angle_1st != right_angle)
     {
@@ -328,12 +327,12 @@ static void eval_position(uint16_t dist, uint16_t hex_i, uint8_t * fov_map,
 
 
 
-extern uint8_t * build_fov_map(struct Thing * eye)
+extern void build_fov_map(struct Thing * t)
 {
     uint32_t map_size = world.map.length * world.map.length;
-    uint8_t * fov_map = try_malloc(map_size, __func__);
-    memset(fov_map, VISIBLE, map_size);
-    struct yx_uint8 test_pos = eye->pos;
+    t->fov_map = t->fov_map ? t->fov_map : try_malloc(map_size, __func__);
+    memset(t->fov_map, VISIBLE, map_size);
+    struct yx_uint8 test_pos = t->pos;
     struct shadow_angle * shadows = NULL;
     char * circle_dirs = "xswedc";
     uint16_t dist;
@@ -351,7 +350,7 @@ extern uint8_t * build_fov_map(struct Thing * eye)
         {
             if (mv_yx_in_dir_legal(dir, &test_pos))
             {
-                eval_position(dist, hex_i, fov_map, &test_pos, &shadows);
+                eval_position(dist, hex_i, t->fov_map, &test_pos, &shadows);
                 circle_on_map = 1;
             }
             dir = circle_dirs[i_dir];
@@ -364,5 +363,4 @@ extern uint8_t * build_fov_map(struct Thing * eye)
     }
     mv_yx_in_dir_wrap(0, NULL, 1);
     free_angles(shadows);
-    return fov_map;
 }