XCEngine/tests/Rendering/unit/test_builtin_forward_pipeline.cpp

#include <gtest/gtest.h>

#include <XCEngine/Rendering/Builtin/BuiltinPassLayoutUtils.h>
#include <XCEngine/Rendering/Passes/BuiltinDepthOnlyPass.h>
#include <XCEngine/Rendering/Passes/BuiltinObjectIdPass.h>
#include <XCEngine/Rendering/Passes/BuiltinShadowCasterPass.h>
#include <XCEngine/Rendering/Pipelines/BuiltinForwardPipeline.h>
#include <XCEngine/Resources/BuiltinResources.h>
#include <XCEngine/Resources/Mesh/Mesh.h>
#include <XCEngine/Resources/Shader/Shader.h>
#include <XCEngine/Resources/Shader/ShaderLoader.h>
#include <XCEngine/RHI/RHIEnums.h>

using namespace XCEngine::Rendering::Pipelines;
using namespace XCEngine::Rendering::Passes;
using namespace XCEngine::Rendering;
using namespace XCEngine::Containers;
using namespace XCEngine::Resources;
using namespace XCEngine::RHI;

TEST(BuiltinForwardPipeline_Test, UsesFloat3PositionInputLayoutForStaticMeshVertices) {
    const InputLayoutDesc inputLayout = BuiltinForwardPipeline::BuildInputLayout();

    ASSERT_EQ(inputLayout.elements.size(), 3u);

    const InputElementDesc& position = inputLayout.elements[0];
    EXPECT_EQ(position.semanticName, "POSITION");
    EXPECT_EQ(position.semanticIndex, 0u);
    EXPECT_EQ(position.format, static_cast<uint32_t>(Format::R32G32B32_Float));
    EXPECT_EQ(position.inputSlot, 0u);
    EXPECT_EQ(position.alignedByteOffset, 0u);

    const InputElementDesc& normal = inputLayout.elements[1];
    EXPECT_EQ(normal.semanticName, "NORMAL");
    EXPECT_EQ(normal.semanticIndex, 0u);
    EXPECT_EQ(normal.format, static_cast<uint32_t>(Format::R32G32B32_Float));
    EXPECT_EQ(normal.inputSlot, 0u);
    EXPECT_EQ(normal.alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, normal)));

    const InputElementDesc& texcoord = inputLayout.elements[2];
    EXPECT_EQ(texcoord.semanticName, "TEXCOORD");
    EXPECT_EQ(texcoord.semanticIndex, 0u);
    EXPECT_EQ(texcoord.format, static_cast<uint32_t>(Format::R32G32_Float));
    EXPECT_EQ(texcoord.inputSlot, 0u);
    EXPECT_EQ(texcoord.alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, uv0)));
}

TEST(BuiltinForwardPipeline_Test, SplitsSceneItemsIntoOpaqueAndTransparentQueueRanges) {
    EXPECT_FALSE(IsTransparentRenderQueue(static_cast<int>(MaterialRenderQueue::Background)));
    EXPECT_FALSE(IsTransparentRenderQueue(static_cast<int>(MaterialRenderQueue::Geometry)));
    EXPECT_FALSE(IsTransparentRenderQueue(static_cast<int>(MaterialRenderQueue::AlphaTest)));
    EXPECT_TRUE(IsTransparentRenderQueue(static_cast<int>(MaterialRenderQueue::Transparent)));
    EXPECT_TRUE(IsTransparentRenderQueue(static_cast<int>(MaterialRenderQueue::Overlay)));
}

TEST(BuiltinForwardPipeline_Test, BuiltinForwardShaderDeclaresExplicitForwardResourceContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinForwardLitShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPropertyDesc* cutoff = shader->FindProperty("_Cutoff");
    ASSERT_NE(cutoff, nullptr);
    EXPECT_EQ(cutoff->type, ShaderPropertyType::Range);
    EXPECT_EQ(cutoff->semantic, "AlphaCutoff");

    const ShaderPass* pass = shader->FindPass("ForwardLit");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 8u);

    EXPECT_EQ(pass->resources[0].semantic, "PerObject");
    EXPECT_EQ(pass->resources[0].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[0].set, 0u);
    EXPECT_EQ(pass->resources[0].binding, 0u);

    EXPECT_EQ(pass->resources[1].semantic, "Lighting");
    EXPECT_EQ(pass->resources[1].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[1].set, 1u);
    EXPECT_EQ(pass->resources[1].binding, 0u);

