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 #include <ctype.h>
  10
  11 #include "gl/glad/glad.h"
  12 #include "gl/glfw3.h"
  13
  14 #define STB_DS_IMPLEMENTATION
  15 #define STB_IMAGE_IMPLEMENTATION
  16 #include "stb/stb_ds.h"
  17 #include "stb/stb_image.h"
  18
  19 #include "vg/vg_platform.h"
  20
  21 void vg_register_exit( void( *funcptr )(void), const char *name );
  22 void vg_exiterr( const char *strErr );
  23
  24 m3x3f vg_pv;
  25
  26 #include "vg/vg_m.h"
  27 #include "vg/vg_io.h"
  28 #include "vg/vg_gldiag.h"
  29
  30 #ifndef VG_TOOLS
  31
  32 // Engine globals
  33 GLFWwindow* vg_window;
  34 int vg_window_x = 1280;
  35 int vg_window_y = 720;
  36
  37 v2f vg_mouse;
  38 v3f vg_mouse_ws;
  39
  40 float   vg_time;
  41 float   vg_time_last;
  42 float   vg_time_delta;
  43
  44 // Engine components
  45 #include "vg/vg_audio.h"
  46 #include "vg/vg_shader.h"
  47 #include "vg/vg_lines.h"
  48 #include "vg/vg_tex.h"
  49 #include "vg/vg_input.h"
  50 #include "vg/vg_ui.h"
  51 #include "vg/vg_console.h"
  52 #include "vg/vg_debug.h"
  53
  54 #include "steam/steamworks_thin.h"
  55
  56 // Engine main
  57 // ===========================================================================================================
  58
  59 #ifndef VG_RELEASE
  60 void vg_checkgl( const char *src_info )
  61 {
  62         GLenum err;
  63         while( (err = glGetError()) != GL_NO_ERROR )
  64         {
  65                 vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
  66         }
  67 }
  68
  69  #define VG_STRINGIT( X ) #X
  70  #define VG_CHECK_GL() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
  71 #else
  72  #define VG_CHECK_GL()
  73 #endif
  74
  75
  76 #define VG_GAMELOOP
  77
  78 void( *vg_on_exit[16] )(void);
  79 u32 vg_exit_count = 0;
  80
  81 // Add a shutdown step
  82 void vg_register_exit( void( *funcptr )(void), const char *name )
  83 {
  84         vg_info( "exit registered: (%u)'%s'\n", vg_exit_count, name );
  85         vg_on_exit[ vg_exit_count ++ ] = funcptr;
  86 }
  87
  88 void vg_exit(void)
  89 {
  90         for( int i = vg_exit_count-1; i >= 0; i -- )
  91         {
  92                 vg_info( "engine_exit[%d]()\n", i );
  93                 vg_on_exit[i]();
  94         }
  95
  96         vg_info( "done\n" );
  97 }
  98
  99 // Forcefully exit program after error
 100 void vg_exiterr( const char *strErr )
 101 {
 102         vg_error( "Engine Fatal: %s\n", strErr );
 103         vg_exit();
 104         exit(0);
 105 }
 106
 107 // Callbacks
 108 // ---------
 109
 110 void vg_mouse_callback( GLFWwindow* ptrW, double xpos, double ypos )
 111 {
 112         vg_mouse[0] = xpos;
 113         vg_mouse[1] = ypos;
 114 }
 115
 116 void vg_scroll_callback( GLFWwindow* ptrW, double xoffset, double yoffset )
 117 {
 118
 119 }
 120
 121 void vg_framebuffer_resize_callback( GLFWwindow *ptrW, int w, int h )
 122 {
 123         vg_window_x = w;
 124         vg_window_y = h;
 125 }
 126
 127 static void vg_register(void) VG_GAMELOOP;
 128 static void vg_start(void) VG_GAMELOOP;
 129 static void vg_update(void) VG_GAMELOOP;
 130 static void vg_render(void) VG_GAMELOOP;
 131 static void vg_ui(void) VG_GAMELOOP;
 132 static void vg_free(void) VG_GAMELOOP;
 133
 134 static void vg_init( int argc, char *argv[], const char *window_name )
 135 {
 136 #ifdef VG_STEAM
 137         // Initialize steamworks
 138         if( !sw_init( 1218140U ) )
 139         {
 140                 vg_exiterr( "Steamworks failed to initialize" );
 141         }
 142         else
 143         {
 144                 vg_register_exit( &sw_SteamAPI_Shutdown, "SteamAPI" );
 145         }
 146 #endif
 147
 148         // Context creation
 149         // ==========================================================================================================================
 150         glfwInit();
 151         glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );
 152         glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );
 153         glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
 154         glfwWindowHint( GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE );
 155
 156         glfwWindowHint( GLFW_SAMPLES, 4 );
 157
 158         GLFWmonitor *monitor_primary = glfwGetPrimaryMonitor();
 159
 160         const GLFWvidmode *mode = glfwGetVideoMode( monitor_primary );
 161         glfwWindowHint( GLFW_RED_BITS, mode->redBits );
 162         glfwWindowHint( GLFW_GREEN_BITS, mode->greenBits );
 163         glfwWindowHint( GLFW_BLUE_BITS, mode->blueBits );
 164         glfwWindowHint( GLFW_REFRESH_RATE, mode->refreshRate );
 165
 166         if( !(vg_window = glfwCreateWindow( vg_window_x, vg_window_y, window_name, NULL, NULL)) )
 167         {
 168                 vg_exiterr( "GLFW Failed to initialize" );
 169         }
 170         else
 171         {
 172                 vg_register_exit( &glfwTerminate, "glfwTerminate" );
 173         }
 174
 175         glfwMakeContextCurrent( vg_window );
