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// Copyright (c) 2016 The vulkano developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or https://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.
//! Configures the operation of the depth, stencil and depth bounds tests.
//!
//! The depth test passes of fails depending on how the depth value of each fragment compares
//! to the existing depth value in the depth buffer at that fragment's location. Depth values
//! are always between 0.0 and 1.0.
//!
//! The depth bounds test allows you to ask the GPU to exclude fragments that are outside of a
//! certain range. This is done in addition to the regular depth test.
//!
//! The stencil test passes or fails depending on how a reference value compares to the existing
//! value in the stencil buffer at each fragment's location. Depending on the outcome of the
//! depth and stencil tests, the value of the stencil buffer at that location can be updated.
use crate::{macros::vulkan_enum, pipeline::StateMode};
use std::ops::RangeInclusive;
/// The state in a graphics pipeline describing how the depth, depth bounds and stencil tests
/// should behave.
#[derive(Clone, Debug)]
pub struct DepthStencilState {
/// The state of the depth test.
///
/// If set to `None`, the depth test is disabled, all fragments will pass and no depth writes
/// are performed.
pub depth: Option<DepthState>,
/// The state of the depth bounds test.
///
/// If set to `None`, the depth bounds test is disabled, all fragments will pass.
pub depth_bounds: Option<DepthBoundsState>,
/// The state of the stencil test.
///
/// If set to `None`, the stencil test is disabled, all fragments will pass and no stencil
/// writes are performed.
pub stencil: Option<StencilState>,
}
impl DepthStencilState {
/// Creates a `DepthStencilState` where all tests are disabled and have no effect.
#[inline]
pub fn disabled() -> Self {
Self {
depth: Default::default(),
depth_bounds: Default::default(),
stencil: Default::default(),
}
}
/// Creates a `DepthStencilState` with a `Less` depth test, `depth_write` set to true, and other
/// tests disabled.
#[inline]
pub fn simple_depth_test() -> Self {
Self {
depth: Some(DepthState {
enable_dynamic: false,
compare_op: StateMode::Fixed(CompareOp::Less),
write_enable: StateMode::Fixed(true),
}),
depth_bounds: Default::default(),
stencil: Default::default(),
}
}
}
impl Default for DepthStencilState {
/// Returns [`DepthStencilState::disabled()`].
#[inline]
fn default() -> Self {
DepthStencilState::disabled()
}
}
/// The state in a graphics pipeline describing how the depth test should behave when enabled.
#[derive(Clone, Copy, Debug)]
pub struct DepthState {
/// Sets whether depth testing should be enabled and disabled dynamically. If set to `false`,
/// depth testing is always enabled.
///
/// If set to `true`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state`](crate::device::Features::extended_dynamic_state) feature must be
/// enabled on the device.
pub enable_dynamic: bool,
/// Sets whether the value in the depth buffer will be updated when the depth test succeeds.
///
/// If set to `Dynamic`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state`](crate::device::Features::extended_dynamic_state) feature must be
/// enabled on the device.
pub write_enable: StateMode<bool>,
/// Comparison operation to use between the depth value of each incoming fragment and the depth
/// value currently in the depth buffer.
///
/// If set to `Dynamic`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state`](crate::device::Features::extended_dynamic_state) feature must be
/// enabled on the device.
pub compare_op: StateMode<CompareOp>,
}
impl Default for DepthState {
/// Creates a `DepthState` with no dynamic state, depth writes disabled and `compare_op` set
/// to always pass.
#[inline]
fn default() -> Self {
Self {
enable_dynamic: false,
write_enable: StateMode::Fixed(false),
compare_op: StateMode::Fixed(CompareOp::Always),
}
}
}
/// The state in a graphics pipeline describing how the depth bounds test should behave when
/// enabled.
#[derive(Clone, Debug)]
pub struct DepthBoundsState {
/// Sets whether depth bounds testing should be enabled and disabled dynamically. If set to
/// `false`, depth bounds testing is always enabled.
///
/// If set to `true`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state`](crate::device::Features::extended_dynamic_state) feature must be
/// enabled on the device.
pub enable_dynamic: bool,
/// The minimum and maximum depth values to use for the test. Fragments with values outside this
/// range are discarded.
///
/// If set to `Dynamic`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state`](crate::device::Features::extended_dynamic_state) feature must be
/// enabled on the device.
pub bounds: StateMode<RangeInclusive<f32>>,
}
impl Default for DepthBoundsState {
/// Creates a `DepthBoundsState` with no dynamic state and the bounds set to `0.0..=1.0`.
#[inline]
fn default() -> Self {
Self {
enable_dynamic: false,
bounds: StateMode::Fixed(0.0..=1.0),
}
}
}
/// The state in a graphics pipeline describing how the stencil test should behave when enabled.
///
/// Dynamic state can only be enabled or disabled for both faces at once. Therefore, the dynamic
/// state values in `StencilOpState`, must match: the values for `front` and `back` must either both
/// be `Fixed` or both be `Dynamic`.
