Mercurial > repos > blastem
annotate arena.c @ 922:913a6336ce20
Shift slot number to slot behavior mapping by six slots in H40 mode. This makes the line change slot align with the point at which the display turns on and off at the end of the active display area. Also fixed a regression in which an external slot got accidentally changed into a sprite draw slot
author | Michael Pavone <pavone@retrodev.com> |
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date | Thu, 28 Jan 2016 09:10:14 -0800 |
parents | 9f149f0e98b7 |
children | c7c573f0229e |
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883
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1 /* |
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2 Copyright 2015 Michael Pavone |
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3 This file is part of BlastEm. |
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. |
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5 */ |
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6 #include <stdlib.h> |
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7 #include <stdint.h> |
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8 #include "arena.h" |
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9 |
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10 struct arena { |
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11 void **used_blocks; |
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12 void **free_blocks; |
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13 |
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14 size_t used_count; |
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15 size_t used_storage; |
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16 size_t free_count; |
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17 size_t free_storage; |
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18 }; |
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19 |
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20 static arena *current_arena; |
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21 |
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22 arena *get_current_arena() |
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23 { |
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24 if (!current_arena) { |
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25 current_arena = calloc(1, sizeof(arena)); |
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26 } |
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27 return current_arena; |
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28 } |
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29 |
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30 arena *set_current_arena(arena *a) |
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31 { |
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32 arena *tmp = current_arena; |
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33 current_arena = a; |
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34 return tmp; |
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35 } |
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36 |
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37 arena *start_new_arena() |
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38 { |
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39 arena *tmp = current_arena; |
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40 current_arena = NULL; |
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41 return tmp; |
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42 } |
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43 |
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44 void track_block(void *block) |
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45 { |
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46 arena *cur = get_current_arena(); |
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47 if (cur->used_count == cur->used_storage) { |
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48 cur->used_storage *= 2; |
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49 cur->used_blocks = realloc(cur->used_blocks, cur->used_storage * sizeof(void *)); |
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50 } |
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51 cur->used_blocks[cur->used_count++] = block; |
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52 } |
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53 |
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54 void mark_all_free() |
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55 { |
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56 arena *cur = get_current_arena(); |
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57 if (!cur->free_blocks) { |
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58 cur->free_blocks = cur->used_blocks; |
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59 cur->free_storage = cur->used_storage; |
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60 cur->free_count = cur->used_count; |
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61 cur->used_count = cur->used_storage = 0; |
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62 cur->used_blocks = NULL; |
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63 } else { |
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64 if (cur->free_storage < cur->used_count + cur->free_count) { |
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65 cur->free_storage = cur->used_count + cur->free_count; |
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66 cur->free_blocks = realloc(cur->free_blocks, cur->free_storage * sizeof(void*)); |
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67 } |
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68 for (; cur->used_count > 0; cur->used_count--) |
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69 { |
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70 cur->free_blocks[cur->free_count++] = cur->used_blocks[cur->used_count-1]; |
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71 } |
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72 } |
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73 } |
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74 |
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75 void *try_alloc_arena() |
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76 { |
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77 if (!current_arena || !current_arena->free_count) { |
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78 return NULL; |
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79 } |
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80 return current_arena->free_blocks[--current_arena->free_count]; |
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81 } |