internal static bool IsFormatSupported(PixelFormat format, TextureUsage usage, MTLFeatureSupport metalFeatures)
{
switch (format)
{
case PixelFormat.BC1_Rgb_UNorm:
case PixelFormat.BC1_Rgb_UNorm_SRgb:
case PixelFormat.BC1_Rgba_UNorm:
case PixelFormat.BC1_Rgba_UNorm_SRgb:
case PixelFormat.BC2_UNorm:
case PixelFormat.BC2_UNorm_SRgb:
case PixelFormat.BC3_UNorm:
case PixelFormat.BC3_UNorm_SRgb:
case PixelFormat.BC4_UNorm:
case PixelFormat.BC4_SNorm:
case PixelFormat.BC5_UNorm:
case PixelFormat.BC5_SNorm:
case PixelFormat.BC7_UNorm:
case PixelFormat.BC7_UNorm_SRgb:
return(metalFeatures.IsSupported(MTLFeatureSet.macOS_GPUFamily1_v1) ||
metalFeatures.IsSupported(MTLFeatureSet.macOS_GPUFamily1_v2) ||
metalFeatures.IsSupported(MTLFeatureSet.macOS_GPUFamily1_v3));
case PixelFormat.ETC2_R8_G8_B8_UNorm:
case PixelFormat.ETC2_R8_G8_B8_A1_UNorm:
case PixelFormat.ETC2_R8_G8_B8_A8_UNorm:
return(metalFeatures.IsSupported(MTLFeatureSet.iOS_GPUFamily1_v1) ||
metalFeatures.IsSupported(MTLFeatureSet.iOS_GPUFamily2_v1) ||
metalFeatures.IsSupported(MTLFeatureSet.iOS_GPUFamily3_v1) ||
metalFeatures.IsSupported(MTLFeatureSet.iOS_GPUFamily4_v1));
case PixelFormat.R16_UNorm:
return(((usage & TextureUsage.DepthStencil) == 0) ||
metalFeatures.IsSupported(MTLFeatureSet.macOS_GPUFamily1_v2) ||
metalFeatures.IsSupported(MTLFeatureSet.macOS_GPUFamily1_v3));
default:
return(true);
}
}
public MTLGraphicsDevice(
GraphicsDeviceOptions options,
SwapchainDescription?swapchainDesc)
{
_device = MTLDevice.MTLCreateSystemDefaultDevice();
MetalFeatures = new MTLFeatureSupport(_device);
Features = new GraphicsDeviceFeatures(
computeShader: true,
geometryShader: false,
tessellationShaders: false,
multipleViewports: MetalFeatures.IsSupported(MTLFeatureSet.macOS_GPUFamily1_v3),
samplerLodBias: false,
drawBaseVertex: true,
drawBaseInstance: true,
drawIndirect: true,
drawIndirectBaseInstance: true,
fillModeWireframe: true,
samplerAnisotropy: true,
depthClipDisable: true,
texture1D: true, // TODO: Should be macOS 10.11+ and iOS 11.0+.
independentBlend: true,
structuredBuffer: true,
subsetTextureView: true,
commandListDebugMarkers: true,
bufferRangeBinding: true);
ResourceBindingModel = options.ResourceBindingModel;
_libSystem = new NativeLibrary("libSystem.dylib");
_concreteGlobalBlock = _libSystem.LoadFunction <IntPtr>("_NSConcreteGlobalBlock");
if (MetalFeatures.IsMacOS)
{
_completionHandler = OnCommandBufferCompleted;
}
else
{
_completionHandler = OnCommandBufferCompleted_Static;
}
_completionHandlerFuncPtr = Marshal.GetFunctionPointerForDelegate <MTLCommandBufferHandler>(_completionHandler);
_completionBlockDescriptor = Marshal.AllocHGlobal(Unsafe.SizeOf <BlockDescriptor>());
BlockDescriptor *descriptorPtr = (BlockDescriptor *)_completionBlockDescriptor;
descriptorPtr->reserved = 0;
descriptorPtr->Block_size = (ulong)Unsafe.SizeOf <BlockDescriptor>();
_completionBlockLiteral = Marshal.AllocHGlobal(Unsafe.SizeOf <BlockLiteral>());
BlockLiteral *blockPtr = (BlockLiteral *)_completionBlockLiteral;
blockPtr->isa = _concreteGlobalBlock;
blockPtr->flags = 1 << 28 | 1 << 29;
blockPtr->invoke = _completionHandlerFuncPtr;
blockPtr->descriptor = descriptorPtr;
if (!MetalFeatures.IsMacOS)
{
lock (s_aotRegisteredBlocks)
{
s_aotRegisteredBlocks.Add(_completionBlockLiteral, this);
}
}
ResourceFactory = new MTLResourceFactory(this);
_commandQueue = _device.newCommandQueue();
TextureSampleCount[] allSampleCounts = (TextureSampleCount[])Enum.GetValues(typeof(TextureSampleCount));
_supportedSampleCounts = new bool[allSampleCounts.Length];
for (int i = 0; i < allSampleCounts.Length; i++)
{
TextureSampleCount count = allSampleCounts[i];
uint uintValue = FormatHelpers.GetSampleCountUInt32(count);
if (_device.supportsTextureSampleCount((UIntPtr)uintValue))
{
_supportedSampleCounts[i] = true;
}
}
if (swapchainDesc != null)
{
SwapchainDescription desc = swapchainDesc.Value;
_mainSwapchain = new MTLSwapchain(this, ref desc);
}
PostDeviceCreated();
}
