/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
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****************************************************************************/

#include "stdneb.h"
#ifdef __OSX__
#include "../../profilesystem/ProfileSystem.h"
#else
#include "profilesystem/ProfileSystem.h"
#endif
#include "VertexBufferObjectGLES.h"
#include "GLESTypes.h"
#include "GPUProgramGLES.h"

namespace GLES
{
	using namespace RenderBase;

	__ImplementClass(GLES::VertexBufferObjectGLES,'VOGE',RenderBase::VertexBuffer );

VertexBufferObjectGLES::VertexBufferObjectGLES()
: m_VBObejectGLES(0)
{

}

VertexBufferObjectGLES::~VertexBufferObjectGLES()
{
	Discard();
}

void VertexBufferObjectGLES::Discard()
{
	if (m_VBObejectGLES)
	{
		GLESImpl::Instance()->ActiveVertexBufferObject(0);
		glDeleteBuffers(1, &m_VBObejectGLES);
		m_VBObejectGLES = 0;
		PROFILER_ADDDEVICESTATEVAL(videoRam, -GetVertexDataSize());
		PROFILER_ADDDEVICESTATEVAL(vboRam, -GetVertexDataSize());
	}
}

void VertexBufferObjectGLES::BindingVertexLayout(const GPUProgramGLES* pGlesProgram)
{
	GLESImpl::Instance()->ActiveVertexBufferObject(m_VBObejectGLES);

	void* pVertex = NULL;
	uint  offset  = 0;

	const RenderBase::VertexComponents& vertexComponents = this->vertexLayout->GetVertexComponents();

	const SizeT vSize = vertexComponents.Size();

	const Util::Dictionary<VertexComponent::Semantic, Attribute>& activeAttributes = pGlesProgram->GetActiveAttributes();

	for (IndexT compIndex = 0; compIndex < vSize; ++compIndex)
	{
		const VertexComponent& component  = vertexComponents[compIndex];

		VertexComponent::Format format    = component.GetFormat();

		IndexT index = activeAttributes.FindIndex(component.GetSemantic());
		if (index != InvalidIndex)
		{
			const Attribute& attribute = activeAttributes.ValueAtIndex(index);
			const IndexT loc           = attribute.location;
			glEnableVertexAttribArray(loc);
			glVertexAttribPointer(loc, VertexComponent::GetTypeCount(format), GLESTypes::AsGLESBasicType(format), 
				GL_FALSE, static_cast<GLsizei>(this->vertexLayout->GetVertexByteSize()), pVertex);
		}

		GLESImpl::Instance()->CheckError();

		offset += component.GetByteSize();
		pVertex = (char *)NULL + offset;
	}
}

void VertexBufferObjectGLES::UpdateData(const RenderBase::DataStream& stream)
{
	n_assert(stream.data);
	n_assert(vertexDataSize >= stream.sizeInByte);
	GLenum usagegl = GLESTypes::AsGLESUsage(usage);
	if (!m_VBObejectGLES)
	{
		glGenBuffers(1,&m_VBObejectGLES);
	}
	GLESImpl::Instance()->ActiveVertexBufferObject(m_VBObejectGLES);

	glBufferData(GL_ARRAY_BUFFER,
		stream.sizeInByte,
		stream.data,
		usagegl
		);
	GLESImpl::Instance()->CheckError();
}

void VertexBufferObjectGLES::CreateVertexBuffer(const RenderBase::VertexBufferData* vbd, GPtr<VertexBufferObjectGLES>& out)
{
	out = VertexBufferObjectGLES::Create();

	GPtr<VertexLayout> layout = VertexLayout::Create();
	layout->Setup(vbd->vertex.vertexComponents);
	int vertexBufferSize = vbd->vertexCount * layout->GetVertexByteSize();
	out->_SetVertexDataSize(vertexBufferSize);
	out->_SetNumVertices(vbd->vertexCount);
	out->_SetUsage(vbd->usage);
	out->_SetVertexLayout(layout);

	GLenum usagegl = GLESTypes::AsGLESUsage(vbd->usage);

	GLuint bufferObj = 0;

	// create buffer
	glGenBuffers(1,&bufferObj);

	GLESImpl::Instance()->CheckError();
	out->_SetGLESVertexBuffer(bufferObj);
	if (vbd->vertex.vertexComponentStreams.Size())
	{
		uchar* dstPtr = n_new_array(uchar, vertexBufferSize);
		DirectCopyVertexDataToGraphicBuffer(*vbd, dstPtr, layout->GetVertexByteSize());
		GLESImpl::Instance()->ActiveVertexBufferObject(bufferObj);

		glBufferData(GL_ARRAY_BUFFER,
			vertexBufferSize,
			dstPtr,
			usagegl
			);
		GLESImpl::Instance()->CheckError();
		n_delete_array(dstPtr);


		PROFILER_ADDDEVICESTATEVAL(videoRam, vertexBufferSize);
		PROFILER_ADDDEVICESTATEVAL(vboRam, vertexBufferSize);

		GLESImpl::Instance()->ActiveVertexBufferObject(0);
	}
}

void VertexBufferObjectGLES::OnDeviceLost()
{
	m_VBObejectGLES = 0;
}

void VertexBufferObjectGLES::OnDeviceReset()
{
	if (this->usage == RenderBase::BufferData::Dynamic)
	{
		glGenBuffers(1, &m_VBObejectGLES);
	}
}

}