| // 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 "utils/ComboRenderPipelineDescriptor.h" |
| #include "utils/WGPUHelpers.h" |
| |
| class CullingTest : public DawnTest { |
| protected: |
| wgpu::RenderPipeline CreatePipelineForTest(wgpu::FrontFace frontFace, wgpu::CullMode cullMode) { |
| utils::ComboRenderPipelineDescriptor pipelineDescriptor; |
| |
| // Draw two triangles with different winding orders: |
| // 1. The top-left one is counterclockwise (CCW) |
| // 2. The bottom-right one is clockwise (CW) |
| pipelineDescriptor.vertex.module = utils::CreateShaderModule(device, R"( |
| let pos : array<vec2<f32>, 6> = array<vec2<f32>, 6>( |
| vec2<f32>(-1.0, 1.0), |
| vec2<f32>(-1.0, 0.0), |
| vec2<f32>( 0.0, 1.0), |
| vec2<f32>( 0.0, -1.0), |
| vec2<f32>( 1.0, 0.0), |
| vec2<f32>( 1.0, -1.0)); |
| |
| [[stage(vertex)]] |
| fn main([[builtin(vertex_index)]] VertexIndex : u32) -> [[builtin(position)]] vec4<f32> { |
| return vec4<f32>(pos[VertexIndex], 0.0, 1.0); |
| })"); |
| |
| // FragCoord of pixel(x, y) in framebuffer coordinate is (x + 0.5, y + 0.5). And we use |
| // RGBA8 format for the back buffer. So (FragCoord.xy - vec2(0.5)) / 255 in shader code |
| // will make the pixel's R and G channels exactly equal to the pixel's x and y coordinates. |
| pipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, R"( |
| [[stage(fragment)]] |
| fn main([[builtin(position)]] FragCoord : vec4<f32>) -> [[location(0)]] vec4<f32> { |
| return vec4<f32>( |
| (FragCoord.xy - vec2<f32>(0.5, 0.5)) / vec2<f32>(255.0, 255.0), |
| 0.0, 1.0); |
| })"); |
| |
| // Set culling mode and front face according to the parameters |
| pipelineDescriptor.primitive.frontFace = frontFace; |
| pipelineDescriptor.primitive.cullMode = cullMode; |
| |
| return device.CreateRenderPipeline(&pipelineDescriptor); |
| } |
| |
| wgpu::Texture Create2DTextureForTest(wgpu::TextureFormat format) { |
| wgpu::TextureDescriptor textureDescriptor; |
| textureDescriptor.dimension = wgpu::TextureDimension::e2D; |
| textureDescriptor.format = format; |
| textureDescriptor.usage = |
| wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::CopySrc; |
| textureDescriptor.mipLevelCount = 1; |
| textureDescriptor.sampleCount = 1; |
| textureDescriptor.size = {kSize, kSize, 1}; |
| return device.CreateTexture(&textureDescriptor); |
| } |
| |
| void DoTest(wgpu::FrontFace frontFace, |
| wgpu::CullMode cullMode, |
| bool isCCWTriangleCulled, |
| bool isCWTriangleCulled) { |
| wgpu::Texture colorTexture = Create2DTextureForTest(wgpu::TextureFormat::RGBA8Unorm); |
| |
| utils::ComboRenderPassDescriptor renderPassDescriptor({colorTexture.CreateView()}); |
| renderPassDescriptor.cColorAttachments[0].clearColor = {0.0, 0.0, 1.0, 1.0}; |
| renderPassDescriptor.cColorAttachments[0].loadOp = wgpu::LoadOp::Clear; |
| |
| wgpu::CommandEncoder commandEncoder = device.CreateCommandEncoder(); |
| wgpu::RenderPassEncoder renderPass = commandEncoder.BeginRenderPass(&renderPassDescriptor); |
| renderPass.SetPipeline(CreatePipelineForTest(frontFace, cullMode)); |
| renderPass.Draw(6); |
| renderPass.EndPass(); |
| wgpu::CommandBuffer commandBuffer = commandEncoder.Finish(); |
| queue.Submit(1, &commandBuffer); |
| |
| const RGBA8 kBackgroundColor = RGBA8::kBlue; |
| const RGBA8 kTopLeftColor = RGBA8::kBlack; |
| constexpr RGBA8 kBottomRightColor = RGBA8(3, 3, 0, 255); |
| |
| RGBA8 kCCWTriangleTopLeftColor = isCCWTriangleCulled ? kBackgroundColor : kTopLeftColor; |
| EXPECT_PIXEL_RGBA8_EQ(kCCWTriangleTopLeftColor, colorTexture, 0, 0); |
| |
| RGBA8 kCWTriangleBottomRightColor = |
| isCWTriangleCulled ? kBackgroundColor : kBottomRightColor; |
| EXPECT_PIXEL_RGBA8_EQ(kCWTriangleBottomRightColor, colorTexture, kSize - 1, kSize - 1); |
| } |
| |
| static constexpr uint32_t kSize = 4; |
| }; |
| |
| TEST_P(CullingTest, CullNoneWhenCCWIsFrontFace) { |
| DoTest(wgpu::FrontFace::CCW, wgpu::CullMode::None, false, false); |
| } |
| |
| TEST_P(CullingTest, CullFrontFaceWhenCCWIsFrontFace) { |
| DoTest(wgpu::FrontFace::CCW, wgpu::CullMode::Front, true, false); |
| } |
| |
| TEST_P(CullingTest, CullBackFaceWhenCCWIsFrontFace) { |
| DoTest(wgpu::FrontFace::CCW, wgpu::CullMode::Back, false, true); |
| } |
| |
| TEST_P(CullingTest, CullNoneWhenCWIsFrontFace) { |
| DoTest(wgpu::FrontFace::CW, wgpu::CullMode::None, false, false); |
| } |
| |
| TEST_P(CullingTest, CullFrontFaceWhenCWIsFrontFace) { |
| DoTest(wgpu::FrontFace::CW, wgpu::CullMode::Front, false, true); |
| } |
| |
| TEST_P(CullingTest, CullBackFaceWhenCWIsFrontFace) { |
| DoTest(wgpu::FrontFace::CW, wgpu::CullMode::Back, true, false); |
| } |
| |
| DAWN_INSTANTIATE_TEST(CullingTest, |
| D3D12Backend(), |
| MetalBackend(), |
| OpenGLBackend(), |
| OpenGLESBackend(), |
| VulkanBackend()); |