diff --git a/wgpu/src/shader/quad.wgsl b/wgpu/src/shader/quad.wgsl
index 0a4cd7b4..bef8bd40 100644
--- a/wgpu/src/shader/quad.wgsl
+++ b/wgpu/src/shader/quad.wgsl
@@ -5,6 +5,10 @@ struct Globals {
 
 @group(0) @binding(0) var<uniform> globals: Globals;
 
+fn premultiply(color: vec4<f32>) -> vec4<f32> {
+    return vec4(color.xyz * color.a, color.a);
+}
+
 fn blend(over: vec4<f32>, under: vec4<f32>, alpha: f32) -> vec4<f32> {
     return over * alpha + under * (1.0 - alpha);
 }
diff --git a/wgpu/src/shader/quad/gradient.wgsl b/wgpu/src/shader/quad/gradient.wgsl
index ddd7d1c4..d743e26d 100644
--- a/wgpu/src/shader/quad/gradient.wgsl
+++ b/wgpu/src/shader/quad/gradient.wgsl
@@ -56,7 +56,7 @@ fn gradient_vs_main(input: GradientVertexInput) -> GradientVertexOutput {
     out.offsets = input.offsets;
     out.direction = input.direction * globals.scale;
     out.position_and_scale = vec4<f32>(pos, scale);
-    out.border_color = vec4(input.border_color.xyz * input.border_color.a, input.border_color.a);
+    out.border_color = premultiply(input.border_color);
     out.border_radius = border_radius * globals.scale;
     out.border_width = input.border_width * globals.scale;
 
@@ -198,9 +198,7 @@ fn gradient_fs_main(input: GradientVertexOutput) -> @location(0) vec4<f32> {
 }
 
 fn unpack_color(data: vec2<u32>) -> vec4<f32> {
-    let color = unpack_u32(data);
-
-    return vec4(color.xyz * color.a, color.a);
+    return premultiply(unpack_u32(data));
 }
 
 fn unpack_u32(data: vec2<u32>) -> vec4<f32> {
diff --git a/wgpu/src/shader/quad/solid.wgsl b/wgpu/src/shader/quad/solid.wgsl
index 979d7174..d5d1e604 100644
--- a/wgpu/src/shader/quad/solid.wgsl
+++ b/wgpu/src/shader/quad/solid.wgsl
@@ -56,13 +56,13 @@ fn solid_vs_main(input: SolidVertexInput) -> SolidVertexOutput {
     );
 
     out.position = globals.transform * transform * vec4<f32>(vertex_position(input.vertex_index), 0.0, 1.0);
-    out.color = vec4(input.color.xyz * input.color.a, input.color.a);
-    out.border_color = vec4(input.border_color.xyz * input.border_color.a, input.border_color.a);
+    out.color = premultiply(input.color);
+    out.border_color = premultiply(input.border_color);
     out.pos = input.pos * globals.scale + snap;
     out.scale = input.scale * globals.scale;
     out.border_radius = border_radius * globals.scale;
     out.border_width = input.border_width * globals.scale;
-    out.shadow_color = vec4(input.shadow_color.xyz, input.shadow_color.a);
+    out.shadow_color = premultiply(input.shadow_color);
     out.shadow_offset = input.shadow_offset * globals.scale;
     out.shadow_blur_radius = input.shadow_blur_radius * globals.scale;