diff --git a/desmume/src/GPU.cpp b/desmume/src/GPU.cpp
index 6a10a0860..f2c672725 100644
--- a/desmume/src/GPU.cpp
+++ b/desmume/src/GPU.cpp
@@ -50,7 +50,7 @@
 #include "debug.h"
 #include "render3D.h"
 #include "GPU_osd.h"
-#include "debug.h"
+#include "debug.h"
 
 ARM9_struct ARM9Mem;
 
@@ -1999,7 +1999,7 @@ void GPU_set_DISPCAPCNT(u32 val)
 		case 2:
 			gpu->dispCapCnt.capx = 256;
 			gpu->dispCapCnt.capy = 128;
-			break;
+			break;
 		case 3:
 			gpu->dispCapCnt.capx = 256;
 			gpu->dispCapCnt.capy = 192;
@@ -2019,8 +2019,8 @@ BOOL bright_init=FALSE;
 
 // comment this if want to use formulas instead
 // #define BRIGHT_TABLES
-
-#ifdef BRIGHT_TABLES
+
+#ifdef BRIGHT_TABLES
 static void calc_bright_colors() {
 	int base = 31 ;
 	int factor;
@@ -2053,8 +2053,8 @@ static void calc_bright_colors() {
 
 #undef FORMULA_MORE
 #undef FORMULA_LESS
-}
-#endif
+}
+#endif
 static INLINE void GPU_ligne_layer(NDS_Screen * screen, u16 l)
 {
 	GPU * gpu = screen->gpu;
@@ -2125,13 +2125,13 @@ static INLINE void GPU_ligne_layer(NDS_Screen * screen, u16 l)
 			T2WriteWord(dst, i16 << 1, T2ReadWord(spr, i16 << 1));
 		}
 	}
-}
-
+}
+
 // TODO: capture emulated not fully
 static INLINE void GPU_ligne_DispCapture(u16 l)
 {
-	GPU * gpu = MainScreen.gpu;
-	struct _DISPCNT * dispCnt = &(gpu->dispx_st)->dispx_DISPCNT.bits;
+	GPU * gpu = MainScreen.gpu;
+	struct _DISPCNT * dispCnt = &(gpu->dispx_st)->dispx_DISPCNT.bits;
 
 	if (l == 0)
 	{
@@ -2213,10 +2213,10 @@ static INLINE void GPU_ligne_DispCapture(u16 l)
 	}
 }
 
-static INLINE void GPU_ligne_Brightness(u16 l)
+static INLINE void GPU_ligne_Brightness(NDS_Screen * screen, u16 l)
 {
-	GPU * gpu = MainScreen.gpu;
-	u8 * dst =  GPU_screen + (MainScreen.offset + l) * 512;
+	GPU * gpu = screen->gpu;
+	u8 * dst =  GPU_screen + (screen->offset + l) * 512;
 	u16 i16;
 #ifndef HAVE_LIBGDKGLEXT_X11_1_0
 // damdoum :
@@ -2375,10 +2375,8 @@ void GPU_ligne(NDS_Screen * screen, u16 l)
 	}
 
 	if (gpu->core == GPU_MAIN) 
-	{
 		GPU_ligne_DispCapture(l);
-		GPU_ligne_Brightness(l);
-	}
+	GPU_ligne_Brightness(screen, l);
 }
 
 void gpu_savestate(std::ostream* os)
@@ -2390,4 +2388,4 @@ bool gpu_loadstate(std::istream* is)
 {
 	is->read((char*)GPU_screen,sizeof(GPU_screen));
 	return !is->fail();
-}
+}
\ No newline at end of file