Merge pull request #1246 from tsoding/back-platform-secret

[nothing.git] / src / game / level / phantom_platforms.c

diff --git a/src/game/level/phantom_platforms.c b/src/game/level/phantom_platforms.c
new file mode 100644 (file)
index 0000000..bf45c31
--- /dev/null
+++ b/src/game/level/phantom_platforms.c
@@ -0,0 +1,65 @@
+#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(const Phantom_Platforms *pp, const 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 4.0f
+
+// TODO(#1247): phantom_platforms_update is O(N) even when nothing is animated
+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;
+            }
+        }
+    }
+}
+
+// TODO(#1248): phantom_platforms_hide_at is O(N)
+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;
+        }
+    }
+}