Initial Cross Platform Work

include/pd/lithium/backend.hpp

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+#pragma once
+
+/*
+MIT License
+
+Copyright (c) 2024 - 2025 tobid7
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+
+#include <pd/core/core.hpp>
+#include <pd/lithium/command.hpp>
+#include <pd/lithium/rect.hpp>
+#include <pd/lithium/texture.hpp>
+
+using LIBackendFlags = PD::u32;
+enum LIBackendFlags_ {
+  LIBackendFlags_None = 0,
+  LIBackendFlags_FlipUV_Y = 1 << 0,  // Essential for Font Loading
+};
+
+namespace PD {
+namespace LI {
+class Backend {
+ public:
+  Backend(const std::string& name = "NullBackend") : pName(name) {}
+  ~Backend() = default;
+  // Using Legacy SmartCTOR API here
+  PD_SMART_CTOR(Backend)
+
+  virtual void Init() {}
+  virtual void Deinit() {}
+  virtual void NewFrame() {}
+
+  virtual void BindTexture(TexAddress addr) {}
+
+  virtual void RenderDrawData(const Vec<Command::Ref>& Commands) {}
+
+  virtual Texture::Ref LoadTexture(
+      const std::vector<PD::u8>& pixels, int w, int h,
+      Texture::Type type = Texture::Type::RGBA32,
+      Texture::Filter filter = Texture::Filter::LINEAR) {
+    // Texture loading not supported (when this func not get override)
+    return nullptr;
+  }
+
+  /** Backend identification name */
+  const std::string pName = "NullBackend";
+  LIBackendFlags Flags = 0;
+  ivec2 ViewPort;
+  fvec4 ClearColor;
+  // Optional Index Counter
+  int IndexCounter = 0;
+  // Optional Vertex Counter
+  int VertexCounter = 0;
+  // Optional Frame Counter
+  int FrameCounter = 0;
+};
+}  // namespace LI
+}  // namespace PD