【Unity Shader】第二节 为上一节课的shader增加属性

昨天的代码里讲到了Properties这个里面显示的是给Unity GUI上显示的名字，到底可以显示哪些呢？

今天的内容就是给昨天的shader增加新的功能

In our  Properties block of our Shader, remove the current property by deleting the
following code from our current Shader.
_MainTex ("Base (RGB)", 2D) = "white" {}
2. Now enter the following code, save the Shader, and re-enter the Unity editor.
_EmissiveColor ("Emissive Color", Color) = (1,1,1,1)
3. When you return to Unity, the Shader will compile and you will see that our Material's
Inspector tab now has a color swatch, named Emissive Color, instead of a texture
swatch. Let's add one more and see what happens. Enter the following code:
_AmbientColor ("Ambient Color", Range(0,10)) = 2
Chapter 1
4. We have added another Color Swatch to the Material's Inspector tab. Now let's
add one more to get a feel for other kinds of properties that we can create. Add the
following code to the properties block:
_MySliderValue ("This is a Slider", Range(0,10)) = 2.5

可以增加：

_MainTex ("Base (RGB)", 2D) = "white" {}

_AmbientColor ("Ambient Color", Color) = (1,1,1,1)

_EmissiveColor ("Emissive Color", Color) = (1,1,1,1)

_MySliderValue ("This is a Slider", Range(0,10)) = 2.5

Shader "CookbookShaders/BasicDiffuse"
{
//We define Properties in the properties block
Properties
{
_EmissiveColor ("Emissive Color", Color) = (1,1,1,1)
_AmbientColor ("Ambient Color", Color) = (1,1,1,1)
_MySliderValue ("This is a Slider", Range(0,10)) = 2.5
}
SubShader  Diffuse Shading
{
Tags { "RenderType"="Opaque" }
LOD 200
CGPROGRAM
#pragma surface surf Lambert
//We need to declare the properties variable type inside of the
CGPROGRAM so we can access its value from the properties block.
float4 _EmissiveColor;
float4 _AmbientColor;
float _MySliderValue;
struct Input
{
float2 uv_MainTex;
};
void surf (Input IN, inout SurfaceOutput o)
{
//We can then use the properties values in our shader
float4 c;
c = pow((_EmissiveColor + _AmbientColor), _MySliderValue);
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}