src/vg/vg.h

   1 /* Copyright (C) 2021 Harry Godden (hgn) - All Rights Reserved */
   2
   3 #ifndef VG_HEADER_H
   4 #define VG_HEADER_H
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <dirent.h>
   9 #include <stdint.h>
  10 #include <string.h>
  11 #include <stdarg.h>
  12 #include <ctype.h>
  13 #include <math.h>
  14
  15 #include "glad/glad.h"
  16 #include "glfw/glfw3.h"
  17
  18 #define STB_DS_IMPLEMENTATION
  19 #include "stb/stb_ds.h"
  20
  21 #define QOI_IMPLEMENTATION
  22 #include "phoboslab/qoi.h"
  23
  24 #include "vg/vg_platform.h"
  25
  26 void vg_register_exit( void( *funcptr )(void), const char *name );
  27 void vg_exiterr( const char *strErr );
  28
  29 #include "vg/vg_m.h"
  30 #include "vg/vg_io.h"
  31 #include "vg/vg_gldiag.h"
  32
  33 #ifndef VG_TOOLS
  34
  35 /* Engine globals */
  36 GLFWwindow* vg_window;
  37
  38 #ifdef VG_3D
  39  m4x4f vg_pv;
  40 #else
  41  m3x3f vg_pv;
  42 #endif
  43
  44 #ifdef VG_CAPTURE_MODE
  45 int vg_window_x = 1920;
  46 int vg_window_y = 1080;
  47 #else
  48 int vg_window_x = 1366;
  49 int vg_window_y = 768;
  50 #endif
  51
  52 v2f vg_mouse;
  53 v2f vg_mouse_wheel;
  54 v3f vg_mouse_ws;
  55
  56 double vg_time,
  57        vg_time_last,
  58        vg_time_delta;
  59
  60 #include "vg/vg_audio.h"
  61 #include "vg/vg_shader.h"
  62 #include "vg/vg_tex.h"
  63 #include "vg/vg_input.h"
  64 #include "vg/vg_ui.h"
  65 #include "vg/vg_console.h"
  66 #include "vg/vg_lines.h"
  67 #include "vg/vg_debug.h"
  68
  69 #ifdef VG_STEAM
  70 #include "vg/vg_steamworks.h"
  71 #endif
  72
  73 #ifndef VG_RELEASE
  74 void vg_checkgl( const char *src_info )
  75 {
  76    GLenum err;
  77    while( (err = glGetError()) != GL_NO_ERROR )
  78    {
  79       vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
  80    }
  81 }
  82
  83  #define VG_STRINGIT( X ) #X
  84  #define VG_CHECK_GL() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
  85 #else
  86  #define VG_CHECK_GL()
  87 #endif
  88
  89
  90 #define VG_GAMELOOP
  91
  92 void( *vg_on_exit[16] )(void);
  93 u32 vg_exit_count = 0;
  94
  95 void vg_register_exit( void( *funcptr )(void), const char *name )
  96 {
  97    vg_info( "exit registered: (%u)'%s'\n", vg_exit_count, name );
  98    vg_on_exit[ vg_exit_count ++ ] = funcptr;
  99 }
 100
 101 void vg_exit(void)
 102 {
 103    for( int i = vg_exit_count-1; i >= 0; i -- )
 104    {
 105       vg_info( "engine_exit[%d]()\n", i );
 106       vg_on_exit[i]();
 107    }
 108
 109    vg_info( "done\n" );
 110 }
 111
 112 void vg_exiterr( const char *strErr )
 113 {
 114    vg_error( "Engine Fatal: %s\n", strErr );
 115    vg_exit();
 116    exit(0);
 117 }
 118
 119 void vg_mouse_callback( GLFWwindow* ptrW, double xpos, double ypos )
 120 {
 121    vg_mouse[0] = xpos;
 122    vg_mouse[1] = ypos;
 123 }
 124
 125 void vg_scroll_callback( GLFWwindow* ptrW, double xoffset, double yoffset )
 126 {
 127    vg_mouse_wheel[0] += xoffset;
 128    vg_mouse_wheel[1] += yoffset;
 129 }
 130
 131
 132 static void vg_register(void) VG_GAMELOOP;
 133 static void vg_start(void) VG_GAMELOOP;
 134 static void vg_update(void) VG_GAMELOOP;
 135 static void vg_framebuffer_resize(int w, int h) VG_GAMELOOP;
 136 static void vg_render(void) VG_GAMELOOP;
 137 static void vg_ui(void) VG_GAMELOOP;
 138 static void vg_free(void) VG_GAMELOOP;
 139
 140 void vg_framebuffer_resize_callback( GLFWwindow *ptrW, int w, int h )
 141 {
 142    vg_window_x = w;
 143    vg_window_y = h;
 144
 145 #ifdef VG_FRAMEBUFFER_RESIZE
 146    vg_framebuffer_resize(w,h);
 147 #endif
 148 }
 149
 150 static void vg_init( int argc, char *argv[], const char *window_name )
 151 {
 152 #ifdef VG_STEAM
 153    if( !sw_init() )
 154       return;
 155 #endif
 156
 157    glfwInit();
 158    glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );
 159    glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );
 160    glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
 161    glfwWindowHint( GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE );
 162
 163 #ifdef VG_CAPTURE_MODE
 164    glfwWindowHint( GLFW_RESIZABLE, GLFW_FALSE );
 165 #else
 166    glfwWindowHint( GLFW_RESIZABLE, GLFW_TRUE );
 167 #endif
 168    glfwWindowHint(GLFW_DOUBLEBUFFER, GLFW_TRUE);
 169
 170 #if 0
 171    glfwWindowHint(GLFW_SAMPLES,4);
