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annotate pytouhou/utils/matrix.pyx @ 613:560b45a7d014

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Don’t uselessly malloc() a matrix for multiply, the stack is here for that!
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sat, 28 Mar 2015 19:58:50 +0100
parents e15672733c93
children e5361b74b9ad
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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14
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15 from libc.math cimport sin, cos
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16 from libc.stdlib cimport malloc, free
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17 from libc.string cimport memcpy
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19
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20 cdef Matrix identity
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21 identity = Matrix(1, 0, 0, 0,
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22 0, 1, 0, 0,
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23 0, 0, 1, 0,
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24 0, 0, 0, 1)
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27 cdef Matrix *new_matrix(Matrix *data) nogil:
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28 mat = <Matrix*> malloc(sizeof(Matrix))
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29 memcpy(mat, data, sizeof(Matrix))
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30 return mat
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31
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32
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33 cdef Matrix *new_identity() nogil:
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34 return new_matrix(&identity)
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37 cdef void mul(Matrix *mat1, Matrix *mat2) nogil:
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38 cdef float *d3
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39 cdef Matrix out
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41 d1 = <float*>mat1
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42 d2 = <float*>mat2
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43 d3 = <float*>&out
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44 for i in range(4):
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45 for j in range(4):
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46 d3[4*i+j] = 0
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47 for k in range(4):
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48 d3[4*i+j] += d1[4*i+k] * d2[4*k+j]
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49 memcpy(mat1, &out, sizeof(Matrix))
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51
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52 cdef void flip(Matrix *mat) nogil:
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53 data = <float*>mat
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55 data[i] = -data[i]
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57
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58 cdef void scale(Matrix *mat, float x, float y, float z) nogil:
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59 cdef float coordinate[3]
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60
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61 data = <float*>mat
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62 coordinate[0] = x
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63 coordinate[1] = y
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64 coordinate[2] = z
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66 for i in range(3):
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67 for j in range(4):
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68 data[4*i+j] *= coordinate[i]
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71 cdef void scale2d(Matrix *mat, float x, float y) nogil:
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72 data = <float*>mat
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73 for i in range(4):
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74 data[ i] *= x
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75 data[4+i] *= y
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78 cdef void translate(Matrix *mat, float[3] offset) nogil:
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79 cdef float item[3]
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81 data = <float*>mat
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82 for i in range(3):
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83 item[i] = data[12+i] * offset[i]
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84
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87 data[4*i+j] += item[i]
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89
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90 cdef void translate2d(Matrix *mat, float x, float y) nogil:
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91 cdef float[3] offset
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92
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93 offset[0] = x
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94 offset[1] = y
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95 offset[2] = 0
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96
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97 translate(mat, offset)
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99
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100 cdef void rotate_x(Matrix *mat, float angle) nogil:
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101 cdef float cos_a, sin_a
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102 cdef float lines[8]
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103
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104 data = <float*>mat
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105 cos_a = cos(angle)
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106 sin_a = sin(angle)
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107 for i in range(8):
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108 lines[i] = data[i+4]
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110 data[4+i] = cos_a * lines[i] - sin_a * lines[4+i]
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111 data[8+i] = sin_a * lines[i] + cos_a * lines[4+i]
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113
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114 cdef void rotate_y(Matrix *mat, float angle) nogil:
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115 cdef float cos_a, sin_a
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116 cdef float lines[8]
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117
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118 data = <float*>mat
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119 cos_a = cos(angle)
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120 sin_a = sin(angle)
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121 for i in range(4):
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122 lines[i] = data[i]
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123 lines[i+4] = data[i+8]
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125 data[ i] = cos_a * lines[i] + sin_a * lines[4+i]
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126 data[8+i] = -sin_a * lines[i] + cos_a * lines[4+i]
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128
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129 cdef void rotate_z(Matrix *mat, float angle) nogil:
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130 cdef float cos_a, sin_a
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131 cdef float lines[8]
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133 data = <float*>mat
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134 cos_a = cos(angle)
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135 sin_a = sin(angle)
590
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136 for i in range(8):
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137 lines[i] = data[i]
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138 for i in range(4):
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139 data[ i] = cos_a * lines[i] - sin_a * lines[4+i]
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140 data[4+i] = sin_a * lines[i] + cos_a * lines[4+i]