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// Copyright 2019 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 "tests/DawnTest.h"
#include "common/Assert.h"
#include "utils/ComboRenderPipelineDescriptor.h"
#include "utils/WGPUHelpers.h"
class MultisampledRenderingTest : public DawnTest {
protected:
void SetUp() override {
DawnTest::SetUp();
// TODO(crbug.com/dawn/738): Test output is wrong with D3D12 + WARP.
DAWN_SUPPRESS_TEST_IF(IsD3D12() && IsWARP());
InitTexturesForTest();
}
void InitTexturesForTest() {
mMultisampledColorTexture = CreateTextureForRenderAttachment(kColorFormat, kSampleCount);
mMultisampledColorView = mMultisampledColorTexture.CreateView();
mResolveTexture = CreateTextureForRenderAttachment(kColorFormat, 1);
mResolveView = mResolveTexture.CreateView();
mDepthStencilTexture = CreateTextureForRenderAttachment(kDepthStencilFormat, kSampleCount);
mDepthStencilView = mDepthStencilTexture.CreateView();
}
wgpu::RenderPipeline CreateRenderPipelineWithOneOutputForTest(
bool testDepth,
uint32_t sampleMask = 0xFFFFFFFF,
bool alphaToCoverageEnabled = false,
bool flipTriangle = false) {
const char* kFsOneOutputWithDepth = R"(
struct U {
color : vec4<f32>;
depth : f32;
};
[[group(0), binding(0)]] var<uniform> uBuffer : U;
struct FragmentOut {
[[location(0)]] color : vec4<f32>;
[[builtin(frag_depth)]] depth : f32;
};
[[stage(fragment)]] fn main() -> FragmentOut {
var output : FragmentOut;
output.color = uBuffer.color;
output.depth = uBuffer.depth;
return output;
})";
const char* kFsOneOutputWithoutDepth = R"(
struct U {
color : vec4<f32>;
};
[[group(0), binding(0)]] var<uniform> uBuffer : U;
[[stage(fragment)]] fn main() -> [[location(0)]] vec4<f32> {
return uBuffer.color;
})";
const char* fs = testDepth ? kFsOneOutputWithDepth : kFsOneOutputWithoutDepth;
return CreateRenderPipelineForTest(fs, 1, testDepth, sampleMask, alphaToCoverageEnabled,
flipTriangle);
}
wgpu::RenderPipeline CreateRenderPipelineWithTwoOutputsForTest(
uint32_t sampleMask = 0xFFFFFFFF,
bool alphaToCoverageEnabled = false) {
const char* kFsTwoOutputs = R"(
struct U {
color0 : vec4<f32>;
color1 : vec4<f32>;
};
[[group(0), binding(0)]] var<uniform> uBuffer : U;
struct FragmentOut {
[[location(0)]] color0 : vec4<f32>;
[[location(1)]] color1 : vec4<f32>;
};
[[stage(fragment)]] fn main() -> FragmentOut {
var output : FragmentOut;
output.color0 = uBuffer.color0;
output.color1 = uBuffer.color1;
return output;
})";
return CreateRenderPipelineForTest(kFsTwoOutputs, 2, false, sampleMask,
alphaToCoverageEnabled);
}
wgpu::Texture CreateTextureForRenderAttachment(wgpu::TextureFormat format,
uint32_t sampleCount,
uint32_t mipLevelCount = 1,
uint32_t arrayLayerCount = 1) {
wgpu::TextureDescriptor descriptor;
descriptor.dimension = wgpu::TextureDimension::e2D;
descriptor.size.width = kWidth << (mipLevelCount - 1);
descriptor.size.height = kHeight << (mipLevelCount - 1);
descriptor.size.depthOrArrayLayers = arrayLayerCount;
descriptor.sampleCount = sampleCount;
descriptor.format = format;
descriptor.mipLevelCount = mipLevelCount;
descriptor.usage = wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::CopySrc;
return device.CreateTexture(&descriptor);
}
void EncodeRenderPassForTest(wgpu::CommandEncoder commandEncoder,
const wgpu::RenderPassDescriptor& renderPass,
const wgpu::RenderPipeline& pipeline,
const float* uniformData,
uint32_t uniformDataSize) {
wgpu::Buffer uniformBuffer = utils::CreateBufferFromData(
device, uniformData, uniformDataSize, wgpu::BufferUsage::Uniform);
wgpu::BindGroup bindGroup = utils::MakeBindGroup(device, pipeline.GetBindGroupLayout(0),
{{0, uniformBuffer, 0, uniformDataSize}});
wgpu::RenderPassEncoder renderPassEncoder = commandEncoder.BeginRenderPass(&renderPass);
renderPassEncoder.SetPipeline(pipeline);
renderPassEncoder.SetBindGroup(0, bindGroup);
renderPassEncoder.Draw(3);
renderPassEncoder.EndPass();
}
void EncodeRenderPassForTest(wgpu::CommandEncoder commandEncoder,
const wgpu::RenderPassDescriptor& renderPass,
const wgpu::RenderPipeline& pipeline,
const wgpu::Color& color) {
const float uniformData[4] = {static_cast<float>(color.r), static_cast<float>(color.g),
static_cast<float>(color.b), static_cast<float>(color.a)};
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, uniformData,
sizeof(float) * 4);
}
utils::ComboRenderPassDescriptor CreateComboRenderPassDescriptorForTest(
std::initializer_list<wgpu::TextureView> colorViews,
std::initializer_list<wgpu::TextureView> resolveTargetViews,
wgpu::LoadOp colorLoadOp,
wgpu::LoadOp depthStencilLoadOp,
bool hasDepthStencilAttachment) {
