media/options: refactor cvar factory completely, ensure correct MIN/MAX order

src/media/options.cpp

@@ -9,7 +9,7 @@
 
 #include <cstddef>
 #include <cstdint>
-#include <vector>
+#include <type_traits>
 
 #include <fmt/format.h>
 
@@ -49,60 +49,56 @@ float Options::get<float>(const char* option) const
 	return FixedToFloat(cvar(option).value);
 }
 
-static consvar_t range_cvar(const char* default_value, int32_t min, int32_t max, int32_t flags = 0)
+template <typename T>
+consvar_t Options::values(const char* default_value, const Range<T> range, std::map<std::string_view, T> list)
 {
-	return CVAR_INIT(
-		nullptr,
-		default_value,
-		CV_SAVE | flags,
-		new CV_PossibleValue_t[] {{min, "MIN"}, {max, "MAX"}, {}},
-		nullptr
-	);
-}
+	constexpr bool is_float = std::is_floating_point_v<T>;
 
-template <>
-consvar_t Options::range<float>(const char* default_value, float min, float max)
-{
-	return range_cvar(default_value, FloatToFixed(min), FloatToFixed(max), CV_FLOAT);
-}
+	const std::size_t min_max_size = (range.min || range.max) ? 2 : 0;
+	auto* arr = new CV_PossibleValue_t[list.size() + min_max_size + 1];
 
-template <>
-consvar_t Options::range_min<float>(const char* default_value, float min)
-{
-	return range_cvar(default_value, FloatToFixed(min), INT32_MAX);
-}
-
-template <>
-consvar_t Options::range<int>(const char* default_value, int min, int max)
-{
-	return range_cvar(default_value, min, max);
-}
-
-template <>
-consvar_t Options::range_min<int>(const char* default_value, int min)
-{
-	return range_cvar(default_value, min, INT32_MAX);
-}
-
-template <>
-consvar_t Options::value_map<int>(const char* default_value, std::map<const char*, int> values)
-{
-	auto* arr = new CV_PossibleValue_t[values.size() + 1];
-
-	std::size_t i = 0;
-
-	for (const auto& [k, v] : values)
+	auto cast = [is_float](T n)
 	{
-		arr[i].value = v;
-		arr[i].strvalue = k;
+		if constexpr (is_float)
+		{
+			return FloatToFixed(n);
+		}
+		else
+		{
+			return n;
+		}
+	};
 
-		i++;
+	if (min_max_size)
+	{
+		// Order is very important, MIN then MAX.
+		arr[0] = {range.min ? cast(*range.min) : INT32_MIN, "MIN"};
+		arr[1] = {range.max ? cast(*range.max) : INT32_MAX, "MAX"};
 	}
 
-	arr[i].value = 0;
-	arr[i].strvalue = nullptr;
+	{
+		std::size_t i = min_max_size;
 
-	return CVAR_INIT(nullptr, default_value, CV_SAVE, arr, nullptr);
+		for (const auto& [k, v] : list)
+		{
+			arr[i].value = cast(v);
+			arr[i].strvalue = k.data();
+
+			i++;
+		}
+
+		arr[i].value = 0;
+		arr[i].strvalue = nullptr;
+	}
+
+	int32_t flags = CV_SAVE;
+
+	if constexpr (is_float)
+	{
+		flags |= CV_FLOAT;
+	}
+
+	return CVAR_INIT(nullptr, default_value, flags, arr, nullptr);
 }
 
 void Options::register_all()
@@ -114,3 +110,8 @@ void Options::register_all()
 
 	cvars_ = {};
 }
+
+// clang-format off
+template consvar_t Options::values(const char* default_value, const Range<int> range, std::map<std::string_view, int> list);
+template consvar_t Options::values(const char* default_value, const Range<float> range, std::map<std::string_view, float> list);
+// clang-format on

src/media/options.hpp

@@ -11,7 +11,9 @@
 #define __SRB2_MEDIA_OPTIONS_HPP__
 
 #include <map>
+#include <optional>
 #include <string>
+#include <string_view>
 #include <unordered_map>
 #include <vector>
 
