{"id":348,"date":"2026-02-03T02:10:32","date_gmt":"2026-02-02T18:10:32","guid":{"rendered":"http:\/\/chenglixue.top\/?p=348"},"modified":"2026-04-03T19:13:21","modified_gmt":"2026-04-03T11:13:21","slug":"%e7%99%bb%e7%a5%9e%ef%bc%9adeinterleave-hbao","status":"publish","type":"post","link":"http:\/\/chenglixue.top\/?p=348","title":{"rendered":"DX12 \u767b\u795e\uff1aDeinterleave HBAO+"},"content":{"rendered":"

<\/div><\/p>\n

\u524d\u8a00\u4e0e\u95ee\u9898<\/h1>\n

\u4e0a\u7bc7\u4ecb\u7ecd\u7684HBAO\u601d\u8def\u5176\u5b9e\u662fUE HBAO\u7684\u65b9\u6848\uff0c\u901a\u8fc7\u5347\u964d\u91c7\u6837\u6df7\u5408\u6765\u5b9e\u73b0\u5927\u8303\u56f4\u9634\u5f71\uff0c\u8fd9\u79cd\u505a\u6cd5\u4f1a\u5b58\u5728\u51e0\u4e2a\u95ee\u9898\uff1a<\/p>\n

    \n
  1. \u5347\u964d\u91c7\u6837\u4f1a\u5bfc\u81f4\u753b\u9762\u6a21\u7cca<\/strong>\uff0c\u591a\u4e86\u4e24\u5f20\u56fe\u7684\u5f00\u9500<\/li>\n
  2. \u7531\u4e8e\u5728\u5168\u5206\u8fa8\u7387\u8ba1\u7b97\uff0c\u4e3a\u4e86AO\u8303\u56f4\u66f4\u5927\uff0c\u534a\u5f84\u4f1a\u8bbe\u7f6e\u7684\u8f83\u5927\uff0c\u90a3\u4e48\u91c7\u6837\u8303\u56f4\u4fbf\u589e\u5927\u4e86\uff0c\u5bfc\u81f4GPU\u7684\u7eb9\u7406\u7f13\u5b58\u547d\u4e2d\u7387\u964d\u4f4e<\/strong><\/li>\n
  3. \u5347\u964d\u91c7\u6837\u6df7\u5408\u4e0eTAA\u5bfc\u81f4\u95ea\u70c1<\/strong>\u7684\u51fa\u73b0<\/li>\n<\/ol>\n

    \u4e3a\u4e86\u89e3\u51b3\u4ee5\u4e0a\u51e0\u4e2a\u95ee\u9898\uff0cHBAO+\u7531\u6b64\u8bde\u751f<\/p>\n

    \u4ec0\u4e48\u662fHBAO+<\/h1>\n

    HBAO+\u4e0eHBAO\u6700\u5927\u7684\u4e0d\u540c\uff0c\u5728\u4e8e\u9650\u5b9a\u968f\u673a\u533a\u57df<\/strong>\uff0cHBAO\u672c\u8d28\u8fd8\u662f\u66b4\u529b\u968f\u673a\uff0c\u5373\u4f7f\u4f7f\u7528blue noise\uff0c\u4f9d\u7136\u4f1a\u5bfc\u81f4\u566a\u70b9\u7684\u51fa\u73b0\uff1b\u800cHBAO+\u4f7f\u7528\u4e24\u4e24\u5782\u76f44\u4e2a\u5411\u91cf\u91c7\u6837\u7684\u65b9\u5f0f\uff0c\u8fd9\u79cd\u505a\u6cd5\u53ef\u4ee5\u9650\u5b9a\u968f\u673a\u533a\u57df\uff0c\u4e0d\u81f3\u4e8e\u5728\u4e00\u4e2a\u5927\u7684\u533a\u57df\u91cc\u968f\u673a\uff0c\u5c06\u4e00\u4e2a\u5927\u7684\u533a\u57df\u62c6\u5206\u6210\u56db\u4e2a\u5c0f\u533a\u57df\uff0c\u5728\u56db\u4e2a\u5c0f\u533a\u57df\u91cc\u6492\u70b9\uff0c\u5982\u6b64\u4e0eHBAO\u76f8\u6bd4\u5f97\u5230\u7684\u566a\u70b9\u4f1a\u5927\u5927\u51cf\u5c11<\/p>\n

    \u7b97\u6cd5\u6d41\u7a0b<\/h1>\n

    \u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n

      \n
    • \u6784\u5efa\u56db\u4e2a\u4e24\u4e24\u5782\u76f4\u7684\u5411\u91cf<\/li>\n
    • \u5c06\u5411\u91cf\u53d8\u6362\u5230uv space<\/li>\n
    • \u548cHBAO\u4e00\u6837\uff0c\u5411\u91cf\u6b65\u8fdb\uff0c\u8bb0\u5f55\u6700\u5927\u4ef0\u89d2<\/li>\n<\/ul>\n
      float randomAngle = randomVector.x * TWO_PI;\n\nconst int NUM_DIRECTIONS = 4;\n\/\/ world space to uv space\nfloat pixelRadius = radius * projScale.x \/ max(inputParam.LinearEyeDepth, 1.f);\npixelRadius *= 0.5f * g_TargetSize.y;\n\nfloat2 texelSize = g_TargetSize.zw;\nfloat stepPixel = pixelRadius \/ (NUM_STEPS + 1);\n\n[unroll(4)]\nfor (UINT dir = 0; dir < NUM_DIRECTIONS; dir ++)\n{\n    float angle = float(dir) \/ float(NUM_DIRECTIONS) * TWO_PI + randomAngle;\n    float2 dirUV;\n    sincos(angle, dirUV.y, dirUV.x);\n\n    float2 deltaUV = dirUV * texelSize * stepPixel;\n\n    float2 currentUV = inputParam.ScreenUV + deltaUV;\n\n    \/\/... \u6b65\u8fdb\n}\n<\/code><\/pre>\n
