#ifndef ST2_H
#define ST2_H

typedef struct {
  int initialized;
  int rows, cols;
  unsigned char *data;
} fb;

#define NUM_FRAMEBUFFERS 20

extern fb frameBuffer[NUM_FRAMEBUFFERS];

typedef struct {
  unsigned char r,g,b,a;
} Color;

void st2_error(const char *, ...);
void *st2_malloc(int);

void colorSet(Color *, unsigned char, unsigned char, unsigned char);
void colorSetA(Color *, unsigned char, unsigned char, unsigned char, unsigned char);
void colorGray(Color *, Color *);

#define R(c) (c)->r
#define G(c) (c)->g
#define B(c) (c)->b
#define A(c) (c)->a

int fbInit(int, int);
int fbIsInitialized(int);
int fbRows(int);
int fbCols(int);
void fbFree(int);
void fbPutColor(int, int, int, Color*);
void fbGetColor(int, int, int, Color*);
void fbWrite(int, char *);
int fbRead(char *);

typedef void *DSO;

DSO dsoOpen(char *);
void *dsoGetSymbol(DSO, char *);
void dsoClose(DSO);

typedef int st2Enum;

/* Shading Modes */

#define ST2_FLAT 0
#define ST2_GOURAUD 1
#define ST2_PHONG 2
#define ST2_PROCEDURAL 3

/* Matrix Stacks */

#define ST2_PROJECTION 4
#define ST2_MODELVIEW 5
#define ST2_TEXTURE 6

/* Things that can be enabled / disabled */

#define ST2_ZBUFFER 7
#define ST2_LIGHTING 8
/* #define ST2_TEXTURE NOTHING -- reused from the matrix stack definition */
#define ST2_LIGHT0 9
#define ST2_LIGHT1 10
#define ST2_LIGHT2 11
#define ST2_LIGHT3 12
#define ST2_LIGHT4 13
#define ST2_LIGHT5 14
#define ST2_LIGHT6 15
#define ST2_LIGHT7 16
#define ST2_LIGHT8 17
#define ST2_LIGHT9 18
#define ST2_BACKFACE_CULLING 19
#define ST2_ALPHA_BLENDING 20
#define ST2_FOG 21
#define ST2_SHADOWS 22

/* Fog paramaters */

#define ST2_FOG_LINEAR 23
#define ST2_FOG_EXPONENTIAL 24
#define ST2_FOG_EXPONENTIAL2 25

/* Texture mapping mode */

#define ST2_DECAL 26
#define ST2_MODULATE 27

/* Texture repeat mode */

#define ST2_CLAMP 28
#define ST2_REPEAT 29

/* Light paramaters */

#define ST2_LIGHT_AMBIENT 30
#define ST2_LIGHT_DIFFUSE 31
#define ST2_LIGHT_SPECULAR 32
#define ST2_LIGHT_POSITION 33
#define ST2_LIGHT_DIRECTION 34
#define ST2_SPOT_DIRECTION 35
#define ST2_SPOT_EXPONENT 36
#define ST2_SPOT_CUTOFF 37
#define ST2_CONSTANT_ATTENUATION 38
#define ST2_LINEAR_ATTENUATION 39
#define ST2_QUADRATIC_ATTENUATION 40

/* enums for st2GetState */

#define ST2_ENABLED 41
#define ST2_DISABLED 42

#define ST2_CUR_COLOR 43
#define ST2_CUR_CLEAR_COLOR 44
#define ST2_ANTIALIAS_QUALITY 45
#define ST2_SHADE_MODE 46
#define ST2_CUR_FRAMEBUFFER 47

#define ST2_CUR_MATRIX_STACK 48
#define ST2_CUR_TEXTURE_BUFFER 49
#define ST2_CUR_TEXTURE_COORDINATE 50
#define ST2_TEXTURE_MODE 51
#define ST2_TEXTURE_REPEAT_MODE 52

#define ST2_CUR_NORMAL 53
#define ST2_CUR_AMBIENT_COLOR 54
#define ST2_CUR_MATERIAL 55
void st2Initialize(void);
int st2GetState(st2Enum request, void *data);

void st2Color(Color *c);
void st2ClearColor(Color *c);
void st2AntiAliasQuality(int quality);
void st2ShadeMode(st2Enum mode);
void st2FrameBuffer(int fbHandle);

void st2ClearFrameBuffer(void);
void st2Vertex2D(double x, double y);
void st2MatrixStack(st2Enum stack);
void st2Enable(st2Enum code);
void st2Disable(st2Enum code);
void st2TextureImage(int fbHandle);
void st2TextureCoord(float s, float t);
void st2TextureMode(st2Enum mode);
void st2TextureRepeatMode(st2Enum mode);

void st2LoadIdentity(void);
void st2PushMatrix(void);
void st2PopMatrix(void);

void st2Translate(double x, double y, double z);
void st2Rotate(double angle, double x, double y, double z);
void st2Scale(double x, double y, double z);
void st2MultMatrix(double **m);

void st2Vertex3D(double x, double y, double z);

void st2Perspective(double fov, double aspect, double near, double far);
void st2LookAt(double eyex, double eyey, double eyez, double lookatx, double lookaty, double lookatz, double upx, double upy, double upz);
void st2Ortho(double minx, double maxx, double miny, double maxy, double minz, double maxz);

void st2Normal(double x, double y, double z);
void st2AmbientColor(Color *c);
void st2Material(Color *ambient, Color *diffuse, Color *specular, Color *emission, double shininess);

void st2Light(st2Enum light, st2Enum param_name, void *value);

void st2Fog(st2Enum mode, double density, double start, double end, Color *c);

void st2Sphere(double radius, double x, double y, double z, int divisions);

void st2ProceduralShader(char *name);


#endif /* ST2_H */