D3D11: Made use staging buffer configurable.

src/config.h

@@ -165,6 +165,10 @@
 #	define BGFX_CONFIG_RENDERER_USE_EXTENSIONS 1
 #endif // BGFX_CONFIG_RENDERER_USE_EXTENSIONS
 
+#ifndef BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
+#	define BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER 0
+#endif // BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
+
 /// Enable use of tinystl.
 #ifndef BGFX_CONFIG_USE_TINYSTL
 #	define BGFX_CONFIG_USE_TINYSTL 1

src/renderer_d3d11.cpp

@@ -3830,7 +3830,7 @@ namespace bgfx { namespace d3d11
 		}
 		else if (m_dynamic)
 		{
-#if USE_D3D11_STAGING_BUFFER
+#if BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 			desc.Usage          = D3D11_USAGE_DEFAULT;
 			desc.CPUAccessFlags = 0;
 
@@ -3855,7 +3855,7 @@ namespace bgfx { namespace d3d11
 				, NULL
 				, &m_ptr
 				) );
-#endif // USE_D3D11_STAGING_BUFFER
+#endif // BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 		}
 		else
 		{
@@ -3887,7 +3887,7 @@ namespace bgfx { namespace d3d11
 		ID3D11DeviceContext* deviceCtx = s_renderD3D11->m_deviceCtx;
 		BX_ASSERT(m_dynamic, "Must be dynamic!");
 
-#if USE_D3D11_STAGING_BUFFER
+#if BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 		BX_UNUSED(_discard);
 
 		D3D11_MAPPED_SUBRESOURCE mapped;

src/renderer_d3d11.h

@@ -7,7 +7,6 @@
 #define BGFX_RENDERER_D3D11_H_HEADER_GUARD
 
 #define USE_D3D11_DYNAMIC_LIB    (BX_PLATFORM_LINUX || BX_PLATFORM_WINDOWS)
-#define USE_D3D11_STAGING_BUFFER 0
 
 #if !USE_D3D11_DYNAMIC_LIB
 #   undef  BGFX_CONFIG_DEBUG_ANNOTATION
@@ -81,9 +80,9 @@ namespace bgfx { namespace d3d11
 	{
 		BufferD3D11()
 			: m_ptr(NULL)
-#if USE_D3D11_STAGING_BUFFER
+#if BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 			, m_staging(NULL)
-#endif // USE_D3D11_STAGING_BUFFER
+#endif // BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 			, m_srv(NULL)
 			, m_uav(NULL)
 			, m_flags(BGFX_BUFFER_NONE)
@@ -102,18 +101,18 @@ namespace bgfx { namespace d3d11
 				m_dynamic = false;
 			}
 
-#if USE_D3D11_STAGING_BUFFER
+#if BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 			DX_RELEASE(m_staging, 0);
-#endif // USE_D3D11_STAGING_BUFFER
+#endif // BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 
 			DX_RELEASE(m_srv, 0);
 			DX_RELEASE(m_uav, 0);
 		}
 
 		ID3D11Buffer* m_ptr;
-#if USE_D3D11_STAGING_BUFFER
+#if BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 		ID3D11Buffer* m_staging;
-#endif // USE_D3D11_STAGING_BUFFER
+#endif // BGFX_CONFIG_RENDERER_DIRECT3D11_USE_STAGING_BUFFER
 		ID3D11ShaderResourceView*  m_srv;
 		ID3D11UnorderedAccessView* m_uav;
 		uint32_t m_size;