alexpete
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
/*
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* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
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* its licensors.
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*
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* For complete copyright and license terms please see the LICENSE at the root of this
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* distribution (the "License"). All use of this software is governed by the License,
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* or, if provided, by the license below or the license accompanying this file. Do not
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* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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*/
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inline float InvertDepth(float depth)
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{
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// Convert depth from [1.0 - 0.0] to [0.0 - 1.0].
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// Set the front(near side) to 0.0 and the back(far side) to 1.0.
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return 1.0f - depth;
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}
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inline float ConvertDofFactor(float depth, float far, float near, float focusDistance)
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{
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// dofFactor : The value Calculated from depth.
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// This is used to calculate blend ratio from dofFactor when combining buffers.
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// dofFactor = (z-L)/z
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// = ((far-near)*L/far*near) * depth + (1-L/near)
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// = cameraFactor.x * depth + cameraFactor.y
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// L : target object distance.
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// z : camera (depthLinear)
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// z = -far*near / (far*depth - near*depth - far) [from (depth[0-1] = (far*(z-near)/(far-near)/z))]
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float z = -far*near / (far*depth - near*depth - far);
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float dofFactor = (z - focusDistance) / z;
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return dofFactor;
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}
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inline float ConvertBlend(float dofFactor, float2 blendFactor)
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{
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return dofFactor * blendFactor.x + blendFactor.y;
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}
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inline float4 ConvertBlendsFloat4(float4 dofFactors, float2 blendFactor)
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{
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return dofFactors * blendFactor.x + blendFactor.y;
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}
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