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 "EglGlobalInfo.h"
18 #include "GLcommon/GLutils.h"
19 #include "GLcommon/TranslatorIfaces.h"
20 #include "ThreadInfo.h"
21 #include <GLES/gl.h>
22 #include <GLES/glext.h>
23
24 namespace ClientAPIExts
25 {
26
27 //
28 // define function pointer type for each extention function
29 // typename has the form __egl_{funcname}_t
30 //
31 #define FUNC_TYPE(fname) __egl_ ## fname ## _t
32 #define API_ENTRY(fname,params,args) \
33 typedef void (GL_APIENTRY *FUNC_TYPE(fname)) params;
34
35 #define API_ENTRY_RET(rtype,fname,params,args) \
36 typedef rtype (GL_APIENTRY *FUNC_TYPE(fname)) params;
37
38 #include "ClientAPIExts.in"
39 #undef API_ENTRY
40 #undef API_ENTRY_RET
41
42 /////
43 // Define static table to store the function value for each
44 // client API. functions pointers will get initialized through
45 // ClientAPIExts::initClientFuncs function after each client API has been
46 // loaded.
47 /////
48 #define API_ENTRY(fname,params,args) \
49 FUNC_TYPE(fname) fname;
50
51 #define API_ENTRY_RET(rtype,fname,params,args) \
52 API_ENTRY(fname,params,args)
53
54 static struct _ext_table
55 {
56 #include "ClientAPIExts.in"
57 } s_client_extensions[MAX_GLES_VERSION-1];
58
59 #undef API_ENTRY
60 #undef API_ENTRY_RET
61
62 //
63 // This function initialized each entry in the s_client_extensions
64 // struct at the givven index using the givven client interface
65 //
initClientFuncs(GLESiface * iface,int idx)66 void initClientFuncs(GLESiface *iface, int idx)
67 {
68 #define API_ENTRY(fname,params,args) \
69 s_client_extensions[idx].fname = \
70 (FUNC_TYPE(fname))iface->getProcAddress(#fname);
71
72 #define API_ENTRY_RET(rtype,fname,params,args) \
73 API_ENTRY(fname,params,args)
74
75 //
76 // reset all func pointers to NULL
77 //
78 memset(&s_client_extensions[idx], 0, sizeof(struct _ext_table));
79
80 //
81 // And now query the GLES library for each proc address
82 //
83 #include "ClientAPIExts.in"
84 #undef API_ENTRY
85 #undef API_ENTRY_RET
86 }
87
88 //
89 // Define implementation for each extension function which checks
90 // the current context version and calls to the correct client API
91 // function.
92 //
93 #define API_ENTRY(fname,params,args) \
94 static void _egl_ ## fname params \
95 { \
96 ThreadInfo* thread = getThreadInfo(); \
97 if (!thread->eglContext.Ptr()) { \
98 return; \
99 } \
100 int idx = (int)thread->eglContext->version() - 1; \
101 if (!s_client_extensions[idx].fname) { \
102 return; \
103 } \
104 (*s_client_extensions[idx].fname) args; \
105 }
106
107 #define API_ENTRY_RET(rtype,fname,params,args) \
108 static rtype _egl_ ## fname params \
109 { \
110 ThreadInfo* thread = getThreadInfo(); \
111 if (!thread->eglContext.Ptr()) { \
112 return (rtype)0; \
113 } \
114 int idx = (int)thread->eglContext->version() - 1; \
115 if (!s_client_extensions[idx].fname) { \
116 return (rtype)0; \
117 } \
118 return (*s_client_extensions[idx].fname) args; \
119 }
120
121 #include "ClientAPIExts.in"
122 #undef API_ENTRY
123 #undef API_ENTRY_RET
124
125 //
126 // Define a table to map function names to the local _egl_ version of
127 // the extension function, to be used in eglGetProcAddress.
128 //
129 #define API_ENTRY(fname,params,args) \
130 { #fname, (__translatorMustCastToProperFunctionPointerType)_egl_ ## fname},
131 #define API_ENTRY_RET(rtype,fname,params,args) \
132 API_ENTRY(fname,params,args)
133
134 static struct _client_ext_funcs {
135 const char *fname;
136 __translatorMustCastToProperFunctionPointerType proc;
137 } s_client_ext_funcs[] = {
138 #include "ClientAPIExts.in"
139 };
140 static const int numExtFuncs = sizeof(s_client_ext_funcs) /
141 sizeof(s_client_ext_funcs[0]);
142
143 #undef API_ENTRY
144 #undef API_ENTRY_RET
145
146 //
147 // returns the __egl_ version of the givven extension function name.
148 //
getProcAddress(const char * fname)149 __translatorMustCastToProperFunctionPointerType getProcAddress(const char *fname)
150 {
151 for (int i=0; i<numExtFuncs; i++) {
152 if (!strcmp(fname, s_client_ext_funcs[i].fname)) {
153 return s_client_ext_funcs[i].proc;
154 }
155 }
156 return NULL;
157 }
158
159 } // of namespace ClientAPIExts
160