public void Render(Light light)
{
LightVaos vaos = GetVaosForLight(light);
if (!vaos.Enabled)
{
return;
}
_engine.Device.RasterizerState = _engine.Rs;
_engine.Device.DepthStencilState = DepthStencilState.None;
_engine.Device.DepthStencilState = light.ShadowType == ShadowType.Occluded
? _dsOccludedShadow
: DepthStencilState.None;
if (light.CastsShadows)
{
_fxShadowParamLightPosition.SetValue(light.Position);
_fxShadowParamLightRadius.SetValue(light.Radius);
// Draw shadows.
DynamicVao shadowVao = vaos.ShadowVao;
_engine.Device.BlendState = _bsShadow;
_engine.Device.SetVertexArrayObject(shadowVao);
_fxShadowTech.Passes[0].Apply();
_engine.Device.DrawIndexedPrimitives(shadowVao.PrimitiveTopology, 0, 0, shadowVao.PrimitiveCount);
// Draw shadows borders if debugging.
if (_engine.Debug)
{
_engine.Device.RasterizerState = _engine.RsDebug;
_engine.Device.BlendState = BlendState.Opaque;
_fxShadowTechDebug.Passes[0].Apply();
_engine.Device.DrawIndexedPrimitives(shadowVao.PrimitiveTopology, 0, 0, shadowVao.PrimitiveCount);
}
}
// Draw hulls.
bool isShadowTypeSolid = light.ShadowType == ShadowType.Solid;
if (light.CastsShadows || isShadowTypeSolid)
{
if (light.ShadowType == ShadowType.Occluded)
{
_engine.Device.DepthStencilState = _dsOccludedHull;
}
DynamicVao hullVao = vaos.HullVao;
_engine.Device.RasterizerState = _engine.Rs;
_engine.Device.BlendState = _bsHull;
_fxHullParamVp.SetValue(_engine.Camera.ViewProjection);
_fxHullParamColor.SetValue(isShadowTypeSolid ? TransparentColor : WhiteColor);
_engine.Device.SetVertexArrayObject(hullVao);
_fxHullTech.Passes[0].Apply();
_engine.Device.DrawIndexedPrimitives(hullVao.PrimitiveTopology, 0, 0, hullVao.PrimitiveCount);
}
}
private LightVaos GetVaosForLight(Light light)
{
if (!_lightsVaos.TryGetValue(light, out LightVaos lightVaos))
{
lightVaos = new LightVaos();
_lightsVaos[light] = lightVaos;
}
if (light.Dirty || _engine.Hulls.Dirty)
{
BuildVaosForLight(light, lightVaos);
}
return(lightVaos);
}
private void BuildVaosForLight(Light light, LightVaos lightVaos)
{
_hullVertices.Clear();
_shadowVertices.Clear();
_shadowIndices.Clear();
_hullIndices.Clear();
int numSegments = 0;
int shadowIndexOffset = 0;
int hullIndexOffset = 0;
int hullCount = _engine.Hulls.Count;
for (int i = 0; i < hullCount; i++)
{
Hull hull = _engine.Hulls[i];
if (!hull.Enabled ||
!hull.Valid ||
light.IgnoredHulls.Contains(hull) ||
!light.Intersects(hull))
{
continue;
}
Polygon points = hull.WorldPoints;
Vector2 prevPoint = points.Items[points.Count - 1];
int pointCount = points.Count;
numSegments += pointCount;
for (int j = 0; j < pointCount; j++)
{
Vector2 currentPoint = points.Items[j];
_shadowVertices.Add(new VertexShadow(prevPoint, currentPoint, new Vector2(0.0f, 0.0f)));
_shadowVertices.Add(new VertexShadow(prevPoint, currentPoint, new Vector2(1.0f, 0.0f)));
_shadowVertices.Add(new VertexShadow(prevPoint, currentPoint, new Vector2(0.0f, 1.0f)));
_shadowVertices.Add(new VertexShadow(prevPoint, currentPoint, new Vector2(1.0f, 1.0f)));
_shadowIndices.Add(shadowIndexOffset * 4 + 0);
_shadowIndices.Add(shadowIndexOffset * 4 + 1);
_shadowIndices.Add(shadowIndexOffset * 4 + 2);
_shadowIndices.Add(shadowIndexOffset * 4 + 1);
_shadowIndices.Add(shadowIndexOffset * 4 + 3);
_shadowIndices.Add(shadowIndexOffset * 4 + 2);
prevPoint = currentPoint;
shadowIndexOffset++;
}
_hullVertices.AddRange(hull.WorldPoints);
int indexCount = hull.Indices.Count;
for (int j = 0; j < indexCount; j++)
{
_hullIndices.Add(hull.Indices.Items[j] + hullIndexOffset);
}
hullIndexOffset += pointCount;
}
lightVaos.Enabled = numSegments > 0;
if (!lightVaos.Enabled)
{
return;
}
if (lightVaos.ShadowVao == null)
{
lightVaos.ShadowVao = DynamicVao.New(
_engine.Device,
VertexShadow.Layout,
PrimitiveType.TriangleList,
_shadowVertices.Count,
_shadowIndices.Count,
useIndices: true);
lightVaos.HullVao = DynamicVao.New(
_engine.Device,
VertexPosition2.Layout,
PrimitiveType.TriangleList,
_hullVertices.Count,
_hullIndices.Count,
useIndices: true);
}
lightVaos.ShadowVao.SetVertices(_shadowVertices);
lightVaos.ShadowVao.SetIndices(_shadowIndices);
lightVaos.HullVao.SetVertices(_hullVertices);
lightVaos.HullVao.SetIndices(_hullIndices);
}
