Mercurial > repos > blastem
view arena.c @ 999:238141756e67
Set sprite overflow flag if we completely consume sprite rendering capacity for the line even if there is nothing left to draw. This graphical corruption in the vertical stretching scroll section. Needs hardware confirmation.
author | Michael Pavone <pavone@retrodev.com> |
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date | Sat, 30 Apr 2016 16:19:19 -0700 |
parents | 9f149f0e98b7 |
children | c7c573f0229e |
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/* Copyright 2015 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include <stdlib.h> #include <stdint.h> #include "arena.h" struct arena { void **used_blocks; void **free_blocks; size_t used_count; size_t used_storage; size_t free_count; size_t free_storage; }; static arena *current_arena; arena *get_current_arena() { if (!current_arena) { current_arena = calloc(1, sizeof(arena)); } return current_arena; } arena *set_current_arena(arena *a) { arena *tmp = current_arena; current_arena = a; return tmp; } arena *start_new_arena() { arena *tmp = current_arena; current_arena = NULL; return tmp; } void track_block(void *block) { arena *cur = get_current_arena(); if (cur->used_count == cur->used_storage) { cur->used_storage *= 2; cur->used_blocks = realloc(cur->used_blocks, cur->used_storage * sizeof(void *)); } cur->used_blocks[cur->used_count++] = block; } void mark_all_free() { arena *cur = get_current_arena(); if (!cur->free_blocks) { cur->free_blocks = cur->used_blocks; cur->free_storage = cur->used_storage; cur->free_count = cur->used_count; cur->used_count = cur->used_storage = 0; cur->used_blocks = NULL; } else { if (cur->free_storage < cur->used_count + cur->free_count) { cur->free_storage = cur->used_count + cur->free_count; cur->free_blocks = realloc(cur->free_blocks, cur->free_storage * sizeof(void*)); } for (; cur->used_count > 0; cur->used_count--) { cur->free_blocks[cur->free_count++] = cur->used_blocks[cur->used_count-1]; } } } void *try_alloc_arena() { if (!current_arena || !current_arena->free_count) { return NULL; } return current_arena->free_blocks[--current_arena->free_count]; }