diff --git a/examples/shader/radialblur.go b/examples/shader/radialblur.go
index cacd7dd6a..d794d9555 100644
--- a/examples/shader/radialblur.go
+++ b/examples/shader/radialblur.go
@@ -24,7 +24,7 @@ func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
 	dir := normalize(position.xy - Cursor)
 	clr := image2TextureAt(texCoord)
 
-	samples := [10]float{
+	samples := [...]float{
 		-22, -14, -8, -4, -2, 2, 4, 8, 14, 22,
 	}
 	// TODO: Add len(samples)
diff --git a/examples/shader/radialblur_go.go b/examples/shader/radialblur_go.go
index 46796aac0..5fb658487 100644
--- a/examples/shader/radialblur_go.go
+++ b/examples/shader/radialblur_go.go
@@ -3,4 +3,4 @@
 
 package main
 
-var radialblur_go = []byte("// Copyright 2020 The Ebiten Authors\n//\n// Licensed under the Apache License, Version 2.0 (the \"License\");\n// you may not use this file except in compliance with the License.\n// You may obtain a copy of the License at\n//\n//     http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing, software\n// distributed under the License is distributed on an \"AS IS\" BASIS,\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n// See the License for the specific language governing permissions and\n// limitations under the License.\n\n// +build ignore\n\npackage main\n\nvar Time float\nvar Cursor vec2\nvar ScreenSize vec2\n\nfunc Fragment(position vec4, texCoord vec2, color vec4) vec4 {\n\tdir := normalize(position.xy - Cursor)\n\tclr := image2TextureAt(texCoord)\n\n\tsamples := [10]float{\n\t\t-22, -14, -8, -4, -2, 2, 4, 8, 14, 22,\n\t}\n\t// TODO: Add len(samples)\n\tsum := clr\n\tfor i := 0; i < 10; i++ {\n\t\tpos := texCoord + dir*samples[i]/imageSrcTextureSize()\n\t\tsum += image2TextureBoundsAt(pos)\n\t}\n\tsum /= 10 + 1\n\n\tdist := distance(position.xy, Cursor)\n\tt := clamp(dist/256, 0, 1)\n\treturn mix(clr, sum, t)\n}\n")
+var radialblur_go = []byte("// Copyright 2020 The Ebiten Authors\n//\n// Licensed under the Apache License, Version 2.0 (the \"License\");\n// you may not use this file except in compliance with the License.\n// You may obtain a copy of the License at\n//\n//     http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing, software\n// distributed under the License is distributed on an \"AS IS\" BASIS,\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n// See the License for the specific language governing permissions and\n// limitations under the License.\n\n// +build ignore\n\npackage main\n\nvar Time float\nvar Cursor vec2\nvar ScreenSize vec2\n\nfunc Fragment(position vec4, texCoord vec2, color vec4) vec4 {\n\tdir := normalize(position.xy - Cursor)\n\tclr := image2TextureAt(texCoord)\n\n\tsamples := [...]float{\n\t\t-22, -14, -8, -4, -2, 2, 4, 8, 14, 22,\n\t}\n\t// TODO: Add len(samples)\n\tsum := clr\n\tfor i := 0; i < 10; i++ {\n\t\tpos := texCoord + dir*samples[i]/imageSrcTextureSize()\n\t\tsum += image2TextureBoundsAt(pos)\n\t}\n\tsum /= 10 + 1\n\n\tdist := distance(position.xy, Cursor)\n\tt := clamp(dist/256, 0, 1)\n\treturn mix(clr, sum, t)\n}\n")
diff --git a/internal/shader/expr.go b/internal/shader/expr.go
index 89143c820..818a27178 100644
--- a/internal/shader/expr.go
+++ b/internal/shader/expr.go
@@ -452,6 +452,9 @@ func (cs *compileState) parseExpr(block *block, expr ast.Expr) ([]shaderir.Expr,
 		if !ok {
 			return nil, nil, nil, false
 		}
+		if t.Main == shaderir.Array && t.Length == -1 {
+			t.Length = len(e.Elts)
+		}
 
 		idx := block.totalLocalVariableNum()
 		block.vars = append(block.vars, variable{
diff --git a/internal/shader/type.go b/internal/shader/type.go
index c3b8c3c06..f6ea38008 100644
--- a/internal/shader/type.go
+++ b/internal/shader/type.go
@@ -53,24 +53,28 @@ func (cs *compileState) parseType(block *block, expr ast.Expr) (shaderir.Type, b
 			cs.addError(t.Pos(), fmt.Sprintf("array length must be specified"))
 			return shaderir.Type{}, false
 		}
-		// TODO: Parse ellipsis
-
-		exprs, _, _, ok := cs.parseExpr(block, t.Len)
-		if !ok {
-			return shaderir.Type{}, false
-		}
-		if len(exprs) != 1 {
-			cs.addError(t.Pos(), fmt.Sprintf("invalid length of array"))
-			return shaderir.Type{}, false
-		}
-		if exprs[0].Type != shaderir.NumberExpr {
-			cs.addError(t.Pos(), fmt.Sprintf("length of array must be a constant number"))
-			return shaderir.Type{}, false
-		}
-		len, ok := gconstant.Int64Val(exprs[0].Const)
-		if !ok {
-			cs.addError(t.Pos(), fmt.Sprintf("length of array must be an integer"))
-			return shaderir.Type{}, false
+		var length int
+		if _, ok := t.Len.(*ast.Ellipsis); ok {
+			length = -1 // Determine the length later.
+		} else {
+			exprs, _, _, ok := cs.parseExpr(block, t.Len)
+			if !ok {
+				return shaderir.Type{}, false
+			}
+			if len(exprs) != 1 {
+				cs.addError(t.Pos(), fmt.Sprintf("invalid length of array"))
+				return shaderir.Type{}, false
+			}
+			if exprs[0].Type != shaderir.NumberExpr {
+				cs.addError(t.Pos(), fmt.Sprintf("length of array must be a constant number"))
+				return shaderir.Type{}, false
+			}
+			l, ok := gconstant.Int64Val(exprs[0].Const)
+			if !ok {
+				cs.addError(t.Pos(), fmt.Sprintf("length of array must be an integer"))
+				return shaderir.Type{}, false
+			}
+			length = int(l)
 		}
 
 		elm, ok := cs.parseType(block, t.Elt)
@@ -84,7 +88,7 @@ func (cs *compileState) parseType(block *block, expr ast.Expr) (shaderir.Type, b
 		return shaderir.Type{
 			Main:   shaderir.Array,
 			Sub:    []shaderir.Type{elm},
-			Length: int(len),
+			Length: length,
 		}, true
 	case *ast.StructType:
 		cs.addError(t.Pos(), "struct is not implemented")