//! Vulkan Commands

use vk::*;
use {VkHandle, Device, DeviceChild};
#[cfg(feature = "Implements")]
use VkResultHandler;
#[cfg(feature = "Implements")]
use std::mem::{size_of, transmute};
use std::ops::Range;
use std::borrow::Borrow;
use {Image, Buffer, ImageLayout};
#[cfg(feature = "Implements")]
use {Framebuffer, RenderPass, Pipeline, PipelineLayout, PipelineStageFlags, ShaderStage};
#[cfg(feature = "Implements")]
use {StencilFaceMask, FilterMode, Event};
#[cfg(feature = "Implements")]
use {QueryPipelineStatisticFlags, QueryPool, QueryResultFlags};

/// Opaque handle to a command pool object
#[derive(Clone)] pub struct CommandPool(VkCommandPool, ::Device);
/// Opaque handle to a command buffer object
#[repr(C)] #[derive(Clone, Copy)] pub struct CommandBuffer(VkCommandBuffer);

#[cfg(feature = "Implements")] DeviceChildCommonDrop!{ for CommandPool[vkDestroyCommandPool] }
impl VkHandle for CommandPool   { type Handle = VkCommandPool;   fn native_ptr(&self) -> VkCommandPool   { self.0 } }
impl VkHandle for CommandBuffer { type Handle = VkCommandBuffer; fn native_ptr(&self) -> VkCommandBuffer { self.0 } }
impl DeviceChild for CommandPool { fn device(&self) -> &Device { &self.1 } }

/// The recording state of commandbuffers
#[cfg(feature = "Implements")]
pub struct CmdRecord<'d> { ptr: &'d CommandBuffer, layout: [Option<VkPipelineLayout>; 2] }

/// Implicitly closing the recording state. This may cause a panic when there are errors in commands
#[cfg(feature = "Implements")]
impl<'d> Drop for CmdRecord<'d>
{
	fn drop(&mut self)
	{
		unsafe
		{
			vkEndCommandBuffer(self.ptr.native_ptr()).into_result().expect("Error closing command recording state");
		}
	}
}

/// Following methods are enabled with [feature = "Implements"]
#[cfg(feature = "Implements")]
impl CommandPool
{
	/// Create a new command pool object
	/// # Failures
	/// On failure, this command returns
	///
	/// * `VK_ERROR_OUT_OF_HOST_MEMORY`
	/// * `VK_ERROR_OUT_OF_DEVICE_MEMORY`
	pub fn new(device: &Device, queue_family: u32, transient: bool, indiv_resettable: bool) -> ::Result<Self>
	{
		let cinfo = VkCommandPoolCreateInfo
		{
			queueFamilyIndex: queue_family, flags: if transient { VK_COMMAND_POOL_CREATE_TRANSIENT_BIT } else { 0 }
				| if indiv_resettable { VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT } else { 0 },
			.. Default::default()
		};
		let mut h = VK_NULL_HANDLE as _;
		unsafe
		{
			vkCreateCommandPool(device.native_ptr(), &cinfo, ::std::ptr::null(), &mut h)
				.into_result().map(|_| CommandPool(h, device.clone()))
		}
	}
	/// Allocate command buffers from an existing command pool
	/// # Failures
	/// On failure, this command returns
	///
	/// * `VK_ERROR_OUT_OF_HOST_MEMORY`
	/// * `VK_ERROR_OUT_OF_DEVICE_MEMORY`
	pub fn alloc(&self, count: u32, primary: bool) -> ::Result<Vec<CommandBuffer>>
	{
		let ainfo = VkCommandBufferAllocateInfo
		{
			commandBufferCount: count, level: if primary { VK_COMMAND_BUFFER_LEVEL_PRIMARY } else { VK_COMMAND_BUFFER_LEVEL_SECONDARY },
			commandPool: self.0, .. Default::default()
		};
		let mut hs = vec![VK_NULL_HANDLE as _; count as _];
		unsafe
		{
			vkAllocateCommandBuffers(self.1.native_ptr(), &ainfo, hs.as_mut_ptr()).into_result().map(|_| transmute(hs))
		}
	}
    /// Resets a command pool
    /// # Safety
    /// Application cannot use command buffers after this call
    /// # Failures
    /// On failure, this command returns
	///
    /// * `VK_ERROR_OUT_OF_HOST_MEMORY`
    /// * `VK_ERROR_OUT_OF_DEVICE_MEMORY`
	pub fn reset(&self, release_resources: bool) -> ::Result<()>
	{
		let flags = if release_resources { VK_COMMAND_POOL_RESET_RELEASE_RESOURCES_BIT } else { 0 };
		unsafe { vkResetCommandPool(self.1.native_ptr(), self.0, flags).into_result() }
	}
	/// Free command buffers
	pub fn free(&self, buffers: &[CommandBuffer])
	{
		unsafe { vkFreeCommandBuffers(self.1.native_ptr(), self.0, buffers.len() as _, buffers.as_ptr() as *const _) };
	}
}

