Exemples de Shader Unity

// Unity Basic Shaders - HLSL/Cg

// 1. Basic Diffuse Shader
Shader "Custom/BasicDiffuse"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf Lambert

        sampler2D _MainTex;
        fixed4 _Color;

        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    Fallback "Diffuse"
}

// 2. Lambert Lighting with Custom Properties
Shader "Custom/CustomLambert"
{
    Properties
    {
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _Emission ("Emission", Color) = (0,0,0,1)
        _Glossiness ("Glossiness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows
        #pragma target 3.0

        sampler2D _MainTex;
        fixed4 _Color;
        half _Glossiness;
        half _Metallic;
        fixed4 _Emission;

        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            o.Normal = fixed3(0,0,1);
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Emission = _Emission.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    Fallback "Standard"
}

// 3. Transparent Shader with Alpha
Shader "Custom/Transparent"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _Alpha ("Alpha", Range(0,1)) = 1.0
    }

    SubShader
    {
        Tags {
            "Queue"="Transparent"
            "RenderType"="Transparent"
        }

        LOD 100
        Blend SrcAlpha OneMinusSrcAlpha
        ZWrite Off
        Cull Off

        CGPROGRAM
        #pragma surface surf Lambert alpha:fade

        sampler2D _MainTex;
        fixed4 _Color;
        float _Alpha;

        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            o.Alpha = c.a * _Alpha;
        }
        ENDCG
    }
}

// 4. Rim Lighting Shader
Shader "Custom/RimLighting"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _RimColor ("Rim Color", Color) = (0,0.5,1,1)
        _RimPower ("Rim Power", Range(0,8)) = 3.0
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf Lambert

        sampler2D _MainTex;
        fixed4 _Color;
        fixed4 _RimColor;
        float _RimPower;

        struct Input
        {
            float2 uv_MainTex;
            float3 viewDir;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;

            // Rim lighting
            half rim = 1.0 - saturate(dot (normalize(IN.viewDir), o.Normal));
            o.Emission = _RimColor.rgb * pow (rim, _RimPower);
            o.Alpha = c.a;
        }
        ENDCG
    }
    Fallback "Diffuse"
}

// 5. Toon/Cel Shading Shader
Shader "Custom/ToonShader"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _Ramp ("Toon Ramp", 2D) = "gray" {}
        _OutlineColor ("Outline Color", Color) = (0,0,0,1)
        _Outline ("Outline Width", Range(0,0.1)) = 0.02
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }
        UsePass "Toon/OUTLINE"

        CGPROGRAM
        #pragma surface surf Toon

        sampler2D _MainTex;
        sampler2D _Ramp;
        fixed4 _Color;

        struct Input
        {
            float2 uv_MainTex;
        };

        inline fixed4 LightingToon (SurfaceOutput s, half3 lightDir, half3 viewDir, half atten)
        {
            half d = dot (s.Normal, lightDir) * 0.5 + 0.5;
            fixed3 ramp = tex2D (_Ramp, fixed2(d,d)).rgb;
            fixed4 c;
            c.rgb = s.Albedo * _LightColor0.rgb * ramp * atten;
            c.a = s.Alpha;
            return c;
        }

        void surf (Input IN, inout SurfaceOutput o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }

    Fallback "Diffuse"
}

// 6. Scrolling Texture Shader
Shader "Custom/ScrollingTexture"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _ScrollX ("Scroll X Speed", float) = 0.1
        _ScrollY ("Scroll Y Speed", float) = 0.0
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf Lambert

        sampler2D _MainTex;
        fixed4 _Color;
        float _ScrollX;
        float _ScrollY;

        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            float2 scrolledUV = IN.uv_MainTex;
            scrolledUV.x += _Time.y * _ScrollX;
            scrolledUV.y += _Time.y * _ScrollY;

            fixed4 c = tex2D (_MainTex, scrolledUV) * _Color;
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    Fallback "Diffuse"
}

