refactor: generalize renderer builtin post process

tests/Rendering/unit/test_builtin_post_process_pass_plan.cpp

@@ -0,0 +1,143 @@
+#include <gtest/gtest.h>
+
+#include <XCEngine/Rendering/Passes/BuiltinPostProcessPassPlan.h>
+
+#include <vector>
+
+namespace {
+
+using XCEngine::Rendering::Passes::BuildBuiltinPostProcessPassPlan;
+using XCEngine::Rendering::Passes::BuiltinPostProcessPassPlanInput;
+using XCEngine::Rendering::Passes::BuiltinPostProcessPassStep;
+
+TEST(BuiltinPostProcessPassPlan_Test, ReturnsInvalidPlanWhenNoBuiltinEffectIsAvailable) {
+    const auto plan = BuildBuiltinPostProcessPassPlan({});
+
+    EXPECT_FALSE(plan.valid);
+    EXPECT_TRUE(plan.steps.empty());
+}
+
+TEST(BuiltinPostProcessPassPlan_Test, BuildsGridOnlyPlanWhenNothingIsSelected) {
+    BuiltinPostProcessPassPlanInput input = {};
+    input.hasGridOverlay = true;
+
+    const auto plan = BuildBuiltinPostProcessPassPlan(input);
+
+    ASSERT_TRUE(plan.valid);
+    EXPECT_EQ(
+        plan.steps,
+        (std::vector<BuiltinPostProcessPassStep>{
+            BuiltinPostProcessPassStep::ColorToRenderTarget,
+            BuiltinPostProcessPassStep::InfiniteGrid,
+            BuiltinPostProcessPassStep::ColorToShaderResource
+        }));
+}
+
+TEST(BuiltinPostProcessPassPlan_Test, BuildsGridAndSelectionOutlinePlanWhenObjectIdShaderViewExists) {
+    BuiltinPostProcessPassPlanInput input = {};
+    input.hasGridOverlay = true;
+    input.hasSelection = true;
+    input.hasObjectIdShaderView = true;
+
+    const auto plan = BuildBuiltinPostProcessPassPlan(input);
+
+    ASSERT_TRUE(plan.valid);
+    EXPECT_EQ(
+        plan.steps,
+        (std::vector<BuiltinPostProcessPassStep>{
+            BuiltinPostProcessPassStep::ColorToRenderTarget,
+            BuiltinPostProcessPassStep::InfiniteGrid,
+            BuiltinPostProcessPassStep::SelectionOutline,
+            BuiltinPostProcessPassStep::ColorToShaderResource
+        }));
+}
+
+TEST(BuiltinPostProcessPassPlan_Test, SkipsSelectionOutlineWhenObjectIdShaderViewIsMissingAndGridExists) {
+    BuiltinPostProcessPassPlanInput input = {};
+    input.hasGridOverlay = true;
+    input.hasSelection = true;
+
+    const auto plan = BuildBuiltinPostProcessPassPlan(input);
+
+    ASSERT_TRUE(plan.valid);
+    EXPECT_EQ(
+        plan.steps,
+        (std::vector<BuiltinPostProcessPassStep>{
+            BuiltinPostProcessPassStep::ColorToRenderTarget,
+            BuiltinPostProcessPassStep::InfiniteGrid,
+            BuiltinPostProcessPassStep::ColorToShaderResource
+        }));
+}
+
+TEST(BuiltinPostProcessPassPlan_Test, BuildsDebugMaskPlanFromObjectIdShaderView) {
+    BuiltinPostProcessPassPlanInput input = {};
+    input.hasGridOverlay = true;
+    input.hasSelection = true;
+    input.debugSelectionMask = true;
+    input.hasObjectIdShaderView = true;
+
+    const auto plan = BuildBuiltinPostProcessPassPlan(input);
+
+    ASSERT_TRUE(plan.valid);
+    EXPECT_EQ(
+        plan.steps,
+        (std::vector<BuiltinPostProcessPassStep>{
+            BuiltinPostProcessPassStep::ColorToRenderTarget,
+            BuiltinPostProcessPassStep::SelectionMaskDebug,
+            BuiltinPostProcessPassStep::ColorToShaderResource
+        }));
+}
+
+TEST(BuiltinPostProcessPassPlan_Test, DebugMaskPlanFallsBackToTransitionsWhenGridExistsButObjectIdShaderViewIsMissing) {
+    BuiltinPostProcessPassPlanInput input = {};
+    input.hasGridOverlay = true;
+    input.hasSelection = true;
+    input.debugSelectionMask = true;
+
+    const auto plan = BuildBuiltinPostProcessPassPlan(input);
+
+    ASSERT_TRUE(plan.valid);
+    EXPECT_EQ(
+        plan.steps,
+        (std::vector<BuiltinPostProcessPassStep>{
+            BuiltinPostProcessPassStep::ColorToRenderTarget,
+            BuiltinPostProcessPassStep::ColorToShaderResource
+        }));
+}
+
+TEST(BuiltinPostProcessPassPlan_Test, BuildsSelectionOnlyOutlinePlanWhenGridOverlayIsUnavailable) {
+    BuiltinPostProcessPassPlanInput input = {};
+    input.hasSelection = true;
+    input.hasObjectIdShaderView = true;
+
+    const auto plan = BuildBuiltinPostProcessPassPlan(input);
+
+    ASSERT_TRUE(plan.valid);
+    EXPECT_EQ(
+        plan.steps,
+        (std::vector<BuiltinPostProcessPassStep>{
+            BuiltinPostProcessPassStep::ColorToRenderTarget,
+            BuiltinPostProcessPassStep::SelectionOutline,
+            BuiltinPostProcessPassStep::ColorToShaderResource
+        }));
+}
+
+TEST(BuiltinPostProcessPassPlan_Test, BuildsDebugMaskWithoutGridWhenObjectIdShaderViewExists) {
+    BuiltinPostProcessPassPlanInput input = {};
+    input.hasSelection = true;
+    input.debugSelectionMask = true;
+    input.hasObjectIdShaderView = true;
+
+    const auto plan = BuildBuiltinPostProcessPassPlan(input);
+
+    ASSERT_TRUE(plan.valid);
+    EXPECT_EQ(
+        plan.steps,
+        (std::vector<BuiltinPostProcessPassStep>{
+            BuiltinPostProcessPassStep::ColorToRenderTarget,
+            BuiltinPostProcessPassStep::SelectionMaskDebug,
+            BuiltinPostProcessPassStep::ColorToShaderResource
+        }));
+}
+
+} // namespace