UnitTests: Add a lot of shader generation tests

tests/Engine/Shader/Loops.cpp

@@ -0,0 +1,90 @@
+#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("loops", "[Shader]")
+{
+	std::string_view nzslSource = R"(
+struct inputStruct
+{
+	value: f32
+}
+
+external
+{
+	[set(0), binding(0)] data: uniform<inputStruct>
+}
+
+[entry(frag)]
+fn main()
+{
+	let value = 0.0;
+	let i = 0;
+	while (i < 10)
+	{
+		value += 0.1;
+		i += 1;
+	}
+}
+)";
+
+	Nz::ShaderAst::StatementPtr shader = Nz::ShaderLang::Parse(nzslSource);
+
+	ExpectGLSL(*shader, R"(
+void main()
+{
+	float value = 0.000000;
+	int i = 0;
+	while (i < (10))
+	{
+		value += 0.100000;
+		i += 1;
+	}
+	
+}
+)");
+
+	ExpectNZSL(*shader, R"(
+[entry(frag)]
+fn main()
+{
+	let value: f32 = 0.000000;
+	let i: i32 = 0;
+	while (i < (10))
+	{
+		value += 0.100000;
+		i += 1;
+	}
+	
+}
+)");
+
+	ExpectSpirV(*shader, R"(
+OpFunction
+OpLabel
+OpVariable
+OpVariable
+OpStore
+OpStore
+OpBranch
+OpLabel
+OpLoad
+OpSLessThan
+OpLoopMerge
+OpBranchConditional
+OpLabel
+OpLoad
+OpFAdd
+OpStore
+OpLoad
+OpIAdd
+OpStore
+OpBranch
+OpLabel
+OpReturn
+OpFunctionEnd)");
+}