Unity Shader实现各种进度条

1、圆形进度条shader

Shader "ProgressBar360"
{
    Properties
    {
        _BGTex("Background Texture",2D) = "white"{}
    //        [PerRendererData] 
            _MaskTex("Mask Texture", 2D) = "white" {}
            _Color("Tint", Color) = (1,1,1,1)
            _Angle("Angle", range(0,361)) = 360
            _Center("Center", vector) = (.5,.5,0,0)
            _Width("Width", float) = 1

                //        [Toggle(CLOCK_WISE)]

                        _ColorMask("Color Mask", Float) = 15

                        _MaskDetail("Mask Detail",range(0,1)) = 0.3
    }

        SubShader
            {
                Tags
                {
                    "Queue" = "Transparent"
                    "IgnoreProjector" = "True"
                    "RenderType" = "Transparent"
                    "PreviewType" = "Plane"
                    "CanUseSpriteAtlas" = "True"
                }


                Cull Off
                Lighting Off
                ZWrite Off
                ZTest[unity_GUIZTestMode]
                Blend SrcAlpha OneMinusSrcAlpha
                ColorMask[_ColorMask]

                Pass
                {
                    CGPROGRAM
                        #pragma vertex vert
                        #pragma fragment frag
                        #pragma shader_feature CLOCK_WISE

                        #include "UnityCG.cginc"

                        float _Angle;
                        float4 _Center;

                        half _Width;

                        struct appdata_t
                        {
                            float4 vertex   : POSITION;
                            float4 color    : COLOR;
                            float2 texcoord : TEXCOORD0;
                        };

                        struct v2f
                        {
                            float4 vertex   : SV_POSITION;
                            fixed4 color : COLOR;
                            half2 mask_uv  : TEXCOORD0;
                            half2 bg_uv        :TEXCOORD1;
                        };

                        fixed4 _Color;


                        bool _UseClipRect;
                        float4 _ClipRect;

                        bool _UseAlphaClip;

                        fixed _MaskDetail;

                        sampler2D _MaskTex;
                        sampler2D _BGTex;

                        float4 _MaskTex_ST;
                        float4 _BGTex_ST;

                        v2f vert(appdata_t IN)
                        {
                            v2f OUT;
                            OUT.vertex = UnityObjectToClipPos(IN.vertex);

                            OUT.mask_uv = TRANSFORM_TEX(IN.texcoord,_MaskTex);
                            OUT.bg_uv = TRANSFORM_TEX(IN.texcoord,_BGTex);

                            OUT.color = IN.color * _Color;
                            return OUT;
                        }



                        fixed4 frag(v2f IN) : SV_Target
                        {
                            half4 color = tex2D(_MaskTex, IN.mask_uv)* IN.color;
                            float2 pos = IN.mask_uv.xy - _Center.xy;


                            float ang = degrees(atan2(pos.x, -pos.y)) + 180;
                            color.a = color.a * saturate((ang - _Angle) / _Width);


                            half4 bgcolor = tex2D(_BGTex, IN.bg_uv) * IN.color;
                            float mask_a = step(_MaskDetail,color.a);//如果color.a大于0.01，返回1，小于0.01返回0，用于代替if ,判断是否透明
                            color = mask_a * color + (1 - mask_a)*bgcolor;//如果透明显示背景图，如果不透明显示遮罩图


                            return color;
                        }
                    ENDCG
                 }
            }
}

2、条形进度条shader

// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

Shader "UI/ProgressBar"
{
    Properties
    {
         _BgTex("Background Texture", 2D) = "white" {}
        _ProgressTex("Progress Texture",2D) = "gray"{}

        _ProgressValue("Progress Value",Range(0,1))=0.3

        _Color("Tint", Color) = (1,1,1,1)

        _StencilComp("Stencil Comparison", Float) = 8
        _Stencil("Stencil ID", Float) = 0
        _StencilOp("Stencil Operation", Float) = 0
        _StencilWriteMask("Stencil Write Mask", Float) = 255
        _StencilReadMask("Stencil Read Mask", Float) = 255

        _ColorMask("Color Mask", Float) = 15

        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip("Use Alpha Clip", Float) = 0
    }

        SubShader
        {
            Tags
            {
                "Queue" = "Transparent"
                "IgnoreProjector" = "True"
                "RenderType" = "Transparent"
                "PreviewType" = "Plane"
                "CanUseSpriteAtlas" = "True"
            }

            Stencil
            {
                Ref[_Stencil]
                Comp[_StencilComp]
                Pass[_StencilOp]
                ReadMask[_StencilReadMask]
                WriteMask[_StencilWriteMask]
            }

            Cull Off
            Lighting Off
            ZWrite Off
            ZTest[unity_GUIZTestMode]
            Blend SrcAlpha OneMinusSrcAlpha
            ColorMask[_ColorMask]

            Pass
            {
                Name "Default"
            CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #pragma target 2.0

                #include "UnityCG.cginc"
                #include "UnityUI.cginc"

