refactor: route builtin infinite grid through shader assets

engine/include/XCEngine/Rendering/Passes/BuiltinInfiniteGridPass.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #include <XCEngine/Core/Math/Vector3.h>
+#include <XCEngine/Core/Asset/ResourceHandle.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
 #include <XCEngine/Rendering/RenderContext.h>
 #include <XCEngine/Rendering/RenderSurface.h>
 
@@ -9,6 +11,7 @@
 #include <XCEngine/RHI/RHIEnums.h>
 #include <XCEngine/RHI/RHIPipelineLayout.h>
 #include <XCEngine/RHI/RHIPipelineState.h>
+#include <XCEngine/Resources/Shader/Shader.h>
 
 namespace XCEngine {
 namespace Rendering {
@@ -57,6 +60,7 @@ private:
     RHI::RHIPipelineState* m_pipelineState = nullptr;
     RHI::RHIDescriptorPool* m_constantPool = nullptr;
     RHI::RHIDescriptorSet* m_constantSet = nullptr;
+    Resources::ResourceHandle<Resources::Shader> m_builtinInfiniteGridShader;
 };
 
 } // namespace Passes

engine/include/XCEngine/Resources/BuiltinResources.h

@@ -25,6 +25,7 @@ Containers::String GetBuiltinPrimitiveMeshPath(BuiltinPrimitiveType primitiveTyp
 Containers::String GetBuiltinDefaultPrimitiveMaterialPath();
 Containers::String GetBuiltinForwardLitShaderPath();
 Containers::String GetBuiltinObjectIdShaderPath();
+Containers::String GetBuiltinInfiniteGridShaderPath();
 Containers::String GetBuiltinDefaultPrimitiveTexturePath();
 
 bool TryParseBuiltinPrimitiveType(const Containers::String& path, BuiltinPrimitiveType& outPrimitiveType);

engine/src/Rendering/Passes/BuiltinInfiniteGridPass.cpp

@@ -2,12 +2,16 @@
 
 #include <XCEngine/Core/Math/Matrix4.h>
 #include <XCEngine/Core/Math/Vector4.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
+#include <XCEngine/Debug/Logger.h>
 #include <XCEngine/RHI/RHICommandList.h>
 #include <XCEngine/RHI/RHIDevice.h>
+#include <XCEngine/Resources/BuiltinResources.h>
+
+#include "Rendering/Detail/ShaderVariantUtils.h"
 
 #include <algorithm>
 #include <cmath>
-#include <cstring>
 
 namespace XCEngine {
 namespace Rendering {
@@ -20,152 +24,6 @@ constexpr float kTransitionStart = 0.65f;
 constexpr float kTransitionEnd = 0.95f;
 constexpr float kMinimumVerticalViewComponent = 0.15f;
 
