src/game/level/phantom_platforms.c

   1 #include "phantom_platforms.h"
   2
   3 Phantom_Platforms create_phantom_platforms(RectLayer *rect_layer)
   4 {
   5     Phantom_Platforms pp;
   6
   7     pp.size = rect_layer->rects.count;
   8     pp.rects = malloc(sizeof(pp.rects[0]) * pp.size);
   9     memcpy(pp.rects, rect_layer->rects.data, sizeof(pp.rects[0]) * pp.size);
  10
  11     pp.colors = malloc(sizeof(pp.colors[0]) * pp.size);
  12     memcpy(pp.colors, rect_layer->colors.data, sizeof(pp.colors[0]) * pp.size);
  13
  14     pp.hiding = calloc(1, sizeof(pp.hiding[0]) * pp.size);
  15
  16     return pp;
  17 }
  18
  19 void destroy_phantom_platforms(Phantom_Platforms pp)
  20 {
  21     free(pp.rects);
  22     free(pp.colors);
  23     free(pp.hiding);
  24 }
  25
  26 void phantom_platforms_render(Phantom_Platforms *pp, Camera *camera)
  27 {
  28     trace_assert(pp);
  29     trace_assert(camera);
  30
  31     for (size_t i = 0; i < pp->size; ++i) {
  32         camera_fill_rect(camera, pp->rects[i], pp->colors[i]);
  33     }
  34 }
  35
  36 #define HIDING_SPEED 2.0f
  37
  38 void phantom_platforms_update(Phantom_Platforms *pp, float dt)
  39 {
  40     trace_assert(pp);
  41
  42     for (size_t i = 0; i < pp->size; ++i) {
  43         if (pp->hiding[i]) {
  44             if (pp->colors[i].a > 0.0f) {
  45                 pp->colors[i].a =
  46                     fmaxf(0.0f, pp->colors[i].a - HIDING_SPEED * dt);
  47             } else {
  48                 pp->hiding[i] = 0;
  49             }
  50         }
  51     }
  52 }
  53
  54 void phantom_platforms_hide_at(Phantom_Platforms *pp, Vec2f position)
  55 {
  56     trace_assert(pp);
  57
  58     for (size_t i = 0; i < pp->size; ++i) {
  59         if (rect_contains_point(pp->rects[i], position)) {
  60             pp->hiding[i] = 1;
  61         }
  62     }
  63 }