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
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
// Copyright (c) 2016 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::mem;
use std::ptr;
use std::sync::Arc;

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

use descriptor::descriptor::DescriptorDesc;
use descriptor::descriptor::ShaderStages;
use descriptor::descriptor_set::UnsafeDescriptorSetLayout;
use descriptor::pipeline_layout::PipelineLayoutAbstract;
use descriptor::pipeline_layout::PipelineLayoutDesc;
use descriptor::pipeline_layout::PipelineLayoutDescPcRange;
use descriptor::pipeline_layout::PipelineLayoutLimitsError;
use device::Device;
use device::DeviceOwned;

/// Wrapper around the `PipelineLayout` Vulkan object. Describes to the Vulkan implementation the
/// descriptor sets and push constants available to your shaders
pub struct PipelineLayout<L> {
    device: Arc<Device>,
    layout: vk::PipelineLayout,
    layouts: SmallVec<[Arc<UnsafeDescriptorSetLayout>; 16]>,
    desc: L,
}

impl<L> PipelineLayout<L>
    where L: PipelineLayoutDesc
{
    /// Creates a new `PipelineLayout`.
    ///
    /// # Panic
    ///
    /// - Panics if one of the layout returned by `provided_set_layout()` belongs to a different
    ///   device than the one passed as parameter.
    #[inline]
    pub fn new(device: Arc<Device>, desc: L)
               -> Result<PipelineLayout<L>, PipelineLayoutCreationError> {
        let vk = device.pointers();

        desc.check_against_limits(&device)?;

        // Building the list of `UnsafeDescriptorSetLayout` objects.
        let layouts = {
            let mut layouts: SmallVec<[_; 16]> = SmallVec::new();
            for num in 0 .. desc.num_sets() {
                layouts.push(match desc.provided_set_layout(num) {
                                 Some(l) => {
                                     assert_eq!(l.device().internal_object(),
                                                device.internal_object());
                                     l
                                 },
                                 None => {
                                     let sets_iter = 0 ..
                                         desc.num_bindings_in_set(num).unwrap_or(0);
                                     let desc_iter = sets_iter.map(|d| desc.descriptor(num, d));
                                     Arc::new(UnsafeDescriptorSetLayout::new(device.clone(),
                                                                             desc_iter)?)
                                 },
                             });
            }
            layouts
        };

        // Grab the list of `vkDescriptorSetLayout` objects from `layouts`.
        let layouts_ids = layouts
            .iter()
            .map(|l| l.internal_object())
            .collect::<SmallVec<[_; 16]>>();

        // Builds a list of `vkPushConstantRange` that describe the push constants.
        let push_constants = {
            let mut out: SmallVec<[_; 8]> = SmallVec::new();

            for pc_id in 0 .. desc.num_push_constants_ranges() {
                let PipelineLayoutDescPcRange {
                    offset,
                    size,
                    stages,
                } = {
                    match desc.push_constants_range(pc_id) {
                        Some(o) => o,
                        None => continue,
                    }
                };

                if stages == ShaderStages::none() || size == 0 || (size % 4) != 0 {
                    return Err(PipelineLayoutCreationError::InvalidPushConstant);
                }

                out.push(vk::PushConstantRange {
                             stageFlags: stages.into_vulkan_bits(),
                             offset: offset as u32,
                             size: size as u32,
                         });
            }

            out
        };

        // Each bit of `stageFlags` must only be present in a single push constants range.
        // We check that with a debug_assert because it's supposed to be enforced by the
        // `PipelineLayoutDesc`.
        debug_assert!({
                          let mut stages = 0;
                          let mut outcome = true;
                          for pc in push_constants.iter() {
                              if (stages & pc.stageFlags) != 0 {
                                  outcome = false;
                                  break;
                              }
                              stages &= pc.stageFlags;
                          }
                          outcome
                      });

        // FIXME: it is not legal to pass eg. the TESSELLATION_SHADER bit when the device doesn't
        //        have tess shaders enabled

        // Build the final object.
        let layout = unsafe {
            let infos = vk::PipelineLayoutCreateInfo {
                sType: vk::STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
                pNext: ptr::null(),
                flags: 0, // reserved
                setLayoutCount: layouts_ids.len() as u32,
                pSetLayouts: layouts_ids.as_ptr(),
                pushConstantRangeCount: push_constants.len() as u32,
                pPushConstantRanges: push_constants.as_ptr(),
            };

            let mut output = mem::uninitialized();
            check_errors(vk.CreatePipelineLayout(device.internal_object(),
                                                 &infos,
                                                 ptr::null(),
                                                 &mut output))?;
            output
        };

        Ok(PipelineLayout {
               device: device.clone(),
               layout: layout,
               layouts: layouts,
               desc: desc,
           })
    }
}

impl<L> PipelineLayout<L>
    where L: PipelineLayoutDesc
{
    /// Returns the description of the pipeline layout.
    #[inline]
    pub fn desc(&self) -> &L {
        &self.desc
    }
}

unsafe impl<D> PipelineLayoutAbstract for PipelineLayout<D>
    where D: PipelineLayoutDesc
{
    #[inline]
    fn sys(&self) -> PipelineLayoutSys {
        PipelineLayoutSys(&self.layout)
    }

    #[inline]
    fn descriptor_set_layout(&self, index: usize) -> Option<&Arc<UnsafeDescriptorSetLayout>> {
        self.layouts.get(index)
    }
}

unsafe impl<D> PipelineLayoutDesc for PipelineLayout<D>
    where D: PipelineLayoutDesc
{
    #[inline]
    fn num_sets(&self) -> usize {
        self.desc.num_sets()
    }