// 7. Dissolve Shader
Shader "Custom/Dissolve"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _DissolveTex ("Dissolve Texture", 2D) = "white" {}
        _DissolveAmount ("Dissolve Amount", Range(0,1)) = 0.0
        _EdgeColor ("Edge Color", Color) = (1,0,0,1)
        _EdgeWidth ("Edge Width", Range(0,0.1)) = 0.01
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf Lambert

        sampler2D _MainTex;
        sampler2D _DissolveTex;
        fixed4 _Color;
        float _DissolveAmount;
        fixed4 _EdgeColor;
        float _EdgeWidth;

        struct Input
        {
            float2 uv_MainTex;
            float2 uv_DissolveTex;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            float dissolve = tex2D (_DissolveTex, IN.uv_DissolveTex).r;

            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;

            if (dissolve < _DissolveAmount)
            {
                clip (-1);
            }

            // Edge effect
            if (dissolve < _DissolveAmount + _EdgeWidth)
            {
                c = _EdgeColor;
            }

            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    Fallback "Diffuse"
}

// 8. Glass/Refraction Shader
Shader "Custom/Glass"
{
    Properties
    {
        _MainTex ("Main Texture", 2D) = "white" {}
        _BumpMap ("Normal Map", 2D) = "bump" {}
        _Color ("Color", Color) = (1,1,1,1)
        _RefractAmount ("Refraction Amount", Range(0,1)) = 0.5
        _Glossiness ("Glossiness", Range(0,1)) = 0.8
    }

    SubShader
    {
        Tags {
            "Queue"="Transparent"
            "RenderType"="Opaque"
        }

        GrabPass {}

        CGPROGRAM
        #pragma surface surf Standard alpha
        #pragma target 3.0

        sampler2D _MainTex;
        sampler2D _BumpMap;
        sampler2D _GrabTexture;
        fixed4 _Color;
        float _RefractAmount;
        half _Glossiness;

        struct Input
        {
            float2 uv_MainTex;
            float2 uv_BumpMap;
            float4 screenPos;
        };

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;

            // Refraction
            float3 normal = UnpackNormal(tex2D (_BumpMap, IN.uv_BumpMap));
            float2 offset = normal.xy * _RefractAmount;
            IN.screenPos.xy += offset;

            half3 grabColor = tex2Dproj(_GrabTexture, IN.screenPos).rgb;

            o.Albedo = c.rgb;
            o.Emission = grabColor * _RefractAmount;
            o.Smoothness = _Glossiness;
            o.Normal = normal;
            o.Alpha = c.a * 0.8;
        }
        ENDCG
    }
    Fallback "Transparent/Cutout/VertexLit"
}

// 9. Vertex/Fragment Shader - Basic Unlit
Shader "Custom/BasicUnlit"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            fixed4 _Color;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv) * _Color;
                return col;
            }
            ENDCG
        }
    }
}

// 10. Vertex Color Shader
Shader "Custom/VertexColor"
{
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                fixed4 color : COLOR;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                fixed4 color : COLOR;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.color = v.color;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                return i.color;
            }
            ENDCG
        }
    }
}

// Advanced Unity Shaders - HLSL/Cg

// 1. Parallax Occlusion Mapping Shader
Shader "Custom/ParallaxOcclusion"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _BumpMap ("Normal Map", 2D) = "bump" {}
        _ParallaxMap ("Height Map", 2D) = "black" {}
        _Parallax ("Height Scale", Range(0.005, 0.08)) = 0.02
        _ParallaxMaxSteps ("Max Steps", Range(1, 50)) = 20
        _ParallaxRefractionSteps ("Refraction Steps", Range(1, 20)) = 10
        _Color ("Color", Color) = (1,1,1,1)
        _Metallic ("Metallic", Range(0,1)) = 0.0
        _Glossiness ("Glossiness", Range(0,1)) = 0.5
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 300

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows
        #pragma target 3.0
        #pragma shader_feature _PARALLAX_MAP

        sampler2D _MainTex;
        sampler2D _BumpMap;
        sampler2D _ParallaxMap;
        fixed4 _Color;
        half _Metallic;
        half _Glossiness;
        float _Parallax;
        int _ParallaxMaxSteps;
        int _ParallaxRefractionSteps;

        struct Input
        {
            float2 uv_MainTex;
            float2 uv_BumpMap;
            float2 uv_ParallaxMap;
            float3 viewDir;
        };

