fix bug that occured when a flush command was sent between lines 192 and 215

src/GPU3D.cpp

@@ -1570,7 +1570,7 @@ void ExecuteCommand()
             break;
 
         case 0x50: // flush
-            FlushRequest = 1;
+            FlushRequest |= 0x1;
             FlushAttributes = ExecParams[0] & 0x3;
             CycleCount = 392;
             break;
@@ -1592,7 +1592,7 @@ void ExecuteCommand()
 
 void Run(s32 cycles)
 {
-    if (FlushRequest)
+    if (FlushRequest & 0x1)
         return;
     if (CycleCount <= 0 && CmdPIPE->IsEmpty())
         return;
@@ -1635,7 +1635,7 @@ void CheckFIFODMA()
 
 void VBlank()
 {
-    if (FlushRequest)
+    if (FlushRequest & 0x1)
     {
         RenderVertexRAM = CurVertexRAM;
         RenderPolygonRAM = CurPolygonRAM;
@@ -1647,6 +1647,9 @@ void VBlank()
 
         NumVertices = 0;
         NumPolygons = 0;
+
+        FlushRequest &= ~0x1;
+        FlushRequest |= 0x2;
     }
 }
 
@@ -1655,11 +1658,11 @@ void VCount215()
     // TODO: detect other conditions that could require rerendering
     // the DS is said to present new 3D frames all the time, even if no commands are sent
 
-    if (FlushRequest)
+    if (FlushRequest & 0x2)
     {
         SoftRenderer::RenderFrame(RenderVertexRAM, RenderPolygonRAM, RenderNumPolygons);
 
-        FlushRequest = 0;
+        FlushRequest &= ~0x2;
     }
 }