Lower final color into final output stage

tests/Rendering/unit/test_builtin_forward_pipeline.cpp

@@ -211,6 +211,53 @@ TEST(BuiltinForwardPipeline_Test, BuiltinSkyboxShaderDeclaresExplicitEnvironment
     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());