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GPU: effect kernels build and match the CPU on DirectX 12 (#613) - #1571
MatejKozlovsky wants to merge 9 commits into
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Tested on AMD: Windows 11, RX 6900 XT, Adrenalin 32.0.21045.5002, FXC (no
Note for merging: the branch currently conflicts with Generated with Claude Code |
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Thanks a lot for testing on AMD! Great to see the compositor starting on the RX 6900 XT with FXC and no unavailable kernels. I'll look at the two DX12-only diffs (ccenvironment, ccbendit) and fix the conflict with main. |
Conflict: Cargo.toml [patch.crates-io] — keep main's hayro-syntax patch and this branch's vendored wgpu-hal patch in one table.
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Merged current The two DX12-only diffs @00xJS found ( Fix ( GTX 1070 (Windows 10),
@00xJS thanks a lot for the RX 6900 XT run, it made this easy to pin down. If you have time, a re-run of the DX12 + FXC suite on the RX 6900 XT would confirm the fix on AMD too. |
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Re-ran the fix on AMD: RX 6900 XT, Windows 11, Adrenalin 32.0.21045.5002, head
The 3 left are the same on both backends, with identical numbers: Generated with Claude Code |
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Tested on a second, newer machine, as of head Setup: Windows 11 Pro (build 26200), NVIDIA GeForce RTX 4070 Laptop GPU (Ada, driver 596.21 / D3D 32.0.15.9621), and an AMD Radeon 780M iGPU in the same machine. No
For comparison, the desktop app built from The one DX12 failure is So 13 pixels land one Posterize step away from the CPU (G 0.439 vs 0.325). It looks like a value sitting on a step boundary rounding differently under FXC. This test passes on Vulkan on this machine, and also on Speed: the full suite takes ~16× longer on DX12 than on Vulkan (874 s vs 55 s). I assume that's FXC compiling the kernels for each test context. It isn't a problem with the PR, but it's worth knowing for CI or for anyone running the suite on DX12. Not tested: the desktop app built from this branch, the DXC path, and the 780M iGPU. The suite picked the RTX 4070 in all runs. GitHub currently shows the PR as conflicting with 🤖 Generated with Claude Code |
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Follow-up on the Posterize failure above: it's FXC's float optimisation, the same thing your This one line in the vendored - let mut compile_flags = Fxc::D3DCOMPILE_ENABLE_STRICTNESS;
+ // EffectCraft patch (#613): IEEE strictness (/Gis), as for DXC below.
+ let mut compile_flags = Fxc::D3DCOMPILE_ENABLE_STRICTNESS | Fxc::D3DCOMPILE_IEEE_STRICTNESS;Same machine as above (RTX 4070 Laptop, Windows 11, DX12 / FXC, no DXC), on top of
So strictness doesn't stop FXC from building any kernel, and it doesn't slow the suite down. Vulkan doesn't go through this path. It might also be the reason Feel free to fold it into this PR. I'm not opening a separate PR, since it touches your vendored copy. 🤖 Generated with Claude Code |
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A correction to my FXC 🤖 Generated with Claude Code |
…ctX 12 (storytold#613) occlusion computes its three channels as one vector instead of writing a vector component through a loop index, which FXC cannot address and tried to unroll every enclosing loop for (X3550/X3511). classic3d now also builds like the effect kernels: if a compiler rejects it, 3D runs render on the CPU instead of the whole compositor failing to start. The ignored FXC diagnostic test now checks classic3d instead of the stale pointwise failure.
…told#613) FXC rejected fxw_style (X3507, every return inside a switch): the default (Twist) style now runs after the switch, same result on every backend. dx12_kernel_report lists the kernels the DX12 compiler (WGPU_DX12_COMPILER, FXC by default) rejects.
….1) (storytold#613) wgpu-hal passes DXC -Ges but not -Gis, so DXC marks every float op `fast` and reassociates: the fma-corrected divisions (fxs_qdiv, fx_noise, fx_key) fold into plain approximate ones and kernels stop matching the CPU on DirectX 12. Vendored wgpu-hal 30.0.1 adds DXC_ARG_IEEE_STRICTNESS; drop the patch once upstream does.
…atched wgpu-hal) (storytold#613) wgpu-hal's DX12 backend only issued a UAV barrier for same-state transitions from STORAGE_READ_WRITE. wgpu-core does ask for a barrier between two dispatches writing the same write-only storage texture, but DX12 dropped it, so the dispatches could overlap and the earlier write could land last. In the tests a scratch texture's NaN fill raced the kernel writing it (VR blur stereo: half the frame NaN). WARP showed wrong output too, so this is wgpu, not the NVIDIA driver. Vulkan honours the barrier.
