From c852b6de349793944ee193d85825c63132723b86 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Fri, 13 Sep 2019 14:38:51 +0200
Subject: [PATCH] [d3d11] Optimize viewport updates if there is only one single
 viewport

---
 src/d3d11/d3d11_context.cpp | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/src/d3d11/d3d11_context.cpp b/src/d3d11/d3d11_context.cpp
index e5d94802..210fee95 100644
--- a/src/d3d11/d3d11_context.cpp
+++ b/src/d3d11/d3d11_context.cpp
@@ -3219,16 +3219,27 @@ namespace dxvk {
       }
     }
     
-    EmitCs([
-      cViewportCount = viewportCount,
-      cViewports     = viewports,
-      cScissors      = scissors
-    ] (DxvkContext* ctx) {
-      ctx->setViewports(
-        cViewportCount,
-        cViewports.data(),
-        cScissors.data());
-    });
+    if (likely(viewportCount == 1)) {
+      EmitCs([
+        cViewport = viewports[0],
+        cScissor  = scissors[0]
+      ] (DxvkContext* ctx) {
+        ctx->setViewports(1,
+          &cViewport,
+          &cScissor);
+      });
+    } else {
+      EmitCs([
+        cViewportCount = viewportCount,
+        cViewports     = viewports,
+        cScissors      = scissors
+      ] (DxvkContext* ctx) {
+        ctx->setViewports(
+          cViewportCount,
+          cViewports.data(),
+          cScissors.data());
+      });
+    }
   }