| // Copyright 2021 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "dawn/native/Limits.h" |
| |
| #include <algorithm> |
| #include <array> |
| |
| #include "dawn/common/Assert.h" |
| #include "dawn/common/Constants.h" |
| #include "dawn/common/Math.h" |
| |
| // clang-format off |
| // TODO(crbug.com/dawn/685): |
| // For now, only expose these tiers until metrics can determine better ones. |
| #define LIMITS_WORKGROUP_STORAGE_SIZE(X) \ |
| X(Maximum, maxComputeWorkgroupStorageSize, 16384, 32768, 49152, 65536) |
| |
| // Tiers for limits related to workgroup size. |
| // TODO(crbug.com/dawn/685): Define these better. For now, use two tiers where one |
| // is available on nearly all desktop platforms. |
| #define LIMITS_WORKGROUP_SIZE(X) \ |
| X(Maximum, maxComputeInvocationsPerWorkgroup, 256, 1024) \ |
| X(Maximum, maxComputeWorkgroupSizeX, 256, 1024) \ |
| X(Maximum, maxComputeWorkgroupSizeY, 256, 1024) \ |
| X(Maximum, maxComputeWorkgroupSizeZ, 64, 64) \ |
| X(Maximum, maxComputeWorkgroupsPerDimension, 65535, 65535) |
| |
| // Tiers are 128MB, 1GB, 2GB-4, 4GB-4. |
| #define LIMITS_STORAGE_BUFFER_BINDING_SIZE(X) \ |
| X(Maximum, maxStorageBufferBindingSize, 134217728, 1073741824, 2147483644, 4294967292) |
| |
| // Tiers are 256MB, 1GB, 2GB, 4GB. |
| #define LIMITS_MAX_BUFFER_SIZE(X) \ |
| X(Maximum, maxBufferSize, 0x10000000, 0x40000000, 0x80000000, 0x100000000) |
| |
| // Tiers for limits related to resource bindings. |
| // TODO(crbug.com/dawn/685): Define these better. For now, use two tiers where one |
| // offers slightly better than default limits. |
| #define LIMITS_RESOURCE_BINDINGS(X) \ |
| X(Maximum, maxDynamicUniformBuffersPerPipelineLayout, 8, 10) \ |
| X(Maximum, maxDynamicStorageBuffersPerPipelineLayout, 4, 8) \ |
| X(Maximum, maxSampledTexturesPerShaderStage, 16, 16) \ |
| X(Maximum, maxSamplersPerShaderStage, 16, 16) \ |
| X(Maximum, maxStorageBuffersPerShaderStage, 8, 8) \ |
| X(Maximum, maxStorageTexturesPerShaderStage, 4, 8) \ |
| X(Maximum, maxUniformBuffersPerShaderStage, 12, 12) |
| |
| // TODO(crbug.com/dawn/685): |
| // These limits don't have tiers yet. Define two tiers with the same values since the macros |
| // in this file expect more than one tier. |
| #define LIMITS_OTHER(X) \ |
| X(Maximum, maxTextureDimension1D, 8192, 8192) \ |
| X(Maximum, maxTextureDimension2D, 8192, 8192) \ |
| X(Maximum, maxTextureDimension3D, 2048, 2048) \ |
| X(Maximum, maxTextureArrayLayers, 256, 256) \ |
| X(Maximum, maxBindGroups, 4, 4) \ |
| X(Maximum, maxBindingsPerBindGroup, 1000, 1000) \ |
| X(Maximum, maxUniformBufferBindingSize, 65536, 65536) \ |
| X(Alignment, minUniformBufferOffsetAlignment, 256, 256) \ |
| X(Alignment, minStorageBufferOffsetAlignment, 256, 256) \ |
| X(Maximum, maxVertexBuffers, 8, 8) \ |
| X(Maximum, maxVertexAttributes, 16, 16) \ |
| X(Maximum, maxVertexBufferArrayStride, 2048, 2048) \ |
| X(Maximum, maxInterStageShaderComponents, 60, 60) \ |
| X(Maximum, maxInterStageShaderVariables, 16, 16) \ |
| X(Maximum, maxColorAttachments, 8, 8) \ |
| X(Maximum, maxColorAttachmentBytesPerSample, 32, 32) |
| // clang-format on |
| |
| #define LIMITS_EACH_GROUP(X) \ |
| X(LIMITS_WORKGROUP_STORAGE_SIZE) \ |
| X(LIMITS_WORKGROUP_SIZE) \ |
| X(LIMITS_STORAGE_BUFFER_BINDING_SIZE) \ |
| X(LIMITS_MAX_BUFFER_SIZE) \ |
| X(LIMITS_RESOURCE_BINDINGS) \ |
| X(LIMITS_OTHER) |
| |
| #define LIMITS(X) \ |
| LIMITS_WORKGROUP_STORAGE_SIZE(X) \ |
| LIMITS_WORKGROUP_SIZE(X) \ |
| LIMITS_STORAGE_BUFFER_BINDING_SIZE(X) \ |
| LIMITS_MAX_BUFFER_SIZE(X) \ |
| LIMITS_RESOURCE_BINDINGS(X) \ |
| LIMITS_OTHER(X) |
| |
| namespace dawn::native { |
| namespace { |
| template <uint32_t A, uint32_t B> |
| constexpr void StaticAssertSame() { |
| static_assert(A == B, "Mismatching tier count in limit group."); |