/// Following methods are enabled with [feature = "Implements"]
#[cfg(feature = "Implements")]
impl CommandBuffer
{
	/// Start recording a primary command buffer
	/// # Failures
	/// On failure, this command returns
	///
	/// * `VK_ERROR_OUT_OF_HOST_MEMORY`
	/// * `VK_ERROR_OUT_OF_DEVICE_MEMORY`
	pub fn begin(&self) -> ::Result<CmdRecord>
	{
		unsafe
		{
			vkBeginCommandBuffer(self.0, &Default::default()).into_result()
				.map(|_| CmdRecord { ptr: self, layout: [None, None] })
		}
	}
	/// Start recording a primary command buffer that will be submitted once
	/// # Failures
	/// On failure, this command returns
	/// 
	/// * `VK_ERROR_OUT_OF_HOST_MEMORY`
	/// * `VK_ERROR_OUT_OF_DEVICE_MEMORY`
	pub fn begin_once(&self) -> ::Result<CmdRecord>
	{
		let info = VkCommandBufferBeginInfo { flags: VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT, .. Default::default() };
		unsafe
		{
			vkBeginCommandBuffer(self.0, &info).into_result().map(|_| CmdRecord { ptr: self, layout: [None, None] })
		}
	}
	/// Start recording a secondary command buffer
	/// # Failures
	/// On failure, this command returns
	///
	/// * `VK_ERROR_OUT_OF_HOST_MEMORY`
	/// * `VK_ERROR_OUT_OF_DEVICE_MEMORY`
	pub fn begin_inherit(&self, renderpass: Option<(&Framebuffer, &RenderPass, u32)>,
		query: Option<(OcclusionQuery, QueryPipelineStatisticFlags)>) -> ::Result<CmdRecord>
	{
		let flags = if renderpass.is_some() { VK_COMMAND_BUFFER_USAGE_RENDER_PASS_CONTINUE_BIT } else { 0 };
		let (fb, rp, s) = renderpass.map(|(f, r, s)| (f.native_ptr(), r.native_ptr(), s))
			.unwrap_or((VK_NULL_HANDLE as _, VK_NULL_HANDLE as _, 0));
		let (oq, psq) = query.map(|(o, p)| (o, p.0)).unwrap_or((OcclusionQuery::Disable, 0));
		let inherit = VkCommandBufferInheritanceInfo
		{
			framebuffer: fb, renderPass: rp, subpass: s, occlusionQueryEnable: (oq != OcclusionQuery::Disable) as _,
			queryFlags: if oq == OcclusionQuery::Precise { VK_QUERY_CONTROL_PRECISE_BIT } else { 0 },
			pipelineStatistics: psq, .. Default::default()
		};
		let binfo = VkCommandBufferBeginInfo { pInheritanceInfo: &inherit, flags, .. Default::default() };
		unsafe
		{
			vkBeginCommandBuffer(self.0, &binfo).into_result().map(|_| CmdRecord { ptr: self, layout: [None, None] })
		}
	}
}

/// [feature = "Implements"] Graphics/Compute Commands: Pipeline Setup
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Bind a pipeline object to a command buffer
	pub fn bind_graphics_pipeline(&mut self, pipeline: &Pipeline) -> &mut Self
	{
		unsafe { vkCmdBindPipeline(self.ptr.native_ptr(), VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline.native_ptr()) };
		return self;
	}
	/// Bind a pipeline object to a command buffer
	pub fn bind_compute_pipeline(&mut self, pipeline: &Pipeline) -> &mut Self
	{
		unsafe { vkCmdBindPipeline(self.ptr.native_ptr(), VK_PIPELINE_BIND_POINT_COMPUTE, pipeline.native_ptr()) };
		return self;
	}
	/// Bind a pipeline layout object to a command buffer
	pub fn bind_graphics_pipeline_layout(&mut self, layout: &PipelineLayout) -> &mut Self
	{
		self.layout[VK_PIPELINE_BIND_POINT_GRAPHICS as usize] = Some(layout.native_ptr());
		return self;
	}
	/// Bind a pipeline layout object to a command buffer
	pub fn bind_compute_pipeline_layout(&mut self, layout: &PipelineLayout) -> &mut Self
	{
		self.layout[VK_PIPELINE_BIND_POINT_COMPUTE as usize] = Some(layout.native_ptr());
		return self;
	}
	/// Bind a pipeline object and a pipeline layout object to a command buffer
	pub fn bind_graphics_pipeline_pair(&mut self, pipeline: &Pipeline, layout: &PipelineLayout) -> &mut Self
	{
		self.bind_graphics_pipeline_layout(layout).bind_graphics_pipeline(pipeline)
	}
	/// Bind a pipeline object and a pipeline layout object to a command buffer
	pub fn bind_compute_pipeline_pair(&mut self, pipeline: &Pipeline, layout: &PipelineLayout) -> &mut Self
	{
		self.bind_compute_pipeline_layout(layout).bind_compute_pipeline(pipeline)
	}
	fn current_pipeline_layout_g(&self) -> VkPipelineLayout
	{
		self.layout[VK_PIPELINE_BIND_POINT_GRAPHICS as usize].expect("Pipeline is not bound for Graphics")
	}
	fn current_pipeline_layout_c(&self) -> VkPipelineLayout
	{
		self.layout[VK_PIPELINE_BIND_POINT_COMPUTE as usize].expect("Pipeline is not bound for Compute")
	}
	/// Binds descriptor sets to a command buffer
	pub fn bind_graphics_descriptor_sets(&mut self, first: u32,
		descriptor_sets: &[VkDescriptorSet], dynamic_offsets: &[u32]) -> &mut Self
	{
		unsafe
		{
			vkCmdBindDescriptorSets(self.ptr.native_ptr(), VK_PIPELINE_BIND_POINT_GRAPHICS,
				self.current_pipeline_layout_g(),
				first, descriptor_sets.len() as _, descriptor_sets.as_ptr(),
				dynamic_offsets.len() as _, dynamic_offsets.as_ptr())
		};
		return self;
	}
	/// Binds descriptor sets to a command buffer
	pub fn bind_compute_descriptor_sets(&mut self, first: u32,
		descriptor_sets:&[VkDescriptorSet], dynamic_offsets: &[u32]) -> &mut Self
	{
		unsafe
		{ 
			vkCmdBindDescriptorSets(self.ptr.native_ptr(), VK_PIPELINE_BIND_POINT_COMPUTE,
				self.current_pipeline_layout_c(),
				first, descriptor_sets.len() as _, descriptor_sets.as_ptr(),
				dynamic_offsets.len() as _, dynamic_offsets.as_ptr())
		};
		return self;
	}
	/// Update the value of push constant
	pub fn push_graphics_constant<T>(&mut self, stage: ShaderStage, offset: u32, value: &T) -> &mut Self
	{
		unsafe
		{
			vkCmdPushConstants(self.ptr.native_ptr(), self.current_pipeline_layout_g(),
				stage.0, offset, size_of::<T>() as _, value as *const T as *const _);
		}
		return self;
	}
	/// Update the value of push constant
	pub fn push_compute_constant<T>(&mut self, stage: ShaderStage, offset: u32, value: &T) -> &mut Self
	{
		unsafe
		{
			vkCmdPushConstants(self.ptr.native_ptr(), self.current_pipeline_layout_c(),
				stage.0, offset, size_of::<T>() as _, value as *const T as *const _);
		}
		return self;
	}

