1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
// Copyright (c) 2017 The vulkano developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.

use smallvec::SmallVec;
use std::error;
use std::fmt;
use std::marker::PhantomData;
use std::ptr;

use device::DeviceOwned;
use device::Queue;
use swapchain::PresentRegion;
use swapchain::Swapchain;
use sync::Semaphore;

use Error;
use OomError;
use SynchronizedVulkanObject;
use VulkanObject;
use check_errors;
use vk;

/// Prototype for a submission that presents a swapchain on the screen.
// TODO: example here
pub struct SubmitPresentBuilder<'a> {
    wait_semaphores: SmallVec<[vk::Semaphore; 8]>,
    swapchains: SmallVec<[vk::SwapchainKHR; 4]>,
    image_indices: SmallVec<[u32; 4]>,
    present_regions: SmallVec<[vk::PresentRegionKHR; 4]>,
    rect_layers: SmallVec<[vk::RectLayerKHR; 4]>,
    marker: PhantomData<&'a ()>,
}

impl<'a> SubmitPresentBuilder<'a> {
    /// Builds a new empty `SubmitPresentBuilder`.
    #[inline]
    pub fn new() -> SubmitPresentBuilder<'a> {
        SubmitPresentBuilder {
            wait_semaphores: SmallVec::new(),
            swapchains: SmallVec::new(),
            image_indices: SmallVec::new(),
            present_regions: SmallVec::new(),
            rect_layers: SmallVec::new(),
            marker: PhantomData,
        }
    }

    /// Adds a semaphore to be waited upon before the presents are executed.
    ///
    /// # Safety
    ///
    /// - If you submit this builder, the semaphore must be kept alive until you are guaranteed
    ///   that the GPU has presented the swapchains.
    ///
    /// - If you submit this builder, no other queue must be waiting on these semaphores. In other
    ///   words, each semaphore signal can only correspond to one semaphore wait.
    ///
    /// - If you submit this builder, the semaphores must be signaled when the queue execution
    ///   reaches this submission, or there must be one or more submissions in queues that are
    ///   going to signal these semaphores. In other words, you must not block the queue with
    ///   semaphores that can't get signaled.
    ///
    /// - The swapchains and semaphores must all belong to the same device.
    ///
    #[inline]
    pub unsafe fn add_wait_semaphore(&mut self, semaphore: &'a Semaphore) {
        self.wait_semaphores.push(semaphore.internal_object());
    }

    /// Adds an image of a swapchain to be presented.
    ///
    /// Allows to specify a present region.
    /// Areas outside the present region *can* be ignored by the Vulkan implementation for
    /// optimizations purposes.
    ///
    /// If `VK_KHR_incremental_present` is not enabled, the `present_region` parameter is ignored.
    ///
    /// # Safety
    ///
    /// - If you submit this builder, the swapchain must be kept alive until you are
    ///   guaranteed that the GPU has finished presenting.
    ///
    /// - The swapchains and semaphores must all belong to the same device.
    ///
    #[inline]
    pub unsafe fn add_swapchain<W>(&mut self, swapchain: &'a Swapchain<W>, image_num: u32,
                                   present_region: Option<&'a PresentRegion>) {
        debug_assert!(image_num < swapchain.num_images());

        if swapchain
            .device()
            .loaded_extensions()
            .khr_incremental_present
        {
            let vk_present_region = match present_region {
                Some(present_region) => {
                    assert!(present_region.is_compatible_with(swapchain));
                    for rectangle in &present_region.rectangles {
                        self.rect_layers.push(rectangle.to_vk());
                    }
                    vk::PresentRegionKHR {
                        rectangleCount: present_region.rectangles.len() as u32,
                        // Set this to null for now; in submit fill it with self.rect_layers
                        pRectangles: ptr::null(),
                    }
                },
                None => {
                    vk::PresentRegionKHR {
                        rectangleCount: 0,
                        pRectangles: ptr::null(),
                    }
                },
            };
            self.present_regions.push(vk_present_region);
        }

        self.swapchains.push(swapchain.internal_object());
        self.image_indices.push(image_num);
    }


