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Author: Tyecon (posted 2013-03-25 09:50:36, viewed 228 times)

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package Rendering;

import IO.Entity;
import IO.Updatable;
import Scheduler.InputHandler;
import static java.lang.Math.*;
import java.nio.FloatBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.vector.Matrix4f;
import org.lwjgl.util.vector.Vector3f;

public final class Camera extends Updatable {
    private final Vector3f cameraPos;
    private final Vector3f cameraRot;
    private Matrix4f projectionMatrix;
    private Matrix4f viewMatrix;
    public final FloatBuffer viewBuffer, projBuffer;
    
    private float vpX, vpY;
    private int vpPX=0, vpPY=0;
    private float fieldOfView;
    private float aspectRatio;
    private float nearPlane;
    private float farPlane;
    private float yScale;
    private float xScale;
    private float frustumLength;

    public Camera() {
        this("Camera");
    }
    
    public Camera(String id) {
        this(id, null);
    }
    
    public Camera(String id, Entity Parent) {
        super(id, Parent);
        viewBuffer=BufferUtils.createFloatBuffer(16);
        projBuffer=BufferUtils.createFloatBuffer(16);
        cameraPos=new Vector3f(0,0,-15);
        cameraRot=new Vector3f(0,0,0);
        viewMatrix=new Matrix4f();
        calculateProjection();
        calculateView();
    }
    
    public final void moveForward(float distance, boolean y) {
        cameraPos.z += distance*cos(toRadians(cameraRot.x));
        cameraPos.x += distance*sin(toRadians(cameraRot.x));
        if (y) {cameraPos.y -= distance*sin(toRadians(cameraRot.y));}
        calculateView();
    }
    
    public final void moveSide(float distance) {
        cameraPos.x += distance*cos(toRadians(-cameraRot.x));
        cameraPos.z += distance*sin(toRadians(-cameraRot.x));
        calculateView();
    }
    
    public final void processMouse() {
        float mouseDX=InputHandler.dX*InputHandler.mouseS;
        float mouseDY=InputHandler.dY*InputHandler.mouseS;
        if (cameraRot.x+mouseDX>=360) {
            cameraRot.x=cameraRot.x+mouseDX-360;
        } else if (cameraRot.x+mouseDX<0) {
            cameraRot.x=360-cameraRot.x+mouseDX;
        } else {
            cameraRot.x+=mouseDX;
        }
        if (cameraRot.y-mouseDY>=-90 && cameraRot.y-mouseDY<=90) {
            cameraRot.y+=-mouseDY;
        } else if (cameraRot.y-mouseDY<-90) {
            cameraRot.y=-90;
        } else if (cameraRot.y-mouseDY>0) {
            cameraRot.y=90;
        }
        calculateView();
    }
    
    private void calculateProjection() {
        projectionMatrix=new Matrix4f();
        vpX=1; vpY=1;
        fieldOfView=60f;
        aspectRatio=(Display.getWidth()*vpX)/(Display.getHeight()*vpY);
        nearPlane=0.01f;
        farPlane=100f;
        yScale=(float) (1/Math.tan(((fieldOfView/2f)*(Math.PI/180))));
        xScale=yScale/aspectRatio;
        frustumLength=farPlane-nearPlane;
        projectionMatrix.m00=xScale;
        projectionMatrix.m11=yScale;
        projectionMatrix.m22=-((farPlane+nearPlane)/frustumLength);
        projectionMatrix.m23=-1;
        projectionMatrix.m32=-((2*nearPlane*farPlane)/frustumLength);
        GL11.glViewport(vpPX,vpPY,Math.round(Display.getWidth()*vpX),Math.round(Display.getHeight()*vpY));
        projectionMatrix.store(projBuffer);
        projBuffer.flip();
    }
    
    private void calculateView() {
        viewMatrix=new Matrix4f();
        Matrix4f.rotate((float)Math.toRadians(cameraRot.z), new Vector3f(0,0,1), viewMatrix, viewMatrix);
        Matrix4f.rotate((float)Math.toRadians(cameraRot.y), new Vector3f(1,0,0), viewMatrix, viewMatrix);
        Matrix4f.rotate((float)Math.toRadians(cameraRot.x), new Vector3f(0,1,0), viewMatrix, viewMatrix);
        Matrix4f.translate(new Vector3f(-cameraPos.x, -cameraPos.y, cameraPos.z), viewMatrix, viewMatrix);
        viewMatrix.store(viewBuffer);
        viewBuffer.flip();
    }

    @Override
    public void Update() {
        recurseUpdate();
    }

    public Vector3f getCameraPos() {
        return cameraPos;
    }

    public Vector3f getCameraRot() {
        return cameraRot;
    }

    public void setCameraPos(Vector3f cameraPos) {
        this.cameraPos.set(cameraPos);
        calculateView();
    }

    public void setCameraRot(Vector3f cameraRot) {
        this.cameraRot.set(cameraRot);
        calculateView();
    }
    
    
}





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