diff --git a/include/fwk/gfx/shader_compiler.h b/include/fwk/gfx/shader_compiler.h
index b75db051..316f18ed 100644
--- a/include/fwk/gfx/shader_compiler.h
+++ b/include/fwk/gfx/shader_compiler.h
@@ -14,8 +14,7 @@ struct ShaderCompilerSetup {
 	vector<FilePath> source_dirs;
 	Maybe<FilePath> spirv_cache_dir;
 	VulkanVersion vulkan_version = {1, 2, 0};
-	Maybe<double> glsl_version = 4.5;
-	Maybe<double> spirv_version = 1.3;
+	Maybe<double> spirv_version = 1.5;
 	bool debug_info = false;
 	bool generate_assembly = false;
 };
diff --git a/include/fwk/vulkan/vulkan_internal.h b/include/fwk/vulkan/vulkan_internal.h
index cbaa7db4..618bc2ad 100644
--- a/include/fwk/vulkan/vulkan_internal.h
+++ b/include/fwk/vulkan/vulkan_internal.h
@@ -16,6 +16,7 @@ inline auto toVk(VDescriptorType type) {
 	return type == VDescriptorType::accel_struct ? VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR :
 												   VkDescriptorType(type);
 }
+
 inline auto toVk(VDescriptorPoolFlags flags) { return VkDescriptorPoolCreateFlagBits(flags.bits); }
 inline auto toVk(VPrimitiveTopology type) { return VkPrimitiveTopology(type); }
 inline auto toVk(VImageUsageFlags usage) { return VkImageUsageFlags{usage.bits}; }
diff --git a/include/fwk/vulkan/vulkan_ray_tracing.h b/include/fwk/vulkan/vulkan_ray_tracing.h
index 7be28ecc..aa1b5122 100644
--- a/include/fwk/vulkan/vulkan_ray_tracing.h
+++ b/include/fwk/vulkan/vulkan_ray_tracing.h
@@ -23,6 +23,7 @@ class VulkanAccelStruct : public VulkanObjectBase<VulkanAccelStruct> {
 	~VulkanAccelStruct();
 
 	PVBuffer m_buffer;
+	PVBuffer m_scratch_buffer;
 };
 
 }
diff --git a/include/fwk/vulkan_base.h b/include/fwk/vulkan_base.h
index 6062b439..001051b1 100644
--- a/include/fwk/vulkan_base.h
+++ b/include/fwk/vulkan_base.h
@@ -91,7 +91,7 @@ DEFINE_ENUM(VBindPoint, graphics, compute);
 
 DEFINE_ENUM(VBufferUsage, transfer_src, transfer_dst, uniform_texel_buffer, storage_texel_buffer,
 			uniform_buffer, storage_buffer, index_buffer, vertex_buffer, indirect_buffer,
-			device_address, accel_struct_build_input, accel_struct_storage);
+			device_address, accel_struct_build_input_read_only, accel_struct_storage);
 using VBufferUsageFlags = EnumFlags<VBufferUsage>;
 
 DEFINE_ENUM(VImageUsage, transfer_src, transfer_dst, sampled, storage, color_att, depth_stencil_att,
diff --git a/src/gfx/shader_compiler.cpp b/src/gfx/shader_compiler.cpp
index 2e0031a2..098e4ae0 100644
--- a/src/gfx/shader_compiler.cpp
+++ b/src/gfx/shader_compiler.cpp
@@ -182,9 +182,7 @@ ShaderCompiler::ShaderCompiler(ShaderCompilerSetup setup) {
 	}
 	uint vk_version = (setup.vulkan_version.major << 22) | (setup.vulkan_version.minor << 12);
 	shaderc_compile_options_set_target_env(opts, shaderc_target_env_vulkan, vk_version);
-	if(setup.glsl_version)
-		shaderc_compile_options_set_forced_version_profile(opts, int(*setup.glsl_version * 100),
-														   shaderc_profile_none);
+
 	if(setup.spirv_version) {
 		int version = int(*setup.spirv_version * 10);
 		int major = version / 10;
diff --git a/src/vulkan/vulkan_device.cpp b/src/vulkan/vulkan_device.cpp
index 18bbfae5..84b23c70 100644
--- a/src/vulkan/vulkan_device.cpp
+++ b/src/vulkan/vulkan_device.cpp
@@ -186,9 +186,9 @@ Ex<void> VulkanDevice::initialize(const VDeviceSetup &setup) {
 		m_features |= VDeviceFeature::shader_clock;
 	}
 
