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// 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 <gtest/gtest.h>
#include "dawn_native/Limits.h"
// Test |GetDefaultLimits| returns the default.
TEST(Limits, GetDefaultLimits) {
dawn_native::Limits limits = {};
EXPECT_NE(limits.maxBindGroups, 4u);
dawn_native::GetDefaultLimits(&limits);
EXPECT_EQ(limits.maxBindGroups, 4u);
}
// Test |ReifyDefaultLimits| populates the default if
// values are undefined.
TEST(Limits, ReifyDefaultLimits_PopulatesDefault) {
dawn_native::Limits limits;
limits.maxComputeWorkgroupStorageSize = wgpu::kLimitU32Undefined;
limits.maxStorageBufferBindingSize = wgpu::kLimitU64Undefined;
dawn_native::Limits reified = dawn_native::ReifyDefaultLimits(limits);
EXPECT_EQ(reified.maxComputeWorkgroupStorageSize, 16352u);
EXPECT_EQ(reified.maxStorageBufferBindingSize, 134217728ul);
}
// Test |ReifyDefaultLimits| clamps to the default if
// values are worse than the default.
TEST(Limits, ReifyDefaultLimits_Clamps) {
dawn_native::Limits limits;
limits.maxStorageBuffersPerShaderStage = 4;
limits.minUniformBufferOffsetAlignment = 512;
dawn_native::Limits reified = dawn_native::ReifyDefaultLimits(limits);
EXPECT_EQ(reified.maxStorageBuffersPerShaderStage, 8u);
EXPECT_EQ(reified.minUniformBufferOffsetAlignment, 256u);
}
// Test |ValidateLimits| works to validate limits are not better
// than supported.
TEST(Limits, ValidateLimits) {
// Start with the default for supported.
dawn_native::Limits defaults;
dawn_native::GetDefaultLimits(&defaults);
// Test supported == required is valid.
{
dawn_native::Limits required = defaults;
EXPECT_TRUE(ValidateLimits(defaults, required).IsSuccess());
}
// Test supported == required is valid, when they are not default.
{
dawn_native::Limits supported = defaults;
dawn_native::Limits required = defaults;
supported.maxBindGroups += 1;
required.maxBindGroups += 1;
EXPECT_TRUE(ValidateLimits(supported, required).IsSuccess());
}
// Test that default-initialized (all undefined) is valid.
{
dawn_native::Limits required = {};
EXPECT_TRUE(ValidateLimits(defaults, required).IsSuccess());
}
// Test that better than max is invalid.
{
dawn_native::Limits required = {};
required.maxTextureDimension3D = defaults.maxTextureDimension3D + 1;
dawn_native::MaybeError err = ValidateLimits(defaults, required);
EXPECT_TRUE(err.IsError());
err.AcquireError();
}
// Test that worse than max is valid.
{
dawn_native::Limits required = {};
required.maxComputeWorkgroupSizeX = defaults.maxComputeWorkgroupSizeX - 1;
EXPECT_TRUE(ValidateLimits(defaults, required).IsSuccess());
}
// Test that better than min is invalid.
{
dawn_native::Limits required = {};
required.minUniformBufferOffsetAlignment = defaults.minUniformBufferOffsetAlignment / 2;
dawn_native::MaybeError err = ValidateLimits(defaults, required);
EXPECT_TRUE(err.IsError());
err.AcquireError();
}
// Test that worse than min is valid.
{
dawn_native::Limits required = {};
required.minStorageBufferOffsetAlignment = defaults.minStorageBufferOffsetAlignment * 2;
EXPECT_TRUE(ValidateLimits(defaults, required).IsSuccess());
}
}
// Test that |ApplyLimitTiers| degrades limits to the next best tier.
