src/game/level/platforms.c

   1 #include <SDL.h>
   2 #include "system/stacktrace.h"
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <errno.h>
   7
   8 #include "platforms.h"
   9 #include "system/lt.h"
  10 #include "system/nth_alloc.h"
  11 #include "system/log.h"
  12 #include "game/level/level_editor/rect_layer.h"
  13 #include "math/extrema.h"
  14
  15 struct Platforms {
  16     Lt *lt;
  17
  18     Rect *rects;
  19     Color *colors;
  20     size_t rects_size;
  21 };
  22
  23 Platforms *create_platforms_from_rect_layer(const RectLayer *layer)
  24 {
  25     trace_assert(layer);
  26
  27     Lt *lt = create_lt();
  28
  29     Platforms *platforms = PUSH_LT(
  30         lt,
  31         nth_calloc(1, sizeof(Platforms)),
  32         free);
  33     if (platforms == NULL) {
  34         RETURN_LT(lt, NULL);
  35     }
  36     platforms->lt = lt;
  37
  38     platforms->rects_size = rect_layer_count(layer);
  39
  40     platforms->rects = PUSH_LT(lt, nth_calloc(1, sizeof(Rect) * platforms->rects_size), free);
  41     if (platforms->rects == NULL) {
  42         RETURN_LT(lt, NULL);
  43     }
  44     memcpy(platforms->rects, rect_layer_rects(layer), sizeof(Rect) * platforms->rects_size);
  45
  46
  47     platforms->colors = PUSH_LT(lt, nth_calloc(1, sizeof(Color) * platforms->rects_size), free);
  48     if (platforms->colors == NULL) {
  49         RETURN_LT(lt, NULL);
  50     }
  51     memcpy(platforms->colors, rect_layer_colors(layer), sizeof(Color) * platforms->rects_size);
  52
  53     return platforms;
  54 }
  55
  56 void destroy_platforms(Platforms *platforms)
  57 {
  58     trace_assert(platforms);
  59     RETURN_LT0(platforms->lt);
  60 }
  61
  62 int platforms_render(const Platforms *platforms,
  63                      const Camera *camera)
  64 {
  65     for (size_t i = 0; i < platforms->rects_size; ++i) {
  66         Rect platform_rect = platforms->rects[i];
  67         if (camera_fill_rect(
  68                 camera,
  69                 platform_rect,
  70                 platforms->colors[i]) < 0) {
  71             return -1;
  72         }
  73
  74         char debug_text[256];
  75         snprintf(debug_text, 256,
  76             "id:%zd\n"
  77             "x:%.2f\n"
  78             "y:%.2f\n"
  79             "w:%.2f\n"
  80             "h:%.2f\n",
  81             i, platform_rect.x, platform_rect.y, platform_rect.w, platform_rect.h);
  82
  83         Vec2f text_pos = (Vec2f){.x = platform_rect.x, .y = platform_rect.y};
  84         Rect text_rect = sprite_font_boundary_box(text_pos, vec(2.0f, 2.0f), debug_text);
  85
  86         Rect world_viewport = camera_view_port(camera);
  87         Rect viewport = camera_view_port_screen(camera);
  88
  89         if (rects_overlap(
  90                 camera_rect(
  91                     camera,
  92                     platform_rect),
  93                 viewport) &&
  94             camera_is_point_visible(
  95                 camera,
  96                 text_pos) == false) {
  97             if (platform_rect.w > text_rect.w){
  98                 text_pos.x = fmaxf(fminf(world_viewport.x, platform_rect.x + platform_rect.w - text_rect.w),
  99                                    platform_rect.x);
 100             }
 101             if (platform_rect.h > text_rect.h){
 102                 text_pos.y = fmaxf(fminf(world_viewport.y, platform_rect.y + platform_rect.h - text_rect.h),
 103                                    platform_rect.y);
 104             }
 105         }
 106
 107         if (camera_render_debug_text(
 108                 camera,
 109                 debug_text,
 110                 text_pos) < 0) {
 111             return -1;
 112         }
 113     }
 114
 115     return 0;
 116 }
 117
 118 void platforms_touches_rect_sides(const Platforms *platforms,
 119                                   Rect object,
 120                                   int sides[RECT_SIDE_N])
 121 {
 122     trace_assert(platforms);
 123
 124     for (size_t i = 0; i < platforms->rects_size; ++i) {
 125         rect_object_impact(object, platforms->rects[i], sides);
 126     }
 127 }
 128
 129 Vec2f platforms_snap_rect(const Platforms *platforms,
 130                          Rect *object)
 131 {
 132     trace_assert(platforms);
 133
 134     Vec2f result = vec(1.0f, 1.0f);
 135     for (size_t i = 0; i < platforms->rects_size; ++i) {
 136         if (rects_overlap(platforms->rects[i], *object)) {
 137             // TODO(#1161): can we reuse the Level Editor snapping mechanism in physics snapping
 138             result = vec_entry_mult(result, rect_snap(platforms->rects[i], object));
 139         }
 140     }
 141
 142     return result;
 143 }