ASSERT(colorViews.size() == resolveTargetViews.size());
constexpr wgpu::Color kClearColor = {0.0f, 0.0f, 0.0f, 0.0f};
constexpr float kClearDepth = 1.0f;
utils::ComboRenderPassDescriptor renderPass(colorViews);
uint32_t i = 0;
for (const wgpu::TextureView& resolveTargetView : resolveTargetViews) {
renderPass.cColorAttachments[i].loadOp = colorLoadOp;
renderPass.cColorAttachments[i].clearColor = kClearColor;
renderPass.cColorAttachments[i].resolveTarget = resolveTargetView;
++i;
}
renderPass.cDepthStencilAttachmentInfo.clearDepth = kClearDepth;
renderPass.cDepthStencilAttachmentInfo.depthLoadOp = depthStencilLoadOp;
if (hasDepthStencilAttachment) {
renderPass.cDepthStencilAttachmentInfo.view = mDepthStencilView;
renderPass.depthStencilAttachment = &renderPass.cDepthStencilAttachmentInfo;
}
return renderPass;
}
void VerifyResolveTarget(const wgpu::Color& inputColor,
wgpu::Texture resolveTexture,
uint32_t mipmapLevel = 0,
uint32_t arrayLayer = 0,
const float msaaCoverage = 0.5f) {
// In this test we only check the pixel in the middle of the texture.
constexpr uint32_t kMiddleX = (kWidth - 1) / 2;
constexpr uint32_t kMiddleY = (kHeight - 1) / 2;
RGBA8 expectedColor = ExpectedMSAAColor(inputColor, msaaCoverage);
EXPECT_TEXTURE_EQ(&expectedColor, resolveTexture, {kMiddleX, kMiddleY, arrayLayer}, {1, 1},
mipmapLevel);
}
constexpr static uint32_t kWidth = 3;
constexpr static uint32_t kHeight = 3;
constexpr static uint32_t kSampleCount = 4;
constexpr static wgpu::TextureFormat kColorFormat = wgpu::TextureFormat::RGBA8Unorm;
constexpr static wgpu::TextureFormat kDepthStencilFormat =
wgpu::TextureFormat::Depth24PlusStencil8;
constexpr static uint32_t kFirstSampleMaskBit = 0x00000001;
constexpr static uint32_t kSecondSampleMaskBit = 0x00000002;
constexpr static uint32_t kThirdSampleMaskBit = 0x00000004;
constexpr static uint32_t kFourthSampleMaskBit = 0x00000008;
wgpu::Texture mMultisampledColorTexture;
wgpu::TextureView mMultisampledColorView;
wgpu::Texture mResolveTexture;
wgpu::TextureView mResolveView;
wgpu::Texture mDepthStencilTexture;
wgpu::TextureView mDepthStencilView;
wgpu::RenderPipeline CreateRenderPipelineForTest(const char* fs,
uint32_t numColorAttachments,
bool hasDepthStencilAttachment,
uint32_t sampleMask = 0xFFFFFFFF,
bool alphaToCoverageEnabled = false,
bool flipTriangle = false) {
utils::ComboRenderPipelineDescriptor pipelineDescriptor;
// Draw a bottom-right triangle. In standard 4xMSAA pattern, for the pixels on diagonal,
// only two of the samples will be touched.
const char* vs = R"(
[[stage(vertex)]]
fn main([[builtin(vertex_index)]] VertexIndex : u32) -> [[builtin(position)]] vec4<f32> {
var pos = array<vec2<f32>, 3>(
vec2<f32>(-1.0, 1.0),
vec2<f32>( 1.0, 1.0),
vec2<f32>( 1.0, -1.0)
);
return vec4<f32>(pos[VertexIndex], 0.0, 1.0);
})";
// Draw a bottom-left triangle.
const char* vsFlipped = R"(
[[stage(vertex)]]
fn main([[builtin(vertex_index)]] VertexIndex : u32) -> [[builtin(position)]] vec4<f32> {
var pos = array<vec2<f32>, 3>(
vec2<f32>(-1.0, 1.0),
vec2<f32>( 1.0, 1.0),
vec2<f32>(-1.0, -1.0)
);
return vec4<f32>(pos[VertexIndex], 0.0, 1.0);
})";
if (flipTriangle) {
pipelineDescriptor.vertex.module = utils::CreateShaderModule(device, vsFlipped);
} else {
pipelineDescriptor.vertex.module = utils::CreateShaderModule(device, vs);
}
pipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, fs);
if (hasDepthStencilAttachment) {
wgpu::DepthStencilState* depthStencil =
pipelineDescriptor.EnableDepthStencil(kDepthStencilFormat);
depthStencil->depthWriteEnabled = true;
depthStencil->depthCompare = wgpu::CompareFunction::Less;
}
pipelineDescriptor.multisample.count = kSampleCount;
pipelineDescriptor.multisample.mask = sampleMask;
pipelineDescriptor.multisample.alphaToCoverageEnabled = alphaToCoverageEnabled;
pipelineDescriptor.cFragment.targetCount = numColorAttachments;
for (uint32_t i = 0; i < numColorAttachments; ++i) {
pipelineDescriptor.cTargets[i].format = kColorFormat;
}
wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&pipelineDescriptor);
return pipeline;
}
RGBA8 ExpectedMSAAColor(const wgpu::Color color, const double msaaCoverage) {
RGBA8 result;
result.r = static_cast<uint8_t>(std::min(255.0, 256 * color.r * msaaCoverage));
result.g = static_cast<uint8_t>(std::min(255.0, 256 * color.g * msaaCoverage));
result.b = static_cast<uint8_t>(std::min(255.0, 256 * color.b * msaaCoverage));
result.a = static_cast<uint8_t>(std::min(255.0, 256 * color.a * msaaCoverage));
return result;
}
};
// Test using one multisampled color attachment with resolve target can render correctly.