TEST(Limits, ApplyLimitTiers) {
auto SetLimitsStorageBufferBindingSizeTier2 = [](dawn_native::Limits* limits) {
limits->maxStorageBufferBindingSize = 1073741824;
};
dawn_native::Limits limitsStorageBufferBindingSizeTier2;
dawn_native::GetDefaultLimits(&limitsStorageBufferBindingSizeTier2);
SetLimitsStorageBufferBindingSizeTier2(&limitsStorageBufferBindingSizeTier2);
auto SetLimitsStorageBufferBindingSizeTier3 = [](dawn_native::Limits* limits) {
limits->maxStorageBufferBindingSize = 2147483647;
};
dawn_native::Limits limitsStorageBufferBindingSizeTier3;
dawn_native::GetDefaultLimits(&limitsStorageBufferBindingSizeTier3);
SetLimitsStorageBufferBindingSizeTier3(&limitsStorageBufferBindingSizeTier3);
auto SetLimitsComputeWorkgroupStorageSizeTier1 = [](dawn_native::Limits* limits) {
limits->maxComputeWorkgroupStorageSize = 16352;
};
dawn_native::Limits limitsComputeWorkgroupStorageSizeTier1;
dawn_native::GetDefaultLimits(&limitsComputeWorkgroupStorageSizeTier1);
SetLimitsComputeWorkgroupStorageSizeTier1(&limitsComputeWorkgroupStorageSizeTier1);
auto SetLimitsComputeWorkgroupStorageSizeTier3 = [](dawn_native::Limits* limits) {
limits->maxComputeWorkgroupStorageSize = 65536;
};
dawn_native::Limits limitsComputeWorkgroupStorageSizeTier3;
dawn_native::GetDefaultLimits(&limitsComputeWorkgroupStorageSizeTier3);
SetLimitsComputeWorkgroupStorageSizeTier3(&limitsComputeWorkgroupStorageSizeTier3);
// Test that applying tiers to limits that are exactly
// equal to a tier returns the same values.
{
dawn_native::Limits limits = limitsStorageBufferBindingSizeTier2;
EXPECT_EQ(ApplyLimitTiers(limits), limits);
limits = limitsStorageBufferBindingSizeTier3;
EXPECT_EQ(ApplyLimitTiers(limits), limits);
}
// Test all limits slightly worse than tier 3.
{
dawn_native::Limits limits = limitsStorageBufferBindingSizeTier3;
limits.maxStorageBufferBindingSize -= 1;
EXPECT_EQ(ApplyLimitTiers(limits), limitsStorageBufferBindingSizeTier2);
}
// Test that limits may match one tier exactly and be degraded in another tier.
// Degrading to one tier does not affect the other tier.
{
dawn_native::Limits limits = limitsComputeWorkgroupStorageSizeTier3;
// Set tier 3 and change one limit to be insufficent.
SetLimitsStorageBufferBindingSizeTier3(&limits);
limits.maxStorageBufferBindingSize -= 1;
dawn_native::Limits tiered = ApplyLimitTiers(limits);
// Check that |tiered| has the limits of memorySize tier 2
dawn_native::Limits tieredWithMemorySizeTier2 = tiered;
SetLimitsStorageBufferBindingSizeTier2(&tieredWithMemorySizeTier2);
EXPECT_EQ(tiered, tieredWithMemorySizeTier2);
// Check that |tiered| has the limits of bindingSpace tier 3
dawn_native::Limits tieredWithBindingSpaceTier3 = tiered;
SetLimitsComputeWorkgroupStorageSizeTier3(&tieredWithBindingSpaceTier3);
EXPECT_EQ(tiered, tieredWithBindingSpaceTier3);
}
// Test that limits may be simultaneously degraded in two tiers independently.
{
dawn_native::Limits limits;
dawn_native::GetDefaultLimits(&limits);
SetLimitsComputeWorkgroupStorageSizeTier3(&limits);
SetLimitsStorageBufferBindingSizeTier3(&limits);
limits.maxComputeWorkgroupStorageSize =
limitsComputeWorkgroupStorageSizeTier1.maxComputeWorkgroupStorageSize + 1;
limits.maxStorageBufferBindingSize =
limitsStorageBufferBindingSizeTier2.maxStorageBufferBindingSize + 1;
dawn_native::Limits tiered = ApplyLimitTiers(limits);
dawn_native::Limits expected = tiered;
SetLimitsComputeWorkgroupStorageSizeTier1(&expected);
SetLimitsStorageBufferBindingSizeTier2(&expected);
EXPECT_EQ(tiered, expected);
}
}