/* 
 * Copyright (C) 2010 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
 * 
 * Contact:
 * DongKyun Yun <dk77.yun@samsung.com>
 * SangJin Kim <sangjin3.kim@samsung.com>
 * HyunGoo Kang <hyungoo1.kang@samsung.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * Contributors:
 * - S-Core Co., Ltd
 *
 */

#include "implement.h"
#include <dlfcn.h>


__eglMustCastToProperFunctionPointerType EGLAPIENTRY eglGetProcAddress(const char *procname) {
	void* fpAnswer = NULL;
	if (procname == NULL) return NULL;		
	if (procname[0] == '\0') return NULL;	
	if (EGLINTER(global).dlEGL == NULL) {
		if ((EGLINTER(global).dlEGL = dlopen(EGL_SO_FILENAME, RTLD_NOW | RTLD_GLOBAL)) == NULL) {
			return NULL;
		}
	}
	if ((fpAnswer = dlsym(EGLINTER(global).dlEGL, procname)) != NULL) {
		return fpAnswer;
	}

	void** ptrDLL = NULL;
	char* sofilename;
	char* libname;

	EGLContext eglContext = _eglGetCurrentContext();
	if (eglContext != EGL_NO_CONTEXT) {
		struct ContextExtra* pContext = EGLINTER(LookUpContext)(eglContext);
		assert(pContext != NULL);
		switch (pContext->apiKind) {
		case EGL_OPENGL_API:
			ptrDLL = &(EGLINTER(global).dlGL);
			sofilename = GL_SO_FILENAME;
			libname = "GL";
			break;
		case EGL_OPENGL_ES_API:
			if (pContext->apiVersion == 2) {
				ptrDLL = &(EGLINTER(global).dlES2);
				sofilename = GL_ES2_SO_FILENAME;
				libname = "ES2";
			} else {
				ptrDLL = &(EGLINTER(global).dlES1);
				sofilename = GL_ES1_SO_FILENAME;
				libname = "ES1";
			}
			break;
		default:
			return NULL;
			break;
		}
		if (*ptrDLL == NULL) {
			if ((*ptrDLL = dlopen(sofilename, RTLD_NOW | RTLD_GLOBAL)) == NULL) {
				return NULL;
			}
		}
		if ((fpAnswer = dlsym(*ptrDLL, procname)) != NULL) {
			return fpAnswer;
		}
	}
#if 1
	else {
		ptrDLL = &(EGLINTER(global).dlES2);
		sofilename = GL_ES2_SO_FILENAME;
		libname = "ES2";
		if (*ptrDLL == NULL) {
			if ((*ptrDLL = dlopen(sofilename, RTLD_NOW | RTLD_GLOBAL)) == NULL) {
				return NULL;
			}
		}
		if ((fpAnswer = dlsym(*ptrDLL, procname)) != NULL) {
			return fpAnswer;
		}
	}
#endif
	return NULL;
}