Method UpdateBuffer

Engine/source/EtRendering/SceneRendering/SpriteRenderer.cpp:258–290

--------------------------------- SpriteRenderer::UpdateBuffer Recalculates the Vertex buffer

// Recalculates the Vertex buffer
//
void SpriteRenderer::UpdateBuffer()
{
	I_GraphicsApiContext* const api = Viewport::GetCurrentApiContext();

	//Bind Object vertex array
	api->BindVertexArray(m_VAO);

	//Send the vertex buffer again
	api->BindBuffer(E_BufferType::Vertex, m_VBO);

	bool bufferResize = m_Sprites.size() * sizeof( SpriteVertex ) > m_BufferSize;
	if(!m_VBO || bufferResize) //first creation or resize
	{
		if (bufferResize)
		{
			m_BufferSize = (uint32)m_Sprites.size() * sizeof( SpriteVertex );
		}

		api->SetBufferData(E_BufferType::Vertex, m_BufferSize, m_Sprites.data(), E_UsageHint::Dynamic);
	}
	else
	{
		void* p = api->MapBuffer(E_BufferType::Vertex, E_AccessMode::Write);
		memcpy( p, m_Sprites.data(), m_Sprites.size() * sizeof( SpriteVertex ) );
		api->UnmapBuffer(E_BufferType::Vertex);
	}


	api->BindBuffer(E_BufferType::Vertex, 0);

	//Done Modifying
	api->BindVertexArray(0);
}

//---------------------------------
// SpriteRenderer::CalculateTransform