Struct UiDrawCallDescriptor 

pub struct UiDrawCallDescriptor {

    pub element_type: UiElementType,
    pub position: Vec2,
    pub size: Vec2,
    pub corner_radii: Vec4,
    pub border_width: f32,
    pub border_color: Vec4,
    pub fill_color: Vec4,
    pub gradient: GradientDescriptor,
    pub atlas_texture_id: Id<AtlasTextureDescriptor>,
    pub atlas_descriptor_id: Id<AtlasDescriptor>,
    pub clip_rect: Vec4,
    pub opacity: f32,
    pub z: f32,
}

Describes a single 2D UI element on the GPU.

This is the per-instance data stored in the GPU slab. The vertex shader reads this to generate quad corners, and the fragment shader reads it to evaluate SDF shapes, gradients, textures, etc.

Fields

element_type: UiElementType

The type of element (Rectangle, Circle, Ellipse, Image, TextGlyph, Path).

position: Vec2

Position of the element’s top-left corner in screen space.

size: Vec2

Size of the element in screen pixels (width, height).

corner_radii: Vec4

Per-corner radii for rounded rectangles (top-left, top-right, bottom-right, bottom-left).

border_width: f32

Border width in pixels. 0 means no border.

border_color: Vec4

Border color (RGBA).

fill_color: Vec4

Fill color (RGBA). Used when gradient_type is None.

gradient: GradientDescriptor

Gradient fill descriptor.

atlas_texture_id: Id<AtlasTextureDescriptor>

ID of the atlas texture descriptor on the slab.

For Image and TextGlyph elements: points to an AtlasTextureDescriptor. For Path elements: when not Id::NONE, points to an AtlasTextureDescriptor for image-filled paths. Set to Id::NONE when unused.

atlas_descriptor_id: Id<AtlasDescriptor>

ID of the atlas descriptor on the slab.

For Path elements: repurposed to store the slab offset of the first UiVertex (via Id::new(offset)). Set to Id::NONE when unused.

clip_rect: Vec4

Scissor/clip rectangle (x, y, width, height). Reserved for future use — not currently enforced by the shader or renderer. Set to (0, 0, viewport_w, viewport_h) by default.

opacity: f32

Element opacity (0.0 = fully transparent, 1.0 = fully opaque). Multiplied with the final alpha.

z: f32

Z-depth for sorting (painter’s algorithm). Lower values are drawn first (further back).

Trait Implementations

impl Clone for UiDrawCallDescriptor

fn clone(&self) -> UiDrawCallDescriptor

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for UiDrawCallDescriptor

impl Debug for UiDrawCallDescriptor

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for UiDrawCallDescriptor

fn default() -> UiDrawCallDescriptor

Returns the “default value” for a type.

impl PartialEq for UiDrawCallDescriptor

fn eq(&self, other: &UiDrawCallDescriptor) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl SlabItem for UiDrawCallDescriptor

where UiElementType: SlabItem, Vec2: SlabItem, Vec4: SlabItem, f32: SlabItem, GradientDescriptor: SlabItem, Id<AtlasTextureDescriptor>: SlabItem, Id<AtlasDescriptor>: SlabItem,

const SLAB_SIZE: usize

The number of u32s this type occupies in a slab of &[u32].

fn read_slab(index: usize, slab: &[u32]) -> Self

Read the type out of the slab at index.

fn write_slab(&self, index: usize, slab: &mut [u32]) -> usize

Write the type into the slab at starting index and return the new index.

impl StructuralPartialEq for UiDrawCallDescriptor