/**
 * SPDX-License-Identifier: (WTFPL OR CC0-1.0) AND Apache-2.0
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glad/egl.h>

#ifndef GLAD_IMPL_UTIL_C_
#define GLAD_IMPL_UTIL_C_

#ifdef _MSC_VER
#define GLAD_IMPL_UTIL_SSCANF sscanf_s
#else
#define GLAD_IMPL_UTIL_SSCANF sscanf
#endif

#endif /* GLAD_IMPL_UTIL_C_ */

#ifdef __cplusplus
extern "C" {
#endif


int GLAD_EGL_VERSION_1_0 = 0;
int GLAD_EGL_VERSION_1_1 = 0;
int GLAD_EGL_VERSION_1_2 = 0;
int GLAD_EGL_VERSION_1_3 = 0;
int GLAD_EGL_VERSION_1_4 = 0;
int GLAD_EGL_VERSION_1_5 = 0;


PFNEGLBINDAPIPROC glad_eglBindAPI = NULL;
PFNEGLBINDTEXIMAGEPROC glad_eglBindTexImage = NULL;
PFNEGLCHOOSECONFIGPROC glad_eglChooseConfig = NULL;
PFNEGLCLIENTWAITSYNCPROC glad_eglClientWaitSync = NULL;
PFNEGLCOPYBUFFERSPROC glad_eglCopyBuffers = NULL;
PFNEGLCREATECONTEXTPROC glad_eglCreateContext = NULL;
PFNEGLCREATEIMAGEPROC glad_eglCreateImage = NULL;
PFNEGLCREATEPBUFFERFROMCLIENTBUFFERPROC glad_eglCreatePbufferFromClientBuffer = NULL;
PFNEGLCREATEPBUFFERSURFACEPROC glad_eglCreatePbufferSurface = NULL;
PFNEGLCREATEPIXMAPSURFACEPROC glad_eglCreatePixmapSurface = NULL;
PFNEGLCREATEPLATFORMPIXMAPSURFACEPROC glad_eglCreatePlatformPixmapSurface = NULL;
PFNEGLCREATEPLATFORMWINDOWSURFACEPROC glad_eglCreatePlatformWindowSurface = NULL;
PFNEGLCREATESYNCPROC glad_eglCreateSync = NULL;
PFNEGLCREATEWINDOWSURFACEPROC glad_eglCreateWindowSurface = NULL;
PFNEGLDESTROYCONTEXTPROC glad_eglDestroyContext = NULL;
PFNEGLDESTROYIMAGEPROC glad_eglDestroyImage = NULL;
PFNEGLDESTROYSURFACEPROC glad_eglDestroySurface = NULL;
PFNEGLDESTROYSYNCPROC glad_eglDestroySync = NULL;
PFNEGLGETCONFIGATTRIBPROC glad_eglGetConfigAttrib = NULL;
PFNEGLGETCONFIGSPROC glad_eglGetConfigs = NULL;
PFNEGLGETCURRENTCONTEXTPROC glad_eglGetCurrentContext = NULL;
PFNEGLGETCURRENTDISPLAYPROC glad_eglGetCurrentDisplay = NULL;
PFNEGLGETCURRENTSURFACEPROC glad_eglGetCurrentSurface = NULL;
PFNEGLGETDISPLAYPROC glad_eglGetDisplay = NULL;
PFNEGLGETERRORPROC glad_eglGetError = NULL;
PFNEGLGETPLATFORMDISPLAYPROC glad_eglGetPlatformDisplay = NULL;
PFNEGLGETPROCADDRESSPROC glad_eglGetProcAddress = NULL;
PFNEGLGETSYNCATTRIBPROC glad_eglGetSyncAttrib = NULL;
PFNEGLINITIALIZEPROC glad_eglInitialize = NULL;
PFNEGLMAKECURRENTPROC glad_eglMakeCurrent = NULL;
PFNEGLQUERYAPIPROC glad_eglQueryAPI = NULL;
PFNEGLQUERYCONTEXTPROC glad_eglQueryContext = NULL;
PFNEGLQUERYSTRINGPROC glad_eglQueryString = NULL;
PFNEGLQUERYSURFACEPROC glad_eglQuerySurface = NULL;
PFNEGLRELEASETEXIMAGEPROC glad_eglReleaseTexImage = NULL;
PFNEGLRELEASETHREADPROC glad_eglReleaseThread = NULL;
PFNEGLSURFACEATTRIBPROC glad_eglSurfaceAttrib = NULL;
PFNEGLSWAPBUFFERSPROC glad_eglSwapBuffers = NULL;
PFNEGLSWAPINTERVALPROC glad_eglSwapInterval = NULL;
PFNEGLTERMINATEPROC glad_eglTerminate = NULL;
PFNEGLWAITCLIENTPROC glad_eglWaitClient = NULL;
PFNEGLWAITGLPROC glad_eglWaitGL = NULL;
PFNEGLWAITNATIVEPROC glad_eglWaitNative = NULL;
PFNEGLWAITSYNCPROC glad_eglWaitSync = NULL;


