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DXIL 着色器属性和功能

着色器属性和功能（Shader Properties and Capabilities）

通过标签-值（tag-value）对列表来指定附加的着色器属性，这是入口函数描述记录中的最后一个元素。

着色器具有附加的标志，通过标签-值对来传达它们的功能，其中标签为kDxilShaderFlagsTag (0)，后面跟着一个i64位掩码整数。这些位具有以下含义：

Bit	描述
0	禁用着色器优化
1	禁用数学refactoring
2	Shader uses doubles
3	Force early depth stencil
4	Enable raw and structured buffers
5	Shader uses min-precision, expressed as half and i16
6	Shader uses double extension intrinsics
7	Shader uses MSAD
8	All resources must be bound for the duration of shader execution
9	Enable view port and RT array index from any stage feeding rasterizer
10	Shader uses inner coverage
11	Shader uses stencil
12	Shader uses intrinsics that access tiled resources
13	Shader uses relaxed typed UAV load formats
14	Shader uses Level9 comparison filtering
15	Shader uses up to 64 UAVs
16	Shader uses UAVs
17	Shader uses CS4 raw and structured buffers
18	Shader uses Rasterizer Ordered Views
19	Shader uses wave intrinsics
20	Shader uses int64 instructions

几何着色器的属性通过标签-值对来指定，标签为kDxilGSStateTag (1)，后面跟着一系列几何着色器属性。该列表的格式如下所示：

Idx	Type	描述
0	i32	Input primitive (InputPrimitive enum value).
1	i32	Max vertex count.
2	i32	Primitive topology for stream 0 (PrimitiveTopology enum value).
3	i32	Primitive topology for stream 1 (PrimitiveTopology enum value).
4	i32	Primitive topology for stream 1 (PrimitiveTopology enum value).
5	i32	Primitive topology for stream 3 (PrimitiveTopology enum value).

域着色器的属性通过标签-值对来指定，标签为kDxilDSStateTag (2)，后面跟着一系列域着色器属性。该列表的格式如下所示：

Idx	Type	描述
0	i32	Tessellator domain (TessellatorDomain enum value).
1	i32	Input control point count.

细分着色器的属性通过标签-值对来指定，标签为kDxilHSStateTag (3)，然后是一系列细分着色器属性。该列表的格式如下所示：

Idx	Type	描述
0	元数据值(MDValue)	Patch constant function (global symbol)
1	i32	Input control point count.
2	i32	Output control point count.
3	i32	Tessellator domain (TessellatorDomain enum value).
4	i32	Tessellator partitioning (TessellatorPartitioning enum value)
5	i32	Tessellator output primitive (TessellatorOutputPrimitive enum value).
6	float	Max tessellation factor.

计算着色器有以下 tag-value属性。

Tag	Value	描述
kDxilNumThreadsTag(4)	MD list: (i32, i32, i32)	Number of threads (X,Y,Z) for compute shader.
kDxilWaveSizeTag	MD list: (i32)	Wave size the shader is compatible with (optional).