src/game/level/lava.c

   1 #include <SDL2/SDL.h>
   2 #include "system/stacktrace.h"
   3 #include <stdio.h>
   4
   5 #include "color.h"
   6 #include "game/level/lava/wavy_rect.h"
   7 #include "lava.h"
   8 #include "math/rect.h"
   9 #include "system/lt.h"
  10 #include "system/line_stream.h"
  11 #include "system/nth_alloc.h"
  12 #include "system/log.h"
  13
  14 #define LAVA_BOINGNESS 2500.0f
  15
  16 struct Lava {
  17     Lt lt;
  18     size_t rects_count;
  19     Wavy_rect **rects;
  20 };
  21
  22 Lava *create_lava_from_line_stream(LineStream *line_stream)
  23 {
  24     trace_assert(line_stream);
  25
  26     Lt lt = {0};
  27
  28     Lava *lava = PUSH_LT(lt, nth_calloc(1, sizeof(Lava)), free);
  29     if (lava == NULL) {
  30         RETURN_LT(lt, NULL);
  31     }
  32
  33     if (sscanf(
  34             line_stream_next(line_stream),
  35             "%lu",
  36             &lava->rects_count) < 0) {
  37         log_fail("Could not read amount of lavas\n");
  38         RETURN_LT(lt, NULL);
  39     }
  40
  41     lava->rects = PUSH_LT(lt, nth_calloc(1, sizeof(Wavy_rect*) * lava->rects_count), free);
  42     if (lava->rects == NULL) {
  43         RETURN_LT(lt, NULL);
  44     }
  45
  46     for (size_t i = 0; i < lava->rects_count; ++i) {
  47         lava->rects[i] = PUSH_LT(lt, create_wavy_rect_from_line_stream(line_stream), destroy_wavy_rect);
  48         if (lava->rects[i] == NULL) {
  49             RETURN_LT(lt, NULL);
  50         }
  51     }
  52
  53     lava->lt = lt;
  54
  55     return lava;
  56 }
  57
  58 void destroy_lava(Lava *lava)
  59 {
  60     trace_assert(lava);
  61     RETURN_LT0(lava->lt);
  62 }
  63
  64 /* TODO(#449): lava does not render its id in debug mode */
  65 int lava_render(const Lava *lava,
  66                 Camera *camera)
  67 {
  68     trace_assert(lava);
  69     trace_assert(camera);
  70
  71     for (size_t i = 0; i < lava->rects_count; ++i) {
  72         if (wavy_rect_render(lava->rects[i], camera) < 0) {
  73             return -1;
  74         }
  75     }
  76
  77     return 0;
  78 }
  79
  80 int lava_update(Lava *lava, float delta_time)
  81 {
  82     trace_assert(lava);
  83
  84     for (size_t i = 0; i < lava->rects_count; ++i) {
  85         if (wavy_rect_update(lava->rects[i], delta_time) < 0) {
  86             return -1;
  87         }
  88     }
  89
  90     return 0;
  91 }
  92
  93 bool lava_overlaps_rect(const Lava *lava,
  94                         Rect rect)
  95 {
  96     trace_assert(lava);
  97
  98     for (size_t i = 0; i < lava->rects_count; ++i) {
  99         if (rects_overlap(wavy_rect_hitbox(lava->rects[i]), rect)) {
 100             return true;
 101         }
 102     }
 103
 104     return 0;
 105 }
 106
 107 void lava_float_rigid_body(Lava *lava, RigidBodies *rigid_bodies, RigidBodyId id)
 108 {
 109     trace_assert(lava);
 110
 111     const Rect object_hitbox = rigid_bodies_hitbox(rigid_bodies, id);
 112     for (size_t i = 0; i < lava->rects_count; ++i) {
 113         const Rect lava_hitbox = wavy_rect_hitbox(lava->rects[i]);
 114         if (rects_overlap(object_hitbox, lava_hitbox)) {
 115             const Rect overlap_area = rects_overlap_area(object_hitbox, lava_hitbox);
 116             const float k = overlap_area.w * overlap_area.h / (object_hitbox.w * object_hitbox.h);
 117             rigid_bodies_apply_force(
 118                 rigid_bodies,
 119                 id,
 120                 vec(0.0f, -k * LAVA_BOINGNESS));
 121             rigid_bodies_damper(rigid_bodies, id, vec(0.0f, -0.9f));
 122         }
 123     }
 124 }