libgoatvr

annotate src/vr.c @ 17:3de7339841d0

find changesets by author, revision, files, or words in the commit message
option for the null module fallback presentation to show one or both eye views
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 25 Sep 2014 17:14:04 +0300
parents b2d902fff68d
children 1067274dc780
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@7 2 #include <stdlib.h>
nuclear@0 3 #include <string.h>
nuclear@5 4 #include "opengl.h"
nuclear@0 5 #include "vr.h"
nuclear@0 6 #include "vr_impl.h"
nuclear@0 7 #include "mathutil.h"
nuclear@0 8
nuclear@0 9
nuclear@5 10 static void fallback_present(void);
nuclear@0 11
nuclear@0 12
nuclear@0 13 static struct vr_module *vrm;
nuclear@0 14 static float idmat[] = {
nuclear@0 15 1, 0, 0, 0,
nuclear@0 16 0, 1, 0, 0,
nuclear@0 17 0, 0, 1, 0,
nuclear@0 18 0, 0, 0, 1
nuclear@0 19 };
nuclear@0 20 static float fbtex_rect[] = {
nuclear@0 21 0, 0, 1, 1
nuclear@0 22 };
nuclear@0 23
nuclear@5 24 static void *defopt; /* default options db */
nuclear@5 25
nuclear@5 26 static struct {
nuclear@5 27 float umin, umax, vmin, vmax;
nuclear@5 28 int tex;
nuclear@5 29 } rtarg[2];
nuclear@5 30
nuclear@5 31
nuclear@0 32 int vr_init(void)
nuclear@0 33 {
nuclear@0 34 int i, nmodules;
nuclear@7 35 char *vrmod_env;
nuclear@0 36
nuclear@5 37 /* create the default options database */
nuclear@5 38 if(!defopt && (defopt = create_options())) {
nuclear@16 39 set_option_float(defopt, VR_RENDER_RES_SCALE, 1.0);
nuclear@11 40 set_option_float(defopt, VR_EYE_HEIGHT, 1.675);
nuclear@11 41 set_option_float(defopt, VR_IPD, 0.064);
nuclear@17 42 set_option_int(defopt, VR_NULL_STEREO, 0);
nuclear@5 43 }
nuclear@5 44
nuclear@0 45 if(vrm) {
nuclear@0 46 vr_shutdown();
nuclear@0 47 }
nuclear@0 48
nuclear@0 49 vr_init_modules();
nuclear@0 50
nuclear@0 51 nmodules = vr_get_num_modules();
nuclear@0 52 for(i=0; i<nmodules; i++) {
nuclear@0 53 struct vr_module *m = vr_get_module(i);
nuclear@0 54 if(m->init() != -1) {
nuclear@0 55 /* add to the active modules array */
nuclear@0 56 vr_activate_module(i);
nuclear@0 57 }
nuclear@0 58 }
nuclear@0 59
nuclear@7 60 if(!vr_get_num_active_modules()) {
nuclear@0 61 return -1;
nuclear@0 62 }
nuclear@7 63
nuclear@7 64 if((vrmod_env = getenv("VR_MODULE"))) {
nuclear@7 65 vr_use_module_named(vrmod_env);
nuclear@7 66 } else {
nuclear@7 67 vr_use_module(0);
nuclear@7 68 }
nuclear@0 69 return 0;
nuclear@0 70 }
nuclear@0 71
nuclear@0 72 void vr_shutdown(void)
nuclear@0 73 {
nuclear@0 74 vr_clear_modules();
nuclear@0 75 vrm = 0;
nuclear@0 76 fbtex_rect[0] = fbtex_rect[1] = 0;
nuclear@0 77 fbtex_rect[2] = fbtex_rect[3] = 1;
nuclear@0 78 }
nuclear@0 79
nuclear@0 80 int vr_module_count(void)
nuclear@0 81 {
nuclear@0 82 return vr_get_num_active_modules();
nuclear@0 83 }
nuclear@0 84
nuclear@0 85 const char *vr_module_name(int idx)
nuclear@0 86 {
nuclear@0 87 struct vr_module *m = vr_get_active_module(idx);
nuclear@0 88 if(!m) {
nuclear@0 89 return 0;
nuclear@0 90 }
nuclear@0 91 return m->name;
nuclear@0 92 }
nuclear@0 93
nuclear@0 94 int vr_use_module(int idx)
nuclear@0 95 {
nuclear@0 96 if(idx >= 0 && idx < vr_get_num_active_modules()) {
