1 files changed, 66 insertions, 0 deletions
diff --git a/src/pipeline/graphics/discard_rectangle.rs b/src/pipeline/graphics/discard_rectangle.rs
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+++ b/src/pipeline/graphics/discard_rectangle.rs
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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.
+
+//! A test to discard pixels that would be written to certain areas of a framebuffer.
+//!
+//! The discard rectangle test is similar to, but separate from the scissor test.
+
+use crate::{
+    macros::vulkan_enum,
+    pipeline::{graphics::viewport::Scissor, PartialStateMode},
+};
+
+/// The state in a graphics pipeline describing how the discard rectangle test should behave.
+#[derive(Clone, Debug)]
+pub struct DiscardRectangleState {
+    /// Sets whether the discard rectangle test operates inclusively or exclusively.
+    pub mode: DiscardRectangleMode,
+
+    /// Specifies the discard rectangles. If set to `Dynamic`, it specifies only the number of
+    /// rectangles used from the dynamic state.
+    ///
+    /// If set to `Dynamic` or to `Fixed` with a non-empty list, the
+    /// [`ext_discard_rectangles`](crate::device::DeviceExtensions::ext_discard_rectangles)
+    /// extension must be enabled on the device.
+    pub rectangles: PartialStateMode<Vec<Scissor>, u32>,
+}
+
+impl DiscardRectangleState {
+    /// Creates a `DiscardRectangleState` in exclusive mode with zero rectangles.
+    #[inline]
+    pub fn new() -> Self {
+        Self {
+            mode: DiscardRectangleMode::Exclusive,
+            rectangles: PartialStateMode::Fixed(Vec::new()),
+        }
+    }
+}
+
+impl Default for DiscardRectangleState {
+    /// Returns [`DiscardRectangleState::new`].
+    #[inline]
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+vulkan_enum! {
+    #[non_exhaustive]
+
+    /// The mode in which the discard rectangle test operates.
+    DiscardRectangleMode = DiscardRectangleModeEXT(i32);
+
+    /// Samples that are inside a rectangle are kept, samples that are outside all rectangles
+    /// are discarded.
+    Inclusive = INCLUSIVE,
+
+    /// Samples that are inside a rectangle are discarded, samples that are outside all rectangles
+    /// are kept.
+    Exclusive = EXCLUSIVE,
+}