internal/graphicscommand: add Shader.id

internal/graphicscommand/command.go

@@ -98,7 +98,7 @@ func (c *drawTrianglesCommand) String() string {
 		}
 	}
 
-	return fmt.Sprintf("draw-triangles: dst: %s <- src: [%s], num of dst regions: %d, num of indices: %d, blend: %s, fill rule: %s", dst, strings.Join(srcstrs[:], ", "), len(c.dstRegions), c.numIndices(), blend, c.fillRule)
+	return fmt.Sprintf("draw-triangles: dst: %s <- src: [%s], num of dst regions: %d, num of indices: %d, blend: %s, fill rule: %s, shader id: %d", dst, strings.Join(srcstrs[:], ", "), len(c.dstRegions), c.numIndices(), blend, c.fillRule, c.shader.id)
 }
 
 // Exec executes the drawTrianglesCommand.

internal/graphicscommand/image.go

@@ -46,11 +46,11 @@ type Image struct {
 	bufferedWritePixelsArgs []writePixelsCommandArgs
 }
 
-var nextID = 1
+var nextImageID = 1
 
-func genNextID() int {
-	id := nextID
-	nextID++
+func genNextImageID() int {
+	id := nextImageID
+	nextImageID++
 	return id
 }
 
@@ -62,7 +62,7 @@ func NewImage(width, height int, screenFramebuffer bool) *Image {
 		width:  width,
 		height: height,
 		screen: screenFramebuffer,
-		id:     genNextID(),
+		id:     genNextImageID(),
 	}
 	c := &newImageCommand{
 		result: i,

internal/graphicscommand/shader.go

@@ -19,14 +19,24 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
 )
 
+var nextShaderID = 1
+
+func genNextShaderID() int {
+	id := nextShaderID
+	nextShaderID++
+	return id
+}
+
 type Shader struct {
 	shader graphicsdriver.Shader
 	ir     *shaderir.Program
+	id     int
 }
 
 func NewShader(ir *shaderir.Program) *Shader {
 	s := &Shader{
 		ir: ir,
+		id: genNextShaderID(),
 	}
 	c := &newShaderCommand{
 		result: s,