Enum TextBlend 

pub enum TextBlend {
    Average,
    Add,
    Subtract,
    AddQuarter,
}

GPU semi-transparency equation for FontAtlas::draw_text_blended.

The PSX blends a semi-transparent primitive against the framebuffer with one of four fixed equations. The choice is not per-primitive: the primitive only carries a “blend me” bit, and the equation comes from the two-bit ABR field of the current GP0(E1h) draw mode. These are the same four the rest of the SDK exposes as psx_gpu::BlendMode, restated here so the font crate does not take a dependency on the primitive layer to name two bits.

Variants

Average

(background + foreground) / 2. A fixed 50% wash; the tint still recolours, but it cannot fade a glyph away – at tint zero the glyph still halves whatever is behind it.

Add

background + foreground, clamped per channel. The mode to reach for when text has to fade: scaling the tint toward black scales the contribution toward nothing, so the glyph dissolves instead of darkening. Reads as emissive, which suits HUD and combat text.

Subtract

background - foreground, clamped per channel. Darkens whatever is behind the glyph, so it works as a drop shadow over a light background as well as a dark one.

AddQuarter

background + foreground / 4, clamped per channel. A quarter- strength Self::Add for a subtler glow.

Implementations

impl TextBlend

pub const fn semi_transparency_bits(self) -> u8

The two-bit draw-mode semi-transparency (“ABR”) field selecting this equation.

Trait Implementations

impl Clone for TextBlend

fn clone(&self) -> TextBlend

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextBlend

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

Formats the value using the given formatter.

impl PartialEq for TextBlend

fn eq(&self, other: &TextBlend) -> 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 Copy for TextBlend

impl Eq for TextBlend

impl StructuralPartialEq for TextBlend