Prepare Font double buffer

Support/include/FontWriter/Type/types.hpp

@@ -1,10 +1,27 @@
 #pragma once
 #include <PSX/File/file_types.hpp>
+#include <PSX/GPU/gpu_primitives.hpp>
 #include <PSX/GPU/gpu_types.hpp>
 
 namespace JabyEngine {
+    using FontPrimitive = GPU::SPRT::Linked;
+
     struct FontInfo {
         GPU::SizeU16 VRAMSize;
         GPU::SizeU16 FontSize;
     };
+
+    struct FontBufferInfo {
+        FontPrimitive* double_buffer[2];
+        size_t         single_buffer_length;
+
+        static constexpr FontBufferInfo empty() {
+            return FontBufferInfo{.double_buffer = {nullptr, nullptr}, .single_buffer_length = 0};
+        }
+
+        template<size_t N>
+        static constexpr FontBufferInfo from(FontPrimitive (&buffer)[2][N]) {
+            return FontBufferInfo{.double_buffer = {buffer[0], buffer[1]}, .single_buffer_length = N};
+        }
+    };
 }

Support/include/FontWriter/font_writer.hpp

@@ -3,6 +3,6 @@
 
 namespace JabyEngine {
     struct FontWriter {
-        static void setup(SimpleTIM vram_dst, const FontInfo& font_info);
+        static void setup(const FontBufferInfo& buffer_info, SimpleTIM vram_dst, const FontInfo& font_info);
     };
 }