UUSL关键字和类型

To start and end the void Main function of the fragment shader (when you don't need to provide the output color value but depth), use the following instructions:要开始和结束片段着色器的void Main功能（当您不需要提供输出颜色值但需要提供深度时），请使用以下说明：

STRUCT_FRAG_BEGIN
STRUCT_FRAG_END

MAIN_FRAG_BEGIN(FRAGMENT_IN)
	<your code here>
MAIN_FRAG_END

警告

You should add a new line (press Enter) after closing the instruction.您应在关闭指令后添加新行（按Enter）。

This code is equivalent to:此代码等效于：

void main() {
	<your code here>
}

void main(FRAGMENT_IN IN) {
	<your code here>
}

To start and end the Main function with return value, use the following instructions:要使用返回值开始和结束Main函数，请使用以下指令：

STRUCT_FRAG_BEGIN
    INIT_COLOR(float4)
STRUCT_FRAG_END

MAIN_FRAG_BEGIN(FRAGMENT_IN)
	<your code here>
MAIN_FRAG_END

警告

You should add a new line (press Enter) after closing the instruction.您应在关闭指令后添加新行（按Enter）。

This code is equivalent to:此代码等效于：

void main() {
	<your code here>
}

FRAGMENT_OUT main(FRAGMENT_IN IN) { 
	FRAGMENT_OUT OUT;
	<your code here>
return OUT; }

To start and end the Main function of the geometry shader, use the following instructions:要启动和结束几何着色器的Main功能，请使用以下指令：

STRUCT(GEOMETRY_IN)
	INIT_POSITION
	<input members>
END

STRUCT(GEOMETRY_OUT)
	INIT_POSITION
	<output members>
END

MAIN_GEOM_BEGIN(GEOMETRY_OUT, GEOMETRY_IN)
	<your code here>
MAIN_GEOM_END

警告

You should add a new line (press Enter) after closing the instruction.您应在关闭指令后添加新行（按Enter）。

This code is equivalent to:此代码等效于：

layout(TYPE_GEOM_IN) in;
layout(TYPE_GEOM_OUT,max_vertices = MAX_VERTICES_GEOM) out;
void main() {
	<your code here>
}

[maxvertexcount(MAX_VERTICES_GEOM)]
void main(TYPE_GEOM_IN GEOMETRY_IN IN[COUNT_GEOM_IN],inout TYPE_GEOM_OUT<GEOMETRY_OUT> stream) {
	GEOMETRY_OUT OUT;
	<your code here>
}

To define a static variable, use the following syntax:要定义静态变量，请使用以下语法：

STATICVAR <your var>

This is equal to the following GLSL and HLSL commands:这等同于以下GLSL和HLSL命令：

const <your var>

static const <your var>

To work with static arrays by using UUSL, use the following instructions:要使用UUSL处理静态数组，请使用以下说明：

STATICARRAY(TYPE,NAME,SIZE)
	<your array members>
ENDARRAY

警告

You should add a new line (press Enter) after closing the instruction.您应在关闭指令后添加新行（按Enter）。

• TYPE - the type of the array (float, etc.). TYPE-数组的类型（浮点型等）。
• NAME - the name of the array. NAME-数组的名称。
• SIZE - the size of the array. SIZE-数组的大小。

This code block is equivalent to:此代码块等效于：

TYPE NAME [SIZE] = TYPE[](<your array members>);

static const TYPE NAME [SIZE] = {<your array members>};

UUSL	OpenGL	Direct3D	描述
MODIFER_LINEAR	-	linear	Interpolate between shader inputs; linear is the default value if no interpolation modifier is specified.在着色器输入之间进行插值；如果未指定插值修饰符，则linear是默认值。
MODIFER_CENTROID	-	centroid	Interpolate between samples that are somewhere within the covered area of the pixel (this may require extrapolating end points from a pixel center). Centroid sampling may improve antialiasing if a pixel is partially covered (even if the pixel center is not covered). The centroid modifier must be combined with either the linear or noperspective modifier.在像素覆盖区域内某处的样本之间进行插值（这可能需要从像素中心外推端点）。如果像素被部分覆盖（即使像素中心未被覆盖），质心采样也可以改善抗锯齿效果。质心修饰符必须与线性或非透视修饰符结合使用。
MODIFER_NOINTERPOLATION	-	nointerpolation	Do not interpolate.请勿插值。
MODIFER_NOPERSPECTIVE	-	noperspective	Do not perform perspective-correction during interpolation. The noperspective modifier can be combined with the centroid modifier.插值期间请勿执行透视校正。 noperspective修饰符可以与质心修饰符结合使用。
MODIFER_SAMPLE	-	sample	Interpolate at sample location rather than at the pixel center. This causes the pixel shader to execute per-sample rather than per-pixel.在样本位置而不是像素中心进行插值。这将导致像素着色器执行每个样本而不是每个像素。

See Also也可以看看#

In USSL structs is the way to organize the bunch of input and output data.在USSL结构中，是组织一堆输入和输出数据的方法。

To start using structs in your shader code, use the following instructions:要在着色器代码中开始使用结构，请使用以下说明：

STRUCT(NAME)
	<your data>
END

警告

You should add a new line (press Enter) after closing the instruction.您应在关闭指令后添加新行（按Enter）。

• NAME - the name of the struct. NAME-结构的名称。

Here is an example of vertex shader input struct:以下是顶点着色器输入结构的示例：

// Input vertex data
STRUCT(VERTEX_IN)
	INIT_ATTRIBUTE(float4,0,POSITION)	// Vertex position
	INIT_ATTRIBUTE(float4,1,TEXCOORD0)	// Vertex texcoord (uv)
	INIT_ATTRIBUTE(float4,2,TEXCOORD1)	// Vertex basis tangent
	INIT_ATTRIBUTE(float4,3,TEXCOORD2)	// Vertex color
END

警告

You should add a new line (press Enter) after closing the instruction.您应在关闭指令后添加新行（按Enter）。

After that, you should pass the VERTEX_IN struct to the main function of the vertex shader. 之后，应将 _ VERTEX_IN结构传递给顶点着色器的主要功能。

For using constant buffer in your shader code, use the following instructions:要在着色器代码中使用常量缓冲区，请按照以下说明进行操作：