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_N_GUI_CURVE_MOUSE Struct _N_GUI_GRID Struct _N_GUI_POPUP_ENTRY Struct _N_GUI_POPUP_LEVEL Struct _N_GUI_SB_SKIN Struct _N_GUI_TA_STEP Struct _N_GUI_THUMB Struct _N_GUI_WRAP_ACC Struct _compiled Struct _conn Struct _ip_slot Struct _mp_param Struct _n_civil Struct _seg Struct client Struct collector Struct date_vector Struct md_atom Struct md_cells Struct md_hit Struct md_line_ctx Struct mline Struct n_http_req_header Struct n_http_req_limits Struct n_http_request Struct n_markdown_block Struct n_markdown_doc Struct n_markdown_inline Struct n_markdown_span Struct n_reactor_stats Struct n_url_safe Struct n_url_safe_head Struct n_wrap_item Struct producer_state Struct rects Struct reply Struct runner Struct sink Struct tbuf Struct wrap_hit Struct wrap_span Structures Union COORD_VALUE Union HASH_DATA Union NODE_DATA_TYPES Union STACK_DATA dir_310dcdd4703e877a6b99d5dc3fc54d27 dir_68267d1309a1af8e8297ef4c3efbcdba dir_d28a4824dc47e487b107a5db32ef43c4 dir_d44c64559bbebec7f509842c48db8b23 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ex_gui_dropmenu_8c example ex_gui_frameless_drag_8c example ex_gui_global_scroll_8c example ex_gui_glyph_8c example ex_gui_grid_8c example ex_gui_hexview_8c example ex_gui_hover_8c example ex_gui_isometric_8c example ex_gui_kvtable_8c example ex_gui_label_fits_8c example ex_gui_label_lines_8c example ex_gui_layout_persist_8c example ex_gui_listbox_8c example ex_gui_md_8c example ex_gui_multiwin_8c example ex_gui_network_8c example ex_gui_particles_8c example ex_gui_placeholder_8c example ex_gui_popup_8c example ex_gui_progressbar_8c example ex_gui_reentrant_8c example ex_gui_round_8c example ex_gui_sectionlist_8c example ex_gui_slider_default_8c example ex_gui_slider_handle_8c example ex_gui_slider_step_8c example ex_gui_splitpane_8c example ex_gui_suggest_8c example ex_gui_syntaxview_8c example ex_gui_text_shorten_8c example ex_gui_textarea_selection_8c example ex_gui_tooltip_8c example ex_gui_tree_lazy_8c example ex_gui_tree_order_8c example ex_gui_tree_state_8c example ex_gui_window_rect_8c example ex_gui_zorder_8c example ex_hash_8c example ex_hex_8c example ex_html_8c example ex_http2_8c example ex_http2_server_8c example ex_http_cookie_8c example ex_http_form_8c example ex_http_mime_8c example ex_http_req_8c example ex_http_response_8c example ex_http_router_8c example ex_http_server_8c example ex_icc_8c example ex_iso_astar_8c example ex_json_8c example ex_kafka_8c example ex_linalg_8c example ex_list_8c example ex_log_8c example ex_markdown_8c example ex_module_8c example ex_monolith_8c example ex_network_8c example ex_network_8h example ex_network_accept_8c example ex_network_alpn_8c example ex_network_connect_abort_8c example ex_network_mock_8c example ex_network_proxy_8c example ex_network_reactor_8c example ex_network_sni_8c example ex_network_sse_8c example ex_network_ssl_8c example ex_network_ssl_hardened_8c example ex_network_ssl_hostname_8c example ex_network_ssl_nonblock_8c example ex_network_tls_defaults_8c example ex_network_ws_8c example ex_network_ws_limits_8c example ex_nstr_8c example ex_parallel_for_8c example ex_parallel_team_8c example ex_pcre_8c example ex_pretty_8c example ex_pth_8c example ex_query_8c example ex_random_8c example ex_sha256_8c example ex_signals_8c example ex_spawn_8c example ex_ssrf_8c example ex_stack_8c example ex_threads_8c example ex_tiff_8c example ex_time_formats_8c example ex_trajectory_8c example ex_trees_8c example ex_url_8c example ex_url_safe_8c example ex_wrap_8c example ex_x509_8c example ex_zip_8c example ex_zlib_8c example mainpage_8dox n__3d_8c n__3d_8h n__aabb_8c n__aabb_8h n__allegro5_8c n__allegro5_8h n__allegro__4_8c n__allegro__4_8h n__anim_8c n__anim_8h n__astar_8c n__astar_8h n__atlas_8c n__atlas_8h n__avro_8c n__avro_8h n__base64_8c n__base64_8h n__clipboard_8c n__clipboard_8h n__clock__sync_8c n__clock__sync_8h n__common_8c n__common_8h n__config__file_8c n__config__file_8h n__cookies_8c n__cookies_8h n__crypto_8c n__crypto_8h n__dead__reckoning_8c 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5 Struct ISO_MAP
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

ISO_MAP

Module: GRAPHICS: isometric engine, maps, tiles, ...

Height-aware isometric map with terrain and height layers, per-cell height values, configurable projection, and terrain transition support.

