alpha adjustable additive blender

Hello my game is 2D game using planes with fixed z-coord
in Effects, i often using Additive Blender. (Blend one one)
but i need an additional functions : alpha-adjustable additive blender.

for EX, in code)

render.material.SetColor("_Color", new Color(1,1,1, new_alpha));

render.material.SetColor(“_Color”, new Color(1,1,1, new_alpha));

but i don’t know any shader language and i don’t know how to use unity shader.

i tried many thing.

the next is origianl code for additive is next: (and also i using it’s other versions…)

Properties {
_MainTex ("Base (RGB)", 2D) = "white" {}
}
Category 
{
	ZWrite Off
	SubShader {
		Tags { "Queue"="Transparent" }
	
		pass{
		
			// Blend SrcAlpha OneMinusSrcAlpha //AlphaBlend
			Blend One One//Additive
			// Blend One OneMinusDstColor//Soft Additive
			// Blend DstColor Zero//Multiplicative
			//Blend DstColor SrcColor//2X Multiplicative
			
			
			Material{
				Diffuse[_Color]
			}
			
			SetTexture[_MainTex] {
				combine texture
			}
		}//pass
	}//subshader
}//category

and i change it to next (for alpha adjustable)


Properties
{
	_Color ("Main Color (A=Opacity)", Color) = (1,1,1,1)
	_MainTex ("Base (RGB), Alpha (A)", 2D) = "white" {}
}
Category 
{
	ZWrite Off
	SubShader {
		Tags { "Queue"="Transparent" }
	
		pass{
		
			// Blend SrcAlpha OneMinusSrcAlpha //AlphaBlend
			Blend One One//Additive
			// Blend One OneMinusDstColor//Soft Additive
			// Blend DstColor Zero//Multiplicative
			//Blend DstColor SrcColor//2X Multiplicative
			
			
			Material{
				Diffuse[_Color]
			}
			
			SetTexture[_MainTex] {
				constantColor [_Color]
				combine texture, constant
			}
		}//pass
	}//subshader
}//category

but the alpha isn’t work.
i don’t know why this problem happen.

please help me~!

first, i’m sorry about my bad English skill.

I solved it myself.

I don’t want someone who suffered from this problem.
so i leave my solution to here:

the Blend One One dosen’t care any alpha.
you must make alpha blend option manually.

so you add this code in Blend Code :

Blend SrcAlpha DstAlpha

so, the combined texture’s alpha is working very good!