        \n
      • \u6548\u679c\uff1a\n
        \u4e0b\u56fe\u662f\u4e3aTAA jitter 6\u6b21\u6b65\u8fdb\u540e\u7684\u6548\u679c<\/p>\n
        \"\"<\/p >\n
        \u4f18\u5316<\/h1>\n
        \u603b\u7684\u6765\u8bf4\uff0cHBAO+\u53ef\u9009\u7684\u4f18\u5316\u65b9\u6848\u5982\u4e0b\uff1a<\/p>\n
          \n
        1. \u53bb\u4ea4\u9519<\/strong>\uff1aHBAO+\u5728\u4f18\u5316\u65b9\u6848\u4e0eHBAO\u4e5f\u6709\u5f88\u5927\u7684\u4e0d\u540c\uff0c\u9996\u5f53\u5176\u51b2\u7684\u5c31\u662f\u53bb\u4ea4\u9519<\/strong>\u6e32\u67d3\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u7c7b\u4f3cTile-Based\uff0c\u90fd\u662f\u5c06\u4e00\u5f20\u6574\u56fe\u5212\u5206\u4e3a\u8bb8\u591a\u5f20\u5c0f\u56fe<\/li>\n
        2. \u4ea4\u53c9\u53cc\u8fb9\u6ee4\u6ce2<\/strong>\uff1a\u666e\u901a\u7684\u6a21\u7cca\u4e0d\u592a\u9002\u5408AO\u7b97\u6cd5\uff0c\u56e0\u4e3a\u6a21\u7cca\u4f1a\u5bfc\u81f4AO\u7684\u7ec6\u8282\u4e22\u5931\uff0c\u5c24\u5176\u662f\u8fb9\u7f18\u4f1a\u968f\u7740\u6a21\u7cca\u5f3a\u5ea6\u7684\u589e\u5927\u800c\u53d8\u5927\uff0c\u9700\u8981\u4e00\u79cd\u6a21\u7cca\u7b97\u6cd5\uff0c\u5728\u4fdd\u7559\u8fb9\u7f18\u7684\u540c\u65f6\u6a21\u7cca\u4e2d\u5fc3\uff0c\u81ea\u7136\u800c\u7136\u5730\u60f3\u5230\u4e86\u53cc\u8fb9\u6ee4\u6ce2\uff0c\u4f46\u7b80\u5355\u7684\u53cc\u8fb9\u6ee4\u6ce2\u5e76\u4e0d\u80fd\u6ee1\u8db3\u8fd9\u4e00\u9700\u6c42\uff0c\u8fd8\u9700\u8981\u8003\u8651\u91c7\u6837\u70b9\u7684normal \u548c depth\uff0c\u6765\u8ba1\u7b97\u8fde\u7eed\u6027\uff1b\u751a\u81f3\u5f53\u6a21\u7cca\u534a\u5f84\u8fc7\u5927\u65f6\uff0c\u56e0\u4e3a\u9ad8\u65af\u6743\u91cd\u7684\u539f\u56e0\uff0c\u8d8a\u5f80\u5916\u6743\u91cd\u4f4e\uff0c\u90a3\u4e48\u534a\u5f84\u5927\u7684\u5c31\u4e0d\u518d1\u4e2aradius\u7684\u589e\u5927\uff0c\u800c\u662f2\u4e2aradius<\/li>\n
        3. \u81ea\u9002\u5e94\u91c7\u6837\u8d28\u91cf<\/strong>\uff1a\u6839\u636e\u4e0a\u56fe\u6240\u793a\uff0c\u6211\u4eec\u53ea\u60f3\u5728\u9ed1\u8272\u90e8\u5206\u4e14\u8d8a\u9ed1\u7684\u90e8\u5206\u63d0\u4f9b\u9ad8\u8d28\u91cf\u7684AO\uff0c\u8d8a\u767d\u7684\u90e8\u5206\u63d0\u4f9b\u4f4e\u7684<\/li>\n<\/ol>\n
          \u4ea4\u53c9\u53cc\u8fb9\u6ee4\u6ce2<\/h2>\n
          \u8ba1\u7b97\u6df1\u5ea6\u6743\u91cd<\/h3>\n
          \u8ba1\u7b97\u4e24\u4e2a\u91c7\u6837\u70b9\u7684\u6df1\u5ea6\u5dee\uff0c\u57fa\u4e8e\u6df1\u5ea6\u5dee\u8ba1\u7b97\u6df1\u5ea6\u6743\u91cd\uff0c\u9700\u8981\u8003\u8651\u8fd1\u5904\u6743\u91cd\u5c0f\uff0c\u8fdc\u5904\u6743\u91cd\u5927\uff0c\u6df1\u5ea6\u5dee\u8d8a\u5927\uff0c\u6743\u91cd\u5e94\u8be5\u8d8a\u5c0f<\/strong><\/p>\n
          \u8fd1\u5904\u6743\u91cd\u5c0f\uff0c\u8fdc\u5904\u6743\u91cd\u5927\uff1a\u9664\u4ee5scene depth<\/p>\n
          \u6df1\u5ea6\u5dee\u8d8a\u5927\uff0c\u6743\u91cd\u5e94\u8be5\u8d8a\u5c0f\uff1a\u8fd9\u548cexp(-x)\u5f88\u7c7b\u4f3c<\/p>\n
          \"\"<\/p >\n
          float depthDiff = abs(centerEyeDepth - sampleEyeDepth);\nfloat depthScale = 10.0f \/ max(1.0f, centerEyeDepth);\nfloat depthWeight = exp(-depthDiff * depthScale);\n<\/code><\/pre>\n
          \u8fd9\u91cc10\u662f\u4e00\u4e2a\u7ecf\u9a8c\u503c<\/p>\n
          \u8ba1\u7b97\u6cd5\u7ebf\u6743\u91cd<\/h3>\n
