Method Init

Engine/source/EtRendering/PlanetTech/Patch.cpp:18–67

void Patch::Init(int16 const levels)
{
	m_Levels = levels;

	I_GraphicsApiContext* const api = Viewport::GetCurrentApiContext();

	//Shader Init
	//***********
	m_pPatchShader = core::ResourceManager::Instance()->GetAssetData<ShaderData>(core::HashString("PlanetPatch.glsl"));
	
	//Buffer Initialisation
	//*********************
	//Generate buffers and arrays
	m_VAO = api->CreateVertexArray();
	m_VBO = api->CreateBuffer();
	m_EBO = api->CreateBuffer();
	m_VBOInstance = api->CreateBuffer();
	//bind
	api->BindVertexArray(m_VAO);
	api->BindBuffer(E_BufferType::Vertex, m_VBO);
	//input layout
	//************
	//geometry
	api->SetVertexAttributeArrayEnabled(0, true);
	api->SetVertexAttributeArrayEnabled(1, true);
	api->DefineVertexAttributePointer(0, 2, E_DataType::Float, false, sizeof(PatchVertex), offsetof(PatchVertex, pos));
	api->DefineVertexAttributePointer(1, 2, E_DataType::Float, false, sizeof(PatchVertex), offsetof(PatchVertex, morph));
	//instances
	//bind
	api->BindBuffer(E_BufferType::Vertex, m_VBOInstance);
	api->SetVertexAttributeArrayEnabled(2, true);
	api->SetVertexAttributeArrayEnabled(3, true);
	api->SetVertexAttributeArrayEnabled(4, true);
	api->SetVertexAttributeArrayEnabled(5, true);
	api->DefineVertexAttribIPointer(2, 1, E_DataType::Int, sizeof(PatchInstance), offsetof(PatchInstance, level));
	api->DefineVertexAttributePointer(3, 3, E_DataType::Float, false, sizeof(PatchInstance), offsetof(PatchInstance, a));
	api->DefineVertexAttributePointer(4, 3, E_DataType::Float, false, sizeof(PatchInstance), offsetof(PatchInstance, r));
	api->DefineVertexAttributePointer(5, 3, E_DataType::Float, false, sizeof(PatchInstance), offsetof(PatchInstance, s));
	api->DefineVertexAttribDivisor(2, 1);
	api->DefineVertexAttribDivisor(3, 1);
	api->DefineVertexAttribDivisor(4, 1);
	api->DefineVertexAttribDivisor(5, 1);
	//Indices
	api->BindBuffer(E_BufferType::Index, m_EBO);
	//unbind
	api->BindBuffer(E_BufferType::Vertex, 0);
	api->BindVertexArray(0);

	GenerateGeometry(m_Levels);
}

void Patch::GenerateGeometry(int16 levels)
{