	/// Push descriptor updates into a command buffer
	#[cfg(feature = "VK_KHR_push_descriptor")]
	pub fn push_graphics_descriptor_set(&mut self, set: u32, writes: &[DescriptorSetWriteInfo]) -> &mut Self
	{
		// save flatten results
		let wt = writes.iter().map(|x|
		{
			let (ty, cnt, iv, bv, bvv) = x.3.decomposite();
			let ivs = iv.iter().map(|&(s, v, l)| VkDescriptorImageInfo
			{
				sampler: s.unwrap_or(VK_NULL_HANDLE as _), imageView: v, imageLayout: l as _
			}).collect::<Vec<_>>();
			let bvs = bv.iter()
				.map(|&(b, ref r)| VkDescriptorBufferInfo { buffer: b, offset: r.start as _, range: r.len() as _ })
				.collect::<Vec<_>>();
			(x.0, x.1, x.2, ty, cnt, ivs, bvs, bvv)
		}).collect::<Vec<_>>();
		let w = wt.iter().map(|&(set, binding, array, dty, count, ref iv, ref bv, ref bvv)| VkWriteDescriptorSet
		{
			dstSet: set, dstBinding: binding, dstArrayElement: array, descriptorType: dty as _, descriptorCount: count,
			pImageInfo: iv.as_ptr(), pBufferInfo: bv.as_ptr(), pTexelBufferView: bvv.as_ptr(), .. Default::default()
		}).collect::<Vec<_>>();
		unsafe
		{
			vkCmdPushDescriptorSetKHR(self.ptr.native_ptr(), VK_PIPELINE_BIND_POINT_GRAPHICS,
				self.current_pipeline_layout_g(), set, w.len() as _, w.as_ptr())
		};
		return self;
	}
	/// Push descriptor updates into a command buffer
	#[cfg(feature = "VK_KHR_push_descriptor")]
	pub fn push_compute_descriptor_set(&mut self, set: u32, writes: &[DescriptorSetWriteInfo]) -> &mut Self
	{
		// save flatten results
		let wt = writes.iter().map(|x|
		{
			let (ty, cnt, iv, bv, bvv) = x.3.decomposite();
			let ivs = iv.iter().map(|&(s, v, l)| VkDescriptorImageInfo
			{
				sampler: s.unwrap_or(VK_NULL_HANDLE as _), imageView: v, imageLayout: l as _
			}).collect::<Vec<_>>();
			let bvs = bv.iter()
				.map(|&(b, ref r)| VkDescriptorBufferInfo { buffer: b, offset: r.start as _, range: r.len() as _ })
				.collect::<Vec<_>>();
			(x.0, x.1, x.2, ty, cnt, ivs, bvs, bvv)
		}).collect::<Vec<_>>();
		let w = wt.iter().map(|&(set, binding, array, dty, count, ref iv, ref bv, ref bvv)| VkWriteDescriptorSet
		{
			dstSet: set, dstBinding: binding, dstArrayElement: array, descriptorType: dty as _, descriptorCount: count,
			pImageInfo: iv.as_ptr(), pBufferInfo: bv.as_ptr(), pTexelBufferView: bvv.as_ptr(), .. Default::default()
		}).collect::<Vec<_>>();
		unsafe
		{
			vkCmdPushDescriptorSetKHR(self.ptr.native_ptr(), VK_PIPELINE_BIND_POINT_COMPUTE,
				self.current_pipeline_layout_c(), set, w.len() as _, w.as_ptr())
		};
		return self;
	}
}

