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 mat4 vg_pv;
  22
  23 #include "vg/vg_platform.h"
  24 #include "vg/vg_io.h"
  25 #include "vg/vg_audio.h"
  26 #include "vg/vg_shader.h"
  27 #include "vg/vg_lines.h"
  28
  29 #include "steam/steamworks_thin.h"
  30
  31 static inline float vg_get_axis( const char *axis ) __attribute__((unused));
  32 static inline int vg_get_button( const char *button ) __attribute__((unused));
  33 static inline int vg_get_button_down( const char *button ) __attribute__((unused));
  34 static inline int vg_get_button_up( const char *button ) __attribute__((unused));
  35
  36 // Globals
  37 GLFWwindow* vg_window;
  38 int vg_window_x = 1280;
  39 int vg_window_y = 720;
  40
  41 float vg_mouse_x;
  42 float vg_mouse_y;
  43
  44 float   vg_time;
  45 float   vg_time_last;
  46 float   vg_time_delta;
  47
  48 // Input
  49 // ===========================================================================================================
  50 GLFWgamepadstate vg_gamepad;
  51 int                     vg_gamepad_ready = 0;
  52 const char *vg_gamepad_name = NULL;
  53 int                     vg_gamepad_id;
  54
  55 enum EInputMode
  56 {
  57         k_EInputMode_pc,
  58         k_EInputMode_gamepad
  59 }
  60 vg_input_mode;
  61
  62 static struct axis_binding
  63 {
  64         const char *name;
  65         union
  66         {
  67                 int positive;
  68                 int bind;
  69         };
  70         int negative;
  71
  72         float value;
  73 }
  74 vg_axis_binds[];
  75
  76 static struct button_binding
  77 {
  78         const char *name;
  79         int bind;
  80
  81         int value; int prev;
  82 }
  83 vg_button_binds[];
  84
  85 #include "vg/config.h"
  86
  87 #pragma GCC diagnostic push
  88 #pragma GCC diagnostic ignored "-Wreturn-type"
  89
  90 static inline float vg_get_axis( const char *axis )
  91 {
  92         for( int i = 0; i < vg_list_size( vg_axis_binds ); i ++ )
  93         {
  94                 if( !strcmp( axis, vg_axis_binds[i].name ) )
  95                 {
  96                         return vg_axis_binds[i].value;
  97                 }
  98         }
  99 }
 100
 101 static inline struct button_binding *vg_get_button_ptr( const char *button )
 102 {
 103         for( int i = 0; i < vg_list_size( vg_button_binds ); i ++ )
 104         {
 105                 if( !strcmp( button, vg_button_binds[i].name ) )
 106                 {
 107                         return vg_button_binds + i;
 108                 }
 109         }
 110 }
 111 #pragma GCC diagnostic pop
 112
 113 static inline int vg_get_button( const char *button )
 114 {
 115         return vg_get_button_ptr( button )->value;
 116 }
 117
 118 static inline int vg_get_button_down( const char *button )
 119 {
 120         struct button_binding *bind = vg_get_button_ptr( button );
 121         return bind->value & (bind->value ^ bind->prev);
 122 }
 123
 124 static inline int vg_get_button_up( const char *button )
 125 {
 126         struct button_binding *bind = vg_get_button_ptr( button );
 127         return bind->prev & (bind->value ^ bind->prev);
 128 }
 129
 130 static inline int key_is_keyboard( int const id )
 131 {
 132         static_assert( GLFW_MOUSE_BUTTON_LAST < GLFW_KEY_SPACE, "GLFW: Mouse has too many buttons" );
 133         return id > GLFW_MOUSE_BUTTON_LAST;
 134 }
 135
 136 // Mouse AND Keyboard get button press
 137 int get_button_cross_device( int const id )
 138 {
 139         if( key_is_keyboard( id ) )
 140         {
 141                 return glfwGetKey( vg_window, id );
 142         }
 143         else
 144         {
 145                 return glfwGetMouseButton( vg_window, id ) == GLFW_PRESS;
 146         }
 147 }
 148
 149 void vg_update_inputs(void)
 150 {
 151         // Update button inputs
 152         for( int i = 0; i < vg_list_size( vg_button_binds ); i ++ )