nuclear@0 97 struct vr_module *m = vr_get_active_module(idx);
nuclear@0 98 if(m != vrm) {
nuclear@0 99 vrm = m;
nuclear@0 100 printf("using vr module: %s\n", vrm->name);
nuclear@0 101 }
nuclear@0 102 return 0;
nuclear@0 103 }
nuclear@0 104 return -1;
nuclear@0 105 }
nuclear@0 106
nuclear@0 107 int vr_use_module_named(const char *name)
nuclear@0 108 {
nuclear@0 109 int i, count = vr_get_num_active_modules();
nuclear@0 110
nuclear@0 111 for(i=0; i<count; i++) {
nuclear@0 112 struct vr_module *m = vr_get_active_module(i);
nuclear@0 113 if(strcmp(m->name, name) == 0) {
nuclear@0 114 return vr_use_module(i);
nuclear@0 115 }
nuclear@0 116 }
nuclear@0 117 return -1;
nuclear@0 118 }
nuclear@0 119
nuclear@11 120 void vr_seti(const char *optname, int val)
nuclear@0 121 {
nuclear@0 122 if(vrm && vrm->set_option) {
nuclear@0 123 vrm->set_option(optname, OTYPE_INT, &val);
nuclear@5 124 } else {
nuclear@5 125 set_option_int(defopt, optname, val);
nuclear@0 126 }
nuclear@0 127 }
nuclear@0 128
nuclear@11 129 void vr_setf(const char *optname, float val)
nuclear@0 130 {
nuclear@0 131 if(vrm && vrm->set_option) {
nuclear@0 132 vrm->set_option(optname, OTYPE_FLOAT, &val);
nuclear@5 133 } else {
nuclear@5 134 set_option_float(defopt, optname, val);
nuclear@0 135 }
nuclear@0 136 }
nuclear@0 137
nuclear@16 138 static int def_option_int(const char *optname)
nuclear@16 139 {
nuclear@16 140 int res = 0;
nuclear@16 141 int left, right;
nuclear@16 142
nuclear@16 143 if(strcmp(optname, VR_RENDER_XRES) == 0) {
nuclear@16 144 if(vrm && vrm->get_option && vrm->get_option(optname, OTYPE_INT, &left) != -1 &&
nuclear@16 145 vrm->get_option(optname, OTYPE_INT, &right) != -1) {
nuclear@16 146 return left + right;
nuclear@16 147 }
nuclear@16 148 } else if(strcmp(optname, VR_RENDER_YRES) == 0) {
nuclear@16 149 if(vrm && vrm->get_option && vrm->get_option(optname, OTYPE_INT, &left) != -1 &&
nuclear@16 150 vrm->get_option(optname, OTYPE_INT, &right) != -1) {
nuclear@16 151 return left > right ? left : right;
nuclear@16 152 }
nuclear@16 153 }
nuclear@16 154
nuclear@16 155 get_option_int(defopt, optname, &res);
nuclear@16 156 return res;
nuclear@16 157 }
nuclear@16 158
nuclear@16 159 static float def_option_float(const char *optname)
nuclear@16 160 {
nuclear@16 161 int res = 0;
nuclear@16 162
nuclear@16 163 if(strcmp(optname, VR_RENDER_XRES) == 0 || strcmp(optname, VR_RENDER_YRES) == 0) {
nuclear@16 164 return (float)def_option_int(optname);
nuclear@16 165 }
nuclear@16 166
nuclear@16 167 get_option_float(defopt, optname, &res);
nuclear@16 168 return res;
nuclear@16 169 }
nuclear@16 170
nuclear@11 171 int vr_geti(const char *optname)
nuclear@0 172 {
nuclear@0 173 int res = 0;
nuclear@0 174
nuclear@5 175 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {
nuclear@16 176 res = def_option_int(optname);
nuclear@0 177 }
nuclear@0 178 return res;
nuclear@0 179 }
nuclear@0 180
nuclear@11 181 float vr_getf(const char *optname)
nuclear@0 182 {
nuclear@0 183 float res = 0.0f;
nuclear@0 184
nuclear@5 185 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {
nuclear@16 186 res = def_option_float(optname);