    #[inline]
    fn num_bindings_in_set(&self, set: usize) -> Option<usize> {
        self.desc.num_bindings_in_set(set)
    }

    #[inline]
    fn descriptor(&self, set: usize, binding: usize) -> Option<DescriptorDesc> {
        self.desc.descriptor(set, binding)
    }

    #[inline]
    fn num_push_constants_ranges(&self) -> usize {
        self.desc.num_push_constants_ranges()
    }

    #[inline]
    fn push_constants_range(&self, num: usize) -> Option<PipelineLayoutDescPcRange> {
        self.desc.push_constants_range(num)
    }
}

unsafe impl<D> DeviceOwned for PipelineLayout<D> {
    #[inline]
    fn device(&self) -> &Arc<Device> {
        &self.device
    }
}

impl<D> fmt::Debug for PipelineLayout<D>
    where D: fmt::Debug
{
    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        fmt.debug_struct("PipelineLayout")
            .field("raw", &self.layout)
            .field("device", &self.device)
            .field("desc", &self.desc)
            .finish()
    }
}

impl<L> Drop for PipelineLayout<L> {
    #[inline]
    fn drop(&mut self) {
        unsafe {
            let vk = self.device.pointers();
            vk.DestroyPipelineLayout(self.device.internal_object(), self.layout, ptr::null());
        }
    }
}

/// Opaque object that is borrowed from a `PipelineLayout`.
///
/// This object exists so that we can pass it around without having to be generic over the template
/// parameter of the `PipelineLayout`.
#[derive(Copy, Clone)]
pub struct PipelineLayoutSys<'a>(&'a vk::PipelineLayout);

unsafe impl<'a> VulkanObject for PipelineLayoutSys<'a> {
    type Object = vk::PipelineLayout;

    const TYPE: vk::DebugReportObjectTypeEXT = vk::DEBUG_REPORT_OBJECT_TYPE_PIPELINE_LAYOUT_EXT;

    #[inline]
    fn internal_object(&self) -> vk::PipelineLayout {
        *self.0
    }
}

/// Error that can happen when creating a pipeline layout.
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum PipelineLayoutCreationError {
    /// Not enough memory.
    OomError(OomError),
    /// The pipeline layout description doesn't fulfill the limit requirements.
    LimitsError(PipelineLayoutLimitsError),
    /// One of the push constants range didn't obey the rules. The list of stages must not be
    /// empty, the size must not be 0, and the size must be a multiple or 4.
    InvalidPushConstant,
}

impl error::Error for PipelineLayoutCreationError {
    #[inline]
    fn description(&self) -> &str {
        match *self {
            PipelineLayoutCreationError::OomError(_) => {
                "not enough memory available"
            },
            PipelineLayoutCreationError::LimitsError(_) => {
                "the pipeline layout description doesn't fulfill the limit requirements"
            },
            PipelineLayoutCreationError::InvalidPushConstant => {
                "one of the push constants range didn't obey the rules"
            },
        }
    }

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

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

impl From<OomError> for PipelineLayoutCreationError {
    #[inline]
    fn from(err: OomError) -> PipelineLayoutCreationError {
        PipelineLayoutCreationError::OomError(err)
    }
}

impl From<PipelineLayoutLimitsError> for PipelineLayoutCreationError {
    #[inline]
    fn from(err: PipelineLayoutLimitsError) -> PipelineLayoutCreationError {
        PipelineLayoutCreationError::LimitsError(err)
    }
}

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

/* TODO: restore
#[cfg(test)]
mod tests {
    use std::iter;
    use std::sync::Arc;
    use descriptor::descriptor::ShaderStages;
    use descriptor::descriptor_set::UnsafeDescriptorSetLayout;
    use descriptor::pipeline_layout::sys::PipelineLayout;
    use descriptor::pipeline_layout::sys::PipelineLayoutCreationError;

    #[test]
    fn empty() {
        let (device, _) = gfx_dev_and_queue!();
        let _layout = PipelineLayout::new(&device, iter::empty(), iter::empty()).unwrap();
    }

    #[test]
    fn wrong_device_panic() {
        let (device1, _) = gfx_dev_and_queue!();
        let (device2, _) = gfx_dev_and_queue!();

        let set = match UnsafeDescriptorSetLayout::raw(device1, iter::empty()) {
            Ok(s) => Arc::new(s),
            Err(_) => return
        };

        assert_should_panic!({
            let _ = PipelineLayout::new(&device2, Some(&set), iter::empty());
        });
    }

    #[test]
    fn invalid_push_constant_stages() {
        let (device, _) = gfx_dev_and_queue!();

        let push_constant = (0, 8, ShaderStages::none());

        match PipelineLayout::new(&device, iter::empty(), Some(push_constant)) {
            Err(PipelineLayoutCreationError::InvalidPushConstant) => (),
            _ => panic!()
        }
    }

    #[test]
    fn invalid_push_constant_size1() {
        let (device, _) = gfx_dev_and_queue!();

        let push_constant = (0, 0, ShaderStages::all_graphics());

        match PipelineLayout::new(&device, iter::empty(), Some(push_constant)) {
            Err(PipelineLayoutCreationError::InvalidPushConstant) => (),
            _ => panic!()
        }
    }

    #[test]
    fn invalid_push_constant_size2() {
        let (device, _) = gfx_dev_and_queue!();

        let push_constant = (0, 11, ShaderStages::all_graphics());

        match PipelineLayout::new(&device, iter::empty(), Some(push_constant)) {
            Err(PipelineLayoutCreationError::InvalidPushConstant) => (),
            _ => panic!()
        }
    }
}*/