//! This module defines the commands that can be recorded in the render
//! graph.
//! Commands can be allocated, and then recorded into a command
//! buffer.
//! the lifecycle of a command is thus as follows:
//! 1. A command is constructed, with its parameters and resource dependencies.
//! 2. The command is inserted into a command list. At this stage, the command's side effects are recorded and barriers are automatically inserted as required.
//! 3. When the command list is recorded into a command buffer, the command's `apply` method is called, which translates the command into actual GPU commands using the provided `CommandRecorder`.
//!
//! Each command declares its side effects, such as what resources it
//! reads from or write to, and which pipeline stages it affects. Commands are
//! recorded sequentially, in the order they were inserted into a command
//! buffer. During command insertion

use std::marker::PhantomData;

use crate::{
    device::DeviceOwned,
    render_graph::recorder::{CommandRecorder, SideEffectMap},
};

use super::resources::*;

pub struct ImportResource<T: Resource> {
    pub resource: T,
    pub range: Option<Subresource>,
    pub access: vk::AccessFlags2,
    pub stage: vk::PipelineStageFlags2,
    pub layout: Option<vk::ImageLayout>,
}

impl<T: Resource> Command for ImportResource<T> {
    fn side_effects(&self, mut map: SideEffectMap) {
        let range = self.range.unwrap_or_else(|| self.resource.full_range());
        map.with(self.stage, self.access, self.layout)
            .insert_range(self.resource.id(), range);
    }

    fn apply(self, _recorder: &mut CommandRecorder) {
        // No actual GPU commands needed for import, as it's just a logical operation
    }
}

pub trait BufferImageBufferCopyRegion {
    fn regions(&self) -> &[BufferRows];
}
impl BufferImageBufferCopyRegion for BufferRows {
    fn regions(&self) -> &[BufferRows] {
        core::slice::from_ref(self)
    }
}
impl<T: AsRef<[BufferRows]>> BufferImageBufferCopyRegion for T {
    fn regions(&self) -> &[BufferRows] {
        self.as_ref()
    }
}

pub trait ImageCopyRegion<T: IntoImageSubresourceRange> {
    fn regions(&self) -> &[TextureRegion<T>];
}
impl<T: IntoImageSubresourceRange> ImageCopyRegion<T> for TextureRegion<T> {
    fn regions(&self) -> &[TextureRegion<T>] {
        core::slice::from_ref(self)
    }
}
impl<U: IntoImageSubresourceRange, T: AsRef<[TextureRegion<U>]>> ImageCopyRegion<U> for T {
    fn regions(&self) -> &[TextureRegion<U>] {
        self.as_ref()
    }
}

pub trait BufferCopyRegion {
    fn regions(&self) -> &[BufferRange];
}
impl BufferCopyRegion for BufferRange {
    fn regions(&self) -> &[BufferRange] {
        core::slice::from_ref(self)
    }
}
impl<T: AsRef<[BufferRange]>> BufferCopyRegion for T {
    fn regions(&self) -> &[BufferRange] {
        self.as_ref()
    }
}

pub struct CopyBuffers<T: BufferCopyRegion> {
    pub src: Buffer,
    pub src_region: T,
    pub dst: Buffer,
    pub dst_region: T,
}

pub struct CopyTextures<T: ImageCopyRegion<R>, R: IntoImageSubresourceRange> {
    pub src: Texture,
    pub src_region: T,
    pub dst: Texture,
    pub dst_region: T,
    _pd: PhantomData<R>,
}

pub struct CopyBufferToTexture<
    T: BufferImageBufferCopyRegion,
    U: ImageCopyRegion<R>,
    R: IntoImageSubresourceLayers,
> {
    pub src: Buffer,
    pub src_region: T,
    pub dst: Texture,
    pub dst_region: U,
    _pd: PhantomData<R>,
}