/// [feature = "Implements"] Graphics Commands: Updating dynamic states
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Set the viewport on a command buffer
	pub fn set_viewport(&mut self, first: u32, viewports: &[VkViewport]) -> &mut Self
	{
		unsafe { vkCmdSetViewport(self.ptr.native_ptr(), first, viewports.len() as _, viewports.as_ptr()) };
		return self;
	}
	/// Set the dynamic scissor rectangles on a command buffer
	pub fn set_scissor(&mut self, first: u32, scissors: &[VkRect2D]) -> &mut Self
	{
		unsafe { vkCmdSetScissor(self.ptr.native_ptr(), first, scissors.len() as _, scissors.as_ptr()) };
		return self;
	}
	/// Set the dynamic line width state
	pub fn set_line_width(&mut self, w: f32) -> &Self
	{
		unsafe { vkCmdSetLineWidth(self.ptr.native_ptr(), w) };
		return self;
	}
	/// Set the depth bias dynamic state
	pub fn set_depth_bias(&mut self, constant_factor: f32, clamp: f32, slope_factor: f32) -> &mut Self
	{
		unsafe { vkCmdSetDepthBias(self.ptr.native_ptr(), constant_factor, clamp, slope_factor) };
		return self;
	}
	/// Set the values of blend constants
	pub fn set_blend_constants(&mut self, blend_constants: [f32; 4]) -> &mut Self
	{
		unsafe { vkCmdSetBlendConstants(self.ptr.native_ptr(), blend_constants) };
		return self;
	}
	/// Set the depth bounds test values for a command buffer
	pub fn set_depth_bounds(&mut self, bounds: Range<f32>) -> &mut Self
	{
		unsafe { vkCmdSetDepthBounds(self.ptr.native_ptr(), bounds.start, bounds.end) };
		return self;
	}
	/// Set the stencil compare mask dynamic state
	pub fn set_stencil_compare_mask(&mut self, face_mask: StencilFaceMask, compare_mask: u32) -> &mut Self
	{
		unsafe { vkCmdSetStencilCompareMask(self.ptr.native_ptr(), face_mask as _, compare_mask) };
		return self;
	}
	/// Set the stencil write mask dynamic state
	pub fn set_stencil_write_mask(&mut self, face_mask: StencilFaceMask, write_mask: u32) -> &mut Self
	{
		unsafe { vkCmdSetStencilWriteMask(self.ptr.native_ptr(), face_mask as _, write_mask) };
		return self;
	}
	/// Set the stencil reference dynamic state
	pub fn set_stencil_reference(&mut self, face_mask: StencilFaceMask, reference: u32) -> &mut Self
	{
		unsafe { vkCmdSetStencilReference(self.ptr.native_ptr(), face_mask as _, reference) };
		return self;
	}
	/// [feature = "VK_EXT_sample_locations"]
	/// Set the sample locations state
	#[cfg(feature = "VK_EXT_sample_locations")]
	pub fn set_sample_locations(&mut self, info: &VkSampleLocationsInfoEXT) -> &mut Self
	{
		unsafe { vkCmdSetSampleLocationsEXT(self.ptr.native_ptr(), info as _); }
		return self;
	}
}

/// [feature = "Implements"] Graphics Commands: Binding Buffers
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Bind an index buffer to a command buffer
	pub fn bind_index_buffer(&mut self, buffer: &Buffer, offset: usize, index_type: IndexType) -> &mut Self
	{
		unsafe { vkCmdBindIndexBuffer(self.ptr.native_ptr(), buffer.native_ptr(), offset as _, index_type as _) };
		return self;
	}
	/// Bind vertex buffers to a command buffer
	pub fn bind_vertex_buffers(&mut self, first: u32, buffers: &[(&Buffer, usize)]) -> &mut Self
	{
		let (bufs, ofs): (Vec<_>, Vec<_>) =
			buffers.into_iter().map(|&(b, o)| (b.native_ptr(), o as VkDeviceSize)).unzip();
		unsafe { vkCmdBindVertexBuffers(self.ptr.native_ptr(), first, bufs.len() as _, bufs.as_ptr(), ofs.as_ptr()) };
		return self;
	}
}

/// [feature = "Implements"] Graphics Commands: Inside a Render Pass
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Draw primitives
	pub fn draw(&mut self, vertex_count: u32, instance_count: u32, first_vertex: u32, first_instance: u32) -> &mut Self
	{
		unsafe { vkCmdDraw(self.ptr.native_ptr(), vertex_count, instance_count, first_vertex, first_instance) };
		return self;
	}
	/// Issue an indexed draw into a command buffer
	pub fn draw_indexed(&mut self, index_count: u32, instance_count: u32,
		first_index: u32, vertex_offset: i32, first_instance: u32) -> &mut Self
	{
		unsafe
		{
			vkCmdDrawIndexed(self.ptr.native_ptr(), index_count, instance_count,
				first_index, vertex_offset, first_instance)
		};
		return self;
	}
	/// Issue an indirect draw into a command buffer
	pub fn draw_indirect(&mut self, buffer: &Buffer, offset: usize, draw_count: u32, stride: u32) -> &mut Self
	{
		unsafe { vkCmdDrawIndirect(self.ptr.native_ptr(), buffer.native_ptr(), offset as _, draw_count, stride) };
		return self;
	}
	/// Perform an indexed indirect draw
	pub fn draw_indexed_indirect(&mut self, buffer: &Buffer, offset: usize, draw_count: u32, stride: u32) -> &mut Self
	{
		unsafe
		{
			vkCmdDrawIndexedIndirect(self.ptr.native_ptr(), buffer.native_ptr(), offset as _, draw_count, stride)
		};
		return self;
	}
}

/// [feature = "Implements"] Compute Commands: Dispatching kernels
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Dispatch compute work items
	pub fn dispatch(&mut self, group_count_x: u32, group_count_y: u32, group_count_z: u32) -> &mut Self
	{
		unsafe { vkCmdDispatch(self.ptr.native_ptr(), group_count_x, group_count_y, group_count_z) };
		return self;
	}
	/// Dispatch compute work items using indirect parameters
	pub fn dispatch_indirect(&mut self, buffer: &Buffer, offset: usize) -> &mut Self
	{
		unsafe { vkCmdDispatchIndirect(self.ptr.native_ptr(), buffer.native_ptr(), offset as _) };
		return self;
	}
}

