From 0fb6ea819075c21cbc9b88b4e4b91c4ad138e3e9 Mon Sep 17 00:00:00 2001
From: Jaby <fenir50@web.de>
Date: Sun, 4 Feb 2024 21:43:11 -0500
Subject: [PATCH] Adjust DrawArea for NTSC

---
 src/Library/src/BootLoader/gpu_boot.cpp | 3 ++-
 src/Library/src/GPU/gpu.cpp             | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/Library/src/BootLoader/gpu_boot.cpp b/src/Library/src/BootLoader/gpu_boot.cpp
index 95d0c97e..e8713589 100644
--- a/src/Library/src/BootLoader/gpu_boot.cpp
+++ b/src/Library/src/BootLoader/gpu_boot.cpp
@@ -75,6 +75,7 @@ namespace JabyEngine {
             }
 
             void display_logo() {
+                static constexpr uint16_t TexturePageHeight = 256;
                 const auto bytes_ready = decompress_logo();
 
                 // Upload SplashScreen picture
@@ -86,7 +87,7 @@ namespace JabyEngine {
                 SJIS::load_clut(BIOS_Font::CLUTLoadPos);
 
                 // Duplicate DisplayBuffer content
-                ::JabyEngine::GPU::internal::copy_vram_to_vram({PositionU16::create(0, Display::Height), SizeU16::create(Display::Width, Display::Height)}, PositionU16::create(0, 0));
+                ::JabyEngine::GPU::internal::copy_vram_to_vram({PositionU16::create(0, TexturePageHeight), SizeU16::create(Display::Width, TexturePageHeight)}, PositionU16::create(0, 0));
 
                 Display::enable();
             }
diff --git a/src/Library/src/GPU/gpu.cpp b/src/Library/src/GPU/gpu.cpp
index 43ece9cd..85a84d1e 100644
--- a/src/Library/src/GPU/gpu.cpp
+++ b/src/Library/src/GPU/gpu.cpp
@@ -39,11 +39,13 @@ namespace JabyEngine {
             }
 
             uint32_t Display :: exchange_buffer_and_display() {
-                const uint16_t draw_area_y = (PublicDisplay::Height*PublicDisplay::current_id);
+                static constexpr uint16_t TexturePageHeight = 256;
+
+                const uint16_t draw_area_y = (TexturePageHeight*PublicDisplay::current_id);
 
                 GPU::internal::set_draw_area(GPU::PositionU16::create(0, draw_area_y));
                 PublicDisplay::current_id ^= 1;
-                GPU_IO::GP1.write(GPU_IO::Command::DisplayArea(GPU::PositionU16::create(0, static_cast<uint16_t>((PublicDisplay::Height*PublicDisplay::current_id)))));
+                GPU_IO::GP1.write(GPU_IO::Command::DisplayArea(GPU::PositionU16::create(0, static_cast<uint16_t>((TexturePageHeight*PublicDisplay::current_id)))));
                 return draw_area_y;
             }