Graphics-Rasterizer/Rasteriser.cpp

#include "Rasteriser.h"

Rasteriser app;

bool Rasteriser::Initialise()
{
	Model modelA;
	Model modelB;
	Model modelC;
	if (MD2Loader::LoadModel(".\\marvin.MD2", modelA, &Model::AddPolygon, &Model::AddVertex))
	{
		_sceneModels.push_back(modelA);
	}
	else
	{
		return false;
	}
	
	if (MD2Loader::LoadModel(".\\megaman.MD2", modelB, &Model::AddPolygon, &Model::AddVertex))
	{
		_sceneModels.push_back(modelB);
	}
	else
	{
		return false;
	}

	if (MD2Loader::LoadModel(".\\w_railgun.MD2", modelC, &Model::AddPolygon, &Model::AddVertex))
	{
		_sceneModels.push_back(modelC);
	}
	else
	{
		return false;
	}
	
	_lights.push_back(new AmbientLight(50, 50, 50));
	_lights.push_back(new DirectionalLight(Vector3D(1, 0, 1), 50, 0, 0));
	_lights.push_back(new PointLight(Vertex(0, 10, 0), 0, 1, 0, 100, 0, 0));
	_cameras.push_back(Camera(0.0f, 0.0f, 0.0f, Vertex(0.0f, 0.0f, -100.0f)));

	return true;
}

void Rasteriser::SetCurrentCamera(int index)
{
	if (index >= 0 && index < _cameras.size())
	{
		_currentCamera = index;
	}	
}

Camera& Rasteriser::GetCamera(int index)
{
	return _cameras[index];
}

Camera& Rasteriser::GetCurrentCamera()
{
	return GetCamera(_currentCamera);
}

void Rasteriser::Update(const Bitmap& bitmap)
{			
	int currentRot = (_rotation % 360);
	Vertex startPos = Vertex(-50, 0, 0);
	int currentZOff = 0;
	int currentModelIndex = 0;

	for (Model &currentModel : _sceneModels)
	{	
		currentModel.EnqueueTransform(GetTranslateMatrix(startPos));
		currentModel.EnqueueTransform(GetRotationMatrix(Axis::Y, (float) currentRot));	
		startPos.SetX(startPos.GetX() + 50);		
		if ((currentModelIndex % 2) == 1)
		{
			currentZOff = 0;
		}
		else
		{
			currentZOff = 100;
		}		
		startPos.SetZ((float)currentZOff);
		currentModelIndex++;
	}

	_currentAspectRatio = (float)(bitmap.GetWidth() / bitmap.GetHeight());
	_currentPerspectiveMatrix = GetPerspectiveProjectionMatrix(1, _currentAspectRatio);
	_currentViewMatrix = GetViewMatrix(1, bitmap.GetWidth(), bitmap.GetHeight());

	if (_rotation == 360)
	{
		_rotation = 0;
	}
	else 
	{
		_rotation += 1;
	}	
}

void Rasteriser::Render(const Bitmap& bitmap)
{		
	ClearViewport(bitmap);
	SelectObject(bitmap.GetDC(), GetStockObject(DC_BRUSH));
	SelectObject(bitmap.GetDC(), GetStockObject(DC_PEN));
	
	for (Model &currentModel : _sceneModels)
	{
		currentModel.SetReflectionCoefficient(0.5f, 0.5f, 0.5f);
		Matrix workingMatrix = workingMatrix.IdentityMatrix();
		for (Matrix currentTransform : currentModel.GetPendingTransforms())
		{
			workingMatrix *= currentTransform;
		}
		currentModel.ApplyTransformToLocalVertices(workingMatrix);
		currentModel.CalculateBackfaces(GetCurrentCamera());
		for (Polygon3D &currentPolygon : currentModel.GetPolygons())
		{
			if (!currentPolygon.GetCulled())
			{
				COLORREF colorWorking = RGB(0, 0, 0);
				for (Light* currentLight : _lights)
				{
					colorWorking = currentLight->CalculateLight(currentModel, currentPolygon, colorWorking);
				}
				currentPolygon.SetColor(colorWorking);
			}
		}
		currentModel.ApplyTransformToTransformedVertices(GetCurrentCamera().GetCurrentCameraTransformMatrix());
		currentModel.Sort();
		currentModel.ApplyTransformToTransformedVertices(_currentPerspectiveMatrix);
		currentModel.DehomogenizeAllVertices();
		currentModel.ApplyTransformToTransformedVertices(_currentViewMatrix);
		DrawSolidFlat(bitmap.GetDC(), currentModel);
		currentModel.ClearPendingTransforms();
	}
}

