diff --git a/internal/graphics/vertices.go b/internal/graphics/vertices.go
index 68791585a..f0bcb6765 100644
--- a/internal/graphics/vertices.go
+++ b/internal/graphics/vertices.go
@@ -23,7 +23,10 @@ type verticesBackend struct {
 	head    int
 }
 
-const VertexFloatNum = 10
+const (
+	IndicesNum     = (1 << 16) / 3 * 3 // Adjust num for triangles.
+	VertexFloatNum = 10
+)
 
 func (v *verticesBackend) slice(n int) []float32 {
 	const num = 1024
diff --git a/internal/graphicscommand/command.go b/internal/graphicscommand/command.go
index e627ed9db..bdbeae337 100644
--- a/internal/graphicscommand/command.go
+++ b/internal/graphicscommand/command.go
@@ -89,7 +89,7 @@ func (q *commandQueue) appendIndices(indices []uint16, offset uint16) {
 }
 
 func (q *commandQueue) doEnqueueDrawImageCommand(dst, src *Image, nvertices, nindices int, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter, forceNewCommand bool) {
-	if nindices > opengl.IndicesNum {
+	if nindices > graphics.IndicesNum {
 		panic("not implemented for too many indices")
 	}
 	if !forceNewCommand && 0 < len(q.commands) {
@@ -113,12 +113,12 @@ func (q *commandQueue) doEnqueueDrawImageCommand(dst, src *Image, nvertices, nin
 
 // EnqueueDrawImageCommand enqueues a drawing-image command.
 func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, indices []uint16, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
-	if len(indices) > opengl.IndicesNum {
+	if len(indices) > graphics.IndicesNum {
 		panic("not reached")
 	}
 
 	split := false
-	if q.tmpNumIndices+len(indices) > opengl.IndicesNum {
+	if q.tmpNumIndices+len(indices) > graphics.IndicesNum {
 		q.tmpNumIndices = 0
 		q.nextIndex = 0
 		split = true
@@ -155,10 +155,10 @@ func (q *commandQueue) Flush() {
 		ne := 0
 		nc := 0
 		for _, c := range q.commands {
-			if c.NumIndices() > opengl.IndicesNum {
+			if c.NumIndices() > graphics.IndicesNum {
 				panic("not reached")
 			}
-			if ne+c.NumIndices() > opengl.IndicesNum {
+			if ne+c.NumIndices() > graphics.IndicesNum {
 				break
 			}
 			nv += c.NumVertices()
diff --git a/internal/opengl/program.go b/internal/opengl/program.go
index 14056b6b8..ced02d436 100644
--- a/internal/opengl/program.go
+++ b/internal/opengl/program.go
@@ -54,7 +54,7 @@ func (a *arrayBufferLayout) totalBytes() int {
 
 // newArrayBuffer creates OpenGL's buffer object for the array buffer.
 func (a *arrayBufferLayout) newArrayBuffer() buffer {
-	return theContext.newArrayBuffer(a.totalBytes() * IndicesNum)
+	return theContext.newArrayBuffer(a.totalBytes() * graphics.IndicesNum)
 }
 
 // enable binds the array buffer the given program to use the array buffer.
@@ -144,8 +144,7 @@ var (
 )
 
 const (
-	IndicesNum   = (1 << 16) / 3 * 3 // Adjust num for triangles.
-	maxTriangles = IndicesNum / 3
+	maxTriangles = graphics.IndicesNum / 3
 	maxQuads     = maxTriangles / 2
 )
 
@@ -239,7 +238,7 @@ func (s *openGLState) reset() error {
 	// Note that the indices passed to NewElementArrayBuffer is not under GC management
 	// in opengl package due to unsafe-way.
 	// See NewElementArrayBuffer in context_mobile.go.
-	s.elementArrayBuffer = theContext.newElementArrayBuffer(IndicesNum * 2)
+	s.elementArrayBuffer = theContext.newElementArrayBuffer(graphics.IndicesNum * 2)
 
 	return nil
 }