        #if defined(_PARALLAX_MAP)
            float2 ParallaxOffset(float2 uv, float3 viewDir)
            {
                float h = tex2D(_ParallaxMap, uv).r;
                float height = h * _Parallax;
                float2 offset = viewDir.xy / (viewDir.z + 0.42);
                return uv - offset * height;
            }

            float2 RaymarchParallax(float2 uv, float3 viewDir)
            {
                float2 offset = 0;
                float stepSize = 1.0 / _ParallaxMaxSteps;

                for(int i = 0; i < _ParallaxMaxSteps; i++)
                {
                    float h = tex2D(_ParallaxMap, uv + offset).r;
                    float height = h * _Parallax;

                    if(height > (float)i / _ParallaxMaxSteps)
                    {
                        offset -= viewDir.xy / viewDir.z * stepSize * _Parallax;
                    }
                    else
                    {
                        break;
                    }
                }

                return uv + offset;
            }
        #endif

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            #if defined(_PARALLAX_MAP)
                float2 uv = RaymarchParallax(IN.uv_ParallaxMap, IN.viewDir);
            #else
                float2 uv = IN.uv_MainTex;
            #endif

            fixed4 c = tex2D (_MainTex, uv) * _Color;
            o.Albedo = c.rgb;
            o.Normal = UnpackNormal(tex2D (_BumpMap, uv));
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG
    }
    Fallback "Standard"
}

// 2. Tessellation Shader
Shader "Custom/Tessellation"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _Tessellation ("Tessellation", Range(1,32)) = 4
        _MinDistance ("Min Distance", Range(1,20)) = 10
        _MaxDistance ("Max Distance", Range(20,100)) = 50
        _EdgeLength ("Edge Length", Range(2,50)) = 15
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows vertex:disp tessellate:tessEdge nolightmap
        #pragma hull hull_shader
        #pragma domain domain_shader
        #pragma target 4.6

        sampler2D _MainTex;
        fixed4 _Color;
        float _Tessellation;
        float _MinDistance;
        float _MaxDistance;
        float _EdgeLength;

        struct appdata
        {
            float4 vertex : POSITION;
            float3 normal : NORMAL;
            float2 uv : TEXCOORD0;
        };

        struct v2f
        {
            float4 vertex : SV_POSITION;
            float3 normal : NORMAL;
            float2 uv : TEXCOORD0;
        };

        float4 disp (appdata v)
        {
            return v.vertex;
        }

        v2f vert (appdata v)
        {
            v2f o;
            o.vertex = UnityObjectToClipPos(v.vertex);
            o.normal = v.normal;
            o.uv = v.uv;
            return o;
        }

        #ifdef UNITY_CAN_COMPILE_TESSELLATION
            struct TessellationFactors
            {
                float edge[3] : SV_TessFactor;
                float inside : SV_InsideTessFactor;
            };

            struct HS_CONSTANT_OUTPUT
            {
                float edges[3] : SV_TessFactor;
                float inside : SV_InsideTessFactor;
            };

            HS_CONSTANT_OUTPUT hsConstant (InputPatch<appdata,3> v)
            {
                HS_CONSTANT_OUTPUT o;

                float4 p0 = UnityObjectToViewPos(v[0].vertex);
                float4 p1 = UnityObjectToViewPos(v[1].vertex);
                float4 p2 = UnityObjectToViewPos(v[2].vertex);

                float d0 = length(p0.xyz);
                float d1 = length(p1.xyz);
                float d2 = length(p2.xyz);

                float minDist = min(min(d0, d1), d2);
                float maxDist = max(max(d0, d1), d2);

                float dist = saturate((minDist - _MinDistance) / (_MaxDistance - _MinDistance));
                float factor = lerp(_Tessellation, 1, dist);

                o.edges[0] = factor;
                o.edges[1] = factor;
                o.edges[2] = factor;
                o.inside = factor;

                return o;
            }

            [domain("tri")]
            [partitioning("fractional_odd")]
            [outputtopology("triangle_cw")]
            [outputcontrolpoints(3)]
            [patchconstantfunc("hsConstant")]
            TessellationFactors hs (InputPatch<appdata,3> i, uint patchID : SV_PrimitiveID)
            {
                TessellationFactors o;
                o.edge[0] = 4;
                o.edge[1] = 4;
                o.edge[2] = 4;
                o.inside = 4;
                return o;
            }

            struct HS_OUTPUT
            {
                float4 vertex : SV_POSITION;
                float3 normal : NORMAL;
                float2 uv : TEXCOORD0;
            };