 172 #endif
 173
 174    GLFWmonitor *monitor_primary = glfwGetPrimaryMonitor();
 175
 176    const GLFWvidmode *mode = glfwGetVideoMode( monitor_primary );
 177    glfwWindowHint( GLFW_RED_BITS, mode->redBits );
 178    glfwWindowHint( GLFW_GREEN_BITS, mode->greenBits );
 179    glfwWindowHint( GLFW_BLUE_BITS, mode->blueBits );
 180
 181    int refresh_rate = mode->refreshRate;
 182
 183    if( refresh_rate < 28 || refresh_rate >= 144 )
 184       refresh_rate = 60;
 185
 186    glfwWindowHint( GLFW_REFRESH_RATE, refresh_rate );
 187
 188    if( !(vg_window = glfwCreateWindow( vg_window_x, vg_window_y,
 189                                        window_name, NULL, NULL)) )
 190       vg_exiterr( "GLFW Failed to initialize" );
 191    else
 192       vg_register_exit( &glfwTerminate, "glfwTerminate" );
 193
 194    glfwMakeContextCurrent( vg_window );
 195    glfwSwapInterval( 1 );
 196
 197    glfwSetWindowSizeLimits( vg_window, 800, 600, GLFW_DONT_CARE,GLFW_DONT_CARE);
 198    glfwSetFramebufferSizeCallback( vg_window, vg_framebuffer_resize_callback );
 199
 200    glfwSetCursorPosCallback( vg_window, vg_mouse_callback );
 201    glfwSetScrollCallback( vg_window, vg_scroll_callback );
 202
 203    glfwSetCharCallback( vg_window, console_proc_wchar );
 204    glfwSetKeyCallback( vg_window, console_proc_key );
 205 #if 0
 206    glfwSetInputMode(vg_window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
 207 #endif
 208
 209    if( !gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) )
 210       vg_exiterr( "Glad failed to initialize" );
 211
 212    const unsigned char* glver = glGetString( GL_VERSION );
 213    vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 214
 215    vg_run_gfx_diagnostics();
 216
 217    vg_gamepad_init();
 218    vg_lines_init();
 219    vg_register_exit( &vg_lines_free, "vg_lines_free" );
 220    ui_default_init();
 221    vg_register_exit( &ui_default_free, "UI" );
 222
 223    vg_register();
 224    vg_register_exit( &vg_free, "vg_free" );
 225
 226    if( vg_shaders_compile() )
 227    {
 228       vg_start();
 229
 230       vg_console_init();
 231       vg_register_exit( &vg_console_free, "Console" );
 232
 233       vg_audio_init();
 234       vg_register_exit( &vg_audio_free, "vg_audio_free" );
 235
 236       vg_debugtools_setup();
 237
 238       /*
 239        * Main gameloop
 240        */
 241       while( !glfwWindowShouldClose( vg_window ) )
 242       {
 243          v2_copy( (v2f){ 0.0f, 0.0f }, vg_mouse_wheel );
 244
 245          glfwPollEvents();
 246
 247          #ifdef VG_STEAM
 248          sw_event_loop();
 249          #endif
 250
 251          vg_time_last = vg_time;
 252          vg_time = glfwGetTime();
 253          vg_time_delta = vg_minf( vg_time - vg_time_last, 0.1f );
 254
 255          vg_update_inputs();
 256          vg_update();
 257          vg_render();
 258
 259          vg_lines_drawall((float*)vg_pv);
 260
 261          {
 262             ui_begin( &ui_global_ctx, vg_window_x, vg_window_y );
 263             ui_set_mouse( &ui_global_ctx, vg_mouse[0], vg_mouse[1],
 264                   vg_get_button_state( "primary" ) );
 265
 266             vg_ui();
 267             vg_console_draw();
 268             vg_debugtools_draw();
 269
 270             ui_resolve( &ui_global_ctx );
 271             ui_draw( &ui_global_ctx, NULL );
 272          }
 273
 274          glfwSwapBuffers( vg_window );
 275          VG_CHECK_GL();
 276       }
 277    }
 278
 279    vg_exit();
 280 }
 281
 282 #ifndef VG_3D
 283 void vg_projection_update(void)
 284 {
 285    /*
 286     * Reproject screenspace mouse into world
 287     */
 288
 289    vg_mouse_ws[0] = vg_mouse[0];
 290    vg_mouse_ws[1] = vg_mouse[1];
 291    vg_mouse_ws[2] = 1.0f;
 292
 293    vg_mouse_ws[0] =   (2.0f * vg_mouse_ws[0]) / ((float)vg_window_x) - 1.0f;
 294    vg_mouse_ws[1] = -((2.0f * vg_mouse_ws[1]) / ((float)vg_window_y) - 1.0f);
 295
 296    m3x3f inverse;
 297    m3x3_inv( vg_pv, inverse );
 298    m3x3_mulv( inverse, vg_mouse_ws, vg_mouse_ws );
 299 }
 300 #endif
 301
 302 #endif
 303
 304 /*
 305  * Graphic cards will check these to force it to use the GPU
 306  */
 307 u32 NvOptimusEnablement = 0x00000001;
 308 int AmdPowerXpressRequestHighPerformance = 1;
 309
 310 #endif