Initial Cross Platform Work

backends/desktop/include/li_backend_gl2.hpp

@@ -0,0 +1,46 @@
+#include <glad/glad.h>
+
+/** SEPARATOR */
+#include <GLFW/glfw3.h>
+/** SEPARATOR */
+#include <pd/core/core.hpp>
+#include <pd/lithium/backend.hpp>
+#include <pd_p_bknd_api.hpp>
+
+namespace PD {
+namespace LI {
+class PD_BKND_DESKTOP_API Backend_GL2 : public PD::LI::Backend {
+ public:
+  Backend_GL2() : LI::Backend("OpenGL2") {}
+  ~Backend_GL2() {}
+
+  PD_SMART_CTOR(Backend_GL2)
+
+  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:
+  PD::Vec<PD::LI::Vertex> VertexBuffer;
+  PD::Vec<PD::u16> IndexBuffer;
+  size_t CurrentVertex = 0;
+  size_t CurrentIndex = 0;
+  GLuint Shader;
+  GLuint pLocProjection;
+  GLuint pLocTex;
+  Mat4 Projection;
+  GLuint VBO, IBO;
+  // For Stats
+  PD::u32 num_vtx = 0;
+  PD::u32 num_idx = 0;
+};
+
+}  // namespace LI
+}  // namespace PD