Struct GpuConfig 

#[repr(C, align(16))]
pub struct GpuConfig {
    pub width: u32,
    pub height: u32,
    pub strip_height: u32,
    pub alphas_tex_width_bits: u32,
    pub encoded_paints_tex_width_bits: u32,
    pub strip_offset_x: i32,
    pub strip_offset_y: i32,
    pub negate_ndc: u32,
}

The uniform block the strip shaders read once per draw.

Laid out to match the reference renderer’s Config byte for byte: eight 4-byte scalars in a 16-byte-aligned block.

Fields

width: u32

Width of the render target in pixels.

height: u32

Height of the render target in pixels.

strip_height: u32

Height of one strip in pixels — always Tile::HEIGHT.

alphas_tex_width_bits: u32

log2 of the alpha texture’s width in texels.

Pre-computed on the CPU because a downlevel (GLES 3.0 / WebGL2) target has no firstTrailingBit; the shader shifts by this instead of dividing.

encoded_paints_tex_width_bits: u32

log2 of the encoded-paint texture’s width in texels, pre-computed for the same reason as Self::alphas_tex_width_bits.

strip_offset_x: i32

Horizontal offset applied to every strip, in pixels.

strip_offset_y: i32

Vertical offset applied to every strip, in pixels.

negate_ndc: u32

Whether the shader negates the y component of its NDC position (non-zero) or leaves it alone (zero).

Kept for a future GLSL/WebGL backend: transpiling WGSL to GLSL applies a y-flip to reconcile WebGPU’s y-down clip space with a WebGL framebuffer’s y-up one. Rendering straight into a caller-provided framebuffer wants that flip undone rather than a second framebuffer allocated and blitted, and the rest of the strip pipeline (slot textures included) assumes y-down throughout. Every backend this crate drives today leaves it zero.

Implementations

impl GpuConfig

pub const SIZE: u64

The uniform’s size in bytes, for a buffer binding’s min_binding_size.

pub fn new( width: u32, height: u32, alphas_tex_width: u32, encoded_paints_tex_width: u32, ) -> Self

A config for a width x height target sampling resource textures alphas_tex_width and encoded_paints_tex_width texels wide, with no strip offset and no NDC negation.

Both texture widths must be powers of two: the shader reconstructs them as 1 << bits (see tex_width_bits).

pub const fn with_strip_offset(self, x: i32, y: i32) -> Self

The same config with strips offset by (x, y) pixels.

pub const fn with_negate_ndc(self, negate: bool) -> Self

The same config with NDC y negation switched on or off (Self::negate_ndc).

Trait Implementations

impl Clone for GpuConfig

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for GpuConfig

impl Debug for GpuConfig

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

Formats the value using the given formatter.

impl Pod for GpuConfig

impl Zeroable for GpuConfig

fn zeroed() -> Self

Calls zeroed.