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#include "EffekseerRendererGL.IndexBuffer.h"
#include "EffekseerRendererGL.GLExtension.h"

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namespace EffekseerRendererGL
{
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IndexBuffer::IndexBuffer(const Backend::GraphicsDeviceRef& graphicsDevice, GLuint buffer, int maxCount, bool isDynamic, int32_t stride)
	: DeviceObject(graphicsDevice.Get())
	, IndexBufferBase(maxCount, isDynamic)
	, m_buffer(buffer)
{
	stride_ = stride;
	m_resource = new uint8_t[m_indexMaxCount * stride_];
}

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IndexBuffer::~IndexBuffer()
{
	delete[] m_resource;
	glDeleteBuffers(1, &m_buffer);
}

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IndexBuffer* IndexBuffer::Create(const Backend::GraphicsDeviceRef& graphicsDevice, int maxCount, bool isDynamic, int32_t stride)
{
	GLuint ib;
	glGenBuffers(1, &ib);
	return new IndexBuffer(graphicsDevice, ib, maxCount, isDynamic, stride);
}

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void IndexBuffer::OnLostDevice()
{
	glDeleteBuffers(1, &m_buffer);
	m_buffer = 0;
}

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void IndexBuffer::OnResetDevice()
{
	if (IsValid())
		return;
	GLuint ib;
	glGenBuffers(1, &ib);
	m_buffer = ib;
}

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void IndexBuffer::Lock()
{
	assert(!m_isLock);

	m_isLock = true;
	m_indexCount = 0;
}

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void IndexBuffer::Unlock()
{
	assert(m_isLock);

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexCount * stride_, m_resource, GL_DYNAMIC_DRAW);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

	m_isLock = false;
}

bool IndexBuffer::IsValid()
{
	return m_buffer != 0;
}

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} // namespace EffekseerRendererGL
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