git.mutantstargoat.com Git - laserbrain_demo/blob - src/main.cc

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <assert.h>
   4 #include <GL/glew.h>
   5 #include <SDL2/SDL.h>
   6 #include "app.h"
   7
   8 static bool init(int argc, char **argv);
   9 static void process_event(SDL_Event *ev);
  10 static void proc_modkeys();
  11
  12 static SDL_Window *win;
  13 static SDL_GLContext ctx;
  14 static bool fullscreen, mouse_grabbed;
  15 static bool quit;
  16
  17 static unsigned int start_time;
  18 static unsigned int modkeys;
  19
  20 SDL_GameController *gamepad;
  21
  22 static int scale_factor = 1;
  23
  24 int main(int argc, char **argv)
  25 {
  26         if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0) {
  27                 fprintf(stderr, "failed to initialize SDL\n");
  28                 return 1;
  29         }
  30
  31         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
  32         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 8);
  33         SDL_GL_SetAttribute(SDL_GL_FRAMEBUFFER_SRGB_CAPABLE, 1);
  34
  35         int defpos = SDL_WINDOWPOS_UNDEFINED;
  36         unsigned int sdlflags = SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI;
  37
  38         if(!(win = SDL_CreateWindow("demo", defpos, defpos, 1024, 768, sdlflags))) {
  39                 // try again without sRGB capability
  40                 SDL_GL_SetAttribute(SDL_GL_FRAMEBUFFER_SRGB_CAPABLE, 0);
  41                 if(!(win = SDL_CreateWindow("demo", defpos, defpos, 1024, 768, sdlflags))) {
  42                         fprintf(stderr, "failed to create window\n");
  43                         SDL_Quit();
  44                         return 1;
  45                 }
  46                 fprintf(stderr, "failed to get an sRGB framebuffer.\n");
  47         }
  48         int val;
  49         SDL_GL_GetAttribute(SDL_GL_FRAMEBUFFER_SRGB_CAPABLE, &val);
  50         printf("SDL says we %s an sRGB framebuffer\n", val ? "got" : "didn't get");
  51
  52         if(!(ctx = SDL_GL_CreateContext(win))) {
  53                 fprintf(stderr, "failed to create OpenGL context\n");
  54                 SDL_Quit();
  55                 return 1;
  56         }
  57         SDL_GL_GetDrawableSize(win, &win_width, &win_height);
  58         win_aspect = (float)win_width / (float)win_height;
  59
  60         printf("detected %d joysticks\n", SDL_NumJoysticks());
  61         for(int i=0; i<SDL_NumJoysticks(); i++) {
  62                 if(SDL_IsGameController(i)) {
  63                         if(!(gamepad = SDL_GameControllerOpen(i))) {
  64                                 fprintf(stderr, "failed to open game controller %i: %s\n", i, SDL_GetError());
  65                                 continue;
  66                         }
  67                         printf("Using gamepad: %s\n", SDL_GameControllerNameForIndex(i));
  68                 }
  69         }
  70
  71         if(!init(argc, argv)) {
  72                 SDL_Quit();
  73                 return 1;
  74         }
  75         app_reshape(win_width, win_height);
  76
  77         while(!quit) {
  78                 SDL_Event ev;
  79
  80                 time_msec = SDL_GetTicks() - start_time;
  81                 while(SDL_PollEvent(&ev)) {
  82                         process_event(&ev);
  83                         if(quit) goto break_evloop;
  84                 }
  85
  86                 app_display();
  87         }
  88 break_evloop:
  89
  90         app_cleanup();
  91         SDL_Quit();
  92         return 0;
  93 }
  94
  95 void app_swap_buffers()
  96 {
  97         SDL_GL_SwapWindow(win);
  98 }
  99
 100 void app_quit()
 101 {
 102         quit = true;
 103 }
 104
