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