@@ -25,6 +27,12 @@ class Options
 public:
 	using map_t = std::unordered_map<std::string, consvar_t>;
 
+	template <typename T>
+	struct Range
+	{
+		std::optional<T> min, max;
+	};
+
 	// Registers all options as cvars.
 	static void register_all();
 
@@ -34,13 +42,7 @@ public:
 	T get(const char* option) const;
 
 	template <typename T>
-	static consvar_t range(const char* default_value, T min, T max);
-
-	template <typename T>
-	static consvar_t range_min(const char* default_value, T min);
-
-	template <typename T>
-	static consvar_t value_map(const char* default_value, std::map<const char*, T> values);
+	static consvar_t values(const char* default_value, const Range<T> range, std::map<std::string_view, T> list = {});
 
 private:
 	static std::vector<consvar_t*> cvars_;

src/media/options_values.cpp

@@ -26,37 +26,33 @@ std::vector<consvar_t*> Options::cvars_;
 
 // clang-format off
 const Options VorbisEncoder::options_("vorbis", {
-	{"quality",			Options::range<float>("0", -0.1f, 1.f)},
-	{"max_bitrate",		Options::range_min<int>("-1", -1)},
-	{"nominal_bitrate",	Options::range_min<int>("-1", -1)},
-	{"min_bitrate",		Options::range_min<int>("-1", -1)},
+	{"quality",			Options::values<float>("0", {-0.1f, 1.f})},
+	{"max_bitrate",		Options::values<int>("-1", {.min = -1})},
+	{"nominal_bitrate",	Options::values<int>("-1", {.min = -1})},
+	{"min_bitrate",		Options::values<int>("-1", {.min = -1})},
 });
 
 const Options VP8Encoder::options_("vp8", {
-	{"quality_mode", Options::value_map<int>("q", {
+	{"quality_mode", Options::values<int>("q", {}, {
 		{"vbr", VPX_VBR},
 		{"cbr", VPX_CBR},
 		{"cq", VPX_CQ},
 		{"q", VPX_Q},
 	})},
-	{"target_bitrate", Options::range_min<int>("800", 1)},
-	{"min_q", Options::range<int>("4", 4, 63)},
-	{"max_q", Options::range<int>("55", 4, 63)},
-	{"kf_min", Options::range_min<int>("0", 0)},
-	{"kf_max", Options::value_map<int>("auto", {
+	{"target_bitrate", Options::values<int>("800", {.min = 1})},
+	{"min_q", Options::values<int>("4", {4, 63})},
+	{"max_q", Options::values<int>("55", {4, 63})},
+	{"kf_min", Options::values<int>("0", {.min = 0})},
+	{"kf_max", Options::values<int>("auto", {.min = 0}, {
 		{"auto", static_cast<int>(KeyFrameOption::kAuto)},
-		{"MIN", 0},
-		{"MAX", INT32_MAX},
 	})},
-	{"cpu_used", Options::range<int>("0", -16, 16)},
-	{"cq_level", Options::range<int>("10", 0, 63)},
-	{"deadline", Options::value_map<int>("10", {
+	{"cpu_used", Options::values<int>("0", {-16, 16})},
+	{"cq_level", Options::values<int>("10", {0, 63})},
+	{"deadline", Options::values<int>("10", { .min = 1}, {
 		{"infinite", static_cast<int>(DeadlineOption::kInfinite)},
-		{"MIN", 1},
-		{"MAX", INT32_MAX},
 	})},
-	{"sharpness", Options::range<int>("7", 0, 7)},
-	{"token_parts", Options::range<int>("0", 0, 3)},
-	{"threads", Options::range_min<int>("1", 1)},
+	{"sharpness", Options::values<int>("7", {0, 7})},
+	{"token_parts", Options::values<int>("0", {0, 3})},
+	{"threads", Options::values<int>("1", {.min = 1})},
 });
 // clang-format on