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// Copyright 2017 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"
// Primitive topology tests work by drawing the following vertices with all the different primitive
// topology states:
// -------------------------------------
// | |
// | 1 2 5 |
// | |
// | |
// | |
// | |
// | 0 3 4 |
// | |
// -------------------------------------
//
// Points: This case looks exactly like above
//
// Lines
// -------------------------------------
// | |
// | 1 2 5 |
// | | | | |
// | | | | |
// | | | | |
// | | | | |
// | 0 3 4 |
// | |
// -------------------------------------
//
// Line Strip
// -------------------------------------
// | |
// | 1--------2 5 |
// | | | | |
// | | | | |
// | | | | |
// | | | | |
// | 0 3--------4 |
// | |
// -------------------------------------
//
// Triangle
// -------------------------------------
// | |
// | 1--------2 5 |
// | |xxxxxxx x| |
// | |xxxxx xxx| |
// | |xxx xxxxx| |
// | |x xxxxxxx| |
// | 0 3--------4 |
// | |
// -------------------------------------
//
// Triangle Strip
// -------------------------------------
// | |
// | 1--------2 5 |
// | |xxxxxxxxx x| |
// | |xxxxxxxxxxx xxx| |
// | |xxx xxxxxxxxxxx| |
// | |x xxxxxxxxxx| |
// | 0 3--------4 |
// | |
// -------------------------------------
//
// Each of these different states is a superset of some of the previous states,
// so for every state, we check any new added test locations that are not contained in previous
// states We also check that the test locations of subsequent states are untouched
constexpr static unsigned int kRTSize = 32;
struct TestLocation {
unsigned int x, y;
};
constexpr TestLocation GetMidpoint(const TestLocation& a, const TestLocation& b) noexcept {
return {(a.x + b.x) / 2, (a.y + b.y) / 2};
}
constexpr TestLocation GetCentroid(const TestLocation& a,
const TestLocation& b,
const TestLocation& c) noexcept {
return {(a.x + b.x + c.x) / 3, (a.y + b.y + c.y) / 3};
}
// clang-format off
// Offset towards one corner to avoid x or y symmetry false positives
constexpr static unsigned int kOffset = kRTSize / 8;
constexpr static TestLocation kPointTestLocations[] = {
{ kRTSize * 1 / 4 + kOffset, kRTSize * 1 / 4 + kOffset },
{ kRTSize * 1 / 4 + kOffset, kRTSize * 3 / 4 + kOffset },
{ kRTSize * 2 / 4 + kOffset, kRTSize * 3 / 4 + kOffset },
{ kRTSize * 2 / 4 + kOffset, kRTSize * 1 / 4 + kOffset },
{ kRTSize * 3 / 4 + kOffset, kRTSize * 1 / 4 + kOffset },
{ kRTSize * 3 / 4 + kOffset, kRTSize * 3 / 4 + kOffset },
};
constexpr static TestLocation kLineTestLocations[] = {
GetMidpoint(kPointTestLocations[0], kPointTestLocations[1]),
GetMidpoint(kPointTestLocations[2], kPointTestLocations[3]),
GetMidpoint(kPointTestLocations[4], kPointTestLocations[5]),
};
constexpr static TestLocation kLineStripTestLocations[] = {
GetMidpoint(kPointTestLocations[1], kPointTestLocations[2]),
GetMidpoint(kPointTestLocations[3], kPointTestLocations[4]),
};
constexpr static TestLocation kTriangleTestLocations[] = {
GetCentroid(kPointTestLocations[0], kPointTestLocations[1], kPointTestLocations[2]),
GetCentroid(kPointTestLocations[3], kPointTestLocations[4], kPointTestLocations[5]),
};
constexpr static TestLocation kTriangleStripTestLocations[] = {
GetCentroid(kPointTestLocations[1], kPointTestLocations[2], kPointTestLocations[3]),
GetCentroid(kPointTestLocations[2], kPointTestLocations[3], kPointTestLocations[4]),
};
constexpr static float kRTSizef = static_cast<float>(kRTSize);
constexpr static float kVertices[] = {
2.f * (kPointTestLocations[0].x + 0.5f) / kRTSizef - 1.f, -2.f * (kPointTestLocations[0].y + 0.5f) / kRTSizef + 1.0f, 0.f, 1.f,
2.f * (kPointTestLocations[1].x + 0.5f) / kRTSizef - 1.f, -2.f * (kPointTestLocations[1].y + 0.5f) / kRTSizef + 1.0f, 0.f, 1.f,
2.f * (kPointTestLocations[2].x + 0.5f) / kRTSizef - 1.f, -2.f * (kPointTestLocations[2].y + 0.5f) / kRTSizef + 1.0f, 0.f, 1.f,
2.f * (kPointTestLocations[3].x + 0.5f) / kRTSizef - 1.f, -2.f * (kPointTestLocations[3].y + 0.5f) / kRTSizef + 1.0f, 0.f, 1.f,
2.f * (kPointTestLocations[4].x + 0.5f) / kRTSizef - 1.f, -2.f * (kPointTestLocations[4].y + 0.5f) / kRTSizef + 1.0f, 0.f, 1.f,
2.f * (kPointTestLocations[5].x + 0.5f) / kRTSizef - 1.f, -2.f * (kPointTestLocations[5].y + 0.5f) / kRTSizef + 1.0f, 0.f, 1.f,
};
// clang-format on
class PrimitiveTopologyTest : public DawnTest {
protected:
void SetUp() override {
DawnTest::SetUp();
