create elements?

src/ed_array.h

@@ -23,7 +23,6 @@ void T ## PushArray(array(T) *arr, T value) {\
         arr->data[arr->size] = value;\
         arr->size += 1;\
     } else {\
-        // TODO: resize array
         fprintf(stderr, "failed to push to u8 array, size+num > capacity\n");\
     }\
 };

src/ui.h

@@ -3,6 +3,8 @@
 #ifndef ED_UI_INCLUDED
 #define ED_UI_INCLUDED
 
+#define MAX_UI_ELEMENTS 2048
+
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
@@ -34,7 +36,7 @@ typedef struct {
     ui_axis axis;
     ui_semantic_size semantic_size[2];
     uint32_t computed_size[2];
-    uint32_t computed_pos[2]; 
+    uint32_t computed_pos[2];
 } ui_size;
 
 // UI Element data persisted across frames
@@ -77,18 +79,74 @@ arrayTemplate(ui_element_frame_data);
 typedef struct {
     ed_ht cached_elements;
     array(ui_element_frame_data) frame_elements;
+
+    size_t frame_index;
+
+    size_t current_parent;
 } ui_context;
 
 
 #ifdef ED_UI_IMPLEMENTATION
 
 ui_context init_ui_context() {
-    ed_ht cached_elements = ht_create(32, sizeof(ui_element_cache_data));
+    ed_ht cached_elements = ht_create(MAX_UI_ELEMENTS, sizeof(ui_element_cache_data));
+    array(ui_element_frame_data) frame_elements = newArray(ui_element_frame_data, MAX_UI_ELEMENTS);
 
     return (ui_context) {
         .cached_elements = cached_elements,
+        .frame_elements = frame_elements,
+        .frame_index = 0,
     };
 }
 
+static ui_element_frame_data *_ui_element_last(ui_context *cx, size_t parent_index) {
+    size_t last_index = cx->frame_elements.data[parent_index].last;
+
+    if (last_index) {
+        return &cx->frame_elements.data[last_index];
+    }
+
+    return NULL;
+}
+
+size_t ui_element(ui_context *cx, string label) {
+    ui_element_frame_data frame_data = (ui_element_frame_data) {
+        .index = cx->frame_elements.size,
+        // TODO: don't just set this to label, because then elements
+        // with the same label can't be created together
+        .key = label,
+        .label = label,
+        .first = 0,
+        .last = 0,
+        .next = 0,
+        .prev = cx->frame_elements.data[cx->current_parent].last,
+        .parent = cx->current_parent,
+    };
+
+    // Get cached element data
+    ui_element_cache_data *cache_data = ht_get(&cx->cached_elements, label);
+    if (cache_data) {
+        cache_data->last_instantiated_index = cx->frame_index;
+
+        frame_data.size = cache_data->size;
+    } else {
+        assert("couldn't insert into ui element cache" && ht_set(&cx->cached_elements, label, &(ui_element_cache_data) {
+            .label = label,
+            .size = { 0 },
+            .last_instantiated_index = cx->frame_index,
+        }));
+    }
+
+    pushArray(ui_element_frame_data, &cx->frame_elements, frame_data);
+
+    if (frame_data.prev) {
+        cx->frame_elements.data[frame_data.prev].next = frame_data.index;
+    }
+    if (cx->frame_elements.data[cx->current_parent].first == 0) {
+        cx->frame_elements.data[cx->current_parent].first = frame_data.index;
+    }
+    cx->frame_elements.data[cx->current_parent].last = frame_data.index;
+}
+
 #endif
 #endif