1 /*
2  ** Copyright 2007, 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 
17 #ifndef ANDROID_GLES_CM_HOOKS_H
18 #define ANDROID_GLES_CM_HOOKS_H
19 
20 #include <ctype.h>
21 #include <string.h>
22 #include <errno.h>
23 
24 #include <pthread.h>
25 
26 #include <EGL/egl.h>
27 #include <EGL/eglext.h>
28 #include <GLES/gl.h>
29 #include <GLES/glext.h>
30 #include <GLES2/gl2.h>
31 #include <GLES2/gl2ext.h>
32 #include <GLES3/gl3.h>
33 #include <GLES3/gl31.h>
34 
35 // set to 1 for debugging
36 #define USE_SLOW_BINDING    0
37 
38 #undef NELEM
39 #define NELEM(x)            (sizeof(x)/sizeof(*(x)))
40 
41 // maximum number of GL extensions that can be used simultaneously in
42 // a given process. this limitation exists because we need to have
43 // a static function for each extension and currently these static functions
44 // are generated at compile time.
45 #define MAX_NUMBER_OF_GL_EXTENSIONS 256
46 
47 
48 #include <bionic_tls.h>  /* special private C library header */
49 
50 // ----------------------------------------------------------------------------
51 namespace android {
52 // ----------------------------------------------------------------------------
53 
54 // GL / EGL hooks
55 
56 #undef GL_ENTRY
57 #undef EGL_ENTRY
58 #define GL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
59 #define EGL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
60 
61 struct egl_t {
62     #include "EGL/egl_entries.in"
63 };
64 
65 struct gl_hooks_t {
66     struct gl_t {
67         #include "entries.in"
68     } gl;
69     struct gl_ext_t {
70         __eglMustCastToProperFunctionPointerType extensions[MAX_NUMBER_OF_GL_EXTENSIONS];
71     } ext;
72 };
73 #undef GL_ENTRY
74 #undef EGL_ENTRY
75 
76 EGLAPI void setGlThreadSpecific(gl_hooks_t const *value);
77 
78 // We have a dedicated TLS slot in bionic
get_tls_hooks()79 inline gl_hooks_t const * volatile * get_tls_hooks() {
80     volatile void *tls_base = __get_tls();
81     gl_hooks_t const * volatile * tls_hooks =
82             reinterpret_cast<gl_hooks_t const * volatile *>(tls_base);
83     return tls_hooks;
84 }
85 
getGlThreadSpecific()86 inline EGLAPI gl_hooks_t const* getGlThreadSpecific() {
87     gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
88     gl_hooks_t const* hooks = tls_hooks[TLS_SLOT_OPENGL_API];
89     return hooks;
90 }
91 
92 // ----------------------------------------------------------------------------
93 }; // namespace android
94 // ----------------------------------------------------------------------------
95 
96 #endif /* ANDROID_GLES_CM_HOOKS_H */
97