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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 how primitives should be converted into collections of fragments.
use crate::{macros::vulkan_enum, pipeline::StateMode};
/// The state in a graphics pipeline describing how the rasterization stage should behave.
#[derive(Clone, Debug)]
pub struct RasterizationState {
/// If true, then the depth value of the vertices will be clamped to the range [0.0, 1.0]. If
/// false, fragments whose depth is outside of this range will be discarded.
///
/// If enabled, the [`depth_clamp`](crate::device::Features::depth_clamp) feature must be
/// enabled on the device.
pub depth_clamp_enable: bool,
/// If true, all the fragments will be discarded, and the fragment shader will not be run. This
/// is usually used when your vertex shader has some side effects and you don't need to run the
/// fragment shader.
///
/// If set to `Dynamic`, the device API version must be at least 1.3, or the
/// [`extended_dynamic_state2`](crate::device::Features::extended_dynamic_state2) feature must
/// be enabled on the device.
pub rasterizer_discard_enable: StateMode<bool>,
/// This setting can ask the rasterizer to downgrade triangles into lines or points, or lines
/// into points.
///
/// If set to a value other than `Fill`, the
/// [`fill_mode_non_solid`](crate::device::Features::fill_mode_non_solid) feature must be
/// enabled on the device.
pub polygon_mode: PolygonMode,
/// Specifies whether front faces or back faces should be discarded, or none, or both.
///
/// 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 cull_mode: StateMode<CullMode>,
/// Specifies which triangle orientation is considered to be the front of the triangle.
///
/// 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 front_face: StateMode<FrontFace>,
/// Sets how to modify depth values in the rasterization stage.
///
/// If set to `None`, depth biasing is disabled, the depth values will pass to the fragment
/// shader unmodified.
pub depth_bias: Option<DepthBiasState>,
/// Width, in pixels, of lines when drawing lines.
///
/// Setting this to a value other than 1.0 requires the
/// [`wide_lines`](crate::device::Features::wide_lines) feature to be enabled on
/// the device.
pub line_width: StateMode<f32>,
/// The rasterization mode for lines.
///
/// If this is not set to `Default`, the
/// [`ext_line_rasterization`](crate::device::DeviceExtensions::ext_line_rasterization)
/// extension and an additional feature must be enabled on the device.
pub line_rasterization_mode: LineRasterizationMode,
/// Enables and sets the parameters for line stippling.
///
/// If this is set to `Some`, the
/// [`ext_line_rasterization`](crate::device::DeviceExtensions::ext_line_rasterization)
/// extension and an additional feature must be enabled on the device.
pub line_stipple: Option<StateMode<LineStipple>>,
}
impl RasterizationState {
/// Creates a `RasterizationState` with depth clamping, discard, depth biasing and line
/// stippling disabled, filled polygons, no culling, counterclockwise front face, and the
/// default line width and line rasterization mode.
#[inline]
pub fn new() -> Self {
Self {
depth_clamp_enable: false,
rasterizer_discard_enable: StateMode::Fixed(false),
polygon_mode: Default::default(),
cull_mode: StateMode::Fixed(Default::default()),
front_face: StateMode::Fixed(Default::default()),
depth_bias: None,
line_width: StateMode::Fixed(1.0),
line_rasterization_mode: Default::default(),
line_stipple: None,
}
}
/// Sets the polygon mode.
#[inline]
pub fn polygon_mode(mut self, polygon_mode: PolygonMode) -> Self {
self.polygon_mode = polygon_mode;
self
}
/// Sets the cull mode.
#[inline]
pub fn cull_mode(mut self, cull_mode: CullMode) -> Self {
self.cull_mode = StateMode::Fixed(cull_mode);
self
}
/// Sets the cull mode to dynamic.
#[inline]
pub fn cull_mode_dynamic(mut self) -> Self {
self.cull_mode = StateMode::Dynamic;
self
}
/// Sets the front face.
#[inline]
pub fn front_face(mut self, front_face: FrontFace) -> Self {
self.front_face = StateMode::Fixed(front_face);
self
}
/// Sets the front face to dynamic.
#[inline]
pub fn front_face_dynamic(mut self) -> Self {
self.front_face = StateMode::Dynamic;
self
}
}
impl Default for RasterizationState {
/// Returns [`RasterizationState::new()`].
#[inline]
fn default() -> Self {
Self::new()
}
}
/// The state in a graphics pipeline describing how depth biasing should behave when enabled.
#[derive(Clone, Copy, Debug)]
pub struct DepthBiasState {
/// Sets whether depth biasing should be enabled and disabled dynamically. If set to `false`,
/// depth biasing is always enabled.
///
/// If set to `true`, the
/// [`extended_dynamic_state2`](crate::device::Features::extended_dynamic_state2) feature must
/// be enabled on the device.
pub enable_dynamic: bool,
/// The values to use when depth biasing is enabled.
pub bias: StateMode<DepthBias>,
}
/// The values to use for depth biasing.
