private void billboardRotation(Camera camera) {
Matrix4f matrix =
Maths.createTransformationMatrix(
new Vector3f(
camera.getPosition().x,
camera.getPosition().y + DayNightCycle.getSunY(),
camera.getPosition().z + DayNightCycle.getSunZ()),
0,
0,
0,
DayNightCycle.getSunScale());
Vector3f objToCamProj, objToCam;
float angleCosine;
objToCamProj = new Vector3f(0, 0, DayNightCycle.getSunZ());
/*lookAt = new Vector3f(0,0,1);
try{
objToCamProj.normalise();
lookAt.normalise();
angleCosine = Vector3f.dot(lookAt, objToCamProj);
if((angleCosine < 1f) && (angleCosine > -1f)){
if(objToCamProj.x > 0)
matrix.rotate((float)(Math.acos(angleCosine)), new Vector3f(0,1,0));
else
matrix.rotate((float)(Math.acos(angleCosine)), new Vector3f(0,-1,0));
}
}catch(Exception e){
}*/
objToCam = new Vector3f(0, -DayNightCycle.getSunY(), -DayNightCycle.getSunZ());
try {
objToCamProj.normalise();
objToCam.normalise();
angleCosine = Vector3f.dot(objToCamProj, objToCam);
if ((angleCosine < 1) && (angleCosine > -1)) {
if (objToCam.y < 0) matrix.rotate((float) (Math.acos(angleCosine)), new Vector3f(1, 0, 0));
else matrix.rotate((float) (Math.acos(angleCosine)), new Vector3f(-1, 0, 0));
}
} catch (Exception e) {
}
shader.loadTransformationMatrix(matrix);
}
public void Draw() {
mCamera.Set();
/*mShadowMaskObject.Begin();
{
glPushAttrib(GL_COLOR_BUFFER_BIT);
{
mShadowMaskObject.Clear();
glPushMatrix();
{
glLoadIdentity();
glColor3f(0, 0, 0);
glBegin(GL_QUADS);
{
glVertex2f(0, 0);
glVertex2f(mGameWindow.Width(), 0);
glVertex2f(mGameWindow.Width(), mGameWindow.Height());
glVertex2f(0, mGameWindow.Height());
}
glEnd();
}
glPopMatrix();
}
glPopAttrib();
}
mShadowMaskObject.End();*/
CalculateLighting();
DrawScene();
// draw mask over scene to occlude shadows
glPushMatrix();
{
glLoadIdentity();
glColor4f(1, 1, 1, 1);
Texture.Begin();
{
mShadowMask.BindTexture();
mShadowMask.Draw(0, 0, 1, -1);
}
Texture.End();
}
glPopMatrix();
}
public void Load() {
mCamera = new Camera(GetGameWindow());
Light.Load(mGameWindow.Width(), mGameWindow.Height());
ComplexPolygon.Load(mGameWindow.Width(), mGameWindow.Height());
mShadowMask = new Texture(mGameWindow.Width(), mGameWindow.Height());
try {
mShadowMaskObject = new FrameBufferObject(mShadowMask);
} catch (Exception e) {
e.printStackTrace();
}
mCamera.ForceScaleFocus((mGameWindow.Width() / 1600.0f + mGameWindow.Height() / 900.0f) / 2);
mAmbientLighting = 0.0f;
}
public void CalculateLighting() {
mShadowMaskObject.Begin();
{
glPushAttrib(GL_COLOR_BUFFER_BIT);
{
mShadowMaskObject.Clear();
// additive blending
glBlendFunc(GL_ONE, GL_ONE);
// Draw lights:
// ambient lighting
glPushMatrix();
{
glLoadIdentity();
glColor4f(1, 1, 1, mAmbientLighting);
glBegin(GL_QUADS);
{
glVertex2f(0, 0);
glVertex2f(mGameWindow.Width(), 0);
glVertex2f(mGameWindow.Width(), mGameWindow.Height());
glVertex2f(0, mGameWindow.Height());
}
glEnd();
}
glPopMatrix();
Vector2 middleScreen =
mCamera.ScreenToWorld(
new Vector2(mGameWindow.Width(), mGameWindow.Height()).DividedBy(2));
Vector2 topLeft = mCamera.ScreenToWorld(new Vector2(0, 0));
Vector2 topRight = mCamera.ScreenToWorld(new Vector2(mGameWindow.Width(), 0));
Vector2 bottomRight =
mCamera.ScreenToWorld(new Vector2(mGameWindow.Width(), mGameWindow.Height()));
Vector2 bottomLeft = mCamera.ScreenToWorld(new Vector2(0, mGameWindow.Height()));
SimplePolygon screen = new SimplePolygon(this, middleScreen);
screen.AddVertexAbsolute(topLeft);
screen.AddVertexAbsolute(topRight);
screen.AddVertexAbsolute(bottomRight);
screen.AddVertexAbsolute(bottomLeft);
mLevel.DrawLights(screen);
// blend lights with shadow:
glPushMatrix();
{
glLoadIdentity();
glBlendFuncSeparate(GL_ONE, GL_ZERO, GL_ONE_MINUS_DST_ALPHA, GL_ZERO);
glColor3f(0, 0, 0);
glBegin(GL_QUADS);
{
glVertex2f(0, 0);
glVertex2f(mGameWindow.Width(), 0);
glVertex2f(mGameWindow.Width(), mGameWindow.Height());
glVertex2f(0, mGameWindow.Height());
}
glEnd();
}
glPopMatrix();
}
glPopAttrib();
}
mShadowMaskObject.End();
}
public void Update(GameTime gameTime) {
mCamera.Update(gameTime);
}