Commit Graph

157 Commits

Author SHA1 Message Date
Chip Davis
fd738e3387 MSL: Adjust FragCoord for sample-rate shading.
In Metal, the `[[position]]` input to a fragment shader remains at
fragment center, even at sample rate, like OpenGL and Direct3D. In
Vulkan, however, when the fragment shader runs at sample rate, the
`FragCoord` builtin moves to the sample position in the framebuffer,
instead of the fragment center. To account for this difference, adjust
the `FragCoord`, if present, by the sample position. The -0.5 offset is
because the fragment center is at (0.5, 0.5).

Also, add an option to force sample-rate shading in a fragment shader.
Since Metal has no explicit control for this, this is done by adding a
dummy `[[sample_id]]` which is otherwise unused, if none is already
present. This is intended to be used from e.g. MoltenVK when a
pipeline's `minSampleShading` value is nonzero.

Instead of checking if any `Input` variables have `Sample`
interpolation, I've elected to check that the `SampleRateShading`
capability is present. Since `SampleId`, `SamplePosition`, and the
`Sample` interpolation decoration require this cap, this should be
equivalent for any valid SPIR-V module. If this isn't acceptable, let me
know.
2020-11-23 10:30:24 -06:00
Jan Sikorski
f0239bce05 MSL: extract global variables from subgroup ballot operations
Fixes #1513.
2020-11-09 11:23:01 +01:00
Chip Davis
547c29f7bb MSL: Allow Bias and Grad arguments with comparison on Mac in MSL 2.3.
I kept the code to replace constant zero arguments, because `Bias` and
`Grad` still have some problems on desktop GPUs.

`Bias` works on AMD GPUs. `Grad` does not. Both work on Intel. Still
needs testing on NV. It will definitely work with Apple GPUs.
2020-10-30 11:14:59 -05:00
Chip Davis
d48d2a95c7 MSL: Allow post-depth coverage on Mac in MSL 2.3.
It's still only supported on Apple GPUs, but Macs will have those soon.
2020-10-27 22:07:01 -05:00
Chip Davis
064ed448b9 MSL: Don't remove periods from swizzle buffer index exprs. 2020-10-20 17:47:40 -05:00
Chip Davis
5845e009ea MSL: Handle Offset and Grad operands for 1D-as-2D textures. 2020-10-15 12:51:00 -05:00
Chip Davis
21d38f74ce MSL: Fix calculation of atomic image buffer address.
Fix reversed coordinates: `y` should be used to calculate the row
address. Align row address to the row stride.

I've made the row alignment a function constant; this makes it possible
to override it at pipeline compile time.

Honestly, I don't know how this worked at all for Epic. It definitely
didn't work in the CTS prior to this.
2020-10-13 20:51:56 -05:00
Chip Davis
7a5d0d6b29 MSL: Add missing interlock handling to atomic image buffers. 2020-10-13 11:44:17 -05:00
Chip Davis
4cf840ee7b MSL: Support layered input attachments.
These need to use arrayed texture types, or Metal will complain when
binding the resource. The target layer is addressed relative to the
Layer output by the vertex pipeline, or to the ViewIndex if in a
multiview pipeline. Unlike with the s/t coordinates, Vulkan does not
forbid non-zero layer coordinates here, though this cannot be expressed
in Vulkan GLSL.