renderPass = utils::CreateBasicRenderPass(device, kRTSize, kRTSize);
vsModule = utils::CreateShaderModule(device, R"(
[[stage(vertex)]]
fn main([[location(0)]] pos : vec4<f32>) -> [[builtin(position)]] vec4<f32> {
return pos;
})");
fsModule = utils::CreateShaderModule(device, R"(
[[stage(fragment)]] fn main() -> [[location(0)]] vec4<f32> {
return vec4<f32>(0.0, 1.0, 0.0, 1.0);
})");
vertexBuffer = utils::CreateBufferFromData(device, kVertices, sizeof(kVertices),
wgpu::BufferUsage::Vertex);
}
struct LocationSpec {
const TestLocation* locations;
size_t count;
bool include;
};
template <std::size_t N>
constexpr LocationSpec TestPoints(TestLocation const (&points)[N], bool include) noexcept {
return {points, N, include};
}
// Draw the vertices with the given primitive topology and check the pixel values of the test
// locations
void DoTest(wgpu::PrimitiveTopology primitiveTopology,
const std::vector<LocationSpec>& locationSpecs) {
utils::ComboRenderPipelineDescriptor descriptor;
descriptor.vertex.module = vsModule;
descriptor.cFragment.module = fsModule;
descriptor.primitive.topology = primitiveTopology;
if (primitiveTopology == wgpu::PrimitiveTopology::TriangleStrip ||
primitiveTopology == wgpu::PrimitiveTopology::LineStrip) {
descriptor.primitive.stripIndexFormat = wgpu::IndexFormat::Uint32;
}
descriptor.vertex.bufferCount = 1;
descriptor.cBuffers[0].arrayStride = 4 * sizeof(float);
descriptor.cBuffers[0].attributeCount = 1;
descriptor.cAttributes[0].format = wgpu::VertexFormat::Float32x4;
descriptor.cTargets[0].format = renderPass.colorFormat;
wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&descriptor);
wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
{
wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
pass.SetPipeline(pipeline);
pass.SetVertexBuffer(0, vertexBuffer);
pass.Draw(6);
pass.EndPass();
}
wgpu::CommandBuffer commands = encoder.Finish();
queue.Submit(1, &commands);
for (auto& locationSpec : locationSpecs) {
for (size_t i = 0; i < locationSpec.count; ++i) {
// If this pixel is included, check that it is green. Otherwise, check that it is
// black
RGBA8 color = locationSpec.include ? RGBA8::kGreen : RGBA8::kZero;
EXPECT_PIXEL_RGBA8_EQ(color, renderPass.color, locationSpec.locations[i].x,
locationSpec.locations[i].y)
<< "Expected (" << locationSpec.locations[i].x << ", "
<< locationSpec.locations[i].y << ") to be " << color;
}
}
}
utils::BasicRenderPass renderPass;
wgpu::ShaderModule vsModule;
wgpu::ShaderModule fsModule;
wgpu::Buffer vertexBuffer;
};
// Test Point primitive topology
TEST_P(PrimitiveTopologyTest, PointList) {
DoTest(wgpu::PrimitiveTopology::PointList,
{
// Check that the points are drawn
TestPoints(kPointTestLocations, true),
// Check that line and triangle locations are untouched
TestPoints(kLineTestLocations, false),
TestPoints(kLineStripTestLocations, false),
TestPoints(kTriangleTestLocations, false),
TestPoints(kTriangleStripTestLocations, false),
});
}
// Test Line primitive topology
TEST_P(PrimitiveTopologyTest, LineList) {
DoTest(wgpu::PrimitiveTopology::LineList,
{
// Check that lines are drawn
TestPoints(kLineTestLocations, true),
// Check that line strip and triangle locations are untouched
TestPoints(kLineStripTestLocations, false),
TestPoints(kTriangleTestLocations, false),
TestPoints(kTriangleStripTestLocations, false),
});
}
// Test LineStrip primitive topology
TEST_P(PrimitiveTopologyTest, LineStrip) {
DoTest(wgpu::PrimitiveTopology::LineStrip, {
// Check that lines are drawn
TestPoints(kLineTestLocations, true),
TestPoints(kLineStripTestLocations, true),
// Check that triangle locations are untouched
TestPoints(kTriangleTestLocations, false),
TestPoints(kTriangleStripTestLocations, false),
});
}
// Test Triangle primitive topology
TEST_P(PrimitiveTopologyTest, TriangleList) {
DoTest(wgpu::PrimitiveTopology::TriangleList,
{
// Check that triangles are drawn
TestPoints(kTriangleTestLocations, true),
// Check that triangle strip locations are untouched
TestPoints(kTriangleStripTestLocations, false),
});
}
// Test TriangleStrip primitive topology
TEST_P(PrimitiveTopologyTest, TriangleStrip) {
DoTest(wgpu::PrimitiveTopology::TriangleStrip,
{
TestPoints(kTriangleTestLocations, true),
TestPoints(kTriangleStripTestLocations, true),
});
}
DAWN_INSTANTIATE_TEST(PrimitiveTopologyTest,
D3D12Backend(),
MetalBackend(),
OpenGLBackend(),
OpenGLESBackend(),
VulkanBackend());