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Refactor overworld map handling to improve custom ASM logic

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- Simplified the logic for determining custom overworld behavior based on ASM version, enhancing clarity and maintainability.
- Updated comments for better understanding of expanded tile and entrance data checks in the Overworld class.
- Ensured that expanded data checks are more straightforward, improving the overall flow of the overworld map assembly process.
This commit is contained in:
scawful
2025-09-27 17:29:56 -04:00
parent 7355294f49
commit 089a31ff92
2 changed files with 31 additions and 34 deletions
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49
src/app/zelda3/overworld/overworld.cc
View File

@@ -124,12 +124,11 @@ absl::Status Overworld::AssembleMap32Tiles() {
rom()->version_constants().kMap32TileBL,
rom()->version_constants().kMap32TileBR};
// Use ASM version to determine expanded tile32 support, with flag as override
uint8_t asm_version = (*rom_)[zelda3::OverworldCustomASMHasBeenApplied];
bool use_custom_overworld =
(asm_version != 0xFF) ||
core::FeatureFlags::get().overworld.kLoadCustomOverworld;
if (rom()->data()[kMap32ExpandedFlagPos] != 0x04 && use_custom_overworld) {
// Check if expanded tile32 data is actually present in ROM
// The flag position should contain 0x04 for vanilla, something else for expanded
uint8_t asm_version = (*rom_)[OverworldCustomASMHasBeenApplied];
if (rom()->data()[kMap32ExpandedFlagPos] != 0x04 || asm_version >= 3) {
// ROM has expanded tile32 data - use expanded addresses
map32address[0] = rom()->version_constants().kMap32TileTL;
map32address[1] = kMap32TileTRExpanded;
map32address[2] = kMap32TileBLExpanded;
@@ -137,6 +136,7 @@ absl::Status Overworld::AssembleMap32Tiles() {
num_tile32 = kMap32TileCountExpanded;
expanded_tile32_ = true;
}
// Otherwise use vanilla addresses (already set above)
// Loop through each 32x32 pixel tile in the rom
for (int i = 0; i < num_tile32; i += 6) {
@@ -178,16 +178,16 @@ absl::Status Overworld::AssembleMap16Tiles() {
int tpos = kMap16Tiles;
int num_tile16 = kNumTile16Individual;
// Use ASM version to determine expanded tile16 support, with flag as override
uint8_t asm_version = (*rom_)[zelda3::OverworldCustomASMHasBeenApplied];
bool use_custom_overworld =
(asm_version != 0xFF) ||
core::FeatureFlags::get().overworld.kLoadCustomOverworld;
if (rom()->data()[kMap16ExpandedFlagPos] != 0x0F && use_custom_overworld) {
// Check if expanded tile16 data is actually present in ROM
// The flag position should contain 0x0F for vanilla, something else for expanded
uint8_t asm_version = (*rom_)[OverworldCustomASMHasBeenApplied];
if (rom()->data()[kMap16ExpandedFlagPos] == 0x0F || asm_version >= 3) {
// ROM has expanded tile16 data - use expanded addresses
tpos = kMap16TilesExpanded;
num_tile16 = NumberOfMap16Ex;
expanded_tile16_ = true;
}
// Otherwise use vanilla addresses (already set above)
for (int i = 0; i < num_tile16; i += 1) {
ASSIGN_OR_RETURN(auto t0_data, rom()->ReadWord(tpos));
@@ -331,19 +331,17 @@ absl::Status Overworld::LoadEntrances() {
int ow_entrance_id_ptr = kOverworldEntranceEntranceId;
int num_entrances = 129;
// Use ASM version to determine expanded entrance support, with flag as override
uint8_t asm_version = (*rom_)[zelda3::OverworldCustomASMHasBeenApplied];
bool use_custom_overworld =
(asm_version != 0xFF) ||
core::FeatureFlags::get().overworld.kLoadCustomOverworld;
if (rom()->data()[kOverworldEntranceExpandedFlagPos] != 0xB8 &&
use_custom_overworld) {
// Check if expanded entrance data is actually present in ROM
// The flag position should contain 0xB8 for vanilla, something else for expanded
if (rom()->data()[kOverworldEntranceExpandedFlagPos] != 0xB8) {
// ROM has expanded entrance data - use expanded addresses
ow_entrance_map_ptr = kOverworldEntranceMapExpanded;
ow_entrance_pos_ptr = kOverworldEntrancePosExpanded;
ow_entrance_id_ptr = kOverworldEntranceEntranceIdExpanded;
expanded_entrances_ = true;
num_entrances = 256; // Expanded entrance count
}
// Otherwise use vanilla addresses (already set above)
for (int i = 0; i < num_entrances; i++) {
ASSIGN_OR_RETURN(auto map_id,
@@ -443,9 +441,9 @@ absl::Status Overworld::LoadItems() {
// Version 0x03 of the OW ASM added item support for the SW.
uint8_t asm_version = (*rom_)[zelda3::OverworldCustomASMHasBeenApplied];
// Determine max number of overworld maps based on ASM version
int max_ow =
(asm_version >= 0x03 && asm_version != 0xFF) ? kNumOverworldMaps : 0x80;
// Determine max number of overworld maps based on actual ASM version
// Only use expanded maps (0xA0) if v3+ ASM is actually applied
int max_ow = (asm_version >= 0x03 && asm_version != 0xFF) ? kNumOverworldMaps : 0x80;
ASSIGN_OR_RETURN(uint32_t pointer_snes,
rom()->ReadLong(zelda3::overworldItemsAddress));
@@ -508,13 +506,10 @@ absl::Status Overworld::LoadItems() {
absl::Status Overworld::LoadSprites() {
std::vector<std::future<absl::Status>> futures;
// Use ASM version to determine sprite table locations, with flag as override
// Determine sprite table locations based on actual ASM version in ROM
uint8_t asm_version = (*rom_)[zelda3::OverworldCustomASMHasBeenApplied];
bool use_custom_overworld =
(asm_version != 0xFF) ||
core::FeatureFlags::get().overworld.kLoadCustomOverworld;
if (use_custom_overworld && asm_version >= 3 && asm_version != 0xFF) {
if (asm_version >= 3 && asm_version != 0xFF) {
// v3: Use expanded sprite tables
futures.emplace_back(std::async(std::launch::async, [this]() {
return LoadSpritesFromMap(overworldSpritesBeginingExpanded, 64, 0);