    EXPECT_EQ(pass->resources[2].semantic, "Material");
    EXPECT_EQ(pass->resources[2].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[2].set, 2u);
    EXPECT_EQ(pass->resources[2].binding, 0u);

    EXPECT_EQ(pass->resources[3].semantic, "ShadowReceiver");
    EXPECT_EQ(pass->resources[3].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[3].set, 3u);
    EXPECT_EQ(pass->resources[3].binding, 0u);

    EXPECT_EQ(pass->resources[4].semantic, "BaseColorTexture");
    EXPECT_EQ(pass->resources[4].type, ShaderResourceType::Texture2D);
    EXPECT_EQ(pass->resources[4].set, 4u);
    EXPECT_EQ(pass->resources[4].binding, 0u);

    EXPECT_EQ(pass->resources[5].semantic, "LinearClampSampler");
    EXPECT_EQ(pass->resources[5].type, ShaderResourceType::Sampler);
    EXPECT_EQ(pass->resources[5].set, 5u);
    EXPECT_EQ(pass->resources[5].binding, 0u);

    EXPECT_EQ(pass->resources[6].semantic, "ShadowMapTexture");
    EXPECT_EQ(pass->resources[6].type, ShaderResourceType::Texture2D);
    EXPECT_EQ(pass->resources[6].set, 6u);
    EXPECT_EQ(pass->resources[6].binding, 0u);

    EXPECT_EQ(pass->resources[7].semantic, "ShadowMapSampler");
    EXPECT_EQ(pass->resources[7].type, ShaderResourceType::Sampler);
    EXPECT_EQ(pass->resources[7].set, 7u);
    EXPECT_EQ(pass->resources[7].binding, 0u);

    delete shader;
}

TEST(BuiltinForwardPipeline_Test, BuiltinUnlitShaderDeclaresExplicitSurfaceResourceContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinUnlitShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("Unlit");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 4u);

    EXPECT_EQ(pass->resources[0].semantic, "PerObject");
    EXPECT_EQ(pass->resources[0].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[0].set, 0u);
    EXPECT_EQ(pass->resources[0].binding, 0u);

    EXPECT_EQ(pass->resources[1].semantic, "Material");
    EXPECT_EQ(pass->resources[1].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[1].set, 1u);
    EXPECT_EQ(pass->resources[1].binding, 0u);

    EXPECT_EQ(pass->resources[2].semantic, "BaseColorTexture");
    EXPECT_EQ(pass->resources[2].type, ShaderResourceType::Texture2D);
    EXPECT_EQ(pass->resources[2].set, 2u);
    EXPECT_EQ(pass->resources[2].binding, 0u);

    EXPECT_EQ(pass->resources[3].semantic, "LinearClampSampler");
    EXPECT_EQ(pass->resources[3].type, ShaderResourceType::Sampler);
    EXPECT_EQ(pass->resources[3].set, 3u);
    EXPECT_EQ(pass->resources[3].binding, 0u);

    delete shader;
}

TEST(BuiltinForwardPipeline_Test, BuiltinSkyboxShaderDeclaresExplicitEnvironmentResourceContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinSkyboxShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("Skybox");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 5u);

    const ShaderPropertyDesc* tint = shader->FindProperty("_Tint");
    ASSERT_NE(tint, nullptr);
    EXPECT_EQ(tint->type, ShaderPropertyType::Color);
    EXPECT_EQ(tint->semantic, "Tint");

    const ShaderPropertyDesc* exposure = shader->FindProperty("_Exposure");
    ASSERT_NE(exposure, nullptr);
    EXPECT_EQ(exposure->type, ShaderPropertyType::Float);
    EXPECT_EQ(exposure->semantic, "Exposure");

    const ShaderPropertyDesc* rotation = shader->FindProperty("_Rotation");
    ASSERT_NE(rotation, nullptr);
    EXPECT_EQ(rotation->type, ShaderPropertyType::Float);
    EXPECT_EQ(rotation->semantic, "Rotation");

    const ShaderPropertyDesc* panoramic = shader->FindProperty("_MainTex");
    ASSERT_NE(panoramic, nullptr);
    EXPECT_EQ(panoramic->type, ShaderPropertyType::Texture2D);
    EXPECT_EQ(panoramic->semantic, "SkyboxPanoramicTexture");

    const ShaderPropertyDesc* cubemap = shader->FindProperty("_Tex");
    ASSERT_NE(cubemap, nullptr);
    EXPECT_EQ(cubemap->type, ShaderPropertyType::TextureCube);
    EXPECT_EQ(cubemap->semantic, "SkyboxTexture");

