mesa: Add _mesa_is_array_texture helper

Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/main/teximage.c

@@ -738,6 +738,28 @@ _mesa_is_proxy_texture(GLenum target)
 }
 
 
+/**
+ * Test if a target is an array target.
+ *
+ * \param target texture target.
+ *
+ * \return true if the target is an array target, false otherwise.
+ */
+bool
+_mesa_is_array_texture(GLenum target)
+{
+   switch (target) {
+   case GL_TEXTURE_1D_ARRAY:
+   case GL_TEXTURE_2D_ARRAY:
+   case GL_TEXTURE_CUBE_MAP_ARRAY:
+   case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+      return true;
+   default:
+      return false;
+   };
+}
+
+
 /**
  * Return the proxy target which corresponds to the given texture target
  */

src/mesa/main/teximage.h

@@ -66,6 +66,9 @@ _mesa_base_tex_format( struct gl_context *ctx, GLint internalFormat );
 extern GLboolean
 _mesa_is_proxy_texture(GLenum target);
 
+extern bool
+_mesa_is_array_texture(GLenum target);
+
 extern struct gl_texture_image *
 _mesa_new_texture_image( struct gl_context *ctx );