src/ui/console.c

   1 #include <ctype.h>
   2 #include <math.h>
   3
   4 #include "system/stacktrace.h"
   5
   6 #include "game.h"
   7 #include "game/level.h"
   8 #include "sdl/renderer.h"
   9 #include "system/log.h"
  10 #include "system/lt.h"
  11 #include "system/nth_alloc.h"
  12 #include "ui/console.h"
  13 #include "ui/console_log.h"
  14 #include "ui/edit_field.h"
  15 #include "ui/history.h"
  16 #include "math/extrema.h"
  17
  18 #define FONT_WIDTH_SCALE 3.0f
  19 #define FONT_HEIGHT_SCALE 3.0f
  20
  21 #define CONSOLE_LOG_CAPACITY 10
  22 #define HISTORY_CAPACITY 20
  23 #define PROMPT_HEIGHT (FONT_HEIGHT_SCALE * FONT_CHAR_HEIGHT)
  24 #define CONSOLE_LOG_HEIGHT (FONT_HEIGHT_SCALE * FONT_CHAR_HEIGHT * CONSOLE_LOG_CAPACITY)
  25
  26 #define CONSOLE_HEIGHT (CONSOLE_LOG_HEIGHT + PROMPT_HEIGHT)
  27
  28 #define SLIDE_DOWN_TIME 0.4f
  29
  30 #define CONSOLE_ALPHA (0.80f)
  31 #define CONSOLE_BACKGROUND (rgba(0.20f, 0.20f, 0.20f, CONSOLE_ALPHA))
  32 #define CONSOLE_FOREGROUND (rgba(0.80f, 0.80f, 0.80f, CONSOLE_ALPHA))
  33 #define CONSOLE_ERROR (rgba(0.80f, 0.50f, 0.50f, CONSOLE_ALPHA))
  34
  35 typedef struct {
  36     const char *begin;
  37     const char *end;
  38 } Token;
  39
  40
  41 static inline
  42 Token token(const char *begin, const char *end)
  43 {
  44     Token t = {begin, end};
  45     return t;
  46 }
  47
  48 static inline
  49 int token_equals_str(Token t, const char *s)
  50 {
  51     trace_assert(t.begin <= t.end);
  52     size_t n1 = (size_t) (t.end - t.begin);
  53     size_t n2 = strlen(s);
  54     if (n1 != n2) return 0;
  55     return memcmp(t.begin, s, n1) == 0;
  56 }
  57
  58 static inline
  59 Token token_nt(const char *s)
  60 {
  61     return token(s, s + strlen(s));
  62 }
  63
  64 static inline
  65 void ltrim(Token *t)
  66 {
  67     while (t->begin < t->end && isspace(*t->begin)) {
  68         t->begin++;
  69     }
  70 }
  71
  72 static inline
  73 Token chop_word(Token *t)
  74 {
  75     ltrim(t);
  76     const char *end = t->begin;
  77     while (end < t->end && !isspace(*end)) {
  78         end++;
  79     }
  80     Token result = token(t->begin, end);
  81     t->begin = end;
  82     return result;
  83 }
  84
  85 struct Console
  86 {
  87     Lt *lt;
  88     Edit_field *edit_field;
  89     Console_Log *console_log;
  90     History *history;
  91     Game *game;
  92     float a;
  93 };
  94
  95 /* TODO(#356): Console does not support autocompletion */
  96 /* TODO(#358): Console does not support copy, cut, paste operations */
  97
  98 Console *create_console(Game *game)
  99 {
 100     Lt *lt = create_lt();
 101
 102     Console *console = PUSH_LT(lt, nth_calloc(1, sizeof(Console)), free);
 103     if (console == NULL) {
 104         RETURN_LT(lt, NULL);
 105     }
 106     console->lt = lt;
 107
 108     console->edit_field = PUSH_LT(
 109         lt,
 110         create_edit_field(
 111             vec(FONT_WIDTH_SCALE, FONT_HEIGHT_SCALE),
 112             CONSOLE_FOREGROUND),
 113         destroy_edit_field);
 114     if (console->edit_field == NULL) {
 115         RETURN_LT(lt, NULL);
 116     }
 117
 118     console->console_log = PUSH_LT(
 119         lt,
 120         create_console_log(
 121             vec(FONT_WIDTH_SCALE, FONT_HEIGHT_SCALE),
 122             CONSOLE_LOG_CAPACITY),
 123         destroy_console_log);
 124
 125     console->a = 0;
 126
 127     console->history = PUSH_LT(
 128         lt,
 129         create_history(HISTORY_CAPACITY),
 130         destroy_history);
 131     if (console->history == NULL) {
 132         RETURN_LT(lt, NULL);
 133     }
 134
 135     console->game = game;
 136
 137     return console;
 138 }
 139
 140 void destroy_console(Console *console)
 141 {
 142     trace_assert(console);
 143     RETURN_LT0(console->lt);
 144 }
 145
 146 static int console_eval_input(Console *console)
 147 {
 148     const char *source_code = edit_field_as_text(console->edit_field);
 149
 150     /* TODO(#387): console pushes empty strings to the history */
 151     if (history_push(console->history, source_code) < 0) {
 152         return -1;
 153     }
 154
 155     if (console_log_push_line(console->console_log, source_code, NULL, CONSOLE_FOREGROUND) < 0) {
 156         return -1;
 157     }
 158
