[GPU] VGT major mode info, swap IsPrimitiveTwoFaced arguments

src/xenia/gpu/xenos.h

@@ -36,6 +36,15 @@ enum class PrimitiveType : uint32_t {
   kQuadList = 0x0D,
   kQuadStrip = 0x0E,
   kPolygon = 0x0F,
+
+  // Starting with this primitive mode, registers like VGT_OUTPUT_PATH_CNTL have
+  // effect (deduced from R6xx/R7xx registers, and Halo 3 also doesn't reset
+  // VGT_OUTPUT_PATH_CNTL after the first draw with tessellation).
+  // TODO(Triang3l): Find out if VGT_DRAW_INITIATOR (0x21FC on Adreno 2xx, but
+  // not seen being used in games) specifies the major mode (or if it's set
+  // somewhere else).
+  kExplicitMajorModeForceStart = 0x10,
+
   k2DCopyRectListV0 = 0x10,
   k2DCopyRectListV1 = 0x11,
   k2DCopyRectListV2 = 0x12,
@@ -43,6 +52,7 @@ enum class PrimitiveType : uint32_t {
   k2DFillRectList = 0x14,
   k2DLineStrip = 0x15,
   k2DTriStrip = 0x16,
+
   // Tessellation patches (D3DTPT) when VGT_OUTPUT_PATH_CNTL & 3 is
   // VGT_OUTPATH_TESS_EN (1).
   kLinePatch = 0x10,
@@ -50,7 +60,7 @@ enum class PrimitiveType : uint32_t {
   kQuadPatch = 0x12,
 };
 
-inline bool IsPrimitiveTwoFaced(PrimitiveType type, bool tessellated) {
+inline bool IsPrimitiveTwoFaced(bool tessellated, PrimitiveType type) {
   if (tessellated) {
     return type == PrimitiveType::kTrianglePatch ||
            type == PrimitiveType::kQuadPatch;