palladium/include/pd/drivers/gfx.hpp

#pragma once

/*
MIT License
Copyright (c) 2024 - 2025 René Amthor (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/texture.hpp>

using LiBackendFlags = PD::u32;
enum LiBackendFlags_ {
  LiBackendFlags_None = 0,
  LiBackendFlags_FlipUV_Y = PD_BIT(0),  // Essential for font loading
};

namespace PD {
class GfxDriver {
 public:
  GfxDriver(const std::string& name = "NullGfx") : pName(name) {};
  ~GfxDriver() = default;

  PD_SHARED(GfxDriver);

  void PostInit();

  virtual void Init() {}
  virtual void Deinit() {}
  virtual void NewFrame() {}

  virtual void BindTex(Li::TexAddress addr) {}

  virtual void RenderDrawData(const std::vector<Li::Command::Ref>& Commands) {}

  void SetViewPort(const ivec2& vp) { ViewPort = vp; }

  virtual Li::Texture::Ref LoadTex(
      const std::vector<u8>& pixels, int w, int h,
      Li::Texture::Type type = Li::Texture::Type::RGBA32,
      Li::Texture::Filter filter = Li::Texture::Filter::LINEAR) {
    // Texture loading not supported (when this func not get override)
    return nullptr;
  }

  Li::Texture::Ref GetSolidTex() { return pSolid; }

  const std::string pName = "NullGfx";
  LiBackendFlags Flags = 0;
  ivec2 ViewPort;
  Mat4 Projection;
  Li::Texture::Ref pSolid;
  size_t CurrentVertex = 0;
  size_t CurrentIndex = 0;

  /** Debug Variables */

  // Optional Index counter
  u32 IndexCounter;
  // Optional Vertex counter
  u32 VertexCounter;
  // Optional Frame Counter
  u64 FrameCounter;
};

/** Static Gfx Controller */
class Gfx {
 public:
  Gfx() = default;
  ~Gfx() = default;

  static void Init(GfxDriver::Ref d);

  static void Deinit() { pGfx->Deinit(); }
  static void NewFrame() { pGfx->NewFrame(); }

  static void BindTex(Li::TexAddress addr) { pGfx->BindTex(addr); }
  static void SetViewPort(const ivec2& vp) { pGfx->SetViewPort(vp); }

  static void RenderDrawData(const std::vector<Li::Command::Ref>& Commands) {
    pGfx->RenderDrawData(Commands);
  }

  static LiBackendFlags Flags() { return pGfx->Flags; }
  static Li::Texture::Ref LoadTex(
      const std::vector<u8>& pixels, int w, int h,
      Li::Texture::Type type = Li::Texture::Type::RGBA32,
      Li::Texture::Filter filter = Li::Texture::Filter::LINEAR) {
    return pGfx->LoadTex(pixels, w, h, type, filter);
  }

  static Li::Texture::Ref GetSolidTex() { return pGfx->GetSolidTex(); }

  static GfxDriver::Ref pGfx;
};
}  // namespace PD