From 624df2883a208bc966c35925a0e4b386efed184c Mon Sep 17 00:00:00 2001
From: Lephenixnoir <sebastien.michelland@protonmail.com>
Date: Fri, 17 Sep 2021 21:22:13 +0200
Subject: [PATCH] Cache accesses to VRAM (I_Flip 3.4x)

Really makes you wonder how many hours are really needed to get things
to line up properly
---
 .gitignore        | 1 +
 cgdoom/i_video.c  | 2 +-
 src-cg/platform.h | 4 +++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/.gitignore b/.gitignore
index 8ac81af..21b0da8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ build-cg/
 build-sdl2/
 wad/
 wad-edited/
+notes/
diff --git a/cgdoom/i_video.c b/cgdoom/i_video.c
index 164a6b6..e77c74b 100644
--- a/cgdoom/i_video.c
+++ b/cgdoom/i_video.c
@@ -17,7 +17,7 @@
 // $Log:$
 //
 // DESCRIPTION:
-//	DOOM graphics stuff for Nspire
+//	DOOM graphics stuff for fx-CG 50
 //
 //-----------------------------------------------------------------------------
 
diff --git a/src-cg/platform.h b/src-cg/platform.h
index e0e9386..4a40522 100644
--- a/src-cg/platform.h
+++ b/src-cg/platform.h
@@ -74,7 +74,9 @@ extern int CGD_TrustUnalignedLumps;
    use the secondary VRAM as heap. We swap because using the VRAM as heap would
    cause problems with error screens (stepping through errors would crash). */
 #ifdef CGDOOM_DIRECT_R61524
-# define CGDOOM_SCREENS_BASE ((void *)GetVRAMAddress())
+# define CGDOOM_SCREENS_BASE ((void *)( \
+       ((uint32_t)GetVRAMAddress() & 0x1fffffff) | 0x80000000 \
+   ))
 #else
 # define CGDOOM_SCREENS_BASE SaveVRAMBuffer
 #endif