main.c File Reference

Tiled map editor integration with the map scrolling engine. More...

#include <snes.h>
#include <snes/map.h>

Functions
int	main (void)
	Entry point — initialize hardware, load map, scroll with D-pad.

Variables
s16	focusx
	Focus-point X in map pixels — the point the camera FOLLOWS (your player's position), NOT a scroll origin. mapUpdateCamera() centers the view on it with boundary clamping; passing a view origin here shifts the whole level by half a screen (see map.h).
u8	mapdata []
	Full level tilemap — 224x30 tiles, 16-bit entries (from BG1.m16).
u8	tileset []
	4bpp tileset graphics (converted from tileslevel1.png)
u8	tileset_end []
u8	tilesetatt []
	Tile collision attributes — one property byte per metatile (from .b16).
u8	tilesetdef []
	Metatile definitions — 4 tile indices per metatile (from .t16).
u8	tilesetpal []
	Tileset palette (3 palette banks x 16 colors = 96 bytes).
u8	tilesetpal_end []

Detailed Description

Tiled map editor integration with the map scrolling engine.

Demonstrates how to use maps created in the Tiled editor (https://www.mapeditor.org/) with the OpenSNES map engine. The map is a large 224x30 tile level (1792x240 pixels) stored in ROM. The map engine streams the visible 32-tile window into VRAM as the camera scrolls, so only the on-screen portion uses VRAM at any time.

The Tiled workflow:

1. Design your level in Tiled (paint tiles, set collision properties)
2. Export as .tmj (JSON) or .tmx (XML)
3. Convert with tmxconv to .m16 (tilemap) + .t16 (tile defs) + .b16 (attributes)
4. Convert tileset PNG with gfx4snes to .pic + .pal
5. Include all binaries in data.asm

This example uses pre-converted binaries. The original Tiled source file (maplevel01.tmj) is included in res/ for reference.

Ported from PVSnesLib "tiled" example by alekmaul.

SNES Concepts

• Map engine: mapLoad() / mapUpdate() / mapUpdateCamera() / mapVblank()
• Streaming tilemap: only 32 visible columns are in VRAM at any time
• SC_64x32 tilemap layout at VRAM $6800 (required by map engine)
• Tile data at VRAM $2000 (4bpp, 16-color)
• Horizontal camera scrolling with pixel-level precision
• VBlank DMA for tilemap updates (mapVblank)

What to Observe

• Press LEFT/RIGHT on D-pad to scroll through the level
• The background scrolls smoothly at 1 pixel per frame
• Notice the level is much wider than the screen (1792px vs 256px)
• The tileset uses platformer-style tiles (platforms, ladders, walls)

Modules Used

console, sprite, dma, input, background, map

See also

map.h, background.h, input.h, dma.h

Function Documentation

main()

int main

(

void

)

Entry point — initialize hardware, load map, scroll with D-pad.

Returns

Never returns (infinite game loop)

Variable Documentation

focusx

s16 focusx

Focus-point X in map pixels — the point the camera FOLLOWS (your player's position), NOT a scroll origin. mapUpdateCamera() centers the view on it with boundary clamping; passing a view origin here shifts the whole level by half a screen (see map.h).

mapdata

u8 mapdata[]

extern

Full level tilemap — 224x30 tiles, 16-bit entries (from BG1.m16).

tileset

u8 tileset[]

extern

4bpp tileset graphics (converted from tileslevel1.png)

tileset_end

u8 tileset_end[]

tilesetatt

u8 tilesetatt[]

extern

Tile collision attributes — one property byte per metatile (from .b16).

tilesetdef

u8 tilesetdef[]

extern

Metatile definitions — 4 tile indices per metatile (from .t16).

tilesetpal

u8 tilesetpal[]

extern

Tileset palette (3 palette banks x 16 colors = 96 bytes).

tilesetpal_end

u8 tilesetpal_end[]