TEST_P(MultisampledRenderingTest, ResolveInto2DTexture) {
constexpr bool kTestDepth = false;
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(kTestDepth);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
// storeOp should not affect the result in the resolve target.
for (wgpu::StoreOp storeOp : {wgpu::StoreOp::Store, wgpu::StoreOp::Discard}) {
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
// Draw a green triangle.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
renderPass.cColorAttachments[0].storeOp = storeOp;
std::array<float, 4> kUniformData = {kGreen.r, kGreen.g, kGreen.b, kGreen.a};
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(),
kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, mResolveTexture);
}
}
// Test that a single-layer multisampled texture view can be created and resolved from.
TEST_P(MultisampledRenderingTest, ResolveFromSingleLayerArrayInto2DTexture) {
constexpr bool kTestDepth = false;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(kTestDepth);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
// Draw a green triangle.
{
wgpu::TextureViewDescriptor desc = {};
desc.dimension = wgpu::TextureViewDimension::e2DArray;
desc.arrayLayerCount = 1;
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorTexture.CreateView(&desc)}, {mResolveView}, wgpu::LoadOp::Clear,
wgpu::LoadOp::Clear, kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, mResolveTexture);
}
// Test multisampled rendering with depth test works correctly.
TEST_P(MultisampledRenderingTest, MultisampledRenderingWithDepthTest) {
constexpr bool kTestDepth = true;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(kTestDepth);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.8f};
// In first render pass we draw a green triangle with depth value == 0.2f.
{
utils::ComboRenderPassDescriptor renderPass =
CreateComboRenderPassDescriptorForTest({mMultisampledColorView}, {mResolveView},
wgpu::LoadOp::Clear, wgpu::LoadOp::Clear, true);
std::array<float, 5> kUniformData = {kGreen.r, kGreen.g, kGreen.b, kGreen.a, // Color
0.2f}; // depth
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(), kSize);
}
// In second render pass we draw a red triangle with depth value == 0.5f.
// This red triangle should not be displayed because it is behind the green one that is drawn in
// the last render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Load, wgpu::LoadOp::Load,
kTestDepth);
std::array<float, 5> kUniformData = {kRed.r, kRed.g, kRed.b, kRed.a, // color
0.5f}; // depth
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(), kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
// The color of the pixel in the middle of mResolveTexture should be green if MSAA resolve runs
// correctly with depth test.
VerifyResolveTarget(kGreen, mResolveTexture);
}
// Test rendering into a multisampled color attachment and doing MSAA resolve in another render pass
// works correctly.
TEST_P(MultisampledRenderingTest, ResolveInAnotherRenderPass) {
constexpr bool kTestDepth = false;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(kTestDepth);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
// In first render pass we draw a green triangle and do not set the resolve target.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {nullptr}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
// In second render pass we ony do MSAA resolve with no draw call.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Load, wgpu::LoadOp::Load,
kTestDepth);
wgpu::RenderPassEncoder renderPassEncoder = commandEncoder.BeginRenderPass(&renderPass);
renderPassEncoder.EndPass();
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, mResolveTexture);
}
// Test doing MSAA resolve into multiple resolve targets works correctly.
TEST_P(MultisampledRenderingTest, ResolveIntoMultipleResolveTargets) {
// TODO(dawn:462): Issue in the D3D12 validation layers.
DAWN_SUPPRESS_TEST_IF(IsD3D12() && IsNvidia() && IsBackendValidationEnabled());
wgpu::TextureView multisampledColorView2 =
CreateTextureForRenderAttachment(kColorFormat, kSampleCount).CreateView();
wgpu::Texture resolveTexture2 = CreateTextureForRenderAttachment(kColorFormat, 1);
wgpu::TextureView resolveView2 = resolveTexture2.CreateView();
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithTwoOutputsForTest();
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.8f};
constexpr bool kTestDepth = false;
// Draw a red triangle to the first color attachment, and a blue triangle to the second color
// attachment, and do MSAA resolve on two render targets in one render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView, multisampledColorView2}, {mResolveView, resolveView2},
wgpu::LoadOp::Clear, wgpu::LoadOp::Clear, kTestDepth);
std::array<float, 8> kUniformData = {
static_cast<float>(kRed.r), static_cast<float>(kRed.g),
static_cast<float>(kRed.b), static_cast<float>(kRed.a),
static_cast<float>(kGreen.r), static_cast<float>(kGreen.g),
static_cast<float>(kGreen.b), static_cast<float>(kGreen.a)};
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(), kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kRed, mResolveTexture);
VerifyResolveTarget(kGreen, resolveTexture2);
}
// Test doing MSAA resolve on one multisampled texture twice works correctly.
