In ARCore Unity SDK, ARBackGround shader USES the samplerExternalOES to access the camera texture, I ask this is how to achieve ? The Unity of a shader to use samplerExternalOES greet the android mobile phone camera texture, visiting (currently own android plugin, only through engage - & gt; Texture2D, again in the shader sampler2D is used to access and display the android camera texture), thank you!

Shader code is as follows, 44 exercise with uniform samplerExternalOES _MainTex;

 
The Properties {
_MainTex (" Texture ", 2 d)="white" {} 
_UvTopLeftRight (" UV of top corners ", Vector)=(0, 1, 1, 1) 
_UvBottomLeftRight (" UV of bottom corners ", Vector)=(0, 0, 1, 0) 
} 

//For GLES3 or GLES2 on device 
SubShader 
{
Pass 
{
ZWrite Off 

GLSLPROGRAM 

# pragma only_renderers gles3 gles 

# ifdef SHADER_API_GLES3 
# the extension GL_OES_EGL_image_external_essl3: the require 
# the else 
# the extension GL_OES_EGL_image_external: the require 
# endif 

Uniform vec4 _UvTopLeftRight; 
Uniform vec4 _UvBottomLeftRight; 

# ifdef VERTEX 

Varying vec2 textureCoord; 

Void main () 
{
Vec2 uvTop=mix (_UvTopLeftRight. Xy, _UvTopLeftRight. Zw, gl_MultiTexCoord0. X); 
Vec2 uvBottom=mix (_UvBottomLeftRight. Xy, _UvBottomLeftRight. Zw, gl_MultiTexCoord0. X); 
TextureCoord=mix (uvTop, uvBottom gl_MultiTexCoord0. Y); 

Gl_Position=gl_ModelViewProjectionMatrix * gl_Vertex; 
} 

# endif 

# ifdef fragments 
Varying vec2 textureCoord; 
Uniform samplerExternalOES _MainTex; 

Void main () 
{
# ifdef SHADER_API_GLES3 
Gl_FragColor=texture (_MainTex textureCoord); 
# the else 
Gl_FragColor=textureExternal (_MainTex textureCoord); 
# endif 
} 

# endif 

ENDGLSL 
} 
}