-const char kBuiltinInfiniteGridHlsl[] = R"(
-cbuffer GridConstants : register(b0) {
-    float4x4 gViewProjectionMatrix;
-    float4 gCameraPositionAndScale;
-    float4 gCameraRightAndFade;
-    float4 gCameraUpAndTanHalfFov;
-    float4 gCameraForwardAndAspect;
-    float4 gViewportNearFar;
-    float4 gGridTransition;
-};
-
-struct VSOutput {
-    float4 position : SV_POSITION;
-};
-
-VSOutput MainVS(uint vertexId : SV_VertexID) {
-    static const float2 positions[3] = {
-        float2(-1.0, -1.0),
-        float2(-1.0,  3.0),
-        float2( 3.0, -1.0)
-    };
-
-    VSOutput output;
-    output.position = float4(positions[vertexId], 0.0, 1.0);
-    return output;
-}
-
-float PristineGridLine(float2 uv) {
-    float2 deriv = max(fwidth(uv), float2(1e-6, 1e-6));
-    float2 uvMod = frac(uv);
-    float2 uvDist = min(uvMod, 1.0 - uvMod);
-    float2 distInPixels = uvDist / deriv;
-    float2 lineAlpha = 1.0 - smoothstep(0.0, 1.0, distInPixels);
-    float density = max(deriv.x, deriv.y);
-    float densityFade = 1.0 - smoothstep(0.5, 1.0, density);
-    return max(lineAlpha.x, lineAlpha.y) * densityFade;
-}
-
-float AxisLineAA(float coord, float deriv) {
-    float distInPixels = abs(coord) / max(deriv, 1e-6);
-    return 1.0 - smoothstep(0.0, 1.5, distInPixels);
-}
-
-struct GridLayer {
-    float minor;
-    float major;
-};
-
-GridLayer SampleGridLayer(float2 worldPos2D, float baseScale) {
-    GridLayer layer;
-    const float2 gridCoord1 = worldPos2D / baseScale;
-    const float2 gridCoord10 = worldPos2D / (baseScale * 10.0);
-    const float grid1 = PristineGridLine(gridCoord1);
-    const float grid10 = PristineGridLine(gridCoord10);
-    const float2 deriv1 = fwidth(gridCoord1);
-    const float lodFactor = smoothstep(0.3, 0.6, max(deriv1.x, deriv1.y));
-
-    layer.major = max(grid10, grid1 * 0.35);
-    layer.minor = grid1 * (1.0 - lodFactor);
-    return layer;
-}
-
-struct PSOutput {
-    float4 color : SV_TARGET0;
-    float depth : SV_Depth;
-};
-
-PSOutput MainPS(VSOutput input) {
-    const float2 viewportSize = max(gViewportNearFar.xy, float2(1.0, 1.0));
-    const float scale = max(gCameraPositionAndScale.w, 1e-4);
-    const float fadeDistance = max(gCameraRightAndFade.w, scale * 10.0);
-    const float tanHalfFov = max(gCameraUpAndTanHalfFov.w, 1e-4);
-    const float aspect = max(gCameraForwardAndAspect.w, 1e-4);
-    const float transitionBlend = saturate(gGridTransition.x);
-    const float nearClip = gViewportNearFar.z;
-    const float sceneFarClip = gViewportNearFar.w;
-
-    const float2 ndc = float2(
-        (input.position.x / viewportSize.x) * 2.0 - 1.0,
-        1.0 - (input.position.y / viewportSize.y) * 2.0);
-
-    const float3 cameraPosition = gCameraPositionAndScale.xyz;
-    const float3 rayDirection = normalize(
-        gCameraForwardAndAspect.xyz +
-        ndc.x * aspect * tanHalfFov * gCameraRightAndFade.xyz +
-        ndc.y * tanHalfFov * gCameraUpAndTanHalfFov.xyz);
-
-    if (abs(rayDirection.y) < 1e-5) {
-        discard;
-    }
-
-    const float t = -cameraPosition.y / rayDirection.y;
-    if (t <= nearClip) {
-        discard;
-    }
-
-    const float3 worldPosition = cameraPosition + rayDirection * t;
-    float depth = 0.999999;
-    if (t < sceneFarClip) {
-        const float4 clipPosition = mul(gViewProjectionMatrix, float4(worldPosition, 1.0));
-        if (clipPosition.w <= 1e-6) {
-            discard;
-        }
-
-        depth = clipPosition.z / clipPosition.w;
-        if (depth <= 0.0 || depth >= 1.0) {
-            discard;
-        }
-    }
-
-    const float radialFade =
-        1.0 - smoothstep(fadeDistance * 0.3, fadeDistance, length(worldPosition - cameraPosition));
-    const float normalFade = smoothstep(0.0, 0.15, abs(rayDirection.y));
-    const float fadeFactor = radialFade * normalFade;
-    if (fadeFactor < 1e-3) {
-        discard;
-    }
-
-    const float2 worldPos2D = worldPosition.xz;
-    const GridLayer baseLayer = SampleGridLayer(worldPos2D, scale);
-    const GridLayer nextLayer = SampleGridLayer(worldPos2D, scale * 10.0);
-    const float minorGridIntensity = lerp(baseLayer.minor, nextLayer.minor, transitionBlend);
-    const float majorGridIntensity = lerp(baseLayer.major, nextLayer.major, transitionBlend);
-    float3 finalColor = float3(0.56, 0.56, 0.56);
-    float finalAlpha = max(
-        0.13 * minorGridIntensity * fadeFactor,
-        0.28 * majorGridIntensity * fadeFactor);
-
-    const float2 worldDeriv = max(fwidth(worldPos2D), float2(1e-6, 1e-6));
-    const float xAxisAlpha = AxisLineAA(worldPos2D.y, worldDeriv.y) * fadeFactor;
-    const float zAxisAlpha = AxisLineAA(worldPos2D.x, worldDeriv.x) * fadeFactor;
-
-    const float axisAlpha = max(xAxisAlpha, zAxisAlpha);
-    finalAlpha = max(finalAlpha, 0.34 * saturate(axisAlpha));
-
-    if (finalAlpha < 1e-3) {
-        discard;
-    }
-
-    PSOutput output;
-    output.color = float4(finalColor, finalAlpha);
-    output.depth = depth;
-    return output;
-}
-)";
-
 struct GridConstants {
     Math::Matrix4x4 viewProjection = Math::Matrix4x4::Identity();
     Math::Vector4 cameraPositionAndScale = Math::Vector4::Zero();
@@ -176,6 +34,23 @@ struct GridConstants {
     Math::Vector4 gridTransition = Math::Vector4::Zero();
 };
 
