Don't allocate unused swap chain buffers

According to msdn.microsoft.com/en-us/library/windows/desktop/bb173075(v=vs.85).aspx the front buffer is the desktop and is not a dedicated part of the swap chain. Thus we should only need 1 swap chain buffer instead of the currently allocated 2. Samples in the DirectX SDK also only allocate just one. BUG=angle:662 Change-Id: If88eeab1954cbc92b39ac7cf42f924515c4b77f9 Reviewed-on: https://chromium-review.googlesource.com/201860Tested-by: Nicolas Capens <nicolascapens@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

Don't allocate unused swap chain buffers
673e680c · Nicolas Capens · 9cd1915c · 673e680c
Commit 673e680c authored May 28, 2014 by Nicolas Capens
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SwapChain11.cpp src/libGLESv2/renderer/d3d11/SwapChain11.cpp +3 -3

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--- a/src/libGLESv2/renderer/d3d11/SwapChain11.cpp
+++ b/src/libGLESv2/renderer/d3d11/SwapChain11.cpp
 #include "precompiled.h"
 //
-// Copyright (c) 2012-2013 The ANGLE Project Authors. All rights reserved.
+// Copyright (c) 2012-2014 The ANGLE Project Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
@@ -326,7 +326,7 @@ EGLint SwapChain11::resize(EGLint backbufferWidth, EGLint backbufferHeight)
    // Resize swap chain
    DXGI_FORMAT backbufferDXGIFormat = gl_d3d11::GetTexFormat(mBackBufferFormat, mRenderer->getCurrentClientVersion());
-    HRESULT result = mSwapChain->ResizeBuffers(2, backbufferWidth, backbufferHeight, backbufferDXGIFormat, 0);
+    HRESULT result = mSwapChain->ResizeBuffers(1, backbufferWidth, backbufferHeight, backbufferDXGIFormat, 0);
    if (FAILED(result))
    {
@@ -404,7 +404,7 @@ EGLint SwapChain11::reset(int backbufferWidth, int backbufferHeight, EGLint swap
        swapChainDesc.SampleDesc.Count = 1;
        swapChainDesc.SampleDesc.Quality = 0;
        swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
-        swapChainDesc.BufferCount = 2;
+        swapChainDesc.BufferCount = 1;
        swapChainDesc.OutputWindow = mWindow;
        swapChainDesc.Windowed = TRUE;
        swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;