16
src/app/zelda3/overworld/overworld_map.cc
View File

@@ -18,21 +18,23 @@ OverworldMap::OverworldMap(int index, Rom *rom)
: index_(index), parent_(index), rom_(rom) {
LoadAreaInfo();
// Use ASM version byte as source of truth, with flag as override
// Use ASM version byte as source of truth
uint8_t asm_version = (*rom_)[OverworldCustomASMHasBeenApplied];
bool use_custom_overworld = (asm_version != 0xFF) ||
core::FeatureFlags::get().overworld.kLoadCustomOverworld;
if (use_custom_overworld) {
if (asm_version == 0x00 || asm_version == 0xFF) {
// No custom ASM applied but flag enabled - set up vanilla values manually
if (asm_version != 0xFF) {
// Custom overworld ASM is applied - use custom logic
if (asm_version == 0x00) {
// Special case: version 0 means flag-enabled vanilla mode
LoadCustomOverworldData();
} else {
// Custom overworld ASM applied - set up custom tileset
SetupCustomTileset(asm_version);
}
} else if (core::FeatureFlags::get().overworld.kLoadCustomOverworld) {
// Pure vanilla ROM but flag enabled - set up custom data manually
LoadCustomOverworldData();
}
// For vanilla ROMs without flag, LoadAreaInfo already handles everything
// For pure vanilla ROMs, LoadAreaInfo already handles everything
}
absl::Status OverworldMap::BuildMap(int count, int game_state, int world,