            [domain("tri")]
            DS_OUTPUT ds (TessellationFactors factors, OutputPatch<HS_OUTPUT,3> patch, float3 bary : SV_DomainLocation)
            {
                DS_OUTPUT o;

                float3 vertex =
                    patch[0].vertex * bary.x +
                    patch[1].vertex * bary.y +
                    patch[2].vertex * bary.z;

                float3 normal =
                    patch[0].normal * bary.x +
                    patch[1].normal * bary.y +
                    patch[2].normal * bary.z;

                float2 uv =
                    patch[0].uv * bary.x +
                    patch[1].uv * bary.y +
                    patch[2].uv * bary.z;

                o.vertex = vertex;
                o.normal = normal;
                o.uv = uv;

                return o;
            }
        #endif

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv) * _Color;
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    Fallback "Standard"
}

// 3. Fur Shader
Shader "Custom/Fur"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _FurLength ("Fur Length", Range(0.1, 1)) = 0.5
        _FurDensity ("Fur Density", Range(0.01, 1)) = 0.3
        _FurTiling ("Fur Tiling", float) = 1.0
        _FurGravity ("Gravity Force", Range(0,1)) = 0.5
        _FurColor ("Fur Color", Color) = (1,1,1,1)
        _Layers ("Layer Count", Range(1, 100)) = 20
    }

    SubShader
    {
        Tags { "RenderType"="TransparentCutout" }
        LOD 200
        Cull Off

        CGPROGRAM
        #pragma surface surf Lambert vertex:vert alpha:fade
        #pragma shader_feature _FURSHADER_ON

        sampler2D _MainTex;
        fixed4 _Color;
        float _FurLength;
        float _FurDensity;
        float _FurTiling;
        float _FurGravity;
        fixed4 _FurColor;
        int _Layers;

        struct Input
        {
            float2 uv_MainTex;
            float furLayer;
        };

        void vert(inout appdata_full v, out Input o)
        {
            UNITY_INITIALIZE_OUTPUT(Input);
            o.uv_MainTex = v.texcoord;
            o.furLayer = v.color.r; // Pass layer from vertex color
        }

        void surf (Input IN, inout SurfaceOutput o)
        {
            float2 uv = IN.uv_MainTex * _FurTiling + float2(IN.furLayer * 0.2, IN.furLayer * 0.3);
            float4 fur = tex2D(_MainTex, uv);

            // Alpha based on fur density and layer
            float alpha = fur.r;
            alpha = smoothstep(_FurDensity * (1.0 - IN.furLayer), 1.0, alpha);

            // Fur color variation
            fixed4 furColor = lerp(_Color, _FurColor, IN.furLayer * 0.5);

            o.Albedo = furColor.rgb;
            o.Alpha = alpha * (1.0 - IN.furLayer);
        }
        ENDCG

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

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                float3 normal : NORMAL;
                fixed4 color : COLOR;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
                fixed4 color : COLOR;
            };

            sampler2D _MainTex;
            float _FurLength;
            float _FurGravity;
            int _Layers;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.color = v.color;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                float fur = tex2D(_MainTex, i.uv).r;
                float alpha = smoothstep(0.5, 1.0, fur);
                return fixed4(1, 1, 1, alpha);
            }
            ENDCG
        }
    }
}

// 4. Holographic Shader
Shader "Custom/Holographic"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _ScanLineSize ("Scan Line Size", Range(0.1, 10)) = 2.0
        _ScanLineSpeed ("Scan Line Speed", Range(-10, 10)) = 2.0
        _FlickerIntensity ("Flicker Intensity", Range(0, 1)) = 0.1
        _FlickerSpeed ("Flicker Speed", Range(1, 100)) = 50.0
        _GlowIntensity ("Glow Intensity", Range(0, 5)) = 2.0
    }

    SubShader
    {
        Tags {
            "Queue"="Transparent"
            "RenderType"="Transparent"
        }

