protected override void UpdateStates(int stateIndex1, int stateIndex2)
{
var state1 = Light.States[stateIndex1];
var state2 = Light.States[stateIndex2];
LightViewer.CalculateLightCone(state1, out Position1, out Direction1, out Angle1, out Radius1, out Distance1, out Color1);
LightViewer.CalculateLightCone(state2, out Position2, out Direction2, out Angle2, out Radius2, out Distance2, out Color2);
}
public LightConePrimitive(LightViewer lightViewer, RenderProcess renderProcess, Light light)
: base(light)
{
Debug.Assert(light.Type == LightType.Cone, "LightConePrimitive is only for LightType.Cone lights.");
if (VertexDeclaration == null)
{
VertexDeclaration = new VertexDeclaration(renderProcess.GraphicsDevice, LightConeVertex.VertexElements);
}
if (VertexBuffer == null)
{
var vertexData = new LightConeVertex[(CircleSegments + 2) * StateCount];
SetUpTransitions((state, stateIndex1, stateIndex2) =>
{
var state1 = Light.States[stateIndex1];
var state2 = Light.States[stateIndex2];
#if DEBUG_LIGHT_TRANSITIONS
Console.WriteLine(" Transition {0} is from state {1} to state {2} over {3:F1}s", state, stateIndex1, stateIndex2, state1.Duration);
#endif
Vector3 position1, position2, direction1, direction2;
float angle1, angle2, radius1, radius2, distance1, distance2;
Vector4 color1, color2;
LightViewer.CalculateLightCone(state1, out position1, out direction1, out angle1, out radius1, out distance1, out color1);
LightViewer.CalculateLightCone(state2, out position2, out direction2, out angle2, out radius2, out distance2, out color2);
var direction1Right = Vector3.Cross(direction1, Vector3.UnitY);
var direction1Up = Vector3.Cross(direction1Right, direction1);
var direction2Right = Vector3.Cross(direction2, Vector3.UnitY);
var direction2Up = Vector3.Cross(direction2Right, direction2);
for (var i = 0; i < CircleSegments; i++)
{
var a1 = MathHelper.TwoPi * i / CircleSegments;
var a2 = MathHelper.TwoPi * (i + 1) / CircleSegments;
var v1 = position1 + direction1 * distance1 + direction1Right * (float)(radius1 * Math.Cos(a1)) + direction1Up * (float)(radius1 * Math.Sin(a1));
var v2 = position2 + direction2 * distance2 + direction2Right * (float)(radius2 * Math.Cos(a2)) + direction2Up * (float)(radius2 * Math.Sin(a2));
vertexData[(CircleSegments + 2) * state + i] = new LightConeVertex(v1, v2, color1, color2);
}
vertexData[(CircleSegments + 2) * state + CircleSegments + 0] = new LightConeVertex(position1, position2, color1, color2);
vertexData[(CircleSegments + 2) * state + CircleSegments + 1] = new LightConeVertex(new Vector3(position1.X, position1.Y, position1.Z - distance1), new Vector3(position2.X, position2.Y, position2.Z - distance2), color1, color2);
});
VertexBuffer = new VertexBuffer(renderProcess.GraphicsDevice, typeof(LightConeVertex), vertexData.Length, BufferUsage.WriteOnly);
VertexBuffer.SetData(vertexData);
}
if (IndexBuffer == null)
{
var indexData = new short[6 * CircleSegments];
for (var i = 0; i < CircleSegments; i++)
{
var i2 = (i + 1) % CircleSegments;
indexData[6 * i + 0] = (short)(CircleSegments + 0);
indexData[6 * i + 1] = (short)i2;
indexData[6 * i + 2] = (short)i;
indexData[6 * i + 3] = (short)i;
indexData[6 * i + 4] = (short)i2;
indexData[6 * i + 5] = (short)(CircleSegments + 1);
}
IndexBuffer = new IndexBuffer(renderProcess.GraphicsDevice, typeof(short), indexData.Length, BufferUsage.WriteOnly);
IndexBuffer.SetData(indexData);
}
UpdateState(lightViewer);
}