#[derive(Clone, Debug)]
pub struct StencilState {
/// Sets whether stencil testing should be enabled and disabled dynamically. If set to
/// `false`, stencil testing is always enabled.
///
/// If set to `true`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state`](crate::device::Features::extended_dynamic_state) feature must be
/// enabled on the device.
pub enable_dynamic: bool,
/// The stencil operation state to use for points and lines, and for triangles whose front is
/// facing the user.
pub front: StencilOpState,
/// The stencil operation state to use for triangles whose back is facing the user.
pub back: StencilOpState,
}
/// Stencil test operations for a single face.
#[derive(Clone, Copy, Debug)]
pub struct StencilOpState {
/// The stencil operations to perform.
///
/// If set to `Dynamic`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state`](crate::device::Features::extended_dynamic_state) feature must be
/// enabled on the device.
pub ops: StateMode<StencilOps>,
/// A bitmask that selects the bits of the unsigned integer stencil values participating in the
/// stencil test. Ignored if `compare_op` is `Never` or `Always`.
pub compare_mask: StateMode<u32>,
/// A bitmask that selects the bits of the unsigned integer stencil values updated by the
/// stencil test in the stencil framebuffer attachment. Ignored if the relevant operation is
/// `Keep`.
pub write_mask: StateMode<u32>,
/// Reference value that is used in the unsigned stencil comparison. The stencil test is
/// considered to pass if the `compare_op` between the stencil buffer value and this reference
/// value yields true.
pub reference: StateMode<u32>,
}
impl Default for StencilOpState {
/// Creates a `StencilOpState` with no dynamic state, `compare_op` set to `Never`, the stencil
/// operations set to `Keep`, and the masks and reference values set to `u32::MAX`.
#[inline]
fn default() -> StencilOpState {
StencilOpState {
ops: StateMode::Fixed(Default::default()),
compare_mask: StateMode::Fixed(u32::MAX),
write_mask: StateMode::Fixed(u32::MAX),
reference: StateMode::Fixed(u32::MAX),
}
}
}
#[derive(Clone, Copy, Debug)]
pub struct StencilOps {
/// The operation to perform when the stencil test failed.
pub fail_op: StencilOp,
/// The operation to perform when both the depth test and the stencil test passed.
pub pass_op: StencilOp,
/// The operation to perform when the stencil test passed but the depth test failed.
pub depth_fail_op: StencilOp,
/// The comparison to perform between the existing stencil value in the stencil buffer, and
/// the reference value (given by `reference`).
pub compare_op: CompareOp,
}
impl Default for StencilOps {
/// Creates a `StencilOps` with no dynamic state, `compare_op` set to `Never` and the stencil
/// operations set to `Keep`.
#[inline]
fn default() -> Self {
Self {
pass_op: StencilOp::Keep,
fail_op: StencilOp::Keep,
depth_fail_op: StencilOp::Keep,
compare_op: CompareOp::Never,
}
}
}
vulkan_enum! {
/// Operation to perform after the depth and stencil tests.
#[non_exhaustive]
StencilOp = StencilOp(i32);
// TODO: document
Keep = KEEP,
// TODO: document
Zero = ZERO,
// TODO: document
Replace = REPLACE,
// TODO: document
IncrementAndClamp = INCREMENT_AND_CLAMP,
// TODO: document
DecrementAndClamp = DECREMENT_AND_CLAMP,
// TODO: document
Invert = INVERT,
// TODO: document
IncrementAndWrap = INCREMENT_AND_WRAP,
// TODO: document
DecrementAndWrap = DECREMENT_AND_WRAP,
}
vulkan_enum! {
/// Specifies a face for stencil operations.
#[non_exhaustive]
StencilFaces = StencilFaceFlags(u32);
// TODO: document
Front = FRONT,
// TODO: document
Back = BACK,
// TODO: document
FrontAndBack = FRONT_AND_BACK,
}
/// Specifies a dynamic state value for the front and back faces.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct DynamicStencilValue {
pub front: u32,
pub back: u32,
}
vulkan_enum! {
/// Specifies how two values should be compared to decide whether a test passes or fails.
///
/// Used for both depth testing and stencil testing.
#[non_exhaustive]
CompareOp = CompareOp(i32);
/// The test never passes.
Never = NEVER,
/// The test passes if `value < reference_value`.
Less = LESS,
/// The test passes if `value == reference_value`.
Equal = EQUAL,
/// The test passes if `value <= reference_value`.
LessOrEqual = LESS_OR_EQUAL,
/// The test passes if `value > reference_value`.
Greater = GREATER,
/// The test passes if `value != reference_value`.
NotEqual = NOT_EQUAL,
/// The test passes if `value >= reference_value`.
GreaterOrEqual = GREATER_OR_EQUAL,
/// The test always passes.
Always = ALWAYS,
}