metasurf

annotate examples/metaballs/src/cam.c @ 0:7aa4627e492b

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first commit
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 25 Oct 2011 07:34:31 +0300
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nuclear@0 1 #include <math.h>
nuclear@0 2 #include "cam.h"
nuclear@0 3
nuclear@0 4 #if defined(__APPLE__) && defined(__MACH__)
nuclear@0 5 #include <OpenGL/gl.h>
nuclear@0 6 #else
nuclear@0 7 #include <GL/gl.h>
nuclear@0 8 #endif
nuclear@0 9
nuclear@0 10 #define DR (M_PI / 180.0)
nuclear@0 11 #define DEG_TO_RAD(x) ((x) * DR)
nuclear@0 12
nuclear@0 13 typedef struct vec3 {
nuclear@0 14 float x, y, z;
nuclear@0 15 } vec3_t;
nuclear@0 16
nuclear@0 17 /* viewing parameters */
nuclear@0 18 #define DEF_THETA 0
nuclear@0 19 #define DEF_PHI 0
nuclear@0 20 #define DEF_DIST 0
nuclear@0 21 #define DEF_X 0
nuclear@0 22 #define DEF_Y 0
nuclear@0 23 #define DEF_Z 0
nuclear@0 24
nuclear@0 25 static float cam_theta = DEF_THETA, cam_phi = DEF_PHI;
nuclear@0 26 static float cam_dist = DEF_DIST;
nuclear@0 27 static vec3_t cam_pos = {DEF_X, DEF_Y, DEF_Z};
nuclear@0 28
nuclear@0 29 /* projection parameters */
nuclear@0 30 #define DEF_VFOV 45.0
nuclear@0 31 #define DEF_ASPECT 1.3333333
nuclear@0 32 #define DEF_NEAR 1.0
nuclear@0 33 #define DEF_FAR 1000.0
nuclear@0 34
nuclear@0 35 static float vfov = DEF_VFOV;
nuclear@0 36 static float aspect = DEF_ASPECT;
nuclear@0 37 static float nearclip = DEF_NEAR, farclip = DEF_FAR;
nuclear@0 38
nuclear@0 39 /* stereo parameters */
nuclear@0 40 #define DEF_EYE_SEP 0.1
nuclear@0 41 #define DEF_FOCUS_DIST 1.0
nuclear@0 42
nuclear@0 43 static float eye_sep = DEF_EYE_SEP;
nuclear@0 44 static float focus_dist = DEF_FOCUS_DIST;
nuclear@0 45
nuclear@0 46 static float pan_speed = 0.001;
nuclear@0 47 static float rot_speed = 0.5;
nuclear@0 48 static float zoom_speed = 0.1;
nuclear@0 49
nuclear@0 50 static float vmin_deg = -90.0, vmax_deg = 90.0;
nuclear@0 51
nuclear@0 52 void cam_reset(void)
nuclear@0 53 {
nuclear@0 54 cam_reset_view();
nuclear@0 55 cam_reset_proj();
nuclear@0 56 cam_reset_stereo();
nuclear@0 57 }
nuclear@0 58
nuclear@0 59 void cam_reset_view(void)
nuclear@0 60 {
nuclear@0 61 cam_theta = DEF_THETA;
nuclear@0 62 cam_phi = DEF_PHI;
nuclear@0 63 cam_dist = DEF_DIST;
nuclear@0 64 cam_pos.x = DEF_X;
nuclear@0 65 cam_pos.y = DEF_Y;
nuclear@0 66 cam_pos.z = DEF_Z;
nuclear@0 67 }
nuclear@0 68
nuclear@0 69 void cam_reset_proj(void)
nuclear@0 70 {
nuclear@0 71 vfov = DEF_VFOV;
nuclear@0 72 aspect = DEF_ASPECT;
nuclear@0 73 nearclip = DEF_NEAR;
nuclear@0 74 farclip = DEF_FAR;
nuclear@0 75 }
nuclear@0 76
nuclear@0 77 void cam_reset_stereo(void)
nuclear@0 78 {
nuclear@0 79 eye_sep = DEF_EYE_SEP;
nuclear@0 80 focus_dist = DEF_FOCUS_DIST;
nuclear@0 81 }
nuclear@0 82
nuclear@0 83 void cam_set_vrange(float min_deg, float max_deg)
nuclear@0 84 {
nuclear@0 85 vmin_deg = min_deg;
nuclear@0 86 vmax_deg = max_deg;
nuclear@0 87 }
nuclear@0 88
nuclear@0 89 void cam_move(float x, float y, float z)
nuclear@0 90 {
nuclear@0 91 cam_pos.x += x;
nuclear@0 92 cam_pos.y += y;
nuclear@0 93 cam_pos.z += z;
nuclear@0 94 }
nuclear@0 95
nuclear@0 96 void cam_rotate(float theta, float phi)
nuclear@0 97 {
nuclear@0 98 cam_phi += phi;
nuclear@0 99 cam_theta += theta;
nuclear@0 100 }
nuclear@0 101
nuclear@0 102 void cam_dolly(float dist)
nuclear@0 103 {
nuclear@0 104 cam_dist += dist;
nuclear@0 105 }
nuclear@0 106