/// [feature = "Implements"] Transfer Commands: Copying resources
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Copy data between buffer regions
	pub fn copy_buffer(&mut self, src: &Buffer, dst: &Buffer, regions: &[VkBufferCopy]) -> &mut Self
	{
		unsafe
		{
			vkCmdCopyBuffer(self.ptr.native_ptr(), src.native_ptr(),
				dst.native_ptr(), regions.len() as _, regions.as_ptr())
		};
		return self;
	}
	/// Copy data between images
	pub fn copy_image(&mut self, src: &Image, src_layout: ImageLayout,
		dst: &Image, dst_layout: ImageLayout, regions: &[VkImageCopy]) -> &mut Self
	{
		unsafe
		{
			vkCmdCopyImage(self.ptr.native_ptr(), src.native_ptr(), src_layout as _,
				dst.native_ptr(), dst_layout as _, regions.len() as _, regions.as_ptr())
		};
		return self;
	}
	/// Copy regions of an image, potentially performing format conversion
	pub fn blit_image(&mut self, src: &Image, src_layout: ImageLayout, dst: &Image, dst_layout: ImageLayout,
		regions: &[VkImageBlit], filter: FilterMode) -> &mut Self
	{
		unsafe
		{
			vkCmdBlitImage(self.ptr.native_ptr(), src.native_ptr(), src_layout as _, dst.native_ptr(), dst_layout as _,
				regions.len() as _, regions.as_ptr(), filter as _)
		};
		return self;
	}
	/// Copy data from a buffer into an image
	pub fn copy_buffer_to_image(&mut self, src_buffer: &Buffer, dst_image: &Image, dst_layout: ImageLayout,
		regions: &[VkBufferImageCopy]) -> &mut Self
	{
		unsafe
		{
			vkCmdCopyBufferToImage(self.ptr.native_ptr(), src_buffer.native_ptr(),
				dst_image.native_ptr(), dst_layout as _, regions.len() as _, regions.as_ptr())
		};
		return self;
	}
	/// Copy image data into a buffer
	pub fn copy_image_to_buffer(&mut self, src_image: &Image, src_layout: ImageLayout, dst_buffer: &Buffer,
		regions: &[VkBufferImageCopy]) -> &mut Self
	{
		unsafe
		{
			vkCmdCopyImageToBuffer(self.ptr.native_ptr(), src_image.native_ptr(), src_layout as _,
				dst_buffer.native_ptr(), regions.len() as _, regions.as_ptr())
		};
		return self;
	}
	/// Update a buffer's contents from host memory
	pub fn update_buffer<T>(&mut self, dst: &Buffer, dst_offset: usize, size: usize, data: &T) -> &mut Self
	{
		assert!(size <= size_of::<T>(), "Updated size exceeds size of datatype");
		unsafe
		{
			vkCmdUpdateBuffer(self.ptr.native_ptr(), dst.native_ptr(), dst_offset as _, size as _,
				data as *const T as *const _)
		};
		return self;
	}
}

/// [feature = "Implements"] Graphics/Compute Commands: Transfer-like(clearing/filling) commands
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Fill a region of a buffer with a fixed value.  
	/// `size` is number of bytes to fill
	pub fn fill_buffer(&mut self, dst: &Buffer, dst_offset: usize, size: usize, data: u32) -> &mut Self
	{
		unsafe { vkCmdFillBuffer(self.ptr.native_ptr(), dst.native_ptr(), dst_offset as _, size as _, data) };
		return self;
	}
	/// Clear regions of a color image
	pub fn clear_color_image<T: ClearColorValue>(&mut self, image: &Image, layout: ImageLayout,
		color: &T, ranges: &[VkImageSubresourceRange]) -> &mut Self
	{
		unsafe
		{
			vkCmdClearColorImage(self.ptr.native_ptr(), image.native_ptr(), layout as _,
				color.represent(), ranges.len() as _, ranges.as_ptr())
		};
		return self;
	}
	/// Fill regions of a combined depth/stencil image
	pub fn clear_depth_stencil_image(&mut self, image: &Image, layout: ImageLayout, depth: f32, stencil: u32,
		ranges: &[VkImageSubresourceRange]) -> &mut Self
	{
		unsafe
		{
			vkCmdClearDepthStencilImage(self.ptr.native_ptr(), image.native_ptr(),
				layout as _, &VkClearDepthStencilValue { depth, stencil }, ranges.len() as _, ranges.as_ptr())
		};
		return self;
	}
	/// Clear regions within currently bound framebuffer attachments
	pub fn clear_attachments(&mut self, attachments: &[VkClearAttachment], rects: &[VkClearRect]) -> &mut Self
	{
		unsafe
		{
			vkCmdClearAttachments(self.ptr.native_ptr(), attachments.len() as _,
				attachments.as_ptr(), rects.len() as _, rects.as_ptr())
		};
		return self;
	}
}

/// [feature = "Implements"] Graphics Commands: Executing Subcommands
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Execute a secondary command buffer from a primary command buffer
	/// # Safety
	/// 
	/// Caller must be primary buffer and in the render pass when executing secondary command buffer
	pub unsafe fn execute_commands(&mut self, buffers: &[VkCommandBuffer]) -> &mut Self
	{
		vkCmdExecuteCommands(self.ptr.native_ptr(), buffers.len() as _, buffers.as_ptr());
		return self;
	}
}

/// [feature = "Implements"] Graphics Commands: Resolving an image to another image
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Resolve regions of an image
	pub fn resolve_image(&mut self, src: &Image, src_layout: ImageLayout, dst: &Image, dst_layout: ImageLayout,
		regions: &[VkImageResolve]) -> &mut Self
	{
		unsafe
		{
			vkCmdResolveImage(self.ptr.native_ptr(), src.native_ptr(), src_layout as _,
				dst.native_ptr(), dst_layout as _, regions.len() as _, regions.as_ptr())
		};
		return self;
	}
}

