85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
// Copyright 2009-2021 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "../common/geometry.h"
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namespace embree
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{
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static const size_t MAX_PATCH_VALENCE = 16; //!< maximum number of vertices of a patch
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static const size_t MAX_RING_FACE_VALENCE = 64; //!< maximum number of faces per ring
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static const size_t MAX_RING_EDGE_VALENCE = 2*64; //!< maximum number of edges per ring
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class CatmullClarkPrecomputedCoefficients
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{
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private:
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float table_cos_2PI_div_n[MAX_RING_FACE_VALENCE+1];
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float* table_limittangent_a[MAX_RING_FACE_VALENCE+1];
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float* table_limittangent_b[MAX_RING_FACE_VALENCE+1];
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float table_limittangent_c[MAX_RING_FACE_VALENCE+1];
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__forceinline float set_cos_2PI_div_n(const size_t n) {
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if (unlikely(n == 0)) return 1.0f;
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return cosf(2.0f*float(pi)/(float)n);
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}
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__forceinline float set_limittangent_a(const size_t i, const size_t n)
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{
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if (unlikely(n == 0)) return 1.0f;
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const float c0 = 1.0f/(float)n * 1.0f / sqrtf(4.0f + cosf(float(pi)/(float)n)*cosf(float(pi)/(float)n));
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const float c1 = (1.0f/(float)n + cosf(float(pi)/(float)n) * c0);
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return cosf(2.0f*float(pi)*(float)i/(float)n) * c1;
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}
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__forceinline float set_limittangent_b(const size_t i, const size_t n)
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{
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if (unlikely(n == 0)) return 1.0f;
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const float c0 = 1.0f/(float)n * 1.0f / sqrtf(4.0f + cosf(float(pi)/(float)n)*cosf(float(pi)/(float)n));
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return cosf((2.0f*float(pi)*i+float(pi))/(float)n) * c0;
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}
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__forceinline float set_limittangent_c(const size_t n)
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{
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if (unlikely(n == 0)) return 1.0f;
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return 2.0f/16.0f * (5.0f + cosf(2.0f*float(pi)/(float)n) + cosf(float(pi)/(float)n) * sqrtf(18.0f+2.0f*cosf(2.0f*float(pi)/(float)n)));
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}
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public:
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__forceinline float cos_2PI_div_n(const size_t n)
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{
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if (likely(n <= MAX_RING_FACE_VALENCE))
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return table_cos_2PI_div_n[n];
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else
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return set_cos_2PI_div_n(n);
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}
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__forceinline float limittangent_a(const size_t i, const size_t n)
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{
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assert(n <= MAX_RING_FACE_VALENCE);
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assert(i < n);
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return table_limittangent_a[n][i];
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}
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__forceinline float limittangent_b(const size_t i, const size_t n)
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{
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assert(n <= MAX_RING_FACE_VALENCE);
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assert(i < n);
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return table_limittangent_b[n][i];
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}
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__forceinline float limittangent_c(const size_t n)
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{
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assert(n <= MAX_RING_FACE_VALENCE);
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return table_limittangent_c[n];
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}
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static CatmullClarkPrecomputedCoefficients table;
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CatmullClarkPrecomputedCoefficients();
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~CatmullClarkPrecomputedCoefficients();
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};
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}
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