libgoatvr

annotate src/vr.c @ 5:e63cb28fc644

find changesets by author, revision, files, or words in the commit message
working on the linux side a bit
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 18 Sep 2014 10:56:45 +0300
parents ded3d0a74e19
children 6896f9cf9621
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <string.h>
nuclear@5 3 #include "opengl.h"
nuclear@0 4 #include "vr.h"
nuclear@0 5 #include "vr_impl.h"
nuclear@0 6 #include "mathutil.h"
nuclear@0 7
nuclear@0 8
nuclear@5 9 static void fallback_present(void);
nuclear@0 10
nuclear@0 11
nuclear@0 12 static struct vr_module *vrm;
nuclear@0 13 static float idmat[] = {
nuclear@0 14 1, 0, 0, 0,
nuclear@0 15 0, 1, 0, 0,
nuclear@0 16 0, 0, 1, 0,
nuclear@0 17 0, 0, 0, 1
nuclear@0 18 };
nuclear@0 19 static float fbtex_rect[] = {
nuclear@0 20 0, 0, 1, 1
nuclear@0 21 };
nuclear@0 22
nuclear@5 23 static void *defopt; /* default options db */
nuclear@5 24
nuclear@5 25 static struct {
nuclear@5 26 float umin, umax, vmin, vmax;
nuclear@5 27 int tex;
nuclear@5 28 } rtarg[2];
nuclear@5 29
nuclear@5 30
nuclear@0 31 int vr_init(void)
nuclear@0 32 {
nuclear@0 33 int i, nmodules;
nuclear@0 34
nuclear@5 35 /* create the default options database */
nuclear@5 36 if(!defopt && (defopt = create_options())) {
nuclear@5 37 set_option_float(defopt, VR_OPT_EYE_HEIGHT, 1.675);
nuclear@5 38 set_option_float(defopt, VR_OPT_IPD, 0.064);
nuclear@5 39 }
nuclear@5 40
nuclear@0 41 if(vrm) {
nuclear@0 42 vr_shutdown();
nuclear@0 43 }
nuclear@0 44
nuclear@0 45 vr_init_modules();
nuclear@0 46
nuclear@0 47 nmodules = vr_get_num_modules();
nuclear@0 48 for(i=0; i<nmodules; i++) {
nuclear@0 49 struct vr_module *m = vr_get_module(i);
nuclear@0 50 if(m->init() != -1) {
nuclear@0 51 /* add to the active modules array */
nuclear@0 52 vr_activate_module(i);
nuclear@0 53 if(!vrm) {
nuclear@0 54 vr_use_module(0);
nuclear@0 55 }
nuclear@0 56 }
nuclear@0 57 }
nuclear@0 58
nuclear@0 59 if(!vrm) {
nuclear@0 60 return -1;
nuclear@0 61 }
nuclear@0 62 return 0;
nuclear@0 63 }
nuclear@0 64
nuclear@0 65 void vr_shutdown(void)
nuclear@0 66 {
nuclear@0 67 vr_clear_modules();
nuclear@0 68 vrm = 0;
nuclear@0 69 fbtex_rect[0] = fbtex_rect[1] = 0;
nuclear@0 70 fbtex_rect[2] = fbtex_rect[3] = 1;
nuclear@0 71 }
nuclear@0 72
nuclear@0 73 int vr_module_count(void)
nuclear@0 74 {
nuclear@0 75 return vr_get_num_active_modules();
nuclear@0 76 }
nuclear@0 77
nuclear@0 78 const char *vr_module_name(int idx)
nuclear@0 79 {
nuclear@0 80 struct vr_module *m = vr_get_active_module(idx);
nuclear@0 81 if(!m) {
nuclear@0 82 return 0;
nuclear@0 83 }
nuclear@0 84 return m->name;
nuclear@0 85 }
nuclear@0 86
nuclear@0 87 int vr_use_module(int idx)
nuclear@0 88 {
nuclear@0 89 if(idx >= 0 && idx < vr_get_num_active_modules()) {
nuclear@0 90 struct vr_module *m = vr_get_active_module(idx);
nuclear@0 91 if(m != vrm) {
nuclear@0 92 vrm = m;
nuclear@0 93 printf("using vr module: %s\n", vrm->name);
nuclear@0 94 }
nuclear@0 95 return 0;
nuclear@0 96 }
nuclear@0 97 return -1;
nuclear@0 98 }
nuclear@0 99
nuclear@0 100 int vr_use_module_named(const char *name)
nuclear@0 101 {
nuclear@0 102 int i, count = vr_get_num_active_modules();
nuclear@0 103
nuclear@0 104 for(i=0; i<count; i++) {
nuclear@0 105 struct vr_module *m = vr_get_active_module(i);
