internal/builtinshader: add a comment to the generated file

go.mod

@@ -15,11 +15,11 @@ require (
 	github.com/jezek/xgb v1.1.1
 	github.com/jfreymuth/oggvorbis v1.0.5
 	github.com/kisielk/errcheck v1.8.0
-	golang.org/x/image v0.22.0
+	golang.org/x/image v0.23.0
 	golang.org/x/sync v0.10.0
 	golang.org/x/sys v0.28.0
-	golang.org/x/text v0.20.0
-	golang.org/x/tools v0.27.0
+	golang.org/x/text v0.21.0
+	golang.org/x/tools v0.28.0
 )
 
 require (

go.sum

@@ -38,8 +38,9 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
 golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
 golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
 golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
-golang.org/x/image v0.22.0 h1:UtK5yLUzilVrkjMAZAZ34DXGpASN8i8pj8g+O+yd10g=
 golang.org/x/image v0.22.0/go.mod h1:9hPFhljd4zZ1GNSIZJ49sqbp45GKK9t6w+iXvGqZUz4=
+golang.org/x/image v0.23.0 h1:HseQ7c2OpPKTPVzNjG5fwJsOTCiiwS4QdsYi5XU6H68=
+golang.org/x/image v0.23.0/go.mod h1:wJJBTdLfCCf3tiHa1fNxpZmUI4mmoZvwMCPP0ddoNKY=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
@@ -94,14 +95,15 @@ golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/text v0.20.0 h1:gK/Kv2otX8gz+wn7Rmb3vT96ZwuoxnQlY+HlJVj7Qug=
 golang.org/x/text v0.20.0/go.mod h1:D4IsuqiFMhST5bX19pQ9ikHC2GsaKyk/oF+pn3ducp4=
+golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
 golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
-golang.org/x/tools v0.27.0 h1:qEKojBykQkQ4EynWy4S8Weg69NumxKdn40Fce3uc/8o=
-golang.org/x/tools v0.27.0/go.mod h1:sUi0ZgbwW9ZPAq26Ekut+weQPR5eIM6GQLQ1Yjm1H0Q=
+golang.org/x/tools v0.28.0 h1:WuB6qZ4RPCQo5aP3WdKZS7i595EdWqWR8vqJTlwTVK8=
+golang.org/x/tools v0.28.0/go.mod h1:dcIOrVd3mfQKTgrDVQHqCPMWy6lnhfhtX3hLXYVLfRw=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

internal/builtinshader/defs.go

@@ -14,6 +14,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// This file is intended for precompiled shaders that will be introduced in the future.
+// All constant names are underscores and not actually used,
+// so they do not affect the binary file size.
+
 package builtinshader
 
 //ebitengine:shader

internal/builtinshader/gen.go

@@ -46,6 +46,11 @@ const license = `// Copyright 2024 The Ebitengine Authors
 // limitations under the License.
 `
 
+const note = `// This file is intended for precompiled shaders that will be introduced in the future.
+// All constant names are underscores and not actually used,
+// so they do not affect the binary file size.
+`
+
 func xmain() error {
 	f, err := os.Create("defs.go")
 	if err != nil {
@@ -61,6 +66,12 @@ func xmain() error {
 	if _, err := w.WriteString(license); err != nil {
 		return err
 	}
+	if _, err := w.WriteString("\n"); err != nil {
+		return err
+	}
+	if _, err := w.WriteString(note); err != nil {
+		return err
+	}
 	if _, err := w.WriteString("\npackage builtinshader\n"); err != nil {
 		return err
 	}

internal/shaderir/program.go

@@ -16,6 +16,7 @@
 package shaderir
 
 import (
+	"bytes"
 	"encoding/hex"
 	"go/constant"
 	"go/token"
@@ -35,7 +36,7 @@ type SourceHash [16]byte
 
 func CalcSourceHash(source []byte) SourceHash {
 	h := fnv.New128a()
-	_, _ = h.Write(source)
+	_, _ = h.Write(bytes.TrimSpace(source))
 
 	var hash SourceHash
 	h.Sum(hash[:0])