UnitTests/Shader: Add cond/const if tests

tests/Engine/Shader/Const.cpp

@@ -0,0 +1,112 @@
+#include <Engine/Shader/ShaderUtils.hpp>
+#include <Nazara/Core/File.hpp>
+#include <Nazara/Core/StringExt.hpp>
+#include <Nazara/Shader/ShaderBuilder.hpp>
+#include <Nazara/Shader/ShaderLangParser.hpp>
+#include <Nazara/Shader/Ast/AstOptimizer.hpp>
+#include <Nazara/Shader/Ast/SanitizeVisitor.hpp>
+#include <catch2/catch.hpp>
+#include <cctype>
+
+void ExpectOutput(Nz::ShaderAst::Statement& shader, const Nz::ShaderAst::SanitizeVisitor::Options& options, std::string_view expectedOptimizedResult)
+{
+	Nz::ShaderAst::StatementPtr sanitizedShader;
+	REQUIRE_NOTHROW(sanitizedShader = Nz::ShaderAst::Sanitize(shader, options));
+
+	ExpectNZSL(*sanitizedShader, expectedOptimizedResult);
+}
+
+TEST_CASE("const", "[Shader]")
+{
+	WHEN("using const if")
+	{
+		std::string_view sourceCode = R"(
+option UseInt: bool = false;
+
+[cond(UseInt)]
+struct inputStruct
+{
+	value: i32
+}
+
+[cond(!UseInt)]
+struct inputStruct
+{
+	value: f32
+}
+
+external
+{
+	[set(0), binding(0)] data: uniform<inputStruct>
+}
+
+[entry(frag)]
+fn main()
+{
+	let value: f32;
+
+	const if (UseInt)
+	{
+		value = f32(data.value);
+	}
+	else
+	{
+		value = data.value;
+	}
+}
+)";
+
+		Nz::ShaderAst::StatementPtr shader;
+		REQUIRE_NOTHROW(shader = Nz::ShaderLang::Parse(sourceCode));
+
+		Nz::ShaderAst::SanitizeVisitor::Options options;
+
+		WHEN("Enabling option")
+		{
+			options.optionValues[0] = true;
+
+			ExpectOutput(*shader, options, R"(
+struct inputStruct
+{
+	value: i32
+}
+
+external
+{
+	[set(0), binding(0)] data: uniform<inputStruct>
+}
+
+[entry(frag)]
+fn main()
+{
+	let value: f32;
+	value = f32(data.value);
+}
+)");
+		}
+
+		WHEN("Disabling option")
+		{
+			options.optionValues[0] = false;
+
+			ExpectOutput(*shader, options, R"(
+struct inputStruct
+{
+	value: f32
+}
+
+external
+{
+	[set(0), binding(0)] data: uniform<inputStruct>
+}
+
+[entry(frag)]
+fn main()
+{
+	let value: f32;
+	value = data.value;
+}
+)");
+		}
+	}
+}