2 files changed, 11 insertions, 9 deletions
diff --git a/intern/cycles/kernel/kernel_color.h b/intern/cycles/kernel/kernel_color.h
index d1c3dac824d..990e798543a 100644
--- a/intern/cycles/kernel/kernel_color.h
+++ b/intern/cycles/kernel/kernel_color.h
@@ -23,16 +23,16 @@ CCL_NAMESPACE_BEGIN
 
 ccl_device float3 xyz_to_rgb(KernelGlobals *kg, float3 xyz)
 {
-    return make_float3(dot(kernel_data.film.xyz_to_r, xyz),
-                       dot(kernel_data.film.xyz_to_g, xyz),
-                       dot(kernel_data.film.xyz_to_b, xyz));
+    return make_float3(dot(float4_to_float3(kernel_data.film.xyz_to_r), xyz),
+                       dot(float4_to_float3(kernel_data.film.xyz_to_g), xyz),
+                       dot(float4_to_float3(kernel_data.film.xyz_to_b), xyz));
 }
 
 ccl_device float linear_rgb_to_gray(KernelGlobals *kg, float3 c)
 {
-    return dot(c, kernel_data.film.rgb_to_y);
+    return dot(c, float4_to_float3(kernel_data.film.rgb_to_y));
 }
 
 CCL_NAMESPACE_END
 
-#endif /* __KERNEL_COLOR_H__ */
-\ No newline at end of file
+#endif /* __KERNEL_COLOR_H__ */
diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index e8cbd330184..8df7c369799 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -1274,10 +1274,12 @@ typedef struct KernelFilm {
 
 	int pad1, pad2, pad3;
 
-	float3 xyz_to_r;
-	float3 xyz_to_g;
-	float3 xyz_to_b;
-	float3 rgb_to_y;
+	/* XYZ to rendering color space transform. float4 instead of float3 to
+	 * ensure consistent padding/alignment across devices. */
+	float4 xyz_to_r;
+	float4 xyz_to_g;
+	float4 xyz_to_b;
+	float4 rgb_to_y;
 
 #ifdef __KERNEL_DEBUG__
 	int pass_bvh_traversed_nodes;