public PongMaterials (ContentManager content)
: base(content) {
var addBs = new BlendState {
AlphaBlendFunction = BlendFunction.Add,
ColorBlendFunction = BlendFunction.Add,
AlphaSourceBlend = Blend.One,
ColorSourceBlend = Blend.One,
AlphaDestinationBlend = Blend.One,
ColorDestinationBlend = Blend.One
};
var ds = new DepthStencilState {
DepthBufferEnable = false
};
// Set up various blending modes by changing render states
var additiveBlend = new Action<DeviceManager>[] {
(dm) => {
dm.Device.BlendState = addBs;
dm.Device.DepthStencilState = ds;
}
};
var subBs = new BlendState {
AlphaBlendFunction = BlendFunction.ReverseSubtract,
ColorBlendFunction = BlendFunction.ReverseSubtract,
AlphaSourceBlend = Blend.One,
ColorSourceBlend = Blend.One,
AlphaDestinationBlend = Blend.One,
ColorDestinationBlend = Blend.One
};
var subtractiveBlend = new Action<DeviceManager>[] {
(dm) => {
dm.Device.BlendState = subBs;
dm.Device.DepthStencilState = ds;
}
};
var alphaBs = new BlendState {
AlphaBlendFunction = BlendFunction.Add,
ColorBlendFunction = BlendFunction.Add,
AlphaSourceBlend = Blend.SourceAlpha,
ColorSourceBlend = Blend.SourceAlpha,
AlphaDestinationBlend = Blend.InverseSourceAlpha,
ColorDestinationBlend = Blend.InverseSourceAlpha
};
var alphaBlend = new Action<DeviceManager>[] {
(dm) => {
dm.Device.BlendState = alphaBs;
dm.Device.DepthStencilState = ds;
}
};
// Replace the default materials with ones that set up our custom render states
ScreenSpaceBitmap = new DelegateMaterial(
base.ScreenSpaceBitmap,
alphaBlend,
null
);
ScreenSpaceGeometry = new DelegateMaterial(
base.ScreenSpaceGeometry,
alphaBlend,
null
);
// Create a couple custom materials
Trail = new DelegateMaterial(
base.ScreenSpaceBitmap,
additiveBlend,
null
);
SubtractiveGeometry = new DelegateMaterial(
base.ScreenSpaceGeometry,
subtractiveBlend,
null
);
}