#pragma once
#include <SDL.h>
#include <SDL_opengl.h>
#include "physics.h"

// Recommended for compatibility bullshit.
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
#  define RMASK 0xff000000
#  define GMASK 0x00ff0000
#  define BMASK 0x0000ff00
#  define AMASK 0x000000ff
#else
#  define RMASK 0x000000ff
#  define GMASK 0x0000ff00
#  define BMASK 0x00ff0000
#  define AMASK 0xff000000
#endif
#define RGBMASK RMASK,GMASK,BMASK,AMASK

// Info about opengl screen.
typedef struct {
  int w, h;         // Window dimensions.
  int depth;        // Depth in bpp.
  int fullscreen;   // 1 = fullscreen, 0 = windowed.
  int r, g, b, a;   // Framebuffer values in bits.
  int doublebuf;    // Double buffer.
} gl_info;
extern gl_info gl_screen; // Local structure set with gl_init etc.

// Colors.
typedef struct {
  double r, g, b, a;
} glColor;
#define COLOR(x) glColor4d((x).r, (x).g, (x).b, (x).a)

// Default colors.
extern glColor cGrey;

// Spritesheet info.
typedef struct {
  double w, h;        // Real size of the image (excluding POT buffer.
  double rw, rh;      // Size of POT surface.
  double sx, sy;      // Number of sprites on x and y axes.
  double sw, sh;      // Size of each sprite.
  GLuint texture;     // The opengl texture itself.
  uint8_t* trans;     // Maps the transparency.
} gl_texture;

// Font info.
typedef struct {
  int h; // Height.
  int* w;
  GLuint* textures;
  GLuint list_base;
} gl_font;
extern gl_font gl_defFont; // Default font.

// gl_font loading/freeing.
// If font is NULL it uses the internal default font, same with gl_print
void gl_fontInit(gl_font* font, const char* fname, const unsigned int h);
void gl_freeFont(gl_font* font);

// gl_texute loading/freeing.
gl_texture* gl_loadImage(SDL_Surface* surface); // Frees the surface.
gl_texture* gl_newImage(const char* path);
gl_texture* gl_newSprite(const char* path, const int sx, const int sy);
void gl_freeTexture(gl_texture* texture);

// Rendering.
void gl_blitSprite(const gl_texture* sprite, const Vec2* pos, 
      const int sx, const int sy, const glColor* c);

void gl_blitStatic(const gl_texture* texture, const Vec2* pos, const glColor* c);
void gl_bindCamera(const Vec2* pos);
void gl_print(const gl_font* ft_font, const Vec2* pos, const glColor* c, const char* fmt, ...);
int  gl_printWidth(const gl_font* ft_font, const char* fmt, ...);

// Initialize/cleanup.
int gl_init(void);
void gl_exit(void);

// Misc.
int gl_isTrans(const gl_texture* t, const int x, const int y);
void gl_getSpriteFromDir(int* x, int* y, const gl_texture* t, const double dir);