/* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

 *

 * 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

 * BRIAN PAUL 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.

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:

 *

 */

#include "common.h"

#include "hgl.h"

#include "context.h"

DGLBuffer* DGLBuffer_create(GLuint name)

{

	DGLBuffer* buffer = malloc(sizeof(DGLBuffer));

	if(buffer == NULL)

	{

		return NULL;

	}

	buffer->obj.name = name;

	buffer->obj.next = NULL;

	buffer->data = NULL;

	buffer->size = 0;

	buffer->usage = GL_STATIC_DRAW;

	return buffer;

}

void DGLBuffer_destroy(DGLBuffer *buffer)

{

	DGLES2_ASSERT(buffer != NULL);

	if(buffer->data != NULL)

	{

		free(buffer->data);

		buffer->data = NULL;

	}

	free(buffer);

}

GL_APICALL_BUILD void GL_APIENTRY glBindBuffer(GLenum target, GLuint buffer)

{

	DGLES2_ENTER();

	DGLContext_getHostError(ctx);

	// The buffers are stored in both the wrapper and host.

	ctx->hgl.BindBuffer(target, buffer);

	if(DGLContext_getHostError(ctx) == GL_NO_ERROR)

	{

		if(target == GL_ARRAY_BUFFER)

		{

			if(!DGLContext_bindBuffer(ctx, buffer))

			{

				DGLES2_ERROR(GL_OUT_OF_MEMORY);

			}

		}

		else

		{

			DGLES2_ERROR_IF(target != GL_ELEMENT_ARRAY_BUFFER, GL_INVALID_ENUM);

		}

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glBufferData(GLenum target, GLsizeiptr size, const void* data, GLenum usage)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(size < 0, GL_INVALID_VALUE);

	DGLES2_ERROR_IF(usage != GL_STATIC_DRAW && usage != GL_DYNAMIC_DRAW && usage != GL_STREAM_DRAW, GL_INVALID_ENUM);

	DGLContext_getHostError(ctx);

	// The buffers are stored in both the wrapper and host.

	ctx->hgl.BufferData(target, size, data, usage);

	if(DGLContext_getHostError(ctx) == GL_NO_ERROR)

	{

		if(target == GL_ARRAY_BUFFER)

		{

			DGLBuffer* buffer;

			DGLES2_ERROR_IF(ctx->buffer_binding == 0, GL_INVALID_OPERATION);

			buffer = DGLContext_findBuffer(ctx, ctx->buffer_binding);

			DGLES2_ASSERT(buffer != NULL);

			if(buffer->data != NULL)

			{

				// Delete old data.

				free(buffer->data);

			}

			buffer->data = malloc(size);

			if(buffer->data == NULL)

			{

				DGLES2_ERROR(GL_OUT_OF_MEMORY);

			}

			if(data != NULL)

			{

				// Copy new data.

				memcpy(buffer->data, data, size);

			}

			buffer->size = size;

			buffer->usage = usage;

		}

		else

		{

			DGLES2_ERROR_IF(target != GL_ELEMENT_ARRAY_BUFFER, GL_INVALID_ENUM);

		}

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size, const void* data)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(offset < 0, GL_INVALID_VALUE);

	DGLES2_ERROR_IF(size < 0, GL_INVALID_VALUE);

	DGLContext_getHostError(ctx);

	// The buffers are stored in both the wrapper and host.

	ctx->hgl.BufferSubData(target, offset, size, data);

	if(DGLContext_getHostError(ctx) == GL_NO_ERROR)

	{

		if(target == GL_ARRAY_BUFFER)

		{

			DGLBuffer* buffer;

			DGLES2_ERROR_IF(target != GL_ARRAY_BUFFER, GL_INVALID_ENUM);

			DGLES2_ERROR_IF(ctx->buffer_binding == 0, GL_INVALID_OPERATION);

			buffer = DGLContext_findBuffer(ctx, ctx->buffer_binding);

			DGLES2_ASSERT(buffer != NULL);

			memcpy((char*)buffer->data + offset, data, size);

		}

		else

		{

			DGLES2_ERROR_IF(target != GL_ELEMENT_ARRAY_BUFFER, GL_INVALID_ENUM);

		}

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glDeleteBuffers(GLsizei n, const GLuint* buffers)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(n < 0, GL_INVALID_VALUE);

	DGLContext_getHostError(ctx);

	// The buffers are stored in both the wrapper and host.

	ctx->hgl.DeleteBuffers(n, buffers);

	if(DGLContext_getHostError(ctx) == GL_NO_ERROR)

	{

		int i;

		for(i = 0; i < n; i++)

		{

			DGLContext_destroyBuffer(ctx, buffers[i]);

		}

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGenBuffers(GLsizei n, GLuint* buffers)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(n < 0, GL_INVALID_VALUE);

	// The buffers are stored in both the wrapper and host.

	// Let the host come up with free buffer names. 

	ctx->hgl.GenBuffers(n, buffers);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGetBufferParameteriv(GLenum target, GLenum pname, GLint* params)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(pname != GL_BUFFER_USAGE && pname != GL_BUFFER_SIZE, GL_INVALID_ENUM);

	ctx->hgl.GetBufferParameteriv(target, pname, params);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD GLboolean GL_APIENTRY glIsBuffer(GLuint buffer)

{

	DGLES2_ENTER_RET(GL_FALSE);

	DGLES2_LEAVE_RET(ctx->hgl.IsBuffer(buffer));

}