git.mutantstargoat.com Git - vrtris/blob - src/game.c

   1 #include <assert.h>
   2 #ifdef BUILD_VR
   3 #include <goatvr.h>
   4 #endif
   5 #include <cgmath/cgmath.h>
   6 #include "opengl.h"
   7 #include "game.h"
   8 #include "screen.h"
   9 #include "osd.h"
  10 #include "opt.h"
  11
  12 #define DEFSCR  "game"
  13
  14 static void calc_framerate(void);
  15 static void print_framerate(void);
  16
  17 #ifdef BUILD_VR
  18 static int should_swap;
  19 #endif
  20 static unsigned long framerate;
  21
  22
  23 int game_init(int argc, char **argv)
  24 {
  25         if(init_opengl() == -1) {
  26                 return -1;
  27         }
  28
  29         if(init_options(argc, argv, "vrtris.conf") == -1) {
  30                 return -1;
  31         }
  32
  33         if(init_screens() == -1) {
  34                 return -1;
  35         }
  36
  37 #ifdef BUILD_VR
  38         if(opt.flags & OPT_VR) {
  39                 if(goatvr_init() == -1) {
  40                         return -1;
  41                 }
  42                 goatvr_set_origin_mode(GOATVR_HEAD);
  43                 goatvr_set_units_scale(10.0f);
  44
  45                 goatvr_startvr();
  46                 should_swap = goatvr_should_swap();
  47         }
  48 #endif  /* BUILD_VR */
  49
  50         glEnable(GL_DEPTH_TEST);
  51         glEnable(GL_CULL_FACE);
  52         glEnable(GL_LIGHTING);
  53         glEnable(GL_LIGHT0);
  54
  55         return 0;
  56 }
  57
  58 void game_cleanup()
  59 {
  60 #ifdef BUILD_VR
  61         if(opt.flags & OPT_VR) {
  62                 goatvr_shutdown();
  63         }
  64 #endif
  65         cleanup_screens();
  66 }
  67
  68 static void update(float dt)
  69 {
  70         screen->update(dt);
  71 }
  72
  73 void game_display(void)
  74 {
  75         static long prev_msec;
  76         float dt = (float)(time_msec - prev_msec) / 1000.0f;
  77         prev_msec = time_msec;
  78
  79         update(dt);
  80
  81 #ifdef BUILD_VR
  82         if(opt.flags & OPT_VR) {
  83                 int i;
  84                 goatvr_draw_start();
  85                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  86
  87                 for(i=0; i<2; i++) {
  88                         /* for each eye */
  89                         goatvr_draw_eye(i);
  90
  91                         cgm_mcopy(proj_matrix, goatvr_projection_matrix(i, 0.5, 500.0));
  92                         glMatrixMode(GL_PROJECTION);
  93                         glLoadMatrixf(proj_matrix);
  94
  95                         cgm_mcopy(view_matrix, goatvr_view_matrix(i));
  96                         glMatrixMode(GL_MODELVIEW);
  97                         glLoadMatrixf(view_matrix);
  98
  99                         screen->draw();
 100                         print_framerate();
 101                         draw_osd();
 102                 }
 103
 104                 goatvr_draw_done();
 105
 106                 if(should_swap) {
 107                         game_swap_buffers();
 108                 }
 109
 110         } else
 111 #endif  /* BUILD_VR */
 112         {
 113                 /* non-VR mode */
 114                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 115
 116                 cgm_mperspective(proj_matrix, cgm_deg_to_rad(40.0), win_aspect, 0.5, 500.0);
 117                 glMatrixMode(GL_PROJECTION);
 118                 glLoadMatrixf(proj_matrix);
 119
 120                 cgm_midentity(view_matrix);
 121                 glMatrixMode(GL_MODELVIEW);
 122                 glLoadMatrixf(view_matrix);
 123
 124                 screen->draw();
 125                 print_framerate();
 126                 draw_osd();
 127
 128                 game_swap_buffers();
 129         }
 130
 131         assert(glGetError() == GL_NO_ERROR);
 132
 133         calc_framerate();
 134 }
 135
 136 void game_reshape(int x, int y)
 137 {
 138         glViewport(0, 0, x, y);
 139 #ifdef BUILD_VR
 140         goatvr_set_fb_size(x, y, 1.0f);
 141 #endif
 142
 143         reshape_screens(x, y);
 144 }
 145
 146 void game_keyboard(int key, int pressed)
 147 {
 148         unsigned int mod = game_get_modifiers();
 149
 150         if(pressed) {
 151                 switch(key) {
 152                 case 27:
 153                         game_quit();
 154                         return;
 155
 156                 case '\n':
 157                 case '\r':
 158                         if(mod & MOD_ALT) {
 159                                 game_toggle_fullscreen();
 160                                 return;
 161                         }
 162                         break;
 163
 164                 case KEY_HOME:
 165 #ifdef BUILD_VR
 166                         if(opt.flags & OPT_VR) {
 167                                 goatvr_recenter();
 168                         }
 169 #endif
 170                         break;
 171
 172                 default:
 173                         break;
 174                 }
 175         }
 176
 177         screen->keyboard(key, pressed);
 178 }
 179
 180 void game_mouse_button(int bn, int pressed, int x, int y)
 181 {
 182         screen->mouse(bn, pressed, x, y);
 183 }
 184
 185 void game_mouse_motion(int x, int y)
 186 {
 187         screen->motion(x, y);
 188 }
 189
 190 void game_mouse_wheel(int dir)
 191 {
 192         screen->wheel(dir);
 193 }
 194
 195
 196 void game_gamepad_axis(int axis, float val)
 197 {
 198         joy_axis[axis] = val;
 199 }
 200
 201 void game_gamepad_button(int bn, int pressed)
 202 {
 203         if(pressed) {
 204                 joy_bnstate |= (1 << bn);
 205         } else {
 206                 joy_bnstate &= ~(1 << bn);
 207         }
 208 }
 209
 210 static void calc_framerate(void)
 211 {
 212         static unsigned long nframes;
 213         static long prev_upd;
 214
 215         long elapsed = time_msec - prev_upd;
 216         if(elapsed >= 1000) {
 217                 framerate = nframes * 10000 / elapsed;
 218                 nframes = 1;
 219                 prev_upd = time_msec;
 220         } else {
 221                 ++nframes;
 222         }
 223 }
 224
 225 static void print_framerate(void)
 226 {
 227         print_text(9 * win_width / 10, 20, 1, 1, 0, "fps: %d.%d", framerate / 10, framerate % 10);
 228 }