##########################################################################
#
#  Copyright (c) 2013, Image Engine Design Inc. All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are
#  met:
#
#      * Redistributions of source code must retain the above
#        copyright notice, this list of conditions and the following
#        disclaimer.
#
#      * Redistributions in binary form must reproduce the above
#        copyright notice, this list of conditions and the following
#        disclaimer in the documentation and/or other materials provided with
#        the distribution.
#
#      * Neither the name of John Haddon nor the names of
#        any other contributors to this software may be used to endorse or
#        promote products derived from this software without specific prior
#        written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
#  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
#  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
#  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
#  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
#  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
#  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
#  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
#  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
#  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
##########################################################################

import GafferSceneUI

import GafferRenderMan

## Appends menu items for the creation of all renderman shaders found on the searchpath, optionally
# filtered by filename based on matchExpression.
def appendShaders( menuDefinition, prefix="/RenderMan/Shader", matchExpression = "*" ) :

	searchPaths = GafferRenderMan.RenderManShader.shaderLoader().searchPath.paths
	# the 3delight installer adds "." to the shader path, but we skip it
	# since it can lead to us traversing into arbitrarily deep hierarchies
	# rooted in the current directory.
	searchPaths = [ p for p in searchPaths if p != "." ]

	GafferSceneUI.ShaderUI.appendShaders(
		menuDefinition, prefix, searchPaths, [ "slo", "sdl" ], __nodeCreator, matchExpression
	)

def __nodeCreator( nodeName, shaderName ) :

	shader = GafferRenderMan.RenderManShader.shaderLoader().read( shaderName + ".sdl" )
	if shader.type == "light" :
		node = GafferRenderMan.RenderManLight( nodeName )
	else :
		node = GafferRenderMan.RenderManShader( nodeName )

	node.loadShader( shaderName )

	return node

