{"id":224,"date":"2020-10-25T23:27:48","date_gmt":"2020-10-25T15:27:48","guid":{"rendered":"http:\/\/acgloby.com\/?p=224"},"modified":"2020-10-25T23:27:48","modified_gmt":"2020-10-25T15:27:48","slug":"%e3%80%90unity-shader%e3%80%91%e5%9b%be%e7%89%87%e7%81%b0%e5%ba%a6%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.acgloby.com\/index.php\/2020\/10\/25\/%e3%80%90unity-shader%e3%80%91%e5%9b%be%e7%89%87%e7%81%b0%e5%ba%a6%e5%a4%84%e7%90%86\/","title":{"rendered":"\u3010Unity Shader\u3011\u56fe\u7247\u7070\u5ea6\u5904\u7406"},"content":{"rendered":"\n

YUV<\/h4>\n\n\n\n

YUV\uff0c\u662f\u4e00\u79cd\u989c\u8272\u7f16\u7801\u65b9\u6cd5\u3002\u5e38\u4f7f\u7528\u5728\u5404\u4e2a\u89c6\u9891\u5904\u7406\u7ec4\u4ef6\u4e2d\u3002 YUV\u5728\u5bf9\u7167\u7247\u6216\u89c6\u9891\u7f16\u7801\u65f6\uff0c\u8003\u8651\u5230\u4eba\u7c7b\u7684\u611f\u77e5\u80fd\u529b\uff0c\u5141\u8bb8\u964d\u4f4e\u8272\u5ea6\u7684\u5e26\u5bbd\u3002<\/p>\n\n\n\n

YUV\u662f\u7f16\u8bd1true-color\u989c\u8272\u7a7a\u95f4\uff08color space\uff09\u7684\u79cd\u7c7b\uff0cY\u2019UV, YUV, YCbCr\uff0cYPbPr\u7b49\u4e13\u6709\u540d\u8bcd\u90fd\u53ef\u4ee5\u79f0\u4e3aYUV\uff0c\u5f7c\u6b64\u6709\u91cd\u53e0\u3002\u201cY\u201d\u8868\u793a\u660e\u4eae\u5ea6\uff08Luminance\u6216Luma\uff09\uff0c\u4e5f\u5c31\u662f\u7070\u9636\u503c\uff0c\u201cU\u201d\u548c\u201cV\u201d\u8868\u793a\u7684\u5219\u662f\u8272\u5ea6\uff08Chrominance\u6216Chroma\uff09\uff0c\u4f5c\u7528\u662f\u63cf\u8ff0\u5f71\u50cf\u8272\u5f69\u53ca\u9971\u548c\u5ea6\uff0c\u7528\u4e8e\u6307\u5b9a\u50cf\u7d20\u7684\u989c\u8272\u3002<\/p>\n\n\n\n

\u7b80\u5355\u7684\u8bf4\u5c31\u662fY\u4ee3\u8868\u4eae\u5ea6\uff0c\u8c03Y\u5c31\u53ef\u4ee5\u8c03\u6574\u56fe\u7247\u7684\u7070\u5ea6\u503c\u3002<\/p>\n\n\n\n

YUV\u4e0eRGB\u76f8\u4e92\u8f6c\u6362\u7684\u516c\u5f0f\u5982\u4e0b\uff08RGB\u53d6\u503c\u8303\u56f4\u5747\u4e3a0-255\uff09\uff1a<\/h4>\n\n\n\n

Y = 0.299R + 0.587G + 0.114B
U = -0.147R - 0.289G + 0.436B
V = 0.615R - 0.515G - 0.100B<\/p>\n\n\n\n

R = Y + 1.14V
G = Y - 0.39U - 0.58V
B = Y + 2.03U<\/p>\n\n\n\n

shader\u4ee3\u7801\uff1a<\/h4>\n\n\n\n
float gray = dot(col.rgb, float3(0.299, 0.587, 0.114));\ncol.rgb = float3(gray, gray, gray);<\/code><\/pre>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
\u5b8c\u6574\u4ee3\u7801<\/h4>\n\n\n\n
Properties\n    {\n        _MainTex (\"Texture\", 2D) = \"white\" {}\n        _GrayValue(\"Gray Value\",Range(0,1)) = 0.001\n    }\n    SubShader\n    {\n\n        Pass\n        {\n            CGPROGRAM\n            #pragma vertex vert\n            #pragma fragment frag\n\n            #include \"UnityCG.cginc\"\n\n            struct appdata\n            {\n                float4 vertex : POSITION;\n                float2 uv : TEXCOORD0;\n            };\n\n            struct v2f\n            {\n                float2 uv : TEXCOORD0;\n                float4 vertex : SV_POSITION;\n            };\n\n            v2f vert (appdata v)\n            {\n                v2f o;\n                o.vertex = UnityObjectToClipPos(v.vertex);\n                o.uv = v.uv;\n                return o;\n            }\n\n            sampler2D _MainTex;\n            float _GrayValue;\n\n            fixed4 frag (v2f i) : SV_Target\n            {\n                fixed4 col = tex2D(_MainTex, i.uv);\n                if (col.r > _GrayValue) {\n                    float gray = dot(col.rgb, float3(0.299, 0.587, 0.114));\n                    col.rgb = float3(gray, gray, gray);\n                }\n                return col;\n            }\n            ENDCG\n        }\n    }\n<\/code><\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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