    EXPECT_EQ(pass->resources[0].semantic, "Environment");
    EXPECT_EQ(pass->resources[0].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[0].set, 0u);
    EXPECT_EQ(pass->resources[0].binding, 0u);

    EXPECT_EQ(pass->resources[1].semantic, "Material");
    EXPECT_EQ(pass->resources[1].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[1].set, 1u);
    EXPECT_EQ(pass->resources[1].binding, 0u);

    EXPECT_EQ(pass->resources[2].semantic, "SkyboxPanoramicTexture");
    EXPECT_EQ(pass->resources[2].type, ShaderResourceType::Texture2D);
    EXPECT_EQ(pass->resources[2].set, 2u);
    EXPECT_EQ(pass->resources[2].binding, 0u);

    EXPECT_EQ(pass->resources[3].semantic, "SkyboxTexture");
    EXPECT_EQ(pass->resources[3].type, ShaderResourceType::TextureCube);
    EXPECT_EQ(pass->resources[3].set, 3u);
    EXPECT_EQ(pass->resources[3].binding, 0u);

    EXPECT_EQ(pass->resources[4].semantic, "LinearClampSampler");
    EXPECT_EQ(pass->resources[4].type, ShaderResourceType::Sampler);
    EXPECT_EQ(pass->resources[4].set, 4u);
    EXPECT_EQ(pass->resources[4].binding, 0u);

    delete shader;
}

TEST(BuiltinForwardPipeline_Test, BuiltinFinalColorShaderDeclaresExplicitFullscreenResourceContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinFinalColorShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("FinalColor");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 3u);

    const ShaderPropertyDesc* colorScale = shader->FindProperty("_ColorScale");
    ASSERT_NE(colorScale, nullptr);
    EXPECT_EQ(colorScale->type, ShaderPropertyType::Color);

    const ShaderPropertyDesc* exposure = shader->FindProperty("_Exposure");
    ASSERT_NE(exposure, nullptr);
    EXPECT_EQ(exposure->type, ShaderPropertyType::Float);

    const ShaderPropertyDesc* outputTransferMode = shader->FindProperty("_OutputTransferMode");
    ASSERT_NE(outputTransferMode, nullptr);
    EXPECT_EQ(outputTransferMode->type, ShaderPropertyType::Float);

    const ShaderPropertyDesc* toneMappingMode = shader->FindProperty("_ToneMappingMode");
    ASSERT_NE(toneMappingMode, nullptr);
    EXPECT_EQ(toneMappingMode->type, ShaderPropertyType::Float);

    EXPECT_STREQ(pass->resources[0].name.CStr(), "FinalColorConstants");
    EXPECT_EQ(pass->resources[0].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[0].set, 0u);
    EXPECT_EQ(pass->resources[0].binding, 0u);

    EXPECT_STREQ(pass->resources[1].name.CStr(), "SourceColorTexture");
    EXPECT_EQ(pass->resources[1].type, ShaderResourceType::Texture2D);
    EXPECT_EQ(pass->resources[1].set, 1u);
    EXPECT_EQ(pass->resources[1].binding, 0u);

    EXPECT_STREQ(pass->resources[2].name.CStr(), "LinearClampSampler");
    EXPECT_EQ(pass->resources[2].type, ShaderResourceType::Sampler);
    EXPECT_EQ(pass->resources[2].set, 2u);
    EXPECT_EQ(pass->resources[2].binding, 0u);

    delete shader;
}

TEST(BuiltinForwardPipeline_Test, BuildsBuiltinPassResourceBindingPlanFromExplicitForwardResources) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinForwardLitShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ForwardLit");
    ASSERT_NE(pass, nullptr);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    EXPECT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass->resources, plan, &error)) << error.CStr();
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_TRUE(plan.lighting.IsValid());
    EXPECT_TRUE(plan.material.IsValid());
    EXPECT_TRUE(plan.shadowReceiver.IsValid());
    EXPECT_TRUE(plan.baseColorTexture.IsValid());
    EXPECT_TRUE(plan.linearClampSampler.IsValid());
    EXPECT_TRUE(plan.shadowMapTexture.IsValid());
    EXPECT_TRUE(plan.shadowMapSampler.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 8u);
    EXPECT_TRUE(plan.usesConstantBuffers);
    EXPECT_TRUE(plan.usesTextures);
    EXPECT_TRUE(plan.usesSamplers);

    delete shader;
}

TEST(BuiltinForwardPipeline_Test, BuildsBuiltinPassResourceBindingPlanFromImplicitForwardContract) {
    ShaderPass pass = {};
    pass.name = "ForwardLit";

