/// <summary>
/// Renders the cubemap in one pass using a geometry shader.
/// </summary>
/// <param name="context">The render context.</param>
/// <param name="entity">The entity the cubemap is attached to.</param>
/// <param name="component">The CubemapSource component.</param>
private void RenderInSinglePass(RenderContext context, Entity entity, CubemapSourceComponent component)
{
var cameraPos = component.Entity.Transformation.Translation;
for (var i = 0; i < 6; ++i)
{
Matrix worldToCamera;
Matrix projection;
ComputeViewProjectionMatrices(cameraPos, TargetPositions[i], CameraUps[i], component, out worldToCamera, out projection);
cameraViewProjMatrices[i] = worldToCamera * projection;
}
// TODO: set parameters on another collection?
GraphicsDevice.Parameters.Set(CameraCubeKeys.CameraViewProjectionMatrices, cameraViewProjMatrices);
GraphicsDevice.Parameters.Set(CameraCubeKeys.CameraWorldPosition, cameraPos);
if (component.RenderTarget == null)
{
component.CreateFullViewRenderTarget();
}
GraphicsDevice.Clear(component.DepthStencil, DepthStencilClearOptions.DepthBuffer);
GraphicsDevice.Clear(component.RenderTarget, Color.Black);
GraphicsDevice.SetRenderTargets(component.DepthStencil, component.RenderTarget);
base.OnRendering(context);
GraphicsDevice.SetRenderTarget(GraphicsDevice.DepthStencilBuffer, GraphicsDevice.BackBuffer);
GraphicsDevice.Parameters.Remove(CameraCubeKeys.CameraViewProjectionMatrices);
GraphicsDevice.Parameters.Remove(CameraCubeKeys.CameraWorldPosition);
}
/// <summary>
/// Renders the cubemap in 6 passes, one for each face.
/// </summary>
/// <param name="context">The render context.</param>
/// <param name="entity">The entity the cubemap is attached to.</param>
/// <param name="component">The CubemapSource component.</param>
private void RenderInSixPasses(RenderContext context, Entity entity, CubemapSourceComponent component)
{
var cameraPos = entity.Transformation.Translation;
for (var i = 0; i < 6; ++i)
{
Matrix worldToCamera;
Matrix projection;
ComputeViewProjectionMatrices(cameraPos, TargetPositions[i], CameraUps[i], component, out worldToCamera, out projection);
// TODO: set parameters on another collection?
GraphicsDevice.Parameters.Set(TransformationKeys.View, worldToCamera);
GraphicsDevice.Parameters.Set(TransformationKeys.Projection, projection);
GraphicsDevice.Parameters.Set(CameraKeys.NearClipPlane, component.NearPlane);
GraphicsDevice.Parameters.Set(CameraKeys.FarClipPlane, component.FarPlane);
GraphicsDevice.Parameters.Set(CameraKeys.FieldOfView, MathUtil.PiOverTwo);
GraphicsDevice.Parameters.Set(CameraKeys.Aspect, 1);
if (component.RenderTargets == null)
{
component.CreateSingleViewRenderTargets();
}
var renderTarget = component.RenderTargets[i];
GraphicsDevice.Clear(component.DepthStencil, DepthStencilClearOptions.DepthBuffer);
GraphicsDevice.Clear(renderTarget, Color.Black);
GraphicsDevice.SetRenderTargets(component.DepthStencil, renderTarget);
// TODO: flip face culling
base.OnRendering(context);
}
GraphicsDevice.SetRenderTarget(GraphicsDevice.DepthStencilBuffer, GraphicsDevice.BackBuffer);
GraphicsDevice.Parameters.Remove(TransformationKeys.View);
GraphicsDevice.Parameters.Remove(TransformationKeys.Projection);
GraphicsDevice.Parameters.Remove(CameraKeys.NearClipPlane);
GraphicsDevice.Parameters.Remove(CameraKeys.FarClipPlane);
GraphicsDevice.Parameters.Remove(CameraKeys.FieldOfView);
GraphicsDevice.Parameters.Remove(CameraKeys.Aspect);
GraphicsDevice.Parameters.Remove(CameraKeys.FocusDistance);
}
private static void ComputeViewProjectionMatrices(Vector3 position, Vector3 faceOffset, Vector3 up, CubemapSourceComponent source, out Matrix viewMatrix, out Matrix projection)
{
viewMatrix = Matrix.LookAtRH(position, position + faceOffset, up);
Matrix.PerspectiveFovRH(MathUtil.PiOverTwo, 1, source.NearPlane, source.FarPlane, out projection);
}