pub struct CopyTextureToBuffer<
    T: ImageCopyRegion<R>,
    U: BufferImageBufferCopyRegion,
    R: IntoImageSubresourceLayers,
> {
    pub src: Texture,
    pub src_region: T,
    pub dst: Buffer,
    pub dst_region: U,
    _pd: PhantomData<R>,
}

impl<T, U, R> Command for CopyBufferToTexture<T, U, R>
where
    T: BufferImageBufferCopyRegion,
    U: ImageCopyRegion<R>,
    R: IntoImageSubresourceLayers,
{
    fn side_effects(&self, mut map: SideEffectMap) {
        let block_size = self.dst.format().block_size() as u64;
        let texels_per_block = self.dst.format().texels_per_block() as u64;

        let src_id = self.src.id();
        let dst_id = self.dst.id();

        for (src_region, dst_region) in self
            .src_region
            .regions()
            .iter()
            .zip(self.dst_region.regions())
        {
            let texel_count = if src_region.row_size != 0 {
                let texel_count = src_region.row_size as u64 * src_region.row_count as u64;
                debug_assert!(
                    texel_count % texels_per_block == 0,
                    "Buffer copy region must be a multiple of the block size"
                );
                texel_count
            } else {
                dst_region.extent.width as u64
                    * dst_region.extent.height as u64
                    * dst_region.extent.depth as u64
            };

            let byte_size = texel_count.div_ceil(texels_per_block) * block_size;

            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_READ,
                Some(vk::ImageLayout::TRANSFER_SRC_OPTIMAL),
            )
            .insert_range(
                src_id,
                BufferRange {
                    offset: src_region.offset,
                    size: byte_size,
                },
            );

            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_WRITE,
                Some(vk::ImageLayout::TRANSFER_DST_OPTIMAL),
            )
            .insert_range(dst_id, dst_region.range.into_range());
        }
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        let regions = self
            .src_region
            .regions()
            .iter()
            .zip(self.dst_region.regions())
            .map(|(src_region, dst_region)| {
                vk::BufferImageCopy2::default()
                    .buffer_offset(src_region.offset)
                    .buffer_row_length(src_region.row_size)
                    .buffer_image_height(src_region.row_count)
                    .image_offset(dst_region.offset)
                    .image_extent(dst_region.extent)
                    .image_subresource(dst_region.range.into_layers())
            })
            .collect::<Box<[_]>>();

        let info = vk::CopyBufferToImageInfo2::default()
            .src_buffer(recorder.get_buffer_handle(self.src.id()))
            .dst_image(recorder.get_image_handle(self.dst.id()))
            .dst_image_layout(vk::ImageLayout::TRANSFER_DST_OPTIMAL)
            .regions(&regions);

        unsafe {
            dev.cmd_copy_buffer_to_image2(cmd.raw(), &info);
        }
    }
}

impl<T, U, R> Command for CopyTextureToBuffer<T, U, R>
where
    T: ImageCopyRegion<R>,
    U: BufferImageBufferCopyRegion,
    R: IntoImageSubresourceLayers,
{
    fn side_effects(&self, mut map: SideEffectMap) {
        let block_size = self.src.format().block_size() as u64;
        let texels_per_block = self.src.format().texels_per_block() as u64;

        let src_id = self.src.id();
        let dst_id = self.dst.id();

        for (src_region, dst_region) in self
            .src_region
            .regions()
            .iter()
            .zip(self.dst_region.regions())
        {
            let texel_count = if dst_region.row_size != 0 {
                let texel_count = dst_region.row_size as u64 * dst_region.row_count as u64;
                debug_assert!(
                    texel_count % texels_per_block == 0,
                    "Buffer copy region must be a multiple of the block size"
                );
                texel_count
            } else {
                src_region.extent.width as u64
                    * src_region.extent.height as u64
                    * src_region.extent.depth as u64
            };

            let byte_size = texel_count.div_ceil(texels_per_block) * block_size;

            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_READ,
                Some(vk::ImageLayout::TRANSFER_SRC_OPTIMAL),
            )
            .insert_range(dst_id, src_region.range.into_range());

