feat: Introduce Dungeon Object Emulator Preview and Object Drawing Enhancements
- Added DungeonObjectEmulatorPreview for rendering dungeon objects using the SNES emulator, allowing real-time visualization of object graphics. - Implemented ObjectDrawer class to handle drawing of various object types to background buffers, utilizing game-specific patterns. - Updated DungeonCanvasViewer to integrate object rendering and improve background layer management. - Enhanced DungeonEditorV2 to support the new emulator preview, providing a more interactive editing experience. - Improved error handling and logging for better debugging during object rendering operations.
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scawful
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src/app/zelda3/dungeon/object_drawer.cc
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src/app/zelda3/dungeon/object_drawer.cc
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#include "object_drawer.h"
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#include <cstdio>
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#include "absl/strings/str_format.h"
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#include "app/gfx/snes_tile.h"
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namespace yaze {
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namespace zelda3 {
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ObjectDrawer::ObjectDrawer(Rom* rom) : rom_(rom) {}
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absl::Status ObjectDrawer::DrawObject(const RoomObject& object,
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gfx::BackgroundBuffer& bg1,
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gfx::BackgroundBuffer& bg2) {
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if (!rom_ || !rom_->is_loaded()) {
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return absl::FailedPreconditionError("ROM not loaded");
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}
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// Ensure object has tiles loaded
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auto mutable_obj = const_cast<RoomObject&>(object);
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mutable_obj.set_rom(rom_);
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mutable_obj.EnsureTilesLoaded();
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// Get tiles - silently skip objects that can't load tiles
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if (object.tiles().empty()) {
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// Many objects may not have tiles loaded yet - this is normal
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// Just skip them rather than failing the whole draw operation
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return absl::OkStatus();
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}
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const auto& tile = object.tiles()[0]; // Base tile for object
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// Select buffer based on layer
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auto& target_bg = (object.layer_ == RoomObject::LayerType::BG2) ? bg2 : bg1;
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// Dispatch to pattern-specific drawing based on object ID
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// This is reverse-engineered from the game's drawing routines
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if (object.id_ == 0x34) {
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// Object 0x34: 1x1 solid block (simplest)
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Draw1x1Solid(object, target_bg, tile);
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}
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else if (object.id_ >= 0x00 && object.id_ <= 0x08) {
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// Objects 0x00-0x08: Rightward 2x2 patterns
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DrawRightwards2x2(object, target_bg, tile);
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}
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else if (object.id_ >= 0x60 && object.id_ <= 0x68) {
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// Objects 0x60-0x68: Downward 2x2 patterns
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DrawDownwards2x2(object, target_bg, tile);
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}
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else if (object.id_ >= 0x09 && object.id_ <= 0x14) {
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// Objects 0x09-0x14: Diagonal acute patterns
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DrawDiagonalAcute(object, target_bg, tile);
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}
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else if (object.id_ >= 0x15 && object.id_ <= 0x20) {
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// Objects 0x15-0x20: Diagonal grave patterns
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DrawDiagonalGrave(object, target_bg, tile);
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}
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else if (object.id_ == 0x33 || (object.id_ >= 0x70 && object.id_ <= 0x71)) {
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// 4x4 block objects
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Draw4x4Block(object, target_bg, tile);
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}
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else {
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// Default: Draw as simple 1x1 at position
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Draw1x1Solid(object, target_bg, tile);
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}
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return absl::OkStatus();
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}
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absl::Status ObjectDrawer::DrawObjectList(
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const std::vector<RoomObject>& objects,
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gfx::BackgroundBuffer& bg1,
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gfx::BackgroundBuffer& bg2) {
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int drawn_count = 0;
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int skipped_count = 0;
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for (const auto& object : objects) {
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auto status = DrawObject(object, bg1, bg2);
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if (status.ok()) {
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drawn_count++;
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} else {
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skipped_count++;
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// Only print errors that aren't "no tiles" (which is common and expected)
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if (status.code() != absl::StatusCode::kOk) {
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// Skip silently - many objects don't have tiles loaded yet
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}
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}
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}
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if (drawn_count > 0 || skipped_count > 0) {
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printf("[ObjectDrawer] Drew %d objects, skipped %d\n", drawn_count, skipped_count);
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}
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return absl::OkStatus();
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}
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// ============================================================================
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// Pattern Drawing Implementations
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// ============================================================================
