gpu,gpu/internal: move InputDesc back from gioui.org/shader module

It was moved to gioui.org/shader by mistake.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

gpu/internal/driver/driver.go

@@ -60,11 +60,19 @@ type Pipeline interface {
 type PipelineDesc struct {
 	VertexShader   VertexShader
 	FragmentShader FragmentShader
-	VertexLayout   []shader.InputDesc
+	VertexLayout   []InputDesc
 	BlendDesc      BlendDesc
 	PixelFormat    TextureFormat
 }
 
+// InputDesc describes a vertex attribute as laid out in a Buffer.
+type InputDesc struct {
+	Type shader.DataType
+	Size int
+
+	Offset int
+}
+
 type BlendDesc struct {
 	Enable               bool
 	SrcFactor, DstFactor BlendFactor