TEST_P(MultisampledRenderingTest, ResolveOneMultisampledTextureTwice) {
constexpr bool kTestDepth = false;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(kTestDepth);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
wgpu::Texture resolveTexture2 = CreateTextureForRenderAttachment(kColorFormat, 1);
// In first render pass we draw a green triangle and specify mResolveView as the resolve target.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
// In second render pass we do MSAA resolve into resolveTexture2.
{
wgpu::TextureView resolveView2 = resolveTexture2.CreateView();
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {resolveView2}, wgpu::LoadOp::Load, wgpu::LoadOp::Load,
kTestDepth);
wgpu::RenderPassEncoder renderPassEncoder = commandEncoder.BeginRenderPass(&renderPass);
renderPassEncoder.EndPass();
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, mResolveTexture);
VerifyResolveTarget(kGreen, resolveTexture2);
}
// Test using a layer of a 2D texture as resolve target works correctly.
TEST_P(MultisampledRenderingTest, ResolveIntoOneMipmapLevelOf2DTexture) {
// TODO(dawn:462): Issue in the D3D12 validation layers.
DAWN_SUPPRESS_TEST_IF(IsD3D12() && IsBackendValidationEnabled());
constexpr uint32_t kBaseMipLevel = 2;
wgpu::TextureViewDescriptor textureViewDescriptor;
textureViewDescriptor.dimension = wgpu::TextureViewDimension::e2D;
textureViewDescriptor.format = kColorFormat;
textureViewDescriptor.baseArrayLayer = 0;
textureViewDescriptor.arrayLayerCount = 1;
textureViewDescriptor.mipLevelCount = 1;
textureViewDescriptor.baseMipLevel = kBaseMipLevel;
wgpu::Texture resolveTexture =
CreateTextureForRenderAttachment(kColorFormat, 1, kBaseMipLevel + 1, 1);
wgpu::TextureView resolveView = resolveTexture.CreateView(&textureViewDescriptor);
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
constexpr bool kTestDepth = false;
// Draw a green triangle and do MSAA resolve.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {resolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, resolveTexture, kBaseMipLevel, 0);
}
// Test using a level or a layer of a 2D array texture as resolve target works correctly.
TEST_P(MultisampledRenderingTest, ResolveInto2DArrayTexture) {
// TODO(dawn:462): Issue in the D3D12 validation layers.
DAWN_SUPPRESS_TEST_IF(IsD3D12() && IsBackendValidationEnabled());
wgpu::TextureView multisampledColorView2 =
CreateTextureForRenderAttachment(kColorFormat, kSampleCount).CreateView();
wgpu::TextureViewDescriptor baseTextureViewDescriptor;
baseTextureViewDescriptor.dimension = wgpu::TextureViewDimension::e2D;
baseTextureViewDescriptor.format = kColorFormat;
baseTextureViewDescriptor.arrayLayerCount = 1;
baseTextureViewDescriptor.mipLevelCount = 1;
// Create resolveTexture1 with only 1 mipmap level.
constexpr uint32_t kBaseArrayLayer1 = 2;
constexpr uint32_t kBaseMipLevel1 = 0;
wgpu::Texture resolveTexture1 =
CreateTextureForRenderAttachment(kColorFormat, 1, kBaseMipLevel1 + 1, kBaseArrayLayer1 + 1);
wgpu::TextureViewDescriptor resolveViewDescriptor1 = baseTextureViewDescriptor;
resolveViewDescriptor1.baseArrayLayer = kBaseArrayLayer1;
resolveViewDescriptor1.baseMipLevel = kBaseMipLevel1;
wgpu::TextureView resolveView1 = resolveTexture1.CreateView(&resolveViewDescriptor1);
// Create resolveTexture2 with (kBaseMipLevel2 + 1) mipmap levels and resolve into its last
// mipmap level.
constexpr uint32_t kBaseArrayLayer2 = 5;
constexpr uint32_t kBaseMipLevel2 = 3;
wgpu::Texture resolveTexture2 =
CreateTextureForRenderAttachment(kColorFormat, 1, kBaseMipLevel2 + 1, kBaseArrayLayer2 + 1);
wgpu::TextureViewDescriptor resolveViewDescriptor2 = baseTextureViewDescriptor;
resolveViewDescriptor2.baseArrayLayer = kBaseArrayLayer2;
resolveViewDescriptor2.baseMipLevel = kBaseMipLevel2;
wgpu::TextureView resolveView2 = resolveTexture2.CreateView(&resolveViewDescriptor2);
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithTwoOutputsForTest();
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.8f};
constexpr bool kTestDepth = false;
// Draw a red triangle to the first color attachment, and a green triangle to the second color
// attachment, and do MSAA resolve on two render targets in one render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView, multisampledColorView2}, {resolveView1, resolveView2},
wgpu::LoadOp::Clear, wgpu::LoadOp::Clear, kTestDepth);
std::array<float, 8> kUniformData = {kRed.r, kRed.g, kRed.b, kRed.a, // color1
kGreen.r, kGreen.g, kGreen.b, kGreen.a}; // color2
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(), kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kRed, resolveTexture1, kBaseMipLevel1, kBaseArrayLayer1);
VerifyResolveTarget(kGreen, resolveTexture2, kBaseMipLevel2, kBaseArrayLayer2);
}
// Test using one multisampled color attachment with resolve target can render correctly
// with a non-default sample mask.