The gpu tests set up no logger, so wgpu's warnings and the D3D12 debug layer / Vulkan validation messages were lost. env_logger (dev-dependency) is initialised in the shared GPU test lock; RUST_LOG picks the level. WGPU_VALIDATION=1 already works in release builds (CLI and tests): main's GpuContext::request applies InstanceDescriptor::with_env().
…torytold#613) Bright/Contrast (modern), Levels, Exposure and Curves wrote a vector component through a loop index (o[i] = ...). FXC cannot address that and aborted compiling the whole pointwise kernel, so every pointwise effect rendered on the CPU on DX12. The channel loops are now per-channel helpers called once per channel; same result on every backend.
fxc_point, fxc_kl_final, fxk_point, fxn_median_huang, fxt_point, fxd_point,
fxl_point, fxv_gen and fg2_segs wrote a vector component through a runtime index
(v[i] = x, fg[ix.x] -= s, lt[c] += 1). FXC cannot address that: it aborted
("compilation aborted unexpectedly"), refused the l-value (X3500), or tried to
unroll the surrounding loop and gave up (X3511: the 256-step colour program in
fxl_run, the histogram walk in the Huang median, the per-segment loop in fg2_segs).
Those writes now go through vset3f/vset4f/vset3u/vset4u, a select on the
component index, which gives the same result on every backend.
fxk_arith returned from every switch case, which FXC rejects (X3507); the default
(hard light) now runs after the switch, same result.
…torytold#613) HLSL's atan2 is approximate: FXC expands it to a short polynomial with errors near 1.2e-5 rad, and about 1.3e-4 relative near zero. CC Bend It scales the angle by the bend radius (tens of thousands of pixels for a small bend), so samples moved by up to 0.01 px; CC Environment's equirectangular lookup moved too. Both now use atan2_p (Cephes atanf, f32 precision, the CPU's signed zeros), like asin_p/acos_p.
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@ded-achtung thank you for testing this on a second machine, and for the follow-ups. Running Posterize. You're right, and I should correct my list. On my Linux software-renderer run (lavapipe), Speed. Agreed, that's FXC compiling every kernel for each test context, so it's out of scope here. #1705 (build kernels on first use) is the follow-up: applied on top of this PR, it took the RX 6900 XT's DX12 suite from 1306 s to 252 s. Conflict. I've rebased the branch onto current |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely summarizes the main changes: fixing GPU effect-kernel compilation and CPU/GPU output matching on DirectX 12. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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- Around line 215-217: Pin the wgpu dependency requirement to exactly version
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Cargo.tomlcrates/gpu/Cargo.tomlcrates/gpu/src/classic3d.rscrates/gpu/src/context.rscrates/gpu/src/shaders/classic3d.wgslcrates/gpu/src/shaders/common.wgslcrates/gpu/src/shaders/fx_color.wgslcrates/gpu/src/shaders/fx_depth.wgslcrates/gpu/src/shaders/fx_gen2.wgslcrates/gpu/src/shaders/fx_key.wgslcrates/gpu/src/shaders/fx_lut.wgslcrates/gpu/src/shaders/fx_noise.wgslcrates/gpu/src/shaders/fx_tone.wgslcrates/gpu/src/shaders/fx_transition.wgslcrates/gpu/src/shaders/fx_vr.wgslcrates/gpu/src/shaders/fx_warp.wgslcrates/gpu/src/shaders/kernels.wgslcrates/gpu/src/tests.rscrates/gpu/src/tests_3d.rscrates/gpu/src/tests_init.rsthird_party/wgpu-hal/.cargo-okthird_party/wgpu-hal/.cargo_vcs_info.jsonthird_party/wgpu-hal/Cargo.tomlthird_party/wgpu-hal/Cargo.toml.origthird_party/wgpu-hal/LICENSE.APACHEthird_party/wgpu-hal/LICENSE.MITthird_party/wgpu-hal/README.mdthird_party