From fb4ae811d63fce5d641243dca1a6d2760e7a027b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Mon, 20 Aug 2018 05:19:09 -0700
Subject: [PATCH] D3D11: Don't use Intel extensions on Win7. Issue #1460.

---
 src/renderer_d3d11.cpp | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/src/renderer_d3d11.cpp b/src/renderer_d3d11.cpp
index b032f691b..b2a9414f0 100644
--- a/src/renderer_d3d11.cpp
+++ b/src/renderer_d3d11.cpp
@@ -519,30 +519,33 @@ namespace bgfx { namespace d3d11
 
 	static BX_NO_INLINE bool getIntelExtensions(ID3D11Device* _device)
 	{
-		uint8_t temp[28];
-
-		bx::StaticMemoryBlockWriter writer(&temp, sizeof(temp) );
-		bx::write(&writer, "INTCEXTNCAPSFUNC", 16);
-		bx::write(&writer, kIntelExtensionInterfaceVersion);
-		bx::write(&writer, UINT32_C(0) );
-		bx::write(&writer, UINT32_C(0) );
-
-		if (SUCCEEDED(setIntelExtension(_device, temp, sizeof(temp) ) ) )
+		if (windowsVersionIs(Condition::GreaterEqual, 0x0604) )
 		{
-			bx::MemoryReader reader(&temp, sizeof(temp) );
-			bx::skip(&reader, 16);
+			uint8_t temp[28];
 
-			uint32_t version;
-			bx::read(&reader, version);
+			bx::StaticMemoryBlockWriter writer(&temp, sizeof(temp) );
+			bx::write(&writer, "INTCEXTNCAPSFUNC", 16);
+			bx::write(&writer, kIntelExtensionInterfaceVersion);
+			bx::write(&writer, UINT32_C(0) );
+			bx::write(&writer, UINT32_C(0) );
 
-			uint32_t driverVersion;
-			bx::read(&reader, driverVersion);
+			if (SUCCEEDED(setIntelExtension(_device, temp, sizeof(temp) ) ) )
+			{
+				bx::MemoryReader reader(&temp, sizeof(temp) );
+				bx::skip(&reader, 16);
 
-			return version <= driverVersion;
+				uint32_t version;
+				bx::read(&reader, version);
+
+				uint32_t driverVersion;
+				bx::read(&reader, driverVersion);
+
+				return version <= driverVersion;
+			}
 		}
 
 		return false;
-	};
+	}
 
 	void resume(ID3D11Device* _device)
 	{