    ShaderPassTagEntry tag = {};
    tag.name = "LightMode";
    tag.value = "ForwardBase";
    pass.tags.PushBack(tag);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    EXPECT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass, plan, &error)) << error.CStr();
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_TRUE(plan.lighting.IsValid());
    EXPECT_TRUE(plan.material.IsValid());
    EXPECT_TRUE(plan.shadowReceiver.IsValid());
    EXPECT_TRUE(plan.baseColorTexture.IsValid());
    EXPECT_TRUE(plan.linearClampSampler.IsValid());
    EXPECT_TRUE(plan.shadowMapTexture.IsValid());
    EXPECT_TRUE(plan.shadowMapSampler.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 8u);
}

TEST(BuiltinForwardPipeline_Test, BuildsBuiltinPassResourceBindingPlanFromExplicitUnlitResources) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinUnlitShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("Unlit");
    ASSERT_NE(pass, nullptr);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    EXPECT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass->resources, plan, &error)) << error.CStr();
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_TRUE(plan.material.IsValid());
    EXPECT_TRUE(plan.baseColorTexture.IsValid());
    EXPECT_TRUE(plan.linearClampSampler.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 4u);
    EXPECT_TRUE(plan.usesConstantBuffers);
    EXPECT_TRUE(plan.usesTextures);
    EXPECT_TRUE(plan.usesSamplers);

    delete shader;
}

TEST(BuiltinForwardPipeline_Test, UsesNormalizedExplicitSetIndicesForSurfaceResources) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinForwardLitShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ForwardLit");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 8u);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    EXPECT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass->resources, plan, &error)) << error.CStr();
    ASSERT_EQ(plan.bindings.Size(), 8u);
    EXPECT_EQ(plan.perObject.set, 0u);
    EXPECT_EQ(plan.lighting.set, 1u);
    EXPECT_EQ(plan.material.set, 2u);
    EXPECT_EQ(plan.shadowReceiver.set, 3u);
    EXPECT_EQ(plan.baseColorTexture.set, 4u);
    EXPECT_EQ(plan.linearClampSampler.set, 5u);
    EXPECT_EQ(plan.shadowMapTexture.set, 6u);
    EXPECT_EQ(plan.shadowMapSampler.set, 7u);

    delete shader;
}

TEST(BuiltinPassLayout_Test, BuildsSharedSetLayoutsFromExplicitForwardResources) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinForwardLitShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ForwardLit");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 8u);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    ASSERT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass->resources, plan, &error)) << error.CStr();

    std::vector<BuiltinPassSetLayoutMetadata> setLayouts;
    ASSERT_TRUE(TryBuildBuiltinPassSetLayouts(plan, setLayouts, &error)) << error.CStr();
    ASSERT_EQ(setLayouts.size(), 8u);

    EXPECT_EQ(setLayouts[0].layout.bindingCount, 1u);
    EXPECT_FALSE(setLayouts[0].shaderVisible);
    EXPECT_TRUE(setLayouts[0].usesPerObject);
    EXPECT_FALSE(setLayouts[0].usesMaterial);

    EXPECT_EQ(setLayouts[1].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[1].usesLighting);
    EXPECT_FALSE(setLayouts[1].shaderVisible);

    EXPECT_EQ(setLayouts[2].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[2].usesMaterial);
    EXPECT_FALSE(setLayouts[2].shaderVisible);

    EXPECT_EQ(setLayouts[3].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[3].usesShadowReceiver);
    EXPECT_FALSE(setLayouts[3].shaderVisible);

    EXPECT_EQ(setLayouts[4].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[4].usesTexture);
    EXPECT_TRUE(setLayouts[4].shaderVisible);
    EXPECT_EQ(setLayouts[4].heapType, DescriptorHeapType::CBV_SRV_UAV);

    EXPECT_EQ(setLayouts[5].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[5].usesSampler);
    EXPECT_TRUE(setLayouts[5].shaderVisible);
    EXPECT_EQ(setLayouts[5].heapType, DescriptorHeapType::Sampler);

    EXPECT_EQ(setLayouts[6].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[6].usesTexture);
    EXPECT_TRUE(setLayouts[6].shaderVisible);

    EXPECT_EQ(setLayouts[7].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[7].usesSampler);
    EXPECT_TRUE(setLayouts[7].shaderVisible);
    EXPECT_EQ(setLayouts[7].heapType, DescriptorHeapType::Sampler);

    delete shader;
}

TEST(BuiltinDepthStylePass_Test, BuiltinDepthOnlyShaderDeclaresExplicitPerObjectResourceContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinDepthOnlyShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("DepthOnly");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 4u);

