vg/vg.h

   1 // Copyright (C) 2021 Harry Godden (hgn) - All Rights Reserved
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <dirent.h>
   6 #include <stdint.h>
   7 #include <string.h>
   8 #include <stdarg.h>
   9
  10 #include "gl/glad/glad.h"
  11 #include "gl/glfw3.h"
  12
  13 #define STB_DS_IMPLEMENTATION
  14 #include "stb/stb_ds.h"
  15
  16 #include "cglm/include/cglm/cglm.h"
  17
  18 void vg_register_exit( void( *funcptr )(void), const char *name );
  19 void vg_exiterr( const char *strErr );
  20
  21 #include "vg/vg_platform.h"
  22 #include "vg/vg_io.h"
  23 #include "vg/vg_audio.h"
  24 #include "vg/vg_shader.h"
  25
  26 #include "steam/steamworks_thin.h"
  27
  28 static inline float vg_get_axis( const char *axis ) __attribute__((unused));
  29 static inline int vg_get_button( const char *button ) __attribute__((unused));
  30 static inline int vg_get_button_down( const char *button ) __attribute__((unused));
  31 static inline int vg_get_button_up( const char *button ) __attribute__((unused));
  32
  33 // Globals
  34 GLFWwindow* vg_window;
  35 int vg_window_x = 1280;
  36 int vg_window_y = 720;
  37
  38 float vg_mouse_x;
  39 float vg_mouse_y;
  40
  41 float   vg_time;
  42 float   vg_time_last;
  43 float   vg_time_delta;
  44
  45 // Input
  46 // ===========================================================================================================
  47 GLFWgamepadstate vg_gamepad;
  48 int                     vg_gamepad_ready = 0;
  49 const char *vg_gamepad_name = NULL;
  50 int                     vg_gamepad_id;
  51
  52 enum EInputMode
  53 {
  54         k_EInputMode_pc,
  55         k_EInputMode_gamepad
  56 }
  57 vg_input_mode;
  58
  59 static struct axis_binding
  60 {
  61         const char *name;
  62         union
  63         {
  64                 int positive;
  65                 int bind;
  66         };
  67         int negative;
  68
  69         float value;
  70 }
  71 vg_axis_binds[];
  72
  73 static struct button_binding
  74 {
  75         const char *name;
  76         int bind;
  77
  78         int value; int prev;
  79 }
  80 vg_button_binds[];
  81
  82 #include "vg/config.h"
  83
  84 #pragma GCC diagnostic push
  85 #pragma GCC diagnostic ignored "-Wreturn-type"
  86
  87 static inline float vg_get_axis( const char *axis )
  88 {
  89         for( int i = 0; i < vg_list_size( vg_axis_binds ); i ++ )
  90         {
  91                 if( !strcmp( axis, vg_axis_binds[i].name ) )
  92                 {
  93                         return vg_axis_binds[i].value;
  94                 }
  95         }
  96 }
  97
  98 static inline struct button_binding *vg_get_button_ptr( const char *button )
  99 {
 100         for( int i = 0; i < vg_list_size( vg_button_binds ); i ++ )
 101         {
 102                 if( !strcmp( button, vg_button_binds[i].name ) )
 103                 {
 104                         return vg_button_binds + i;
 105                 }
 106         }
 107 }
 108 #pragma GCC diagnostic pop
 109
 110 static inline int vg_get_button( const char *button )
 111 {
 112         return vg_get_button_ptr( button )->value;
 113 }
 114
 115 static inline int vg_get_button_down( const char *button )
 116 {
 117         struct button_binding *bind = vg_get_button_ptr( button );
 118         return bind->value & (bind->value ^ bind->prev);
 119 }
 120
 121 static inline int vg_get_button_up( const char *button )
 122 {
 123         struct button_binding *bind = vg_get_button_ptr( button );
 124         return bind->prev & (bind->value ^ bind->prev);
 125 }
 126
 127 static inline int key_is_keyboard( int const id )
 128 {
 129         static_assert( GLFW_MOUSE_BUTTON_LAST < GLFW_KEY_SPACE, "GLFW: Mouse has too many buttons" );
 130         return id > GLFW_MOUSE_BUTTON_LAST;
 131 }
 132
 133 // Mouse AND Keyboard get button press
 134 int get_button_cross_device( int const id )
 135 {
 136         if( key_is_keyboard( id ) )
 137         {