    /// Submits the command. Calls `vkQueuePresentKHR`.
    ///
    /// # Panic
    ///
    /// Panics if no swapchain image has been added to the builder.
    ///
    pub fn submit(mut self, queue: &Queue) -> Result<(), SubmitPresentError> {
        unsafe {
            debug_assert_eq!(self.swapchains.len(), self.image_indices.len());
            assert!(!self.swapchains.is_empty(),
                    "Tried to submit a present command without any swapchain");

            let present_regions = {
                if !self.present_regions.is_empty() {
                    debug_assert!(queue.device().loaded_extensions().khr_incremental_present);
                    debug_assert_eq!(self.swapchains.len(), self.present_regions.len());
                    let mut current_index = 0;
                    for present_region in &mut self.present_regions {
                        present_region.pRectangles = self.rect_layers[current_index ..].as_ptr();
                        current_index += present_region.rectangleCount as usize;
                    }
                    Some(vk::PresentRegionsKHR {
                             sType: vk::STRUCTURE_TYPE_PRESENT_REGIONS_KHR,
                             pNext: ptr::null(),
                             swapchainCount: self.present_regions.len() as u32,
                             pRegions: self.present_regions.as_ptr(),
                         })
                } else {
                    None
                }
            };

            let mut results = vec![vk::SUCCESS; self.swapchains.len()];

            let vk = queue.device().pointers();
            let queue = queue.internal_object_guard();

            let infos = vk::PresentInfoKHR {
                sType: vk::STRUCTURE_TYPE_PRESENT_INFO_KHR,
                pNext: present_regions
                    .as_ref()
                    .map(|pr| pr as *const vk::PresentRegionsKHR as *const _)
                    .unwrap_or(ptr::null()),
                waitSemaphoreCount: self.wait_semaphores.len() as u32,
                pWaitSemaphores: self.wait_semaphores.as_ptr(),
                swapchainCount: self.swapchains.len() as u32,
                pSwapchains: self.swapchains.as_ptr(),
                pImageIndices: self.image_indices.as_ptr(),
                pResults: results.as_mut_ptr(),
            };

            check_errors(vk.QueuePresentKHR(*queue, &infos))?;

            for result in results {
                check_errors(result)?;
            }

            Ok(())
        }
    }
}

impl<'a> fmt::Debug for SubmitPresentBuilder<'a> {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        fmt.debug_struct("SubmitPresentBuilder")
            .field("wait_semaphores", &self.wait_semaphores)
            .field("swapchains", &self.swapchains)
            .field("image_indices", &self.image_indices)
            .finish()
    }
}

/// Error that can happen when submitting the present prototype.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
#[repr(u32)]
pub enum SubmitPresentError {
    /// Not enough memory.
    OomError(OomError),

    /// The connection to the device has been lost.
    DeviceLost,

    /// The surface is no longer accessible and must be recreated.
    SurfaceLost,

    /// The surface has changed in a way that makes the swapchain unusable. You must query the
    /// surface's new properties and recreate a new swapchain if you want to continue drawing.
    OutOfDate,
}

impl error::Error for SubmitPresentError {
    #[inline]
    fn description(&self) -> &str {
        match *self {
            SubmitPresentError::OomError(_) => "not enough memory",
            SubmitPresentError::DeviceLost => "the connection to the device has been lost",
            SubmitPresentError::SurfaceLost => "the surface of this swapchain is no longer valid",
            SubmitPresentError::OutOfDate => "the swapchain needs to be recreated",
        }
    }

    #[inline]
    fn cause(&self) -> Option<&dyn error::Error> {
        match *self {
            SubmitPresentError::OomError(ref err) => Some(err),
            _ => None,
        }
    }
}

impl fmt::Display for SubmitPresentError {
    #[inline]
    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        write!(fmt, "{}", error::Error::description(self))
    }
}

impl From<Error> for SubmitPresentError {
    #[inline]
    fn from(err: Error) -> SubmitPresentError {
        match err {
            err @ Error::OutOfHostMemory => SubmitPresentError::OomError(OomError::from(err)),
            err @ Error::OutOfDeviceMemory => SubmitPresentError::OomError(OomError::from(err)),
            Error::DeviceLost => SubmitPresentError::DeviceLost,
            Error::SurfaceLost => SubmitPresentError::SurfaceLost,
            Error::OutOfDate => SubmitPresentError::OutOfDate,
            _ => panic!("unexpected error: {:?}", err),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn no_swapchain_added() {
        let (_, queue) = gfx_dev_and_queue!();
        assert_should_panic!("Tried to submit a present command without any swapchain", {
            let _ = SubmitPresentBuilder::new().submit(&queue);
        });
    }
}