TEST_P(MultisampledRenderingTest, ResolveInto2DTextureWithSampleMask) {
constexpr bool kTestDepth = false;
// The second and third samples are included,
// only the second one is covered by the triangle.
constexpr uint32_t kSampleMask = kSecondSampleMaskBit | kThirdSampleMaskBit;
constexpr float kMSAACoverage = 0.25f;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline =
CreateRenderPipelineWithOneOutputForTest(kTestDepth, kSampleMask);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
// Draw a green triangle.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, mResolveTexture, 0, 0, kMSAACoverage);
}
// Test using one multisampled color attachment with resolve target can render correctly
// with the final sample mask empty.
TEST_P(MultisampledRenderingTest, ResolveInto2DTextureWithEmptyFinalSampleMask) {
constexpr bool kTestDepth = false;
// The third and fourth samples are included,
// none of which is covered by the triangle.
constexpr uint32_t kSampleMask = kThirdSampleMaskBit | kFourthSampleMaskBit;
constexpr float kMSAACoverage = 0.00f;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline =
CreateRenderPipelineWithOneOutputForTest(kTestDepth, kSampleMask);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
// Draw a green triangle.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, mResolveTexture, 0, 0, kMSAACoverage);
}
// Test doing MSAA resolve into multiple resolve targets works correctly with a non-default sample
// mask.
TEST_P(MultisampledRenderingTest, ResolveIntoMultipleResolveTargetsWithSampleMask) {
wgpu::TextureView multisampledColorView2 =
CreateTextureForRenderAttachment(kColorFormat, kSampleCount).CreateView();
wgpu::Texture resolveTexture2 = CreateTextureForRenderAttachment(kColorFormat, 1);
wgpu::TextureView resolveView2 = resolveTexture2.CreateView();
// The first and fourth samples are included,
// only the first one is covered by the triangle.
constexpr uint32_t kSampleMask = kFirstSampleMaskBit | kFourthSampleMaskBit;
constexpr float kMSAACoverage = 0.25f;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithTwoOutputsForTest(kSampleMask);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.8f};
constexpr bool kTestDepth = false;
// Draw a red triangle to the first color attachment, and a blue triangle to the second color
// attachment, and do MSAA resolve on two render targets in one render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView, multisampledColorView2}, {mResolveView, resolveView2},
wgpu::LoadOp::Clear, wgpu::LoadOp::Clear, kTestDepth);
std::array<float, 8> kUniformData = {kRed.r, kRed.g, kRed.b, kRed.a, // color1
kGreen.r, kGreen.g, kGreen.b, kGreen.a}; // color2
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(), kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kRed, mResolveTexture, 0, 0, kMSAACoverage);
VerifyResolveTarget(kGreen, resolveTexture2, 0, 0, kMSAACoverage);
}
// Test multisampled rendering with depth test works correctly with a non-default sample mask.
TEST_P(MultisampledRenderingTest, MultisampledRenderingWithDepthTestAndSampleMask) {
constexpr bool kTestDepth = true;
// The second sample is included in the first render pass and it's covered by the triangle.
constexpr uint32_t kSampleMaskGreen = kSecondSampleMaskBit;
// The first and second samples are included in the second render pass,
// both are covered by the triangle.
constexpr uint32_t kSampleMaskRed = kFirstSampleMaskBit | kSecondSampleMaskBit;
constexpr float kMSAACoverage = 0.50f;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipelineGreen =
CreateRenderPipelineWithOneOutputForTest(kTestDepth, kSampleMaskGreen);
wgpu::RenderPipeline pipelineRed =
CreateRenderPipelineWithOneOutputForTest(kTestDepth, kSampleMaskRed);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.8f};
// In first render pass we draw a green triangle with depth value == 0.2f.
// We will only write to the second sample.
{
utils::ComboRenderPassDescriptor renderPass =
CreateComboRenderPassDescriptorForTest({mMultisampledColorView}, {mResolveView},
wgpu::LoadOp::Clear, wgpu::LoadOp::Clear, true);
std::array<float, 5> kUniformData = {kGreen.r, kGreen.g, kGreen.b, kGreen.a, // Color
0.2f}; // depth
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipelineGreen, kUniformData.data(),
kSize);
}
// In second render pass we draw a red triangle with depth value == 0.5f.
// We will only write to the first sample, since the second one is red with a smaller depth
// value.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Load, wgpu::LoadOp::Load,
kTestDepth);
std::array<float, 5> kUniformData = {kRed.r, kRed.g, kRed.b, kRed.a, // color
0.5f}; // depth
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipelineRed, kUniformData.data(),
kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
constexpr wgpu::Color kHalfGreenHalfRed = {(kGreen.r + kRed.r) / 2.0, (kGreen.g + kRed.g) / 2.0,
(kGreen.b + kRed.b) / 2.0,
(kGreen.a + kRed.a) / 2.0};
// The color of the pixel in the middle of mResolveTexture should be half green and half
// red if MSAA resolve runs correctly with depth test.