          \u8ba1\u7b97\u4e24\u4e2a\u6cd5\u7ebf\u7684\u5dee\u5f02\u5ea6\uff0c\u57fa\u4e8e\u5dee\u5f02\u5ea6\u8ba1\u7b97\u6cd5\u7ebf\u6743\u91cd<\/p>\n
          float normalDiff = saturate(dot(centerNormal, sampleNormal));\nfloat normalWeight = pow(max(normalDiff, 0.1f), g_Sharpness);\n<\/code><\/pre>\n
          \u5b9e\u73b0<\/h3>\n
          \u5176\u4f59\u90e8\u5206\u4e0e\u53cc\u8fb9\u6ee4\u6ce2\u65e0\u5f02\uff0c\u91c7\u7528\u53ef\u5206\u79bb\u7684\u601d\u8def\u6765\u4f18\u5316\uff0c\u5c06\u65f6\u95f4\u590d\u6742\u5ea6\u4eceN^2<\/span>\u964d\u81f32N<\/span>\u3002\u4e0d\u96be\u5199\u51fa\uff1a<\/p>\n
          float2 sampleUV;\nfloat sampleAO;\nfloat sampleEyeDepth;\nfloat3 sampleNormal;\nfloat LOD = 0;\nfloat sampleRadius = 1.f;\n\nsampleUV = centerUV + direction * stride * distance * texelSize * sampleRadius;\nsampleAO = SampleTexture2D(g_SourceTexIndex,\n                           sampleUV,\n                           ClampPointSampler).r;\nfloat rawDepth = SampleTexture2D(OpaqueDepthIndex, sampleUV, ClampPointSampler).r;\nsampleEyeDepth = LinearEyeDepth(rawDepth, g_ZBufferParams);\nsampleNormal = SampleNormalWS(sampleUV, ClampPointSampler);\n\nfloat weight = ComputeWeight(sampleEyeDepth,\n                                 sampleNormal,\n                                 centerEyeDepth,\n                                 centerNormal,\n                                 distance,\n                                 blurFalloff);\ntotalAO += sampleAO * weight;\ntotalWeight += weight;\n<\/code><\/pre>\n
          Deinterleave<\/h2>\n
            \n
          • \u95ee\u9898\uff1a\u53cc\u8fb9\u6ee4\u6ce2\u53ef\u4ee5\u6a21\u7cca\u566a\u70b9\uff0c\u964d\u4f4e\u91c7\u6837\u6b21\u6570\uff0c\u4f46\u4e0d\u80fd\u89e3\u51b3HBAO+\u672c\u8eab\u7684\u95ee\u9898\u2014\u2014GPU L2\u7f13\u5b58\u7684\u547d\u4e2d\u7387<\/strong>\n
              \n
            • GPU L2\u662f\u5b58\u50a8\u7eb9\u7406\u3001\u5e38\u91cf\u7684\u5730\u65b9\uff0c\u7531\u4e8eL2\u7684\u7f13\u5b58\u4e0d\u5927\uff08\u53ea\u6709\u51e0MB\uff09\uff0c\u4e0d\u53ef\u80fd\u52a0\u8f7d\u8d34\u56fe\u7684\u6240\u6709pixel\u3002\u5982\u4e0b\u9762\u4ee3\u7801\u6240\u793a\uff0c\u5728HBAO+ \u5faa\u73af\u91cc\u4f1a\u5bf9depth texture\u53cd\u590d\u91c7\u6837\uff0c\u7531\u4e8e\u6b65\u8fdb\u548c\u91c7\u6837\u534a\u5f84\uff0c\u968f\u7740\u6b65\u8fdb\u589e\u5927\u4e0e\u91c7\u6837\u534a\u5f84\u589e\u5927\uff0c\u4e0a\u4e00\u6b21\u91c7\u6837\u7684pixel\u53ef\u80fd\u79bb\u4e0b\u4e00\u6b21\u91c7\u6837\u7684pixel\u5f88\u8fdc\uff0c\u8fd9\u5c31\u5bfc\u81f4L2\u6bcf\u6b21\u91c7\u6837\u90fd\u9700\u8981\u52a0\u8f7dpixel\uff0c\u5f88\u663e\u7136\u5229\u7528\u7387\u975e\u5e38\u4f4e\u3002\u751a\u81f3HBAO+\u8fd8\u9700\u8981\u5728\u56db\u4e2a\u533a\u57df\u91cc\u968f\u673a\u70b9\uff0c\u8fdb\u4e00\u6b65\u964d\u4f4e\u4e86pixel<\/li>\n<\/ul>\n
              for each pixel p:\n    float occlusion = 0;\n    for each direction d:\n        float maxHorizon = 0;\n        for step = 1 to numSteps:\n            samplePos = p + d * step * randomScale;\n            sampleDepth = texture2D(depthTex, samplePos).r;\n<\/code><\/pre>\n
                \n