#include "n_iso_engine.h"

Public Attributes

Name
int width
map width in tiles (X axis)
int * terrain
terrain type per cell [height * width], indices 0..num_terrains-1
int smooth_slope_max
max height diff rendered as slope (default 1)
int smooth_height
0 = CUT mode (cliff walls), 1 = SMOOTH mode (per-corner slopes)
int show_grid
1 = draw grid overlay
ISO_TILE_SEGMENTS * segments
Per-cell height segments.
ISO_PROJECTION proj
current projection parameters
int * overlay
overlay tile index per cell [height * width], 0 = none.
int num_terrains
number of terrain types used
int * neighbor_terrains_west
[height], terrain of west neighbor's east edge
int * neighbor_terrains_south
[width], terrain of south neighbor's north edge
int * neighbor_terrains_north
[width], terrain of north neighbor's south edge
int * neighbor_terrains_east
[height], terrain of east neighbor's west edge
int * neighbor_heights_west
Heights from west neighbor chunk's east edge [height], NULL = boundary.
int * neighbor_heights_south
Heights from south neighbor chunk's north edge [width], NULL = boundary.
int * neighbor_heights_north
Heights from north neighbor chunk's south edge [width], NULL = boundary.
int * neighbor_heights_east
Heights from east neighbor chunk's west edge [height], NULL = boundary.
int max_height
maximum allowed height value
int hover_my
hovered tile Y (-1 = none)
int hover_mx
hovered tile X (-1 = none)
int * heightmap
height value per cell [height * width], 0..max_height
float height_tint_intensity
0.0 = no tint, 0.3 = subtle, 1.0 = full range.
int height
map height in tiles (Y axis)
float * dynamic_light_map
Per-tile dynamic light accumulation buffer.
int draw_order_dirty
int cached_draw_order_count
int cached_draw_order_cap
ISO_DRAW_ENTRY * cached_draw_order
Cached draw_order.
float ambient_r
Global ambient color (day/night + dark place tinting).
float ambient_g
float ambient_b
int * ability
walkability per cell [height * width] (WALK/SWIM/BLCK)

Public Attributes Documentation

variable width

int width;

map width in tiles (X axis)

variable terrain

int * terrain;

terrain type per cell [height * width], indices 0..num_terrains-1

variable smooth_slope_max

int smooth_slope_max;

max height diff rendered as slope (default 1)

variable smooth_height

int smooth_height;

0 = CUT mode (cliff walls), 1 = SMOOTH mode (per-corner slopes)

variable show_grid

int show_grid;

1 = draw grid overlay

variable segments

ISO_TILE_SEGMENTS * segments;

Per-cell height segments.

NULL = use heightmap as single segment. When non-NULL, heightmap[] is derived (top of highest segment).

variable proj

ISO_PROJECTION proj;

current projection parameters

variable overlay

int * overlay;

overlay tile index per cell [height * width], 0 = none.

NULL = no overlays

variable num_terrains

int num_terrains;

number of terrain types used

variable neighbor_terrains_west

int * neighbor_terrains_west;

[height], terrain of west neighbor's east edge

variable neighbor_terrains_south

int * neighbor_terrains_south;

[width], terrain of south neighbor's north edge

variable neighbor_terrains_north

int * neighbor_terrains_north;

[width], terrain of north neighbor's south edge

variable neighbor_terrains_east

int * neighbor_terrains_east;

[height], terrain of east neighbor's west edge

variable neighbor_heights_west

int * neighbor_heights_west;

Heights from west neighbor chunk's east edge [height], NULL = boundary.

variable neighbor_heights_south

int * neighbor_heights_south;

Heights from south neighbor chunk's north edge [width], NULL = boundary.

variable neighbor_heights_north

int * neighbor_heights_north;

Heights from north neighbor chunk's south edge [width], NULL = boundary.

variable neighbor_heights_east

int * neighbor_heights_east;

Heights from east neighbor chunk's west edge [height], NULL = boundary.

variable max_height

int max_height;

maximum allowed height value

variable hover_my

int hover_my;

hovered tile Y (-1 = none)

variable hover_mx

int hover_mx;

hovered tile X (-1 = none)

variable heightmap

int * heightmap;

height value per cell [height * width], 0..max_height

variable height_tint_intensity

float height_tint_intensity;

0.0 = no tint, 0.3 = subtle, 1.0 = full range.

Higher segments are brighter, lower are darker. Applied as a multiply tint on tile top faces and walls.

variable height

int height;

map height in tiles (Y axis)

variable dynamic_light_map

float * dynamic_light_map;

Per-tile dynamic light accumulation buffer.

Caller fills this before iso_map_draw() with additive light contributions. Array of [width * height * 3] floats (r, g, b per tile). NULL = no dynamic lighting. Caller-owned.

variable draw_order_dirty

int draw_order_dirty;

variable cached_draw_order_count

int cached_draw_order_count;

variable cached_draw_order_cap

int cached_draw_order_cap;

variable cached_draw_order

ISO_DRAW_ENTRY * cached_draw_order;

Cached draw_order.

The qsort+build in [iso_map_build_draw_order](Module-ISOMETRIC_ENGINE#user-content-function-iso_map_build_draw_order) is expensive (1024+ entries x 25 chunks per frame = ~3 ms in profiled bench). Cache the result on the map and only rebuild when segments or heights change. Setters that mutate either field ([iso_map_set_segments](Module-ISOMETRIC_ENGINE#user-content-function-iso_map_set_segments) is the only public one) set [draw_order_dirty](Struct-ISO_MAP#user-content-variable-draw_order_dirty) = 1. [iso_map_draw](Module-ISOMETRIC_ENGINE#user-content-function-iso_map_draw) rebuilds into [cached_draw_order](Struct-ISO_MAP#user-content-variable-cached_draw_order) when dirty, then reuses across frames. Lifetime tied to the map; freed in [iso_map_free](Module-ISOMETRIC_ENGINE#user-content-function-iso_map_free).

variable ambient_r

float ambient_r;

Global ambient color (day/night + dark place tinting).

Applied as additional multiply on top of height tinting. Default: (1.0, 1.0, 1.0) = no change. Set by client lighting system each frame.

variable ambient_g

float ambient_g;

variable ambient_b

float ambient_b;

variable ability

int * ability;

walkability per cell [height * width] (WALK/SWIM/BLCK)

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