TerrainFourLayer
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Latest revision as of 23:56, 17 January 2012
Author: Aras Pranckevicius
[edit] Description
This shader is similar to LayerShader, it just mixes four tileable textures based on RGBA channels of additional texture.
This shader requires a fragment program card to work. I'm not sure if it works correctly on GeForceFX, as they report only 4 texture units (whereas the shader needs 5).
[edit] ShaderLab - TerrainFourLayer.shader
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Shader "Terrain/Four Layer" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_MainTex ("Color 1 (RGB)", 2D) = "white" {}
_MainTex2 ("Color 2 (RGB)", 2D) = "white" {}
_MainTex3 ("Color 3 (RGB)", 2D) = "white" {}
_MainTex4 ("Color 4 (RGB)", 2D) = "white" {}
_Mask ("Mixing Mask (RGBA)", 2D) = "gray" {}
}
SubShader {
Pass {
Lighting On
Material {
Diffuse [_Color]
Ambient [_Color]
}
CGPROGRAM
// profiles arbfp1
// fragment frag
sampler2D _MainTex : register(s0);
sampler2D _MainTex2 : register(s1);
sampler2D _MainTex3 : register(s2);
sampler2D _MainTex4 : register(s3);
sampler2D _Mask : register(s4);
struct v2f {
float4 uv[5] : TEXCOORD0;
float4 diffuse : COLOR;
};
half4 frag( v2f i ) : COLOR
{
// get the four layer colors
half4 color1 = tex2D( _MainTex, i.uv[0].xy );
half4 color2 = tex2D( _MainTex2, i.uv[1].xy );
half4 color3 = tex2D( _MainTex3, i.uv[2].xy );
half4 color4 = tex2D( _MainTex4, i.uv[3].xy );
// get the mixing mask texture
half4 mask = tex2D( _Mask, i.uv[4].xy );
// mix the four layers
half4 color = color1 * mask.r + color2 * mask.g + color3 * mask.b + color4 * mask.a;
// multiply and double by the lighting
return color * i.diffuse * 2.0;
}
ENDCG
SetTexture[_MainTex] {}
SetTexture[_MainTex2] {}
SetTexture[_MainTex3] {}
SetTexture[_MainTex4] {}
SetTexture[_Mask] {}
}
}
FallBack " VertexLit", 1
}
