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1 // Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // Reference EGL implementation to support EGL sync objects and OpenWF extensions |
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15 |
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16 #include "eglprivate.h" |
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17 |
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18 CEglDisplay::CEglDisplay(RHeap& aHeap): |
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19 iHandle(KEglDefaultDisplayHandle), |
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20 iHeap(aHeap) |
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21 { |
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22 } |
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23 |
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24 CEglDisplay::~CEglDisplay() |
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25 { |
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26 Terminate(); |
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27 |
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28 if (iSyncObjList) |
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29 { |
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30 __ASSERT_DEBUG(iSyncObjList->Count() == 0, User::Panic(KEglPanicCategory, EEglPanicOutstandingSyncObj)); |
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31 |
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32 // we're about to free hash map and its underlying memory, make sure EGL shared heap is used |
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33 RHeap* callerHeap = User::SwitchHeap(&iHeap); |
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34 iSyncObjList->Close(); |
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35 delete iSyncObjList; |
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36 User::SwitchHeap(callerHeap); |
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37 } |
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38 } |
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39 |
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40 TInt CEglDisplay::Initialize() |
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41 { |
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42 TInt err = KErrNone; |
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43 if (iIsInitialized) |
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44 { |
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45 return err; |
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46 } |
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47 |
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48 // hash map is only created once, check that when re-initialising display |
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49 if (iSyncObjList) |
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50 { |
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51 iIsInitialized = ETrue; |
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52 } |
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53 else |
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54 { |
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55 // make sure underlying hash implementation memory is allocated in share heap |
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56 // |
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57 RHeap* callerHeap = User::SwitchHeap(&iHeap); |
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58 iSyncObjList = new REglSyncHashMap; |
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59 if (iSyncObjList) |
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60 { |
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61 iIsInitialized = ETrue; |
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62 } |
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63 else |
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64 { |
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65 err = KErrNoMemory; |
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66 } |
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67 User::SwitchHeap(callerHeap); |
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68 } |
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69 |
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70 return err; |
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71 } |
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72 |
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73 void CEglDisplay::Terminate() |
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74 { |
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75 if (!iIsInitialized) |
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76 { |
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77 return; |
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78 } |
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79 |
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80 REglSyncHashMap::TIter iter(*iSyncObjList); |
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81 // iter begin at index -1, must move it once to get to first item |
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82 while (iter.NextKey()) |
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83 { |
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84 CEglSync** ppSyncObj = iter.CurrentValue(); |
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85 __ASSERT_DEBUG(ppSyncObj, User::Panic(KEglPanicCategory, EEglPanicInvalidSyncObj)); |
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86 |
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87 // In a regular iteration, we should not modify the hash map itself while it is being iterated. |
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88 // However, this is not a regular iteration, we need to remove destroyed object from |
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89 // this hash map without using additional memory e.g. copying destroyed object key temporarily. |
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90 // The reason we do not want to do that is because allocating memory can fail and Terminate |
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91 // must not fail. |
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92 CEglSync* syncObj = *ppSyncObj; |
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93 |
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94 // Destroy() will switch current heap to the EGL shared heap and restore it back. |
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95 // It will also remove the sync object from hash map, but not necessarily delete it (because |
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96 // some other threads may still use it) |
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97 syncObj->Destroy(); |
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98 iter.Reset(); |
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99 } |
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100 |
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101 iIsInitialized = EFalse; |
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102 } |
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103 |
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104 CEglSync* CEglDisplay::FindSyncObj(EGLSyncKHR aObj) const |
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105 { |
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106 __ASSERT_DEBUG(iSyncObjList, User::Panic(KEglPanicCategory, EEglPanicDisplayStateInvalid)); |
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107 |
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108 const TInt key = reinterpret_cast<TInt>(aObj); |
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109 CEglSync** ppso = iSyncObjList->Find(key); |
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110 CEglSync* syncObj = ppso ? *ppso : NULL; |
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111 |
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112 return syncObj; |
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113 } |
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114 |
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115 CEglSync* CEglDisplay::CreateSyncObj() |
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116 { |
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117 __ASSERT_DEBUG(iSyncObjList, User::Panic(KEglPanicCategory, EEglPanicDisplayStateInvalid)); |
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118 |
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119 CEglSync* syncObj = CEglSync::Create(*this); |
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120 |
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121 return syncObj; |
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122 } |
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123 |
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124 TInt CEglDisplay::DestroySyncObj(EGLSyncKHR aSyncObj) |
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125 { |
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126 __ASSERT_DEBUG(iSyncObjList, User::Panic(KEglPanicCategory, EEglPanicDisplayStateInvalid)); |
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127 |
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128 CEglSync* syncObj = reinterpret_cast<CEglSync*>(aSyncObj); |
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129 const TInt key = reinterpret_cast<TInt>(syncObj); |
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130 CEglSync** ppso = iSyncObjList->Find(key); |
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131 if (!ppso) |
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132 { |
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133 return KErrNotFound; |
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134 } |
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135 |
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136 // Destroy() will not delete sync obj or remove it from the list if it is still being used in other threads |
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137 // if there is no more reference to this sync obj when Destroy() is called, it will delete the object and remove it from the list |
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138 __ASSERT_DEBUG(syncObj == *ppso, User::Panic(KEglPanicCategory, EEglPanicInvalidSyncObj)); |
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139 syncObj->Destroy(); |
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140 |
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141 return KErrNone; |
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142 } |
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143 |
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144 TInt CEglDisplay::RegisterSyncObj(CEglSync& aSyncObj) |
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145 { |
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146 __ASSERT_DEBUG(&iHeap == &User::Heap(), User::Panic(KEglPanicCategory, EEglPanicInvalidHeap)); |
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147 __ASSERT_DEBUG(iSyncObjList, User::Panic(KEglPanicCategory, EEglPanicDisplayStateInvalid)); |
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148 |
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149 const TInt key = reinterpret_cast<TInt>(&aSyncObj); |
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150 const TInt err = iSyncObjList->Insert(key, &aSyncObj); |
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151 |
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152 return err; |
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153 } |
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154 |
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155 void CEglDisplay::UnregisterSyncObj(CEglSync& aSyncObj) |
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156 { |
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157 __ASSERT_DEBUG(&iHeap == &User::Heap(), User::Panic(KEglPanicCategory, EEglPanicInvalidHeap)); |
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158 __ASSERT_DEBUG(iSyncObjList, User::Panic(KEglPanicCategory, EEglPanicDisplayStateInvalid)); |
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159 |
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160 const TInt key = reinterpret_cast<TInt>(&aSyncObj); |
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161 const TInt err = iSyncObjList->Remove(key); |
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162 // the only possible error is KErrNotFound which should never happen in our case |
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163 __ASSERT_DEBUG(err == KErrNone, User::Panic(KEglPanicCategory, EEglPanicInvalidSyncObj)); |
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164 } |