        LOD 200
        Cull Off

        CGPROGRAM
        #pragma surface surf Lambert alpha:fade
        #pragma shader_feature _HOLOGRAM_SHADER_ON

        sampler2D _MainTex;
        fixed4 _Color;
        float _ScanLineSize;
        float _ScanLineSpeed;
        float _FlickerIntensity;
        float _FlickerSpeed;
        float _GlowIntensity;

        struct Input
        {
            float2 uv_MainTex;
            float3 worldPos;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
            // Base texture
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;

            // Scan lines
            float scanline = sin(IN.worldPos.y * _ScanLineSize + _Time.y * _ScanLineSpeed) * 0.5 + 0.5;
            scanline = pow(scanline, 2.0);

            // Flicker effect
            float flicker = sin(_Time.y * _FlickerSpeed) * 0.5 + 0.5;
            flicker = lerp(1.0, flicker, _FlickerIntensity);

            // Edge glow
            float edge = 1.0 - saturate(dot(IN.worldPos - _WorldSpaceCameraPos, IN.worldPos - _WorldSpaceCameraPos));

            // Combine effects
            c.rgb = c.rgb * scanline * flicker + c.rgb * _GlowIntensity * edge;

            o.Albedo = c.rgb;
            o.Alpha = c.a * scanline * flicker;
            o.Emission = c.rgb * _GlowIntensity * edge;
        }
        ENDCG
    }
    Fallback "Transparent/VertexLit"
}

// 5. Particle Shader with Soft Particles
Shader "Custom/SoftParticles"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color ("Color", Color) = (1,1,1,1)
        _InvFade ("Soft Particles Factor", Range(0.01,3.0)) = 1.0
        _Softness ("Softness", Range(0,1)) = 0.5
    }

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

        Blend SrcAlpha OneMinusSrcAlpha
        ColorMask RGB
        Cull Off Lighting Off ZWrite Off

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_particles

            #include "UnityCG.cginc"

            sampler2D _MainTex;
            fixed4 _Color;
            float _InvFade;
            float _Softness;

            struct appdata
            {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
                fixed4 color : COLOR;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
                fixed4 color : COLOR;
                #ifdef SOFTPARTICLES_ON
                    float4 projPos : TEXCOORD2;
                #endif
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.color = v.color;

                #ifdef SOFTPARTICLES_ON
                    o.projPos = ComputeScreenPos(o.vertex);
                    COMPUTE_EYEDEPTH(o.projPos);
                #endif

                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                #ifdef SOFTPARTICLES_ON
                    float sceneZ = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, i.projPos));
                    float partZ = i.projPos.z;
                    float fade = saturate(_InvFade * (sceneZ - partZ));
                    fade = pow(fade, 1.0 + _Softness);
                    i.color.a *= fade;
                #endif

                fixed4 c = tex2D(_MainTex, i.uv) * i.color * _Color;
                return c;
            }
            ENDCG
        }
    }
}

// Unity Post-Processing Shaders

// 1. Bloom Effect Shader
Shader "Hidden/PostProcessing/Bloom"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Threshold ("Bloom Threshold", Range(0, 1)) = 0.5
        _Intensity ("Bloom Intensity", Range(0, 10)) = 1.0
        _BlurSize ("Blur Size", Range(1, 10)) = 3.0
        _Tint ("Bloom Tint", Color) = (1,1,1,1)
    }

    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            float4 _MainTex_TexelSize;
            float _Threshold;
            float _Intensity;
            int _BlurSize;
            fixed4 _Tint;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 original = tex2D(_MainTex, i.uv);

                // Apply threshold
                fixed luminance = dot(original.rgb, fixed3(0.2126, 0.7152, 0.0722);
                fixed4 bloom = luminance > _Threshold ? original : fixed4(0,0,0,1);

                // Apply intensity and tint
                bloom *= _Intensity * _Tint;

                return bloom;
            }
            ENDCG
        }

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            float4 _MainTex_TexelSize;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                float2 texelSize = _MainTex_TexelSize.xy;
                float2 offset = texelSize * 2.0;

                fixed4 color = tex2D(_MainTex, i.uv);