static void glad_egl_load_EGL_VERSION_1_0( GLADuserptrloadfunc load, void* userptr) {
    if(!GLAD_EGL_VERSION_1_0) return;
    glad_eglChooseConfig = (PFNEGLCHOOSECONFIGPROC) load(userptr, "eglChooseConfig");
    glad_eglCopyBuffers = (PFNEGLCOPYBUFFERSPROC) load(userptr, "eglCopyBuffers");
    glad_eglCreateContext = (PFNEGLCREATECONTEXTPROC) load(userptr, "eglCreateContext");
    glad_eglCreatePbufferSurface = (PFNEGLCREATEPBUFFERSURFACEPROC) load(userptr, "eglCreatePbufferSurface");
    glad_eglCreatePixmapSurface = (PFNEGLCREATEPIXMAPSURFACEPROC) load(userptr, "eglCreatePixmapSurface");
    glad_eglCreateWindowSurface = (PFNEGLCREATEWINDOWSURFACEPROC) load(userptr, "eglCreateWindowSurface");
    glad_eglDestroyContext = (PFNEGLDESTROYCONTEXTPROC) load(userptr, "eglDestroyContext");
    glad_eglDestroySurface = (PFNEGLDESTROYSURFACEPROC) load(userptr, "eglDestroySurface");
    glad_eglGetConfigAttrib = (PFNEGLGETCONFIGATTRIBPROC) load(userptr, "eglGetConfigAttrib");
    glad_eglGetConfigs = (PFNEGLGETCONFIGSPROC) load(userptr, "eglGetConfigs");
    glad_eglGetCurrentDisplay = (PFNEGLGETCURRENTDISPLAYPROC) load(userptr, "eglGetCurrentDisplay");
    glad_eglGetCurrentSurface = (PFNEGLGETCURRENTSURFACEPROC) load(userptr, "eglGetCurrentSurface");
    glad_eglGetDisplay = (PFNEGLGETDISPLAYPROC) load(userptr, "eglGetDisplay");
    glad_eglGetError = (PFNEGLGETERRORPROC) load(userptr, "eglGetError");
    glad_eglGetProcAddress = (PFNEGLGETPROCADDRESSPROC) load(userptr, "eglGetProcAddress");
    glad_eglInitialize = (PFNEGLINITIALIZEPROC) load(userptr, "eglInitialize");
    glad_eglMakeCurrent = (PFNEGLMAKECURRENTPROC) load(userptr, "eglMakeCurrent");
    glad_eglQueryContext = (PFNEGLQUERYCONTEXTPROC) load(userptr, "eglQueryContext");
    glad_eglQueryString = (PFNEGLQUERYSTRINGPROC) load(userptr, "eglQueryString");
    glad_eglQuerySurface = (PFNEGLQUERYSURFACEPROC) load(userptr, "eglQuerySurface");
    glad_eglSwapBuffers = (PFNEGLSWAPBUFFERSPROC) load(userptr, "eglSwapBuffers");
    glad_eglTerminate = (PFNEGLTERMINATEPROC) load(userptr, "eglTerminate");
    glad_eglWaitGL = (PFNEGLWAITGLPROC) load(userptr, "eglWaitGL");
    glad_eglWaitNative = (PFNEGLWAITNATIVEPROC) load(userptr, "eglWaitNative");
}
static void glad_egl_load_EGL_VERSION_1_1( GLADuserptrloadfunc load, void* userptr) {
