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Spriteで高さフォグもどき
Shader "TSKT/Sprites/HeightGradation"
{
Properties
{
[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
_Color ("Tint", Color) = (1,1,1,1)
[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
_GradationColor("GradationColor", Color) = (0,0,0,1)
_GradationRange("GradationRange", Vector) = (10, -10, 0.0, 0.0)
}
SubShader
{
Tags
{
"Queue"="Transparent"
"IgnoreProjector"="True"
"RenderType"="Transparent"
"PreviewType"="Plane"
"CanUseSpriteAtlas"="True"
}
Cull Off
Lighting Off
ZWrite Off
Blend One OneMinusSrcAlpha
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#pragma multi_compile _ PIXELSNAP_ON
#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
#include "UnityCG.cginc"
struct appdata_t
{
float4 vertex : POSITION;
float4 color : COLOR;
float2 texcoord : TEXCOORD0;
};
struct v2f
{
float4 vertex : SV_POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
fixed gradationIntensity : ANY;
};
fixed4 _Color;
fixed4 _GradationColor;
fixed4 _GradationRange;
v2f vert(appdata_t IN)
{
v2f OUT;
OUT.vertex = UnityObjectToClipPos(IN.vertex);
OUT.texcoord = IN.texcoord;
OUT.color = IN.color * _Color;
#ifdef PIXELSNAP_ON
OUT.vertex = UnityPixelSnap (OUT.vertex);
#endif
fixed worldPositionY = mul(unity_ObjectToWorld, IN.vertex).y;
fixed begin = _GradationRange.x;
fixed end = _GradationRange.y;
OUT.gradationIntensity = (worldPositionY - begin) / (end - begin);
return OUT;
}
sampler2D _MainTex;
sampler2D _AlphaTex;
fixed4 SampleSpriteTexture (float2 uv)
{
fixed4 color = tex2D (_MainTex, uv);
#if ETC1_EXTERNAL_ALPHA
// get the color from an external texture (usecase: Alpha support for ETC1 on android)
color.a = tex2D (_AlphaTex, uv).r;
#endif //ETC1_EXTERNAL_ALPHA
return color;
}
fixed4 frag(v2f IN) : SV_Target
{
fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;
fixed gradation = clamp(IN.gradationIntensity, 0.0, 1.0) * _GradationColor.a;
c.rgb = lerp(c.rgb, _GradationColor.rgb, gradation);
c.rgb *= c.a;
return c;
}
ENDCG
}
}
}
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