Leahnaya/Poke_Transporter_GB
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Cut VRAM usage roughly in half

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Memory manufacturers and AAA game studios hate her!

With some clever rearranging, PTGB now uses only 36 KiB of the 64 KiB
BG VRAM. This means the remaining 28 KiB is free to use in the future.

Caveats: The flex tileset must not use more that 6 KiB. There is a check
for it added.

VRAM Map
  06000000 - 06000800 ( 2K): Eternal backdrop and textbox tileset
  06000800 - 06002000 ( 6K): Flex BG tileset
  06002000 - 06002400 ( 2K): BG0: Backdrop tilemap
  06002800 - 06003000 ( 2K): BG1: Flex BG tilemap
  06003000 - 06003800 ( 2K): BG2: Textbox tilemap
  06003800 - 06004000 ( 2K): BG3: Text tilemap
  06004000 -~06009000 (20K): Text rendering bitmap
  06009000 - 06010000 (28K): Free work RAM
  06010000 - 06018000 (32K): Sprite tileset

Additionally:
- Explicitly clear VRAM on boot
- Dirty workaround to fix box drawing buffer overflow.
- Flex backgrounds use a table instead of a huge switch statement
- Textbox tile IDs are now const u16[] instead of int[]
This commit is contained in:
easyaspi314
2026-07-02 16:20:19 -04:00
parent c52342816a
commit f3a164076d
30 changed files with 192 additions and 178 deletions
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27
source/text_engine.cpp
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@@ -13,9 +13,6 @@
#include "background_engine.h"
#include "pokemon_data.h"
#define TEXT_CBB 0
#define TEXT_SBB 10
script_obj curr_line;
uint char_index;
uint line_char_index;
@@ -73,17 +70,17 @@ void init_text_engine()
// Load the TTE
// tte_init_se(3, BG_CBB(TEXT_CBB) | BG_SBB(TEXT_SBB) | BG_PRIO(0), 0, CLR_WHITE, 14, &japanese_smallFont, NULL);
tte_init_chr4c(3, // BG 3
BG_CBB(TEXT_CBB) | BG_SBB(TEXT_SBB), // Charblock 0; screenblock 10
0xF000, // Screen-entry offset
bytes2word( // Color attributes:
13, // Text color
15, // Shadow color
0, // Paper
0), // Special
CLR_WHITE, // White text
BUILD_FONT, // Custom font
NULL // Use default chr4 renderer
tte_init_chr4c(3, // BG 3
BG_CBB(TILESET_TEXT) | BG_SBB(TILEMAP_TEXT), // Charblock 0; screenblock 10
0xF000, // Screen-entry offset
bytes2word( // Color attributes:
13, // Text color
15, // Shadow color
0, // Paper
0), // Special
CLR_WHITE, // White text
BUILD_FONT, // Custom font
NULL // Use default chr4 renderer
);
tte_init_con();
@@ -500,7 +497,7 @@ void scroll_text(bool instant, TTC *tc, int left, int top, int right, int bottom
// The map starts at tile 0 in the top left, increases by 1 as you go down, and then loops back at the top.
for (int i = 0; i < 30; i++)
{
tonccpy(&tile_mem[TEXT_CBB][0 + (i * 20)], &tile_mem[TEXT_CBB][2 + (i * 20)], 20 * 32);
tonccpy(&tile_mem[TILESET_TEXT][0 + (i * 20)], &tile_mem[TILESET_TEXT][2 + (i * 20)], 20 * 32);
}
// Remove text that went outside of the box and set the position