    if(!GLAD_EGL_VERSION_1_1) return;
    glad_eglBindTexImage = (PFNEGLBINDTEXIMAGEPROC) load(userptr, "eglBindTexImage");
    glad_eglReleaseTexImage = (PFNEGLRELEASETEXIMAGEPROC) load(userptr, "eglReleaseTexImage");
    glad_eglSurfaceAttrib = (PFNEGLSURFACEATTRIBPROC) load(userptr, "eglSurfaceAttrib");
    glad_eglSwapInterval = (PFNEGLSWAPINTERVALPROC) load(userptr, "eglSwapInterval");
}
static void glad_egl_load_EGL_VERSION_1_2( GLADuserptrloadfunc load, void* userptr) {
    if(!GLAD_EGL_VERSION_1_2) return;
    glad_eglBindAPI = (PFNEGLBINDAPIPROC) load(userptr, "eglBindAPI");
    glad_eglCreatePbufferFromClientBuffer = (PFNEGLCREATEPBUFFERFROMCLIENTBUFFERPROC) load(userptr, "eglCreatePbufferFromClientBuffer");
    glad_eglQueryAPI = (PFNEGLQUERYAPIPROC) load(userptr, "eglQueryAPI");
    glad_eglReleaseThread = (PFNEGLRELEASETHREADPROC) load(userptr, "eglReleaseThread");
    glad_eglWaitClient = (PFNEGLWAITCLIENTPROC) load(userptr, "eglWaitClient");
}
static void glad_egl_load_EGL_VERSION_1_4( GLADuserptrloadfunc load, void* userptr) {
    if(!GLAD_EGL_VERSION_1_4) return;
    glad_eglGetCurrentContext = (PFNEGLGETCURRENTCONTEXTPROC) load(userptr, "eglGetCurrentContext");
}
static void glad_egl_load_EGL_VERSION_1_5( GLADuserptrloadfunc load, void* userptr) {
    if(!GLAD_EGL_VERSION_1_5) return;
    glad_eglClientWaitSync = (PFNEGLCLIENTWAITSYNCPROC) load(userptr, "eglClientWaitSync");
    glad_eglCreateImage = (PFNEGLCREATEIMAGEPROC) load(userptr, "eglCreateImage");
    glad_eglCreatePlatformPixmapSurface = (PFNEGLCREATEPLATFORMPIXMAPSURFACEPROC) load(userptr, "eglCreatePlatformPixmapSurface");
    glad_eglCreatePlatformWindowSurface = (PFNEGLCREATEPLATFORMWINDOWSURFACEPROC) load(userptr, "eglCreatePlatformWindowSurface");
    glad_eglCreateSync = (PFNEGLCREATESYNCPROC) load(userptr, "eglCreateSync");
    glad_eglDestroyImage = (PFNEGLDESTROYIMAGEPROC) load(userptr, "eglDestroyImage");
    glad_eglDestroySync = (PFNEGLDESTROYSYNCPROC) load(userptr, "eglDestroySync");
    glad_eglGetPlatformDisplay = (PFNEGLGETPLATFORMDISPLAYPROC) load(userptr, "eglGetPlatformDisplay");
    glad_eglGetSyncAttrib = (PFNEGLGETSYNCATTRIBPROC) load(userptr, "eglGetSyncAttrib");
    glad_eglWaitSync = (PFNEGLWAITSYNCPROC) load(userptr, "eglWaitSync");
}


