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 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();
}