From 47c15995b0a92b55272accea2b4033bc4872c46c Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Thu, 31 Aug 2023 23:51:19 +0300
Subject: [PATCH] gpu: handle wrapping somewhat

instead of crashing outright
---
 plugins/gpu_neon/psx_gpu/psx_gpu.c | 22 ++++++++++++++++++++--
 plugins/gpu_neon/psx_gpu_if.c      |  1 +
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/plugins/gpu_neon/psx_gpu/psx_gpu.c b/plugins/gpu_neon/psx_gpu/psx_gpu.c
index 370d8f2a..af24e770 100644
--- a/plugins/gpu_neon/psx_gpu/psx_gpu.c
+++ b/plugins/gpu_neon/psx_gpu/psx_gpu.c
@@ -260,8 +260,8 @@ u32 invalidate_texture_cache_region_viewport(psx_gpu_struct *psx_gpu, u32 x1,
   return mask;
 }
 
-void update_texture_cache_region(psx_gpu_struct *psx_gpu, u32 x1, u32 y1,
- u32 x2, u32 y2)
+static void update_texture_cache_region_(psx_gpu_struct *psx_gpu,
+ u32 x1, u32 y1, u32 x2, u32 y2)
 {
   u32 mask = texture_region_mask(x1, y1, x2, y2);
   u32 texture_page;
@@ -313,6 +313,22 @@ void update_texture_cache_region(psx_gpu_struct *psx_gpu, u32 x1, u32 y1,
   }
 }
 
+void update_texture_cache_region(psx_gpu_struct *psx_gpu, u32 x1, u32 y1,
+ u32 x2, u32 y2)
+{
+  s32 w = x2 - x1;
+  do
+  {
+    x2 = x1 + w;
+    if (x2 > 1023)
+      x2 = 1023;
+    update_texture_cache_region_(psx_gpu, x1, y1, x2, y2);
+    w -= x2 - x1;
+    x1 = 0;
+  }
+  while (unlikely(w > 0));
+}
+
 #ifndef NEON_BUILD
 
 void update_texture_4bpp_cache(psx_gpu_struct *psx_gpu)
@@ -5057,3 +5073,5 @@ void triangle_benchmark(psx_gpu_struct *psx_gpu)
 #endif
 
 #include "psx_gpu_4x.c"
+
+// vim:ts=2:sw=2:expandtab
diff --git a/plugins/gpu_neon/psx_gpu_if.c b/plugins/gpu_neon/psx_gpu_if.c
index 69a2a1bb..4a8b76fc 100644
--- a/plugins/gpu_neon/psx_gpu_if.c
+++ b/plugins/gpu_neon/psx_gpu_if.c
@@ -151,6 +151,7 @@ sync_enhancement_buffers(int x, int y, int w, int h)
     }
 
     x += (w1 + s) * step_x;
+    x &= 0x3ff;
     x_buf = 0;
   }
 }
-- 
2.39.2