1 /*
2  ** Copyright 2009, 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_EGL_LOADER_H
18 #define ANDROID_EGL_LOADER_H
19 
20 #include <stdint.h>
21 
22 #include <EGL/egl.h>
23 
24 // ----------------------------------------------------------------------------
25 namespace android {
26 // ----------------------------------------------------------------------------
27 
28 struct egl_connection_t;
29 
30 class Loader {
31     typedef __eglMustCastToProperFunctionPointerType (* getProcAddressType)(const char*);
32 
33     enum {
34         EGL         = 0x01,
35         GLESv1_CM   = 0x02,
36         GLESv2      = 0x04,
37         PLATFORM    = 0x08
38     };
39     struct driver_t {
40         explicit driver_t(void* gles);
41         ~driver_t();
42         // returns -errno
43         int set(void* hnd, int32_t api);
44         void* dso[3];
45     };
46 
47     getProcAddressType getProcAddress;
48 
49 public:
50     static Loader& getInstance();
51     ~Loader();
52 
53     void* open(egl_connection_t* cnx);
54     void close(egl_connection_t* cnx);
55 
56 private:
57     Loader();
58     driver_t* attempt_to_load_angle(egl_connection_t* cnx);
59     driver_t* attempt_to_load_updated_driver(egl_connection_t* cnx);
60     driver_t* attempt_to_load_system_driver(egl_connection_t* cnx, const char* suffix, const bool exact);
61     void unload_system_driver(egl_connection_t* cnx);
62     void initialize_api(void* dso, egl_connection_t* cnx, uint32_t mask);
63     void init_angle_backend(void* dso, egl_connection_t* cnx);
64 
65     static __attribute__((noinline))
66     void init_api(void* dso,
67             char const * const * api,
68             char const * const * ref_api,
69             __eglMustCastToProperFunctionPointerType* curr,
70             getProcAddressType getProcAddress);
71 };
72 
73 // ----------------------------------------------------------------------------
74 }; // namespace android
75 // ----------------------------------------------------------------------------
76 
77 #endif /* ANDROID_EGL_LOADER_H */
78