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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 "utils/ComboRenderPipelineDescriptor.h"
#include "utils/DawnHelpers.h"
class CullingTest : public DawnTest {
protected:
dawn::RenderPipeline CreatePipelineForTest(dawn::FrontFace frontFace, dawn::CullMode cullMode) {
utils::ComboRenderPipelineDescriptor pipelineDescriptor(device);
// Draw two triangles with different winding orders:
// 1. The top-left one is counterclockwise (CCW)
// 2. The bottom-right one is clockwise (CW)
const char* vs =
R"(#version 450
const vec2 pos[6] = vec2[6](vec2(-1.0f, -1.0f),
vec2(-1.0f, 0.0f),
vec2( 0.0f, -1.0f),
vec2( 0.0f, 1.0f),
vec2( 1.0f, 0.0f),
vec2( 1.0f, 1.0f));
void main() {
gl_Position = vec4(pos[gl_VertexIndex], 0.0, 1.0);
})";
pipelineDescriptor.cVertexStage.module =
utils::CreateShaderModule(device, utils::ShaderStage::Vertex, vs);
// gl_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 (gl_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.
const char* fs =
R"(#version 450
layout(location = 0) out vec4 fragColor;
void main() {
fragColor = vec4((gl_FragCoord.xy - vec2(0.5)) / 255, 0.0, 1.0);
})";
pipelineDescriptor.cFragmentStage.module =
utils::CreateShaderModule(device, utils::ShaderStage::Fragment, fs);
// Set culling mode and front face according to the parameters
pipelineDescriptor.cRasterizationState.frontFace = frontFace;
pipelineDescriptor.cRasterizationState.cullMode = cullMode;
return device.CreateRenderPipeline(&pipelineDescriptor);
}
dawn::Texture Create2DTextureForTest(dawn::TextureFormat format) {
dawn::TextureDescriptor textureDescriptor;
textureDescriptor.dimension = dawn::TextureDimension::e2D;
textureDescriptor.format = format;
textureDescriptor.usage =
dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::CopySrc;
textureDescriptor.arrayLayerCount = 1;
textureDescriptor.mipLevelCount = 1;
textureDescriptor.sampleCount = 1;
textureDescriptor.size = {kSize, kSize, 1};
return device.CreateTexture(&textureDescriptor);
}
void DoTest(dawn::FrontFace frontFace,
dawn::CullMode cullMode,
bool isCCWTriangleCulled,
bool isCWTriangleCulled) {
dawn::Texture colorTexture = Create2DTextureForTest(dawn::TextureFormat::RGBA8Unorm);
utils::ComboRenderPassDescriptor renderPassDescriptor({colorTexture.CreateDefaultView()});
renderPassDescriptor.cColorAttachmentsInfoPtr[0]->clearColor = {0.0, 0.0, 1.0, 1.0};
renderPassDescriptor.cColorAttachmentsInfoPtr[0]->loadOp = dawn::LoadOp::Clear;
dawn::CommandEncoder commandEncoder = device.CreateCommandEncoder();
dawn::RenderPassEncoder renderPass = commandEncoder.BeginRenderPass(&renderPassDescriptor);
renderPass.SetPipeline(CreatePipelineForTest(frontFace, cullMode));
renderPass.Draw(6, 1, 0, 0);
renderPass.EndPass();
dawn::CommandBuffer commandBuffer = commandEncoder.Finish();
dawn::Queue queue = device.CreateQueue();
queue.Submit(1, &commandBuffer);
constexpr RGBA8 kTopLeftColor = RGBA8(0, 0, 0, 255);
constexpr RGBA8 kBottomRightColor = RGBA8(3, 3, 0, 255);
constexpr RGBA8 kBackgroundColor = RGBA8(0, 0, 255, 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(dawn::FrontFace::CCW, dawn::CullMode::None, false, false);
}
TEST_P(CullingTest, CullFrontFaceWhenCCWIsFrontFace) {
DoTest(dawn::FrontFace::CCW, dawn::CullMode::Front, true, false);
}
TEST_P(CullingTest, CullBackFaceWhenCCWIsFrontFace) {
DoTest(dawn::FrontFace::CCW, dawn::CullMode::Back, false, true);
}
TEST_P(CullingTest, CullNoneWhenCWIsFrontFace) {
DoTest(dawn::FrontFace::CW, dawn::CullMode::None, false, false);
}
TEST_P(CullingTest, CullFrontFaceWhenCWIsFrontFace) {
DoTest(dawn::FrontFace::CW, dawn::CullMode::Front, false, true);
}
TEST_P(CullingTest, CullBackFaceWhenCWIsFrontFace) {
DoTest(dawn::FrontFace::CW, dawn::CullMode::Back, true, false);
}
DAWN_INSTANTIATE_TEST(CullingTest, D3D12Backend, MetalBackend, OpenGLBackend, VulkanBackend);