 138                 return glfwGetKey( vg_window, id );
 139         }
 140         else
 141         {
 142                 return glfwGetMouseButton( vg_window, id ) == GLFW_PRESS;
 143         }
 144 }
 145
 146 void vg_update_inputs(void)
 147 {
 148         // Update button inputs
 149         for( int i = 0; i < vg_list_size( vg_button_binds ); i ++ )
 150         {
 151                 struct button_binding *binding = vg_button_binds + i;
 152                 binding->prev = binding->value;
 153
 154                 if( vg_input_mode == k_EInputMode_pc )
 155                 {
 156                         binding->value = get_button_cross_device( binding->bind );
 157                 }
 158                 else
 159                 {
 160                         binding->value = vg_gamepad.buttons[ binding->bind ];
 161                 }
 162         }
 163
 164         // Update axis inputs
 165         for( int i = 0; i < vg_list_size( vg_axis_binds ); i ++ )
 166         {
 167                 struct axis_binding *binding = vg_axis_binds + i;
 168
 169                 if( vg_input_mode == k_EInputMode_pc )
 170                 {
 171                         binding->value  = get_button_cross_device( binding->positive );
 172                         binding->value -= get_button_cross_device( binding->negative );
 173                 }
 174                 else
 175                 {
 176                         binding->value = vg_gamepad.axes[ binding->bind ];
 177                 }
 178         }
 179 }
 180
 181 // Engine main
 182 // ===========================================================================================================
 183
 184 #ifndef VG_RELEASE
 185 void vg_checkgl( const char *src_info )
 186 {
 187         GLenum err;
 188         while( (err = glGetError()) != GL_NO_ERROR )
 189         {
 190                 vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
 191         }
 192 }
 193
 194  #define VG_STRINGIT( X ) #X
 195  #define VG_CHECK_GL() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
 196 #else
 197  #define VG_CHECK_GL()
 198 #endif
 199
 200
 201 #define VG_GAMELOOP
 202
 203 void( *vg_on_exit[16] )(void);
 204 u32 vg_exit_count = 0;
 205
 206 // Add a shutdown step
 207 void vg_register_exit( void( *funcptr )(void), const char *name )
 208 {
 209         vg_info( "exit registered: (%u)'%s'\n", vg_exit_count, name );
 210         vg_on_exit[ vg_exit_count ++ ] = funcptr;
 211 }
 212
 213 void vg_exit(void)
 214 {
 215         for( int i = vg_exit_count-1; i >= 0; i -- )
 216         {
 217                 vg_info( "engine_exit[%d]()\n", i );
 218                 vg_on_exit[i]();
 219         }
 220
 221         vg_info( "done\n" );
 222 }
 223
 224 // Forcefully exit program after error
 225 void vg_exiterr( const char *strErr )
 226 {
 227         vg_error( "Engine Fatal: %s\n", strErr );
 228         vg_exit();
 229         exit(0);
 230 }
 231
 232 // Callbacks
 233 // ---------
 234
 235 void vg_mouse_callback( GLFWwindow* ptrW, double xpos, double ypos )
 236 {
 237         vg_mouse_x = xpos;
 238         vg_mouse_y = ypos;
 239 }
 240
 241 void vg_scroll_callback( GLFWwindow* ptrW, double xoffset, double yoffset )
 242 {
 243
 244 }
 245
 246 void vg_framebuffer_resize_callback( GLFWwindow *ptrW, int w, int h )
 247 {
 248         vg_window_x = w;
 249         vg_window_y = h;
 250 }
 251
 252 static void vg_start(void) VG_GAMELOOP;
 253 static void vg_update(void) VG_GAMELOOP;
 254 static void vg_render(void) VG_GAMELOOP;
 255 static void vg_ui(void) VG_GAMELOOP;
 256 static void vg_free(void) VG_GAMELOOP;
 257
 258 static void vg_init( int argc, char *argv[], const char *window_name )
 259 {
 260 #ifdef VG_STEAM
 261         // Initialize steamworks
 262         if( !sw_init( 1218140U ) )
 263         {
 264                 vg_exiterr( "Steamworks failed to initialize" );
 265         }
 266         else
 267         {
 268                 vg_register_exit( &sw_SteamAPI_Shutdown, "SteamAPI" );