VerifyResolveTarget(kHalfGreenHalfRed, mResolveTexture, 0, 0, kMSAACoverage);
}
// Test using one multisampled color attachment with resolve target can render correctly
// with non-default sample mask and shader-output mask.
TEST_P(MultisampledRenderingTest, ResolveInto2DTextureWithSampleMaskAndShaderOutputMask) {
// TODO(github.com/KhronosGroup/SPIRV-Cross/issues/1626): SPIRV-Cross produces bad GLSL for
// unsigned SampleMask builtins
DAWN_SUPPRESS_TEST_IF(IsOpenGL() || IsOpenGLES());
// TODO(crbug.com/dawn/673): Work around or enforce via validation that sample variables are not
// supported on some platforms.
DAWN_TEST_UNSUPPORTED_IF(HasToggleEnabled("disable_sample_variables"));
// TODO(crbug.com/dawn/571): Fails on Metal / D3D12 because SPIRV-Cross produces bad shaders
// for the SPIR-V outputted by Tint. Reenable once we use Tint's MSL / HLSL generators.
DAWN_SUPPRESS_TEST_IF(IsD3D12() || IsMetal());
constexpr bool kTestDepth = false;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
// The second and third samples are included in the shader-output mask.
// The first and third samples are included in the sample mask.
// Since we're now looking at a fully covered pixel, the rasterization mask
// includes all the samples.
// Thus the final mask includes only the third sample.
constexpr float kMSAACoverage = 0.25f;
constexpr uint32_t kSampleMask = kFirstSampleMaskBit | kThirdSampleMaskBit;
const char* fs = R"(
struct U {
color : vec4<f32>;
};
[[group(0), binding(0)]] var<uniform> uBuffer : U;
struct FragmentOut {
[[location(0)]] color : vec4<f32>;
[[builtin(sample_mask)]] sampleMask : u32;
};
[[stage(fragment)]] fn main() -> FragmentOut {
var output : FragmentOut;
output.color = uBuffer.color;
output.sampleMask = 6u;
return output;
})";
wgpu::RenderPipeline pipeline = CreateRenderPipelineForTest(fs, 1, false, kSampleMask);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
// Draw a green triangle.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
RGBA8 expectedColor = ExpectedMSAAColor(kGreen, kMSAACoverage);
EXPECT_TEXTURE_EQ(&expectedColor, mResolveTexture, {1, 0}, {1, 1});
}
// Test doing MSAA resolve into multiple resolve targets works correctly with a non-default
// shader-output mask.
TEST_P(MultisampledRenderingTest, ResolveIntoMultipleResolveTargetsWithShaderOutputMask) {
// TODO(github.com/KhronosGroup/SPIRV-Cross/issues/1626): SPIRV-Cross produces bad GLSL for
// unsigned SampleMask builtins
DAWN_SUPPRESS_TEST_IF(IsOpenGL() || IsOpenGLES());
// TODO(crbug.com/dawn/673): Work around or enforce via validation that sample variables are not
// supported on some platforms.
DAWN_TEST_UNSUPPORTED_IF(HasToggleEnabled("disable_sample_variables"));
// TODO(crbug.com/dawn/571): Fails on Metal / D3D12 because SPIRV-Cross produces bad shaders
// for the SPIR-V outputted by Tint. Reenable once we use Tint's MSL / HLSL generators.
DAWN_SUPPRESS_TEST_IF(IsD3D12() || IsMetal());
wgpu::TextureView multisampledColorView2 =
CreateTextureForRenderAttachment(kColorFormat, kSampleCount).CreateView();
wgpu::Texture resolveTexture2 = CreateTextureForRenderAttachment(kColorFormat, 1);
wgpu::TextureView resolveView2 = resolveTexture2.CreateView();
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
// The second and third samples are included in the shader-output mask,
// only the first one is covered by the triangle.
constexpr float kMSAACoverage = 0.25f;
const char* fs = R"(
struct U {
color0 : vec4<f32>;
color1 : vec4<f32>;
};
[[group(0), binding(0)]] var<uniform> uBuffer : U;
struct FragmentOut {
[[location(0)]] color0 : vec4<f32>;
[[location(1)]] color1 : vec4<f32>;
[[builtin(sample_mask)]] sampleMask : u32;
};
[[stage(fragment)]] fn main() -> FragmentOut {
var output : FragmentOut;
output.color0 = uBuffer.color0;
output.color1 = uBuffer.color1;
output.sampleMask = 6u;
return output;
})";
wgpu::RenderPipeline pipeline = CreateRenderPipelineForTest(fs, 2, false);
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.8f};
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.8f};
constexpr bool kTestDepth = false;
// Draw a red triangle to the first color attachment, and a blue triangle to the second color
// attachment, and do MSAA resolve on two render targets in one render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView, multisampledColorView2}, {mResolveView, resolveView2},
wgpu::LoadOp::Clear, wgpu::LoadOp::Clear, kTestDepth);
std::array<float, 8> kUniformData = {kRed.r, kRed.g, kRed.b, kRed.a, // color1
kGreen.r, kGreen.g, kGreen.b, kGreen.a}; // color2
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(), kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kRed, mResolveTexture, 0, 0, kMSAACoverage);
VerifyResolveTarget(kGreen, resolveTexture2, 0, 0, kMSAACoverage);
}
// Test using one multisampled color attachment with resolve target can render correctly
// with alphaToCoverageEnabled.