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void ObjectDrawer::Draw1x1Solid(const RoomObject& obj,
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gfx::BackgroundBuffer& bg,
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const gfx::Tile16& tile) {
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// Simple 1x1 tile placement
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WriteTile16(bg, obj.x_, obj.y_, tile);
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}
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void ObjectDrawer::DrawRightwards2x2(const RoomObject& obj,
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gfx::BackgroundBuffer& bg,
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const gfx::Tile16& tile) {
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// Pattern: Draws 2x2 tiles rightward
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// Size byte determines how many times to repeat
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int repeat_count = (obj.size_ & 0x0F) + 1; // Low nibble = width
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for (int i = 0; i < repeat_count; i++) {
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// Each iteration draws a 2x2 tile16
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int tile_x = obj.x_ + (i * 2); // Each tile16 is 2x2 8x8 tiles
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int tile_y = obj.y_;
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WriteTile16(bg, tile_x, tile_y, tile);
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}
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}
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void ObjectDrawer::DrawDownwards2x2(const RoomObject& obj,
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gfx::BackgroundBuffer& bg,
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const gfx::Tile16& tile) {
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// Pattern: Draws 2x2 tiles downward
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// Size byte determines how many times to repeat
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int repeat_count = ((obj.size_ >> 4) & 0x0F) + 1; // High nibble = height
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for (int i = 0; i < repeat_count; i++) {
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int tile_x = obj.x_;
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int tile_y = obj.y_ + (i * 2);
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WriteTile16(bg, tile_x, tile_y, tile);
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}
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}
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void ObjectDrawer::DrawDiagonalAcute(const RoomObject& obj,
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gfx::BackgroundBuffer& bg,
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const gfx::Tile16& tile) {
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// Pattern: Diagonal line going down-right (/)
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int length = (obj.size_ & 0x0F) + 1;
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for (int i = 0; i < length; i++) {
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int tile_x = obj.x_ + i;
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int tile_y = obj.y_ + i;
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WriteTile16(bg, tile_x, tile_y, tile);
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}
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}
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void ObjectDrawer::DrawDiagonalGrave(const RoomObject& obj,
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gfx::BackgroundBuffer& bg,
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const gfx::Tile16& tile) {
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// Pattern: Diagonal line going down-left (\)
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int length = (obj.size_ & 0x0F) + 1;
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for (int i = 0; i < length; i++) {
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int tile_x = obj.x_ - i;
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int tile_y = obj.y_ + i;
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WriteTile16(bg, tile_x, tile_y, tile);
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}
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}
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void ObjectDrawer::Draw4x4Block(const RoomObject& obj,
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gfx::BackgroundBuffer& bg,
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const gfx::Tile16& tile) {
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// Pattern: 4x4 tile16 block (8x8 8x8 tiles total)
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for (int yy = 0; yy < 4; yy++) {
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for (int xx = 0; xx < 4; xx++) {
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int tile_x = obj.x_ + (xx * 2);
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int tile_y = obj.y_ + (yy * 2);
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WriteTile16(bg, tile_x, tile_y, tile);
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}
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}
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}
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// ============================================================================
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// Utility Methods
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// ============================================================================
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void ObjectDrawer::WriteTile16(gfx::BackgroundBuffer& bg, int tile_x, int tile_y,
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const gfx::Tile16& tile) {
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// A Tile16 is 2x2 8x8 tiles, so we write 4 tile entries
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// Top-left (tile0)
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if (IsValidTilePosition(tile_x, tile_y)) {
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bg.SetTileAt(tile_x, tile_y, gfx::TileInfoToWord(tile.tile0_));
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}
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// Top-right (tile1)
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if (IsValidTilePosition(tile_x + 1, tile_y)) {
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bg.SetTileAt(tile_x + 1, tile_y, gfx::TileInfoToWord(tile.tile1_));
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}
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// Bottom-left (tile2)
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if (IsValidTilePosition(tile_x, tile_y + 1)) {
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bg.SetTileAt(tile_x, tile_y + 1, gfx::TileInfoToWord(tile.tile2_));
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}
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// Bottom-right (tile3)
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if (IsValidTilePosition(tile_x + 1, tile_y + 1)) {
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bg.SetTileAt(tile_x + 1, tile_y + 1, gfx::TileInfoToWord(tile.tile3_));
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}
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}
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bool ObjectDrawer::IsValidTilePosition(int tile_x, int tile_y) const {
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return tile_x >= 0 && tile_x < kMaxTilesX &&
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tile_y >= 0 && tile_y < kMaxTilesY;
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}
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} // namespace zelda3
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} // namespace yaze
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