| } |
| |
| template <uint32_t I, uint32_t... Is> |
| constexpr uint32_t ReduceSameValue(std::integer_sequence<uint32_t, I, Is...>) { |
| int unused[] = {0, (StaticAssertSame<I, Is>(), 0)...}; |
| DAWN_UNUSED(unused); |
| return I; |
| } |
| |
| enum class LimitClass { |
| Alignment, |
| Maximum, |
| }; |
| |
| template <LimitClass C> |
| struct CheckLimit; |
| |
| template <> |
| struct CheckLimit<LimitClass::Alignment> { |
| template <typename T> |
| static bool IsBetter(T lhs, T rhs) { |
| return lhs < rhs; |
| } |
| |
| template <typename T> |
| static MaybeError Validate(T supported, T required) { |
| DAWN_INVALID_IF(IsBetter(required, supported), |
| "Required limit (%u) is lower than the supported limit (%u).", required, |
| supported); |
| DAWN_INVALID_IF(!IsPowerOfTwo(required), "Required limit (%u) is not a power of two.", |
| required); |
| return {}; |
| } |
| }; |
| |
| template <> |
| struct CheckLimit<LimitClass::Maximum> { |
| template <typename T> |
| static bool IsBetter(T lhs, T rhs) { |
| return lhs > rhs; |
| } |
| |
| template <typename T> |
| static MaybeError Validate(T supported, T required) { |
| DAWN_INVALID_IF(IsBetter(required, supported), |
| "Required limit (%u) is greater than the supported limit (%u).", required, |
| supported); |
| return {}; |
| } |
| }; |
| |
| template <typename T> |
| bool IsLimitUndefined(T value) { |
| static_assert(sizeof(T) != sizeof(T), "IsLimitUndefined not implemented for this type"); |
| return false; |
| } |
| |
| template <> |
| bool IsLimitUndefined<uint32_t>(uint32_t value) { |
| return value == wgpu::kLimitU32Undefined; |
| } |
| |
| template <> |
| bool IsLimitUndefined<uint64_t>(uint64_t value) { |
| return value == wgpu::kLimitU64Undefined; |
| } |
| |
| } // namespace |
| |
| void GetDefaultLimits(Limits* limits) { |
| ASSERT(limits != nullptr); |
| #define X(Better, limitName, base, ...) limits->limitName = base; |
| LIMITS(X) |
| #undef X |
| } |
| |
| Limits ReifyDefaultLimits(const Limits& limits) { |
| Limits out; |
| #define X(Class, limitName, base, ...) \ |
| if (IsLimitUndefined(limits.limitName) || \ |
| CheckLimit<LimitClass::Class>::IsBetter(static_cast<decltype(limits.limitName)>(base), \ |
| limits.limitName)) { \ |
| /* If the limit is undefined or the default is better, use the default */ \ |
| out.limitName = base; \ |
| } else { \ |
| out.limitName = limits.limitName; \ |
| } |
| LIMITS(X) |
| #undef X |
| return out; |
| } |
| |
| MaybeError ValidateLimits(const Limits& supportedLimits, const Limits& requiredLimits) { |
| #define X(Class, limitName, ...) \ |
| if (!IsLimitUndefined(requiredLimits.limitName)) { \ |
| DAWN_TRY_CONTEXT(CheckLimit<LimitClass::Class>::Validate(supportedLimits.limitName, \ |
| requiredLimits.limitName), \ |
| "validating " #limitName); \ |
| } |
| LIMITS(X) |
| #undef X |
| return {}; |
| } |
| |
| Limits ApplyLimitTiers(Limits limits) { |
| #define X_TIER_COUNT(Better, limitName, ...) , std::integer_sequence<uint64_t, __VA_ARGS__>{}.size() |
| #define GET_TIER_COUNT(LIMIT_GROUP) \ |
| ReduceSameValue(std::integer_sequence<uint32_t LIMIT_GROUP(X_TIER_COUNT)>{}) |
| |
| #define X_EACH_GROUP(LIMIT_GROUP) \ |
| { \ |
| constexpr uint32_t kTierCount = GET_TIER_COUNT(LIMIT_GROUP); \ |
| for (uint32_t i = kTierCount; i != 0; --i) { \ |
| LIMIT_GROUP(X_CHECK_BETTER_AND_CLAMP) \ |
| /* Limits fit in tier and have been clamped. Break. */ \ |
| break; \ |
| } \ |
| } |
| |
| #define X_CHECK_BETTER_AND_CLAMP(Class, limitName, ...) \ |
| { \ |
| constexpr std::array<decltype(Limits::limitName), kTierCount> tiers{__VA_ARGS__}; \ |
| decltype(Limits::limitName) tierValue = tiers[i - 1]; \ |
| if (CheckLimit<LimitClass::Class>::IsBetter(tierValue, limits.limitName)) { \ |
