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Shader "MyShader/ImageSequenceAnimation"
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{
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Properties
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{
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_Color("Color Tint",Color) = (1,1,1,1)
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_MainTex("Image Sequence", 2D) = "white" {}
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_HorizontalAmount("Horizontal Amount",Float) = 8
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_VerticalAmount("Vertical Amount",Float) = 8
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_Speed("Speed",Range(1,150)) = 30
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_ChangeTime("ChangeTime",Float) = 0
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}
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SubShader
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{
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Tags{"Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent"}
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Pass
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{
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Tags{"LightMode" = "ForwardBase"}
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ZWrite Off
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Blend SrcAlpha OneMinusSrcAlpha
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CGPROGRAM
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// 两条非常重要的编译指令
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#pragma vertex vert// 定点着色器
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#pragma fragment frag// 片元着色器
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#include "Lighting.cginc"
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fixed4 _Color;
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sampler2D _MainTex;
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float4 _MainTex_ST;
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float _HorizontalAmount;
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float _VerticalAmount;
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float _Speed;
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float _ChangeTime;
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struct a2v
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{
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float4 vertex:POSITION;
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float2 texcoord:TEXCOORD0;
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};
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struct v2f
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{
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float4 pos:SV_POSITION;
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float2 uv:TEXCOORD0;
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};
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v2f vert(a2v v)
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{
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
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return o;
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}
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fixed4 frag(v2f i) :SV_Target
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{
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//_Time float4 Time (t/20, t, t*2, t*3), use to animate things inside the shaders.
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//_SinTime float4 Sine of time: (t/8, t/4, t/2, t).
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//_CosTime float4 Cosine of time: (t/8, t/4, t/2, t).
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//unity_DeltaTime float4 Delta time: (dt, 1/dt, smoothDt, 1/smoothDt).
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//_ProjectionParams float4 x is 1.0 (or –1.0 if currently rendering with a flipped projection matrix), y is the camera’s near plane, z is the camera’s far plane and w is 1/FarPlane.
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//_ScreenParams float4 x is the current render target width in pixels, y is the current render target height in pixels, z is 1.0 + 1.0/width and w is 1.0 + 1.0/height.
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//这里的 t 得到的时间单位是——秒
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float time = floor((_Time.y - _ChangeTime) * _Speed);//对输入参数向下取整。例如 floor(float(1.3)) 返回的值为 1.0；但是 floor(float(-1.3))返回的值为-2.0。
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float row = floor(time / _HorizontalAmount);//行
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float column = time - row * _HorizontalAmount;//列
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//--
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//half2 uv = float2(i.uv.x / _HorizontalAmount, i.uv.y / _VerticalAmount);
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//uv.x += column / _HorizontalAmount;
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//uv.y -= row / _VerticalAmount;
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// --
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//--
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half2 uv = i.uv + half2(column, -row);
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uv.x /= _HorizontalAmount;
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uv.y /= _VerticalAmount;
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//--
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fixed4 c = tex2D(_MainTex, uv);
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c.rgb *= _Color;
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return c;
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}
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ENDCG
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}
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}
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Fallback "Transparent/VertexLit"
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}
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