              • SIMD\uff1aGPU\u7684\u5de5\u4f5c\u65b9\u5f0f\u7c7b\u4f3cSIMD\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u7ec4\u4f1a\u6267\u884c\u76f8\u540c\u7684\u6307\u4ee4\uff0c\u518d\u6839\u636e\u4e0a\u9762\u63d0\u5230\u7684\u95ee\u9898\uff0c\u6574\u4e2a\u7ebf\u7a0b\u7ec4\u91c7\u6837\u7684\u533a\u57df\u4e0d\u591f\u96c6\u4e2d\uff0c\u975e\u5e38\u7a00\u758f\uff0c\u5bfc\u81f4L2\u9891\u7e41\u7684\u66f4\u6362<\/li>\n<\/ul>\n<\/li>\n
              • \u89e3\u51b3\uff1a\u9700\u8981\u4e00\u79cd\u65b9\u6cd5\u8ba9\u4e00\u4e2a\u7ebf\u7a0b\u7ec4\u5185\u7684\u7ebf\u7a0b\u8bbf\u95ee\u7684\u533a\u57df\u5c3d\u91cf\u96c6\u4e2d\n
                \u4ed4\u7ec6\u60f3\u60f3\uff0c\u6b65\u8fdb\u7684\u65f6\u5019\uff0c\u5148\u91c7\u6837\u4e00\u4e2apixel\uff0c\u53cd\u590d\u6b65\u8fdbn\u4e2apixel\u540e\u91c7\u6837\uff0c\u8fd9\u662f\u5426\u610f\u5473\u7740\uff0c\u5982\u679c\u628a\u6574\u4e2a\u5c4f\u5e55\uff0c\u6309n*n\u7684\u533a\u57df\u5212\u5206\uff08\u8fd9\u91cc\u79f0\u4e3a\u5757\uff09\uff0c\u6240\u6709n*n\u7684\u5757\u4e2d\u7d22\u5f15\u4e3a[0,0]\u7684pixel\u90fd\u5b58\u50a8\u5728\u4e00\u5f20\u5c0f\u56fe\u91cc\uff0c\u7d22\u5f15\u4e3a[0,1]\u7684pixel\u90fd\u5b58\u50a8\u5728\u53e6\u4e00\u5f20\u5c0f\u56fe\u91cc\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7<\/p>\n
                \u8fd9\u6837\u6bcf\u6b21\u6b65\u8fdbn\u4e2a\u50cf\u7d20\u540e\u91c7\u6837\u7684pixel\u90fd\u5728\u540c\u4e00\u5f20\u56fe\u5185\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u7ec4\u5185\u6240\u6709\u7ebf\u7a0b\u91c7\u6837\u7684\u533a\u57df\u4e0d\u5c31\u5728\u4e00\u5f20\u56fe\u91cc\u4e86\u561b<\/p>\n<\/li>\n
              • \n
                \u7b97\u6cd5<\/p>\n
                \u542c\u8d77\u6765\u5f88\u7b80\u5355\uff0c\u5b9e\u73b0\u8d77\u6765\u53ef\u4e0d\u7b80\u5355\uff0c\u5206\u4e3a\u4ee5\u4e0b\u51e0\u6b65\uff1a<\/p>\n
                  \n
                1. \u5c06\u4e00\u4e2a\u6574\u56fe\u62c6\u5206\u4e3a\u591a\u4e2a\u5c0f\u56fe\uff0c\u5206\u4e3adepth\u548cAO\n
                  \u6574\u56fe\u5e94\u8be5\u62c6\u5206\u4e3a\u591a\u5c11\u5f20\u56fe\uff1f<\/p>\n
                  GPU\u5728\u91c7\u6837\u65f6\u662f\u63092x2\u7684\u5757\u91c7\u6837\uff0cGPU\u4f1a\u68c0\u6d4b\u8fd9\u56db\u4e2apixel\u5bf9\u5e94\u7684\u4fe1\u606f\uff0c\u770b\u8fd9\u4e9b\u4fe1\u606f\u5728L2\u4e2d\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u4f1a\u5c06\u6570\u636e\u653e\u5165Cache Line<\/strong>\u52a0\u8f7d\u5230L2<\/p>\n
                  Cache Line<\/strong>\u5341\u5206\u91cd\u8981\uff0c\u5b83\u4e00\u6b21\u6027\u53ef\u4ee5\u52a0\u8f7d64\u5b57\u8282\uff0c\u800cR32FLOAT<\/strong>\u5927\u5c0f4\u5b57\u8282\uff0c\u8fd9\u610f\u5473\u7740Cache Line\u4e00\u6b21\u6027\u53ef\u4ee5\u52a0\u8f7d16\u4e2a\u683c\u5f0f\u4e3aR32FLOAT\u7684pixel<\/strong><\/p>\n
                  \u518d\u8005\uff0c\u7531\u4e8eAO\u6548\u679c\u4e00\u822c\u90fd\u8981\u6c42\u8303\u56f4\u8f83\u5927\uff0c\u56e0\u6b64\u5c06\u5c0f\u56fe\u5206\u621016\u5f20<\/strong>\u662f\u4e0d\u9519\u7684\u9009\u62e9<\/p>\n<\/li>\n
                2. \n
                  \u6bcf\u4e2a\u5c0f\u56fe\u53bb\u4ea4\u9519\uff0c\u4fdd\u5b58depth<\/p>\n<\/li>\n
                3. \n
                  \u5728\u5168\u5c4f\u4e0b\u91c7\u6837\u5c0f\u56fedepth\uff0c\u5f97\u5230\u5c0f\u56feAO<\/p>\n<\/li>\n
                4. \n
                  \u591a\u5f20AO\u5c0f\u56fe\u8fd8\u539f\u6574\u56fe<\/p>\n<\/li>\n<\/ol>\n
