src/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 "glad/glad.h"
  13 #include "glfw/glfw3.h"
  14
  15 #define STB_DS_IMPLEMENTATION
  16 #include "stb/stb_ds.h"
  17
  18 #define QOI_IMPLEMENTATION
  19 #include "phoboslab/qoi.h"
  20
  21 #include "vg/vg_platform.h"
  22
  23 void vg_register_exit( void( *funcptr )(void), const char *name );
  24 void vg_exiterr( const char *strErr );
  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 m3x3f vg_pv;
  35
  36 #ifdef VG_CAPTURE_MODE
  37 int vg_window_x = 1920;
  38 int vg_window_y = 1080;
  39 #else
  40 int vg_window_x = 1366;
  41 int vg_window_y = 768;
  42 #endif
  43
  44 v2f vg_mouse;
  45 v2f vg_mouse_wheel;
  46 v3f vg_mouse_ws;
  47
  48 double vg_time,
  49        vg_time_last,
  50        vg_time_delta;
  51
  52 #include "vg/vg_audio.h"
  53 #include "vg/vg_shader.h"
  54 #include "vg/vg_lines.h"
  55 #include "vg/vg_tex.h"
  56 #include "vg/vg_input.h"
  57 #include "vg/vg_ui.h"
  58 #include "vg/vg_console.h"
  59 #include "vg/vg_debug.h"
  60
  61 #ifdef VG_STEAM
  62 #include "vg/vg_steamworks.h"
  63 #endif
  64
  65 #ifndef VG_RELEASE
  66 void vg_checkgl( const char *src_info )
  67 {
  68         GLenum err;
  69         while( (err = glGetError()) != GL_NO_ERROR )
  70         {
  71                 vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
  72         }
  73 }
  74
  75  #define VG_STRINGIT( X ) #X
  76  #define VG_CHECK_GL() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
  77 #else
  78  #define VG_CHECK_GL()
  79 #endif
  80
  81
  82 #define VG_GAMELOOP
  83
  84 void( *vg_on_exit[16] )(void);
  85 u32 vg_exit_count = 0;
  86
  87 void vg_register_exit( void( *funcptr )(void), const char *name )
  88 {
  89         vg_info( "exit registered: (%u)'%s'\n", vg_exit_count, name );
  90         vg_on_exit[ vg_exit_count ++ ] = funcptr;
  91 }
  92
  93 void vg_exit(void)
  94 {
  95         for( int i = vg_exit_count-1; i >= 0; i -- )
  96         {
  97                 vg_info( "engine_exit[%d]()\n", i );
  98                 vg_on_exit[i]();
  99         }
 100
 101         vg_info( "done\n" );
 102 }
 103
 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 void vg_mouse_callback( GLFWwindow* ptrW, double xpos, double ypos )
 112 {
 113         vg_mouse[0] = xpos;
 114         vg_mouse[1] = ypos;
 115 }
 116
 117 void vg_scroll_callback( GLFWwindow* ptrW, double xoffset, double yoffset )
 118 {
 119         vg_mouse_wheel[0] += xoffset;
 120         vg_mouse_wheel[1] += yoffset;
 121 }
 122
 123
 124 static void vg_register(void) VG_GAMELOOP;
 125 static void vg_start(void) VG_GAMELOOP;
 126 static void vg_update(void) VG_GAMELOOP;
 127 static void vg_framebuffer_resize(int w, int h) VG_GAMELOOP;
 128 static void vg_render(void) VG_GAMELOOP;
 129 static void vg_ui(void) VG_GAMELOOP;
 130 static void vg_free(void) VG_GAMELOOP;
 131
 132 void vg_framebuffer_resize_callback( GLFWwindow *ptrW, int w, int h )
 133 {
 134         vg_window_x = w;
 135         vg_window_y = h;
 136
 137 #ifdef VG_FRAMEBUFFER_RESIZE
 138    vg_framebuffer_resize(w,h);
 139 #endif
 140 }
 141
 142 static void vg_init( int argc, char *argv[], const char *window_name )
 143 {
 144 #ifdef VG_STEAM
 145         if( !sw_init() )
 146                 return;
 147 #endif
 148
 149         glfwInit();
 150         glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );
 151         glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );
 152         glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
 153         glfwWindowHint( GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE );
 154
 155 #ifdef VG_CAPTURE_MODE
 156         glfwWindowHint( GLFW_RESIZABLE, GLFW_FALSE );
 157 #else
 158         glfwWindowHint( GLFW_RESIZABLE, GLFW_TRUE );
 159 #endif
 160    glfwWindowHint(GLFW_DOUBLEBUFFER, GLFW_TRUE);
 161
 162 #if 0
 163    glfwWindowHint(GLFW_SAMPLES,4);
 164 #endif
 165
 166         GLFWmonitor *monitor_primary = glfwGetPrimaryMonitor();
 167
 168         const GLFWvidmode *mode = glfwGetVideoMode( monitor_primary );
 169         glfwWindowHint( GLFW_RED_BITS, mode->redBits );
 170         glfwWindowHint( GLFW_GREEN_BITS, mode->greenBits );
 171         glfwWindowHint( GLFW_BLUE_BITS, mode->blueBits );
 172
 173    int refresh_rate = mode->refreshRate;
 174
 175    if( refresh_rate < 28 || refresh_rate >= 144 )
 176       refresh_rate = 60;
 177
 178         glfwWindowHint( GLFW_REFRESH_RATE, refresh_rate );
 179
 180         if( !(vg_window = glfwCreateWindow( vg_window_x, vg_window_y,
 181                                        window_name, NULL, NULL)) )
 182                 vg_exiterr( "GLFW Failed to initialize" );