nuclear@0 187 }
nuclear@0 188 return res;
nuclear@0 189 }
nuclear@0 190
nuclear@12 191 int vr_geti_def(const char *optname, int def_val)
nuclear@12 192 {
nuclear@12 193 int res = 0;
nuclear@12 194
nuclear@12 195 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {
nuclear@12 196 if(get_option_int(defopt, optname, &res) == -1) { /* fallback */
nuclear@12 197 return def_val;
nuclear@12 198 }
nuclear@12 199 }
nuclear@12 200 return res;
nuclear@12 201 }
nuclear@12 202
nuclear@12 203 float vr_getf_def(const char *optname, float def_val)
nuclear@12 204 {
nuclear@12 205 float res = 0.0f;
nuclear@12 206
nuclear@12 207 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {
nuclear@12 208 if(get_option_float(defopt, optname, &res) == -1) { /* fallback */
nuclear@12 209 return def_val;
nuclear@12 210 }
nuclear@12 211 }
nuclear@12 212 return res;
nuclear@12 213 }
nuclear@0 214
nuclear@0 215 int vr_view_translation(int eye, float *vec)
nuclear@0 216 {
nuclear@0 217 if(vrm && vrm->translation) {
nuclear@0 218 vrm->translation(eye, vec);
nuclear@0 219 return 1;
nuclear@0 220 }
nuclear@0 221 vec[0] = vec[1] = vec[2] = 0.0f;
nuclear@0 222 return 0;
nuclear@0 223 }
nuclear@0 224
nuclear@0 225 int vr_view_rotation(int eye, float *quat)
nuclear@0 226 {
nuclear@0 227 if(vrm && vrm->rotation) {
nuclear@0 228 vrm->rotation(eye, quat);
nuclear@0 229 return 1;
nuclear@0 230 }
nuclear@0 231 quat[0] = quat[1] = quat[2] = 0.0f;
nuclear@0 232 quat[3] = 1.0f;
nuclear@0 233 return 0;
nuclear@0 234 }
nuclear@0 235
nuclear@0 236 int vr_view_matrix(int eye, float *mat)
nuclear@0 237 {
nuclear@0 238 int have_trans, have_rot;
nuclear@0 239 float offs[3], quat[4];
nuclear@0 240 float rmat[16], tmat[16];
nuclear@0 241
nuclear@0 242 if(vrm && vrm->view_matrix) {
nuclear@0 243 vrm->view_matrix(eye, mat);
nuclear@0 244 return 1;
nuclear@0 245 }
nuclear@0 246
nuclear@0 247 have_trans = vr_view_translation(eye, offs);
nuclear@0 248 have_rot = vr_view_rotation(eye, quat);
nuclear@0 249
nuclear@0 250 if(!have_trans && !have_rot) {
nuclear@5 251 memcpy(mat, idmat, sizeof idmat);
nuclear@0 252 return 0;
nuclear@0 253 }
nuclear@0 254
nuclear@0 255 offs[0] = -offs[0];
nuclear@0 256 offs[1] = -offs[1];
nuclear@0 257 offs[2] = -offs[2];
nuclear@0 258
nuclear@8 259 vrimp_translation_matrix(offs, tmat);
nuclear@8 260 vrimp_rotation_matrix(quat, rmat);
nuclear@8 261 vrimp_mult_matrix(mat, tmat, rmat);
nuclear@0 262 return 1;
nuclear@0 263 }
nuclear@0 264
nuclear@0 265 int vr_proj_matrix(int eye, float znear, float zfar, float *mat)
nuclear@0 266 {
nuclear@0 267 if(vrm && vrm->proj_matrix) {
nuclear@0 268 vrm->proj_matrix(eye, znear, zfar, mat);
nuclear@0 269 return 1;
nuclear@0 270 }
nuclear@0 271 memcpy(mat, idmat, sizeof idmat);
nuclear@0 272 return 0;
nuclear@0 273 }
nuclear@0 274
nuclear@0 275 void vr_begin(int eye)
nuclear@0 276 {
nuclear@0 277 if(vrm && vrm->begin) {
nuclear@0 278 vrm->begin(eye);
nuclear@0 279 }
nuclear@0 280 }
nuclear@0 281
nuclear@0 282 void vr_end(void)
nuclear@0 283 {
nuclear@0 284 if(vrm && vrm->end) {
nuclear@0 285 vrm->end();
nuclear@0 286 }
nuclear@0 287 }
nuclear@0 288