/wgpu-hal/build.rsthird_party/wgpu-hal/examples/halmark/main.rsthird_party/wgpu-hal/examples/halmark/shader.wgslthird_party/wgpu-hal/examples/raw-gles.em.htmlthird_party/wgpu-hal/examples/raw-gles.rsthird_party/wgpu-hal/examples/ray-traced-triangle/main.rsthird_party/wgpu-hal/examples/ray-traced-triangle/shader.wgslthird_party/wgpu-hal/src/auxil/dxgi/conv.rsthird_party/wgpu-hal/src/auxil/dxgi/exception.rsthird_party/wgpu-hal/src/auxil/dxgi/factory.rsthird_party/wgpu-hal/src/auxil/dxgi/hdr.rsthird_party/wgpu-hal/src/auxil/dxgi/mod.rsthird_party/wgpu-hal/src/auxil/dxgi/name.rsthird_party/wgpu-hal/src/auxil/dxgi/result.rsthird_party/wgpu-hal/src/auxil/dxgi/time.rsthird_party/wgpu-hal/src/auxil/mod.rsthird_party/wgpu-hal/src/auxil/renderdoc.rsthird_party/wgpu-hal/src/dx12/adapter.rsthird_party/wgpu-hal/src/dx12/command.rsthird_party/wgpu-hal/src/dx12/conv.rsthird_party/wgpu-hal/src/dx12/dcomp.rsthird_party/wgpu-hal/src/dx12/descriptor.rsthird_party/wgpu-hal/src/dx12/device.rsthird_party/wgpu-hal/src/dx12/device_creation.rsthird_party/wgpu-hal/src/dx12/instance.rsthird_party/wgpu-hal/src/dx12/mod.rsthird_party/wgpu-hal/src/dx12/pipeline_desc.rsthird_party/wgpu-hal/src/dx12/sampler.rsthird_party/wgpu-hal/src/dx12/shader_compilation.rsthird_party/wgpu-hal/src/dx12/suballocation.rsthird_party/wgpu-hal/src/dx12/types.rsthird_party/wgpu-hal/src/dx12/view.rsthird_party/wgpu-hal/src/dynamic/adapter.rsthird_party/wgpu-hal/src/dynamic/command.rsthird_party/wgpu-hal/src/dynamic/device.rsthird_party/wgpu-hal/src/dynamic/instance.rsthird_party/wgpu-hal/src/dynamic/mod.rsthird_party/wgpu-hal/src/dynamic/queue.rsthird_party/wgpu-hal/src/dynamic/surface.rsthird_party/wgpu-hal/src/gles/adapter.rsthird_party/wgpu-hal/src/gles/command.rsthird_party/wgpu-hal/src/gles/conv.rsthird_party/wgpu-hal/src/gles/device.rsthird_party/wgpu-hal/src/gles/egl.rsthird_party/wgpu-hal/src/gles/emscripten.rsthird_party/wgpu-hal/src/gles/fence.rsthird_party/wgpu-hal/src/gles/mod.rsthird_party/wgpu-hal/src/gles/queue.rsthird_party/wgpu-hal/src/gles/shaders/clear.fragthird_party/wgpu-hal/src/gles/shaders/clear.vertthird_party/wgpu-hal/src/gles/shaders/srgb_present.fragthird_party/wgpu-hal/src/gles/shaders/srgb_present.vertthird_party/wgpu-hal/src/gles/web.rsthird_party/wgpu-hal/src/gles/wgl.rsthird_party/wgpu-hal/src/lib.rsthird_party/wgpu-hal/src/metal/adapter.rsthird_party/wgpu-hal/src/metal/command.rsthird_party/wgpu-hal/src/metal/conv.rsthird_party/wgpu-hal/src/metal/device.rsthird_party/wgpu-hal/src/metal/library_from_metallib.rsthird_party/wgpu-hal/src/metal/mod.rsthird_party/wgpu-hal/src/metal/surface.rsthird_party/wgpu-hal/src/metal/time.rsthird_party/wgpu-hal/src/noop/buffer.rsthird_party/wgpu-hal/src/noop/command.rsthird_party/wgpu-hal/src/noop/mod.rsthird_party/wgpu-hal/src/validation_canary.rsthird_party/wgpu-hal/src/vulkan/adapter.rsthird_party/wgpu-hal/src/vulkan/command.rsthird_party/wgpu-hal/src/vulkan/conv.rsthird_party/wgpu-hal/src/vulkan/descriptor.rsthird_party/wgpu-hal/src/vulkan/device.rsthird_party/wgpu-hal/src/vulkan/drm.rsthird_party/wgpu-hal/src/vulkan/instance.rsthird_party/wgpu-hal/src/vulkan/mod.rsthird_party/wgpu-hal/src/vulkan/sampler.rsthird_party/wgpu-hal/src/vulkan/semaphore_list.rsthird_party/wgpu-hal/src/vulkan/swapchain/mod.rsthird_party/wgpu-hal/src/vulkan/swapchain/native.rs
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| # EffectCraft patch (#613): wgpu-hal 30.0.1 + DXC IEEE strictness (-Gis) + UAV barriers between | ||
| # write-only storage-texture writes on DX12; drop once upstream has both. | ||
| wgpu-hal = { path = "third_party/wgpu-hal" } |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
