epic: refactor SDL2_Renderer usage to IRenderer and queued texture rendering

- Updated the testing guide to clarify the testing framework's organization and execution methods, improving user understanding.
- Refactored CMakeLists to include new platform-specific files, ensuring proper integration of the rendering backend.
- Modified main application files to utilize the new IRenderer interface, enhancing flexibility in rendering operations.
- Implemented deferred texture management in various components, allowing for more efficient graphics handling and improved performance.
- Introduced new methods for texture creation and updates, streamlining the rendering process across the application.
- Enhanced logging and error handling in the rendering pipeline to facilitate better debugging and diagnostics.

src/app/zelda3/dungeon/room.cc

@@ -321,8 +321,9 @@ void Room::RenderRoomGraphics() {
   }
   
   // CRITICAL: Recreate textures with the palette applied!
-  core::Renderer::Get().RenderBitmap(&bg1_buffer_.bitmap());
-  core::Renderer::Get().RenderBitmap(&bg2_buffer_.bitmap());
+  // TODO: Queue texture for later rendering.
+  // core::Renderer::Get().RenderBitmap(&bg1_buffer_.bitmap());
+  // core::Renderer::Get().RenderBitmap(&bg2_buffer_.bitmap());
 }
 
 void Room::RenderObjectsToBackground() {

src/app/zelda3/screen/dungeon_map.cc

@@ -8,6 +8,7 @@
 #include "app/gfx/bitmap.h"
 #include "app/gfx/snes_tile.h"
 #include "app/gfx/tilemap.h"
+#include "app/gfx/backend/irenderer.h"
 #include "app/snes.h"
 #include "util/hex.h"
 
@@ -130,7 +131,8 @@ absl::Status LoadDungeonMapTile16(gfx::Tilemap &tile16_blockset, Rom &rom,
   }
 
   tile16_blockset.atlas.SetPalette(*rom.mutable_dungeon_palette(3));
-  core::Renderer::Get().RenderBitmap(&tile16_blockset.atlas);
+  // TODO: Queue texture for later rendering.
+  // core::Renderer::Get().RenderBitmap(&tile16_blockset.atlas);
   return absl::OkStatus();
 }
 
@@ -187,7 +189,8 @@ absl::Status LoadDungeonMapGfxFromBinary(Rom &rom,
                               converted_bin.begin() + ((i + 1) * 0x1000));
       sheets[i] = gfx::Bitmap(128, 32, 8, gfx_sheets[i]);
       sheets[i].SetPalette(*rom.mutable_dungeon_palette(3));
-      core::Renderer::Get().RenderBitmap(&sheets[i]);
+      // TODO: Queue texture for later rendering.
+      // core::Renderer::Get().RenderBitmap(&sheets[i]);
     }
   }
   file.close();

src/app/zelda3/screen/inventory.cc

@@ -1,5 +1,6 @@
 #include "inventory.h"
 
+#include "app/gfx/backend/irenderer.h"
 #include "app/core/window.h"
 #include "app/gfx/bitmap.h"
 #include "app/gfx/snes_tile.h"
@@ -8,8 +9,6 @@
 namespace yaze {
 namespace zelda3 {
 
-using core::Renderer;
-
 absl::Status Inventory::Create() {
   data_.reserve(256 * 256);
   for (int i = 0; i < 256 * 256; i++) {
@@ -69,7 +68,8 @@ absl::Status Inventory::Create() {
 
   bitmap_.Create(256, 256, 8, data_);
   bitmap_.SetPalette(palette_);
-  Renderer::Get().RenderBitmap(&bitmap_);
+  // TODO: Queue texture for later rendering.
+  // Renderer::Get().RenderBitmap(&bitmap_);
   return absl::OkStatus();
 }
 
@@ -88,7 +88,8 @@ absl::Status Inventory::BuildTileset() {
   auto hud_pal_group = rom()->palette_group().hud;
   palette_ = hud_pal_group[0];
   tilesheets_bmp_.SetPalette(palette_);
-  Renderer::Get().RenderBitmap(&tilesheets_bmp_);
+  // TODO: Queue texture for later rendering.
+  // Renderer::Get().RenderBitmap(&tilesheets_bmp_);
   return absl::OkStatus();
 }