    EXPECT_EQ(pass->resources[0].semantic, "PerObject");
    EXPECT_EQ(pass->resources[0].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[0].set, 0u);
    EXPECT_EQ(pass->resources[0].binding, 0u);
    EXPECT_EQ(pass->resources[1].semantic, "Material");
    EXPECT_EQ(pass->resources[1].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[1].set, 1u);
    EXPECT_EQ(pass->resources[1].binding, 0u);
    EXPECT_EQ(pass->resources[2].semantic, "BaseColorTexture");
    EXPECT_EQ(pass->resources[2].type, ShaderResourceType::Texture2D);
    EXPECT_EQ(pass->resources[2].set, 2u);
    EXPECT_EQ(pass->resources[2].binding, 0u);
    EXPECT_EQ(pass->resources[3].semantic, "LinearClampSampler");
    EXPECT_EQ(pass->resources[3].type, ShaderResourceType::Sampler);
    EXPECT_EQ(pass->resources[3].set, 3u);
    EXPECT_EQ(pass->resources[3].binding, 0u);

    delete shader;
}

TEST(BuiltinDepthStylePass_Test, BuiltinShadowCasterShaderDeclaresExplicitPerObjectResourceContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinShadowCasterShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ShadowCaster");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 4u);

    EXPECT_EQ(pass->resources[0].semantic, "PerObject");
    EXPECT_EQ(pass->resources[0].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[0].set, 0u);
    EXPECT_EQ(pass->resources[0].binding, 0u);
    EXPECT_EQ(pass->resources[1].semantic, "Material");
    EXPECT_EQ(pass->resources[1].type, ShaderResourceType::ConstantBuffer);
    EXPECT_EQ(pass->resources[1].set, 1u);
    EXPECT_EQ(pass->resources[1].binding, 0u);
    EXPECT_EQ(pass->resources[2].semantic, "BaseColorTexture");
    EXPECT_EQ(pass->resources[2].type, ShaderResourceType::Texture2D);
    EXPECT_EQ(pass->resources[2].set, 2u);
    EXPECT_EQ(pass->resources[2].binding, 0u);
    EXPECT_EQ(pass->resources[3].semantic, "LinearClampSampler");
    EXPECT_EQ(pass->resources[3].type, ShaderResourceType::Sampler);
    EXPECT_EQ(pass->resources[3].set, 3u);
    EXPECT_EQ(pass->resources[3].binding, 0u);

    delete shader;
}

TEST(BuiltinObjectIdPass_Test, BuiltinObjectIdShaderUsesUnityStyleSingleSourceContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinObjectIdShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ObjectId");
    ASSERT_NE(pass, nullptr);
    EXPECT_TRUE(pass->resources.Empty());
    EXPECT_TRUE(pass->hasFixedFunctionState);
    EXPECT_EQ(pass->fixedFunctionState.cullMode, MaterialCullMode::Back);
    EXPECT_TRUE(pass->fixedFunctionState.depthWriteEnable);
    EXPECT_EQ(pass->fixedFunctionState.depthFunc, MaterialComparisonFunc::LessEqual);

    delete shader;
}

TEST(BuiltinObjectIdPass_Test, BuildsBuiltinPassResourceBindingPlanFromBuiltinObjectIdShaderContract) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinObjectIdShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ObjectId");
    ASSERT_NE(pass, nullptr);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    EXPECT_TRUE(TryBuildBuiltinPassResourceBindingPlan(*pass, plan, &error)) << error.CStr();
    ASSERT_EQ(plan.bindings.Size(), 1u);
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_FALSE(plan.material.IsValid());
    EXPECT_FALSE(plan.baseColorTexture.IsValid());
    EXPECT_FALSE(plan.linearClampSampler.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 1u);
    EXPECT_TRUE(plan.usesConstantBuffers);
    EXPECT_FALSE(plan.usesTextures);
    EXPECT_FALSE(plan.usesSamplers);

    delete shader;
}

TEST(BuiltinObjectIdPass_Test, BuildsBuiltinPassResourceBindingPlanFromImplicitObjectIdContract) {
    ShaderPass pass = {};
    pass.name = "ObjectId";

