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      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 <ctype.h>
     21 #include <string.h>
     22 #include <errno.h>
     23 
     24 #include <utils/Errors.h>
     25 #include <utils/Singleton.h>
     26 #include <utils/String8.h>
     27 
     28 #include <EGL/egl.h>
     29 
     30 // ----------------------------------------------------------------------------
     31 namespace android {
     32 // ----------------------------------------------------------------------------
     33 
     34 struct egl_connection_t;
     35 
     36 class Loader : public Singleton<Loader>
     37 {
     38     friend class Singleton<Loader>;
     39 
     40     typedef __eglMustCastToProperFunctionPointerType (*getProcAddressType)(
     41             const char*);
     42 
     43     enum {
     44         EGL         = 0x01,
     45         GLESv1_CM   = 0x02,
     46         GLESv2      = 0x04
     47     };
     48     struct driver_t {
     49         driver_t(void* gles);
     50         ~driver_t();
     51         status_t set(void* hnd, int32_t api);
     52         void* dso[3];
     53     };
     54 
     55     String8 mDriverTag;
     56     getProcAddressType getProcAddress;
     57 
     58 public:
     59     ~Loader();
     60 
     61     void* open(egl_connection_t* cnx);
     62     status_t close(void* driver);
     63 
     64 private:
     65     Loader();
     66     void *load_driver(const char* kind, const char *tag, egl_connection_t* cnx, uint32_t mask);
     67 
     68     static __attribute__((noinline))
     69     void init_api(void* dso,
     70             char const * const * api,
     71             __eglMustCastToProperFunctionPointerType* curr,
     72             getProcAddressType getProcAddress);
     73 };
     74 
     75 // ----------------------------------------------------------------------------
     76 }; // namespace android
     77 // ----------------------------------------------------------------------------
     78 
     79 #endif /* ANDROID_EGL_LOADER_H */
     80