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[31] | 1 | //math.c: |
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| 2 | |
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| 3 | #include "libroar.h" |
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| 4 | |
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[34] | 5 | int roar_math_mkpoly (float * poly, float * data, int len) { |
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| 6 | if ( len == 2 ) |
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| 7 | return roar_math_mkpoly_2x2(poly, data); |
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| 8 | if ( len == 3 ) |
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| 9 | return roar_math_mkpoly_3x3(poly, data); |
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| 10 | if ( len == 4 ) |
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| 11 | return roar_math_mkpoly_4x4(poly, data); |
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| 12 | if ( len == 5 ) |
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| 13 | return roar_math_mkpoly_5x5(poly, data); |
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| 14 | |
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| 15 | return -1; |
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| 16 | } |
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| 17 | |
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| 18 | int roar_math_mkpoly_2x2 (float * poly, float * data) { |
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| 19 | /* |
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| 20 | A B |
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| 21 | 0 1 x |
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| 22 | 1 1 y |
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| 23 | |
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| 24 | B = x |
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| 25 | A = y - x |
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| 26 | */ |
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| 27 | |
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| 28 | poly[0] = data[0]; |
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| 29 | poly[1] = data[1] - data[0]; |
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| 30 | |
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| 31 | return 0; |
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| 32 | } |
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[31] | 33 | |
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[34] | 34 | int roar_math_mkpoly_3x3 (float * poly, float * data) { |
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| 35 | /* |
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| 36 | A B C |
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| 37 | 0 0 1 x |
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| 38 | 1 1 1 y |
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| 39 | 4 2 1 z |
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| 40 | */ |
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| 41 | |
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| 42 | poly[0] = data[0]; |
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| 43 | poly[1] = 2*data[1] - 2*data[0] - (data[2]-data[0])/2; |
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| 44 | poly[2] = (data[2]-data[0])/2 - data[1] + data[0]; |
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| 45 | |
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| 46 | |
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| 47 | return 0; |
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| 48 | } |
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| 49 | |
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| 50 | int roar_math_mkpoly_4x4 (float * poly, float * data) { |
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| 51 | /* |
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| 52 | a b c d |
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| 53 | 0 0 0 1 A X 0 |
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| 54 | 1 1 1 1 B Y 1 |
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| 55 | 8 4 2 1 C Z 2 |
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| 56 | 27 9 3 1 D Q 3 |
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| 57 | */ |
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| 58 | |
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| 59 | |
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| 60 | // { a = -(3z-3y+x-q)/6, b = (4z-5y+2x-q)/2, c = -(9z-18y+11x-2q)/6, d = x }. |
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| 61 | |
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| 62 | poly[0] = data[0]; |
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| 63 | poly[1] = -(11*data[0] - 18*data[1] + 9*data[2] - 2*data[3])/6; |
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| 64 | poly[2] = (2 *data[0] - 5*data[1] + 4*data[2] - data[3])/2; |
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| 65 | poly[3] = -( data[0] - 3*data[1] + 3*data[2] - data[3])/6; |
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| 66 | |
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| 67 | return 0; |
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| 68 | } |
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| 69 | |
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[49] | 70 | int roar_math_mkpoly_5x5 (float * poly, float * data) { |
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| 71 | return -1; |
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| 72 | } |
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[31] | 73 | |
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| 74 | //ll |
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