#ifndef GL_GRAPHICS_H
#define GL_GRAPHICS_H

typedef struct BufferO {
  u32 VAO; // Vertex Array Object
  u32 VBO; // Vertex Buffer Object
  u32 EBO; // Element Buffer Object
  u32 TexO; // Texture Buffer Object
  u32 *TexArray; // Tex Object Array
} BufferO;

typedef struct Texture2D {
  i32 width;
  i32 height;
  i32 nrChannels;
  unsigned char* data;
} Texture2D;

void LoadUniformInt(u32 SP, const char *Unifrom, i32 Val);
void LoadUniformFloat(u32 SP, const char *Uniform, f32 Val);
void LoadUniformVec3(u32 SP, const char *Unifrom, Vec3 Val);
void LoadUniformMat4(u32 SP, const char *Uniform, Mat4 Val);
u32 CreateVertexShader(const char *VertexShaderSource);
u32 CreateFragmentShader(const char *FragmentShaderSource);
u32 CreateShaderProgram(unsigned int VertexShader, unsigned int FragmentShader);

u32 CreateTriangle(f32 vertices[], i32 sz);
void DrawTriangle(u32 VAO);

u32 CreateRectangle(f32 vertices[], i32 v_sz, u32 indices[], i32 i_sz);
/**
 * @note: the texture functions for rectangle are more obtuse and less clear
 * they don't make as much sense. And they dont just create something. 
 * They play on to the state machine-ness of opengl, and just enable a set of 
 * operations I find repetitive.
 *
 * @todo: I need to probably add the examples to my utils file as notes
 * */
BufferO CreateRectangleTextured(f32 vertices[], i32 v_sz, u32 indices[], i32 i_sz, u32 attr);
void MakeRectangleTextured(BufferO *bo, f32 vertices[], i32 v_sz, u32 indices[], i32 i_sz, u32 attr);
void DrawRectangle(u32 VAO);
void DrawRectangleTextured(u32 VAO, u32 TexO);

BufferO CreateCube(f32 vertices[], i32 v_sz);
BufferO CreateCubeTextured(f32 vertices[], i32 v_sz);
void DrawCube(u32 VAO);

GLint GetColorAttrib(u32 nrChannels);
void GenAndBindGlTexture(Texture2D Tex, u32 VAO, u32 *TexO);
void BindGlTexture(Texture2D Tex, u32 VAO, u32 TexO);
#endif