 153         {
 154                 struct button_binding *binding = vg_button_binds + i;
 155                 binding->prev = binding->value;
 156
 157                 if( vg_input_mode == k_EInputMode_pc )
 158                 {
 159                         binding->value = get_button_cross_device( binding->bind );
 160                 }
 161                 else
 162                 {
 163                         binding->value = vg_gamepad.buttons[ binding->bind ];
 164                 }
 165         }
 166
 167         // Update axis inputs
 168         for( int i = 0; i < vg_list_size( vg_axis_binds ); i ++ )
 169         {
 170                 struct axis_binding *binding = vg_axis_binds + i;
 171
 172                 if( vg_input_mode == k_EInputMode_pc )
 173                 {
 174                         binding->value  = get_button_cross_device( binding->positive );
 175                         binding->value -= get_button_cross_device( binding->negative );
 176                 }
 177                 else
 178                 {
 179                         binding->value = vg_gamepad.axes[ binding->bind ];
 180                 }
 181         }
 182 }
 183
 184 // Engine main
 185 // ===========================================================================================================
 186
 187 #ifndef VG_RELEASE
 188 void vg_checkgl( const char *src_info )
 189 {
 190         GLenum err;
 191         while( (err = glGetError()) != GL_NO_ERROR )
 192         {
 193                 vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
 194         }
 195 }
 196
 197  #define VG_STRINGIT( X ) #X
 198  #define VG_CHECK_GL() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
 199 #else
 200  #define VG_CHECK_GL()
 201 #endif
 202
 203
 204 #define VG_GAMELOOP
 205
 206 void( *vg_on_exit[16] )(void);
 207 u32 vg_exit_count = 0;
 208
 209 // Add a shutdown step
 210 void vg_register_exit( void( *funcptr )(void), const char *name )
 211 {
 212         vg_info( "exit registered: (%u)'%s'\n", vg_exit_count, name );
 213         vg_on_exit[ vg_exit_count ++ ] = funcptr;
 214 }
 215
 216 void vg_exit(void)
 217 {
 218         for( int i = vg_exit_count-1; i >= 0; i -- )
 219         {
 220                 vg_info( "engine_exit[%d]()\n", i );
 221                 vg_on_exit[i]();
 222         }
 223
 224         vg_info( "done\n" );
 225 }
 226
 227 // Forcefully exit program after error
 228 void vg_exiterr( const char *strErr )
 229 {
 230         vg_error( "Engine Fatal: %s\n", strErr );
 231         vg_exit();
 232         exit(0);
 233 }
 234
 235 // Callbacks
 236 // ---------
 237
 238 void vg_mouse_callback( GLFWwindow* ptrW, double xpos, double ypos )
 239 {
 240         vg_mouse_x = xpos;
 241         vg_mouse_y = ypos;
 242 }
 243
 244 void vg_scroll_callback( GLFWwindow* ptrW, double xoffset, double yoffset )
 245 {
 246
 247 }
 248
 249 void vg_framebuffer_resize_callback( GLFWwindow *ptrW, int w, int h )
 250 {
 251         vg_window_x = w;
 252         vg_window_y = h;
 253 }
 254
 255 static void vg_start(void) VG_GAMELOOP;
 256 static void vg_update(void) VG_GAMELOOP;
 257 static void vg_render(void) VG_GAMELOOP;
 258 static void vg_ui(void) VG_GAMELOOP;
 259 static void vg_free(void) VG_GAMELOOP;
 260
 261 static void vg_init( int argc, char *argv[], const char *window_name )
 262 {
 263 #ifdef VG_STEAM
 264         // Initialize steamworks
 265         if( !sw_init( 1218140U ) )
 266         {
 267                 vg_exiterr( "Steamworks failed to initialize" );
 268         }
 269         else
 270         {
 271                 vg_register_exit( &sw_SteamAPI_Shutdown, "SteamAPI" );
 272         }
 273 #endif
 274
 275         // Context creation
 276         // ==========================================================================================================================
