Allow configuration of unit view distance

C3X.h

@@ -94,6 +94,16 @@ struct work_area_improvement {
 	int work_area_radius_bonus;
 };
 
+struct unit_visibility_rule {
+	struct table unit_ids; // Table mapping unit type IDs to 1's; used as a hash set
+	enum UnitTypeClasses unit_class;
+
+	int base_visibility;
+	int terrain_bonus_multiplier;
+	int fortification_bonus;
+	bool fortification_bonus_continent_lock;
+};
+
 enum retreat_rules {
 	RR_STANDARD = 0,
 	RR_NONE,
@@ -568,6 +578,20 @@ struct c3x_config {
 	int ai_auto_build_great_wall_strategy;
 
 	bool enable_city_work_radii_highlights;
+
+	bool enable_alternate_view_distance_logic; //enable the whole system or not
+	bool terrain_visibility_euclidean; //whether the upper bound should be determined by a euclidean metric than a chebyshev one.
+	int base_visibility_range; //should default to 1
+	int terrain_visibility_see_height[14]; //most tiles are 1, mountains+volcanoes are 2
+	int terrain_visibility_seen_height[14]; //most tiles are 0, forest+jungle+hills are 1, mountains+volcanoes are 2
+	int terrain_visibility_bonus[14]; //most tiles are 0, hills+mountains+volcanoes are 1
+	bool terrain_visibility_bonus_can_stack; //whether seeing hills and being on a hill provides double the bonus
+	bool terrain_visibility_flat_bonus[14]; //water tiles provide height bonus to tiles being seen across them [ie +2] / adjacent tiles always seen
+	int terrain_visibility_flat_bonus_limit; //maximum size of the flat bonus, in tiles
+	bool terrain_visibility_flat_bonus_can_stack; //whether flat bonus and regular bonus can both apply at once
+	struct unit_visibility_rule * unit_visibility_rule_list; //should default to naval unit type has +1 range in fortification with continent lock
+	int c_unit_visibility_rules;
+	//tiles blocked by obstructions are visible if *either* intermediate tile is not blocking in height.
 };
 
 enum stackable_command {

Civ3Conquests.h

@@ -3312,7 +3312,7 @@ struct Leader_vtable
 //  void (__thiscall *m28)(Leader *);
   void *m28;
   int m29;
-  int m30;
+  void (__fastcall * ai_negotiate_with_other_ai) (Leader * this, int edx, int other_civ_id);
   int m31;
   int m32;
   int (__fastcall * get_attitude_toward) (Leader * this, int edx, int civ_id, int param_2);

civ_prog_objects.csv

@@ -952,6 +952,17 @@ define,	   0x4D519C,	0x4DD953,	0x4D525C,	"ADDR_AIR_UNIT_CHECK_TO_DRAW_PEDIA_STAT
 define,	   0x1A8,	0x1A9,		0x1A8,		"LBL_BOMBARD_RANGE",				"int"
 define,	   0x437F20,	0x439AC0,	0x437FA0,	"Unit_get_transport_capacity",			"int (__fastcall *) (Unit * this)"
 inlead,	   0x5543B0,	0x55FB10,	0x554360,	"Main_GUI_get_unit_stat_str",			"void (__fastcall *) (Main_GUI * this, int edx, char * out_str, Unit * unit)"
+inlead,	   0x5BA010,	0x5C8AD0,	0x5B9D20,	"Unit_can_see_tile",				"bool (__fastcall *) (Unit * this, int edx, int x, int y)"
+define,	   0x44A8D0,	0x44C870,	0x44A950,	"Map_chebyshev_distance",			"int (__fastcall *) (Map * this, int edx, int x1, int y1, int x2, int y2)"
+define,	   0x5BA1F9,	0x5C8CD6,	0x5B9F09,	"ADDR_UNIT_VISIBILITY_RADIUS_1",		"byte *"
+define,	   0x5BA29B,	0x5C8D76,	0x5B9FAB,	"ADDR_UNIT_VISIBILITY_RADIUS_2",		"byte *"
+define,	   0x5BA5F4,	0x5C90CD,	0x5BA304,	"ADDR_UNIT_VISIBILITY_RADIUS_3",		"byte *"
+define,	   0x5C811A,	0x5D6FF5,	0x5C7E2A,	"ADDR_UNIT_TO_UNIT_VISIBILITY_RADIUS",		"byte *"
+define,	   0x5BB7E6,	0x5CA333,	0x5BB4F6,	"ADDR_CIV_UNIT_VISIBILITY_RADIUS",		"byte *"
+define,	   0x5BEB25,	0x5CD745,	0x5BE835,	"ADDR_UTC_SEA_CMP_1",				"byte *"
+define,	   0x5C644C,	0x5D529C,	0x5C615C,	"ADDR_UTC_SEA_CMP_2",				"byte *"
+define,	   0x5C65C8,	0x5D5418,	0x5C62D8,	"ADDR_UTC_SEA_CMP_3",				"byte *"
+define,	   0x5C7E43,	0x5D6D08,	0x5C7B53,	"ADDR_UTC_SEA_CMP_4",				"byte *"
 
