GPU: Fix mask for drawing area coordinates

src/core/gpu.h

@@ -62,6 +62,7 @@ public:
     HBLANK_TIMER_INDEX = 1,
     MAX_RESOLUTION_SCALE = 32,
     DEINTERLACE_BUFFER_COUNT = 4,
+    DRAWING_AREA_COORD_MASK = 1023,
   };
 
   enum : u16

src/core/gpu_commands.cpp

@@ -239,8 +239,8 @@ bool GPU::HandleSetTextureWindowCommand()
 bool GPU::HandleSetDrawingAreaTopLeftCommand()
 {
   const u32 param = FifoPop() & 0x00FFFFFFu;
-  const u32 left = param & VRAM_WIDTH_MASK;
-  const u32 top = (param >> 10) & VRAM_HEIGHT_MASK;
+  const u32 left = param & DRAWING_AREA_COORD_MASK;
+  const u32 top = (param >> 10) & DRAWING_AREA_COORD_MASK;
   Log_DebugPrintf("Set drawing area top-left: (%u, %u)", left, top);
   if (m_drawing_area.left != left || m_drawing_area.top != top)
   {
@@ -260,8 +260,8 @@ bool GPU::HandleSetDrawingAreaBottomRightCommand()
 {
   const u32 param = FifoPop() & 0x00FFFFFFu;
 
-  const u32 right = param & VRAM_WIDTH_MASK;
-  const u32 bottom = (param >> 10) & VRAM_HEIGHT_MASK;
+  const u32 right = param & DRAWING_AREA_COORD_MASK;
+  const u32 bottom = (param >> 10) & DRAWING_AREA_COORD_MASK;
   Log_DebugPrintf("Set drawing area bottom-right: (%u, %u)", m_drawing_area.right, m_drawing_area.bottom);
   if (m_drawing_area.right != right || m_drawing_area.bottom != bottom)
   {