 183         else
 184                 vg_register_exit( &glfwTerminate, "glfwTerminate" );
 185
 186         glfwMakeContextCurrent( vg_window );
 187         glfwSwapInterval( 1 );
 188
 189    glfwSetWindowSizeLimits( vg_window, 800, 600, GLFW_DONT_CARE,GLFW_DONT_CARE);
 190         glfwSetFramebufferSizeCallback( vg_window, vg_framebuffer_resize_callback );
 191
 192         glfwSetCursorPosCallback( vg_window, vg_mouse_callback );
 193         glfwSetScrollCallback( vg_window, vg_scroll_callback );
 194
 195         glfwSetCharCallback( vg_window, console_proc_wchar );
 196         glfwSetKeyCallback( vg_window, console_proc_key );
 197 #if 0
 198         glfwSetInputMode(vg_window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
 199 #endif
 200
 201         if( !gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) )
 202                 vg_exiterr( "Glad failed to initialize" );
 203
 204         const unsigned char* glver = glGetString( GL_VERSION );
 205         vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 206
 207         vg_run_gfx_diagnostics();
 208
 209         for( int id = 0; id <= GLFW_JOYSTICK_LAST; id ++ )
 210         {
 211                 if( glfwJoystickIsGamepad( id ) )
 212                 {
 213                         vg_gamepad_name = glfwGetGamepadName( id );
 214                         vg_success( "Gamepad with mapping registered: %s\n", vg_gamepad_name );
 215
 216                         vg_gamepad_ready = 1;
 217                         vg_gamepad_id = id;
 218
 219                         break;
 220                 }
 221         }
 222
 223         vg_lines_init();
 224         vg_register_exit( &vg_lines_free, "vg_lines_free" );
 225         ui_default_init();
 226         vg_register_exit( &ui_default_free, "UI" );
 227
 228         vg_register();
 229         vg_register_exit( &vg_free, "vg_free" );
 230
 231         if( vg_shaders_compile() )
 232         {
 233                 vg_start();
 234
 235                 vg_console_init();
 236                 vg_register_exit( &vg_console_free, "Console" );
 237
 238                 vg_audio_init();
 239                 vg_register_exit( &vg_audio_free, "vg_audio_free" );
 240
 241                 vg_debugtools_setup();
 242
 243       /*
 244        * Main gameloop
 245        */
 246                 while( !glfwWindowShouldClose( vg_window ) )
 247                 {
 248                         v2_copy( (v2f){ 0.0f, 0.0f }, vg_mouse_wheel );
 249
 250                         glfwPollEvents();
 251
 252                         #ifdef VG_STEAM
 253                         sw_event_loop();
 254                         #endif
 255
 256                         vg_time_last = vg_time;
 257                         vg_time = glfwGetTime();
 258                         vg_time_delta = vg_minf( vg_time - vg_time_last, 0.1f );
 259
 260                         vg_update_inputs();
 261                         vg_update();
 262                         vg_render();
 263
 264                         vg_lines_drawall((float*)vg_pv);
 265
 266                         {
 267                                 ui_begin( &ui_global_ctx, vg_window_x, vg_window_y );
 268                                 ui_set_mouse( &ui_global_ctx, vg_mouse[0], vg_mouse[1],
 269                   vg_get_button_state( "primary" ) );
 270
 271                                 vg_ui();
 272                                 vg_console_draw();
 273                                 vg_debugtools_draw();
 274
 275                                 ui_resolve( &ui_global_ctx );
 276                                 ui_draw( &ui_global_ctx, NULL );
 277                         }
 278
 279                         glfwSwapBuffers( vg_window );
 280                         VG_CHECK_GL();
 281                 }
 282         }
 283
 284         vg_exit();
 285 }
 286
 287 void vg_projection_update(void)
 288 {
 289    /*
 290     * Reproject screenspace mouse into world
 291     */
 292
 293         vg_mouse_ws[0] = vg_mouse[0];
 294         vg_mouse_ws[1] = vg_mouse[1];
 295         vg_mouse_ws[2] = 1.0f;
 296
 297         vg_mouse_ws[0] =   (2.0f * vg_mouse_ws[0]) / ((float)vg_window_x) - 1.0f;
 298         vg_mouse_ws[1] = -((2.0f * vg_mouse_ws[1]) / ((float)vg_window_y) - 1.0f);
 299
 300         m3x3f inverse;
 301         m3x3_inv( vg_pv, inverse );
 302         m3x3_mulv( inverse, vg_mouse_ws, vg_mouse_ws );
 303 }
 304
 305 #endif
 306
 307 /*
 308  * Graphic cards will check these to force it to use the GPU
 309  */
 310 u32 NvOptimusEnablement = 0x00000001;
 311 int AmdPowerXpressRequestHighPerformance = 1;