opengl/libs/EGL/Loader.h

/*
 ** Copyright 2009, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 **
 **     http://www.apache.org/licenses/LICENSE-2.0
 **
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 */

#ifndef ANDROID_EGL_LOADER_H
#define ANDROID_EGL_LOADER_H

#include <EGL/egl.h>
#include <stdint.h>

namespace android {

struct egl_connection_t;

class Loader {
    typedef __eglMustCastToProperFunctionPointerType (* getProcAddressType)(const char*);

    enum {
        EGL         = 0x01,
        GLESv1_CM   = 0x02,
        GLESv2      = 0x04,
        PLATFORM    = 0x08
    };
    struct driver_t {
        explicit driver_t(void* gles);
        ~driver_t();
        // returns -errno
        int set(void* hnd, int32_t api);
        void* dso[3];
    };

    getProcAddressType getProcAddress;

public:
    static Loader& getInstance();
    ~Loader();

    void* open(egl_connection_t* cnx);
    void close(egl_connection_t* cnx);

private:
    Loader();
    driver_t* attempt_to_load_angle(egl_connection_t* cnx);
    driver_t* attempt_to_load_updated_driver(egl_connection_t* cnx);
    driver_t* attempt_to_load_system_driver(egl_connection_t* cnx, const char* suffix, const bool exact);
    void unload_system_driver(egl_connection_t* cnx);
    void initialize_api(void* dso, egl_connection_t* cnx, uint32_t mask);
    void attempt_to_init_angle_backend(void* dso, egl_connection_t* cnx);

    static __attribute__((noinline)) void init_api(void* dso, const char* const* api,
                                                   const char* const* ref_api,
                                                   __eglMustCastToProperFunctionPointerType* curr,
                                                   getProcAddressType getProcAddress);
};

}; // namespace android

#endif /* ANDROID_EGL_LOADER_H */