src/client/game.c

   1 #define STB_IMAGE_WRITE_IMPLEMENTATION
   2 #include <GL/glew.h>
   3 #include <GL/gl.h>
   4 #include <GLFW/glfw3.h>
   5 #include <stb/stb_image_write.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include "client/camera.h"
   9 #include "client/client.h"
  10 #include "client/client_entity.h"
  11 #include "client/client_node.h"
  12 #include "client/client_player.h"
  13 #include "client/client_terrain.h"
  14 #include "client/debug_menu.h"
  15 #include "client/font.h"
  16 #include "client/frustum.h"
  17 #include "client/game.h"
  18 #include "client/gl_debug.h"
  19 #include "client/gui.h"
  20 #include "client/input.h"
  21 #include "client/interact.h"
  22 #include "client/sky.h"
  23 #include "client/window.h"
  24 #include "day.h"
  25 #include "interrupt.h"
  26
  27 int game_fps = 0;
  28
  29 static void crosshair_init()
  30 {
  31         gui_add(NULL, (GUIElementDefinition) {
  32                 .pos = {0.5f, 0.5f},
  33                 .z_index = 0.0f,
  34                 .offset = {0, 0},
  35                 .margin = {0, 0},
  36                 .align = {0.5f, 0.5f},
  37                 .scale = {1.0f, 1.0f},
  38                 .scale_type = SCALE_IMAGE,
  39                 .affect_parent_scale = false,
  40                 .text = NULL,
  41                 .image = texture_load(RESSOURCE_PATH "textures/crosshair.png", false),
  42                 .text_color = {0.0f, 0.0f, 0.0f, 0.0f},
  43                 .bg_color = {0.0f, 0.0f, 0.0f, 0.0f},
  44         });
  45 }
  46
  47 static void render(f64 dtime)
  48 {
  49         glEnable(GL_DEPTH_TEST); GL_DEBUG
  50         glEnable(GL_BLEND); GL_DEBUG
  51         glEnable(GL_MULTISAMPLE); GL_DEBUG
  52         glEnable(GL_CULL_FACE); GL_DEBUG
  53
  54         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); GL_DEBUG
  55         glCullFace(GL_BACK); GL_DEBUG
  56         glFrontFace(GL_CCW); GL_DEBUG
  57
  58         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); GL_DEBUG
  59
  60         frustum_update();
  61         terrain_gfx_update();
  62         client_entity_gfx_update();
  63
  64         sky_render();
  65         model_scene_render(dtime);
  66         interact_render();
  67         gui_render();
  68 }
  69
  70 static void game_loop()
  71 {
  72         f64 fps_update_timer = 1.0f;
  73         unsigned int frames = 0;
  74
  75         struct timespec ts, ts_old;
  76         clock_gettime(CLOCK_REALTIME, &ts_old);
  77
  78         while (!glfwWindowShouldClose(window.handle) && !interrupt.set) {
  79                 clock_gettime(CLOCK_REALTIME, &ts);
  80                 f64 dtime = (f64) (ts.tv_sec - ts_old.tv_sec) + (f64) (ts.tv_nsec - ts_old.tv_nsec) / 1.0e9;
  81                 ts_old = ts;
  82
  83                 if ((fps_update_timer -= dtime) <= 0.0) {
  84                         debug_menu_changed(ENTRY_FPS);
  85                         game_fps = frames;
  86                         fps_update_timer += 1.0;
  87                         frames = 0;
  88                 }
  89
  90                 frames++;
  91
  92                 input_tick(dtime);
  93                 client_player_tick(dtime);
  94                 interact_tick();
  95
  96                 debug_menu_changed(ENTRY_TIME);
  97                 debug_menu_changed(ENTRY_DAYLIGHT);
  98                 debug_menu_changed(ENTRY_SUN_ANGLE);
  99                 debug_menu_update();
 100
 101                 render(dtime);
 102
 103                 glfwSwapBuffers(window.handle);
 104                 glfwPollEvents();
 105         }
 106 }
 107
 108 bool game(Flag *gfx_init)
 109 {
 110         if (!window_init())
 111                 return false;
 112
 113         if (!font_init())
 114                 return false;
 115
 116         model_init();
 117
 118         if (!sky_init())
 119                 return false;
 120
 121         if (!terrain_gfx_init())
