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/*
* Copyright 2010 Inalogic Inc.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the applicable version of the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of both the GNU Lesser General Public
* License version 3 along with this program. If not, see
* <http://www.gnu.org/licenses/>
*
* Authored by: Jay Taoko <jaytaoko@inalogic.com>
*
*/
#include "GpuDevice.h"
#include "GLDeviceObjects.h"
#include "IOpenGLIndexBuffer.h"
namespace nux
{
NUX_IMPLEMENT_OBJECT_TYPE (IOpenGLIndexBuffer);
IOpenGLIndexBuffer::IOpenGLIndexBuffer (t_u32 Length, VBO_USAGE Usage, INDEX_FORMAT Format, NUX_FILE_LINE_DECL)
: IOpenGLResource (RTINDEXBUFFER, NUX_FILE_LINE_PARAM)
, _Length (Length)
, _Format (Format)
, _Usage (Usage)
, _MemMap (0)
, _OffsetToLock (0)
, _SizeToLock (0)
{
CHECKGL ( glGenBuffersARB (1, &_OpenGLID) );
CHECKGL ( glBindBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, _OpenGLID) );
CHECKGL ( glBufferDataARB (GL_ELEMENT_ARRAY_BUFFER_ARB, _Length, NULL, Usage) );
CHECKGL ( glBindBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, 0) );
GRunTimeStats.Register (this);
}
IOpenGLIndexBuffer::~IOpenGLIndexBuffer()
{
CHECKGL ( glDeleteBuffersARB (1, &_OpenGLID) );
_OpenGLID = 0;
GRunTimeStats.UnRegister (this);
}
int IOpenGLIndexBuffer::Lock (
t_u32 OffsetToLock,
t_u32 SizeToLock,
void **ppbData)
{
nuxAssert (SizeToLock <= _Length);
nuxAssert (OffsetToLock + SizeToLock <= _Length);
if (SizeToLock == 0)
{
if (OffsetToLock == 0)
{
// lock the entire buffer
SizeToLock = _Length;
}
else
return OGL_INVALID_CALL;
}
// If _MemMap, _OffsetToLock and _SizeToLock are not equal to zero, then we have already mapped the buffer
// Unlock it before locking again.
nuxAssert (_MemMap == 0);
nuxAssert (_OffsetToLock == 0);
nuxAssert (_SizeToLock == 0);
CHECKGL ( glBindBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, _OpenGLID) );
// Map the Entire buffer into system memory
_MemMap = (BYTE *) glMapBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB); // todo: use Format instead of GL_WRITE_ONLY_ARB
CHECKGL_MSG (glMapBufferARB);
*ppbData = (void *) (_MemMap + OffsetToLock);
_OffsetToLock = OffsetToLock;
_SizeToLock = SizeToLock;
CHECKGL ( glBindBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, 0) );
return OGL_OK;
}
int IOpenGLIndexBuffer::Unlock()
{
nuxAssert (_MemMap != 0);
nuxAssert (_SizeToLock != 0);
// No need to bind
CHECKGL ( glBindBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, _OpenGLID) );
_MemMap = 0;
_OffsetToLock = 0;
_SizeToLock = 0;
CHECKGL ( glUnmapBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB) );
CHECKGL ( glBindBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, 0) );
return OGL_OK;
}
int IOpenGLIndexBuffer::GetStride()
{
if (_Format == INDEX_FORMAT_USHORT)
{
return 2;
}
else if (_Format == INDEX_FORMAT_UINT)
{
return 4;
}
else
return 0;
}
void IOpenGLIndexBuffer::BindIndexBuffer()
{
CHECKGL (glBindBufferARB (GL_ELEMENT_ARRAY_BUFFER_ARB, _OpenGLID) );
}
t_u32 IOpenGLIndexBuffer::GetSize()
{
return _Length;
}
}
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