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#!/bin/bash
# Show workspace members/exclude configuration.
rg -n -A10 '^\[workspace\]' Cargo.toml
# List resolved workspace members; check whether wgpu-hal is one.
cargo metadata --no-deps --format-version 1 2>/dev/null | jq -r '.workspace_members[]' | rg -n 'wgpu-hal' || echo "wgpu-hal not a workspace member (or cargo unavailable)"
# Check the lockfile resolves wgpu-hal to the patched path version.
rg -n -A3 'name = "wgpu-hal"' Cargo.lock
# Check CI commands for --workspace / --all-targets / -D warnings.
fd -e yml -e yaml . .github 2>/dev/null | xargs -r rg -n 'cargo (test|clippy|build)'Repository: storytold/effectcraft
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nl -ba Cargo.toml | sed -n '1,18p;190,225p'
printf '%s\n' '--- Cargo.lock wgpu packages and source ---'
rg -n -A8 -B2 'name = "wgpu(-hal)?"' Cargo.lock
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Pin the patched wgpu version.
third_party/wgpu-hal is not an implicit workspace member because Cargo.toml defines an explicit members list. Do not add the proposed exclude entry.
The current wgpu requirement uses a caret range. A later incompatible upgrade can make the local wgpu-hal patch unused and restore the registry implementation. Pin wgpu to =30.0.1, or add CI coverage that fails when Cargo reports the patch as unused.
Suggested fix
-wgpu = { version = "30.0.1", features = ["fragile-send-sync-non-atomic-wasm"] }
+wgpu = { version = "=30.0.1", features = ["fragile-send-sync-non-atomic-wasm"] }🤖 Prompt for AI Agents
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Review comment at @Cargo.toml around lines 215 - 217:
Pin the wgpu dependency requirement to exactly version 30.0.1 so the local
patched wgpu-hal implementation remains active; update the existing wgpu
dependency declaration and do not add an exclude entry.
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Fair point, but pinning wgpu alone wouldn't cover it. wgpu 30.0.1 asks for wgpu-core ^30.0.0, and both ask for wgpu-hal ^30.0.0. So a wgpu-core 30.0.x that needs a newer wgpu-hal would still replace the patched copy on cargo update, with only a "patch not used" warning.
ce55184 pins wgpu-hal = "=30.0.1" instead. It's a workspace dependency of effectcraft-gpu on native targets, with no features of its own. cargo update now keeps the patched crate and holds wgpu-core back, and Cargo.lock only gains wgpu-hal in effectcraft-gpu's dependencies.
On CI coverage: effectcraft-gpu now refers to a constant that only the patched copy defines. Any build where wgpu ends up on a different wgpu-hal fails to compile, for example a 31 upgrade or a bumped pin. That covers Dependabot bumps too.
wgpu 30.0.1 asks for wgpu-core ^30.0.0, and both ask for wgpu-hal ^30.0.0. So pinning wgpu alone wouldn't keep the [patch.crates-io] copy in use: a wgpu-core 30.0.x that needs a newer wgpu-hal would replace it on `cargo update`, with only a "patch not used" warning. effectcraft-gpu now depends on wgpu-hal =30.0.1 on native targets (not used in code; Cargo.lock only gains wgpu-hal in effectcraft-gpu's dependencies), so `cargo update` keeps the patched crate and holds wgpu-core back. The patched copy also defines a marker, EFFECTCRAFT_PATCH_613, and effectcraft-gpu refers to it through wgpu::hal on native targets. Any build where wgpu ends up on another wgpu-hal (a wgpu 31 bump, a bumped pin, a dependency bot's update) fails to compile instead of silently dropping the DX12 fixes.