+const Resources::ShaderPass* FindInfiniteGridCompatiblePass(
+    const Resources::Shader& shader,
+    Resources::ShaderBackend backend) {
+    const Resources::ShaderPass* gridPass = shader.FindPass("InfiniteGrid");
+    if (gridPass != nullptr &&
+        ::XCEngine::Rendering::Detail::ShaderPassHasGraphicsVariants(shader, gridPass->name, backend)) {
+        return gridPass;
+    }
+
+    if (shader.GetPassCount() > 0 &&
+        ::XCEngine::Rendering::Detail::ShaderPassHasGraphicsVariants(shader, shader.GetPasses()[0].name, backend)) {
+        return &shader.GetPasses()[0];
+    }
+
+    return nullptr;
+}
+
 float SnapGridSpacing(float targetSpacing) {
     const float clampedTarget = (std::max)(targetSpacing, 0.02f);
     const float exponent = std::floor(std::log10(clampedTarget));
@@ -370,6 +245,26 @@ bool BuiltinInfiniteGridPass::CreateResources(const RenderContext& renderContext
 
     m_device = renderContext.device;
     m_backendType = renderContext.backendType;
+    m_builtinInfiniteGridShader = Resources::ResourceManager::Get().Load<Resources::Shader>(
+        Resources::GetBuiltinInfiniteGridShaderPath());
+    if (!m_builtinInfiniteGridShader.IsValid()) {
+        Debug::Logger::Get().Error(
+            Debug::LogCategory::Rendering,
+            "BuiltinInfiniteGridPass failed to load builtin infinite-grid shader resource");
+        DestroyResources();
+        return false;
+    }
+
+    const Resources::ShaderBackend backend = ::XCEngine::Rendering::Detail::ToShaderBackend(m_backendType);
+    const Resources::ShaderPass* infiniteGridPass =
+        FindInfiniteGridCompatiblePass(*m_builtinInfiniteGridShader.Get(), backend);
+    if (infiniteGridPass == nullptr) {
+        Debug::Logger::Get().Error(
+            Debug::LogCategory::Rendering,
+            "BuiltinInfiniteGridPass could not resolve a valid InfiniteGrid shader pass");
+        DestroyResources();
+        return false;
+    }
 
