我使用CheckMultisampleQualityLevels(...)在我的硬件上建立MSAA支持。我是按照这个顺序做的：
D3D11CreateDevice(...)给了我device device->CheckMultisampleQualityLevels(...) DXGI_SWAP_CHAIN_DESC.SampleDesc CreateSwapChain(...) 的DXGI_SWAP_CHAIN_DESC
问题是，CheckMultisampleQualityLevels(...) 总是为0提供pNumQualityLevels 。而且我确信我的显卡支持一些MSAA（我已经在GeForce gtx 780上测试了这个程序，其他人也得到了相同的结果）。
我错过了什么吗？我应该在 CheckMultisampleQualityLevels(...)
代码：
创建设备：
UINT createDeviceFlags = 0;
#ifdef DEBUG_DIRECTX
createDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG;
#endif
D3D_DRIVER_TYPE driverTypes[] = {
D3D_DRIVER_TYPE_HARDWARE,
D3D_DRIVER_TYPE_WARP,
D3D_DRIVER_TYPE_REFERENCE,
};
std::string driverTypesNames[] = {
"D3D_DRIVER_TYPE_HARDWARE",
"D3D_DRIVER_TYPE_WARP",
"D3D_DRIVER_TYPE_REFERENCE",
};
UINT numDriverTypes = ARRAYSIZE(driverTypes);
D3D_FEATURE_LEVEL featureLevels[] = {
D3D_FEATURE_LEVEL_11_0,
D3D_FEATURE_LEVEL_10_1,
D3D_FEATURE_LEVEL_10_0,
};
std::string featureLevelsNames[] = {
"D3D_FEATURE_LEVEL_11_0",
"D3D_FEATURE_LEVEL_10_1",
"D3D_FEATURE_LEVEL_10_0",
};
UINT numFeatureLevels = ARRAYSIZE(featureLevels);
D3D_FEATURE_LEVEL g_featureLevel = D3D_FEATURE_LEVEL_11_0;
for(UINT driverTypeIndex = 0; driverTypeIndex < numDriverTypes; driverTypeIndex++){
driverType = driverTypes[driverTypeIndex];
result = D3D11CreateDevice(NULL, driverType, NULL, createDeviceFlags, featureLevels, numFeatureLevels, D3D11_SDK_VERSION, &device, &g_featureLevel, &context);
if(SUCCEEDED(result)){
LOG(logDEBUG1, "Driver type: " << driverTypesNames[driverTypeIndex] << ".", MOD_GRAPHIC);
break;
}
}
ERROR_HANDLE(SUCCEEDED(result), L"Could not create device (DirectX 11).", MOD_GRAPHIC);
检查多样本质量水平（基于vertexwahn.de article）：
sampleCountOut = 1;
maxQualityLevelOut = 0;
for(UINT sampleCount = 1; sampleCount <= D3D11_MAX_MULTISAMPLE_SAMPLE_COUNT; sampleCount++){
UINT maxQualityLevel = 0;
HRESULT hr = device->CheckMultisampleQualityLevels(DXGI_FORMAT_R8G8B8A8_UNORM, sampleCount, &maxQualityLevel);
if(maxQualityLevel > 0){
maxQualityLevel--;
}
ERROR_HANDLE(hr == S_OK, L"CheckMultisampleQualityLevels failed.", MOD_GRAPHIC);
if(maxQualityLevel > 0){
LOG(logDEBUG1, "MSAA " << sampleCount << "X supported with " << maxQualityLevel << " quality levels.", MOD_GRAPHIC);
sampleCountOut = sampleCount;
maxQualityLevelOut = maxQualityLevel;
}
}
交换链：
DXGI_SWAP_CHAIN_DESC sd;
ZeroMemory(&sd, sizeof(sd));
sd.BufferCount = 1;
sd.BufferDesc.Width = width;
sd.BufferDesc.Height = height;
sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
sd.BufferDesc.RefreshRate.Numerator = 60;
sd.BufferDesc.RefreshRate.Denominator = 1;
sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
sd.OutputWindow = *hwnd;
sd.SampleDesc.Count = sampleCount;
sd.SampleDesc.Quality = maxQualityLevel;
sd.Windowed = false;
sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH; // allow full-screen switchin
//based on http://stackoverflow.com/questions/27270504/directx-creating-the-swapchain
IDXGIDevice * dxgiDevice = 0;
HRESULT hr = device->QueryInterface(__uuidof(IDXGIDevice), (void **)& dxgiDevice);
ERROR_HANDLE(SUCCEEDED(hr), L"Query for IDXGIDevice failed.", MOD_GRAPHIC);
IDXGIAdapter * dxgiAdapter = 0;
hr = dxgiDevice->GetParent(__uuidof(IDXGIAdapter), (void **)& dxgiAdapter);
ERROR_HANDLE(SUCCEEDED(hr), L"Could not get IDXGIAdapter.", MOD_GRAPHIC);
IDXGIFactory * dxgiFactory = 0;
hr = dxgiAdapter->GetParent(__uuidof(IDXGIFactory), (void **)& dxgiFactory);
ERROR_HANDLE(SUCCEEDED(hr), L"Could not get IDXGIFactory.", MOD_GRAPHIC);
// This system only has DirectX 11.0 installed (let's assume it)
result = dxgiFactory->CreateSwapChain(device, &sd, &swapChain);
LOG(logDEBUG1, "This system only has DirectX 11.0 installed. CreateSwapChain(...) used.", MOD_GRAPHIC);
ERROR_HANDLE(result == S_OK, L"Could not swap chain.", MOD_GRAPHIC);
我的ERROR_HANDLE(...)宏永远不会触发（第一个参数在所有情况下都为真）。日志说我使用D3D_DRIVER_TYPE_HARDWARE作为驱动程序类型。
DirectX调试器说（这是一个问题，但我不认为这是CheckMultisampleQualityLevels(...)给我错误结果的原因）：
DXGI警告：IDXGISwapChain ::目前：由于应用程序未正确使用IDXGISwapChain :: ResizeBuffers而导致全屏显示效率低下，指定IDXGIOutput :: GetDisplayModeList中不可用的DXGI_MODE_DESC，或者未使用DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH.DXGI_SWAP_CHAIN_DESC :: BufferDesc = {1600， 900，{60,1}，R8G8B8A8_UNORM，0,0}; DXGI_SWAP_CHAIN_DESC :: SampleDesc = {8,0}; DXGI_SWAP_CHAIN_DESC :: Flags = 0x2; [其他警告＃98：]
答案 0 :(得分：1)
您的代码在检查是否大于零之前从maxQualityLevels中减去1。初始值为1表示在质量等级0创建目标是有效的。
假设您希望这适用于供应商，您只需要检查它是否为＆gt; 0，然后在Quality = 0处创建表面。
质量水平＆gt; 0是供应商特定的，可以表示不同GPU的任意数量的东西。 Nvidia的CSAA和AMD的EQAA都可以通过非零质量水平获得，但您需要查看自己的文档，以确定每个质量水平的实际含义。它们在功能上与传统的MSAA略有不同。 “质量”有点误导，因为更多的数字并不一定意味着更高的质量，把它称为“模式”更合适
见两者：
http://www.nvidia.com/object/coverage-sampled-aa.html
和