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43 行
895 B
43 行
895 B
#ifndef __CLUSTEREDUTILS_H__
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#define __CLUSTEREDUTILS_H__
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int SnapToClusterIdx(float z_in, float fModulUserScale)
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{
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#ifdef LEFT_HAND_COORDINATES
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float z = z_in;
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#else
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float z = -z_in;
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#endif
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float userscale = g_fClustScale;
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#ifdef ENABLE_DEPTH_TEXTURE_BACKPLANE
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userscale *= fModulUserScale;
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#endif
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// using the inverse of the geometric series
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const float dist = max(0, z-g_fNearPlane);
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return (int) clamp( log2(dist*userscale*(g_fClustBase-1.0f) + 1) / log2(g_fClustBase), 0.0, (float) ((1<<g_iLog2NumClusters)-1) );
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}
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float ClusterIdxToZ(int k, float fModulUserScale)
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{
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float res;
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float userscale = g_fClustScale;
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#ifdef ENABLE_DEPTH_TEXTURE_BACKPLANE
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userscale *= fModulUserScale;
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#endif
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float dist = (pow(g_fClustBase,(float) k)-1.0)/(userscale*(g_fClustBase-1.0f));
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res = dist+g_fNearPlane;
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#ifdef LEFT_HAND_COORDINATES
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return res;
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#else
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return -res;
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#endif
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}
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#endif
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