Supporting 3D textures will require additional work. Part of the problem
is that Metal does not allow texture views to subset a 3D texture, so we
need some way to pass the base depth to the shader.
2020-09-02 09:18:25 -05:00
Hans-Kristian Arntzen
a07441568e Overhaul how we deal with reserved identifiers.
- Do not silently drop reserved identifiers in the parser. This makes it
  possible to reflect identifiers which are reserved by the
  cross-compiler module.
- Instead of dropping the name, emit _RESERVED_IDENTIFIER_FIXUP in the
  source to make it clear that a name has been rewritten.
- Document what is reserved and not.
2020-08-21 16:33:27 +02:00
Tomek Ponitka
18f23c47d9 Enabling setting a fixed sampleMask in Metal fragment shaders.
In Metal render pipelines don't have an option to set a sampleMask
parameter, the only way to get that functionality is to set the
sample_mask output of the fragment shader to this value directly.
We also need to take care to combine the fixed sample mask with the
one that the shader might possibly output.
2020-07-24 11:19:46 +02:00
dan sinclair
c4f3d4ae29 Roll GLSLang, SPIRV-Headers and SPIRV-Tools.
This Cl updates the various dependencies and the test file outputs.
2020-07-22 23:03:11 -04:00
dan sinclair
63fbdaca93 Roll deps.
This CL updates the GLSLang and SPIRV-Tools depedencies and updates test
files as needed.
2020-07-06 11:24:30 -04:00
Chip Davis
5281d9997e MSL: Fix up input variables' vector lengths in all stages.
Metal is picky about interface matching. If the types don't match
exactly, down to the number of vector components, Metal fails pipline
compilation. To support pipelines where the number of components
consumed by the fragment shader is less than that produced by the vertex
shader, we have to fix up the fragment shader to accept all the
components produced.
2020-06-16 14:50:30 -05:00
Chip Davis
b29f83c383 MSL: Add options to control emission of fragment outputs.
Like with `point_size` when not rendering points, Metal complains when
writing to a variable using the `[[depth]]` qualifier when no depth
buffer be attached. In that case, we must avoid emitting `FragDepth`,
just like with `PointSize`.

I assume it will also complain if there be no stencil attachment and the
shader write to `[[stencil]]`, or it write to `[[color(n)]]` but there
be no color attachment at n.
2020-04-13 15:29:11 -05:00
Hans-Kristian Arntzen
93f3265fe0 MSL: Deal with packing vectors for vertex input/fragment output. 2020-01-07 14:14:31 +01:00
Hans-Kristian Arntzen
a3fe9756d2 MSL: Support ClipDistance as an input stage variable.
MSL does not support this, so we have to emulate it by passing it around
as a varying between stages. We use a special "user(clipN)" attribute
for this rather than locN which is used for user varyings.
2019-12-02 13:19:42 +01:00
Dan Sinclair
d409210ee5 Move all .invalid shaders into no-opt folders. 2019-11-05 13:19:19 -05:00
Hans-Kristian Arntzen
1fc3347873 MSL: Fix array of array declaration.
Arrays-of-arrays were declared in wrong order.
2019-10-26 16:10:12 +02:00
Hans-Kristian Arntzen
8066d13599 MSL: Rewrite propagated depth comparison state handling.
Far cleaner, and more correct to run the traversal twice.
Fixes a case where we propagate depth state through multiple functions.
2019-10-26 16:10:11 +02:00
Hans-Kristian Arntzen
2767257adc MSL: Do not declare array of UBO/SSBO as spvUnsafeArray<T>.
There is no need for these to be copied, and cuts down on template
stamping bloat.
2019-10-26 16:10:08 +02:00
Hans-Kristian Arntzen
d1479f871a MSL: Do not generate UnsafeArray<> for any array inside buffer objects.
This avoids a lot of huge code changes.
Arrays generally cannot be copied in and out of buffers, at least no
compiler frontend seems to do it.

Also avoids a lot of issues surrounding packed vectors and matrices.
2019-10-24 12:22:30 +02:00
Hans-Kristian Arntzen
db55d474f9 MSL: Do not declare complex composite array in main for non-inlined.
Need to consider that complex composite arrays may be used in leaf
functions, and avoid the MSL library link fix unless everything is
nicely inlined.
2019-10-24 11:12:01 +02:00
Lukas Hermanns
84351d3aed Merge remote-tracking branch 'upstream/master' 2019-10-21 18:55:36 -04:00
Hans-Kristian Arntzen
4bb673a626 MSL: Add opt-in support for huge IABs.
If there are enough members in an IAB, we cannot use the constant
address space as MSL compiler complains about there being too many
members. Support emitting the device address space instead.
2019-10-14 16:20:34 +02:00
Lukas Hermanns
f3a6d28a1d Further updates for pull request #1162; also added two test cases for spvCubemapTo2DArrayFace function and added '--msl-framebuffer-fetch'/ '--msl-emulate-cube-array' compiler options. 2019-09-27 15:49:54 -04:00
Lukas Hermanns
c3d6022956 Update for pull request #1162 rev. 1 2019-09-24 18:13:04 -04:00
Lukas Hermanns
7ad0a84778 Updates for pull request #1162 2019-09-24 14:35:25 -04:00
Lukas Hermanns
37df74035b Merge branch 'ue4_dev' 2019-09-20 09:42:42 -04:00
Hans-Kristian Arntzen
3c11254ece MSL: Fix 16-bit integer literals.
There is no suffix, so bitcasts failed.
2019-09-19 10:19:51 +02:00
Lukas Hermanns
744cc3e595 Updated test shaders. 2019-09-18 14:18:22 -04:00
Lukas Hermanns
cb3ecb9e1b Updated reference Metal shaders. 2019-09-17 15:11:19 -04:00
Mark Satterthwaite
564cb3c08d Update the Metal shaders to account for changes in the shader compilation. 2019-09-11 15:06:05 -04:00
Chip Davis
2eff420d9a Support the SPV_EXT_fragment_shader_interlock extension.
This was straightforward to implement in GLSL. The
`ShadingRateInterlockOrderedEXT` and `ShadingRateInterlockUnorderedEXT`
modes aren't implemented yet, because we don't support
`SPV_NV_shading_rate` or `SPV_EXT_fragment_invocation_density` yet.

