//===========================================================================
// G_DGL.H
//  The game's interface to DGL. Only includes the functions the game can
//  safely access.  
//===========================================================================
#ifndef __GAME_DGL_DRIVER_H__
#define __GAME_DGL_DRIVER_H__

#include "../dglib.h"

typedef struct gamedgl_s {
	// Viewport.
	void            (*Clear) (int bufferbits);
	void            (*Show) (void);
	void            (*Viewport) (int x, int y, int width, int height);
	void            (*Scissor) (int x, int y, int width, int height);

	// State.
	int             (*GetInteger) (int name);
	int             (*GetIntegerv) (int name, int *v);
	int             (*SetInteger) (int name, int value);
	char           *(*GetString) (int name);
	int             (*Enable) (int cap);
	void            (*Disable) (int cap);
	void            (*Func) (int func, int param1, int param2);

	// Textures.
	                DGLuint(*NewTexture) (void);
	void            (*DeleteTextures) (int num, DGLuint * names);
	int             (*TexImage) (int format, int width, int height, int mipmap,
								 void *data);
	void            (*TexParameter) (int pname, int param);
	void            (*GetTexParameterv) (int level, int pname, int *v);
	void            (*Palette) (int format, void *data);
	int             (*Bind) (DGLuint texture);

	// Matrix operations.
	void            (*MatrixMode) (int mode);
	void            (*PushMatrix) (void);
	void            (*PopMatrix) (void);
	void            (*LoadIdentity) (void);
	void            (*Translatef) (float x, float y, float z);
	void            (*Rotatef) (float angle, float x, float y, float z);
	void            (*Scalef) (float x, float y, float z);
	void            (*Ortho) (float left, float top, float right, float bottom,
							  float znear, float zfar);
	void            (*Perspective) (float fovy, float aspect, float zNear,
									float zFar);

	// Colors.
	void            (*Color3ub) (DGLubyte r, DGLubyte g, DGLubyte b);
	void            (*Color3ubv) (void *data);
	void            (*Color4ub) (DGLubyte r, DGLubyte g, DGLubyte b,
								 DGLubyte a);
	void            (*Color4ubv) (void *data);
	void            (*Color3f) (float r, float g, float b);
	void            (*Color3fv) (float *data);
	void            (*Color4f) (float r, float g, float b, float a);
	void            (*Color4fv) (float *data);

	// Drawing.
	void            (*Begin) (int mode);
	void            (*End) (void);
	void            (*Vertex2f) (float x, float y);
	void            (*Vertex2fv) (float *data);
	void            (*Vertex3f) (float x, float y, float z);
	void            (*Vertex3fv) (float *data);
	void            (*TexCoord2f) (float s, float t);
	void            (*TexCoord2fv) (float *data);
	void            (*Vertices2ftv) (int num, gl_ft2vertex_t * data);
	void            (*Vertices3ftv) (int num, gl_ft3vertex_t * data);
	void            (*Vertices3fctv) (int num, gl_fct3vertex_t * data);

	// Miscellaneous.
	int             (*Grab) (int x, int y, int width, int height, int format,
							 void *buffer);
	void            (*Fog) (int pname, float param);
	void            (*Fogv) (int pname, void *data);
	int             (*Project) (int num, gl_fc3vertex_t * inVertices,
								gl_fc3vertex_t * outVertices);
	int             (*ReadPixels) (int *inData, int format, void *pixels);
} gamedgl_t;

extern gamedgl_t gl;

void            G_InitDGL(void);

#endif