                  \u6d41\u7a0b\u5982\u4e0b\u56fe\u6240\u793a\uff1a
                  \n\"\"<\/p >\n
                5. \n
                  \u5b9e\u73b0<\/p>\n
                    \n
                  • \u521b\u5efa16\u5f20\u5c0f\u56fe\uff0c\u6bcf\u5f20\u5c0f\u56fe\u7684\u5206\u8fa8\u7387\u4e3a\u5168\u5206\u8fa8\u7387\u76841\/4\uff0c\u5c06\u8fd9\u4e9b\u5c0f\u56fe\u653e\u5728\u4e00\u4e2a\u6570\u7ec4\u91cc\u4f20\u7ed9GPU\uff0cGPU\u4e00\u4e2adispath\u8ba1\u7b97\u6240\u6709\u7684\u5c0f\u56fe<\/li>\n<\/ul>\n
                    UINT2 pixelOffset = id.xy % 4;\nUINT layerIndex = pixelOffset.x + pixelOffset.y * 4;\n\nUINT2 writePos = id.xy \/ 4;\n\n\/\/ sample Depth\no[writePos] = depth;\n<\/code><\/pre>\n
                    \u4ee54x4\u4e3a\u4e00\u4e2a\u5757\uff0c\u6bcf\u4e2a\u5757\u7684\u540c\u4e00\u7d22\u5f15\u503c\u90fd\u653e\u5728\u540c\u4e00\u5c0f\u56fe\u91cc<\/p>\n
                      \n
                    • \u5728\u5c0f\u56fe\u4e2d\u8ba1\u7b97AO<\/li>\n<\/ul>\n
                      \u91cd\u70b9\u5728\u8fd8\u539f\u5168\u5206\u8fa8\u7387\u7684screen uv<\/p>\n
                      UINT layerIndex = id.z;\n\nuint offsetX = layerIndex % 4;\nuint offsetY = layerIndex \/ 4;\n\nfloat2 fullScreenUV = (float2(id.xy * 4 + uint2(offsetX, offsetY)) + 0.5f) *\n                          g_FullScreenSize.zw;\n<\/code><\/pre>\n
                      UINT layerIndex = id.z;<\/span>\u8fd9\u662f\u56e0\u4e3a\uff0cdispatch(x,y,16)\uff0c\u53ef\u4ee5\u5e76\u884c\u6267\u884c16\u5f20AO\u56fe\u7684\u8ba1\u7b97<\/p>\n
                      \u540e\u7eed\u6b65\u8fdb\u9700\u8981\u6c42\u5168\u5206\u8fa8\u7387\u4e0b\u6b65\u8fdb\u540e\u7684sample uv\uff0c\u867d\u7136\u5c0f\u56fe\u7684\u5206\u8fa8\u7387\u662f\u5168\u5206\u8fa8\u7387\u76841\/4\uff0c\u4f46uv\u90fd\u5728[0,1]\uff0c\u7528\u4ee5\u4e0b\u4ee3\u7801\u5373\u53ef\u8fd8\u539f<\/p>\n
                      float2 sampleFullUV = fullUV + (currentUV - localUV);\n<\/code><\/pre>\n
                        \n
                      • 16\u5f20\u5c0f\u56fe\u62fc\u6210\u5927\u56fe<\/li>\n<\/ul>\n
                        \u5176\u5b9e\u662f\u7b2c\u4e00\u6b65\u7684\u9006\u8ba1\u7b97\uff0c\u5728\u5168\u5206\u8fa8\u7387\u4e0b\u8ba1\u7b97\uff0c\u8fd8\u539fAO<\/p>\n
                        UINT2 pixelOffset = id.xy % 4;\nUINT layerIndex = pixelOffset.x + pixelOffset.y * 4;\nUINT2 readPos = id.xy \/ 4;\n\n\/\/ load ao\no[id.xy] = ao;\n<\/code><\/pre>\n<\/li>\n
                      • \u6027\u80fd\n
                        \u8017\u65f6\u5982\u4e0b\uff1a
                        \n\"\"<\/p >\n
                        \u4e0b\u56fe\u5c55\u793a\u4e86L2\u547d\u4e2d\u7387\u4e0e\u7ebf\u7a0b\u7ec4\u7684\u5360\u7528\u7387\uff0c\u53ef\u4ee5\u770b\u5230\u6570\u636e\u5f88\u4e0d\u9519\uff0c\u90fd\u572860\u523070
                        \n\"\"<\/p >\n
                        Importance\u91c7\u6837<\/h2>\n
                          \n
                        • \n
                          \u95ee\u9898\uff1a\u76ee\u524d\u6bcf\u4e2apixel\u90fd\u4ee5\u76f8\u540c\u7684\u91c7\u6837\u6b21\u6570\u91c7\u6837\uff0c\u5374\u4e0d\u7ba1\u8fd9\u4e2a\u70b9\u5bf9AO\u7684\u8d21\u732e\u9ad8\u4e0d\u9ad8\uff0c\u5bf9\u4e8e\u5e73\u5766\u533a\u57df\u5982\u6b64\u505a\u6cd5\u4f1a\u5bfc\u81f4\u5927\u91cf\u4e0d\u5fc5\u8981\u7684\u6d6a\u8d39<\/p>\n<\/li>\n