TEST_P(MultisampledRenderingTest, ResolveInto2DTextureWithAlphaToCoverage) {
constexpr bool kTestDepth = false;
constexpr uint32_t kSampleMask = 0xFFFFFFFF;
constexpr bool kAlphaToCoverageEnabled = true;
// Setting alpha <= 0 must result in alpha-to-coverage mask being empty.
// Setting alpha = 0.5f should result in alpha-to-coverage mask including half the samples,
// but this is not guaranteed by the spec. The Metal spec seems to guarantee that this is
// indeed the case.
// Setting alpha >= 1 must result in alpha-to-coverage mask being full.
for (float alpha : {-1.0f, 0.0f, 0.5f, 1.0f, 2.0f}) {
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(
kTestDepth, kSampleMask, kAlphaToCoverageEnabled);
const wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, alpha};
// Draw a green triangle.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
// For alpha = {0, 0.5, 1} we expect msaaCoverage to correspond to the value of alpha.
float msaaCoverage = alpha;
if (alpha < 0.0f) {
msaaCoverage = 0.0f;
}
if (alpha > 1.0f) {
msaaCoverage = 1.0f;
}
RGBA8 expectedColor = ExpectedMSAAColor(kGreen, msaaCoverage);
EXPECT_TEXTURE_EQ(&expectedColor, mResolveTexture, {1, 0}, {1, 1});
}
}
// Test doing MSAA resolve into multiple resolve targets works correctly with
// alphaToCoverage. The alphaToCoverage mask is computed based on the alpha
// component of the first color render attachment.
TEST_P(MultisampledRenderingTest, ResolveIntoMultipleResolveTargetsWithAlphaToCoverage) {
wgpu::TextureView multisampledColorView2 =
CreateTextureForRenderAttachment(kColorFormat, kSampleCount).CreateView();
wgpu::Texture resolveTexture2 = CreateTextureForRenderAttachment(kColorFormat, 1);
wgpu::TextureView resolveView2 = resolveTexture2.CreateView();
constexpr uint32_t kSampleMask = 0xFFFFFFFF;
constexpr float kMSAACoverage = 0.50f;
constexpr bool kAlphaToCoverageEnabled = true;
// The alpha-to-coverage mask should not depend on the alpha component of the
// second color render attachment.
// We test alpha = 0.51f and 0.99f instead of 0.50f and 1.00f because there are some rounding
// differences on QuadroP400 devices in that case.
for (float alpha : {0.0f, 0.51f, 0.99f}) {
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline =
CreateRenderPipelineWithTwoOutputsForTest(kSampleMask, kAlphaToCoverageEnabled);
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.51f};
const wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, alpha};
constexpr bool kTestDepth = false;
// Draw a red triangle to the first color attachment, and a blue triangle to the second
// color attachment, and do MSAA resolve on two render targets in one render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView, multisampledColorView2}, {mResolveView, resolveView2},
wgpu::LoadOp::Clear, wgpu::LoadOp::Clear, kTestDepth);
std::array<float, 8> kUniformData = {
static_cast<float>(kRed.r), static_cast<float>(kRed.g),
static_cast<float>(kRed.b), static_cast<float>(kRed.a),
static_cast<float>(kGreen.r), static_cast<float>(kGreen.g),
static_cast<float>(kGreen.b), static_cast<float>(kGreen.a)};
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kUniformData.data(),
kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
// Alpha to coverage affects both the color outputs, but the mask is computed
// using only the first one.
RGBA8 expectedRed = ExpectedMSAAColor(kRed, kMSAACoverage);
RGBA8 expectedGreen = ExpectedMSAAColor(kGreen, kMSAACoverage);
EXPECT_TEXTURE_EQ(&expectedRed, mResolveTexture, {1, 0}, {1, 1});
EXPECT_TEXTURE_EQ(&expectedGreen, resolveTexture2, {1, 0}, {1, 1});
}
}
// Test multisampled rendering with depth test works correctly with alphaToCoverage.
TEST_P(MultisampledRenderingTest, MultisampledRenderingWithDepthTestAndAlphaToCoverage) {
// This test fails because Swiftshader is off-by-one with its ((a+b)/2 + (c+d)/2)/2 fast resolve
// algorithm.
DAWN_SUPPRESS_TEST_IF(IsSwiftshader() || IsANGLE());
constexpr bool kTestDepth = true;
constexpr uint32_t kSampleMask = 0xFFFFFFFF;
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipelineGreen =
CreateRenderPipelineWithOneOutputForTest(kTestDepth, kSampleMask, true);
wgpu::RenderPipeline pipelineRed =
CreateRenderPipelineWithOneOutputForTest(kTestDepth, kSampleMask, false);
// We test alpha = 0.51f and 0.81f instead of 0.50f and 0.80f because there are some
// rounding differences on QuadroP400 devices in that case.
constexpr wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, 0.51f};
constexpr wgpu::Color kRed = {0.8f, 0.0f, 0.0f, 0.81f};
// In first render pass we draw a green triangle with depth value == 0.2f.
// We will only write to half the samples since the alphaToCoverage mode
// is enabled for that render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
std::array<float, 5> kUniformData = {kGreen.r, kGreen.g, kGreen.b, kGreen.a, // Color
0.2f}; // depth
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipelineGreen, kUniformData.data(),
kSize);
}
// In second render pass we draw a red triangle with depth value == 0.5f.
