142 lines
4.2 KiB
Plaintext
142 lines
4.2 KiB
Plaintext
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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Shader "PostEffect/DepthOfField" {
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Properties{
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_MainTex("Base (RGB)", 2D) = "white" {}
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_BlurTex("Blur", 2D) = "white"{}
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}
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CGINCLUDE
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#include "UnityCG.cginc"
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struct v2f_blur
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{
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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float4 uv01 : TEXCOORD1;
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float4 uv23 : TEXCOORD2;
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float4 uv45 : TEXCOORD3;
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};
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struct v2f_dof
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{
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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float2 uv1 : TEXCOORD1;
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};
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sampler2D _MainTex;
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float4 _MainTex_TexelSize;
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sampler2D _BlurTex;
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sampler2D_float _CameraDepthTexture;
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float4 _offsets;
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float _focalDistance;
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float _nearBlurScale;
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float _farBlurScale;
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//高斯模糊 vert shader（上一篇文章有详细注释）
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v2f_blur vert_blur(appdata_img v)
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{
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v2f_blur o;
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_offsets *= _MainTex_TexelSize.xyxy;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = v.texcoord.xy;
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o.uv01 = v.texcoord.xyxy + _offsets.xyxy * float4(1, 1, -1, -1);
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o.uv23 = v.texcoord.xyxy + _offsets.xyxy * float4(1, 1, -1, -1) * 2.0;
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o.uv45 = v.texcoord.xyxy + _offsets.xyxy * float4(1, 1, -1, -1) * 3.0;
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return o;
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}
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//高斯模糊 pixel shader（上一篇文章有详细注释）
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fixed4 frag_blur(v2f_blur i) : SV_Target
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{
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fixed4 color = fixed4(0,0,0,0);
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color += 0.40 * tex2D(_MainTex, i.uv);
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color += 0.15 * tex2D(_MainTex, i.uv01.xy);
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color += 0.15 * tex2D(_MainTex, i.uv01.zw);
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color += 0.10 * tex2D(_MainTex, i.uv23.xy);
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color += 0.10 * tex2D(_MainTex, i.uv23.zw);
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color += 0.05 * tex2D(_MainTex, i.uv45.xy);
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color += 0.05 * tex2D(_MainTex, i.uv45.zw);
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return color;
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}
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//景深效果 vertex shader
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v2f_dof vert_dof(appdata_img v)
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{
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v2f_dof o;
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//mvp矩阵变换
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o.pos = UnityObjectToClipPos(v.vertex);
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//uv坐标传递
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o.uv.xy = v.texcoord.xy;
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o.uv1.xy = o.uv.xy;
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//dx中纹理从左上角为初始坐标，需要反向
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#if UNITY_UV_STARTS_AT_TOP
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if (_MainTex_TexelSize.y < 0)
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o.uv.y = 1 - o.uv.y;
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#endif
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return o;
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}
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fixed4 frag_dof(v2f_dof i) : SV_Target
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{
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//取原始清晰图片进行uv采样
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fixed4 ori = tex2D(_MainTex, i.uv1);
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//取模糊普片进行uv采样
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fixed4 blur = tex2D(_BlurTex, i.uv);
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//取当位置对应的深度值
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float depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv);
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//将深度值转化到01线性空间
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depth = Linear01Depth(depth);
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//如果depth小于焦点的物体，那么使用原始清晰图像，否则使用模糊的图像与清晰图像的差值，通过差值避免模糊和清晰之间明显的边界，结果为远景模糊效果
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fixed4 final = (depth <= _focalDistance) ? ori : lerp(ori, blur, clamp((depth - _focalDistance) * _farBlurScale, 0, 1));
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//上面的结果，再进行一次计算，如果depth大于焦点的物体，使用上面的结果和模糊图像差值，得到近景模糊效果
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final = (depth > _focalDistance) ? final : lerp(ori, blur, clamp((_focalDistance - depth) * _nearBlurScale, 0, 1));
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//焦点位置是清晰的图像，两边分别用当前像素深度距离焦点的距离进行差值，这样就达到原理焦点位置模糊的效果
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//上面的？在编译时会被编译成if语句，GPU并不擅长分支计算，而且如果有分支，两个分支都要跑。这里给了一个更优化一些的计算方式，不过语法比较晦涩
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/*float focalTest = clamp(sign(depth - _focalDistance),0,1);
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fixed4 final = (1 - focalTest) * ori + focalTest * lerp(ori, blur, clamp((depth - _focalDistance) * _farBlurScale, 0, 1));
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final = (focalTest)* final + (1 - focalTest) * lerp(ori, blur, clamp((_focalDistance - depth) * _nearBlurScale, 0, 1)); */
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return final;
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}
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ENDCG
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SubShader
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{
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//pass 0: 高斯模糊
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Pass
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{
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ZTest Off
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Cull Off
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ZWrite Off
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Fog{ Mode Off }
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CGPROGRAM
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#pragma vertex vert_blur
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#pragma fragment frag_blur
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ENDCG
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}
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//pass 1: 景深效果
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Pass
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{
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ZTest Off
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Cull Off
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ZWrite Off
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Fog{ Mode Off }
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ColorMask RGBA
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CGPROGRAM
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#pragma vertex vert_dof
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#pragma fragment frag_dof
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ENDCG
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}
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}
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} |