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