 277         glfwInit();
 278         glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );
 279         glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );
 280         glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
 281         glfwWindowHint( GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE );
 282
 283         glfwWindowHint( GLFW_SAMPLES, 4 );
 284
 285         GLFWmonitor *monitor_primary = glfwGetPrimaryMonitor();
 286
 287         const GLFWvidmode *mode = glfwGetVideoMode( monitor_primary );
 288         glfwWindowHint( GLFW_RED_BITS, mode->redBits );
 289         glfwWindowHint( GLFW_GREEN_BITS, mode->greenBits );
 290         glfwWindowHint( GLFW_BLUE_BITS, mode->blueBits );
 291         glfwWindowHint( GLFW_REFRESH_RATE, mode->refreshRate );
 292
 293         if( !(vg_window = glfwCreateWindow( vg_window_x, vg_window_y, window_name, NULL, NULL)) )
 294         {
 295                 vg_exiterr( "GLFW Failed to initialize" );
 296         }
 297         else
 298         {
 299                 vg_register_exit( &glfwTerminate, "glfwTerminate" );
 300         }
 301
 302         glfwMakeContextCurrent( vg_window );
 303         glfwSwapInterval( 1 );
 304
 305         // Set callbacks
 306         glfwSetFramebufferSizeCallback( vg_window, vg_framebuffer_resize_callback );
 307
 308         glfwSetCursorPosCallback( vg_window, vg_mouse_callback );
 309         glfwSetScrollCallback( vg_window, vg_scroll_callback );
 310
 311         //glfwSetCharCallback( vg_window, console_proc_wchar );
 312         //glfwSetKeyCallback( vg_window, console_proc_key );
 313         //glfwSetInputMode(vg_window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
 314
 315         if( !gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) )
 316         {
 317                 vg_exiterr( "Glad failed to initialize" );
 318         }
 319
 320         const unsigned char* glver = glGetString( GL_VERSION );
 321         vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 322
 323         for( int id = 0; id <= GLFW_JOYSTICK_LAST; id ++ )
 324         {
 325                 if( glfwJoystickIsGamepad( id ) )
 326                 {
 327                         vg_gamepad_name = glfwGetGamepadName( id );
 328                         vg_success( "Gamepad with mapping registered: %s\n", vg_gamepad_name );
 329
 330                         vg_gamepad_ready = 1;
 331                         vg_gamepad_id = id;
 332
 333                         return;
 334                 }
 335         }
 336
 337         vg_audio_init();
 338         vg_register_exit( &vg_audio_free, "vg_audio_free" );
 339         vg_lines_init();
 340         vg_register_exit( &vg_lines_free, "vg_lines_free" );
 341
 342         vg_start();
 343         vg_register_exit( &vg_free, "vg_free" );
 344
 345         if( vg_shaders_compile() )
 346         {
 347                 // Main gameloop
 348                 while( !glfwWindowShouldClose( vg_window ) )
 349                 {
 350                         glfwPollEvents();
 351
 352                         #ifdef VG_STEAM
 353                         sw_RunSteamEventLoop();
 354                         #endif
 355
 356                         vg_time_last = vg_time;
 357                         vg_time = glfwGetTime();
 358                         vg_time_delta = vg_min( vg_time - vg_time_last, 0.1f );
 359
 360                         vg_update_inputs();
 361                         vg_update();
 362                         vg_render();
 363
 364                         vg_lines_drawall();
 365
 366                         vg_ui();
 367
 368                         glfwSwapBuffers( vg_window );
 369
 370                         VG_CHECK_GL();
 371                 }
 372         }
 373
 374         vg_exit();
 375 }
 376
 377 u32 NvOptimusEnablement = 0x00000001;
 378 int AmdPowerXpressRequestHighPerformance = 1;