static int glad_egl_get_extensions(EGLDisplay display, const char **extensions) {
    *extensions = eglQueryString(display, EGL_EXTENSIONS);

    return extensions != NULL;
}

static int glad_egl_has_extension(const char *extensions, const char *ext) {
    const char *loc;
    const char *terminator;
    if(extensions == NULL) {
        return 0;
    }
    while(1) {
        loc = strstr(extensions, ext);
        if(loc == NULL) {
            return 0;
        }
        terminator = loc + strlen(ext);
        if((loc == extensions || *(loc - 1) == ' ') &&
            (*terminator == ' ' || *terminator == '\0')) {
            return 1;
        }
        extensions = terminator;
    }
}

static GLADapiproc glad_egl_get_proc_from_userptr(void *userptr, const char *name) {
    return (GLAD_GNUC_EXTENSION (GLADapiproc (*)(const char *name)) userptr)(name);
}

static int glad_egl_find_extensions_egl(EGLDisplay display) {
    const char *extensions;
    if (!glad_egl_get_extensions(display, &extensions)) return 0;

    GLAD_UNUSED(&glad_egl_has_extension);

    return 1;
}

static int glad_egl_find_core_egl(EGLDisplay display) {
    int major, minor;
    const char *version;

    if (display == NULL) {
        display = EGL_NO_DISPLAY; /* this is usually NULL, better safe than sorry */
    }
    if (display == EGL_NO_DISPLAY) {
        display = eglGetCurrentDisplay();
    }
#ifdef EGL_VERSION_1_4
    if (display == EGL_NO_DISPLAY) {
        display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    }
#endif
#ifndef EGL_VERSION_1_5
    if (display == EGL_NO_DISPLAY) {
        return 0;
    }
#endif

    version = eglQueryString(display, EGL_VERSION);
    (void) eglGetError();

    if (version == NULL) {
        major = 1;
        minor = 0;
    } else {
        GLAD_IMPL_UTIL_SSCANF(version, "%d.%d", &major, &minor);
    }

    GLAD_EGL_VERSION_1_0 = (major == 1 && minor >= 0) || major > 1;
    GLAD_EGL_VERSION_1_1 = (major == 1 && minor >= 1) || major > 1;
    GLAD_EGL_VERSION_1_2 = (major == 1 && minor >= 2) || major > 1;
    GLAD_EGL_VERSION_1_3 = (major == 1 && minor >= 3) || major > 1;
    GLAD_EGL_VERSION_1_4 = (major == 1 && minor >= 4) || major > 1;
    GLAD_EGL_VERSION_1_5 = (major == 1 && minor >= 5) || major > 1;

    return GLAD_MAKE_VERSION(major, minor);
}

int gladLoadEGLUserPtr(EGLDisplay display, GLADuserptrloadfunc load, void* userptr) {
    int version;
    eglGetDisplay = (PFNEGLGETDISPLAYPROC) load(userptr, "eglGetDisplay");
    eglGetCurrentDisplay = (PFNEGLGETCURRENTDISPLAYPROC) load(userptr, "eglGetCurrentDisplay");
    eglQueryString = (PFNEGLQUERYSTRINGPROC) load(userptr, "eglQueryString");
    eglGetError = (PFNEGLGETERRORPROC) load(userptr, "eglGetError");
    if (eglGetDisplay == NULL || eglGetCurrentDisplay == NULL || eglQueryString == NULL || eglGetError == NULL) return 0;

    version = glad_egl_find_core_egl(display);
    if (!version) return 0;
    glad_egl_load_EGL_VERSION_1_0(load, userptr);
    glad_egl_load_EGL_VERSION_1_1(load, userptr);
    glad_egl_load_EGL_VERSION_1_2(load, userptr);
    glad_egl_load_EGL_VERSION_1_4(load, userptr);
    glad_egl_load_EGL_VERSION_1_5(load, userptr);

    if (!glad_egl_find_extensions_egl(display)) return 0;


    return version;
}

int gladLoadEGL(EGLDisplay display, GLADloadfunc load) {
    return gladLoadEGLUserPtr(display, glad_egl_get_proc_from_userptr, GLAD_GNUC_EXTENSION (void*) load);
}