 269         }
 270 #endif
 271
 272         // Context creation
 273         // ==========================================================================================================================
 274         glfwInit();
 275         glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );
 276         glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );
 277         glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
 278         glfwWindowHint( GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE );
 279
 280         glfwWindowHint( GLFW_SAMPLES, 4 );
 281
 282         GLFWmonitor *monitor_primary = glfwGetPrimaryMonitor();
 283
 284         const GLFWvidmode *mode = glfwGetVideoMode( monitor_primary );
 285         glfwWindowHint( GLFW_RED_BITS, mode->redBits );
 286         glfwWindowHint( GLFW_GREEN_BITS, mode->greenBits );
 287         glfwWindowHint( GLFW_BLUE_BITS, mode->blueBits );
 288         glfwWindowHint( GLFW_REFRESH_RATE, mode->refreshRate );
 289
 290         if( !(vg_window = glfwCreateWindow( vg_window_x, vg_window_y, window_name, NULL, NULL)) )
 291         {
 292                 vg_exiterr( "GLFW Failed to initialize" );
 293         }
 294         else
 295         {
 296                 vg_register_exit( &glfwTerminate, "glfwTerminate" );
 297         }
 298
 299         glfwMakeContextCurrent( vg_window );
 300         glfwSwapInterval( 1 );
 301
 302         // Set callbacks
 303         glfwSetFramebufferSizeCallback( vg_window, vg_framebuffer_resize_callback );
 304
 305         glfwSetCursorPosCallback( vg_window, vg_mouse_callback );
 306         glfwSetScrollCallback( vg_window, vg_scroll_callback );
 307
 308         //glfwSetCharCallback( vg_window, console_proc_wchar );
 309         //glfwSetKeyCallback( vg_window, console_proc_key );
 310         //glfwSetInputMode(vg_window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
 311
 312         if( !gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) )
 313         {
 314                 vg_exiterr( "Glad failed to initialize" );
 315         }
 316
 317         const unsigned char* glver = glGetString( GL_VERSION );
 318         vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 319
 320         for( int id = 0; id <= GLFW_JOYSTICK_LAST; id ++ )
 321         {
 322                 if( glfwJoystickIsGamepad( id ) )
 323                 {
 324                         vg_gamepad_name = glfwGetGamepadName( id );
 325                         vg_success( "Gamepad with mapping registered: %s\n", vg_gamepad_name );
 326
 327                         vg_gamepad_ready = 1;
 328                         vg_gamepad_id = id;
 329
 330                         return;
 331                 }
 332         }
 333
 334         vg_audio_init();
 335         vg_register_exit( &vg_audio_free, "vg_audio_free" );
 336
 337         vg_start();
 338         if( vg_shaders_compile() )
 339         {
 340                 // Main gameloop
 341                 while( !glfwWindowShouldClose( vg_window ) )
 342                 {
 343                         glfwPollEvents();
 344
 345                         #ifdef VG_STEAM
 346                         sw_RunSteamEventLoop();
 347                         #endif
 348
 349                         vg_time_last = vg_time;
 350                         vg_time = glfwGetTime();
 351                         vg_time_delta = vg_min( vg_time - vg_time_last, 0.1f );
 352
 353                         vg_update_inputs();
 354
 355                         vg_update();
 356
 357                         // Update mashed projections etc
 358
 359                         vg_render();
 360                         vg_ui();
 361
 362                         glfwSwapBuffers( vg_window );
 363
 364                         VG_CHECK_GL();
 365                 }
 366         }
 367
 368         vg_free();
 369         vg_exit();
 370 }
 371
 372 u32 NvOptimusEnablement = 0x00000001;
 373 int AmdPowerXpressRequestHighPerformance = 1;