     RHI::DescriptorSetLayoutBinding constantBinding = {};
     constantBinding.binding = 0;
@@ -431,19 +326,18 @@ bool BuiltinInfiniteGridPass::CreateResources(const RenderContext& renderContext
     pipelineDesc.depthStencilState.depthWriteEnable = false;
     pipelineDesc.depthStencilState.depthFunc = static_cast<uint32_t>(RHI::ComparisonFunc::LessEqual);
 
-    pipelineDesc.vertexShader.source.assign(
-        kBuiltinInfiniteGridHlsl,
-        kBuiltinInfiniteGridHlsl + std::strlen(kBuiltinInfiniteGridHlsl));
-    pipelineDesc.vertexShader.sourceLanguage = RHI::ShaderLanguage::HLSL;
-    pipelineDesc.vertexShader.entryPoint = L"MainVS";
-    pipelineDesc.vertexShader.profile = L"vs_5_0";
-
-    pipelineDesc.fragmentShader.source.assign(
-        kBuiltinInfiniteGridHlsl,
-        kBuiltinInfiniteGridHlsl + std::strlen(kBuiltinInfiniteGridHlsl));
-    pipelineDesc.fragmentShader.sourceLanguage = RHI::ShaderLanguage::HLSL;
-    pipelineDesc.fragmentShader.entryPoint = L"MainPS";
-    pipelineDesc.fragmentShader.profile = L"ps_5_0";
+    if (const Resources::ShaderStageVariant* vertexVariant = m_builtinInfiniteGridShader->FindVariant(
+            infiniteGridPass->name,
+            Resources::ShaderType::Vertex,
+            backend)) {
+        ::XCEngine::Rendering::Detail::ApplyShaderStageVariant(*vertexVariant, pipelineDesc.vertexShader);
+    }
+    if (const Resources::ShaderStageVariant* fragmentVariant = m_builtinInfiniteGridShader->FindVariant(
+            infiniteGridPass->name,
+            Resources::ShaderType::Fragment,
+            backend)) {
+        ::XCEngine::Rendering::Detail::ApplyShaderStageVariant(*fragmentVariant, pipelineDesc.fragmentShader);
+    }
 
     m_pipelineState = m_device->CreatePipelineState(pipelineDesc);
     if (m_pipelineState == nullptr || !m_pipelineState->IsValid()) {
@@ -481,6 +375,7 @@ void BuiltinInfiniteGridPass::DestroyResources() {
 
     m_device = nullptr;
     m_backendType = RHI::RHIType::D3D12;
+    m_builtinInfiniteGridShader.Reset();
 }
 
 } // namespace Passes

engine/src/Resources/BuiltinResources.cpp

@@ -26,6 +26,7 @@ constexpr const char* kBuiltinTexturePrefix = "builtin://textures/";
 constexpr const char* kBuiltinDefaultPrimitiveMaterialPath = "builtin://materials/default-primitive";
 constexpr const char* kBuiltinForwardLitShaderPath = "builtin://shaders/forward-lit";
 constexpr const char* kBuiltinObjectIdShaderPath = "builtin://shaders/object-id";
+constexpr const char* kBuiltinInfiniteGridShaderPath = "builtin://shaders/infinite-grid";
 constexpr const char* kBuiltinDefaultPrimitiveTexturePath = "builtin://textures/default-primitive-albedo";
 constexpr float kPi = 3.14159265358979323846f;
 
@@ -308,6 +309,152 @@ void main() {
 }
 )";
 