nuclear@0 106 if(strcmp(m->name, name) == 0) {
nuclear@0 107 return vr_use_module(i);
nuclear@0 108 }
nuclear@0 109 }
nuclear@0 110 return -1;
nuclear@0 111 }
nuclear@0 112
nuclear@0 113 void vr_set_opti(const char *optname, int val)
nuclear@0 114 {
nuclear@0 115 if(vrm && vrm->set_option) {
nuclear@0 116 vrm->set_option(optname, OTYPE_INT, &val);
nuclear@5 117 } else {
nuclear@5 118 set_option_int(defopt, optname, val);
nuclear@0 119 }
nuclear@0 120 }
nuclear@0 121
nuclear@0 122 void vr_set_optf(const char *optname, float val)
nuclear@0 123 {
nuclear@0 124 if(vrm && vrm->set_option) {
nuclear@0 125 vrm->set_option(optname, OTYPE_FLOAT, &val);
nuclear@5 126 } else {
nuclear@5 127 set_option_float(defopt, optname, val);
nuclear@0 128 }
nuclear@0 129 }
nuclear@0 130
nuclear@0 131 int vr_get_opti(const char *optname)
nuclear@0 132 {
nuclear@0 133 int res = 0;
nuclear@0 134
nuclear@5 135 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {
nuclear@5 136 get_option_int(defopt, optname, &res); /* fallback */
nuclear@0 137 }
nuclear@0 138 return res;
nuclear@0 139 }
nuclear@0 140
nuclear@0 141 float vr_get_optf(const char *optname)
nuclear@0 142 {
nuclear@0 143 float res = 0.0f;
nuclear@0 144
nuclear@5 145 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {
nuclear@5 146 get_option_float(defopt, optname, &res); /* fallback */
nuclear@0 147 }
nuclear@0 148 return res;
nuclear@0 149 }
nuclear@0 150
nuclear@0 151
nuclear@0 152 int vr_view_translation(int eye, float *vec)
nuclear@0 153 {
nuclear@0 154 if(vrm && vrm->translation) {
nuclear@0 155 vrm->translation(eye, vec);
nuclear@0 156 return 1;
nuclear@0 157 }
nuclear@0 158 vec[0] = vec[1] = vec[2] = 0.0f;
nuclear@0 159 return 0;
nuclear@0 160 }
nuclear@0 161
nuclear@0 162 int vr_view_rotation(int eye, float *quat)
nuclear@0 163 {
nuclear@0 164 if(vrm && vrm->rotation) {
nuclear@0 165 vrm->rotation(eye, quat);
nuclear@0 166 return 1;
nuclear@0 167 }
nuclear@0 168 quat[0] = quat[1] = quat[2] = 0.0f;
nuclear@0 169 quat[3] = 1.0f;
nuclear@0 170 return 0;
nuclear@0 171 }
nuclear@0 172
nuclear@0 173 int vr_view_matrix(int eye, float *mat)
nuclear@0 174 {
nuclear@0 175 int have_trans, have_rot;
nuclear@0 176 float offs[3], quat[4];
nuclear@0 177 float rmat[16], tmat[16];
nuclear@0 178
nuclear@0 179 if(vrm && vrm->view_matrix) {
nuclear@0 180 vrm->view_matrix(eye, mat);
nuclear@0 181 return 1;
nuclear@0 182 }
nuclear@0 183
nuclear@0 184 have_trans = vr_view_translation(eye, offs);
nuclear@0 185 have_rot = vr_view_rotation(eye, quat);
nuclear@0 186
nuclear@0 187 if(!have_trans && !have_rot) {
nuclear@5 188 memcpy(mat, idmat, sizeof idmat);
nuclear@0 189 return 0;
nuclear@0 190 }
nuclear@0 191
nuclear@0 192 offs[0] = -offs[0];
nuclear@0 193 offs[1] = -offs[1];
nuclear@0 194 offs[2] = -offs[2];
nuclear@0 195
nuclear@0 196 translation_matrix(offs, tmat);
nuclear@0 197 rotation_matrix(quat, rmat);
nuclear@0 198 mult_matrix(mat, tmat, rmat);
nuclear@0 199 return 1;
nuclear@0 200 }
nuclear@0 201
nuclear@0 202 int vr_proj_matrix(int eye, float znear, float zfar, float *mat)
nuclear@0 203 {
nuclear@0 204 if(vrm && vrm->proj_matrix) {
nuclear@0 205 vrm->proj_matrix(eye, znear, zfar, mat);
nuclear@0 206 return 1;
nuclear@0 207 }
nuclear@0 208 memcpy(mat, idmat, sizeof idmat);
