UnitTests: Add a lot of shader generation tests

tests/Engine/Shader/Branch.cpp

@@ -0,0 +1,86 @@
+#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 <catch2/catch.hpp>
+#include <cctype>
+
+TEST_CASE("branching", "[Shader]")
+{
+	std::string_view nzslSource = R"(
+struct inputStruct
+{
+	value: f32
+}
+
+external
+{
+	[set(0), binding(0)] data: uniform<inputStruct>
+}
+
+[entry(frag)]
+fn main()
+{
+	let value: f32;
+	if (data.value > 0.0)
+		value = 1.0;
+	else
+		value = 0.0;
+}
+)";
+
+	Nz::ShaderAst::StatementPtr shader = Nz::ShaderLang::Parse(nzslSource);
+
+	ExpectGLSL(*shader, R"(
+void main()
+{
+	float value;
+	if (data.value > (0.000000))
+	{
+		value = 1.000000;
+	}
+	else
+	{
+		value = 0.000000;
+	}
+	
+}
+)");
+
+	ExpectNZSL(*shader, R"(
+[entry(frag)]
+fn main()
+{
+	let value: f32;
+	if (data.value > (0.000000))
+	{
+		value = 1.000000;
+	}
+	else
+	{
+		value = 0.000000;
+	}
+	
+}
+)");
+
+	ExpectSpirV(*shader, R"(
+OpFunction
+OpLabel
+OpVariable
+OpAccessChain
+OpLoad
+OpFOrdGreaterThanEqual
+OpSelectionMerge
+OpBranchConditional
+OpLabel
+OpStore
+OpBranch
+OpLabel
+OpStore
+OpBranch
+OpLabel
+OpReturn
+OpFunctionEnd)");
+}