            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_WRITE,
                Some(vk::ImageLayout::TRANSFER_DST_OPTIMAL),
            )
            .insert_range(
                src_id,
                BufferRange {
                    offset: dst_region.offset,
                    size: byte_size,
                },
            );
        }
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        let regions = self
            .src_region
            .regions()
            .iter()
            .zip(self.dst_region.regions())
            .map(|(src_region, dst_region)| {
                vk::BufferImageCopy2::default()
                    .buffer_offset(dst_region.offset)
                    .buffer_row_length(dst_region.row_size)
                    .buffer_image_height(dst_region.row_count)
                    .image_offset(src_region.offset)
                    .image_extent(src_region.extent)
                    .image_subresource(src_region.range.into_layers())
            })
            .collect::<Box<[_]>>();

        let info = vk::CopyImageToBufferInfo2::default()
            .dst_buffer(recorder.get_buffer_handle(self.src.id()))
            .src_image(recorder.get_image_handle(self.dst.id()))
            .src_image_layout(vk::ImageLayout::TRANSFER_SRC_OPTIMAL)
            .regions(&regions);

        unsafe {
            dev.cmd_copy_image_to_buffer2(cmd.raw(), &info);
        }
    }
}

impl<T> Command for CopyBuffers<T>
where
    T: BufferCopyRegion,
{
    fn side_effects(&self, mut map: SideEffectMap) {
        for region in self.src_region.regions() {
            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_READ,
                None,
            )
            .insert_range(self.src.id(), *region);
        }

        for region in self.dst_region.regions() {
            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_WRITE,
                None,
            )
            .insert_range(self.dst.id(), *region);
        }
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        let regions = self
            .src_region
            .regions()
            .iter()
            .zip(self.dst_region.regions())
            .map(|(src_region, dst_region)| {
                vk::BufferCopy2::default()
                    .src_offset(src_region.offset)
                    .dst_offset(dst_region.offset)
                    .size(src_region.size)
            })
            .collect::<Box<[_]>>();

        let info = vk::CopyBufferInfo2::default()
            .dst_buffer(recorder.get_buffer_handle(self.dst.id()))
            .src_buffer(recorder.get_buffer_handle(self.src.id()))
            .regions(&regions);

        unsafe {
            dev.cmd_copy_buffer2(cmd.raw(), &info);
        }
    }
}

impl<T, R> Command for CopyTextures<T, R>
where
    T: ImageCopyRegion<R>,
    R: IntoImageSubresourceLayers,
{
    fn side_effects(&self, mut map: SideEffectMap) {
        for region in self.src_region.regions() {
            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_READ,
                None,
            )
            .insert_range(self.src.id(), region.range.into_range());
        }

        for region in self.dst_region.regions() {
            map.with(
                vk::PipelineStageFlags2::COPY,
                vk::AccessFlags2::TRANSFER_WRITE,
                None,
            )
            .insert_range(self.dst.id(), region.range.into_range());
        }
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        let regions = self
            .src_region
            .regions()
            .iter()
            .zip(self.dst_region.regions())
            .map(|(src_region, dst_region)| {
                vk::ImageCopy2::default()
                    .src_offset(src_region.offset)
                    .src_subresource(src_region.range.into_layers())
                    .dst_offset(dst_region.offset)
                    .dst_subresource(dst_region.range.into_layers())
                    .extent(src_region.extent)
            })
            .collect::<Box<[_]>>();

        let info = vk::CopyImageInfo2::default()
            .src_image(recorder.get_image_handle(self.src.id()))
            .src_image_layout(vk::ImageLayout::TRANSFER_SRC_OPTIMAL)
            .dst_image(recorder.get_image_handle(self.dst.id()))
            .dst_image_layout(vk::ImageLayout::TRANSFER_DST_OPTIMAL)
            .regions(&regions);

        unsafe {
            dev.cmd_copy_image2(cmd.raw(), &info);
        }
    }
}

pub struct ClearTexture<R: IntoImageSubresourceRange> {
    pub dst: Texture,
    pub dst_region: TextureRegion<R>,
    pub clear_value: [f32; 4],
}

