backend-infra-engineer: Release v0.3.2 snapshot

src/zelda3/dungeon/room_layout.cc

@@ -0,0 +1,76 @@
+#include "room_layout.h"
+
+#include "absl/strings/str_format.h"
+#include "app/snes.h"
+#include "zelda3/dungeon/dungeon_rom_addresses.h"
+
+namespace yaze::zelda3 {
+
+namespace {
+constexpr uint16_t kLayerTerminator = 0xFFFF;
+
+uint16_t ReadWord(const Rom* rom, int pc_addr) {
+  const auto& data = rom->data();
+  return static_cast<uint16_t>(data[pc_addr] | (data[pc_addr + 1] << 8));
+}
+}
+
+absl::StatusOr<int> RoomLayout::GetLayoutAddress(int layout_id) const {
+  if (!rom_ || !rom_->is_loaded()) {
+    return absl::FailedPreconditionError("ROM not loaded");
+  }
+
+  if (layout_id < 0 || layout_id >= static_cast<int>(kRoomLayoutPointers.size())) {
+    return absl::InvalidArgumentError(absl::StrFormat("Invalid layout id %d", layout_id));
+  }
+
+  uint32_t snes_addr = kRoomLayoutPointers[layout_id];
+  int pc_addr = SnesToPc(static_cast<int>(snes_addr));
+  if (pc_addr < 0 || pc_addr >= static_cast<int>(rom_->size())) {
+    return absl::OutOfRangeError(absl::StrFormat("Layout pointer %d out of range", layout_id));
+  }
+  return pc_addr;
+}
+
+absl::Status RoomLayout::LoadLayout(int layout_id) {
+  objects_.clear();
+
+  auto addr_result = GetLayoutAddress(layout_id);
+  if (!addr_result.ok()) {
+    return addr_result.status();
+  }
+
+  int pos = addr_result.value();
+  const auto& rom_data = rom_->data();
+  int layer = 0;
+
+  while (pos + 2 < static_cast<int>(rom_->size())) {
+    uint8_t b1 = rom_data[pos];
+    uint8_t b2 = rom_data[pos + 1];
+
+    if (b1 == 0xFF && b2 == 0xFF) {
+      layer++;
+      pos += 2;
+      if (layer >= 3) {
+        break;
+      }
+      continue;
+    }
+
+    if (pos + 2 >= static_cast<int>(rom_->size())) {
+      break;
+    }
+
+    uint8_t b3 = rom_data[pos + 2];
+    pos += 3;
+
+    RoomObject obj = RoomObject::DecodeObjectFromBytes(b1, b2, b3, static_cast<uint8_t>(layer));
+    obj.set_rom(rom_);
+    obj.EnsureTilesLoaded();
+    objects_.push_back(obj);
+  }
+
+  return absl::OkStatus();
+}
+
+}  // namespace yaze::zelda3