-	vector<string> raytracing_exts{{VK_KHR_ACCELERATION_STRUCTURE_EXTENSION_NAME,
-									VK_KHR_RAY_TRACING_PIPELINE_EXTENSION_NAME,
-									VK_KHR_DEFERRED_HOST_OPERATIONS_EXTENSION_NAME}};
+	vector<string> raytracing_exts{
+		{VK_KHR_ACCELERATION_STRUCTURE_EXTENSION_NAME, VK_KHR_RAY_TRACING_PIPELINE_EXTENSION_NAME,
+		 VK_KHR_DEFERRED_HOST_OPERATIONS_EXTENSION_NAME, VK_KHR_RAY_QUERY_EXTENSION_NAME}};
 	if(allOf(raytracing_exts,
 			 [&](const string &ext) { return anyOf(phys_info.extensions, ext); })) {
 		insertBack(exts, raytracing_exts);
diff --git a/src/vulkan/vulkan_pipeline.cpp b/src/vulkan/vulkan_pipeline.cpp
index 7bd722a9..e8d20371 100644
--- a/src/vulkan/vulkan_pipeline.cpp
+++ b/src/vulkan/vulkan_pipeline.cpp
@@ -180,7 +180,7 @@ void VDescriptorSet::set(int index, PVAccelStruct as) {
 	write.dstSet = handle;
 	write.dstBinding = index;
 	write.dstArrayElement = 0;
-	write.descriptorType = toVk(VDescriptorType::storage_image);
+	write.descriptorType = toVk(VDescriptorType::accel_struct);
 	write.pNext = &as_info;
 	vkUpdateDescriptorSets(device->handle(), 1, &write, 0, nullptr);
 }
diff --git a/src/vulkan/vulkan_ray_tracing.cpp b/src/vulkan/vulkan_ray_tracing.cpp
index f35e056c..439ff51b 100644
--- a/src/vulkan/vulkan_ray_tracing.cpp
+++ b/src/vulkan/vulkan_ray_tracing.cpp
@@ -28,7 +28,7 @@ Ex<PVAccelStruct> VulkanAccelStruct::create(VulkanDevice &device, VAccelStructTy
 		VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR};
 	create_info.buffer = buffer.buffer().handle();
 	create_info.offset = buffer.byteOffset();
-	create_info.size = buffer.byteOffset();
+	create_info.size = buffer.byteSize();
 	create_info.type = VkAccelerationStructureTypeKHR(type);
 
 	VkAccelerationStructureKHR handle = 0;
@@ -37,14 +37,21 @@ Ex<PVAccelStruct> VulkanAccelStruct::create(VulkanDevice &device, VAccelStructTy
 	return device.createObject(handle, buffer.buffer());
 }
 
-template <class T> static u64 getAddress(VulkanDevice &device, VBufferSpan<T> buffer) {
+static u64 getAddress(VulkanDevice &device, const VulkanBuffer &buffer) {
 	VkBufferDeviceAddressInfo info = {VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO};
-	info.buffer = buffer.buffer().handle();
-	return vkGetBufferDeviceAddress(device.handle(), &info) + buffer.byteOffset();
+	info.buffer = buffer.handle();
+	return vkGetBufferDeviceAddress(device.handle(), &info);
+}
+
+template <class T> static u64 getAddress(VulkanDevice &device, VBufferSpan<T> buffer) {
+	return getAddress(device, *buffer.buffer()) + buffer.byteOffset();
 }
 
 Ex<PVAccelStruct> VulkanAccelStruct::build(VulkanDevice &device, VBufferSpan<float3> vertices,
 										   VBufferSpan<u32> indices) {
+	DASSERT(vertices.buffer()->usage() & VBufferUsage::accel_struct_build_input_read_only);
+	DASSERT(indices.buffer()->usage() & VBufferUsage::accel_struct_build_input_read_only);
+
 	VkAccelerationStructureGeometryTrianglesDataKHR triangles{
 		VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_TRIANGLES_DATA_KHR};
 	triangles.vertexFormat = VK_FORMAT_R32G32B32_SFLOAT;
@@ -61,11 +68,12 @@ Ex<PVAccelStruct> VulkanAccelStruct::build(VulkanDevice &device, VBufferSpan<flo
 	geometry.flags = VK_GEOMETRY_OPAQUE_BIT_KHR;
 	geometry.geometry.triangles = triangles;
 