HLSL and MSL were more interesting. They don't support this directly,
but they do support marking resources as "rasterizer ordered," which
does roughly the same thing. So this implementation scans all accesses
inside the critical section and marks all storage resources found
therein as rasterizer ordered. They also don't support the fine-grained
controls on pixel- vs. sample-level interlock and disabling ordering
guarantees that GLSL and SPIR-V do, but that's OK. "Unordered" here
merely means the order is undefined; that it just so happens to be the
same as rasterizer order is immaterial. As for pixel- vs. sample-level
interlock, Vulkan explicitly states:

> With sample shading enabled, [the `PixelInterlockOrderedEXT` and
> `PixelInterlockUnorderedEXT`] execution modes are treated like
> `SampleInterlockOrderedEXT` or `SampleInterlockUnorderedEXT`
> respectively.

and:

> If [the `SampleInterlockOrderedEXT` or `SampleInterlockUnorderedEXT`]
> execution modes are used in single-sample mode they are treated like
> `PixelInterlockOrderedEXT` or `PixelInterlockUnorderedEXT`
> respectively.

So this will DTRT for MoltenVK and gfx-rs, at least.

MSL additionally supports multiple raster order groups; resources that
are not accessed together can be placed in different ROGs to allow them
to be synchronized separately. A more sophisticated analysis might be
able to place resources optimally, but that's outside the scope of this
change. For now, we assign all resources to group 0, which should do for
our purposes.

`glslang` doesn't support the `RasterizerOrdered` UAVs this
implementation produces for HLSL, so the test case needs `fxc.exe`.

It also insists on GLSL 4.50 for `GL_ARB_fragment_shader_interlock`,
even though the spec says it needs either 4.20 or
`GL_ARB_shader_image_load_store`; and it doesn't support the
`GL_NV_fragment_shader_interlock` extension at all. So I haven't been
able to test those code paths.

Fixes #1002.
2019-09-02 12:31:10 -05:00
Chip Davis
39dce88d3b MSL: Add support for sampler Y'CbCr conversion.
This change introduces functions and in one case, a class, to support
the `VK_KHR_sampler_ycbcr_conversion` extension. Except in the case of
GBGR8 and BGRG8 formats, for which Metal natively supports implicit
chroma reconstruction, we're on our own here. We have to do everything
ourselves. Much of the complexity comes from the need to support
multiple planes, which must now be passed to functions that use the
corresponding combined image-samplers. The rest is from the actual
Y'CbCr conversion itself, which requires additional post-processing of
the sample retrieved from the image.

Passing sampled images to a function was a particular problem. To
support this, I've added a new class which is emitted to MSL shaders
that pass sampled images with Y'CbCr conversions attached around. It
can handle sampled images with or without Y'CbCr conversion. This is an
awful abomination that should not exist, but I'm worried that there's
some shader out there which does this. This support requires Metal 2.0
to work properly, because it uses default-constructed texture objects,
which were only added in MSL 2. I'm not even going to get into arrays of
combined image-samplers--that's a whole other can of worms.  They are
deliberately unsupported in this change.

I've taken the liberty of refactoring the support for texture swizzling
while I'm at it. It's now treated as a post-processing step similar to
Y'CbCr conversion. I'd like to think this is cleaner than having
everything in `to_function_name()`/`to_function_args()`. It still looks
really hairy, though. I did, however, get rid of the explicit type
arguments to `spvGatherSwizzle()`/`spvGatherCompareSwizzle()`.

