// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.ui.gfx;

// These are all of the types of parameters that can be set to configure a
// |Renderer|.
union RendererParam {
    ShadowTechnique shadow_technique;
    RenderFrequency render_frequency;
};

// Represents the shadow algorithm that the |Renderer| should use when lighting
// the scene.
enum ShadowTechnique {
    // No shadows.
    UNSHADOWED = 0;
    // Default.  Screen-space, depth-buffer based shadows; SSDO-ish.
    SCREEN_SPACE = 1;
    // Basic shadow map.
    SHADOW_MAP = 2;
    // Moment shadow map (see http://momentsingraphics.de).
    MOMENT_SHADOW_MAP = 3;
    // Stencil shadow volume.
    STENCIL_SHADOW_VOLUME = 4;
};

enum RenderFrequency {
    // Render only on when requested (i.e. when something triggers it).
    // Default behavior.
    WHEN_REQUESTED = 0;
    // Render one frame after another regardless of it it's needed.
    CONTINUOUSLY = 1;
};