 ignore,	   0x5FC710,	0x0,		0x0,		"PCX_Image_create_and_init_jgl_image",		"int (__fastcall *) (PCX_Image * this, int edx, int width, int height, int bit_depth, int param_4, int param_5, int param_6)"
 ignore,	   0x5FCC50,	0x0,		0x0,		"PCX_Image_draw_region_to_location",		"void (__fastcall *) (PCX_Image * this, int edx, PCX_Image * canvas, int src_x, int src_y, int dest_x, int dest_y, int width, int height)"
@@ -976,4 +987,3 @@ ignore,	   0x4BF660,	0x4C6C10,	0x4BF6F0,	"City_draw_citizens",				"void (__fastc
 ignore,	   0x4B9F60,	0x4C15D0,	0x4B9FF0,	"City_add_population",				"void (__fastcall *) (City * this, int edx, int num, int race_id)"
 ignore,	   0x670234,	0x68D2E0,	0x670234,	"Tile_m27_Check_Shield_Bonus",			"bool (__fastcall *) (Tile * this)"
 ignore,	   0x5f3448,	0x6032DF,	0x5F3378,	"CHECK_SHIELD_BONUS_TO_CAN_SPAWN_RES_RETURN",	"int"
-

common.c

@@ -707,6 +707,29 @@ parse_bracketed_block (char ** p_cursor, struct string_slice * out)
 		return 0;
 }
 
+int
+parse_until_punctuation (char ** p_cursor, struct string_slice * out, char punct)
+{
+	char * cur = *p_cursor;
+	struct string_slice unused;
+	char * str_start = cur;
+	while (1) {
+		if (*cur == punct) {
+			break;
+		} else if (*cur == '"') {
+			if (! parse_string (&cur, &unused))
+				return 0;
+		} else if (*cur == '\0')
+			return 0;
+		else
+			cur++;
+	}
+	out->str = str_start;
+	out->len = cur - str_start;
+	*p_cursor = cur;
+	return 1;
+}
+
 int
 parse_csv_value (char ** p_cursor, char ** out_val, int * out_len)
 {

default.c3x_config.ini

@@ -1015,6 +1015,44 @@ prefer_less_expensive_defenders = false
 ; Sets the number of turns for which a successful "Steal Plans" espionage mission reveals the target civ's units. Values below 1 are treated as 1.
 steal_plans_duration = 1
 
+[==================]
+[=== VISIBILITY ===]
+[==================]
+
+; Whether to enable the alternate visibility system. Within this system, the total view distance cannot exceed 7 tiles due to technical limitations. Any visibility beyond this will be clamped.
+enable_alternate_view_distance_logic = false
+
+; Whether a euclidean (circular) metric is used instead of the normal chebyshev (square) one
+terrain_visibility_euclidean = false
+
+; The base view distance of units
+base_visibility_range = 1
+; The following settings have an entry for each terrain type, annotated and abbreviated as follows
+;                                [DESRT, PLAIN, GRSLD, TNDRA, FLDPL, HILLS, MNTNS, FORST, JUNGL, MARSH, VLCNO, COAST, SEA,   OCEAN]
+; The height a unit is considered to be standing at when on this type of tile.
+terrain_visibility_see_height =  [1,     1,     1,     1,     1,     1,     2,     1,     1,     1,     2,     1,     1,     1]
+; The hight a tile is considered to be seen from another tile. If this equals or exceed the see height, it will occlude tiles beyond.
+terrain_visibility_seen_height = [0,     0,     0,     0,     0,     1,     2,     1,     1,     0,     2,     0,     0,     0]
+; The bonus sight range granted by standing on or looking at a given tile
+terrain_visibility_bonus =       [0,     0,     0,     0,     0,     1,     1,     0,     0,     0,     1,     0,     0,     0]
+; Whether a unit on a tile with a bonus and seeing a tile with bonus is double rewarded. Otherwise, the large value is used. This may be necessary if you wish to use negative bonuses.
+terrain_visibility_bonus_can_stack = false
+; Whether tiles of the given type provide bonus view distance for seeing across them. This config only supports true and false.
+terrain_visibility_flat_bonus =  [false, false, false, false, false, false, false, false, false, false, false, true,  true,  true]
+; The number of times the flat bonus may be applied.
+terrain_visibility_flat_bonus_limit = 1
+; Whether the flat bonus may stack with the regular, height-based bonus.
+terrain_visibility_flat_bonus_can_stack = false
+
+; A list of rules for unit types or unit classes (Land, Sea, Air)
+; A single unit class may be given, or a list of unit names.
+; A base visibility can be given, a multiplier to the height based bonus visibility can be given (times-bonus), and a single fortification bonus can be given.
+; There are two mutually-exclusive types of fortification bonus: when-fortified and when-fortified-same-continent.
+; The latter reveals tiles on the same continent regardless of intermediate tiles and their bonuses.
+; The last rule matching a unit is used. Therefore, unit class rules should be at the start of the list.
+; The following is an example: [Scout: 1 + 2 times-bonus, "Landmine": 0 + 0 times-bonus, "Army" Leader Fleet: 2 + 2 when-fortified]
+unit_visibility_rules = [Sea: 2 when-fortified-same-continent]
+
 [==================]
 [=== AESTHETICS ===]
 [==================]