                #pragma multi_compile __ UNITY_UI_CLIP_RECT
                #pragma multi_compile __ UNITY_UI_ALPHACLIP

                struct appdata_t
                {
                    float4 vertex   : POSITION;
                    float4 color    : COLOR;
                    float2 texcoord : TEXCOORD0;
                    UNITY_VERTEX_INPUT_INSTANCE_ID
                };

                struct v2f
                {
                    float4 vertex   : SV_POSITION;
                    fixed4 color : COLOR;
                    float2 texcoord  : TEXCOORD0;
                    float4 worldPosition : TEXCOORD1;
                    UNITY_VERTEX_OUTPUT_STEREO
                };

                fixed4 _Color;
                fixed4 _TextureSampleAdd;
                float4 _ClipRect;

                v2f vert(appdata_t v)
                {
                    v2f OUT;
                    UNITY_SETUP_INSTANCE_ID(v);
                    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
                    OUT.worldPosition = v.vertex;
                    OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

                    OUT.texcoord = v.texcoord;

                    OUT.color = v.color * _Color;
                    return OUT;
                }

                sampler2D _BgTex;
                sampler2D _ProgressTex;
                half _ProgressValue;

                fixed4 frag(v2f IN) : SV_Target
                {
                    half mask = step(_ProgressValue,IN.texcoord.y);//如果IN.texcoord.y大于_ProgressValue，返回1，小于0.01返回0，用于代替if ,判断是否透明

                    half4 color = (tex2D(_BgTex, IN.texcoord)*mask+ tex2D(_ProgressTex, IN.texcoord)*(1-mask) + _TextureSampleAdd) * IN.color;

                    #ifdef UNITY_UI_CLIP_RECT
                    color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
                    #endif

                    #ifdef UNITY_UI_ALPHACLIP
                    clip(color.a - 0.001);
                    #endif

                    return color;
                }
            ENDCG
            }
        }
}

3、通过修改UV坐标实现无限进度条

// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

Shader "UI/Default"
{
    Properties
    {
        [PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}

        _ScrollX("Base layer Scroll Speed",Float) = 1.0   // 滚动速度

        _Color("Tint", Color) = (1,1,1,1)

        _StencilComp("Stencil Comparison", Float) = 8
        _Stencil("Stencil ID", Float) = 0
        _StencilOp("Stencil Operation", Float) = 0
        _StencilWriteMask("Stencil Write Mask", Float) = 255
        _StencilReadMask("Stencil Read Mask", Float) = 255

        _ColorMask("Color Mask", Float) = 15



        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip("Use Alpha Clip", Float) = 0
    }

        SubShader
        {
            Tags
            {
                "Queue" = "Transparent"
                "IgnoreProjector" = "True"
                "RenderType" = "Transparent"
                "PreviewType" = "Plane"
                "CanUseSpriteAtlas" = "True"
            }

            Stencil
            {
                Ref[_Stencil]
                Comp[_StencilComp]
                Pass[_StencilOp]
                ReadMask[_StencilReadMask]
                WriteMask[_StencilWriteMask]
            }

            Cull Off
            Lighting Off
            ZWrite Off
            ZTest[unity_GUIZTestMode]
            Blend SrcAlpha OneMinusSrcAlpha
            ColorMask[_ColorMask]

            Pass
            {
                Name "Default"
            CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #pragma target 2.0

                #include "UnityCG.cginc"
                #include "UnityUI.cginc"

                #pragma multi_compile __ UNITY_UI_CLIP_RECT
                #pragma multi_compile __ UNITY_UI_ALPHACLIP

                struct appdata_t
                {
                    float4 vertex   : POSITION;
                    float4 color    : COLOR;
                    float2 texcoord : TEXCOORD0;
                    UNITY_VERTEX_INPUT_INSTANCE_ID
                };

                struct v2f
                {
                    float4 vertex   : SV_POSITION;
                    fixed4 color : COLOR;
                    float2 texcoord  : TEXCOORD0;
                    float4 worldPosition : TEXCOORD1;
                    UNITY_VERTEX_OUTPUT_STEREO
                };

                fixed4 _Color;
                fixed4 _TextureSampleAdd;
                float4 _ClipRect;

                float _ScrollX;

                v2f vert(appdata_t v)
                {
                    v2f OUT;
                    UNITY_SETUP_INSTANCE_ID(v);
                    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
                    OUT.worldPosition = v.vertex;
                    OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

                    OUT.texcoord = v.texcoord+ frac(float2 (_ScrollX, 0.0) * _Time.y);//延X轴移动

                    OUT.color = v.color * _Color;
                    return OUT;
                }

                sampler2D _MainTex;

                fixed4 frag(v2f IN) : SV_Target
                {
                    half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;

                    #ifdef UNITY_UI_CLIP_RECT
                    color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
                    #endif

                    #ifdef UNITY_UI_ALPHACLIP
                    clip(color.a - 0.001);
                    #endif

                    return color;
                }
            ENDCG
            }
        }
}

注意：

1、UI sprite 一定要收尾呼应，不然就会出现上图那样断层的现象。

2、将sprite的wrap mode修改为repeat，循环显示，默认的是clamp则导致uv只播一次