1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #include "ClientAPIExts.h" 17 #include "ThreadInfo.h" 18 #include <GLES/gl.h> 19 #include <GLES/glext.h> 20 #include "eglContext.h" 21 22 namespace ClientAPIExts 23 { 24 25 // 26 // define function pointer type for each extention function 27 // typename has the form __egl_{funcname}_t 28 // 29 #define FUNC_TYPE(fname) __egl_ ## fname ## _t 30 // NOLINT: clang-tidy adds parentheses around 'params'. 31 #define API_ENTRY(fname,params,args) \ 32 typedef void (GL_APIENTRY *FUNC_TYPE(fname)) params; // NOLINT 33 34 #define API_ENTRY_RET(rtype,fname,params,args) \ 35 typedef rtype (GL_APIENTRY *FUNC_TYPE(fname)) params; // NOLINT 36 37 #include "ClientAPIExts.in" 38 #undef API_ENTRY 39 #undef API_ENTRY_RET 40 41 ///// 42 // Define static table to store the function value for each 43 // client API. functions pointers will get initialized through 44 // ClientAPIExts::initClientFuncs function after each client API has been 45 // loaded. 46 ///// 47 #define API_ENTRY(fname,params,args) \ 48 FUNC_TYPE(fname) (fname); 49 50 #define API_ENTRY_RET(rtype,fname,params,args) \ 51 API_ENTRY(fname,params,args) 52 53 static struct _ext_table 54 { 55 #include "ClientAPIExts.in" 56 } s_client_extensions[2]; 57 58 #undef API_ENTRY 59 #undef API_ENTRY_RET 60 61 // 62 // This function initialized each entry in the s_client_extensions 63 // struct at the givven index using the givven client interface 64 // 65 void initClientFuncs(const EGLClient_glesInterface *iface, int idx) 66 { 67 #define API_ENTRY(fname,params,args) \ 68 s_client_extensions[idx].fname = \ 69 (FUNC_TYPE(fname))iface->getProcAddress(#fname); 70 71 #define API_ENTRY_RET(rtype,fname,params,args) \ 72 API_ENTRY(fname,params,args) 73 74 // 75 // reset all func pointers to NULL 76 // 77 memset(&s_client_extensions[idx], 0, sizeof(struct _ext_table)); 78 79 // 80 // And now query the GLES library for each proc address 81 // 82 #include "ClientAPIExts.in" 83 #undef API_ENTRY 84 #undef API_ENTRY_RET 85 } 86 87 // 88 // Define implementation for each extension function which checks 89 // the current context version and calls to the correct client API 90 // function. 91 // 92 // NOLINT: clang-tidy adds parentheses around 'args'. 93 #define API_ENTRY(fname,params,args) \ 94 static void _egl_ ## fname params \ 95 { \ 96 EGLThreadInfo* thread = getEGLThreadInfo(); \ 97 if (!thread->currentContext) { \ 98 return; \ 99 } \ 100 int clientMajorVersion = (int)thread->currentContext->majorVersion; \ 101 int idx = clientMajorVersion == 1 ? 0 : 1; \ 102 if (!s_client_extensions[idx].fname) { \ 103 return; \ 104 } \ 105 (*s_client_extensions[idx].fname) args; /* NOLINT */ \ 106 } 107 108 #define API_ENTRY_RET(rtype,fname,params,args) \ 109 static rtype _egl_ ## fname params \ 110 { \ 111 EGLThreadInfo* thread = getEGLThreadInfo(); \ 112 if (!thread->currentContext) { \ 113 return (rtype)0; \ 114 } \ 115 int idx = (int)thread->currentContext->majorVersion - 1; \ 116 if (!s_client_extensions[idx].fname) { \ 117 return (rtype)0; \ 118 } \ 119 return (*s_client_extensions[idx].fname) args; /* NOLINT */ \ 120 } 121 122 #include "ClientAPIExts.in" 123 #undef API_ENTRY 124 #undef API_ENTRY_RET 125 126 // 127 // Define a table to map function names to the local _egl_ version of 128 // the extension function, to be used in eglGetProcAddress. 129 // 130 #define API_ENTRY(fname,params,args) \ 131 { #fname, (void*)_egl_ ## fname}, 132 #define API_ENTRY_RET(rtype,fname,params,args) \ 133 API_ENTRY(fname,params,args) 134 135 static const struct _client_ext_funcs { 136 const char *fname; 137 void* proc; 138 } s_client_ext_funcs[] = { 139 #include "ClientAPIExts.in" 140 }; 141 static const int numExtFuncs = sizeof(s_client_ext_funcs) / 142 sizeof(s_client_ext_funcs[0]); 143 144 #undef API_ENTRY 145 #undef API_ENTRY_RET 146 147 // 148 // returns the __egl_ version of the givven extension function name. 149 // 150 void* getProcAddress(const char *fname) 151 { 152 for (int i=0; i<numExtFuncs; i++) { 153 if (!strcmp(fname, s_client_ext_funcs[i].fname)) { 154 return s_client_ext_funcs[i].proc; 155 } 156 } 157 return NULL; 158 } 159 160 } // of namespace ClientAPIExts 161