// We will write to all the samples since the alphaToCoverageMode is diabled for
// that render pass.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Load, wgpu::LoadOp::Load,
kTestDepth);
std::array<float, 5> kUniformData = {kRed.r, kRed.g, kRed.b, kRed.a, // color
0.5f}; // depth
constexpr uint32_t kSize = sizeof(kUniformData);
EncodeRenderPassForTest(commandEncoder, renderPass, pipelineRed, kUniformData.data(),
kSize);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
constexpr wgpu::Color kHalfGreenHalfRed = {(kGreen.r + kRed.r) / 2.0, (kGreen.g + kRed.g) / 2.0,
(kGreen.b + kRed.b) / 2.0,
(kGreen.a + kRed.a) / 2.0};
RGBA8 expectedColor = ExpectedMSAAColor(kHalfGreenHalfRed, 1.0f);
EXPECT_TEXTURE_EQ(&expectedColor, mResolveTexture, {1, 0}, {1, 1});
}
// Test using one multisampled color attachment with resolve target can render correctly
// with alphaToCoverageEnabled and a sample mask.
TEST_P(MultisampledRenderingTest, ResolveInto2DTextureWithAlphaToCoverageAndSampleMask) {
// This test fails because Swiftshader is off-by-one with its ((a+b)/2 + (c+d)/2)/2 fast resolve
// algorithm.
DAWN_SUPPRESS_TEST_IF(IsSwiftshader() || IsANGLE());
// TODO(dawn:491): This doesn't work on Metal, because we're using both the shader-output
// mask (emulting the sampleMask from RenderPipeline) and alpha-to-coverage at the same
// time. See the issue: https://github.com/gpuweb/gpuweb/issues/959.
DAWN_SUPPRESS_TEST_IF(IsMetal());
constexpr bool kTestDepth = false;
constexpr float kMSAACoverage = 0.50f;
constexpr uint32_t kSampleMask = kFirstSampleMaskBit | kThirdSampleMaskBit;
constexpr bool kAlphaToCoverageEnabled = true;
// For those values of alpha we expect the proportion of samples to be covered
// to correspond to the value of alpha.
// We're assuming in the case of alpha = 0.50f that the implementation
// dependendent algorithm will choose exactly one of the first and third samples.
for (float alpha : {0.0f, 0.50f, 1.00f}) {
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(
kTestDepth, kSampleMask, kAlphaToCoverageEnabled);
const wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, alpha - 0.01f};
// Draw a green triangle.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
RGBA8 expectedColor = ExpectedMSAAColor(kGreen, kMSAACoverage * alpha);
EXPECT_TEXTURE_EQ(&expectedColor, mResolveTexture, {1, 0}, {1, 1});
}
}
// Test using one multisampled color attachment with resolve target can render correctly
// with alphaToCoverageEnabled and a rasterization mask.
TEST_P(MultisampledRenderingTest, ResolveInto2DTextureWithAlphaToCoverageAndRasterizationMask) {
// This test fails because Swiftshader is off-by-one with its ((a+b)/2 + (c+d)/2)/2 fast resolve
// algorithm.
DAWN_SUPPRESS_TEST_IF(IsSwiftshader() || IsANGLE());
constexpr bool kTestDepth = false;
constexpr float kMSAACoverage = 0.50f;
constexpr uint32_t kSampleMask = 0xFFFFFFFF;
constexpr bool kAlphaToCoverageEnabled = true;
constexpr bool kFlipTriangle = true;
// For those values of alpha we expect the proportion of samples to be covered
// to correspond to the value of alpha.
// We're assuming in the case of alpha = 0.50f that the implementation
// dependendent algorithm will choose exactly one of the samples covered by the
// triangle.
for (float alpha : {0.0f, 0.50f, 1.00f}) {
wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder();
wgpu::RenderPipeline pipeline = CreateRenderPipelineWithOneOutputForTest(
kTestDepth, kSampleMask, kAlphaToCoverageEnabled, kFlipTriangle);
const wgpu::Color kGreen = {0.0f, 0.8f, 0.0f, alpha - 0.01f};
// Draw a green triangle.
{
utils::ComboRenderPassDescriptor renderPass = CreateComboRenderPassDescriptorForTest(
{mMultisampledColorView}, {mResolveView}, wgpu::LoadOp::Clear, wgpu::LoadOp::Clear,
kTestDepth);
EncodeRenderPassForTest(commandEncoder, renderPass, pipeline, kGreen);
}
wgpu::CommandBuffer commandBuffer = commandEncoder.Finish();
queue.Submit(1, &commandBuffer);
VerifyResolveTarget(kGreen, mResolveTexture, 0, 0, kMSAACoverage * alpha);
}
}
DAWN_INSTANTIATE_TEST(MultisampledRenderingTest,
D3D12Backend(),
D3D12Backend({}, {"use_d3d12_resource_heap_tier2"}),
D3D12Backend({}, {"use_d3d12_render_pass"}),
MetalBackend(),
OpenGLBackend(),
OpenGLESBackend(),
VulkanBackend(),
MetalBackend({"emulate_store_and_msaa_resolve"}),
MetalBackend({"always_resolve_into_zero_level_and_layer"}),
MetalBackend({"always_resolve_into_zero_level_and_layer",
"emulate_store_and_msaa_resolve"}));