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|
use crate::CurrentContextWithFns;
pub fn configure(
current_context: &CurrentContextWithFns<'_>,
configuration: Configuration,
)
{
unsafe {
current_context.fns().BlendFunc(
configuration.source_factor.into_gl(),
configuration.destination_factor.into_gl(),
);
current_context
.fns()
.BlendEquation(configuration.equation.into_gl());
}
}
#[derive(Debug, Clone)]
pub struct Configuration
{
source_factor: Factor,
destination_factor: Factor,
equation: Equation,
}
impl Configuration
{
pub fn with_source_factor(mut self, source_factor: Factor) -> Self
{
self.source_factor = source_factor;
self
}
pub fn with_destination_factor(mut self, destination_factor: Factor) -> Self
{
self.destination_factor = destination_factor;
self
}
pub fn with_equation(mut self, equation: Equation) -> Self
{
self.equation = equation;
self
}
}
impl Default for Configuration
{
fn default() -> Self
{
Self {
source_factor: Factor::One,
destination_factor: Factor::Zero,
equation: Equation::default(),
}
}
}
#[derive(Debug, Clone, Copy)]
#[non_exhaustive]
pub enum Factor
{
/// Factor will be the RGBA color `(0,0,0,0)`
Zero,
/// Factor will be the RGBA color `(1,1,1,1)`
One,
/// Factor will be the source color
SrcColor,
/// Factor will be the RGBA color `(1,1,1,1) - source color`
OneMinusSrcColor,
/// Factor will be the destination color
DstColor,
/// Factor will be the RGBA color `(1,1,1,1) - destination color`
OneMinusDstColor,
/// Factor will be the alpha component of the source color.
SrcAlpha,
/// Factor will be the RGBA color `(1,1,1,1) - source color alpha`
OneMinusSrcAlpha,
/// Factor will be the alpha component of the destination color.
DstAlpha,
/// Factor will be the RGBA color `(1,1,1,1) - destination color alpha`
OneMinusDstAlpha,
/// Factor will be the constant color
ConstantColor,
/// Factor will be the RGBA color `(1,1,1,1) - constant color`
OneMinusConstantColor,
/// Factor will be the alpha component of the constant color.
ConstantAlpha,
/// Factor will be the RGBA color `(1,1,1,1) - constant color alpha`
OneMinusConstantAlpha,
// /// (i,i,i,1)
// SrcAlphaSaturate,
//
// /// (Rs1kR,Gs1kG,Bs1kB,As1kA)
// Src1Color,
//
// /// (1,1,1,1)−(Rs1kR,Gs1kG,Bs1kB,As1kA)
// OneMinusSrc1Color,
//
// /// (As1kA,As1kA,As1kA,As1kA)
// Src1Alpha,
//
// /// (1,1,1,1)−(As1kA,As1kA,As1kA,As1kA)
// OneMinusSrc1Alpha,
}
impl Factor
{
fn into_gl(self) -> crate::sys::types::GLenum
{
match self {
Self::Zero => crate::sys::ZERO,
Self::One => crate::sys::ONE,
Self::SrcColor => crate::sys::SRC_COLOR,
Self::OneMinusSrcColor => crate::sys::ONE_MINUS_SRC_COLOR,
Self::DstColor => crate::sys::DST_COLOR,
Self::OneMinusDstColor => crate::sys::ONE_MINUS_DST_COLOR,
Self::SrcAlpha => crate::sys::SRC_ALPHA,
Self::OneMinusSrcAlpha => crate::sys::ONE_MINUS_SRC_ALPHA,
Self::DstAlpha => crate::sys::DST_ALPHA,
Self::OneMinusDstAlpha => crate::sys::ONE_MINUS_DST_ALPHA,
Self::ConstantColor => crate::sys::CONSTANT_COLOR,
Self::OneMinusConstantColor => crate::sys::ONE_MINUS_CONSTANT_COLOR,
Self::ConstantAlpha => crate::sys::CONSTANT_ALPHA,
Self::OneMinusConstantAlpha => crate::sys::ONE_MINUS_CONSTANT_ALPHA,
}
}
}
#[derive(Debug, Default, Clone, Copy)]
pub enum Equation
{
/// The destination color and source color is added to each other in the blend
/// function
#[default]
Add,
/// The destination color is subtracted from the source color in the blend function
Subtract,
/// The source color is subtracted from the destination color in the blend function
ReverseSubtract,
/// The blend function will take the component-wise minimum of the destination color
/// and the source color
Min,
/// The blend function will take the component-wise maximum of the destination color
/// and the source color
Max,
}
impl Equation
{
fn into_gl(self) -> crate::sys::types::GLenum
{
match self {
Self::Add => crate::sys::FUNC_ADD,
Self::Subtract => crate::sys::FUNC_SUBTRACT,
Self::ReverseSubtract => crate::sys::FUNC_REVERSE_SUBTRACT,
Self::Min => crate::sys::MIN,
Self::Max => crate::sys::MAX,
}
}
}
|
