/* 
 * 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 "gl_imp.h"
#include <malloc.h>
#include <string.h>

#if ! defined(GL_BUFFER_ACCESS)
#define	GL_BUFFER_ACCESS	0x88BB	
#endif
#if ! defined(GL_WRITE_ONLY)
#define	GL_WRITE_ONLY		0x88B9	
#endif

static void INTFN(ResizeBuffer)(int n) {
	if (CCV(nBuffer) <= n) {
		int newSize = CCV(nBuffer);
		while (newSize <= n) { newSize *= 2; }
		CCV(pBufferStatus) = realloc(CCV(pBufferStatus), newSize * sizeof(GLint));
		memset(CCV(pBufferStatus) + CCV(nBuffer), 0, (newSize - CCV(nBuffer)) * sizeof(GLint));
		CCV(nBuffer) = newSize;
	}
}

#if ALEXGL_INTERNAL_VERSION >= 110
GL_API void GL_APIENTRY EXTFN(GenBuffers)(GLsizei n, GLuint* buffers) {
	int max;
	int i;
	FNPTR(GenBuffers)(n, buffers);
	max = 0;
	for (i = 0; buffers != NULL && i < n; i++) {
		if (buffers[i] > max) max = buffers[i];
	}
	INTFN(ResizeBuffer)(max);
	for (i = 0; buffers != NULL && i < n; i++) {
		CCV(pBufferStatus)[buffers[i]] = ALEXGL_BUFFER_GENERATED;
	}
}
#endif

#if ALEXGL_INTERNAL_VERSION >= 110
GL_API void GL_APIENTRY EXTFN(BindBuffer)(GLenum target, GLuint buffer) {
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		INTFN(SetError)(GL_INVALID_ENUM);
		return;
	}
	FNPTR(BindBuffer)(target, buffer);
	INTFN(ResizeBuffer)(buffer);
	CCV(pBufferStatus)[buffer] = ALEXGL_BUFFER_BOUND;
}
#endif

#if ALEXGL_INTERNAL_VERSION >= 110
GL_API void GL_APIENTRY EXTFN(DeleteBuffers)(GLsizei n, const GLuint* buffers) {
	int max;
	int i;
	FNPTR(DeleteBuffers)(n, buffers);
	max = 0;
	for (i = 0; buffers != NULL && i < n; i++) {
		if (buffers[i] > max) max = buffers[i];
	}
	INTFN(ResizeBuffer)(max);
	for (i = 0; buffers != NULL && i < n; i++) {
		CCV(pBufferStatus)[buffers[i]] = ALEXGL_BUFFER_NULL;
	}
}
#endif

#if ALEXGL_INTERNAL_VERSION >= 110
GL_API GLboolean GL_APIENTRY EXTFN(IsBuffer)(GLuint buffer) {
	register GLboolean bAnswer;
	bAnswer = FNPTR(IsBuffer)(buffer);
	INTFN(ResizeBuffer)(buffer);
	if (bAnswer == GL_TRUE && CCV(pBufferStatus)[buffer] != ALEXGL_BUFFER_BOUND) {
		bAnswer = GL_FALSE;
	}
	return (bAnswer == GL_FALSE) ? GL_FALSE : GL_TRUE;
}
#endif

#if ALEXGL_INTERNAL_VERSION >= 110
GL_API void GL_APIENTRY EXTFN(GetBufferParameteriv)(GLenum target, GLenum pname, GLint* params) {
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		INTFN(SetError)(GL_INVALID_ENUM);
		return;
	}
	if (pname != GL_BUFFER_SIZE && pname != GL_BUFFER_USAGE && pname != GL_BUFFER_ACCESS) {
		INTFN(SetError)(GL_INVALID_ENUM);
		return;
	}
	FNPTR(GetBufferParameteriv)(target, pname, params);
	if (pname == GL_BUFFER_ACCESS && *params == GL_READ_WRITE) {
		*params = GL_WRITE_ONLY;
	}
}
#endif

#if ALEXGL_INTERNAL_VERSION >= 110
GL_API void GL_APIENTRY EXTFN(BufferData)(GLenum target,
		GLsizeiptr size, const GLvoid* data, GLenum usage) {
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		INTFN(SetError)(GL_INVALID_ENUM);
		return;
	}
	if (usage != GL_STATIC_DRAW && usage != GL_DYNAMIC_DRAW) {
		INTFN(SetError)(GL_INVALID_ENUM);
		return;
	}
	FNPTR(BufferData)(target, size, data, usage);
}
#endif

#if ALEXGL_INTERNAL_VERSION >= 110
GL_API void GL_APIENTRY EXTFN(BufferSubData)(GLenum target,
		GLintptr offset, GLsizeiptr size, const GLvoid* data) {
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		INTFN(SetError)(GL_INVALID_ENUM);
		return;
	}
	FNPTR(BufferSubData)(target, offset, size, data);
}
#endif