    ShaderPassTagEntry tag = {};
    tag.name = "LightMode";
    tag.value = "ObjectId";
    pass.tags.PushBack(tag);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    EXPECT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass, plan, &error)) << error.CStr();
    ASSERT_EQ(plan.bindings.Size(), 1u);
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_FALSE(plan.material.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 1u);
}

TEST(BuiltinDepthStylePass_Test, BuildsBuiltinPassResourceBindingPlanFromImplicitDepthOnlyContract) {
    ShaderPass pass = {};
    pass.name = "DepthOnly";

    ShaderPassTagEntry tag = {};
    tag.name = "LightMode";
    tag.value = "DepthOnly";
    pass.tags.PushBack(tag);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    EXPECT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass, plan, &error)) << error.CStr();
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_TRUE(plan.material.IsValid());
    EXPECT_TRUE(plan.baseColorTexture.IsValid());
    EXPECT_TRUE(plan.linearClampSampler.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 4u);
}

TEST(BuiltinObjectIdPass_Test, UsesFloat3PositionInputLayoutForStaticMeshVertices) {
    const InputLayoutDesc inputLayout = BuiltinObjectIdPass::BuildInputLayout();

    ASSERT_EQ(inputLayout.elements.size(), 3u);

    const InputElementDesc& position = inputLayout.elements[0];
    EXPECT_EQ(position.semanticName, "POSITION");
    EXPECT_EQ(position.semanticIndex, 0u);
    EXPECT_EQ(position.format, static_cast<uint32_t>(Format::R32G32B32_Float));
    EXPECT_EQ(position.inputSlot, 0u);
    EXPECT_EQ(position.alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, position)));

    const InputElementDesc& normal = inputLayout.elements[1];
    EXPECT_EQ(normal.semanticName, "NORMAL");
    EXPECT_EQ(normal.semanticIndex, 0u);
    EXPECT_EQ(normal.format, static_cast<uint32_t>(Format::R32G32B32_Float));
    EXPECT_EQ(normal.inputSlot, 0u);
    EXPECT_EQ(normal.alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, normal)));

    const InputElementDesc& texcoord = inputLayout.elements[2];
    EXPECT_EQ(texcoord.semanticName, "TEXCOORD");
    EXPECT_EQ(texcoord.semanticIndex, 0u);
    EXPECT_EQ(texcoord.format, static_cast<uint32_t>(Format::R32G32_Float));
    EXPECT_EQ(texcoord.inputSlot, 0u);
    EXPECT_EQ(texcoord.alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, uv0)));
}

TEST(BuiltinPassLayout_Test, BuildsSharedSetLayoutsFromExplicitObjectIdResources) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinObjectIdShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ObjectId");
    ASSERT_NE(pass, nullptr);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    ASSERT_TRUE(TryBuildBuiltinPassResourceBindingPlan(*pass, plan, &error)) << error.CStr();

    std::vector<BuiltinPassSetLayoutMetadata> setLayouts;
    ASSERT_TRUE(TryBuildBuiltinPassSetLayouts(plan, setLayouts, &error)) << error.CStr();
    ASSERT_EQ(setLayouts.size(), 1u);
    EXPECT_EQ(setLayouts[0].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[0].usesPerObject);
    EXPECT_FALSE(setLayouts[0].usesMaterial);
    EXPECT_FALSE(setLayouts[0].usesTexture);
    EXPECT_FALSE(setLayouts[0].usesSampler);
    EXPECT_FALSE(setLayouts[0].shaderVisible);
    EXPECT_EQ(setLayouts[0].heapType, DescriptorHeapType::CBV_SRV_UAV);

    delete shader;
}

TEST(BuiltinPassLayout_Test, BuildsSharedSetLayoutsFromExplicitDepthOnlyResources) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinDepthOnlyShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("DepthOnly");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 4u);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    ASSERT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass->resources, plan, &error)) << error.CStr();
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_TRUE(plan.material.IsValid());
    EXPECT_TRUE(plan.baseColorTexture.IsValid());
    EXPECT_TRUE(plan.linearClampSampler.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 4u);
    EXPECT_TRUE(plan.usesConstantBuffers);
    EXPECT_TRUE(plan.usesTextures);
    EXPECT_TRUE(plan.usesSamplers);

