Add backends

- Renamed GfxOpenGL to GfxOPenGL2
- Added GfxOpenGL3 backend for OpenGL 3.3+
- Added WIP DirectX9 backend
- Added structure for Citro3D
- Added linear Allocator

include/pd/drivers/formatters.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <pd/drivers/gfx.hpp>
+
+template <>
+struct std::formatter<PD::TextureFilter> {
+  constexpr auto parse(std::format_parse_context& ctx) { return ctx.begin(); }
+
+  template <typename FormatContext>
+  auto format(const PD::TextureFilter& value, FormatContext& ctx) const {
+    std::string_view ret = "Unknown";
+    switch (value) {
+      case PD::TextureFilter::Linear:
+        ret = "Linear";
+        break;
+      case PD::TextureFilter::Nearest:
+        ret = "Nearest";
+        break;
+    }
+    return std::format_to(ctx.out(), "{}", ret);
+  }
+};
+
+template <>
+struct std::formatter<PD::TextureFormat> {
+  constexpr auto parse(std::format_parse_context& ctx) { return ctx.begin(); }
+
+  template <typename FormatContext>
+  auto format(const PD::TextureFormat& value, FormatContext& ctx) const {
+    std::string_view ret = "Unknown";
+    switch (value) {
+      case PD::TextureFormat::RGBA32:
+        ret = "RGBA32";
+        break;
+      case PD::TextureFormat::RGB24:
+        ret = "RGB24";
+        break;
+      case PD::TextureFormat::A8:
+        ret = "A8";
+        break;
+    }
+    return std::format_to(ctx.out(), "{}", ret);
+  }
+};