Introduce Phantom Platforms

assets/levels/level-02.txt

@@ -42,3 +42,7 @@ box_1 -609.278137 -667.919678 112.500031 107.291695 9aa034
 box_0 -3923.780518 452.429810 112.500031 107.291695 a05034
 0
 0
+3
+pp_0 -104.841812 -42.929047 55.225319 53.499516 ff0000
+pp_1 30.632792 -131.375824 56.951111 62.559914 ff0000
+pp_2 59.539791 -29.554169 44.870571 75.071899 ff0000

nothing.c

@@ -49,3 +49,4 @@
 #include "src/dynarray.c"
 #include "src/system/file.c"
 #include "src/ring_buffer.c"
+#include "src/game/level/phantom_platforms.h"

src/game/level/level_editor.c

@@ -50,6 +50,7 @@ LevelEditor *create_level_editor(Memory *memory, Cursor *cursor)
     level_editor->regions_layer = create_rect_layer(memory, "region", cursor);
     level_editor->goals_layer = create_point_layer(memory, "goal");
     level_editor->label_layer = create_label_layer(memory, "label");
+    level_editor->pp_layer = create_rect_layer(memory, "pp", cursor);
 
     level_editor->layers[LAYER_PICKER_BOXES] = rect_layer_as_layer(level_editor->boxes_layer);
     level_editor->layers[LAYER_PICKER_PLATFORMS] = rect_layer_as_layer(level_editor->platforms_layer);
@@ -60,6 +61,7 @@ LevelEditor *create_level_editor(Memory *memory, Cursor *cursor)
     level_editor->layers[LAYER_PICKER_REGIONS] = rect_layer_as_layer(level_editor->regions_layer);
     level_editor->layers[LAYER_PICKER_BACKGROUND] = background_layer_as_layer(&level_editor->background_layer);
     level_editor->layers[LAYER_PICKER_LABELS] = label_layer_as_layer(level_editor->label_layer);
+    level_editor->layers[LAYER_PICKER_PP] = rect_layer_as_layer(level_editor->pp_layer);
 
 
     level_editor->notice = (FadingWigglyText) {
@@ -363,7 +365,8 @@ static LayerPicker level_format_layer_order[LAYER_PICKER_N] = {
     LAYER_PICKER_BACK_PLATFORMS,
     LAYER_PICKER_BOXES,
     LAYER_PICKER_LABELS,
-    LAYER_PICKER_REGIONS
+    LAYER_PICKER_REGIONS,
+    LAYER_PICKER_PP
 };
 
 /* TODO(#904): LevelEditor does not check that the saved level file is modified by external program */

src/game/level/level_editor.h

@@ -36,6 +36,7 @@ struct LevelEditor
     RectLayer *regions_layer;
     BackgroundLayer background_layer;
     LabelLayer *label_layer;
+    RectLayer *pp_layer;
 
     LayerPtr layers[LAYER_PICKER_N];
 

src/game/level/level_editor/layer_picker.c

@@ -25,6 +25,7 @@ static const Color LAYER_CELL_BACKGROUND_COLORS[LAYER_PICKER_N] = {
     {0.2f, 1.0f, 0.6f, 1.0f}, // LAYER_PICKER_BOXES
     {0.2f, 0.6f, 1.0f, 1.0f}, // LAYER_PICKER_LABELS
     {0.2f, 1.0f, 0.6f, 1.0f}, // LAYER_PICKER_REGIONS
+    {0.2f, 1.0f, 0.6f, 1.0f}, // LAYER_PICKER_PP
 };
 
 static const char *LAYER_CELL_TITLES[LAYER_PICKER_N] = {
@@ -37,6 +38,7 @@ static const char *LAYER_CELL_TITLES[LAYER_PICKER_N] = {
     "Boxes",                   // LAYER_PICKER_BOXES
     "Labels",                  // LAYER_PICKER_LABELS
     "Regions",                 // LAYER_PICKER_REGIONS
+    "Phantom Platforms",       // LAYER_PICKER_PP
 };
 
 inline static float layer_picker_max_width(void)

src/game/level/level_editor/layer_picker.h

@@ -15,6 +15,7 @@ typedef enum {
     LAYER_PICKER_BOXES,
     LAYER_PICKER_LABELS,
     LAYER_PICKER_REGIONS,
+    LAYER_PICKER_PP,
 
     LAYER_PICKER_N
 } LayerPicker;

src/game/level/phantom_platforms.c

@@ -0,0 +1,63 @@
+#include "phantom_platforms.h"
+
+Phantom_Platforms create_phantom_platforms(RectLayer *rect_layer)
+{
+    Phantom_Platforms pp;
+
+    pp.size = rect_layer->rects.count;
+    pp.rects = malloc(sizeof(pp.rects[0]) * pp.size);
+    memcpy(pp.rects, rect_layer->rects.data, sizeof(pp.rects[0]) * pp.size);
+
+    pp.colors = malloc(sizeof(pp.colors[0]) * pp.size);
+    memcpy(pp.colors, rect_layer->colors.data, sizeof(pp.colors[0]) * pp.size);
+
+    pp.hiding = calloc(1, sizeof(pp.hiding[0]) * pp.size);
+
+    return pp;
+}
+
+void destroy_phantom_platforms(Phantom_Platforms pp)
+{
+    free(pp.rects);
+    free(pp.colors);
+    free(pp.hiding);
+}
+
+void phantom_platforms_render(Phantom_Platforms *pp, Camera *camera)
+{
+    trace_assert(pp);
+    trace_assert(camera);
+
+    for (size_t i = 0; i < pp->size; ++i) {
+        camera_fill_rect(camera, pp->rects[i], pp->colors[i]);
+    }
+}
+
+#define HIDING_SPEED 2.0f
+
+void phantom_platforms_update(Phantom_Platforms *pp, float dt)
+{
+    trace_assert(pp);
+
+    for (size_t i = 0; i < pp->size; ++i) {
+        if (pp->hiding[i]) {
+            if (pp->colors[i].a > 0.0f) {
+                pp->colors[i].a =
+                    fmaxf(0.0f, pp->colors[i].a - HIDING_SPEED * dt);
+            } else {
+                pp->hiding[i] = 0;
+            }
+        }
+    }
+}
+
+void phantom_platforms_hide_at(Phantom_Platforms *pp, Vec2f position)
+{
+    trace_assert(pp);
+
+    for (size_t i = 0; i < pp->size; ++i) {
+        if (rect_contains_point(pp->rects[i], position)) {
+            pp->hiding[i] = 1;
+        }
+    }
+}

src/game/level/phantom_platforms.h

@@ -0,0 +1,18 @@
+#ifndef PHANTOM_PLATFORMS_H_
+#define PHANTOM_PLATFORMS_H_
+
+typedef struct {
+    size_t size;
+    Rect *rects;
+    Color *colors;
+    int *hiding;
+} Phantom_Platforms;
+
+Phantom_Platforms create_phantom_platforms(RectLayer *rect_layer);
+void destroy_phantom_platforms(Phantom_Platforms pp);
+
+void phantom_platforms_render(Phantom_Platforms *pp, Camera *camera);
+void phantom_platforms_update(Phantom_Platforms *pp, float dt);
+void phantom_platforms_hide_at(Phantom_Platforms *pp, Vec2f position);
+
+#endif  // PHANTOM_PLATFORMS_H_