 
#ifdef GLAD_EGL

#ifndef GLAD_LOADER_LIBRARY_C_
#define GLAD_LOADER_LIBRARY_C_

#include <stddef.h>
#include <stdlib.h>

#if GLAD_PLATFORM_WIN32
#include <windows.h>
#else
#include <dlfcn.h>
#endif


static void* glad_get_dlopen_handle(const char *lib_names[], int length) {
    void *handle = NULL;
    int i;

    for (i = 0; i < length; ++i) {
#if GLAD_PLATFORM_WIN32
  #if GLAD_PLATFORM_UWP
        size_t buffer_size = (strlen(lib_names[i]) + 1) * sizeof(WCHAR);
        LPWSTR buffer = (LPWSTR) malloc(buffer_size);
        if (buffer != NULL) {
            int ret = MultiByteToWideChar(CP_ACP, 0, lib_names[i], -1, buffer, buffer_size);
            if (ret != 0) {
                handle = (void*) LoadPackagedLibrary(buffer, 0);
            }
            free((void*) buffer);
        }
  #else
        handle = (void*) LoadLibraryA(lib_names[i]);
  #endif
#else
        handle = dlopen(lib_names[i], RTLD_LAZY | RTLD_LOCAL);
#endif
        if (handle != NULL) {
            return handle;
        }
    }

    return NULL;
}

static void glad_close_dlopen_handle(void* handle) {
    if (handle != NULL) {
#if GLAD_PLATFORM_WIN32
        FreeLibrary((HMODULE) handle);
#else
        dlclose(handle);
#endif
    }
}

static GLADapiproc glad_dlsym_handle(void* handle, const char *name) {
    if (handle == NULL) {
        return NULL;
    }

#if GLAD_PLATFORM_WIN32
    return (GLADapiproc) GetProcAddress((HMODULE) handle, name);
#else
    return GLAD_GNUC_EXTENSION (GLADapiproc) dlsym(handle, name);
#endif
}

#endif /* GLAD_LOADER_LIBRARY_C_ */

struct _glad_egl_userptr {
    void *handle;
    PFNEGLGETPROCADDRESSPROC get_proc_address_ptr;
};

static GLADapiproc glad_egl_get_proc(void *vuserptr, const char* name) {
    struct _glad_egl_userptr userptr = *(struct _glad_egl_userptr*) vuserptr;
    GLADapiproc result = NULL;

    result = glad_dlsym_handle(userptr.handle, name);
    if (result == NULL) {
        result = GLAD_GNUC_EXTENSION (GLADapiproc) userptr.get_proc_address_ptr(name);
    }

    return result;
}

static void* _egl_handle = NULL;

static void* glad_egl_dlopen_handle(void) {
#if GLAD_PLATFORM_APPLE
    static const char *NAMES[] = {"libEGL.dylib"};
#elif GLAD_PLATFORM_WIN32
    static const char *NAMES[] = {"libEGL.dll", "EGL.dll"};
#else
    static const char *NAMES[] = {"libEGL.so.1", "libEGL.so"};
#endif

    if (_egl_handle == NULL) {
        _egl_handle = glad_get_dlopen_handle(NAMES, sizeof(NAMES) / sizeof(NAMES[0]));
    }

    return _egl_handle;
}

static struct _glad_egl_userptr glad_egl_build_userptr(void *handle) {
    struct _glad_egl_userptr userptr;
    userptr.handle = handle;
    userptr.get_proc_address_ptr = (PFNEGLGETPROCADDRESSPROC) glad_dlsym_handle(handle, "eglGetProcAddress");
    return userptr;
}

int gladLoaderLoadEGL(EGLDisplay display) {
    int version = 0;
    void *handle = NULL;
    int did_load = 0;
    struct _glad_egl_userptr userptr;

    did_load = _egl_handle == NULL;
    handle = glad_egl_dlopen_handle();
    if (handle != NULL) {
        userptr = glad_egl_build_userptr(handle);

        if (userptr.get_proc_address_ptr != NULL) {
            version = gladLoadEGLUserPtr(display, glad_egl_get_proc, &userptr);
        }

        if (!version && did_load) {
            gladLoaderUnloadEGL();
        }
    }

    return version;
}


void gladLoaderUnloadEGL(void) {
    if (_egl_handle != NULL) {
        glad_close_dlopen_handle(_egl_handle);
        _egl_handle = NULL;
    }
}

#endif /* GLAD_EGL */

#ifdef __cplusplus
}
#endif