/// [feature = "Implements"] Graphics/Compute Commands: Synchronization between command buffers/queues
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Set an event object to signaled state
	pub fn set_event(&mut self, event: &Event, stage_mask: PipelineStageFlags) -> &mut Self
	{
		unsafe { vkCmdSetEvent(self.ptr.native_ptr(), event.0, stage_mask.0) }; return self;
	}
	/// Reset an event object to non-signaled state
	pub fn reset_event(&mut self, event: &Event, stage_mask: PipelineStageFlags) -> &mut Self
	{
		unsafe { vkCmdResetEvent(self.ptr.native_ptr(), event.0, stage_mask.0) }; return self;
	}
	/// Wait for one or more events and insert a set of memory
	pub fn wait_events(&mut self, events: &[&Event],
		src_stage_mask: PipelineStageFlags, dst_stage_mask: PipelineStageFlags,
		memory_barriers: &[VkMemoryBarrier], buffer_memory_barriers: &[VkBufferMemoryBarrier],
		image_memory_barriers: &[VkImageMemoryBarrier]) -> &mut Self
	{
		let evs = events.into_iter().map(|x| x.0).collect::<Vec<_>>();
		unsafe
		{
			vkCmdWaitEvents(self.ptr.native_ptr(), evs.len() as _, evs.as_ptr(), src_stage_mask.0, dst_stage_mask.0,
				memory_barriers.len() as _, memory_barriers.as_ptr(),
				buffer_memory_barriers.len() as _, buffer_memory_barriers.as_ptr(),
				image_memory_barriers.len() as _, image_memory_barriers.as_ptr())
		};
		return self;
	}
	/// Insert a memory dependency
	pub fn pipeline_barrier(&mut self, src_stage_mask: PipelineStageFlags, dst_stage_mask: PipelineStageFlags,
		by_region: bool, memory_barriers: &[VkMemoryBarrier], buffer_memory_barriers: &[BufferMemoryBarrier],
		image_memory_barriers: &[ImageMemoryBarrier]) -> &mut Self
	{
		unsafe
		{
			vkCmdPipelineBarrier(self.ptr.native_ptr(), src_stage_mask.0, dst_stage_mask.0,
				if by_region { VK_DEPENDENCY_BY_REGION_BIT } else { 0 },
				memory_barriers.len() as _, memory_barriers.as_ptr(),
				buffer_memory_barriers.len() as _, buffer_memory_barriers.as_ptr() as _,
				image_memory_barriers.len() as _, image_memory_barriers.as_ptr() as _)
		};
		return self;
	}
}

/// [feature = "Implements"] Graphics/Compute Commands: Querying
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Begin a query
	pub fn begin_query(&mut self, pool: &QueryPool, query: u32, precise_query: bool) -> &mut Self
	{
		unsafe
		{
			vkCmdBeginQuery(self.ptr.native_ptr(), pool.0, query,
				if precise_query { VK_QUERY_CONTROL_PRECISE_BIT } else { 0 })
		};
		return self;
	}
	/// Ends a query
	pub fn end_query(&mut self, pool: &QueryPool, query: u32) -> &mut Self
	{
		unsafe { vkCmdEndQuery(self.ptr.native_ptr(), pool.0, query) }; return self;
	}
	/// Reset queries in a query pool
	pub fn reset_query_pool(&mut self, pool: &QueryPool, range: Range<u32>) -> &mut Self
	{
		unsafe { vkCmdResetQueryPool(self.ptr.native_ptr(), pool.0, range.start, range.end - range.start) };
		return self;
	}
	/// Write a device timestamp into a query object
	pub fn write_timestamp(&mut self, stage: PipelineStageFlags, pool: &QueryPool, query: u32) -> &mut Self
	{
		unsafe { vkCmdWriteTimestamp(self.ptr.native_ptr(), stage.0, pool.0, query) }; return self;
	}
	/// Copy the results of queries in a query pool to a buffer object
	pub fn copy_query_pool_results(&mut self, pool: &QueryPool, range: Range<u32>, dst: &Buffer, dst_offset: usize,
		stride: usize, wide_result: bool, flags: QueryResultFlags) -> &mut Self
	{
		unsafe
		{
			vkCmdCopyQueryPoolResults(self.ptr.native_ptr(), pool.0, range.start, range.end - range.start,
				dst.native_ptr(), dst_offset as _, stride as _,
				flags.0 | if wide_result { VK_QUERY_RESULT_64_BIT } else { 0 })
		};
		return self;
	}
}

/// [feature = "Implements"] Graphics Commands: Manipulating with Render Passes
#[cfg(feature = "Implements")]
impl<'d> CmdRecord<'d>
{
	/// Begin a new render pass
	pub fn begin_render_pass(&mut self, pass: &RenderPass, framebuffer: &Framebuffer, render_area: VkRect2D,
		clear_values: &[ClearValue], inline_commands: bool) -> &mut Self
	{
		let cvalues = clear_values.into_iter().map(|x| match x
		{
			&ClearValue::Color(ref color) => VkClearValue { color: VkClearColorValue { float32: color.clone() } },
			&ClearValue::DepthStencil(depth, stencil) =>
				VkClearValue { depthStencil: VkClearDepthStencilValue { depth, stencil } }
		}).collect::<Vec<_>>();
		let binfo = VkRenderPassBeginInfo
		{
			renderPass: pass.native_ptr(), framebuffer: framebuffer.native_ptr(), renderArea: render_area,
			clearValueCount: cvalues.len() as _, pClearValues: cvalues.as_ptr(), .. Default::default()
		};
		unsafe
		{
			vkCmdBeginRenderPass(self.ptr.native_ptr(), &binfo,
				if inline_commands { VK_SUBPASS_CONTENTS_INLINE } else { VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS })
		};
		return self;
	}
	/// Transition to the next subpass of a render pass
	pub fn next_subpass(&mut self, inline_commands: bool) -> &mut Self
	{
		unsafe
		{
			vkCmdNextSubpass(self.ptr.native_ptr(),
				if inline_commands { VK_SUBPASS_CONTENTS_INLINE } else { VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS })
		};
		return self;
	}
	/// End the current render pass
	pub fn end_render_pass(&mut self) -> &mut Self { unsafe { vkCmdEndRenderPass(self.ptr.native_ptr()) }; return self; }
}