                // Box blur
                for(int x = -2; x <= 2; x++)
                {
                    for(int y = -2; y <= 2; y++)
                    {
                        float2 offset = float2(x, y) * texelSize;
                        color += tex2D(_MainTex, i.uv + offset);
                    }
                }

                color /= 25.0; // Normalize by the number of samples

                return color;
            }
            ENDCG
        }

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            sampler2D _BloomTex;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 original = tex2D(_MainTex, i.uv);
                fixed4 bloom = tex2D(_BloomTex, i.uv);

                return original + bloom;
            }
            ENDCG
        }
    }
}

// 2. Depth of Field Shader
Shader "Hidden/PostProcessing/DepthOfField"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _FocalDepth ("Focal Depth", Range(0, 1)) = 0.5
        _FocalRange ("Focal Range", Range(0, 1)) = 0.1
        _MaxBlurSize ("Max Blur Size", Range(0, 10)) = 5.0
        _Aperture ("Aperture", Range(0.1, 10)) = 2.8
    }

    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            sampler2D _CameraDepthTexture;
            float4 _MainTex_TexelSize;
            float _FocalDepth;
            float _FocalRange;
            float _MaxBlurSize;
            float _Aperture;
            float4 _ProjectionParams;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
                float2 uvDepth : TEXCOORD1;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.uvDepth = ComputeScreenPos(o.vertex).xy / ComputeScreenPos(o.vertex).w;
                return o;
            }

            float LinearEyeDepth(float z)
            {
                return -Linear01Depth(z) * _ProjectionParams.z;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                // Get scene depth
                float depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uvDepth);
                float sceneDepth = LinearEyeDepth(depth);
                float focalPlane = _FocalDepth * _ProjectionParams.z;

                // Calculate circle of confusion
                float coc = abs(sceneDepth - focalPlane) / _FocalRange * _Aperture;
                coc = saturate(coc);

                // Apply blur based on CoC
                float blurSize = coc * _MaxBlurSize;

                fixed4 color = tex2D(_MainTex, i.uv);

                if(blurSize > 1.0)
                {
                    // Box blur
                    float2 texelSize = _MainTex_TexelSize.xy;
                    int blurRadius = (int)blurSize;

                    fixed4 blurredColor = fixed4(0,0,0,0);
                    int sampleCount = 0;

                    for(int x = -blurRadius; x <= blurRadius; x++)
                    {
                        for(int y = -blurRadius; y <= blurRadius; y++)
                        {
                            if(x*x + y*y <= blurRadius * blurRadius)
                            {
                                float2 offset = float2(x, y) * texelSize;
                                blurredColor += tex2D(_MainTex, i.uv + offset);
                                sampleCount++;
                            }
                        }
                    }

                    blurredColor /= sampleCount;

                    // Blend based on CoC
                    color = lerp(color, blurredColor, coc);
                }

                return color;
            }
            ENDCG
        }
    }
}

// 3. Motion Blur Shader
Shader "Hidden/PostProcessing/MotionBlur"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _VelocityScale ("Velocity Scale", Range(0, 2)) = 1.0
        _MaxVelocity ("Max Velocity", Range(0, 10)) = 5.0
        _NumSamples ("Number of Samples", Range(4, 32)) = 16
    }

    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            sampler2D _VelocityTex;
            float2 _MainTex_TexelSize;
            float _VelocityScale;
            float _MaxVelocity;
            int _NumSamples;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                // Get velocity vector
                float2 velocity = tex2D(_VelocityTex, i.uv).rg * 2.0 - 1.0;
                velocity *= _VelocityScale;

                // Limit velocity
                float velocityLength = length(velocity);
                if(velocityLength > _MaxVelocity)
                {
                    velocity = normalize(velocity) * _MaxVelocity;
                }

                // Motion blur
                float2 texelSize = _MainTex_TexelSize.xy;
                fixed4 blurredColor = fixed4(0,0,0,0);
                float totalWeight = 0.0;

                for(int j = 0; j < _NumSamples; j++)
                {
                    float t = (float)j / (_NumSamples - 1) - 0.5;
                    float2 sampleUV = i.uv + velocity * texelSize * t;

