diff --git a/internal/driver/graphics.go b/internal/driver/graphics.go
index d512da900..8fcc744ef 100644
--- a/internal/driver/graphics.go
+++ b/internal/driver/graphics.go
@@ -29,6 +29,11 @@ type Region struct {
 	Height float32
 }
 
+const (
+	InvalidImageID  = -1
+	InvalidShaderID = -1
+)
+
 type Graphics interface {
 	Begin()
 	End()
@@ -43,7 +48,6 @@ type Graphics interface {
 	IsGL() bool
 	HasHighPrecisionFloat() bool
 	MaxImageSize() int
-	InvalidImageID() ImageID
 
 	NewShader(program *shaderir.Program) (Shader, error)
 
diff --git a/internal/graphicscommand/command.go b/internal/graphicscommand/command.go
index 4a6cbc658..b9b3c56d5 100644
--- a/internal/graphicscommand/command.go
+++ b/internal/graphicscommand/command.go
@@ -417,7 +417,7 @@ func (c *drawTrianglesCommand) Exec(indexOffset int) error {
 		var imgs [graphics.ShaderImageNum]driver.ImageID
 		for i, src := range c.srcs {
 			if src == nil {
-				imgs[i] = theGraphicsDriver.InvalidImageID()
+				imgs[i] = driver.InvalidImageID
 				continue
 			}
 			imgs[i] = src.image.ID()
diff --git a/internal/graphicsdriver/metal/graphics.go b/internal/graphicsdriver/metal/graphics.go
index b44c68436..9e016d5b2 100644
--- a/internal/graphicsdriver/metal/graphics.go
+++ b/internal/graphicsdriver/metal/graphics.go
@@ -413,10 +413,6 @@ func (g *Graphics) genNextImageID() driver.ImageID {
 	return id
 }
 
-func (g *Graphics) InvalidImageID() driver.ImageID {
-	return -1
-}
-
 func (g *Graphics) genNextShaderID() driver.ShaderID {
 	id := g.nextShaderID
 	g.nextShaderID++
diff --git a/internal/graphicsdriver/opengl/graphics.go b/internal/graphicsdriver/opengl/graphics.go
index 074f01d1b..8ed7de348 100644
--- a/internal/graphicsdriver/opengl/graphics.go
+++ b/internal/graphicsdriver/opengl/graphics.go
@@ -79,10 +79,6 @@ func (g *Graphics) genNextImageID() driver.ImageID {
 	return id
 }
 
-func (g *Graphics) InvalidImageID() driver.ImageID {
-	return -1
-}
-
 func (g *Graphics) genNextShaderID() driver.ShaderID {
 	id := g.nextShaderID
 	g.nextShaderID++
@@ -391,7 +387,7 @@ func (g *Graphics) DrawShader(dst driver.ImageID, srcs [graphics.ShaderImageNum]
 
 	var ts [graphics.ShaderImageNum]textureVariable
 	for i, src := range srcs {
-		if src == g.InvalidImageID() {
+		if src == driver.InvalidImageID {
 			continue
 		}
 		ts[i].valid = true