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Add conversions from Color to u32 (#4088)

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# Objective

- `Mesh::ATTRIBUTE_COLOR` expects colors as `u32`s but there is no function for easy conversion.
- See https://github.com/bevyengine/bevy/pull/4037#pullrequestreview-894448677

## Solution

- Added `Color::as_rgba_u32` and `Color::as_linear_rgba_u32`
This commit is contained in:
Alix Bott 2022-03-08 00:46:03 +00:00
parent e3a3b5b9c2
commit e36c9b6cf0
1 changed files with 93 additions and 1 deletions
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94
crates/bevy_render/src/color/mod.rs
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@ -414,7 +414,7 @@ impl Color {
}
}
/// Converts a `Color` to a `[f32; 4]` from linear RBG colorspace
/// Converts a `Color` to a `[f32; 4]` from linear RGB colorspace
#[inline]
pub fn as_linear_rgba_f32(self: Color) -> [f32; 4] {
match self {
@ -487,6 +487,98 @@ impl Color {
} => [hue, saturation, lightness, alpha],
}
}
/// Converts Color to a u32 from sRGB colorspace.
///
/// Maps the RGBA channels in RGBA order to a little-endian byte array (GPUs are little-endian).
/// A will be the most significant byte and R the least significant.
pub fn as_rgba_u32(self: Color) -> u32 {
match self {
Color::Rgba {
red,
green,
blue,
alpha,
} => u32::from_le_bytes([
(red * 255.0) as u8,
(green * 255.0) as u8,
(blue * 255.0) as u8,
(alpha * 255.0) as u8,
]),
Color::RgbaLinear {
red,
green,
blue,
alpha,
} => u32::from_le_bytes([
(red.linear_to_nonlinear_srgb() * 255.0) as u8,
(green.linear_to_nonlinear_srgb() * 255.0) as u8,
(blue.linear_to_nonlinear_srgb() * 255.0) as u8,
(alpha * 255.0) as u8,
]),
Color::Hsla {
hue,
saturation,
lightness,
alpha,
} => {
let [red, green, blue] =
HslRepresentation::hsl_to_nonlinear_srgb(hue, saturation, lightness);
u32::from_le_bytes([
(red * 255.0) as u8,
(green * 255.0) as u8,
(blue * 255.0) as u8,
(alpha * 255.0) as u8,
])
}
}
}
/// Converts Color to a u32 from linear RGB colorspace.
///
/// Maps the RGBA channels in RGBA order to a little-endian byte array (GPUs are little-endian).
/// A will be the most significant byte and R the least significant.
pub fn as_linear_rgba_u32(self: Color) -> u32 {
match self {
Color::Rgba {
red,
green,
blue,
alpha,
} => u32::from_le_bytes([
(red.nonlinear_to_linear_srgb() * 255.0) as u8,
(green.nonlinear_to_linear_srgb() * 255.0) as u8,
(blue.nonlinear_to_linear_srgb() * 255.0) as u8,
(alpha * 255.0) as u8,
]),
Color::RgbaLinear {
red,
green,
blue,
alpha,
} => u32::from_le_bytes([
(red * 255.0) as u8,
(green * 255.0) as u8,
(blue * 255.0) as u8,
(alpha * 255.0) as u8,
]),
Color::Hsla {
hue,
saturation,
lightness,
alpha,
} => {
let [red, green, blue] =
HslRepresentation::hsl_to_nonlinear_srgb(hue, saturation, lightness);
u32::from_le_bytes([
(red.nonlinear_to_linear_srgb() * 255.0) as u8,
(green.nonlinear_to_linear_srgb() * 255.0) as u8,
(blue.nonlinear_to_linear_srgb() * 255.0) as u8,
(alpha * 255.0) as u8,
])
}
}
}
}
impl Default for Color {