From 0c0125c56d82d72cd78cdd7b87632ab8234293af Mon Sep 17 00:00:00 2001
From: Azorlogh <bott.alix@gmail.com>
Date: Thu, 3 Mar 2022 16:10:23 +0100
Subject: [PATCH 1/3] add Color::as_rgba_u32 and Color::as_linear_rgba_u32

---
 crates/bevy_render/src/color/mod.rs | 86 +++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/crates/bevy_render/src/color/mod.rs b/crates/bevy_render/src/color/mod.rs
index bdfe03dd44d77..2aedfe099a025 100644
--- a/crates/bevy_render/src/color/mod.rs
+++ b/crates/bevy_render/src/color/mod.rs
@@ -487,6 +487,92 @@ impl Color {
             } => [hue, saturation, lightness, alpha],
         }
     }
+
+    /// Converts a `Color` to a `u32` from sRGB colorspace.
+    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 a `Color` to a `u32` from linear RBG colorspace
+    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 {

From d8b1508a90df0363261a30c590fc50a774d8294f Mon Sep 17 00:00:00 2001
From: Azorlogh <bott.alix@gmail.com>
Date: Fri, 4 Mar 2022 09:24:17 +0100
Subject: [PATCH 2/3] fix comment typo

---
 crates/bevy_render/src/color/mod.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crates/bevy_render/src/color/mod.rs b/crates/bevy_render/src/color/mod.rs
index 2aedfe099a025..3f1eac3adabfe 100644
--- a/crates/bevy_render/src/color/mod.rs
+++ b/crates/bevy_render/src/color/mod.rs
@@ -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 {
@@ -531,7 +531,7 @@ impl Color {
         }
     }
 
-    /// Converts a `Color` to a `u32` from linear RBG colorspace
+    /// Converts a `Color` to a `u32` from linear RGB colorspace
     pub fn as_linear_rgba_u32(self: Color) -> u32 {
         match self {
             Color::Rgba {

From a64ec668e784c6c0776a946a9ef179e099fea83d Mon Sep 17 00:00:00 2001
From: Azorlogh <bott.alix@gmail.com>
Date: Mon, 7 Mar 2022 09:52:20 +0100
Subject: [PATCH 3/3] improve comment

---
 crates/bevy_render/src/color/mod.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/crates/bevy_render/src/color/mod.rs b/crates/bevy_render/src/color/mod.rs
index 3f1eac3adabfe..834f2b3aae978 100644
--- a/crates/bevy_render/src/color/mod.rs
+++ b/crates/bevy_render/src/color/mod.rs
@@ -488,7 +488,10 @@ impl Color {
         }
     }
 
-    /// Converts a `Color` to a `u32` from sRGB colorspace.
+    /// 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 {
@@ -531,7 +534,10 @@ impl Color {
         }
     }
 
-    /// Converts a `Color` to a `u32` from linear RGB colorspace
+    /// 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 {