public override void render(Graphics graphics, Camera camera)
{
if (power > 0 && isVisibleFromCamera(camera))
{
var size = radius * 2f;
var obstacles = Physics.boxcastBroadphase(new RectangleF(entity.transform.position.X - radius, entity.transform.position.Y - radius, size, size), collidesWithLayers);
// Compute the visibility mesh
var visibility = new VisibilityComputer(entity.transform.position, radius);
foreach (var v in obstacles)
{
visibility.addSquareOccluder(v.bounds);
}
// Generate a triangle list from the encounter points
VertexPositionTexture[] vertices;
short[] indices;
var encounters = visibility.computeVisibilityPolygon();
triangleListFromEncounters(encounters, out vertices, out indices);
Core.graphicsDevice.BlendState = BlendState.Additive;
Core.graphicsDevice.RasterizerState = RasterizerState.CullNone;
// Apply the effect
_lightEffect.Parameters["viewProjectionMatrix"].SetValue(entity.scene.camera.viewProjectionMatrix);
_lightEffect.Parameters["lightSource"].SetValue(entity.transform.position);
_lightEffect.Parameters["lightColor"].SetValue(color.ToVector3() * power);
_lightEffect.Parameters["lightRadius"].SetValue(radius);
_lightEffect.Techniques[0].Passes[0].Apply();
// Draw the light on screen, using the triangle fan from the computed
// visibility mesh so that the light only influences the area that can be
// "seen" from the light's position.
Core.graphicsDevice.DrawUserIndexedPrimitives <VertexPositionTexture>
(
PrimitiveType.TriangleList,
vertices,
0,
vertices.Length,
indices,
0,
indices.Length / 3
);
}
}
public override void render(Graphics graphics, Camera camera)
{
if (power > 0 && isVisibleFromCamera(camera))
{
var totalOverlaps = Physics.overlapCircleAll(entity.position + _localOffset, _radius, _colliderCache, collidesWithLayers);
// compute the visibility mesh
_visibility.begin(entity.transform.position + _localOffset, _radius);
for (var i = 0; i < totalOverlaps; i++)
{
if (!_colliderCache[i].isTrigger)
{
_visibility.addSquareOccluder(_colliderCache[i].bounds);
}
}
System.Array.Clear(_colliderCache, 0, totalOverlaps);
// generate a triangle list from the encounter points
var encounters = _visibility.end();
generateVertsFromEncounters(encounters);
ListPool <Vector2> .free(encounters);
Core.graphicsDevice.BlendState = BlendState.Additive;
Core.graphicsDevice.RasterizerState = RasterizerState.CullNone;
// wireframe debug
//var rasterizerState = new RasterizerState();
//rasterizerState.FillMode = FillMode.WireFrame;
//rasterizerState.CullMode = CullMode.None;
//Core.graphicsDevice.RasterizerState = rasterizerState;
// Apply the effect
_lightEffect.Parameters["viewProjectionMatrix"].SetValue(entity.scene.camera.viewProjectionMatrix);
_lightEffect.Parameters["lightSource"].SetValue(entity.transform.position);
_lightEffect.Parameters["lightColor"].SetValue(color.ToVector3() * power);
_lightEffect.Techniques[0].Passes[0].Apply();
var primitiveCount = _vertices.length / 2;
Core.graphicsDevice.DrawUserIndexedPrimitives(PrimitiveType.TriangleList, _vertices.buffer, 0, _vertices.length, _indices.buffer, 0, primitiveCount);
}
}
