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_node.h"
  11 #include "client/client_player.h"
  12 #include "client/client_terrain.h"
  13 #include "client/debug_menu.h"
  14 #include "client/font.h"
  15 #include "client/frustum.h"
  16 #include "client/gui.h"
  17 #include "client/input.h"
  18 #include "client/sky.h"
  19 #include "client/window.h"
  20 #include "day.h"
  21 #include "interrupt.h"
  22
  23 int game_fps = 0;
  24
  25 static void crosshair_init()
  26 {
  27         gui_add(NULL, (GUIElementDefinition) {
  28                 .pos = {0.5f, 0.5f},
  29                 .z_index = 0.0f,
  30                 .offset = {0, 0},
  31                 .margin = {0, 0},
  32                 .align = {0.5f, 0.5f},
  33                 .scale = {1.0f, 1.0f},
  34                 .scale_type = SCALE_IMAGE,
  35                 .affect_parent_scale = false,
  36                 .text = NULL,
  37                 .image = texture_load(RESSOURCE_PATH "textures/crosshair.png", false),
  38                 .text_color = {0.0f, 0.0f, 0.0f, 0.0f},
  39                 .bg_color = {0.0f, 0.0f, 0.0f, 0.0f},
  40         });
  41 }
  42
  43 static void render(f64 dtime)
  44 {
  45         glEnable(GL_DEPTH_TEST);
  46         glEnable(GL_ALPHA_TEST);
  47         glEnable(GL_BLEND);
  48         glEnable(GL_MULTISAMPLE);
  49         glEnable(GL_CULL_FACE);
  50
  51         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  52         glAlphaFunc(GL_GREATER, 0.1f);
  53         glCullFace(GL_BACK);
  54         glFrontFace(GL_CCW);
  55
  56         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  57
  58         frustum_update();
  59         terrain_gfx_update();
  60
  61         sky_render();
  62         model_scene_render(dtime);
  63         gui_render();
  64 }
  65
  66 static void game_loop()
  67 {
  68         f64 fps_update_timer = 1.0f;
  69         unsigned int frames = 0;
  70
  71         struct timespec ts, ts_old;
  72         clock_gettime(CLOCK_REALTIME, &ts_old);
  73
  74         while (!glfwWindowShouldClose(window.handle) && !interrupt.set) {
  75                 clock_gettime(CLOCK_REALTIME, &ts);
  76                 f64 dtime = (f64) (ts.tv_sec - ts_old.tv_sec) + (f64) (ts.tv_nsec - ts_old.tv_nsec) / 1.0e9;
  77                 ts_old = ts;
  78
  79                 if ((fps_update_timer -= dtime) <= 0.0) {
  80                         debug_menu_changed(ENTRY_FPS);
  81                         game_fps = frames;
  82                         fps_update_timer += 1.0;
  83                         frames = 0;
  84                 }
  85
  86                 frames++;
  87
  88                 input_tick(dtime);
  89                 client_player_tick(dtime);
  90
  91                 debug_menu_changed(ENTRY_TIME);
  92                 debug_menu_changed(ENTRY_DAYLIGHT);
  93                 debug_menu_changed(ENTRY_SUN_ANGLE);
  94                 debug_menu_update();
  95
  96                 render(dtime);
  97
  98                 glfwSwapBuffers(window.handle);
  99                 glfwPollEvents();
 100         }
 101 }
 102
 103 bool game(Flag *gfx_init)
 104 {
 105         if (!window_init())
 106                 return false;
 107
 108         if (!font_init())
 109                 return false;
 110
 111         model_init();
 112
 113         if (!sky_init())
 114                 return false;
 115
 116         if (!terrain_gfx_init())
 117                 return false;
 118
 119         client_node_init();
 120         client_terrain_start();
 121
 122         camera_set_position((v3f32) {0.0f, 0.0f, 0.0f});
 123         camera_set_angle(0.0f, 0.0f);
 124
 125         if (!gui_init())
 126                 return false;
 127
 128         debug_menu_init();
 129         crosshair_init();
 130         input_init();
 131
 132         flag_set(gfx_init);
 133         game_loop();
 134
 135         client_terrain_stop();
 136
 137         font_deinit();
 138         gui_deinit();
 139         model_deinit();
 140         sky_deinit();
 141         terrain_gfx_deinit();
 142
 143         return true;
 144 }
 145
 146 char *game_take_screenshot()
 147 {
 148         // renderbuffer for depth & stencil buffer
 149         GLuint rbo;
 150         glGenRenderbuffers(1, &rbo);
 151         glBindRenderbuffer(GL_RENDERBUFFER, rbo);
 152         glRenderbufferStorageMultisample(GL_RENDERBUFFER, 8, GL_DEPTH24_STENCIL8, window.width, window.height);
 153
 154         // 2 textures, one with AA, one without
 155
 156         GLuint txos[2];
 157         glGenTextures(2, txos);
 158
 159         glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, txos[0]);
 160         glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 8, GL_RGB, window.width, window.height, GL_TRUE);
 161
 162         glBindTexture(GL_TEXTURE_2D, txos[1]);
 163         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, window.width, window.height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
 164
 165         // 2 framebuffers, one with AA, one without
 166
 167         GLuint fbos[2];
 168         glGenFramebuffers(2, fbos);
 169
 170         glBindFramebuffer(GL_FRAMEBUFFER, fbos[0]);
 171         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, txos[0], 0);
 172         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo);
 173
 174         glBindFramebuffer(GL_FRAMEBUFFER, fbos[1]);
 175         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, txos[1], 0);
 176
 177         // render scene
 178         glBindFramebuffer(GL_FRAMEBUFFER, fbos[0]);
 179         render(0.0);
 180         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 181
 182         // blit AA-buffer into no-AA buffer
 183         glBindFramebuffer(GL_READ_FRAMEBUFFER, fbos[0]);
 184         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbos[1]);
 185         glBlitFramebuffer(0, 0, window.width, window.height, 0, 0, window.width, window.height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
 186
 187         // read data
 188         GLubyte data[window.width * window.height * 3];
 189         glBindFramebuffer(GL_FRAMEBUFFER, fbos[1]);
 190         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 191         glReadPixels(0, 0, window.width, window.height, GL_RGB, GL_UNSIGNED_BYTE, data);
 192
 193         // create filename
 194         char filename[BUFSIZ];
 195         time_t timep = time(0);
 196         strftime(filename, BUFSIZ, "screenshot-%Y-%m-%d-%H:%M:%S.png", localtime(&timep));
 197
 198         // save screenshot
 199         stbi_flip_vertically_on_write(true);
 200         stbi_write_png(filename, window.width, window.height, 3, data, window.width * 3);
 201
 202         // delete buffers
 203         glDeleteRenderbuffers(1, &rbo);
 204         glDeleteTextures(2, txos);
 205         glDeleteFramebuffers(2, fbos);
 206
 207         return strdup(filename);
 208 }