/// The trait representation of `VkClearColorValue`
pub trait ClearColorValue
{
	fn represent(&self) -> &VkClearColorValue;
}
impl ClearColorValue for [f32; 4] { fn represent(&self) -> &VkClearColorValue { unsafe { ::std::mem::transmute(self) } } }
impl ClearColorValue for [i32; 4] { fn represent(&self) -> &VkClearColorValue { unsafe { ::std::mem::transmute(self) } } }
impl ClearColorValue for [u32; 4] { fn represent(&self) -> &VkClearColorValue { unsafe { ::std::mem::transmute(self) } } }

/// The enum representation of `VkClearValue`
pub enum ClearValue
{
	/// Color Value: r, g, b, a
	Color([f32; 4]),
	/// Depth and Stencil Value: depth, stencil
	DepthStencil(f32, u32)
}

/// Type of index buffer indices
#[repr(C)] #[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum IndexType
{
	/// Indices are 16-bit unsigned integer values
	U16 = VK_INDEX_TYPE_UINT16 as _,
	/// Indices are 32-bit unsigned integer values
	U32 = VK_INDEX_TYPE_UINT32 as _
}

/// Enabling or disabling the occlusion query
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum OcclusionQuery
{
	Disable, Enable,
	/// `VK_QUERY_CONTROL_PRECISE_BIT`
	Precise
}

/// Access Types
pub struct AccessFlags { pub read: VkAccessFlags, pub write: VkAccessFlags }
impl AccessFlags
{
	/// Specifies read access to an indirect command structure read as part of an indirect drawing or dispatch command.
	pub const INDIRECT_COMMAND_READ: VkAccessFlags = VK_ACCESS_INDIRECT_COMMAND_READ_BIT;
	/// Specifies read access to an index buffer as part of an indexed drawing command, bound by `vkCmdBindIndexBuffer`.
	pub const INDEX_READ: VkAccessFlags = VK_ACCESS_INDEX_READ_BIT;
	/// Specifies read access to a vertex buffer as part of a drawing command, bound by `vkCmdBindVertexBuffers`.
	pub const VERTEX_ATTRIBUTE_READ: VkAccessFlags = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT;
	/// Specifies read access to a [uniform buffer](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#descriptorsets-uniformbuffer).
	pub const UNIFORM_READ: VkAccessFlags = VK_ACCESS_UNIFORM_READ_BIT;
	/// Specifies read access to an [input attachment](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass) within a render pass during fragment shading.
	pub const INPUT_ATTACHMENT_READ: VkAccessFlags = VK_ACCESS_INPUT_ATTACHMENT_READ_BIT;
	/// Specifies read/write access to a [storage buffer](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#descriptorsets-storagebuffer),
	/// [uniform texel buffer](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#descriptorsets-uniformtexelbuffer)(read only),
	/// [storage texel buffer](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#descriptorsets-storagetexelbuffer),
	/// [samples image](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#descriptorsets-sampledimage)(read only),
	/// or [storage image](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#descriptorsets-storageimage).
	pub const SHADER: Self = AccessFlags { read: VK_ACCESS_SHADER_READ_BIT, write: VK_ACCESS_SHADER_WRITE_BIT };
	/// - `read`: Specifies read access to a [color attachment](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass),
	///   such as via [blending](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#framebuffer-blending),
	///   [logic operations](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#framebuffer-logicop),
	///   or via certain [subpass load operations](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#framebuffer-logicop).
	/// - `write`: specifies write access to a [color or resolve attachment](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass)
	///   during a [render pass](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass)
	///   or via certain [subpass load and store operations](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass-load-store-ops).
	pub const COLOR_ATTACHMENT: Self = AccessFlags
	{
		read: VK_ACCESS_COLOR_ATTACHMENT_READ_BIT, write: VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT
	};
	/// - `read`: Specifies read access to a [depth/stencil attachment](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass),
	///   via [depth or stencil operations](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#fragops-ds-state)
	///   or via certain [subpass load operations](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass-load-store-ops).
	/// - `write`: Specifies write access to a [depth/stencil attachment](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass),
	///   via [depth or stencil operations](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#fragops-ds-state)
	///   or via certain [subpass load and store operations](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#renderpass-load-store-ops).
	pub const DEPTH_STENCIL_ATTACHMENT: Self = AccessFlags
	{
		read: VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT, write: VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT
	};
	/// Specifies read/write access to an image or buffer in a [clear](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#clears)(write only)
	/// or [copy](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#copies) operation.
	pub const TRANSFER: Self = AccessFlags { read: VK_ACCESS_TRANSFER_READ_BIT, write: VK_ACCESS_TRANSFER_WRITE_BIT };
	/// Specifies read/write access by a host operation.
	/// Accesses of this type are not performed through a resource, but directly on memory.
	pub const HOST: Self = AccessFlags { read: VK_ACCESS_HOST_READ_BIT, write: VK_ACCESS_HOST_WRITE_BIT };
	/// Specifies read/write access via non-specific entities.
	/// These entities include the Vulkan device and host, but *may* also include entities external to the Vulkan device
	/// or otherwise not part of the core Vulkan pipeline.
	/// 
	/// - When the `write` mask included in a source access mask, all writes that are performed by entities known to the
	///   Vulkan device are made available.
	/// - When included in a destination access mask, makes all available writes visible to all future read accesses on
	///   entities known to the Vulkan device.
	pub const MEMORY: Self = AccessFlags { read: VK_ACCESS_MEMORY_READ_BIT, write: VK_ACCESS_MEMORY_WRITE_BIT };
}