nuclear@0 289 int vr_swap_buffers(void)
nuclear@0 290 {
nuclear@0 291 int res = 0;
nuclear@0 292
nuclear@0 293 if(vrm && vrm->present) {
nuclear@0 294 res = vrm->present();
nuclear@0 295 }
nuclear@0 296
nuclear@0 297 if(!res) {
nuclear@5 298 fallback_present();
nuclear@8 299 vrimp_swap_buffers();
nuclear@0 300 }
nuclear@0 301 return 0;
nuclear@0 302 }
nuclear@0 303
nuclear@0 304 void vr_output_texture(unsigned int tex, float umin, float vmin, float umax, float vmax)
nuclear@0 305 {
nuclear@0 306 float halfu = (umax + umin) * 0.5f;
nuclear@0 307
nuclear@0 308 vr_output_texture_eye(VR_EYE_LEFT, tex, umin, vmin, halfu, vmax);
nuclear@0 309 vr_output_texture_eye(VR_EYE_RIGHT, tex, halfu, vmin, umax, vmax);
nuclear@0 310 }
nuclear@0 311
nuclear@0 312 void vr_output_texture_eye(int eye, unsigned int tex, float umin, float vmin, float umax, float vmax)
nuclear@0 313 {
nuclear@0 314 if(vrm && vrm->set_eye_texture) {
nuclear@0 315 vrm->set_eye_texture(eye, tex, umin, vmin, umax, vmax);
nuclear@5 316 } else {
nuclear@5 317 rtarg[eye].tex = tex;
nuclear@5 318 rtarg[eye].umin = umin;
nuclear@5 319 rtarg[eye].umax = umax;
nuclear@5 320 rtarg[eye].vmin = vmin;
nuclear@5 321 rtarg[eye].vmax = vmax;
nuclear@0 322 }
nuclear@0 323 }
nuclear@0 324
nuclear@0 325 void vr_recenter(void)
nuclear@0 326 {
nuclear@0 327 if(vrm && vrm->recenter) {
nuclear@0 328 vrm->recenter();
nuclear@0 329 }
nuclear@0 330 }
nuclear@0 331
nuclear@5 332 static void fallback_present(void)
nuclear@5 333 {
nuclear@17 334 int i, show_both = vr_geti(VR_NULL_STEREO);
nuclear@0 335
nuclear@5 336 glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);
nuclear@0 337
nuclear@5 338 glDisable(GL_LIGHTING);
nuclear@5 339 glDisable(GL_DEPTH_TEST);
nuclear@5 340 glDisable(GL_ALPHA_TEST);
nuclear@5 341 glDisable(GL_STENCIL_TEST);
nuclear@5 342 glDisable(GL_FOG);
nuclear@5 343
nuclear@5 344 glEnable(GL_TEXTURE_2D);
nuclear@5 345
nuclear@5 346 glMatrixMode(GL_MODELVIEW);
nuclear@5 347 glPushMatrix();
nuclear@5 348 glLoadIdentity();
nuclear@5 349 glMatrixMode(GL_PROJECTION);
nuclear@5 350 glPushMatrix();
nuclear@5 351 glLoadIdentity();
nuclear@5 352
nuclear@5 353 for(i=0; i<2; i++) {
nuclear@17 354 float x0, x1;
nuclear@17 355
nuclear@17 356 if(show_both) {
nuclear@17 357 x0 = i == 0 ? -1 : 0;
nuclear@17 358 x1 = i == 0 ? 0 : 1;
nuclear@17 359 } else {
nuclear@17 360 x0 = -1;
nuclear@17 361 x1 = 1;
nuclear@17 362 }
nuclear@5 363
nuclear@5 364 glBindTexture(GL_TEXTURE_2D, rtarg[i].tex);
nuclear@5 365
nuclear@5 366 glBegin(GL_QUADS);
nuclear@5 367 glTexCoord2f(rtarg[i].umin, rtarg[i].vmin);
nuclear@5 368 glVertex2f(x0, -1);
nuclear@5 369 glTexCoord2f(rtarg[i].umax, rtarg[i].vmin);
nuclear@5 370 glVertex2f(x1, -1);
nuclear@5 371 glTexCoord2f(rtarg[i].umax, rtarg[i].vmax);
nuclear@5 372 glVertex2f(x1, 1);
nuclear@5 373 glTexCoord2f(rtarg[i].umin, rtarg[i].vmax);
nuclear@5 374 glVertex2f(x0, 1);
nuclear@5 375 glEnd();
nuclear@17 376
nuclear@17 377 if(!show_both) break;
nuclear@5 378 }
nuclear@5 379
nuclear@5 380 glPopMatrix();
nuclear@5 381 glMatrixMode(GL_MODELVIEW);
nuclear@5 382 glPopMatrix();
nuclear@5 383
nuclear@5 384 glPopAttrib();
nuclear@0 385 }