void Rasteriser::ClearViewport(const Bitmap& bitmap)
{
	bitmap.Clear(RGB(0, 0, 0));
}

void Rasteriser::DrawSquare(HDC hDc, const vector<Vertex> verticies)
{		
	POINT pointArray[4];
	for (int i = 0; i < 4; i++)
	{
		pointArray[i].x = (long) verticies[i].GetX();
		pointArray[i].y = (long) verticies[i].GetY();
	}
	
	SetDCBrushColor(hDc, RGB(255, 0, 255));
	SetDCPenColor(hDc, RGB(0, 0, 255));
	Polygon(hDc, pointArray, 4);
}

void Rasteriser::DrawShape(HDC hDc, const vector<Vertex> verticies)
{	
	vector<POINT> pointArray;
	for (int i = 0; i < verticies.size(); i++)
	{
		POINT newPoint;
		newPoint.x = (long)verticies[i].GetX();
		newPoint.y = (long)verticies[i].GetY();
		pointArray.push_back(newPoint);
	}

	SetDCBrushColor(hDc, RGB(rand() % 256, rand() % 256, rand() % 256));
	SetDCPenColor(hDc, RGB(rand() % 256, rand() % 256, rand() % 256));
	Polygon(hDc, pointArray.data(), (int) verticies.size());
}

void Rasteriser::DrawWireFrame(HDC hDc, Model& model)
{
	vector<POINT> pointArray;
	vector<int> sizeArray;	

	int unculledPolyCount = 0;
	int modelPolygonCount = (int) model.GetPolygonCount();
	for (int i = 0; i < modelPolygonCount; i++)
	{	
		
		if (!model.GetPolygon(i).GetCulled())
		{
			int currentPolygonVertexCount = (int)model.GetPolygon(i).GetPolygonVertexCount();
			for (int j = 0; j < currentPolygonVertexCount; j++)
			{
				POINT newPoint;
				newPoint.x = (long)model.GetVertex(i, j).GetX();
				newPoint.y = (long)model.GetVertex(i, j).GetY();
				pointArray.push_back(newPoint);
			}
			sizeArray.push_back(currentPolygonVertexCount);
			unculledPolyCount++;
		}
	}

	PolyPolygon(hDc, pointArray.data(), sizeArray.data(), unculledPolyCount);
}

void Rasteriser::DrawSolidFlat(HDC hDc, Model& model)
{	
	int modelPolygonCount = (int)model.GetPolygonCount();
	for (int i = 0; i < modelPolygonCount; i++)
	{

		if (!model.GetPolygon(i).GetCulled())
		{
			vector<POINT> pointArray;
			int currentPolygonVertexCount = (int)model.GetPolygon(i).GetPolygonVertexCount();
			for (int j = 0; j < currentPolygonVertexCount; j++)
			{
				POINT newPoint;
				newPoint.x = (long)model.GetVertex(i, j).GetX();
				newPoint.y = (long)model.GetVertex(i, j).GetY();
				pointArray.push_back(newPoint);
			}
			SetDCBrushColor(hDc, model.GetPolygon(i).GetColor());
			SetDCPenColor(hDc, model.GetPolygon(i).GetColor());
			Polygon(hDc, pointArray.data(), currentPolygonVertexCount);
		}
	}
}