private void CastShadow(SceneNodeBase sceneNodeBase, ShadowMappingCastShadowEventArgs arg)
{
if (sceneNodeBase != null)
{
var node = sceneNodeBase as ISupportShadowMapping;
TwoFlags flags = (node != null) ? node.EnableShadowMapping : TwoFlags.None;
bool before = (node != null) && ((flags & TwoFlags.BeforeChildren) == TwoFlags.BeforeChildren);
bool children = (node == null) || ((flags & TwoFlags.Children) == TwoFlags.Children);
if (before)
{
flags = node.EnableCastShadow;
before = (flags & TwoFlags.BeforeChildren) == TwoFlags.BeforeChildren;
}
if (children)
{
flags = (node != null) ? node.EnableCastShadow : TwoFlags.None;
children = (node == null) || ((flags & TwoFlags.Children) == TwoFlags.Children);
}
if (before)
{
node.CastShadow(arg);
}
if (children)
{
foreach (var item in sceneNodeBase.Children)
{
CastShadow(item, arg);
}
}
}
}
public void CastShadow(ShadowMappingCastShadowEventArgs arg)
{
if (!this.IsInitialized)
{
this.Initialize();
}
LightBase light = arg.Light;
mat4 projection = light.GetProjectionMatrix();
mat4 view = light.GetViewMatrix();
mat4 model = this.GetModelMatrix();
var method = this.RenderUnit.Methods[0]; // shadowmapBuilder
ShaderProgram program = method.Program;
program.SetUniform(mvpMatrix, projection * view * model);
method.Render();
}
private void LightTheScene(LightBase light, Scene scene, ActionParams param)
{
// cast shadow from specified light.
{
this.lightEquipment.Begin(param.Viewport);
var arg = new ShadowMappingCastShadowEventArgs(light);
//this.colorMask.On();
CastShadow(scene.RootNode, arg);
//this.colorMask.Off();
this.lightEquipment.End();
}
// light up the scene with specified light.
{
var arg = new ShadowMappingUnderLightEventArgs(param, scene.Camera, this.lightEquipment.BindingTexture, light);
this.blend.On();
RenderUnderLight(this.scene.RootNode, arg);
this.blend.Off();
}
}