src/dawn/tests/unittests/PerStageTests.cpp

// Copyright 2017 The Dawn & Tint Authors
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#include <gtest/gtest.h>

#include "dawn/native/PerStage.h"

namespace dawn::native {

// Tests for StageBit
TEST(PerStage, StageBit) {
    ASSERT_EQ(StageBit(SingleShaderStage::Vertex), wgpu::ShaderStage::Vertex);
    ASSERT_EQ(StageBit(SingleShaderStage::Fragment), wgpu::ShaderStage::Fragment);
    ASSERT_EQ(StageBit(SingleShaderStage::Compute), wgpu::ShaderStage::Compute);
}

// Basic test for the PerStage container
TEST(PerStage, PerStage) {
    PerStage<int> data;

    // Store data using wgpu::ShaderStage
    data[SingleShaderStage::Vertex] = 42;
    data[SingleShaderStage::Fragment] = 3;
    data[SingleShaderStage::Compute] = -1;

    // Load it using wgpu::ShaderStage
    ASSERT_EQ(data[wgpu::ShaderStage::Vertex], 42);
    ASSERT_EQ(data[wgpu::ShaderStage::Fragment], 3);
    ASSERT_EQ(data[wgpu::ShaderStage::Compute], -1);
}

// Test IterateStages with kAllStages
TEST(PerStage, IterateAllStages) {
    PerStage<int> counts;
    counts[SingleShaderStage::Vertex] = 0;
    counts[SingleShaderStage::Fragment] = 0;
    counts[SingleShaderStage::Compute] = 0;

    for (auto stage : IterateStages(kAllStages)) {
        counts[stage]++;
    }

    ASSERT_EQ(counts[wgpu::ShaderStage::Vertex], 1);
    ASSERT_EQ(counts[wgpu::ShaderStage::Fragment], 1);
    ASSERT_EQ(counts[wgpu::ShaderStage::Compute], 1);
}

// Test IterateStages with one stage
TEST(PerStage, IterateOneStage) {
    PerStage<int> counts;
    counts[SingleShaderStage::Vertex] = 0;
    counts[SingleShaderStage::Fragment] = 0;
    counts[SingleShaderStage::Compute] = 0;

    for (auto stage : IterateStages(wgpu::ShaderStage::Fragment)) {
        counts[stage]++;
    }

    ASSERT_EQ(counts[wgpu::ShaderStage::Vertex], 0);
    ASSERT_EQ(counts[wgpu::ShaderStage::Fragment], 1);
    ASSERT_EQ(counts[wgpu::ShaderStage::Compute], 0);
}

// Test IterateStages with no stage
TEST(PerStage, IterateNoStages) {
    PerStage<int> counts;
    counts[SingleShaderStage::Vertex] = 0;
    counts[SingleShaderStage::Fragment] = 0;
    counts[SingleShaderStage::Compute] = 0;

    for (auto stage : IterateStages(wgpu::ShaderStage::Fragment & wgpu::ShaderStage::Vertex)) {
        counts[stage]++;
    }

    ASSERT_EQ(counts[wgpu::ShaderStage::Vertex], 0);
    ASSERT_EQ(counts[wgpu::ShaderStage::Fragment], 0);
    ASSERT_EQ(counts[wgpu::ShaderStage::Compute], 0);
}

}  // namespace dawn::native