diff --git a/ref_vk/sebastian.py b/ref_vk/sebastian.py
index 858b880e..583beee5 100755
--- a/ref_vk/sebastian.py
+++ b/ref_vk/sebastian.py
@@ -2,6 +2,7 @@
 import json
 import argparse
 import struct
+import copy
 from spirv import spv
 
 parser = argparse.ArgumentParser(description='Build pipeline descriptor')
@@ -151,6 +152,38 @@ def parseSpirv(raw_data):
 
 	return ctx
 
+class Binding:
+	STAGE_VERTEX_BIT = 0x00000001
+	STAGE_TESSELLATION_CONTROL_BIT = 0x00000002
+	STAGE_TESSELLATION_EVALUATION_BIT = 0x00000004
+	STAGE_GEOMETRY_BIT = 0x00000008
+	STAGE_FRAGMENT_BIT = 0x00000010
+	STAGE_COMPUTE_BIT = 0x00000020
+	STAGE_ALL_GRAPHICS = 0x0000001F
+	STAGE_ALL = 0x7FFFFFFF
+	STAGE_RAYGEN_BIT_KHR = 0x00000100
+	STAGE_ANY_HIT_BIT_KHR = 0x00000200
+	STAGE_CLOSEST_HIT_BIT_KHR = 0x00000400
+	STAGE_MISS_BIT_KHR = 0x00000800
+	STAGE_INTERSECTION_BIT_KHR = 0x00001000
+	STAGE_CALLABLE_BIT_KHR = 0x00002000
+	STAGE_TASK_BIT_NV = 0x00000040
+	STAGE_MESH_BIT_NV = 0x00000080
+	STAGE_SUBPASS_SHADING_BIT_HUAWEI = 0x00004000
+
+	def __init__(self, name, descriptor_set, index, stages):
+		self.name = name
+		self.index = index
+		self.descriptor_set = descriptor_set
+		self.stages = stages
+		#TODO: type, count, etc
+
+	def serialize(self, out):
+		out.writeString(self.name)
+		out.writeU32(self.descriptor_set)
+		out.writeU32(self.index)
+		out.writeU32(self.stages)
+
 class Shader:
 	def __init__(self, name, file):
 		self.name = name
@@ -165,7 +198,23 @@ class Shader:
 				ret += ('[%d:%d] (id=%d) %s\n' % (node.descriptor_set, node.binding, index, node.name))
 		return ret
 
+	def getBindings(self):
+		ret = []
+		for node in self.spirv.nodes:
+			if node.binding == None or node.descriptor_set == None:
+				continue
+			ret.append(Binding(node.name, node.descriptor_set, node.binding, 0))
+		return ret
+
 class Shaders:
+	__suffixes = {
+		Binding.STAGE_COMPUTE_BIT: '.comp.spv',
+		Binding.STAGE_RAYGEN_BIT_KHR: '.rgen.spv',
+		Binding.STAGE_ANY_HIT_BIT_KHR: '.rahit.spv',
+		Binding.STAGE_CLOSEST_HIT_BIT_KHR: '.rchit.spv',
+		Binding.STAGE_MISS_BIT_KHR: '.rmiss.spv'
+	}
+
 	def __init__(self):
 		self.__map = dict()
 		self.__shaders = []
@@ -185,7 +234,8 @@ class Shaders:
 
 		raise Exception('Cannot load shader ' + name)
 
-	def load(self, name):
+	def load(self, name, stage):
+		name = name + self.__suffixes[stage]
 		if name in self.__map:
 			return self.__shaders[self.__map[name]]
 
@@ -209,27 +259,46 @@ class Shaders:
 
 shaders = Shaders()
 
-
 PIPELINE_COMPUTE = 1
 PIPELINE_RAYTRACING = 2
 NO_SHADER = 0xffffffff
 
-class PipelineRayTracing:
-	def __loadHit(hit):
-		ret = dict()
-		suffixes = {'closest': '.rchit.spv', 'any': '.rahit.spv'}
-		for k, v in hit.items():
-			ret[k] = shaders.load(v + suffixes[k])
-		return ret
-
-	def __init__(self, name, desc):
-		self.type = PIPELINE_RAYTRACING
+class Pipeline:
+	def __init__(self, name, type_id):
 		self.name = name
-		self.rgen = shaders.load(desc['rgen'] + '.rgen.spv')
-		self.miss = [] if not 'miss' in desc else [shaders.load(s + '.rmiss.spv') for s in desc['miss']]
-		self.hit = [] if not 'hit' in desc else [PipelineRayTracing.__loadHit(hit) for hit in desc['hit']]
+		self.type = type_id
+		self.__bindings = {}
+
+	def addShader(self, shader_name, stage):
+		shader = shaders.load(shader_name, stage)
+		for binding in shader.getBindings():
+			addr = (binding.descriptor_set, binding.index)
+			if addr in self.__bindings:
+				self.__bindings[addr].stages |= stage
+			else:
+				self.__bindings[addr] = copy.deepcopy(binding)
+
+		return shader
 
 	def serialize(self, out):
+		print(self.__bindings)
+		out.writeU32(self.type)
+		out.writeString(self.name)
+		#out.writeArray(self.__bindings)
+
+class PipelineRayTracing(Pipeline):
+	__hit2stage = {
+		'closest': Binding.STAGE_CLOSEST_HIT_BIT_KHR,
+		'any': Binding.STAGE_ANY_HIT_BIT_KHR,
+	}
+	def __init__(self, name, desc):
+		super().__init__(name, PIPELINE_RAYTRACING)
+		self.rgen = self.addShader(desc['rgen'], Binding.STAGE_RAYGEN_BIT_KHR)
+		self.miss = [] if not 'miss' in desc else [self.addShader(s, Binding.STAGE_MISS_BIT_KHR) for s in desc['miss']]
+		self.hit = [] if not 'hit' in desc else [self.__loadHit(hit) for hit in desc['hit']]
+
+	def serialize(self, out):
+		super().serialize(out)
 		out.writeU32(shaders.getIndex(self.rgen))
 		out.writeArray([shaders.getIndex(s) for s in self.miss])
 
@@ -238,13 +307,19 @@ class PipelineRayTracing:
 			out.writeU32(shaders.getIndex(hit['closest']) if 'closest' in hit else NO_SHADER)
 			out.writeU32(shaders.getIndex(hit['any']) if 'any' in hit else NO_SHADER)
 
-class PipelineCompute:
+	def __loadHit(self, hit):
+		ret = dict()
+		for k, v in hit.items():
+			ret[k] = self.addShader(v, self.__hit2stage[k])
+		return ret
+
+class PipelineCompute(Pipeline):
 	def __init__(self, name, desc):
-		self.type = PIPELINE_COMPUTE
-		self.name = name
-		self.comp = shaders.load(desc['comp'] + '.comp.spv')
+		super().__init__(name, PIPELINE_COMPUTE)
+		self.comp = self.addShader(desc['comp'], Binding.STAGE_COMPUTE_BIT)
 
 	def serialize(self, out):
+		super().serialize(out)
 		out.writeU32(shaders.getIndex(self.comp))
 
 def parsePipeline(pipelines, name, desc):
@@ -276,8 +351,6 @@ def writeOutput(file, pipelines):
 
 	out.writeU32(len(pipelines))
 	for name, pipeline in pipelines.items():
-		out.writeU32(pipeline.type)
-		out.writeString(pipeline.name)
 		pipeline.serialize(out)
 
 pipelines = loadPipelines()