main.c File Reference

Hi-res text — BG Mode 5 + interlace (512 horizontal pixels). More...

#include <snes.h>

Macros
#define	VRAM_GFX   0x8000
#define	VRAM_MAP   0x4000
	krom's VRAM layout: map at word $4000, tiles at word $8000

Functions
int	main (void)

Variables
u8	text_map []
	32x32 tilemap of 16x8 entries — 32 entries x 16px = the full 512
u8	text_map_end []
u8	text_pal []
	4 colors: black, white, cyan, gold
u8	text_pal_end []
u8	text_pic []
	410 deduplicated 8x8 subtiles (Mode 5 pairs, original art)
u8	text_pic_end []

Detailed Description

Hi-res text — BG Mode 5 + interlace (512 horizontal pixels).

Port of krom (Peter Lemon)'s InterlaceFont demo (PeterLemon/SNES, PPU/Interlace/InterlaceFont). BG Mode 5 renders 512 horizontal pixels with 16x8 tiles; SETINI bit 0 adds interlace for 448 vertical lines. The text page is original art (a procedurally rendered 512x256 text image with 1-pixel-column test bands), converted to Mode 5's paired 8x8 tile layout.

SNES Concepts

• BG Mode 5: 512px horizontal, 16x8 tiles (stored as 8x8 pairs)
• SETINI screen interlace via videoSetInterlace() (write-only shadow)
• The Mode 5 trap: content displays through MAIN AND SUB screen — both setMainScreen() and setSubScreen() are required

What to Observe

Crisp 8px-wide glyphs and 1px vertical stripe bands that a 256-wide mode cannot represent (they'd alias to solid gray).

Modules Used

console, dma, background

See also

https://github.com/PeterLemon/SNES — original demo

video.h (videoSetInterlace and the SETINI shadow)

Macro Definition Documentation

VRAM_GFX

#define VRAM_GFX   0x8000

VRAM_MAP

#define VRAM_MAP   0x4000

krom's VRAM layout: map at word $4000, tiles at word $8000

Function Documentation

main()

int main

(

void

)

Variable Documentation

text_map

u8 text_map[]

extern

32x32 tilemap of 16x8 entries — 32 entries x 16px = the full 512

text_map_end

u8 text_map_end[]

text_pal

u8 text_pal[]

extern

4 colors: black, white, cyan, gold

text_pal_end

u8 text_pal_end[]

text_pic

u8 text_pic[]

extern

410 deduplicated 8x8 subtiles (Mode 5 pairs, original art)

text_pic_end

u8 text_pic_end[]