private void RenderShadows(RenderTarget renderTarget, Light light, Stage stage, Camera camera, int cascadeIndex, out Matrix4 viewProjection, out Vector2 clipPlane)
{
Backend.BeginPass(renderTarget, new Vector4(0, 0, 0, 1), true);
var modelViewProjection = Matrix4.Identity;
var orientation = Vector3.GetRotationTo(Vector3.UnitY, light.Direction);
clipPlane = new Vector2(light.ShadowNearClipDistance, light.Range * 2.0f);
Matrix4 view, projection;
if (light.Type == LighType.Directional)
{
var cameraFrustum = camera.GetFrustum();
var lightDir = -light.Direction;
lightDir.Normalize();
Matrix4 lightRotation = Matrix4.LookAt(Vector3.Zero, lightDir, Vector3.UnitY);
Vector3[] corners = cameraFrustum.GetCorners();
for (var i = 0; i < corners.Length; i++)
{
corners[i] = Vector3.Transform(corners[i], lightRotation);
}
var lightBox = BoundingBox.CreateFromPoints(corners);
var boxSize = lightBox.Max - lightBox.Min;
Vector3 halfBoxSize;
Vector3.Multiply(ref boxSize, 0.5f, out halfBoxSize);
var lightPosition = lightBox.Min + halfBoxSize;
lightPosition.Z = lightBox.Min.Z;
lightPosition = Vector3.Transform(lightPosition, Matrix4.Invert(lightRotation));
view = Matrix4.LookAt(lightPosition, lightPosition - lightDir, Vector3.UnitY);
projection = Matrix4.CreateOrthographic(boxSize.X, boxSize.Y, -boxSize.Z, boxSize.Z);
clipPlane.X = -boxSize.Z;
clipPlane.Y = boxSize.Z;
}
else
{
view = Matrix4.LookAt(light.Position, light.Position + light.Direction, Vector3.UnitY);
projection = Matrix4.CreatePerspectiveFieldOfView(light.OuterAngle, renderTarget.Width / (float)renderTarget.Height, clipPlane.X, clipPlane.Y);
}
viewProjection = view * projection;
ShadowRenderOperations.Reset();
stage.PrepareRenderOperations(view, ShadowRenderOperations, true, false);
RenderOperation[] operations;
int count;
ShadowRenderOperations.GetOperations(out operations, out count);
for (var i = 0; i < count; i++)
{
var world = operations[i].WorldMatrix;
modelViewProjection = world * view * projection;
Resources.ShaderProgram program;
RenderShadowsParams shadowParams;
if (operations[i].Skeleton != null)
{
program = RenderShadowsSkinnedShader;
shadowParams = RenderShadowsSkinnedParams;
}
else
{
program = RenderShadowsShader;
shadowParams = RenderShadowsParams;
}
Backend.BeginInstance(program.Handle, null, null, ShadowsRenderState);
Backend.BindShaderVariable(shadowParams.ModelViewProjection, ref modelViewProjection);
Backend.BindShaderVariable(shadowParams.ClipPlane, ref clipPlane);
if (light.Type == LighType.Directional)
{
float shadowBias = 0.05f * (cascadeIndex + 1);
Backend.BindShaderVariable(shadowParams.ShadowBias, shadowBias);
}
if (operations[i].Skeleton != null)
{
Backend.BindShaderVariable(shadowParams.Bones, ref operations[i].Skeleton.FinalBoneTransforms);
}
Backend.DrawMesh(operations[i].MeshHandle);
Backend.EndInstance();
}
Backend.EndPass();
}
private void RenderShadowsCube(RenderTarget renderTarget, Light light, Stage stage, Camera camera, out Matrix4 viewProjection, out Vector2 clipPlane)
{
Backend.BeginPass(renderTarget, new Vector4(0, 0, 0, 1), true);
var modelViewProjection = Matrix4.Identity;
var orientation = Vector3.GetRotationTo(Vector3.UnitY, light.Direction);
clipPlane = new Vector2(light.ShadowNearClipDistance, light.Range * 2.0f);
var projection = Matrix4.CreatePerspectiveFieldOfView(OpenTK.MathHelper.DegreesToRadians(90), renderTarget.Width / (float)renderTarget.Height, clipPlane.X, clipPlane.Y);
var viewProjectionMatrices = new Matrix4[]
{
(Matrix4.CreateTranslation(-light.Position) * new Matrix4(0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, 0, 0, 0, 0, 1)) * projection,
(Matrix4.CreateTranslation(-light.Position) * new Matrix4(0, 0, 1, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1)) * projection,
(Matrix4.CreateTranslation(-light.Position) * new Matrix4(1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1)) * projection,
(Matrix4.CreateTranslation(-light.Position) * new Matrix4(1, 0, 0, 0, 0, 0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1)) * projection,
(Matrix4.CreateTranslation(-light.Position) * new Matrix4(1, 0, 0, 0, 0, -1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1)) * projection,
(Matrix4.CreateTranslation(-light.Position) * new Matrix4(-1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1)) * projection
};
viewProjection = projection;
ShadowRenderOperations.Reset();
stage.PrepareRenderOperations(light.Position, light.Range * 2, ShadowRenderOperations, true);
RenderOperation[] operations;
int count;
ShadowRenderOperations.GetOperations(out operations, out count);
for (var i = 0; i < count; i++)
{
var world = operations[i].WorldMatrix;
Resources.ShaderProgram program;
RenderShadowsParams shadowParams;
if (operations[i].Skeleton != null)
{
program = RenderShadowsSkinnedCubeShader;
shadowParams = RenderShadowsSkinnedCubeParams;
}
else
{
program = RenderShadowsCubeShader;
shadowParams = RenderShadowsCubeParams;
}
Backend.BeginInstance(program.Handle, null, null, ShadowsRenderState);
Backend.BindShaderVariable(shadowParams.Model, ref world);
Backend.BindShaderVariable(shadowParams.ClipPlane, ref clipPlane);
Backend.BindShaderVariable(shadowParams.ViewProjectionMatrices, ref viewProjectionMatrices);
Backend.BindShaderVariable(shadowParams.LightPosition, ref light.Position);
if (operations[i].Skeleton != null)
{
Backend.BindShaderVariable(shadowParams.Bones, ref operations[i].Skeleton.FinalBoneTransforms);
}
Backend.DrawMesh(operations[i].MeshHandle);
Backend.EndInstance();
}
Backend.EndPass();
}
private void RenderScene(Stage stage, Camera camera, ref Matrix4 view, ref Matrix4 projection)
{
var viewProjection = view * projection;
RenderOperations.Reset();
stage.PrepareRenderOperations(viewProjection, RenderOperations);
RenderOperation[] operations;
int count;
RenderOperations.GetOperations(out operations, out count);
Resources.Material activeMaterial = null;
Matrix4 worldView, world, itWorld, worldViewProjection;
for (var i = 0; i < count; i++)
{
world = operations[i].WorldMatrix;
Matrix4.Mult(ref world, ref viewProjection, out worldViewProjection);
Matrix4.Mult(ref world, ref view, out worldView);
itWorld = Matrix4.Transpose(Matrix4.Invert(world));
if (activeMaterial == null || activeMaterial.Id != operations[i].Material.Id)
{
operations[i].Material.BeginInstance(Backend, camera, 0);
}
operations[i].Material.BindPerObject(Backend, ref world, ref worldView, ref itWorld, ref worldViewProjection, operations[i].Skeleton);
Backend.DrawMesh(operations[i].MeshHandle);
}
}
