public void GenerateShadowMaps(GraphicsContext ctx, SceneGraph sceneGraph)
{
if (sceneGraph == null)
{
throw new ArgumentNullException("sceneGraph");
}
// Push current viewport to be restore later
State.ViewportState currentViewport = new State.ViewportState(ctx);
foreach (SceneObjectLight sceneLight in ShadowLights)
{
using (SceneGraph shadowGraph = new SceneGraph(sceneGraph,
//SceneGraphFlags.CullingViewFrustum | SceneGraphFlags.StateSorting
SceneGraphFlags.None
))
{
shadowGraph.SceneRoot.ObjectState.DefineState(new State.CullFaceState(CullFaceMode.Back));
sceneLight.UpdateShadowMap(ctx, shadowGraph);
}
}
// Restore viewport
currentViewport.Apply(ctx, null);
// Restore cull face state to default
State.CullFaceState.DefaultState.Apply(ctx, null);
}
private void DisplayShadowMaps(GraphicsContext ctx)
{
State.ViewportState viewportState = new State.ViewportState(ctx);
OrthoProjectionMatrix orthoProjection = new OrthoProjectionMatrix(0.0f, viewportState.Width, 0.0f, viewportState.Height);
ModelMatrix model = new ModelMatrix();
// No depth test
State.DepthTestState.DefaultState.Apply(ctx, null);
ctx.Bind(_ShadowMapDebugProgram);
for (int i = 0; i < _LightManager.ShadowLights.Count; i++)
{
SceneObjectLight shadowLight = _LightManager.ShadowLights[i];
SceneObjectLightSpot shadowSpotLight = shadowLight as SceneObjectLightSpot;
if (shadowSpotLight == null)
{
continue;
}
Texture2d shadowTex = shadowSpotLight._ShadowMap;
shadowTex.SamplerParams.CompareMode = false;
ModelMatrix quadModel = new ModelMatrix(model);
quadModel.Scale(shadowTex.Width / 4, shadowTex.Height / 4);
_ShadowMapDebugProgram.SetUniform(ctx, "glo_ModelViewProjection", orthoProjection * quadModel);
_ShadowMapDebugProgram.SetUniform(ctx, "glo_NearFar", new Vertex2f(0.1f, 100.0f));
_ShadowMapDebugProgram.SetUniform(ctx, "glo_Texture", shadowTex);
_ShadowMapQuad.Draw(ctx, _ShadowMapDebugProgram);
shadowTex.SamplerParams.CompareMode = true;
// Stride right
model.Translate(shadowTex.Width, 0.0f);
}
}