diff --git a/internal/graphicscommand/command.go b/internal/graphicscommand/command.go
index 214d65042..972074edd 100644
--- a/internal/graphicscommand/command.go
+++ b/internal/graphicscommand/command.go
@@ -265,6 +265,8 @@ func (q *commandQueue) Flush() error {
 			vs[i*graphics.VertexFloatNum+6] -= 1.0 / s.width * texelAdjustmentFactor
 			vs[i*graphics.VertexFloatNum+7] -= 1.0 / s.height * texelAdjustmentFactor
 		}
+
+		// TODO: Adjust the source sizes in uniform variables.
 	} else {
 		n := q.nvertices / graphics.VertexFloatNum
 		for i := 0; i < n; i++ {
diff --git a/internal/restorable/shader_test.go b/internal/restorable/shader_test.go
index 77a3d9d74..da49ae9a2 100644
--- a/internal/restorable/shader_test.go
+++ b/internal/restorable/shader_test.go
@@ -116,10 +116,8 @@ func TestShaderMultipleSources(t *testing.T) {
 		[]float32{1, 1},
 		srcs[0],
 		srcs[1],
-		[]float32{1, 1},
 		[]float32{0, 0, 1, 1},
 		srcs[2],
-		[]float32{1, 1},
 		[]float32{0, 0, 1, 1},
 	}
 	dst.DrawTriangles(nil, quadVertices(1, 1, 0, 0), graphics.QuadIndices(), nil, driver.CompositeModeCopy, driver.FilterNearest, driver.AddressClampToZero, s, us)
diff --git a/internal/shareable/image.go b/internal/shareable/image.go
index 995cf6b87..ba632d36a 100644
--- a/internal/shareable/image.go
+++ b/internal/shareable/image.go
@@ -328,10 +328,6 @@ func (i *Image) DrawTriangles(img *Image, vertices []float32, indices []uint16,
 		case *Image:
 			us[i] = v.backend.restorable
 			if !firstImage {
-				i++
-				pos := us[i].([]float32)
-				pos[0] += oxf
-				pos[1] += oyf
 				i++
 				region := us[i].([]float32)
 				region[0] += oxf
diff --git a/internal/testing/shader.go b/internal/testing/shader.go
index 29bc8573d..ba4e3c4d5 100644
--- a/internal/testing/shader.go
+++ b/internal/testing/shader.go
@@ -266,9 +266,8 @@ func ShaderProgramFill(r, g, b, a byte) shaderir.Program {
 //
 //   0:    the framebuffer size (Vec2)
 //   1:    the first images (Sampler2D)
-//   3n-1: the (n+1)th image (Sampler2D)
-//   3n:   the (n+1)th image's size (Vec2)
-//   3n+1: the (n+1)th image's region (Vec4)
+//   2n:   the n-th image (Sampler2D)
+//   2n+1: the n-th image's region (Vec4)
 //
 // The first image's size and region are represented in attribute variables.
 //
@@ -283,7 +282,6 @@ func ShaderProgramImages(imageNum int) shaderir.Program {
 	for i := 0; i < imageNum; i++ {
 		p.Uniforms = append(p.Uniforms, shaderir.Type{Main: shaderir.Sampler2D})
 		if i > 0 {
-			p.Uniforms = append(p.Uniforms, shaderir.Type{Main: shaderir.Vec2})
 			p.Uniforms = append(p.Uniforms, shaderir.Type{Main: shaderir.Vec4})
 		}
 	}
@@ -341,7 +339,7 @@ func ShaderProgramImages(imageNum int) shaderir.Program {
 							},
 							{
 								Type:  shaderir.UniformVariable,
-								Index: 3*i - 1,
+								Index: 2 * i,
 							},
 							texPos,
 						},