// gLib2D by Geecko - A simple, fast, light-weight 2D graphics library.
//
// This work is licensed under the Creative Commons BY-SA 3.0 Unported License.
// See LICENSE for more details.

#ifndef GLIB2D_H
#define GLIB2D_H

//#define USE_VFPU TODO

#define G_SCR_W (480)
#define G_SCR_H (272)
#define G_FALSE 0
#define G_TRUE !0

#define G_RGBA(r,g,b,a) \
  ((r)|((g)<<8)|((b)<<16)|((a)<<24))

#define G_GET_R(color) (((color)    ) & 0xFF)
#define G_GET_G(color) (((color)>>8 ) & 0xFF)
#define G_GET_B(color) (((color)>>16) & 0xFF)
#define G_GET_A(color) (((color)>>24) & 0xFF)

#define G_MODULATE(color,luminance,alpha) \
  G_RGBA(luminance*G_GET_R(color)/255, \
         luminance*G_GET_G(color)/255, \
         luminance*G_GET_B(color)/255, \
         alpha    *G_GET_A(color)/255)

enum gColors
{
  // Primary colors
  RED          = 0xFF0000FF,
  GREEN        = 0xFF00FF00,
  BLUE         = 0xFFFF0000,
  // Secondary colors
  CYAN         = 0xFFFFFF00,
  MAGENTA      = 0xFFFF00FF,
  YELLOW       = 0xFF00FFFF,
  // Tertiary colors
  AZURE        = 0xFFFF7F00,
  VIOLET       = 0xFFFF007F,
  ROSE         = 0xFF7F00FF,
  ORANGE       = 0xFF007FFF,
  CHARTREUSE   = 0xFF00FF7F,
  SPRING_GREEN = 0xFF7FFF00,
  // Grayscale
  WHITE        = 0xFFFFFFFF,
  LITEGRAY     = 0xFFBFBFBF,
  GRAY         = 0xFF7F7F7F,
  DARKGRAY     = 0xFF3F3F3F,
  BLACK        = 0xFF000000
};

// First gEnum is the default.
enum Coord_Modes { G_UP_LEFT, G_UP_RIGHT, G_DOWN_RIGHT, G_DOWN_LEFT, G_CENTER };
enum Rotation_Modes { G_EACH_OBJ, G_POINT };

typedef char bool;
typedef unsigned char gAlpha;
typedef unsigned int gColor;
typedef int gEnum;

typedef struct
{
  int texW, texH;
  int imgW, imgH;
  float ratio;
  bool swizzled;
  gColor* data;
} gImage;

void gClear(gColor color, bool zclear); // Clears screen & depth buffer
void gBegin(); // Begin Object
void gEnd(); // End & draw Object
void gReset(); // Call all gReset* functions (for gSetRelative* stuff)
void gFlip(bool vsync); // Flip the screen

// All gSet* functions must be called between gBegin() & gEnd()
// All gSetRelative* functions are relative to the others gSet* functions parameters

void gResetCoord(); // Set to G_UP_LEFT and (0.f;0.f;0.f)
void gSetCoordMode(gEnum mode); // TODO Choose between Coord_Modes
void gSetCoordXY(float x, float y); // New object (or vertex)
void gSetCoordXYZ(float x, float y, float z); // New object (or vertex) with zbuffer
void gSetCoordXYRelative(float x, float y);
void gSetCoordXYZRelative(float x, float y, float z);

// TODO
void gResetCrop();
void gSetCropXY(int x, int y); // Image part to blit, position
void gSetCropWH(int w, int h); // Image part to blit, size
void gSetCropXYRelative(int x, int y);
void gSetCropWHRelative(int w, int h);

void gResetScale(); // Set scale to 1.f,1.f
void gSetScale(float w, float h); // Set scale from 0.f to 1.f, value can be negative to invert
void gSetScaleWH(int w, int h); // Set new width & height, an alternative to gSetScale
void gSetScaleRelative(float w, float h);
void gSetScaleWHRelative(int w, int h);

void gResetColor(); // Set color to WHITE
void gResetAlpha(); // Set alpha to 255
void gSetColor(gColor color); // Set color of the object, used to colorize it
void gSetAlpha(gAlpha alpha); // Set alpha of the object, proportionnal with the color alpha.
void gSetAlphaRelative(gAlpha alpha);

// TODO
void gResetRotation(); // Set rotation to 0° & G_EACH_OBJ
void gSetRotationMode(gEnum mode); // Choose between Rotation_Modes
void gSetRotationXY(float x, float y); // Set the center of the rotation, absolute with G_POINT, or relative with XY with G_EACH_OBJ
void gSetRotationAngle(float degrees); // Sets the rotation angle, in degrees.
void gSetRotationAngleRad(float radians); // Sets the rotation angle, in radians.
void gSetRotationXYRelative(float x, float y);
void gSetRotationAngleRelative(float degrees);
void gSetRotationAngleRadRelative(float radians);

// TODO
gImage* gTexLoad(const char path[], bool swizzle); // Load an image file, can be swizzled (fastest)
void gSetTex(gImage* img, bool blend); // Apply a texture to an object, blend can be enabled

#endif