+const char kBuiltinInfiniteGridHlsl[] = R"(
+cbuffer GridConstants : register(b0) {
+    float4x4 gViewProjectionMatrix;
+    float4 gCameraPositionAndScale;
+    float4 gCameraRightAndFade;
+    float4 gCameraUpAndTanHalfFov;
+    float4 gCameraForwardAndAspect;
+    float4 gViewportNearFar;
+    float4 gGridTransition;
+};
+
+struct VSOutput {
+    float4 position : SV_POSITION;
+};
+
+VSOutput MainVS(uint vertexId : SV_VertexID) {
+    static const float2 positions[3] = {
+        float2(-1.0, -1.0),
+        float2(-1.0,  3.0),
+        float2( 3.0, -1.0)
+    };
+
+    VSOutput output;
+    output.position = float4(positions[vertexId], 0.0, 1.0);
+    return output;
+}
+
+float PristineGridLine(float2 uv) {
+    float2 deriv = max(fwidth(uv), float2(1e-6, 1e-6));
+    float2 uvMod = frac(uv);
+    float2 uvDist = min(uvMod, 1.0 - uvMod);
+    float2 distInPixels = uvDist / deriv;
+    float2 lineAlpha = 1.0 - smoothstep(0.0, 1.0, distInPixels);
+    float density = max(deriv.x, deriv.y);
+    float densityFade = 1.0 - smoothstep(0.5, 1.0, density);
+    return max(lineAlpha.x, lineAlpha.y) * densityFade;
+}
+
+float AxisLineAA(float coord, float deriv) {
+    float distInPixels = abs(coord) / max(deriv, 1e-6);
+    return 1.0 - smoothstep(0.0, 1.5, distInPixels);
+}
+
+struct GridLayer {
+    float minor;
+    float major;
+};
+
+GridLayer SampleGridLayer(float2 worldPos2D, float baseScale) {
+    GridLayer layer;
+    const float2 gridCoord1 = worldPos2D / baseScale;
+    const float2 gridCoord10 = worldPos2D / (baseScale * 10.0);
+    const float grid1 = PristineGridLine(gridCoord1);
+    const float grid10 = PristineGridLine(gridCoord10);
+    const float2 deriv1 = fwidth(gridCoord1);
+    const float lodFactor = smoothstep(0.3, 0.6, max(deriv1.x, deriv1.y));
+
+    layer.major = max(grid10, grid1 * 0.35);
+    layer.minor = grid1 * (1.0 - lodFactor);
+    return layer;
+}
+
+struct PSOutput {
+    float4 color : SV_TARGET0;
+    float depth : SV_Depth;
+};
+
+PSOutput MainPS(VSOutput input) {
+    const float2 viewportSize = max(gViewportNearFar.xy, float2(1.0, 1.0));
+    const float scale = max(gCameraPositionAndScale.w, 1e-4);
+    const float fadeDistance = max(gCameraRightAndFade.w, scale * 10.0);
+    const float tanHalfFov = max(gCameraUpAndTanHalfFov.w, 1e-4);
+    const float aspect = max(gCameraForwardAndAspect.w, 1e-4);
+    const float transitionBlend = saturate(gGridTransition.x);
+    const float nearClip = gViewportNearFar.z;
+    const float sceneFarClip = gViewportNearFar.w;
+
+    const float2 ndc = float2(
+        (input.position.x / viewportSize.x) * 2.0 - 1.0,
+        1.0 - (input.position.y / viewportSize.y) * 2.0);
+
+    const float3 cameraPosition = gCameraPositionAndScale.xyz;
+    const float3 rayDirection = normalize(
+        gCameraForwardAndAspect.xyz +
+        ndc.x * aspect * tanHalfFov * gCameraRightAndFade.xyz +
+        ndc.y * tanHalfFov * gCameraUpAndTanHalfFov.xyz);
+
+    if (abs(rayDirection.y) < 1e-5) {
+        discard;
+    }
+
+    const float t = -cameraPosition.y / rayDirection.y;
+    if (t <= nearClip) {
+        discard;
+    }
+
+    const float3 worldPosition = cameraPosition + rayDirection * t;
+    float depth = 0.999999;
+    if (t < sceneFarClip) {
+        const float4 clipPosition = mul(gViewProjectionMatrix, float4(worldPosition, 1.0));
+        if (clipPosition.w <= 1e-6) {
+            discard;
+        }
+
+        depth = clipPosition.z / clipPosition.w;
+        if (depth <= 0.0 || depth >= 1.0) {
+            discard;
+        }
+    }
+
+    const float radialFade =
+        1.0 - smoothstep(fadeDistance * 0.3, fadeDistance, length(worldPosition - cameraPosition));
+    const float normalFade = smoothstep(0.0, 0.15, abs(rayDirection.y));
+    const float fadeFactor = radialFade * normalFade;
+    if (fadeFactor < 1e-3) {
+        discard;
+    }
+
+    const float2 worldPos2D = worldPosition.xz;
+    const GridLayer baseLayer = SampleGridLayer(worldPos2D, scale);
+    const GridLayer nextLayer = SampleGridLayer(worldPos2D, scale * 10.0);
+    const float minorGridIntensity = lerp(baseLayer.minor, nextLayer.minor, transitionBlend);
+    const float majorGridIntensity = lerp(baseLayer.major, nextLayer.major, transitionBlend);
+    float3 finalColor = float3(0.56, 0.56, 0.56);
+    float finalAlpha = max(
+        0.13 * minorGridIntensity * fadeFactor,
+        0.28 * majorGridIntensity * fadeFactor);
+
+    const float2 worldDeriv = max(fwidth(worldPos2D), float2(1e-6, 1e-6));
+    const float xAxisAlpha = AxisLineAA(worldPos2D.y, worldDeriv.y) * fadeFactor;
+    const float zAxisAlpha = AxisLineAA(worldPos2D.x, worldDeriv.x) * fadeFactor;
+
+    const float axisAlpha = max(xAxisAlpha, zAxisAlpha);
+    finalAlpha = max(finalAlpha, 0.34 * saturate(axisAlpha));
+
+    if (finalAlpha < 1e-3) {
+        discard;
+    }
+
+    PSOutput output;
+    output.color = float4(finalColor, finalAlpha);
+    output.depth = depth;
+    return output;
+}
+)";
+
 Math::Bounds ComputeBounds(const std::vector<StaticMeshVertex>& vertices) {
     if (vertices.empty()) {
         return Math::Bounds();
@@ -943,6 +1090,41 @@ Shader* BuildBuiltinObjectIdShader(const Containers::String& path) {
     return shader;
 }
 