 105 unsigned int app_get_modifiers()
 106 {
 107         return modkeys;
 108 }
 109
 110 void app_resize(int x, int y)
 111 {
 112         SDL_SetWindowSize(win, x, y);
 113 }
 114
 115 void app_fullscreen(bool fs)
 116 {
 117         SDL_SetWindowFullscreen(win, fs ? SDL_WINDOW_FULLSCREEN_DESKTOP : 0);
 118         fullscreen = fs;
 119 }
 120
 121 void app_toggle_fullscreen()
 122 {
 123         app_fullscreen(!fullscreen);
 124 }
 125
 126 bool app_is_fullscreen()
 127 {
 128         return fullscreen;
 129 }
 130
 131 void app_grab_mouse(bool grab)
 132 {
 133         if(grab) {
 134                 SDL_WarpMouseInWindow(win, win_width / 2, win_height / 2);
 135         }
 136         //SDL_SetWindowGrab(win, grab ? SDL_TRUE : SDL_FALSE);
 137         //SDL_ShowCursor(grab ? 1 : 0);
 138         SDL_SetRelativeMouseMode(grab ? SDL_TRUE : SDL_FALSE);
 139         mouse_grabbed = grab;
 140 }
 141
 142 void app_toggle_grab_mouse()
 143 {
 144         app_grab_mouse(!mouse_grabbed);
 145 }
 146
 147 bool app_is_mouse_grabbed()
 148 {
 149         return mouse_grabbed;
 150 }
 151
 152
 153 static bool init(int argc, char **argv)
 154 {
 155         glewInit();
 156
 157         if(!app_init(argc, argv)) {
 158                 return false;
 159         }
 160
 161         start_time = SDL_GetTicks();
 162         return true;
 163 }
 164
 165 static void process_event(SDL_Event *ev)
 166 {
 167         switch(ev->type) {
 168         case SDL_QUIT:
 169                 quit = true;
 170                 break;
 171
 172         case SDL_KEYDOWN:
 173         case SDL_KEYUP:
 174                 proc_modkeys();
 175                 app_keyboard(ev->key.keysym.sym, ev->key.state == SDL_PRESSED);
 176                 break;
 177
 178         case SDL_MOUSEBUTTONDOWN:
 179         case SDL_MOUSEBUTTONUP:
 180                 proc_modkeys();
 181                 app_mouse_button(ev->button.button - SDL_BUTTON_LEFT, ev->button.state == SDL_PRESSED,
 182                                 ev->button.x * scale_factor, ev->button.y * scale_factor);
 183                 break;
 184
 185         case SDL_MOUSEMOTION:
 186                 if(mouse_grabbed) {
 187                         app_mouse_delta(ev->motion.xrel, ev->motion.yrel);
 188                 } else {
 189                         app_mouse_motion(ev->motion.x * scale_factor, ev->motion.y * scale_factor);
 190                 }
 191                 break;
 192
 193         case SDL_WINDOWEVENT:
 194                 if(ev->window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
 195                         SDL_GL_GetDrawableSize(win, &win_width, &win_height);
 196                         win_aspect = (float)win_width / (float)win_height;
 197                         scale_factor = win_width / ev->window.data1;
 198                         app_reshape(win_width, win_height);
 199                 }
 200                 break;
 201
 202         case SDL_CONTROLLERAXISMOTION:
 203                 app_gamepad_axis(ev->caxis.axis, ev->caxis.value / 32768.0f);
 204                 break;
 205
 206         case SDL_CONTROLLERBUTTONDOWN:
 207         case SDL_CONTROLLERBUTTONUP:
 208                 app_gamepad_button(ev->cbutton.button, ev->type == SDL_CONTROLLERBUTTONDOWN);
 209                 break;
 210         }
 211 }
 212
 213 static void proc_modkeys()
 214 {
 215         modkeys = 0;
 216         SDL_Keymod sdlmod = SDL_GetModState();
 217         if(sdlmod & KMOD_SHIFT) {
 218                 modkeys |= MOD_SHIFT;
 219         }
 220         if(sdlmod & KMOD_ALT) {
 221                 modkeys |= MOD_ALT;
 222         }
 223         if(sdlmod & KMOD_CTRL) {
 224                 modkeys |= MOD_CTRL;
 225         }
 226 }