    std::vector<BuiltinPassSetLayoutMetadata> setLayouts;
    ASSERT_TRUE(TryBuildBuiltinPassSetLayouts(plan, setLayouts, &error)) << error.CStr();
    ASSERT_EQ(setLayouts.size(), 4u);
    EXPECT_EQ(setLayouts[0].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[0].usesPerObject);
    EXPECT_FALSE(setLayouts[0].usesMaterial);
    EXPECT_FALSE(setLayouts[0].usesTexture);
    EXPECT_FALSE(setLayouts[0].usesSampler);
    EXPECT_EQ(setLayouts[1].layout.bindingCount, 1u);
    EXPECT_FALSE(setLayouts[1].usesPerObject);
    EXPECT_TRUE(setLayouts[1].usesMaterial);
    EXPECT_FALSE(setLayouts[1].usesTexture);
    EXPECT_FALSE(setLayouts[1].usesSampler);
    EXPECT_EQ(setLayouts[2].layout.bindingCount, 1u);
    EXPECT_FALSE(setLayouts[2].usesPerObject);
    EXPECT_FALSE(setLayouts[2].usesMaterial);
    EXPECT_TRUE(setLayouts[2].usesTexture);
    EXPECT_FALSE(setLayouts[2].usesSampler);
    EXPECT_TRUE(setLayouts[2].shaderVisible);
    EXPECT_EQ(setLayouts[3].layout.bindingCount, 1u);
    EXPECT_FALSE(setLayouts[3].usesPerObject);
    EXPECT_FALSE(setLayouts[3].usesMaterial);
    EXPECT_FALSE(setLayouts[3].usesTexture);
    EXPECT_TRUE(setLayouts[3].usesSampler);
    EXPECT_TRUE(setLayouts[3].shaderVisible);
    EXPECT_EQ(setLayouts[3].heapType, DescriptorHeapType::Sampler);

    delete shader;
}

TEST(BuiltinPassLayout_Test, BuildsSharedSetLayoutsFromExplicitShadowCasterResources) {
    ShaderLoader loader;
    LoadResult result = loader.Load(GetBuiltinShadowCasterShaderPath());
    ASSERT_TRUE(result);
    ASSERT_NE(result.resource, nullptr);

    Shader* shader = static_cast<Shader*>(result.resource);
    ASSERT_NE(shader, nullptr);

    const ShaderPass* pass = shader->FindPass("ShadowCaster");
    ASSERT_NE(pass, nullptr);
    ASSERT_EQ(pass->resources.Size(), 4u);

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    ASSERT_TRUE(TryBuildBuiltinPassResourceBindingPlan(pass->resources, plan, &error)) << error.CStr();
    EXPECT_TRUE(plan.perObject.IsValid());
    EXPECT_TRUE(plan.material.IsValid());
    EXPECT_TRUE(plan.baseColorTexture.IsValid());
    EXPECT_TRUE(plan.linearClampSampler.IsValid());
    EXPECT_EQ(plan.firstDescriptorSet, 0u);
    EXPECT_EQ(plan.descriptorSetCount, 4u);
    EXPECT_TRUE(plan.usesConstantBuffers);
    EXPECT_TRUE(plan.usesTextures);
    EXPECT_TRUE(plan.usesSamplers);

    std::vector<BuiltinPassSetLayoutMetadata> setLayouts;
    ASSERT_TRUE(TryBuildBuiltinPassSetLayouts(plan, setLayouts, &error)) << error.CStr();
    ASSERT_EQ(setLayouts.size(), 4u);
    EXPECT_EQ(setLayouts[0].layout.bindingCount, 1u);
    EXPECT_TRUE(setLayouts[0].usesPerObject);
    EXPECT_FALSE(setLayouts[0].usesMaterial);
    EXPECT_FALSE(setLayouts[0].usesTexture);
    EXPECT_FALSE(setLayouts[0].usesSampler);
    EXPECT_EQ(setLayouts[1].layout.bindingCount, 1u);
    EXPECT_FALSE(setLayouts[1].usesPerObject);
    EXPECT_TRUE(setLayouts[1].usesMaterial);
    EXPECT_FALSE(setLayouts[1].usesTexture);
    EXPECT_FALSE(setLayouts[1].usesSampler);
    EXPECT_EQ(setLayouts[2].layout.bindingCount, 1u);
    EXPECT_FALSE(setLayouts[2].usesPerObject);
    EXPECT_FALSE(setLayouts[2].usesMaterial);
    EXPECT_TRUE(setLayouts[2].usesTexture);
    EXPECT_FALSE(setLayouts[2].usesSampler);
    EXPECT_TRUE(setLayouts[2].shaderVisible);
    EXPECT_EQ(setLayouts[3].layout.bindingCount, 1u);
    EXPECT_FALSE(setLayouts[3].usesPerObject);
    EXPECT_FALSE(setLayouts[3].usesMaterial);
    EXPECT_FALSE(setLayouts[3].usesTexture);
    EXPECT_TRUE(setLayouts[3].usesSampler);
    EXPECT_TRUE(setLayouts[3].shaderVisible);
    EXPECT_EQ(setLayouts[3].heapType, DescriptorHeapType::Sampler);