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Problem
On DirectX 12 the GPU path was broken in three ways:
classic3dfailed to build (X3550/X3511), so the GPU compositor did not start at all.fxw_warpfailed too (X3507). Other effect kernels fell back to the CPU per effect.-Gesbut not-Gis, so DXC marks every float opfastand reassociates. Our fma-corrected divisions (fxs_qdiv,fx_noise,fx_key) folded back into plain approximate ones, and those kernels stopped matching the CPU.STORAGE_READ_WRITE. Two dispatches writing one write-only storage texture in a row could overlap, and the earlier write could land last. In the tests, the NaN fill of a pooled scratch texture raced the kernel writing it: for example, a VR blur on a stereo frame returned NaN for one eye. WARP was wrong too, so the bug is in wgpu, not the driver.Changes
classic3d.wgsl:occlusioncomputes its three channels as onevec3instead of writingo[k]through a loop index, so FXC buildsclassic3d. Same operations, same output.context.rs:classic3dbuilds like the effect kernels. If a compiler rejects it, 3D runs render on the CPU instead of the whole compositor failing to start.fx_warp.wgsl:fxw_styleno longer returns inside everyswitchcase. The default (Twist) runs after the switch, so FXC accepts it. Same result on every backend.third_party/wgpu-hal(30.0.1), via[patch.crates-io]. Both patches are small; drop the vendored copy once upstream has them:DXC_ARG_IEEE_STRICTNESS(-Gis). Upstream: DX12: DXC is invoked without-Gis, so all float math is compiled as fast-math (unlike FXC, SPIR-V and MSL) gfx-rs/wgpu#10633transition_texturesalso emits the UAV barrier afterSTORAGE_WRITE_ONLYandSTORAGE_ATOMIC. Upstream: DX12: no UAV barrier between two writes to a write-only (or atomic) storage texture gfx-rs/wgpu#10632classic_3d_runs_render_on_the_cpu_without_the_kernel.classic3d.dx12_kernel_reportlists the kernels the DX12 compiler rejects.env_logger(dev-dependency) andGpuContext::requestappliesInstanceFlags::with_env().RUST_LOGandWGPU_VALIDATION=1then work in tests and release builds; without it, wgpu and debug-layer messages were lost. Drop the commit if you'd rather not add the dev-dependency.The vendored wgpu-hal makes the diff large (about 57k lines under
third_party/wgpu-hal). Our own changes are incrates/gpuand the rootCargo.toml. The two patches are markedEffectCraft patch (#613)in the vendored source.Testing
GPU = NVIDIA GeForce GTX 1070 (driver 32.0.15.8278), CPU = Intel Core i7-7700HQ, Windows 10.
cargo test --release -p effectcraft-gpu:On DX12 with FXC on main, the GPU did not start, so every GPU test skipped.
WGPU_VALIDATION=1: the D3D12 debug layer reports nothing in the failing runs before the barrier fix. A missing UAV barrier is a hazard, not an API error.tests_fx_vr::blur_sharpen_glow,tests_fx_lut::apply_color_lut,tests_fx_noise::minimax,tests_fx_distort::effect_points_on_a_shape_layer,tests_fx_generate::wipes) all pass after it.Not in this PR
Update: the rest of the FXC rejects
Two more commits on top, so with plain FXC (no DXC) every kernel now builds and nothing drops to the CPU on DX12.
Pointwise (
d1afa08a). Brightness & Contrast (the modern curve), Levels, Exposure and Curves looped over the channels and wroteo[i] = ...through the loop index. FXC can't address a vector component like that, so it gave up on the wholepointwisekernel, and every pointwise effect quietly rendered on the CPU. Each channel loop is now a small helper called once per channel. Same math, same output.Nine more kernels (
1d437858).fxc_point,fxc_kl_final,fxk_point,fxn_median_huang,fxt_point,fxd_point,fxl_point,fxv_genandfg2_segsall came down to the same thing: writing a vector component through a runtime index (v[i] = x,fg[ix.x] -= spill,lt[c] += 1). FXC fails on that in three different ways:fxc_point,fxk_point,fxt_point,fxd_point,fxv_gen)fxc_kl_final, the Keylight spill subtract)fxl_run(LUT/OCIO), the histogram walk in the Huang median, and the per-segment loop infg2_segsThose writes now go through
vset3f/vset4f/vset3u/vset4uincommon.wgsl, aselecton the component index, so the result is the same on every backend. Once that was fixed,fxk_pointshowed one more problem:fxk_arithreturned from everyswitchcase (X3507, same asfxw_styleearlier). Its default (hard light) now runs after the switch.Tested on a GTX 1070 / i7-7700HQ:
dx12_kernel_reportwith FXC: 0 kernels rejected (before: 9)cargo test -p effectcraft-gpu: the same two failures as on main (tests_fx_pixel2::stylize,tests_fx_stylize::posterize_thresholds_strobe_vignette), nothing newSummary by CodeRabbit
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