-	VkAccelerationStructureBuildRangeInfoKHR offset;
-	offset.firstVertex = vertices.byteOffset() / sizeof(float3);
-	offset.primitiveCount = indices.size() / 3;
-	offset.primitiveOffset = 0;
-	offset.transformOffset = 0;
+	VkAccelerationStructureBuildRangeInfoKHR build_range_info;
+	build_range_info.firstVertex = vertices.byteOffset() / sizeof(float3);
+	build_range_info.primitiveCount = indices.size() / 3;
+	build_range_info.primitiveOffset = 0;
+	build_range_info.transformOffset = 0;
+	auto *build_range_infos = &build_range_info;
 
 	VkAccelerationStructureBuildGeometryInfoKHR build_info{
 		VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR};
@@ -79,22 +87,28 @@ Ex<PVAccelStruct> VulkanAccelStruct::build(VulkanDevice &device, VBufferSpan<flo
 		VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR};
 	uint32_t prim_count = indices.size() / 3;
 
-	vkGetAccelerationStructureBuildSizesKHR(
-		device.handle(),
-		VkAccelerationStructureBuildTypeKHR::VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR,
-		&build_info, &prim_count, &size_info);
+	vkGetAccelerationStructureBuildSizesKHR(device.handle(),
+											VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR,
+											&build_info, &prim_count, &size_info);
 
 	auto buffer = EX_PASS(VulkanBuffer::create(device, size_info.accelerationStructureSize,
 											   VBufferUsage::accel_struct_storage));
 	auto accel = EX_PASS(VulkanAccelStruct::create(device, VAccelStructType::bottom_level, buffer));
 
+	accel->m_scratch_buffer =
+		EX_PASS(VulkanBuffer::create(device, size_info.buildScratchSize,
+									 VBufferUsage::device_address | VBufferUsage::storage_buffer));
+	build_info.scratchData.deviceAddress = getAddress(device, *accel->m_scratch_buffer);
+
 	build_info.srcAccelerationStructure = accel->handle();
 	build_info.dstAccelerationStructure = accel->handle();
 
-	auto *offsets = &offset;
-
-	auto result =
-		vkBuildAccelerationStructuresKHR(device.handle(), nullptr, 1, &build_info, &offsets);
+	auto &cmds = device.cmdQueue();
+	auto cmd_handle = cmds.bufferHandle();
+	vkCmdBuildAccelerationStructuresKHR(cmd_handle, 1, &build_info, &build_range_infos);
+	// TODO: barriers here in case of multiple builds
+	// TODO: compacting
+	// TODO: clear scratch buffer once building is done
 
 	return accel;
 }
diff --git a/src/vulkan/vulkan_shader.cpp b/src/vulkan/vulkan_shader.cpp
index ec69988d..7ce439e0 100644
--- a/src/vulkan/vulkan_shader.cpp
+++ b/src/vulkan/vulkan_shader.cpp
@@ -27,11 +27,14 @@ Ex<vector<VDescriptorBindingInfo>> getBindings(CSpan<char> bytecode, VShaderStag
 
 	for(int i : intRange(reflection->descriptor_binding_count)) {
 		auto &binding = reflection->descriptor_bindings[i];
-		uint desc_type = uint(binding.descriptor_type);
-		if(desc_type > count<VDescriptorType>)
-			return ERROR("Unsupported descriptor type: %", desc_type);
-		out.emplace_back(VDescriptorType(desc_type), flag(stage), binding.binding, binding.count,
-						 binding.set);
+		VDescriptorType desc_type;
+		if(binding.descriptor_type <= SPV_REFLECT_DESCRIPTOR_TYPE_INPUT_ATTACHMENT)
+			desc_type = VDescriptorType(binding.descriptor_type);
+		else if(binding.descriptor_type == SPV_REFLECT_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR)
+			desc_type = VDescriptorType::accel_struct;
+		else
+			return ERROR("Unsupported descriptor type: %", binding.descriptor_type);
+		out.emplace_back(desc_type, flag(stage), binding.binding, binding.count, binding.set);
 	}
 
 	// TODO: is this needed?
diff --git a/todo.txt b/todo.txt
index 8ec4d1b0..7d7b413f 100644
--- a/todo.txt
+++ b/todo.txt
@@ -12,6 +12,7 @@ CAŁY CZAS TO ROBISZ :(
 
 
 Problemy:
+- natstepfilter
 - remove min_size from Span<>
 - disable/remove backtraces?
 - drobny błąd przy wyświetlaniu perfanalyzera: jak sie zmniejszy okno, to ostatnia linia moze byc czasami