use std::mem::replace;
/// Image Subresource Slice
#[derive(Clone)]
pub struct ImageSubref<'d>(pub &'d Image, pub VkImageSubresourceRange);
impl<'d> ImageSubref<'d>
{
	/// Construct a slice for the Color aspect(`VK_IMAGE_ASPECT_COLOR_BIT`)
	pub fn color<Levels, Layers>(image: &'d Image, mip_levels: Levels, array_layers: Layers) -> Self
		where Levels: ::AnalogNumRange<u32>, Layers: ::AnalogNumRange<u32>
	{
		ImageSubref(image, VkImageSubresourceRange
		{
			aspectMask: VK_IMAGE_ASPECT_COLOR_BIT,
			baseMipLevel: mip_levels.begin(), baseArrayLayer: array_layers.begin(),
			levelCount: mip_levels.count(), layerCount: array_layers.count()
		})
	}
	/// Construct a slice for the Stencil aspect(`VK_IMAGE_ASPECT_STENCIL_BIT`)
	pub fn stencil<Levels, Layers>(image: &'d Image, mip_levels: Levels, array_layers: Layers) -> Self
		where Levels: ::AnalogNumRange<u32>, Layers: ::AnalogNumRange<u32>
	{
		ImageSubref(image, VkImageSubresourceRange
		{
			aspectMask: VK_IMAGE_ASPECT_STENCIL_BIT,
			baseMipLevel: mip_levels.begin(), baseArrayLayer: array_layers.begin(),
			levelCount: mip_levels.count(), layerCount: array_layers.count()
		})
	}
}

/// Wrapper object of `VkImageMemoryBarrier`, derscribes a memory barrier of an image.
#[derive(Clone)]
pub struct ImageMemoryBarrier(VkImageMemoryBarrier);
impl ImageMemoryBarrier
{
	/// Construct a new barrier descriptor
	pub fn new(img: &ImageSubref, old_layout: ImageLayout, new_layout: ImageLayout) -> Self
	{
		ImageMemoryBarrier(VkImageMemoryBarrier
		{
			image: img.0.native_ptr(), subresourceRange: img.1.clone(),
			oldLayout: old_layout as _, newLayout: new_layout as _,
			srcAccessMask: old_layout.default_access_mask(),
			dstAccessMask: new_layout.default_access_mask(), .. Default::default()
		})
	}
	/// Construct a new barrier descriptor from discrete pair of resource and subresource range
	pub fn new_raw<SR>(res: &Image, subres: &SR, old: ImageLayout, new: ImageLayout) -> Self
		where SR: Borrow<VkImageSubresourceRange>
	{
		ImageMemoryBarrier(VkImageMemoryBarrier
		{
			image: res.native_ptr(), subresourceRange: subres.borrow().clone(),
			oldLayout: old as _, newLayout: new as _,
			srcAccessMask: old.default_access_mask(), dstAccessMask: new.default_access_mask(), .. Default::default()
		})
	}
	/// Update the source access mask
	pub fn src_access_mask(mut self, mask: VkAccessFlags) -> Self
	{
		self.0.srcAccessMask = mask; return self;
	}
	/// Update the destination access mask
	pub fn dest_access_mask(mut self, mask: VkAccessFlags) -> Self
	{
		self.0.dstAccessMask = mask; return self;
	}
	/// Flip access masks and image layouts
	pub fn flip(mut self) -> Self
	{
		self.0.dstAccessMask = replace(&mut self.0.srcAccessMask, self.0.dstAccessMask);
		self.0.newLayout = replace(&mut self.0.oldLayout, self.0.newLayout);
		return self;
	}
}
/// Wrapper object of `VkBufferMemoryBarrier`, describes a memory barrier of a buffer.
#[derive(Clone)]
pub struct BufferMemoryBarrier(VkBufferMemoryBarrier);
impl BufferMemoryBarrier
{
	/// Construct a new buffer descriptor
	pub fn new(buf: &Buffer, range: Range<usize>, src_access_mask: VkAccessFlags, dst_access_mask: VkAccessFlags)
		-> Self
	{
		BufferMemoryBarrier(VkBufferMemoryBarrier
		{
			buffer: buf.native_ptr(), offset: range.start as _, size: (range.end - range.start) as _,
			srcAccessMask: src_access_mask, dstAccessMask: dst_access_mask, .. Default::default()
		})
	}
	/// Update the source access mask
	pub fn src_access_mask(mut self, mask: VkAccessFlags) -> Self
	{
		self.0.srcAccessMask = mask; return self;
	}
	/// Update the destination access mask
	pub fn dest_access_mask(mut self, mask: VkAccessFlags) -> Self
	{
		self.0.dstAccessMask = mask; return self;
	}
	/// Flip access masks
	pub fn flip(mut self) -> Self
	{
		self.0.dstAccessMask = replace(&mut self.0.srcAccessMask, self.0.dstAccessMask);
		return self;
	}
}