impl<R: IntoImageSubresourceRange> Command for ClearTexture<R> {
    fn side_effects(&self, mut map: SideEffectMap) {
        map.with(
            vk::PipelineStageFlags2::CLEAR,
            vk::AccessFlags2::TRANSFER_WRITE,
            Some(vk::ImageLayout::TRANSFER_DST_OPTIMAL),
        )
        .insert_range(self.dst.id(), self.dst_region.range.into_range());
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        let values = vk::ClearColorValue {
            float32: self.clear_value,
        };

        unsafe {
            dev.cmd_clear_color_image(
                cmd.raw(),
                recorder.get_image_handle(self.dst.id()),
                vk::ImageLayout::TRANSFER_DST_OPTIMAL,
                &values,
                &[self.dst_region.range.into_range()],
            );
        }
    }
}

pub struct UpdateBuffer {
    pub dst: Buffer,
    pub dst_region: BufferRange,
    pub data: Vec<u8>,
}

impl Command for UpdateBuffer {
    fn side_effects(&self, mut map: SideEffectMap) {
        map.with(
            vk::PipelineStageFlags2::TRANSFER,
            vk::AccessFlags2::TRANSFER_WRITE,
            None,
        )
        .insert_range(self.dst.id(), self.dst_region);
    }

    fn apply(self, _recorder: &mut CommandRecorder) {}
}

pub struct RenderAttachment {
    pub texture: Texture,
    pub region: vk::ImageSubresourceRange,
    pub layout: vk::ImageLayout,
    pub load_op: vk::AttachmentLoadOp,
    pub store_op: vk::AttachmentStoreOp,
}

pub struct BeginRendering {
    pub color_attachments: Vec<RenderAttachment>,
    pub depth_attachment: Option<RenderAttachment>,
    pub stencil_attachment: Option<RenderAttachment>,
    pub area: (u32, u32),
    pub layers: u32,
}

impl Command for BeginRendering {
    fn side_effects(&self, mut map: SideEffectMap) {
        for attachment in &self.color_attachments {
            // The dependencies declared here need to be barrier'd before the
            // render pass: the spec says pipelineBarrier inside of a render
            // pass instance referencing framebuffer-local stages must contain
            // only framebuffer-local stages.

            map.with(
                vk::PipelineStageFlags2::COLOR_ATTACHMENT_OUTPUT,
                if attachment.load_op == vk::AttachmentLoadOp::LOAD {
                    vk::AccessFlags2::COLOR_ATTACHMENT_READ
                } else {
                    vk::AccessFlags2::empty()
                },
                Some(attachment.layout),
            )
            .insert_range(attachment.texture.id(), attachment.region);
        }
        if let Some(depth) = &self.depth_attachment {
            map.with(
                vk::PipelineStageFlags2::EARLY_FRAGMENT_TESTS,
                if depth.load_op == vk::AttachmentLoadOp::LOAD {
                    vk::AccessFlags2::DEPTH_STENCIL_ATTACHMENT_READ
                } else {
                    vk::AccessFlags2::empty()
                },
                Some(depth.layout),
            )
            .insert_range(depth.texture.id(), depth.region);
        }
        if let Some(stencil) = &self.stencil_attachment {
            map.with(
                vk::PipelineStageFlags2::EARLY_FRAGMENT_TESTS,
                if stencil.load_op == vk::AttachmentLoadOp::LOAD {
                    vk::AccessFlags2::DEPTH_STENCIL_ATTACHMENT_READ
                } else {
                    vk::AccessFlags2::empty()
                },
                Some(stencil.layout),
            )
            .insert_range(stencil.texture.id(), stencil.region);
        }
    }

    fn apply(self, _recorder: &mut CommandRecorder) {}
}

pub struct EndRendering;

impl Command for EndRendering {
    fn side_effects(&self, _map: SideEffectMap) {
        // TODO: need the beginrendering struct to declare the store-op dependencies.
    }

