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