Update the C API. In addition to supporting this new functionality, add
some compiler options that I added in previous changes, but for which I
neglected to update the C API.
2019-09-01 18:35:53 -05:00
Thomas Roughton
91b2f34a3d Update tests to account for all non-entry-point functions being inlined 2019-08-30 09:39:06 +12:00
Hans-Kristian Arntzen
9436cd3036 MSL: Deal with array copies from and to threadgroup. 2019-08-27 13:18:01 +02:00
Hans-Kristian Arntzen
249f8e5180 MSL: Support storing to row-major column.
Defer transposes to actual Load or Store.
2019-07-22 11:13:44 +02:00
Chip Davis
343c6f4ff4 Update external repos.
Fix fallout from changes.

There's a bug in glslang that prevents `float16_t`, `[u]int16_t`, and
`[u]int8_t` constants from adding the corresponding SPIR-V capabilities.
SPIRV-Tools, meanwhile, tightened validation so that these constants are
only valid if the corresponding `Float16`, `Int16`, and `Int8` caps are
on. This affects the `16bit-constants.frag` test for GLSL and MSL.
2019-07-13 16:50:21 -05:00
Hans-Kristian Arntzen
ad5eae46ed
Merge pull request #1078 from cdavis5e/post-depth-coverage
Support the SPV_KHR_post_depth_coverage extension.
2019-07-12 09:56:26 +02:00
Chip Davis
6628ea6e48 MSL: Use the select() function for OpSelect.
This significantly improves codegen for vector `OpSelect` in MSL.
2019-07-11 10:30:37 -05:00
Chip Davis
1df47db6ba Support the SPV_KHR_post_depth_coverage extension.
Using the `PostDepthCoverage` mode specifies that the `gl_SampleMaskIn`
variable is to contain the computed coverage mask following the early
fragment tests, which this mode requires and implicitly enables.

Note that unlike Vulkan and OpenGL, Metal places this on the sample mask
input itself, and furthermore does *not* implicitly enable early
fragment testing. If it isn't enabled explicitly with an
`[[early_fragment_tests]]` attribute, the compiler will error out. So we
have to enable that mode explicitly if `PostDepthCoverage` is enabled
but `EarlyFragmentTests` isn't.

For Metal, only iOS supports this; for some reason, Apple has yet to
implement it on macOS, even though many desktop cards support it.
2019-07-11 10:28:43 -05:00
Hans-Kristian Arntzen
50342966c0 Fall back to complex loop if non-trivial continue block is found.
There is a case where we can deduce a for/while loop, but the continue
block is actually very painful to deal with, so handle that case as
well. Removes an exceptional case.
2019-07-08 11:54:29 +02:00
Hans-Kristian Arntzen
4056d0b74e Don't use scalar dot(). 2019-07-03 14:32:06 +02:00
Hans-Kristian Arntzen
041f103d44 MSL/HLSL: Support scalar reflect and refract. 2019-07-03 12:31:52 +02:00
Hans-Kristian Arntzen
ab3798fd91 MSL: Add support for SubgroupSize / SubgroupInvocationID in fragment. 2019-06-24 12:31:54 +02:00
Hans-Kristian Arntzen
e2c95bdcbc MSL: Rewrite how resource indices are fallback-assigned.
We used to use the Binding decoration for this, but this method is
hopelessly broken. If no explicit MSL resource remapping exists, we
remap automatically in a manner which should always "just work".
2019-06-21 12:54:08 +02:00
Hans-Kristian Arntzen
7fdb418f18
Merge pull request #1028 from KhronosGroup/fix-1010
MSL: Support barycentrics and PrimitiveID in fragment shaders
2019-06-19 15:29:14 +02:00
Hans-Kristian Arntzen
2e1cee5e1e MSL: Support PrimitiveID in fragment and barycentrics. 2019-06-19 09:52:35 +02:00
Hans-Kristian Arntzen
0671b3c35b MSL: Support OpImageQueryLod.
Correctness is a bit unclear at the moment. The spec document for 2.2 is
not updated for query-lod, but this is the best we can do anyways.
2019-06-19 09:51:56 +02:00