src/dawn/tests/white_box/ImmediateOffsetTests.cpp

// Copyright 2026 The Dawn & Tint Authors
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#include "src/dawn/native/ComputePipeline.h"
#include "src/dawn/native/ImmediatesLayout.h"
#include "src/dawn/native/ImmediatesTracker.h"
#include "src/dawn/native/RenderPipeline.h"
#include "src/dawn/tests/DawnTest.h"
#include "src/dawn/utils/ComboRenderPipelineDescriptor.h"
#include "src/dawn/utils/WGPUHelpers.h"
#include "src/utils/assert.h"

namespace dawn::native {
namespace {
DAWN_ENABLE_STRUCT_PADDING_WARNINGS
// Define render pipeline immediate data layout. Append members to
// expand the layout.
struct RenderImmediateTestConstants {
    UserImmediates userImmediates;

    ClampFragDepthArgs clampFragDepth;

    // first index offset
    uint32_t firstVertex;
    uint32_t firstInstance;
};
DAWN_DISABLE_STRUCT_PADDING_WARNINGS

class ImmediateOffsetTest : public DawnTest {
  protected:
    void SetUp() override {
        DawnTest::SetUp();
        DAWN_TEST_UNSUPPORTED_IF(UsesWire());
    }

    wgpu::RenderPipeline MakeTestRenderPipelineWithClampingFragDepth() {
        utils::ComboRenderPipelineDescriptor desc;
        desc.vertex.module = utils::CreateShaderModule(device, R"(
            @vertex fn main() -> @builtin(position) vec4f {
                return vec4f(0.0, 0.0, 0.0, 0.0);
            }
        )");
        desc.vertex.entryPoint = "main";
        desc.cFragment.module = utils::CreateShaderModule(device, R"(
            @fragment fn main() -> @builtin(frag_depth) f32 {
                return 1.0;
            }
        )");
        desc.cFragment.entryPoint = "main";
        desc.cFragment.targetCount = 0;
        wgpu::DepthStencilState* dsState = desc.EnableDepthStencil();
        dsState->depthWriteEnabled = wgpu::OptionalBool::True;
        dsState->depthCompare = wgpu::CompareFunction::Always;

        return device.CreateRenderPipeline(&desc);
    }
};

// Test pipeline change reset dirty bits and update tracked pipeline constants mask.
// Use Compute pipeline to cover this common path.
TEST_P(ImmediateOffsetTest, ClampFragDepth) {
    DAWN_SUPPRESS_TEST_IF(IsOpenGLES() || IsOpenGL() || IsMetal() || IsD3D11() || IsD3D12());
    ImmediateMask expectedImmediateMask = ImmediateMask(0);
    // Hard coded bits and index.
    expectedImmediateMask |=
        1u << (offsetof(RenderImmediateTestConstants, clampFragDepth) / kImmediateElementByteSize);
    expectedImmediateMask |=
        1u << (offsetof(RenderImmediateTestConstants, clampFragDepth) / kImmediateElementByteSize +
               1u);

    // Check dirty bits are set correctly.
    EXPECT_TRUE(FromAPI(MakeTestRenderPipelineWithClampingFragDepth().Get())->GetImmediateMask() ==
                expectedImmediateMask);
}

DAWN_INSTANTIATE_TEST(ImmediateOffsetTest,
                      D3D11Backend(),
                      D3D12Backend(),
                      MetalBackend(),
                      OpenGLBackend(),
                      OpenGLESBackend(),
                      VulkanBackend());

}  // anonymous namespace
}  // namespace dawn::native