 176         glfwSwapInterval( 1 );
 177
 178         // Set callbacks
 179         glfwSetFramebufferSizeCallback( vg_window, vg_framebuffer_resize_callback );
 180
 181         glfwSetCursorPosCallback( vg_window, vg_mouse_callback );
 182         glfwSetScrollCallback( vg_window, vg_scroll_callback );
 183
 184         glfwSetCharCallback( vg_window, console_proc_wchar );
 185         glfwSetKeyCallback( vg_window, console_proc_key );
 186         //glfwSetInputMode(vg_window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
 187
 188         if( !gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) )
 189         {
 190                 vg_exiterr( "Glad failed to initialize" );
 191         }
 192
 193         const unsigned char* glver = glGetString( GL_VERSION );
 194         vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 195
 196         vg_console_init();
 197         vg_register_exit( &vg_console_free, "Console" );
 198
 199         vg_run_gfx_diagnostics();
 200
 201         for( int id = 0; id <= GLFW_JOYSTICK_LAST; id ++ )
 202         {
 203                 if( glfwJoystickIsGamepad( id ) )
 204                 {
 205                         vg_gamepad_name = glfwGetGamepadName( id );
 206                         vg_success( "Gamepad with mapping registered: %s\n", vg_gamepad_name );
 207
 208                         vg_gamepad_ready = 1;
 209                         vg_gamepad_id = id;
 210
 211                         break;
 212                 }
 213         }
 214
 215         vg_lines_init();
 216         vg_register_exit( &vg_lines_free, "vg_lines_free" );
 217         ui_default_init();
 218         vg_register_exit( &ui_default_free, "UI" );
 219
 220         vg_register();
 221         vg_register_exit( &vg_free, "vg_free" );
 222
 223         if( vg_shaders_compile() )
 224         {
 225                 vg_start();
 226
 227                 vg_audio_init();
 228                 vg_register_exit( &vg_audio_free, "vg_audio_free" );
 229
 230                 vg_debugtools_setup();
 231
 232                 // Main gameloop
 233                 while( !glfwWindowShouldClose( vg_window ) )
 234                 {
 235                         glfwPollEvents();
 236
 237                         #ifdef VG_STEAM
 238                         sw_RunSteamEventLoop();
 239                         #endif
 240
 241                         vg_time_last = vg_time;
 242                         vg_time = glfwGetTime();
 243                         vg_time_delta = vg_minf( vg_time - vg_time_last, 0.1f );
 244
 245                         vg_update_inputs();
 246                         vg_update();
 247                         vg_render();
 248
 249                         vg_lines_drawall((float*)vg_pv);
 250
 251                         {
 252                                 ui_begin( &ui_global_ctx, vg_window_x, vg_window_y );
 253
 254                                 // TODO: Find a more elegent form for this
 255                                 int mouse_state = 0;
 256                                 if( vg_get_button( "primary" ) ) mouse_state = 2;
 257                                 if( vg_get_button_down( "primary" ) ) mouse_state = 1;
 258                                 if( vg_get_button_up( "primary" ) ) mouse_state = 3;
 259
 260                                 ui_set_mouse( &ui_global_ctx, vg_mouse[0], vg_mouse[1], mouse_state );
 261
 262                                 vg_ui();
 263                                 vg_console_draw();
 264                                 vg_debugtools_draw();
 265
 266                                 ui_resolve( &ui_global_ctx );
 267                                 m3x3f view = M3X3_IDENTITY;
 268                                 m3x3_translate( view, (v3f){ -1.0f, 1.0f, 0.0f } );
 269                                 m3x3_scale( view, (v3f){ 1.0f/((float)vg_window_x*0.5f), -1.0f/((float)vg_window_y*0.5f), 1.0f } );
 270                                 ui_draw( &ui_global_ctx );
 271                         }
 272
 273                         glfwSwapBuffers( vg_window );
 274
 275                         VG_CHECK_GL();
 276                 }
 277         }
 278
 279         vg_exit();
 280 }
 281
 282 // Screen projections
 283 // ============================================================================================
 284
 285 void vg_projection_update(void)
 286 {
 287         // Do transform local->world
 288         vg_mouse_ws[0] = vg_mouse[0];
 289         vg_mouse_ws[1] = vg_mouse[1];
 290         vg_mouse_ws[2] = 1.0f;
 291
 292         vg_mouse_ws[0] =   (2.0f * vg_mouse_ws[0]) / ((float)vg_window_x) - 1.0f;
 293         vg_mouse_ws[1] = -((2.0f * vg_mouse_ws[1]) / ((float)vg_window_y) - 1.0f);
 294
 295         m3x3f inverse;
 296         m3x3_inv( vg_pv, inverse );
 297         m3x3_mulv( inverse, vg_mouse_ws, vg_mouse_ws );
 298 }
 299
 300 #endif
 301
 302 u32 NvOptimusEnablement = 0x00000001;
 303 int AmdPowerXpressRequestHighPerformance = 1;