    fn apply(self, _recorder: &mut CommandRecorder) {}
}

pub struct BindPipeline(pub vk::Pipeline, pub vk::PipelineBindPoint);

impl Command for BindPipeline {
    fn side_effects(&self, _map: SideEffectMap) {
        // No resource access, but affects the pipeline state
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        unsafe {
            dev.cmd_bind_pipeline(cmd.raw(), self.1, self.0);
        }
    }
}

pub struct BindVertexBuffers {
    pub buffers: Vec<BufferSlice>,
    pub first_binding: u32,
}

impl Command for BindVertexBuffers {
    fn side_effects(&self, mut map: SideEffectMap) {
        for buffer in &self.buffers {
            map.with(
                vk::PipelineStageFlags2::VERTEX_ATTRIBUTE_INPUT,
                vk::AccessFlags2::VERTEX_ATTRIBUTE_READ,
                None,
            )
            .insert_range(buffer.id(), buffer.range);
        }
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        let buffers = self
            .buffers
            .iter()
            .map(|buffer| recorder.get_buffer_handle(buffer.id()))
            .collect::<Vec<_>>();

        let offsets = self
            .buffers
            .iter()
            .map(|buffer| buffer.range.offset)
            .collect::<Vec<_>>();

        unsafe {
            dev.cmd_bind_vertex_buffers(cmd.raw(), self.first_binding, &buffers, &offsets);
        }
    }
}

pub struct BindIndexBuffer(pub BufferSlice, pub IndexFormat);

impl Command for BindIndexBuffer {
    fn side_effects(&self, mut map: SideEffectMap) {
        map.with(
            vk::PipelineStageFlags2::INDEX_INPUT,
            vk::AccessFlags2::INDEX_READ,
            None,
        )
        .insert_range(self.0.id(), self.0.range);
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        let buffer = recorder.get_buffer_handle(self.0.id());
        let index_type = match self.1 {
            IndexFormat::Uint8 => vk::IndexType::UINT8_KHR,
            IndexFormat::Uint16 => vk::IndexType::UINT16,
            IndexFormat::Uint32 => vk::IndexType::UINT32,
        };

        unsafe {
            dev.cmd_bind_index_buffer(cmd.raw(), buffer, self.0.range.offset, index_type);
        }
    }
}

pub struct BindDescriptorSets {
    pub first_set: u32,
    pub pipeline_layout: vk::PipelineLayout,
    pub bind_point: vk::PipelineBindPoint,
    pub sets: Vec<vk::DescriptorSet>,
}

impl Command for BindDescriptorSets {
    fn side_effects(&self, _map: SideEffectMap) {
        // No resource access, but affects the descriptor set state
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        unsafe {
            dev.cmd_bind_descriptor_sets(
                cmd.raw(),
                self.bind_point,
                self.pipeline_layout,
                self.first_set,
                &self.sets,
                &[],
            );
        }
    }
}

pub struct SetViewport {
    pub x: f32,
    pub y: f32,
    pub width: f32,
    pub height: f32,
    pub min_depth: f32,
    pub max_depth: f32,
}

impl Command for SetViewport {
    fn side_effects(&self, _map: SideEffectMap) {
        // No resource access, but affects the viewport state
    }

    fn apply(self, _recorder: &mut CommandRecorder) {}
}

pub struct SetScissor {
    pub x: u32,
    pub y: u32,
    pub width: u32,
    pub height: u32,
}

impl Command for SetScissor {
    fn side_effects(&self, _map: SideEffectMap) {
        // No resource access, but affects the scissor state
    }

    fn apply(self, _recorder: &mut CommandRecorder) {}
}

pub struct PushConstants {
    pub pipeline_layout: vk::PipelineLayout,
    pub stage_flags: vk::ShaderStageFlags,
    pub offset: u32,
    pub data: Vec<u8>,
}

impl Command for PushConstants {
    fn side_effects(&self, _map: SideEffectMap) {
        // No resource access, but affects the push constant state
    }