                        • \n
                          \u89e3\u51b3\uff1a\u63d0\u524d\u8ba1\u7b97\u4e00\u5f20importance\u56fe\uff0c\u56fe\u4e2d\u8bb0\u5f55\u6bcf\u4e2apixel\u5bf9AO\u7684\u91cd\u8981\u6027\uff0c\u91cd\u8981\u6027\u9ad8\u7684pixel\u5728\u540e\u7eed\u7ee7\u7eedAO\u65f6\uff0c\u63d0\u9ad8\u91c7\u6837\u6b21\u6570\uff0c\u91cd\u8981\u6027\u4f4e\u7684pixel\u5219\u964d\u4f4e\u91c7\u6837\u6b21\u6570<\/p>\n<\/li>\n
                        • \n
                          \u7b97\u6cd5<\/p>\n
                            \n
                          • importance\u8ba1\u7b97\u4f9d\u636e<\/p>\n<\/li>\n
                          • \n
                            \u65e2\u7136AO\u51fa\u73b0\u5728\u6df1\u5ea6\u53d8\u5316\u5927\u7684\u533a\u57df\uff0c\u53ef\u4ee5\u7528\u6df1\u5ea6\u53d8\u5316\u4f5c\u4e3a\u4f9d\u636e\u5417\uff1f<\/p>\n
                            \u53ef\u4ee5\u4f46\u4e0d\u591a\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4f1a\u5b58\u5728\u4e00\u5b9a\u95ee\u9898\u3002\u4e00\u822cAO\u7684\u533a\u57df\u90fd\u4f1a\u8c03\u7684\u6bd4\u8f83\u5927\uff0c\u8fd9\u4e00\u533a\u57df\u4e00\u5b9a\u662f\u5927\u4e8e\u6df1\u5ea6\u53d8\u5316\u7684\u533a\u57df\uff0c\u7b14\u8005\u5728\u6d4b\u8bd5\u65f6\u8fd9\u79cd\u65b9\u6cd5\u65f6\uff0c\u53d1\u73b0\u4f1a\u9020\u6210\u5927\u91cf\u7684\u622a\u65ad\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u4e0e\u5730\u9762\u7684\u63a5\u89e6\u533a\u57df\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0d\u7528importance\uff0cAO\u533a\u57df\u5927\u6982\u662f\u4e0b\u56fe\u7684\u4e24\u500d
                            \n\"\"<\/p >\n
                          • \n
                            \u4e3a\u4e86\u5f97\u5230\u66f4\u51c6\u786e\u7684importance\uff0c\u53ef\u4ee5\u8ba1\u7b97AO\uff0c\u8fd9\u6837\u5f97\u5230\u7684\u6548\u679c\u4e00\u5b9a\u662f\u51c6\u786e\u7684\uff01<\/p>\n<\/li>\n
                          • \n
                            \u4e3a\u4e86\u907f\u514d\u5728importance\u4e2d\u8ba1\u7b97AO\u5e26\u6765\u7684\u5de8\u5927\u5f00\u9500\uff0c\u8fd9\u4e00\u6b65\u4e00\u5b9a\u8981\u964d\u91c7\u6837<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                            \u57fa\u4e8eimportance\u7684\u4ea4\u53c9\u53cc\u8fb9\u6ee4\u6ce2<\/h2>\n
                              \n
                            • \u95ee\u9898\uff1a\u76ee\u524d\u7684\u4ea4\u53c9\u6ee4\u6ce2\u548cAO\u8ba1\u7b97\u4e00\u6837\uff0c\u6bcf\u4e2apixel\u7684\u91c7\u6837\u534a\u5f84\u90fd\u76f8\u540c\uff0c\u5229\u7528importance\u4e5f\u53ef\u4ee5\u505a\u5230\u548c\u8ba1\u7b97AO\u4e00\u6837\u7684\u6548\u679c<\/li>\n
                            • \u89e3\u51b3\uff1a\u9488\u5bf9\u5e73\u5766\u533a\u57df\uff08importance\u4f4e\uff09\u63d0\u9ad8\u91c7\u6837\u534a\u5f84\uff0c\u9488\u5bf9\u6df1\u5ea6\u53d8\u5316\u5927\u7684\u533a\u57df\uff08importance\u9ad8\uff09\u964d\u4f4e\u91c7\u6837\u534a\u5f84<\/li>\n<\/ul>\n
                              CheckBoard+TAA<\/h2>\n
                                \n
                              • \u95ee\u9898\uff1a\u53bb\u4ea4\u9519\u662f\u56db\u5f20\u56fe\u540c\u65f6\u8ba1\u7b97\uff0c\u76f8\u5f53\u4e8e\u8ba1\u7b97\u5168\u5206\u8fa8\u7387\uff0c\u6027\u80fd\u538b\u529b\u8fd8\u662f\u5927\uff0c\u9700\u8981\u4e00\u79cd\u65b9\u6cd5\u6bcf\u5e27\u53ea\u8ba1\u7b97\u4e00\u534a\u7684\u56fe<\/li>\n
