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Shader "Tutorial/009_Color_Blending/TextureBasedBlending"{
//show values to edit in inspector
_MainTex ("Texture", 2D) = "white" {} //the base texture
_SecondaryTex ("Secondary Texture", 2D) = "black" {} //the texture to blend to
_BlendTex ("Blend Texture", 2D) = "grey" //black is the first color, white the second
//the material is completely non-transparent and is rendered at the same time as the other opaque geometry
Tags{ "RenderType"="Opaque" "Queue"="Geometry"}
//include useful shader functions
#include "UnityCG.cginc"
//define vertex and fragment shader
#pragma vertex vert
#pragma fragment frag
//the texture that's used to blend between the colors
sampler2D _BlendTex;
float4 _BlendTex_ST;
//the colors to blend between
sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _SecondaryTex;
float4 _SecondaryTex_ST;
//the object data that's put into the vertex shader
struct appdata{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
//the data that's used to generate fragments and can be read by the fragment shader
struct v2f{
float4 position : SV_POSITION;
float2 uv : TEXCOORD0;
//the vertex shader
v2f vert(appdata v){
v2f o;
//convert the vertex positions from object space to clip space so they can be rendered
o.position = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
//the fragment shader
fixed4 frag(v2f i) : SV_TARGET{
//calculate UV coordinates including tiling and offset
float2 main_uv = TRANSFORM_TEX(i.uv, _MainTex);
float2 secondary_uv = TRANSFORM_TEX(i.uv, _SecondaryTex);
float2 blend_uv = TRANSFORM_TEX(i.uv, _BlendTex);
//read colors from textures
fixed4 main_color = tex2D(_MainTex, main_uv);
fixed4 secondary_color = tex2D(_SecondaryTex, secondary_uv);
fixed4 blend_color = tex2D(_BlendTex, blend_uv);
//take the red value of the color from the blend texture
fixed blend_value = blend_color.r;
//interpolate between the colors
fixed4 col = lerp(main_color, secondary_color, blend_value);
return col;