Enum glium::draw_parameters::BlendingFunction

pub enum BlendingFunction {
    AlwaysReplace,
    Min,
    Max,
    Addition {
        source: LinearBlendingFactor,
        destination: LinearBlendingFactor,
    },
    Subtraction {
        source: LinearBlendingFactor,
        destination: LinearBlendingFactor,
    },
    ReverseSubtraction {
        source: LinearBlendingFactor,
        destination: LinearBlendingFactor,
    },
}

Function that the GPU will use for blending.

Variants

AlwaysReplace

Simply overwrite the destination pixel with the source pixel.

The alpha channels are simply ignored. This is the default mode.

For example writing (0.5, 0.9, 0.4, 0.2) over (0.9, 0.1, 0.4, 0.3) will result in (0.5, 0.9, 0.4, 0.2).

Min

For each individual component (red, green, blue, and alpha), the minimum value is chosen between the source and the destination.

For example writing (0.5, 0.9, 0.4, 0.2) over (0.9, 0.1, 0.4, 0.3) will result in (0.5, 0.1, 0.4, 0.2).

Max

For each individual component (red, green, blue, and alpha), the maximum value is chosen between the source and the destination.

For example writing (0.5, 0.9, 0.4, 0.2) over (0.9, 0.1, 0.4, 0.3) will result in (0.9, 0.9, 0.4, 0.3).

Addition

Fields

source: LinearBlendingFactor

The factor to apply to the source pixel.

destination: LinearBlendingFactor

The factor to apply to the destination pixel.

For each individual component (red, green, blue, and alpha), a weighted addition between the source and the destination.

The result is equal to source_component * source_factor + dest_component * dest_factor, where source_factor and dest_factor are the values of source and destination of this enum.

Subtraction

Fields

source: LinearBlendingFactor

The factor to apply to the source pixel.

destination: LinearBlendingFactor

The factor to apply to the destination pixel.

For each individual component (red, green, blue, and alpha), a weighted subtraction of the source by the destination.

The result is equal to source_component * source_factor - dest_component * dest_factor, where source_factor and dest_factor are the values of source and destination of this enum.

ReverseSubtraction

Fields

source: LinearBlendingFactor

The factor to apply to the source pixel.

destination: LinearBlendingFactor

The factor to apply to the destination pixel.

For each individual component (red, green, blue, and alpha), a weighted subtraction of the destination by the source.

The result is equal to -source_component * source_factor + dest_component * dest_factor, where source_factor and dest_factor are the values of source and destination of this enum.

Trait Implementations

impl Clone for BlendingFunction

fn clone(&self) -> BlendingFunction

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BlendingFunction

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

Formats the value using the given formatter.

impl PartialEq for BlendingFunction

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for BlendingFunction

impl Eq for BlendingFunction

impl StructuralEq for BlendingFunction

impl StructuralPartialEq for BlendingFunction