103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
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/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 22.06.2018
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*
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* Dynamic variable system
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*
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*/
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// TOP
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internal void
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dynamic_variables_init(Dynamic_Variable_Layout *layout){
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dll_init_sentinel(&layout->sentinel);
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layout->location_counter = 1;
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}
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internal i32
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dynamic_variables_lookup_or_create(General_Memory *general, Dynamic_Variable_Layout *layout,
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String name, u64 default_value){
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for (Dynamic_Variable_Slot *slot = layout->sentinel.next;
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slot != &layout->sentinel;
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slot = slot->next){
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if (match(slot->name, name)){
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return(slot->location);
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}
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}
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int32_t alloc_size = name.size + 1 + sizeof(Dynamic_Variable_Slot);
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void *ptr = general_memory_allocate(general, alloc_size);
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if (ptr != 0){
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Dynamic_Variable_Slot *new_slot = (Dynamic_Variable_Slot*)ptr;
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char *c_str = (char*)(new_slot + 1);
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String str = make_string_cap(c_str, 0, name.size + 1);
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copy(&str, name);
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terminate_with_null(&str);
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new_slot->name = str;
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new_slot->default_value = default_value;
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new_slot->location = layout->location_counter++;
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dll_insert_back(&layout->sentinel, new_slot);
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return(new_slot->location);
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}
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return(0);
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}
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internal void
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dynamic_variables_block_init(General_Memory *general, Dynamic_Variable_Block *block){
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i32 max = 64;
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block->val_array = (u64*)general_memory_allocate(general, sizeof(u64)*max);
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block->count = 0;
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block->max = max;
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}
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internal void
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dynamic_variables_block_free(General_Memory *general, Dynamic_Variable_Block *block){
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general_memory_free(general, block->val_array);
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}
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internal void
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dynamic_variables_block_grow_max_to(General_Memory *general, i32 new_max, Dynamic_Variable_Block *block){
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u64 *new_array = (u64*)general_memory_allocate(general, sizeof(u64)*new_max);
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memcpy(new_array, block->val_array, sizeof(u64)*block->count);
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general_memory_free(general, block->val_array);
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block->val_array = new_array;
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}
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internal void
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dynamic_variables_block_fill_unset_values(Dynamic_Variable_Layout *layout, Dynamic_Variable_Block *block,
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i32 one_past_last_index){
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i32 first_location = block->count + 1;
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i32 one_past_last_location = one_past_last_index + 1;
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block->count = one_past_last_index;
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for (Dynamic_Variable_Slot *slot = layout->sentinel.next;
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slot != &layout->sentinel;
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slot = slot->next){
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if (first_location <= slot->location && slot->location < one_past_last_location){
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block->val_array[slot->location - 1] = slot->default_value;
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}
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}
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}
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internal b32
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dynamic_variables_get_ptr(General_Memory *general,
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Dynamic_Variable_Layout *layout, Dynamic_Variable_Block *block,
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i32 location, u64 **ptr_out){
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b32 result = false;
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if (location > 0 && location < layout->location_counter){
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i32 index = location - 1;
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if (index >= block->count){
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i32 minimum_max = layout->location_counter - 1;
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if (block->max < minimum_max){
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dynamic_variables_block_grow_max_to(general, minimum_max*2, block);
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}
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dynamic_variables_block_fill_unset_values(layout, block, index + 1);
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}
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*ptr_out = block->val_array + index;
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result = true;
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}
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return(result);
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}
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// BOTTOM
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