+Shader* BuildBuiltinInfiniteGridShader(const Containers::String& path) {
+    auto* shader = new Shader();
+    IResource::ConstructParams params;
+    params.name = Containers::String("Builtin Infinite Grid");
+    params.path = path;
+    params.guid = ResourceGUID::Generate(path);
+    params.memorySize = 0;
+    shader->Initialize(params);
+
+    const Containers::String passName("InfiniteGrid");
+    shader->SetPassTag(passName, "LightMode", "InfiniteGrid");
+
+    AddBuiltinShaderStageVariant(
+        *shader,
+        passName,
+        ShaderType::Vertex,
+        ShaderLanguage::HLSL,
+        ShaderBackend::D3D12,
+        kBuiltinInfiniteGridHlsl,
+        "MainVS",
+        "vs_5_0");
+    AddBuiltinShaderStageVariant(
+        *shader,
+        passName,
+        ShaderType::Fragment,
+        ShaderLanguage::HLSL,
+        ShaderBackend::D3D12,
+        kBuiltinInfiniteGridHlsl,
+        "MainPS",
+        "ps_5_0");
+
+    shader->m_memorySize = CalculateBuiltinShaderMemorySize(*shader);
+    return shader;
+}
+
 Material* BuildDefaultPrimitiveMaterial(const Containers::String& path) {
     auto* material = new Material();
     IResource::ConstructParams params;
@@ -1049,6 +1231,10 @@ Containers::String GetBuiltinObjectIdShaderPath() {
     return Containers::String(kBuiltinObjectIdShaderPath);
 }
 