| /* The tier is better. Go to the next tier. */ \ |
| continue; \ |
| } else if (tierValue != limits.limitName) { \ |
| /* Better than the tier. Degrade |limits| to the tier. */ \ |
| limits.limitName = tiers[i - 1]; \ |
| } \ |
| } |
| |
| LIMITS_EACH_GROUP(X_EACH_GROUP) |
| |
| // After tiering all limit values, enforce additional restriction by calling NormalizeLimits. |
| // Since maxStorageBufferBindingSize and maxBufferSize tiers are not exactly aligned, it is |
| // possible that tiered maxStorageBufferBindingSize is larger than tiered maxBufferSize. For |
| // example, on a hypothetical device with both maxStorageBufferBindingSize and maxBufferSize |
| // being 4GB-1, the tiered maxStorageBufferBindingSize would be 4GB-4 while the tiered |
| // maxBufferSize being 2GB. NormalizeLimits will clamp the maxStorageBufferBindingSize to |
| // maxBufferSize in such cases, although the result may or may not be one of predefined |
| // maxStorageBufferBindingSize tiers. |
| NormalizeLimits(&limits); |
| |
| #undef X_CHECK_BETTER_AND_CLAMP |
| #undef X_EACH_GROUP |
| #undef GET_TIER_COUNT |
| #undef X_TIER_COUNT |
| return limits; |
| } |
| |
| #define DAWN_INTERNAL_LIMITS_MEMBER_ASSIGNMENT(type, name) \ |
| { result.name = limits.name; } |
| #define DAWN_INTERNAL_LIMITS_FOREACH_MEMBER_ASSIGNMENT(MEMBERS) \ |
| MEMBERS(DAWN_INTERNAL_LIMITS_MEMBER_ASSIGNMENT) |
| LimitsForCompilationRequest LimitsForCompilationRequest::Create(const Limits& limits) { |
| LimitsForCompilationRequest result; |
| DAWN_INTERNAL_LIMITS_FOREACH_MEMBER_ASSIGNMENT(LIMITS_FOR_COMPILATION_REQUEST_MEMBERS) |
| return result; |
| } |
| #undef DAWN_INTERNAL_LIMITS_FOREACH_MEMBER_ASSIGNMENT |
| #undef DAWN_INTERNAL_LIMITS_MEMBER_ASSIGNMENT |
| |
| template <> |
| void stream::Stream<LimitsForCompilationRequest>::Write(Sink* s, |
| const LimitsForCompilationRequest& t) { |
| t.VisitAll([&](const auto&... members) { StreamIn(s, members...); }); |
| } |
| |
| void NormalizeLimits(Limits* limits) { |
| // Enforce internal Dawn constants for some limits to ensure they don't go over fixed-size |
| // arrays in Dawn's internal code. |
| limits->maxVertexBufferArrayStride = |
| std::min(limits->maxVertexBufferArrayStride, kMaxVertexBufferArrayStride); |
| limits->maxColorAttachments = |
| std::min(limits->maxColorAttachments, uint32_t(kMaxColorAttachments)); |
| limits->maxBindGroups = std::min(limits->maxBindGroups, kMaxBindGroups); |
| limits->maxVertexAttributes = |
| std::min(limits->maxVertexAttributes, uint32_t(kMaxVertexAttributes)); |
| limits->maxVertexBuffers = std::min(limits->maxVertexBuffers, uint32_t(kMaxVertexBuffers)); |
| limits->maxInterStageShaderComponents = |
| std::min(limits->maxInterStageShaderComponents, kMaxInterStageShaderComponents); |
| limits->maxSampledTexturesPerShaderStage = |
| std::min(limits->maxSampledTexturesPerShaderStage, kMaxSampledTexturesPerShaderStage); |
| limits->maxSamplersPerShaderStage = |
| std::min(limits->maxSamplersPerShaderStage, kMaxSamplersPerShaderStage); |
| limits->maxStorageBuffersPerShaderStage = |
| std::min(limits->maxStorageBuffersPerShaderStage, kMaxStorageBuffersPerShaderStage); |
| limits->maxStorageTexturesPerShaderStage = |
| std::min(limits->maxStorageTexturesPerShaderStage, kMaxStorageTexturesPerShaderStage); |
| limits->maxUniformBuffersPerShaderStage = |
| std::min(limits->maxUniformBuffersPerShaderStage, kMaxUniformBuffersPerShaderStage); |
| |
| // Additional enforcement for dependent limits. |
| limits->maxStorageBufferBindingSize = |
| std::min(limits->maxStorageBufferBindingSize, limits->maxBufferSize); |
| limits->maxUniformBufferBindingSize = |
| std::min(limits->maxUniformBufferBindingSize, limits->maxBufferSize); |
| } |
| |
| } // namespace dawn::native |