nuclear@0 107 void cam_inp_pan_speed(float speed)
nuclear@0 108 {
nuclear@0 109 pan_speed = speed;
nuclear@0 110 }
nuclear@0 111
nuclear@0 112 void cam_inp_rotate_speed(float speed)
nuclear@0 113 {
nuclear@0 114 rot_speed = speed;
nuclear@0 115 }
nuclear@0 116
nuclear@0 117 void cam_inp_zoom_speed(float speed)
nuclear@0 118 {
nuclear@0 119 zoom_speed = speed;
nuclear@0 120 }
nuclear@0 121
nuclear@0 122
nuclear@0 123 void cam_inp_pan(int dx, int dy)
nuclear@0 124 {
nuclear@0 125 float dxf = dx * pan_speed;
nuclear@0 126 float dyf = dy * pan_speed;
nuclear@0 127 float angle = -DEG_TO_RAD(cam_theta);
nuclear@0 128
nuclear@0 129 cam_pos.x += cos(angle) * dxf + sin(angle) * dyf;
nuclear@0 130 cam_pos.z += -sin(angle) * dxf + cos(angle) * dyf;
nuclear@0 131 }
nuclear@0 132
nuclear@0 133 void cam_inp_height(int dh)
nuclear@0 134 {
nuclear@0 135 cam_pos.y += dh * pan_speed;
nuclear@0 136 }
nuclear@0 137
nuclear@0 138 void cam_inp_rotate(int dx, int dy)
nuclear@0 139 {
nuclear@0 140 cam_theta += dx * rot_speed;
nuclear@0 141 cam_phi += dy * rot_speed;
nuclear@0 142
nuclear@0 143 if(cam_phi < vmin_deg) cam_phi = vmin_deg;
nuclear@0 144 if(cam_phi > vmax_deg) cam_phi = vmax_deg;
nuclear@0 145 }
nuclear@0 146
nuclear@0 147 void cam_inp_zoom(int dz)
nuclear@0 148 {
nuclear@0 149 cam_dist += dz * zoom_speed;
nuclear@0 150 if(cam_dist < 0.001) {
nuclear@0 151 cam_dist = 0.001;
nuclear@0 152 }
nuclear@0 153 }
nuclear@0 154
nuclear@0 155 void cam_clip(float n, float f)
nuclear@0 156 {
nuclear@0 157 nearclip = n;
nuclear@0 158 farclip = f;
nuclear@0 159 }
nuclear@0 160
nuclear@0 161 void cam_fov(float f)
nuclear@0 162 {
nuclear@0 163 vfov = f;
nuclear@0 164 }
nuclear@0 165
nuclear@0 166 void cam_aspect(float a)
nuclear@0 167 {
nuclear@0 168 aspect = a;
nuclear@0 169 }
nuclear@0 170
nuclear@0 171 void cam_separation(float s)
nuclear@0 172 {
nuclear@0 173 eye_sep = s;
nuclear@0 174 }
nuclear@0 175
nuclear@0 176 void cam_focus_dist(float d)
nuclear@0 177 {
nuclear@0 178 focus_dist = d;
nuclear@0 179
nuclear@0 180 cam_separation(d / 30.0);
nuclear@0 181 }
nuclear@0 182
nuclear@0 183 void cam_view_matrix(void)
nuclear@0 184 {
nuclear@0 185 cam_stereo_view_matrix(CAM_CENTER);
nuclear@0 186 }
nuclear@0 187
nuclear@0 188 void cam_stereo_view_matrix(int eye)
nuclear@0 189 {
nuclear@0 190 static const float offs_sign[] = {0.0f, 0.5f, -0.5f}; /* center, left, right */
nuclear@0 191 float offs = eye_sep * offs_sign[eye];
nuclear@0 192
nuclear@0 193 glTranslatef(offs, 0, 0);
nuclear@0 194
nuclear@0 195 glTranslatef(0, 0, -cam_dist);
nuclear@0 196 glRotatef(cam_phi, 1, 0, 0);
nuclear@0 197 glRotatef(cam_theta, 0, 1, 0);
nuclear@0 198 glTranslatef(-cam_pos.x, -cam_pos.y, -cam_pos.z);
nuclear@0 199 }
nuclear@0 200
nuclear@0 201 void cam_proj_matrix(void)
nuclear@0 202 {
nuclear@0 203 cam_stereo_proj_matrix(CAM_CENTER);
nuclear@0 204 }
nuclear@0 205
nuclear@0 206 void cam_stereo_proj_matrix(int eye)
nuclear@0 207 {
nuclear@0 208 float vfov_rad = M_PI * vfov / 180.0;
nuclear@0 209 float top = nearclip * tan(vfov_rad * 0.5);
nuclear@0 210 float right = top * aspect;
nuclear@0 211
nuclear@0 212 static const float offs_sign[] = {0.0f, 1.0, -1.0}; /* center, left, right */
nuclear@0 213 float frust_shift = offs_sign[eye] * (eye_sep * 0.5 * nearclip / focus_dist);
nuclear@0 214
nuclear@0 215 glFrustum(-right + frust_shift, right + frust_shift, -top, top, nearclip, farclip);
nuclear@0 216 }