                              • \u89e3\u51b3\uff1a\u5229\u7528CheckBoard\u6e32\u67d3\uff0c\u7b2c\u4e00\u5e27\u6e32\u67d3\u767d\u68cb\uff08\u5176\u4e2d\u4e24\u4e2a\u56fe\uff09\uff0c\u7b2c\u4e8c\u5e27\u6e32\u67d3\u9ed1\u68cb\uff08\u53e6\u5916\u4e24\u5f20\u56fe\uff09\u5e76\u5408\u5e76\u7b2c\u4e00\u5e27\u7ed3\u679c\uff08\u5f97\u5230\u4e00\u4e2a\u5b8c\u6574\u7684AO\uff09\uff0c\u540e\u7eed\u53cd\u590d\u8fd9\u4e2a\u8fc7\u7a0b\uff1b\u5728\u7b2c\u4e09\u5e27\u6e32\u67d3\u9ed1\u68cb\u65f6\uff0c\u63d0\u53d6\u7b2c\u4e8c\u5e27\u7684\u9ed1\u68cb\u90e8\u5206\u505a\u65f6\u95f4\u6ee4\u6ce2\uff0c\u5c06\u6ee4\u6ce2\u540e\u7684\u9ed1\u68cb\u4e0e\u7b2c\u4e8c\u5e27\u7684\u767d\u68cb\u5408\u5e76\uff0c\u540e\u7eed\u53cd\u590d\u8fd9\u4e2a\u8fc7\u7a0b<\/li>\n<\/ul>\n
                                HIZ+\u53bb\u4ea4\u9519<\/h2>\n
                                  \n
                                • \n
                                  \u95ee\u9898\uff1a\u5168\u5206\u8fa8\u7387\u4e0b\u7684HIZ\u538b\u529b\u548c\u8303\u56f4\u8fd8\u662f\u5927\u4e86\uff0c\u53ef\u4ee5\u8fdb\u4e00\u6b65\u7f29\u5c0f<\/p>\n<\/li>\n
                                • \n
                                  \u89e3\u51b3\uff1a\u5bf9HIZ\u4e5f\u53bb\u4ea4\u9519<\/p>\n
                                  \"\"
                                  \n
                                  \u4e2a\u4eba\u65b9\u6848<\/h1>\n
                                    \n
                                  • \n
                                    \u7b97\u6cd5\u8bf4\u660e\uff1a\u4e3a\u4e86\u6700\u5927\u7a0b\u5ea6\u7684\u63d0\u9ad8L2\u7684\u547d\u4e2d\u7387\uff0c\u6211\u5c06HIZ+Base AO\uff08\u7528\u4e8e\u540e\u7eed\u8ba1\u7b97importance\uff09+ Calc AO\u90fd\u8fdb\u884c\u4e86\u53bb\u4ea4\u9519\u3002\u4e3a\u4ec0\u4e48\u4e0d\u5bf9blur\u4e5f\u53bb\u4ea4\u9519\u5462\uff0c\u56e0\u4e3a\u5728 Calc AO\u9636\u6bb5\u52a0\u5165\u968f\u673a\u65cb\u8f6c\u7528\u4e8e\u540e\u7eed\u914d\u5408TAA\uff0c\u5982\u679c\u5728blur\u53bb\u4ea4\u9519\u540e\u518d\u4e0a\u91c7\u6837\u4f1a\u5bfc\u81f4\u540e\u7eedTAA\u7684\u95ea\u70c1\u5f02\u5e38\u660e\u663e
                                    \n\"\"<\/p >\n
                                  • \n
                                    \u91cd\u70b9\u8bf4\u660e\uff1a<\/p>\n
                                      \n
                                    • HIZ<\/p>\n<\/li>\n
                                    • \n
                                      \u95ee\u9898\uff1a\u5728AO\u8fd9\u79cd\u4e0e\u906e\u6321\u5173\u7cfb\u6709\u6781\u5f3a\u5173\u8054\u7684\u7b97\u6cd5\u4e2d\uff0c\u5bf9HIZ\u8fdb\u884c\u7b80\u5355\u7684min\u3001average\u90fd\u662f\u4e0d\u592a\u597d\u7684\uff0c\u5f88\u53ef\u80fd\u51fa\u73b0\u65ad\u5c42\u548c\u4f2a\u5f71<\/strong><\/p>\n
                                        \n
                                      • average\uff1a\u5bf9\u4e8e\u7269\u4f53\u7684\u8fb9\u7f18\uff0c\u57fa\u4e8e2x2\u5757 hiz\uff0c\u4f1a\u5c06\u524d\u666f\u7684depth \u548c \u540e\u666f\u7684depth average\uff0c\u5f97\u51fa\u4e00\u4e2a\u65e2\u4e0d\u5728\u524d\u666f\u4e5f\u4e0d\u5728\u540e\u666f\u7684depth\u3002\u6700\u7ec8\u5bfc\u81f4\u4f2a\u5f71\u7684\u51fa\u73b0<\/li>\n