 122                 return false;
 123
 124         if (!client_entity_gfx_init())
 125                 return false;
 126
 127         client_player_gfx_init();
 128
 129         if (!interact_init())
 130                 return false;
 131
 132         client_node_init();
 133         client_terrain_start();
 134
 135         camera_set_position((v3f32) {0.0f, 0.0f, 0.0f});
 136         camera_set_angle(0.0f, 0.0f);
 137
 138         if (!gui_init())
 139                 return false;
 140
 141         debug_menu_init();
 142         crosshair_init();
 143         input_init();
 144
 145         flag_set(gfx_init);
 146         game_loop();
 147
 148         client_terrain_stop();
 149
 150         font_deinit();
 151         gui_deinit();
 152         model_deinit();
 153         sky_deinit();
 154         terrain_gfx_deinit();
 155         client_entity_gfx_deinit();
 156         client_player_gfx_deinit();
 157         interact_deinit();
 158
 159         return true;
 160 }
 161
 162 char *game_take_screenshot()
 163 {
 164         // renderbuffer for depth & stencil buffer
 165         GLuint rbo;
 166         glGenRenderbuffers(1, &rbo); GL_DEBUG
 167         glBindRenderbuffer(GL_RENDERBUFFER, rbo); GL_DEBUG
 168         glRenderbufferStorageMultisample(GL_RENDERBUFFER, 8, GL_DEPTH24_STENCIL8, window.width, window.height); GL_DEBUG
 169
 170         // 2 textures, one with AA, one without
 171
 172         GLuint txos[2];
 173         glGenTextures(2, txos); GL_DEBUG
 174
 175         glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, txos[0]); GL_DEBUG
 176         glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 8, GL_RGB, window.width, window.height, GL_TRUE); GL_DEBUG
 177
 178         glBindTexture(GL_TEXTURE_2D, txos[1]); GL_DEBUG
 179         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, window.width, window.height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL); GL_DEBUG
 180
 181         // 2 framebuffers, one with AA, one without
 182
 183         GLuint fbos[2];
 184         glGenFramebuffers(2, fbos); GL_DEBUG
 185
 186         glBindFramebuffer(GL_FRAMEBUFFER, fbos[0]); GL_DEBUG
 187         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, txos[0], 0); GL_DEBUG
 188         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo); GL_DEBUG
 189
 190         glBindFramebuffer(GL_FRAMEBUFFER, fbos[1]); GL_DEBUG
 191         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, txos[1], 0); GL_DEBUG
 192
 193         // render scene
 194         glBindFramebuffer(GL_FRAMEBUFFER, fbos[0]); GL_DEBUG
 195         render(0.0);
 196         glBindFramebuffer(GL_FRAMEBUFFER, 0); GL_DEBUG
 197
 198         // blit AA-buffer into no-AA buffer
 199         glBindFramebuffer(GL_READ_FRAMEBUFFER, fbos[0]); GL_DEBUG
 200         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbos[1]); GL_DEBUG
 201         glBlitFramebuffer(0, 0, window.width, window.height, 0, 0, window.width, window.height, GL_COLOR_BUFFER_BIT, GL_NEAREST); GL_DEBUG
 202
 203         // read data
 204         GLubyte data[window.width * window.height * 3];
 205         glBindFramebuffer(GL_FRAMEBUFFER, fbos[1]); GL_DEBUG
 206         glPixelStorei(GL_PACK_ALIGNMENT, 1); GL_DEBUG
 207         glReadPixels(0, 0, window.width, window.height, GL_RGB, GL_UNSIGNED_BYTE, data); GL_DEBUG
 208
 209         // create filename
 210         char filename[BUFSIZ];
 211         time_t timep = time(0);
 212         strftime(filename, BUFSIZ, "screenshot-%Y-%m-%d-%H:%M:%S.png", localtime(&timep));
 213
 214         // save screenshot
 215         stbi_flip_vertically_on_write(true);
 216         stbi_write_png(filename, window.width, window.height, 3, data, window.width * 3);
 217
 218         // delete buffers
 219         glDeleteRenderbuffers(1, &rbo); GL_DEBUG
 220         glDeleteTextures(2, txos); GL_DEBUG
 221         glDeleteFramebuffers(2, fbos); GL_DEBUG
 222
 223         return strdup(filename);
 224 }