diff --git a/internal/builtinshader/gen.go b/internal/builtinshader/gen.go
index 5130ec58c..993f9197f 100644
--- a/internal/builtinshader/gen.go
+++ b/internal/builtinshader/gen.go
@@ -65,15 +65,20 @@ func xmain() error {
 		return err
 	}
 
-	for _, s := range builtinshader.AppendShaderSources(nil) {
-		if _, err := w.WriteString("\n"); err != nil {
-			return err
-		}
-		if _, err := w.WriteString("//ebitengine:shader\n"); err != nil {
-			return err
-		}
-		if _, err := fmt.Fprintf(w, "const _ = %q\n", s); err != nil {
-			return err
+	for filter := builtinshader.Filter(0); filter < builtinshader.FilterCount; filter++ {
+		for address := builtinshader.Address(0); address < builtinshader.AddressCount; address++ {
+			for _, useColorM := range []bool{false, true} {
+				s := builtinshader.ShaderSource(filter, address, useColorM)
+				if _, err := w.WriteString("\n"); err != nil {
+					return err
+				}
+				if _, err := w.WriteString("//ebitengine:shader\n"); err != nil {
+					return err
+				}
+				if _, err := fmt.Fprintf(w, "const _ = %q\n", s); err != nil {
+					return err
+				}
+			}
 		}
 	}
 
diff --git a/internal/builtinshader/shader.go b/internal/builtinshader/shader.go
index 0a9eecbdc..5be57319d 100644
--- a/internal/builtinshader/shader.go
+++ b/internal/builtinshader/shader.go
@@ -200,12 +200,3 @@ func Fragment() vec4 {
 	return vec4(0)
 }
 `
-
-func AppendShaderSources(sources [][]byte) [][]byte {
-	for filter := Filter(0); filter < FilterCount; filter++ {
-		for address := Address(0); address < AddressCount; address++ {
-			sources = append(sources, ShaderSource(filter, address, false), ShaderSource(filter, address, true))
-		}
-	}
-	return sources
-}