/// <summary>
/// Draw each individual point lights
/// </summary>
/// <param name="light"></param>
/// <param name="cameraOrigin"></param>
private void DrawPointLight(PointLight light, Vector3 cameraOrigin, int vertexOffset, int startIndex, int primitiveCount)
{
if (!light.IsEnabled)
{
return;
}
//first let's check if the light is even in bounds
if (_boundingFrustum.Contains(light.BoundingSphere) == ContainmentType.Disjoint ||
!_boundingFrustum.Intersects(light.BoundingSphere))
{
return;
}
//For our stats
GameStats.LightsDrawn++;
//Send the light parameters to the shader
if (_viewProjectionHasChanged)
{
light.LightViewSpace = light.WorldMatrix * _view;
light.LightWorldViewProj = light.WorldMatrix * _viewProjection;
}
Shaders.deferredPointLightParameter_WorldView.SetValue(light.LightViewSpace);
Shaders.deferredPointLightParameter_WorldViewProjection.SetValue(light.LightWorldViewProj);
Shaders.deferredPointLightParameter_LightPosition.SetValue(light.LightViewSpace.Translation);
Shaders.deferredPointLightParameter_LightColor.SetValue(light.ColorV3);
Shaders.deferredPointLightParameter_LightRadius.SetValue(light.Radius);
Shaders.deferredPointLightParameter_LightIntensity.SetValue(light.Intensity);
//Compute whether we are inside or outside and use
float cameraToCenter = Vector3.Distance(cameraOrigin, light.Position);
int inside = cameraToCenter < light.Radius * 1.2f ? 1 : -1;
Shaders.deferredPointLightParameter_Inside.SetValue(inside);
if (GameSettings.g_UseDepthStencilLightCulling == 2)
{
_graphicsDevice.DepthStencilState = _stencilCullPass1;
//draw front faces
_graphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
Shaders.deferredPointLightWriteStencil.Passes[0].Apply();
_graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, vertexOffset, startIndex, primitiveCount);
////////////
_graphicsDevice.DepthStencilState = _stencilCullPass2;
//draw backfaces
_graphicsDevice.RasterizerState = RasterizerState.CullClockwise;
light.ApplyShader(_inverseView);
_graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, vertexOffset, startIndex, primitiveCount);
}
else
{
//If we are inside compute the backfaces, otherwise frontfaces of the sphere
_graphicsDevice.RasterizerState = inside > 0 ? RasterizerState.CullClockwise : RasterizerState.CullCounterClockwise;
light.ApplyShader(_inverseView);
_graphicsDevice.DepthStencilState = GameSettings.g_UseDepthStencilLightCulling > 0 && !light.IsVolumetric && inside < 0 ? DepthStencilState.DepthRead : DepthStencilState.None;
_graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, vertexOffset, startIndex, primitiveCount);
}
//Draw the sphere
}