 159     Token input = token_nt(source_code);
 160
 161     Token command = chop_word(&input);
 162     if (token_equals_str(command, "load")) {
 163         Token level = chop_word(&input);
 164         console_log_push_line(console->console_log, "Loading level:", NULL, CONSOLE_FOREGROUND);
 165         console_log_push_line(console->console_log, level.begin, level.end, CONSOLE_FOREGROUND);
 166         char level_name[256];
 167         memset(level_name, 0, 256);
 168         memcpy(level_name, level.begin, min_size_t((size_t)(level.end - level.begin), 255));
 169
 170         if (game_load_level(console->game, level_name) < 0) {
 171             console_log_push_line(console->console_log, "Could not load level", NULL, CONSOLE_ERROR);
 172         }
 173     } else if (token_equals_str(command, "menu")) {
 174         console_log_push_line(console->console_log, "Loading menu", NULL, CONSOLE_FOREGROUND);
 175         game_switch_state(console->game, GAME_STATE_LEVEL_PICKER);
 176     } else {
 177         console_log_push_line(console->console_log, "Unknown command", NULL, CONSOLE_ERROR);
 178     }
 179
 180     edit_field_clean(console->edit_field);
 181
 182     return 0;
 183 }
 184
 185 int console_handle_event(Console *console,
 186                          const SDL_Event *event)
 187 {
 188     switch(event->type) {
 189     case SDL_KEYDOWN: {
 190         switch(event->key.keysym.sym) {
 191         case SDLK_RETURN:
 192             return console_eval_input(console);
 193
 194         case SDLK_UP:
 195             edit_field_replace(
 196                 console->edit_field,
 197                 history_current(console->history));
 198             history_prev(console->history);
 199             return 0;
 200
 201         case SDLK_p: {
 202             if (event->key.keysym.mod & KMOD_CTRL) {
 203                 edit_field_replace(
 204                     console->edit_field, history_current(console->history));
 205                 history_prev(console->history);
 206                 return 0;
 207             }
 208         } break;
 209
 210         case SDLK_DOWN:
 211             edit_field_replace(
 212                 console->edit_field,
 213                 history_current(console->history));
 214             history_next(console->history);
 215             return 0;
 216
 217         case SDLK_n: {
 218             if (event->key.keysym.mod & KMOD_CTRL) {
 219                 edit_field_replace(
 220                     console->edit_field, history_current(console->history));
 221                 history_next(console->history);
 222                 return 0;
 223             }
 224         } break;
 225         }
 226     } break;
 227     }
 228
 229     return edit_field_event(console->edit_field, event);
 230 }
 231
 232 int console_render(const Console *console,
 233                    const Camera *camera)
 234 {
 235     /* TODO(#364): console doesn't have any padding around the edit fields */
 236     SDL_Rect view_port;
 237     SDL_RenderGetViewport(camera->renderer, &view_port);
 238
 239     const float e = console->a * (2 - console->a);
 240     const float y = -(1.0f - e) * CONSOLE_HEIGHT;
 241
 242     if (camera_fill_rect_screen(
 243             camera,
 244             rect(0.0f, y,
 245                  (float) view_port.w,
 246                  CONSOLE_HEIGHT),
 247             CONSOLE_BACKGROUND) < 0) {
 248         return -1;
 249     }
 250
 251     console_log_render(console->console_log,
 252                        camera,
 253                        vec(0.0f, y));
 254
 255     if (edit_field_render_screen(console->edit_field,
 256                                  camera,
 257                                  vec(0.0f, y + CONSOLE_LOG_HEIGHT)) < 0) {
 258         return -1;
 259     }
 260
 261     return 0;
 262 }
 263
 264 int console_update(Console *console, float delta_time)
 265 {
 266     trace_assert(console);
 267
 268     if (console->a < 1.0f) {
 269         console->a += 1.0f / SLIDE_DOWN_TIME * delta_time;
 270
 271         if (console->a > 1.0f) {
 272             console->a = 1.0f;
 273         }
 274     }
 275
 276     return 0;
 277 }
 278
 279 void console_slide_down(Console *console)
 280 {
 281     trace_assert(console);
 282     console->a = 0.0f;
 283 }