From cbfc00f80ec001454db3034dfa30c2a2d0b2f1ca Mon Sep 17 00:00:00 2001
From: Triang3l <triang3l@yandex.ru>
Date: Fri, 28 Dec 2018 14:37:39 +0300
Subject: [PATCH] [D3D12] Debug option to display tessellation as wireframe

---
 src/xenia/gpu/d3d12/pipeline_cache.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/xenia/gpu/d3d12/pipeline_cache.cc b/src/xenia/gpu/d3d12/pipeline_cache.cc
index 4ee1f1461..ff4990248 100644
--- a/src/xenia/gpu/d3d12/pipeline_cache.cc
+++ b/src/xenia/gpu/d3d12/pipeline_cache.cc
@@ -26,6 +26,8 @@
 
 DEFINE_bool(d3d12_dxbc_disasm, false,
             "Disassemble DXBC shaders after generation.");
+DEFINE_bool(d3d12_tessellation_wireframe, false,
+            "Display tessellated surfaces as wireframe for debugging.");
 
 namespace xe {
 namespace gpu {
@@ -694,6 +696,11 @@ PipelineCache::UpdateStatus PipelineCache::UpdateRasterizerState(
     // Fill mode is disabled.
     fill_mode_wireframe = false;
   }
+  if (FLAGS_d3d12_tessellation_wireframe &&
+      (primitive_type == PrimitiveType::kTrianglePatch ||
+       primitive_type == PrimitiveType::kQuadPatch)) {
+    fill_mode_wireframe = true;
+  }
   dirty |= regs.fill_mode_wireframe != fill_mode_wireframe;
   regs.fill_mode_wireframe = fill_mode_wireframe;
   dirty |= regs.poly_offset != poly_offset;