                                      • min\uff1a\u5f3a\u5236\u4fdd\u7559\u524d\u666f\u6df1\u5ea6\uff0c\u628a\u50cf\u7d20\u62c9\u8fd1\u3002\u5bfc\u81f4\u4e0d\u8be5\u51fa\u73b0AO\u7684\u5730\u65b9\u51fa\u73b0\u4e86AO<\/li>\n<\/ul>\n<\/li>\n
                                      • \u89e3\u51b3\uff1a\u9700\u8981\u4e00\u4e2a\u57fa\u4e8e\u906e\u6321\u5173\u7cfb\u667a\u80fdaverage<\/strong>\u7684\u7b97\u6cd5\n
                                        \u4ee5\u6700\u8fd1depth\u4e3a\u57fa\u51c6\uff0c\u8ba1\u7b972x2\u5757\u4e2d\u5176\u4ed6pixel\u4e0e\u5b83\u7684\u8ddd\u79bb\uff0c\u6839\u636e\u8ddd\u79bb\u4f5c\u4e3a\u6743\u91cd<\/strong>\uff0c\u79bb\u6700\u8fd1depth\u8d8a\u8fdc\uff0c\u6743\u91cd\u8d8a\u4f4e\uff0c\u53ef\u4ee5\u4f7f\u7528ao radius\u4f5c\u4e3a\u6700\u5927\u8ddd\u79bb\u6765\u8ba1\u7b97\u6743\u91cd<\/p>\n
                                        float MipSmartAverage(float4 depths, float effectRadius)\n{\n  float closest = min(min(depths.x, depths.y), min(depths.z, depths.w));\n  float falloffCalcMulSq = -1.0f \/ (effectRadius * effectRadius);\n\n  float4 dists = depths - closest.xxxx;\n  float4 weights = saturate(dists * dists * falloffCalcMulSq + 1.0);\n\n  return dot(weights, depths) \/ dot(weights, float4(1, 1, 1, 1));\n}\n<\/code><\/pre>\n<\/li>\n
                                      • hiz mipmap level<\/p>\n<\/li>\n
                                      • \n
                                        \u95ee\u9898\uff1a\u5982\u4f55\u6b63\u786e\u8ba1\u7b97hiz mipmap level\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u76f4\u63a5\u5173\u7cfb\u5230\u4e86L2\u7684\u547d\u4e2d\u7387<\/p>\n<\/li>\n
                                      • \n
                                        \u89e3\u51b3\uff1a\u9700\u8981\u77e5\u9053hiz mipmap level\u4e0e\u4ec0\u4e48\u76f4\u63a5\u6302\u94a9\uff0c\u7b2c\u4e00\u70b9\u60f3\u5230\u7684\u662fdepth\uff0c\u8fd9\u6b63\u786e\u4f46\u4e0d\u5bf9\u3002\u56e0\u4e3a\u5728AO\u8ba1\u7b97\u4e0b\u4e0er\u534a\u5f84\u76f4\u63a5\u76f8\u5173\uff0c\u4f46\u5728view space\u4e0br\u53c8\u663e\u5f97\u592a\u5c0f\uff0c\u6240\u4ee5\u771f\u6b63\u9700\u8981\u7684\u662f\u5728screen space\u4e0b\uff0cr\u5360\u636e\u4e86\u5c4f\u5e55\u593a\u5c11\u50cf\u7d20\u3002\u5360\u636e\u7684\u5c4f\u5e55\u50cf\u7d20\u8d8a\u5c11\u8bf4\u660e\u79bb\u76f8\u673a\u8d8a\u8fd1\uff0cmipmap level\u5e94\u8be5\u8f83\u4f4e\uff1b\u5360\u636e\u7684\u5c4f\u5e55\u50cf\u7d20\u8d8a\u591a\u8bf4\u660e\u79bb\u76f8\u673a\u8d8a\u8fdc\uff0cmipmap level\u5e94\u8be5\u8f83\u9ad8<\/p>\n<\/li>\n
                                      • \n
                                        \u7b97\u6cd5<\/p>\n
                                        \/\/ g_NDCToViewMul\uff1acameraTanHalfFOV.x * 2.f, -cameraTanHalfFOV.y * 2.f\n\/\/ \u5c4f\u5e55\u4e0a 1 \u4e2a\u50cf\u7d20\u5bf9\u5e94\u7684 View Space \u7269\u7406\u5c3a\u5bf8\nconst float2 pixelDirRBViewspaceSizeAtCenterZ = inputParam.PositionVS.z * g_NDCToViewMul * g_DeinterleavedAOSize.zw;\n\n\/\/ \u5c06 AO \u534a\u5f84\u4ece View Space \u8f6c\u6362\u56de Screen Space\nfloat pixLookupRadiusMod = (0.85f * radius) \/ pixelDirRBViewspaceSizeAtCenterZ.x;\n\nfloat mipLevel = max(0.0f, log2(pixLookupRadiusMod) - 4.3f);\n<\/code><\/pre>\n