    delete shader;
}

TEST(BuiltinPassLayout_Test, RejectsMixedSamplerAndNonSamplerBindingsInOneSet) {
    Array<ShaderResourceBindingDesc> bindings;
    bindings.Resize(2);

    bindings[0].name = "BaseColorTexture";
    bindings[0].type = ShaderResourceType::Texture2D;
    bindings[0].set = 0;
    bindings[0].binding = 0;
    bindings[0].semantic = "BaseColorTexture";

    bindings[1].name = "LinearClampSampler";
    bindings[1].type = ShaderResourceType::Sampler;
    bindings[1].set = 0;
    bindings[1].binding = 1;
    bindings[1].semantic = "LinearClampSampler";

    BuiltinPassResourceBindingPlan plan = {};
    String error;
    ASSERT_TRUE(TryBuildBuiltinPassResourceBindingPlan(bindings, plan, &error)) << error.CStr();

    std::vector<BuiltinPassSetLayoutMetadata> setLayouts;
    EXPECT_FALSE(TryBuildBuiltinPassSetLayouts(plan, setLayouts, &error));
    EXPECT_EQ(error, "Builtin pass does not support mixing sampler and non-sampler bindings in one set");
}

TEST(BuiltinPassLayout_Test, RejectsDuplicateBindingsInOneSet) {
    BuiltinPassResourceBindingPlan plan = {};
    BuiltinPassResourceBindingDesc perObjectBinding = {};
    perObjectBinding.semantic = BuiltinPassResourceSemantic::PerObject;
    perObjectBinding.resourceType = ShaderResourceType::ConstantBuffer;
    perObjectBinding.location = { 0, 0 };
    plan.bindings.PushBack(perObjectBinding);

    BuiltinPassResourceBindingDesc materialBinding = {};
    materialBinding.semantic = BuiltinPassResourceSemantic::Material;
    materialBinding.resourceType = ShaderResourceType::ConstantBuffer;
    materialBinding.location = { 0, 0 };
    plan.bindings.PushBack(materialBinding);
    plan.maxSetIndex = 0;
    plan.firstDescriptorSet = 0;
    plan.descriptorSetCount = 1;
    plan.usesConstantBuffers = true;
    plan.perObject = { 0, 0 };
    plan.material = { 0, 0 };

    std::vector<BuiltinPassSetLayoutMetadata> setLayouts;
    String error;
    EXPECT_FALSE(TryBuildBuiltinPassSetLayouts(plan, setLayouts, &error));
    EXPECT_EQ(error, "Builtin pass encountered duplicate bindings inside one descriptor set");
}

TEST(BuiltinDepthOnlyPass_Test, UsesFloat3PositionInputLayoutForStaticMeshVertices) {
    const InputLayoutDesc inputLayout = BuiltinDepthOnlyPass::BuildInputLayout();

    ASSERT_EQ(inputLayout.elements.size(), 3u);
    EXPECT_EQ(inputLayout.elements[0].semanticName, "POSITION");
    EXPECT_EQ(inputLayout.elements[1].semanticName, "NORMAL");
    EXPECT_EQ(inputLayout.elements[2].semanticName, "TEXCOORD");
    EXPECT_EQ(inputLayout.elements[0].alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, position)));
    EXPECT_EQ(inputLayout.elements[1].alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, normal)));
    EXPECT_EQ(inputLayout.elements[2].alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, uv0)));
}

TEST(BuiltinShadowCasterPass_Test, UsesFloat3PositionInputLayoutForStaticMeshVertices) {
    const InputLayoutDesc inputLayout = BuiltinShadowCasterPass::BuildInputLayout();

    ASSERT_EQ(inputLayout.elements.size(), 3u);
    EXPECT_EQ(inputLayout.elements[0].semanticName, "POSITION");
    EXPECT_EQ(inputLayout.elements[1].semanticName, "NORMAL");
    EXPECT_EQ(inputLayout.elements[2].semanticName, "TEXCOORD");
    EXPECT_EQ(inputLayout.elements[0].alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, position)));
    EXPECT_EQ(inputLayout.elements[1].alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, normal)));
    EXPECT_EQ(inputLayout.elements[2].alignedByteOffset, static_cast<uint32_t>(offsetof(StaticMeshVertex, uv0)));
}