From 102f7b95e0721c32ba7909b22d82908d1563189e Mon Sep 17 00:00:00 2001
From: scawful <justin.scofield@outlook.com>
Date: Tue, 29 Apr 2025 00:09:32 -0400
Subject: [PATCH] Add Tilemap functionality with creation, updating, and
 rendering capabilities; implement data retrieval for individual tiles,
 enhancing graphics management in the application.

---
 src/app/gfx/tilemap.cc | 61 ++++++++++++++++++++++++++++++++++++++++++
 src/app/gfx/tilemap.h  | 34 +++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 src/app/gfx/tilemap.cc
 create mode 100644 src/app/gfx/tilemap.h

diff --git a/src/app/gfx/tilemap.cc b/src/app/gfx/tilemap.cc
new file mode 100644
index 00000000..8d6798b3
--- /dev/null
+++ b/src/app/gfx/tilemap.cc
@@ -0,0 +1,61 @@
+#include "app/gfx/tilemap.h"
+
+#include <vector>
+
+#include "app/core/platform/renderer.h"
+#include "app/gfx/bitmap.h"
+
+namespace yaze {
+namespace gfx {
+
+Tilemap CreateTilemap(std::vector<uint8_t> &data, int width, int height,
+                      int tile_size, int num_tiles, SnesPalette &palette) {
+  Tilemap tilemap;
+  tilemap.tile_size.x = tile_size;
+  tilemap.tile_size.y = tile_size;
+  tilemap.map_size.x = num_tiles;
+  tilemap.map_size.y = num_tiles;
+  tilemap.atlas = Bitmap(width, height, 8, data);
+  tilemap.atlas.SetPalette(palette);
+  core::Renderer::GetInstance().RenderBitmap(&tilemap.atlas);
+  return tilemap;
+}
+
+void UpdateTilemap(Tilemap &tilemap, const std::vector<uint8_t> &data) {
+  tilemap.atlas.set_data(data);
+  core::Renderer::GetInstance().UpdateBitmap(&tilemap.atlas);
+}
+
+void RenderTile(Tilemap &tilemap, int tile_id) {
+  if (tilemap.tile_bitmaps.find(tile_id) == tilemap.tile_bitmaps.end()) {
+    tilemap.tile_bitmaps[tile_id] =
+        Bitmap(tilemap.tile_size.x, tilemap.tile_size.y, 8,
+               GetTilemapData(tilemap, tile_id));
+    auto bitmap_ptr = &tilemap.tile_bitmaps[tile_id];
+    core::Renderer::GetInstance().RenderBitmap(bitmap_ptr);
+  }
+}
+
+std::vector<uint8_t> GetTilemapData(Tilemap &tilemap, int tile_id) {
+  int tile_size = tilemap.tile_size.x;
+  std::vector<uint8_t> data(tile_size * tile_size);
+
+  int num_tiles = tilemap.map_size.x;
+  int index = tile_id * tile_size * tile_size;
+  int width = tilemap.atlas.width();
+
+  for (int ty = 0; ty < tile_size; ty++) {
+    for (int tx = 0; tx < tile_size; tx++) {
+      uint8_t value =
+          tilemap.atlas
+              .vector()[(tile_id % 8 * tile_size) +
+                        (tile_id / 8 * tile_size * width) + ty * width + tx];
+      data[ty * tile_size + tx] = value;
+    }
+  }
+
+  return data;
+}
+
+}  // namespace gfx
+}  // namespace yaze
diff --git a/src/app/gfx/tilemap.h b/src/app/gfx/tilemap.h
new file mode 100644
index 00000000..52cfa134
--- /dev/null
+++ b/src/app/gfx/tilemap.h
@@ -0,0 +1,34 @@
+#ifndef YAZE_GFX_TILEMAP_H
+#define YAZE_GFX_TILEMAP_H
+
+#include "app/gfx/bitmap.h"
+#include "absl/container/flat_hash_map.h"
+
+namespace yaze {
+namespace gfx {
+
+struct Pair {
+  int x;
+  int y;
+};
+
+struct Tilemap {
+  Bitmap atlas;
+  absl::flat_hash_map<int, Bitmap> tile_bitmaps;
+  Pair tile_size;
+  Pair map_size;
+};
+
+Tilemap CreateTilemap(std::vector<uint8_t> &data, int width, int height,
+                      int tile_size, int num_tiles, SnesPalette &palette);
+
+void UpdateTilemap(Tilemap &tilemap, const std::vector<uint8_t> &data);
+
+void RenderTile(Tilemap &tilemap, int tile_id);
+
+std::vector<uint8_t> GetTilemapData(Tilemap &tilemap, int tile_id);
+
+}  // namespace gfx
+}  // namespace yaze
+
+#endif  // YAZE_GFX_TILEMAP_H