+Containers::String GetBuiltinInfiniteGridShaderPath() {
+    return Containers::String(kBuiltinInfiniteGridShaderPath);
+}
+
 Containers::String GetBuiltinDefaultPrimitiveTexturePath() {
     return Containers::String(kBuiltinDefaultPrimitiveTexturePath);
 }
@@ -1141,6 +1327,8 @@ LoadResult CreateBuiltinShaderResource(const Containers::String& path) {
         shader = BuildBuiltinForwardLitShader(path);
     } else if (path == GetBuiltinObjectIdShaderPath()) {
         shader = BuildBuiltinObjectIdShader(path);
+    } else if (path == GetBuiltinInfiniteGridShaderPath()) {
+        shader = BuildBuiltinInfiniteGridShader(path);
     } else {
         return LoadResult(Containers::String("Unknown builtin shader: ") + path);
     }

tests/Resources/Shader/test_shader_loader.cpp

@@ -33,6 +33,7 @@ TEST(ShaderLoader, CanLoad) {
     EXPECT_TRUE(loader.CanLoad("test.hlsl"));
     EXPECT_TRUE(loader.CanLoad(GetBuiltinForwardLitShaderPath()));
     EXPECT_TRUE(loader.CanLoad(GetBuiltinObjectIdShaderPath()));
+    EXPECT_TRUE(loader.CanLoad(GetBuiltinInfiniteGridShaderPath()));
     EXPECT_FALSE(loader.CanLoad("test.txt"));
     EXPECT_FALSE(loader.CanLoad("test.png"));
 }
@@ -128,6 +129,31 @@ TEST(ShaderLoader, LoadBuiltinObjectIdShaderBuildsBackendVariants) {
     delete shader;
 }
 
+TEST(ShaderLoader, LoadBuiltinInfiniteGridShaderBuildsD3D12Variants) {
+    ShaderLoader loader;
+    LoadResult result = loader.Load(GetBuiltinInfiniteGridShaderPath());
+    ASSERT_TRUE(result);
+    ASSERT_NE(result.resource, nullptr);
+
+    Shader* shader = static_cast<Shader*>(result.resource);
+    ASSERT_NE(shader, nullptr);
+    ASSERT_TRUE(shader->IsValid());
+
+    const ShaderPass* pass = shader->FindPass("InfiniteGrid");
+    ASSERT_NE(pass, nullptr);
+    ASSERT_EQ(pass->variants.Size(), 2u);
+    ASSERT_EQ(pass->tags.Size(), 1u);
+    EXPECT_EQ(pass->tags[0].name, "LightMode");
+    EXPECT_EQ(pass->tags[0].value, "InfiniteGrid");
+
+    EXPECT_NE(shader->FindVariant("InfiniteGrid", ShaderType::Vertex, ShaderBackend::D3D12), nullptr);
+    EXPECT_NE(shader->FindVariant("InfiniteGrid", ShaderType::Fragment, ShaderBackend::D3D12), nullptr);
+    EXPECT_EQ(shader->FindVariant("InfiniteGrid", ShaderType::Vertex, ShaderBackend::OpenGL), nullptr);
+    EXPECT_EQ(shader->FindVariant("InfiniteGrid", ShaderType::Fragment, ShaderBackend::OpenGL), nullptr);
+
+    delete shader;
+}
+
 TEST(ShaderLoader, ResourceManagerLazilyLoadsBuiltinForwardLitShader) {
     ResourceManager& manager = ResourceManager::Get();
     manager.Shutdown();
@@ -141,6 +167,10 @@ TEST(ShaderLoader, ResourceManagerLazilyLoadsBuiltinForwardLitShader) {
     ASSERT_TRUE(objectIdShaderHandle.IsValid());
     ASSERT_NE(objectIdShaderHandle->FindPass("ObjectId"), nullptr);
 
+    ResourceHandle<Shader> infiniteGridShaderHandle = manager.Load<Shader>(GetBuiltinInfiniteGridShaderPath());
+    ASSERT_TRUE(infiniteGridShaderHandle.IsValid());
+    ASSERT_NE(infiniteGridShaderHandle->FindPass("InfiniteGrid"), nullptr);
+
     manager.Shutdown();
 }