unity Kinect v2 with MS-SDK20绿屏抠像shader修改 透明背景

Shader "DX11/GreenScreenShader" {
SubShader {
//透明就需要这个
Blend SrcAlpha OneMinusSrcAlpha
Tags {"Queue"="AlphaTest" }

Pass {

CGPROGRAM
#pragma target 5.0

#pragma vertex vert
#pragma fragment frag

#include "UnityCG.cginc"

Texture2D _MainTex;

sampler SampleType;

struct vs_input {
float4 pos : POSITION;
float2 tex : TEXCOORD0;
};

StructuredBuffer<float2> depthCoordinates;
StructuredBuffer<float> bodyIndexBuffer;

struct ps_input {
float4 pos : SV_POSITION;
float2 tex : TEXCOORD0;
};

ps_input vert (vs_input v)
{
ps_input o;
o.pos = mul (UNITY_MATRIX_MVP, v.pos);
o.tex = v.tex;
// Flip x texture coordinate to mimic mirror.
o.tex.x = 1 - v.tex.x;
return o;
}

float4 frag (ps_input i, in uint id : SV_InstanceID) :COLOR
{
float4 o;

int colorWidth = (int)(i.tex.x * (float)1920);
int colorHeight = (int)(i.tex.y * (float)1080);
int colorIndex = (int)(colorWidth + colorHeight * (float)1920);

o = float4(0, 0, 0, 0);  //<-- Here I set alpha to zero in my version
// to feed into Transparent/cutout/diffuse

if ((!isinf(depthCoordinates[colorIndex].x) && !isnan(depthCoordinates[colorIndex].x) && depthCoordinates[colorIndex].x != 0) ||
!isinf(depthCoordinates[colorIndex].y) && !isnan(depthCoordinates[colorIndex].y) && depthCoordinates[colorIndex].y != 0)
{
// We have valid depth data coordinates from our coordinate mapper.  Find player mask from corresponding depth points.
float player = bodyIndexBuffer[(int)depthCoordinates[colorIndex].x + (int)(depthCoordinates[colorIndex].y * 512)];
if (player != 255)
{
o = _MainTex.Sample(SampleType, i.tex);
}else o.a = o.rgb;
}

//    float4 sampler2[9];
//    float4 minValue = float4(255,255,255,255);
//    for (int i = 0; i < 9; ++i)
//    {
//sampler2[i] = texture2D(SampleType, gl_TexCoord[0].st + tc_offset[i]);
//minValue = min(minValue, sampler2[i]);
//    }
return o;
}

ENDCG

}
}

Fallback Off
}