                    // Weight based on distance from center
                    float weight = 1.0 - abs(t);
                    blurredColor += tex2D(_MainTex, sampleUV) * weight;
                    totalWeight += weight;
                }

                blurredColor /= totalWeight;

                return blurredColor;
            }
            ENDCG
        }
    }
}

// 4. Screen Transition Shader
Shader "Hidden/PostProcessing/ScreenTransition"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _TransitionTex ("Transition Texture", 2D) = "white" {}
        _NextTex ("Next Texture", 2D) = "white" {}
        _Progress ("Transition Progress", Range(0, 1)) = 0.0
        _TransitionType ("Transition Type", Range(0, 4)) = 0
        _EdgeWidth ("Edge Width", Range(0, 0.5)) = 0.1
        _EdgeSoftness ("Edge Softness", Range(0, 0.5)) = 0.05
    }

    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            sampler2D _TransitionTex;
            sampler2D _NextTex;
            float _Progress;
            int _TransitionType;
            float _EdgeWidth;
            float _EdgeSoftness;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            float FadeTransition(float progress)
            {
                return progress;
            }

            float WipeTransition(float2 uv, float progress)
            {
                return progress > uv.x ? 1.0 : 0.0;
            }

            float CircleTransition(float2 uv, float progress)
            {
                float2 center = float2(0.5, 0.5);
                float distance = length(uv - center);
                return distance > (1.0 - progress) ? 1.0 : 0.0;
            }

            float DiagonalWipeTransition(float2 uv, float progress)
            {
                float2 diagonal = float2(1.0, 1.0);
                float diagonalPos = dot(uv, normalize(diagonal));
                return diagonalPos > progress ? 1.0 : 0.0;
            }

            float RandomTransition(float2 uv, float progress)
            {
                float noise = tex2D(_TransitionTex, uv).r;
                return noise > progress ? 1.0 : 0.0;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                float transitionValue = 0.0;

                switch(_TransitionType)
                {
                    case 0: // Fade
                        transitionValue = FadeTransition(_Progress);
                        break;
                    case 1: // Wipe
                        transitionValue = WipeTransition(i.uv, _Progress);
                        break;
                    case 2: // Circle
                        transitionValue = CircleTransition(i.uv, _Progress);
                        break;
                    case 3: // Diagonal Wipe
                        transitionValue = DiagonalWipeTransition(i.uv, _Progress);
                        break;
                    case 4: // Random Noise
                        transitionValue = RandomTransition(i.uv, _Progress);
                        break;
                }

                // Edge smoothing
                float edge = smoothstep(_Progress - _EdgeSoftness, _Progress + _EdgeSoftness, transitionValue);
                edge = smoothstep(_Progress - _EdgeWidth - _EdgeSoftness,
                                 _Progress - _EdgeWidth + _EdgeSoftness, edge);

                fixed4 currentColor = tex2D(_MainTex, i.uv);
                fixed4 nextColor = tex2D(_NextTex, i.uv);

                // Blend between scenes
                fixed4 finalColor = lerp(nextColor, currentColor, edge);

                return finalColor;
            }
            ENDCG
        }
    }
}

// 5. Vignette Effect Shader
Shader "Hidden/PostProcessing/Vignette"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _VignetteIntensity ("Vignette Intensity", Range(0, 2)) = 1.0
        _VignetteRadius ("Vignette Radius", Range(0, 2)) = 0.8
        _VignetteSmoothness ("Vignette Smoothness", Range(0, 1)) = 0.1
        _VignetteColor ("Vignette Color", Color) = (0,0,0,1)
    }

    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            float _VignetteIntensity;
            float _VignetteRadius;
            float _VignetteSmoothness;
            fixed4 _VignetteColor;

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 originalColor = tex2D(_MainTex, i.uv);

                // Calculate vignette
                float2 center = float2(0.5, 0.5);
                float dist = distance(i.uv, center);

                float vignette = 1.0 - smoothstep(_VignetteRadius, _VignetteRadius + _VignetteSmoothness, dist);
                vignette = saturate(vignette * _VignetteIntensity);

                // Apply vignette
                fixed3 vignetteColor = lerp(_VignetteColor.rgb, originalColor.rgb, vignette);

                return fixed4(vignetteColor, originalColor.a);
            }
            ENDCG
        }
    }
}