nuclear@0 209 return 0;
nuclear@0 210 }
nuclear@0 211
nuclear@0 212 void vr_begin(int eye)
nuclear@0 213 {
nuclear@0 214 if(vrm && vrm->begin) {
nuclear@0 215 vrm->begin(eye);
nuclear@0 216 }
nuclear@0 217 }
nuclear@0 218
nuclear@0 219 void vr_end(void)
nuclear@0 220 {
nuclear@0 221 if(vrm && vrm->end) {
nuclear@0 222 vrm->end();
nuclear@0 223 }
nuclear@0 224 }
nuclear@0 225
nuclear@0 226 int vr_swap_buffers(void)
nuclear@0 227 {
nuclear@0 228 int res = 0;
nuclear@0 229
nuclear@0 230 if(vrm && vrm->present) {
nuclear@0 231 res = vrm->present();
nuclear@0 232 }
nuclear@0 233
nuclear@0 234 if(!res) {
nuclear@5 235 fallback_present();
nuclear@5 236 vr_gl_swap_buffers();
nuclear@0 237 }
nuclear@0 238 return 0;
nuclear@0 239 }
nuclear@0 240
nuclear@0 241 void vr_output_texture(unsigned int tex, float umin, float vmin, float umax, float vmax)
nuclear@0 242 {
nuclear@0 243 float halfu = (umax + umin) * 0.5f;
nuclear@0 244
nuclear@0 245 vr_output_texture_eye(VR_EYE_LEFT, tex, umin, vmin, halfu, vmax);
nuclear@0 246 vr_output_texture_eye(VR_EYE_RIGHT, tex, halfu, vmin, umax, vmax);
nuclear@0 247 }
nuclear@0 248
nuclear@0 249 void vr_output_texture_eye(int eye, unsigned int tex, float umin, float vmin, float umax, float vmax)
nuclear@0 250 {
nuclear@0 251 if(vrm && vrm->set_eye_texture) {
nuclear@0 252 vrm->set_eye_texture(eye, tex, umin, vmin, umax, vmax);
nuclear@5 253 } else {
nuclear@5 254 rtarg[eye].tex = tex;
nuclear@5 255 rtarg[eye].umin = umin;
nuclear@5 256 rtarg[eye].umax = umax;
nuclear@5 257 rtarg[eye].vmin = vmin;
nuclear@5 258 rtarg[eye].vmax = vmax;
nuclear@0 259 }
nuclear@0 260 }
nuclear@0 261
nuclear@0 262 void vr_recenter(void)
nuclear@0 263 {
nuclear@0 264 if(vrm && vrm->recenter) {
nuclear@0 265 vrm->recenter();
nuclear@0 266 }
nuclear@0 267 }
nuclear@0 268
nuclear@5 269 static void fallback_present(void)
nuclear@5 270 {
nuclear@5 271 int i;
nuclear@0 272
nuclear@5 273 glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);
nuclear@0 274
nuclear@5 275 glDisable(GL_LIGHTING);
nuclear@5 276 glDisable(GL_DEPTH_TEST);
nuclear@5 277 glDisable(GL_ALPHA_TEST);
nuclear@5 278 glDisable(GL_STENCIL_TEST);
nuclear@5 279 glDisable(GL_FOG);
nuclear@5 280
nuclear@5 281 glEnable(GL_TEXTURE_2D);
nuclear@5 282
nuclear@5 283 glMatrixMode(GL_MODELVIEW);
nuclear@5 284 glPushMatrix();
nuclear@5 285 glLoadIdentity();
nuclear@5 286 glMatrixMode(GL_PROJECTION);
nuclear@5 287 glPushMatrix();
nuclear@5 288 glLoadIdentity();
nuclear@5 289
nuclear@5 290 for(i=0; i<2; i++) {
nuclear@5 291 float x0 = i == 0 ? -1 : 0;
nuclear@5 292 float x1 = i == 0 ? 0 : 1;
nuclear@5 293
nuclear@5 294 glBindTexture(GL_TEXTURE_2D, rtarg[i].tex);
nuclear@5 295
nuclear@5 296 glBegin(GL_QUADS);
nuclear@5 297 glTexCoord2f(rtarg[i].umin, rtarg[i].vmin);
nuclear@5 298 glVertex2f(x0, -1);
nuclear@5 299 glTexCoord2f(rtarg[i].umax, rtarg[i].vmin);
nuclear@5 300 glVertex2f(x1, -1);
nuclear@5 301 glTexCoord2f(rtarg[i].umax, rtarg[i].vmax);
nuclear@5 302 glVertex2f(x1, 1);
nuclear@5 303 glTexCoord2f(rtarg[i].umin, rtarg[i].vmax);
nuclear@5 304 glVertex2f(x0, 1);
nuclear@5 305 glEnd();
nuclear@5 306 }
nuclear@5 307
nuclear@5 308 glPopMatrix();
nuclear@5 309 glMatrixMode(GL_MODELVIEW);
nuclear@5 310 glPopMatrix();
nuclear@5 311
nuclear@5 312 glPopAttrib();
nuclear@0 313 }