Initial Cross Platform Work

backends/3ds/include/li_backend_c3d.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.
+*/
+
+#pragma once
+
+#include <3ds.h>
+#include <citro3d.h>
+
+#include <pd/core/core.hpp>
+#include <pd/lithium/backend.hpp>
+
+namespace PD {
+template <typename T>
+class LinearAlloc : public Allocator<T> {
+ public:
+  LinearAlloc() = default;
+  ~LinearAlloc() = default;
+
+  T* Allocate(size_t n) override { return (T*)linearAlloc(n); }
+  void Deallocate(T* ptr) { linearFree(ptr); }
+};
+namespace LI {
+class Backend_C3D : public PD::LI::Backend {
+ public:
+  Backend_C3D() : LI::Backend("Citro3D") {}
+  ~Backend_C3D() {}
+  PD_SMART_CTOR(Backend_C3D)
+
+  void Init() override;
+
+  void Deinit() override;
+
+  void NewFrame() override;
+
+  void BindTexture(PD::LI::TexAddress addr) override;
+
+  void RenderDrawData(const PD::Vec<PD::LI::Command::Ref>& Commands) override;
+
+  PD::LI::Texture::Ref LoadTexture(
+      const std::vector<PD::u8>& pixels, int w, int h,
+      PD::LI::Texture::Type type = PD::LI::Texture::Type::RGBA32,
+      PD::LI::Texture::Filter filter =
+          PD::LI::Texture::Filter::LINEAR) override;
+
+ private:
+  Vec<Vertex, LinearAlloc<Vertex>> VertexBuffer;
+  Vec<u16, LinearAlloc<u16>> IndexBuffer;
+  size_t CurrentVertex = 0;
+  size_t CurrentIndex = 0;
+  Mat4 Projection;
+  int pLocProjection = 0;
+  DVLB_s* ShaderCode;
+  shaderProgram_s Shader;
+  C3D_AttrInfo ShaderInfo;
+  // For Stats
+  PD::u32 num_vtx = 0;
+  PD::u32 num_idx = 0;
+};
+}  // namespace LI
+}  // namespace PD