    fn apply(self, recorder: &mut CommandRecorder) {
        let cmd = recorder.cmd_buffer();
        let dev = &cmd.device().raw;

        unsafe {
            dev.cmd_push_constants(
                cmd.raw(),
                self.pipeline_layout,
                self.stage_flags,
                self.offset,
                &self.data,
            );
        }
    }
}

pub struct DrawData {
    pub vertex_count: u32,
    pub instance_count: u32,
    pub first_vertex: u32,
    pub first_instance: u32,
}

pub struct DrawIndexedData {
    pub index_count: u32,
    pub instance_count: u32,
    pub first_index: u32,
    pub vertex_offset: i32,
    pub first_instance: u32,
}

pub struct DrawIndirectData {
    pub indirect_buffer: BufferSlice,
    pub count: u32,
    pub stride: u32,
}

pub struct DrawIndexedIndirectData {
    pub indirect_buffer: BufferSlice,
    pub count: u32,
    pub stride: u32,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum IndexFormat {
    Uint8,
    Uint16,
    Uint32,
}

pub struct Draw<T: IsDrawData> {
    pub data: T,
}

impl<T: IsDrawData> Command for Draw<T> {
    fn side_effects(&self, mut map: SideEffectMap) {
        self.data.side_effects(map.reborrow());
    }

    fn apply(self, _recorder: &mut CommandRecorder) {}
}

pub struct PipelineBarrier;

impl Command for PipelineBarrier {
    fn side_effects(&self, _map: SideEffectMap) {}

    fn apply(self, _recorder: &mut CommandRecorder) {
        todo!()
    }
}

pub trait Command: Sized {
    fn side_effects(&self, map: SideEffectMap);
    fn apply(self, recorder: &mut CommandRecorder);
}

mod sealed {
    pub trait IsDrawData {
        fn side_effects(&self, _map: super::SideEffectMap) {}
    }
    pub trait InsideRenderPass {}
    pub trait OutsideRenderPass {}
}
use ash::vk;
use ash_formats::FormatExt;
pub(super) use sealed::*;

impl IsDrawData for DrawData {}
impl IsDrawData for DrawIndexedData {}
impl IsDrawData for DrawIndirectData {
    fn side_effects(&self, mut map: SideEffectMap) {
        map.with(
            vk::PipelineStageFlags2::DRAW_INDIRECT,
            vk::AccessFlags2::INDIRECT_COMMAND_READ,
            None,
        )
        .insert_range(self.indirect_buffer.id(), self.indirect_buffer.range);
    }
}
impl IsDrawData for DrawIndexedIndirectData {
    fn side_effects(&self, mut map: SideEffectMap) {
        map.with(
            vk::PipelineStageFlags2::DRAW_INDIRECT,
            vk::AccessFlags2::INDIRECT_COMMAND_READ,
            None,
        )
        .insert_range(self.indirect_buffer.id(), self.indirect_buffer.range);
    }
}

impl OutsideRenderPass for BeginRendering {}
impl InsideRenderPass for EndRendering {}
impl<T: IntoImageSubresourceRange> OutsideRenderPass for ClearTexture<T> {}
impl OutsideRenderPass for UpdateBuffer {}

impl InsideRenderPass for BindPipeline {}
impl OutsideRenderPass for BindPipeline {}
impl InsideRenderPass for BindVertexBuffers {}
impl OutsideRenderPass for BindVertexBuffers {}
impl InsideRenderPass for BindIndexBuffer {}
impl OutsideRenderPass for BindIndexBuffer {}
impl InsideRenderPass for BindDescriptorSets {}
impl OutsideRenderPass for BindDescriptorSets {}
impl OutsideRenderPass for PushConstants {}

impl InsideRenderPass for SetViewport {}
impl InsideRenderPass for SetScissor {}
impl InsideRenderPass for PushConstants {}
impl<T: IsDrawData> InsideRenderPass for Draw<T> {}
impl<T: IsDrawData> InsideRenderPass for T {}