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);
     };
 }

Support/src/FontWriter/src/font_writer.cpp

@@ -2,7 +2,24 @@
 #include <stdio.h>
 
 namespace JabyEngine {
-    void FontWriter :: setup(SimpleTIM vram_dst, const FontInfo& font_info) {
+    struct DoubleBuffer {
+        // Hooks?
+        FontBufferInfo prim_buffer;
+
+        static constexpr DoubleBuffer empty() {
+            return DoubleBuffer{.prim_buffer = FontBufferInfo::empty()};
+        }
+
+        void setup(const FontBufferInfo& buffer_info) {
+            this->prim_buffer = buffer_info;
+        }
+    };
+
+    static auto double_buffer = DoubleBuffer::empty();
+
+    void FontWriter :: setup(const FontBufferInfo& buffer_info, SimpleTIM vram_dst, const FontInfo& font_info) {
+        double_buffer.setup(buffer_info);
+        
         printf("Hello Planschi c:\n");
     }
 }

examples/PoolBox/application/src/main.cpp

@@ -13,12 +13,13 @@ using namespace JabyEngine;
 using NewFontWriter = ::JabyEngine::FontWriter;
 
 static object::Paco  paco;
+static FontPrimitive font_buffer[2][256];
 
 static void setup() {
     static constexpr auto FontTIM = SimpleTIM(320, 0, 320, DefaultFont::Info.VRAMSize.height);
 
     DefaultFont::load(&__heap_start, FontTIM);
-    NewFontWriter::setup(FontTIM, DefaultFont::Info);
+    NewFontWriter::setup(FontBufferInfo::from(font_buffer), FontTIM, DefaultFont::Info);
 
     Assets::load_for_main();
     FontWriter::FontWriter::setup();