#[derive(Clone, Copy, Debug)]
pub struct DepthBias {
/// Specifies a constant factor to be added to every depth value.
pub constant_factor: f32,
/// The maximum (or minimum) depth bias of a fragment.
///
/// Setting this to a value other than 0.0 requires the
/// [`depth_bias_clamp`](crate::device::Features::depth_bias_clamp) feature to be enabled on
/// the device.
pub clamp: f32,
/// A scalar factor applied to a fragment's slope in depth bias calculations.
pub slope_factor: f32,
}
vulkan_enum! {
/// Specifies the culling mode.
///
/// This setting works in pair with `front_face`. The `front_face` setting tells the GPU whether
/// clockwise or counter-clockwise correspond to the front and the back of each triangle. Then
/// `cull_mode` lets you specify whether front faces should be discarded, back faces should be
/// discarded, or none, or both.
#[non_exhaustive]
CullMode = CullModeFlags(u32);
/// No culling.
None = NONE,
/// The faces facing the front of the screen (ie. facing the user) will be removed.
Front = FRONT,
/// The faces facing the back of the screen will be removed.
Back = BACK,
/// All faces will be removed.
FrontAndBack = FRONT_AND_BACK,
}
impl Default for CullMode {
#[inline]
fn default() -> CullMode {
CullMode::None
}
}
vulkan_enum! {
/// Specifies which triangle orientation corresponds to the front or the triangle.
#[non_exhaustive]
FrontFace = FrontFace(i32);
/// Triangles whose vertices are oriented counter-clockwise on the screen will be considered
/// as facing their front. Otherwise they will be considered as facing their back.
CounterClockwise = COUNTER_CLOCKWISE,
/// Triangles whose vertices are oriented clockwise on the screen will be considered
/// as facing their front. Otherwise they will be considered as facing their back.
Clockwise = CLOCKWISE,
}
impl Default for FrontFace {
#[inline]
fn default() -> FrontFace {
FrontFace::CounterClockwise
}
}
vulkan_enum! {
// TODO: document
#[non_exhaustive]
PolygonMode = PolygonMode(i32);
// TODO: document
Fill = FILL,
// TODO: document
Line = LINE,
// TODO: document
Point = POINT,
/*
// TODO: document
FillRectangle = FILL_RECTANGLE_NV {
device_extensions: [nv_fill_rectangle],
},
*/
}
impl Default for PolygonMode {
#[inline]
fn default() -> PolygonMode {
PolygonMode::Fill
}
}
vulkan_enum! {
/// The rasterization mode to use for lines.
#[non_exhaustive]
LineRasterizationMode = LineRasterizationModeEXT(i32);
/// If the [`strict_lines`](crate::device::Properties::strict_lines) device property is `true`,
/// then this is the same as `Rectangular`. Otherwise, lines are drawn as parallelograms.
///
/// If [`RasterizationState::line_stipple`] is `Some`, then the
/// [`strict_lines`](crate::device::Properties::strict_lines) property must be `true` and the
/// [`stippled_rectangular_lines`](crate::device::Features::stippled_rectangular_lines) feature
/// must be enabled on the device.
Default = DEFAULT,
/// Lines are drawn as if they were rectangles extruded from the line.
///
/// The [`rectangular_lines`](crate::device::Features::rectangular_lines) feature must be
/// enabled on the device. If [`RasterizationState::line_stipple`] is `Some`, then the
/// [`stippled_rectangular_lines`](crate::device::Features::stippled_rectangular_lines) must
/// also be enabled.
Rectangular = RECTANGULAR,
/// Lines are drawn by determining which pixel diamonds the line intersects and exits.
///
/// The [`bresenham_lines`](crate::device::Features::bresenham_lines) feature must be
/// enabled on the device. If [`RasterizationState::line_stipple`] is `Some`, then the
/// [`stippled_bresenham_lines`](crate::device::Features::stippled_bresenham_lines) must
/// also be enabled.
Bresenham = BRESENHAM,
/// As `Rectangular`, but with alpha falloff.
///
/// The [`smooth_lines`](crate::device::Features::smooth_lines) feature must be
/// enabled on the device. If [`RasterizationState::line_stipple`] is `Some`, then the
/// [`stippled_smooth_lines`](crate::device::Features::stippled_smooth_lines) must
/// also be enabled.
RectangularSmooth = RECTANGULAR_SMOOTH,
}
impl Default for LineRasterizationMode {
/// Returns `LineRasterizationMode::Default`.
fn default() -> Self {
Self::Default
}
}
/// The parameters of a stippled line.
#[derive(Clone, Copy, Debug)]
pub struct LineStipple {
/// The repeat factor used in stippled line rasterization. Must be between 1 and 256 inclusive.
pub factor: u32,
/// The bit pattern used in stippled line rasterization.
pub pattern: u16,
}