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annotate src/dmcurves.c @ 2294:7f6ba3b32f54

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Cleanups.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 03 Jul 2019 10:28:43 +0300
parents 7df95aefb9c6
children
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rev   line source
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1 /*
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2 * DMLib
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3 * -- Curve and spline functions
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2015 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmcurves.h"
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8
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9
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10 void dmLerpInit(DMLerpContext *ctx, DMFloat start, DMFloat end, DMFloat nsteps)
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11 {
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12 ctx->start = start;
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13 ctx->end = end;
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14 ctx->nsteps = nsteps;
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15 }
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16
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17
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18 DMFloat dmCatmullRom(const DMFloat t, const DMFloat p0, const DMFloat p1, const DMFloat p2, const DMFloat p3)
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19 {
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20 const DMFloat q = t * t;
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21 return (
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22 (2 * p1) +
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23 (-p0 + p2) * t +
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24 (2 * p0 - 5 * p1 + 4 * p2 - p3) * q +
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25 ( -p0 + 3 * p1 - 3 * p2 + p3) * q * t
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26 ) * 0.5f;
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27 }
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28
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29
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30 static inline const DMVector *dmSplineGetPoint(const DMVector *points, const int npoints, const int n)
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31 {
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32 return (n < 0) ? &points[0] : ((n < npoints) ? &points[n] : &points[npoints - 1]);
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33 }
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34
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35
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36 int dmBSplineGenerate(const DMVector *points, const int npoints, const int slod,
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37 int (*callback)(void *data, const int ndst, const int nc, float x, float y, float z),
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38 void *data, const int ndst)
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39 {
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40 int cv, j;
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41
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42 for (cv = -3, j = 0; j != npoints + 1; j++, cv++)
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43 {
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44 // for each section of curve, draw 'lod' number of divisions
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45 int i;
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46 for (i = 0; i != slod; i++)
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47 {
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48 int ret;
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49 const float t = (float) i / slod;
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50 const float it = 1.0f - t;
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51
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52 // Calculate blending functions for cubic bspline
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53 const float t2 = t * t;
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54 const float t3 = t2 * t;
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55 const float b0 = it * it * it / 6.0f;
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56 const float b1 = ( 3*t3 - 6*t2 + 4) / 6.0f;
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57 const float b2 = (-3*t3 + 3*t2 + 3*t + 1) / 6.0f;
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58 const float b3 = t3 / 6.0f;
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59
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60 // Calculate coordinates of the curve point
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61 if ((ret = callback(data, ndst, j,
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62 b0 * dmSplineGetPoint(points, npoints, cv + 0)->x +
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63 b1 * dmSplineGetPoint(points, npoints, cv + 1)->x +
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64 b2 * dmSplineGetPoint(points, npoints, cv + 2)->x +
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65 b3 * dmSplineGetPoint(points, npoints, cv + 3)->x
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66 ,
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67 b0 * dmSplineGetPoint(points, npoints, cv + 0)->y +
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68 b1 * dmSplineGetPoint(points, npoints, cv + 1)->y +
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69 b2 * dmSplineGetPoint(points, npoints, cv + 2)->y +
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70 b3 * dmSplineGetPoint(points, npoints, cv + 3)->y
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71 ,
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72 b0 * dmSplineGetPoint(points, npoints, cv + 0)->z +
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73 b1 * dmSplineGetPoint(points, npoints, cv + 1)->z +
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74 b2 * dmSplineGetPoint(points, npoints, cv + 2)->z +
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75 b3 * dmSplineGetPoint(points, npoints, cv + 3)->z
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76 )) != DMERR_OK)
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77 return ret;
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78 }
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79 }
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80
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81 return DMERR_OK;
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82 }
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83
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84
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85 /*
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86 static int dmSplineAddGL(void *data, const int ndst, const int nc, float x, float y, float z)
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87 {
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88 (void) data;
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89 glVertex3f(x, y, z);
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90 return DMERR_OK;
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91 }
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92
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93
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94 int dmGLBSpline(const DMVector *points, const int npoints, const int slod)
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95 {
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96 // begin drawing our curve
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97 glBegin(GL_LINE_STRIP);
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98
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99 return dmBSplineGenerate(points, npoints, slod, dmSplineAddGL, NULL, 0);
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100
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101 // we need to specify the last point on the curve
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102 glVertex3fv(points[npoints - 1]);
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103 glEnd();
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104 }
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105 */
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106
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107
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108 static int dmSplineAddVector(void *data, const int ndst, const int nc, float x, float y, float z)
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109 {
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110 if (nc < ndst)
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111 {
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112 DMVector **dst = (DMVector **) data;
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113
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114 (*dst)->x = x;
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115 (*dst)->y = y;
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116 (*dst)->z = z;
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117
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118 (*dst)++;
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119 return DMERR_OK;
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120 }
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121 else
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122 return DMERR_BOUNDS;
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123 }
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124
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125
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126 int dmBSplineGenerateArray(DMVector *dst, const int ndst, const DMVector *points, const int npoints, const int slod)
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127 {
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128 return dmBSplineGenerate(points, npoints, slod, dmSplineAddVector, &dst, ndst);
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129 }
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130
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131
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132 int dmBSplineGenerateAlloc(DMVector **dst, int *ndst, const DMVector *points, const int npoints, const int slod)
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133 {
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134 if (ndst == NULL || dst == NULL)
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135 return DMERR_NULLPTR;
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136
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137 if ((*ndst = dmBSplineGetNPoints(npoints, slod)) <= 0)
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138 return DMERR_INVALID_DATA;
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139
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140 if ((*dst = dmCalloc(*ndst, sizeof(DMVector))) == NULL)
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141 return DMERR_MALLOC;
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142
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143 return dmBSplineGenerate(points, npoints, slod, dmSplineAddVector, *dst, *ndst);
976
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144 }