/*
 *  This file is part of Permafrost Engine. 
 *  Copyright (C) 2017-2023 Eduard Permyakov 
 *
 *  Permafrost Engine is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Permafrost Engine is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *  Linking this software statically or dynamically with other modules is making 
 *  a combined work based on this software. Thus, the terms and conditions of 
 *  the GNU General Public License cover the whole combination. 
 *  
 *  As a special exception, the copyright holders of Permafrost Engine give 
 *  you permission to link Permafrost Engine with independent modules to produce 
 *  an executable, regardless of the license terms of these independent 
 *  modules, and to copy and distribute the resulting executable under 
 *  terms of your choice, provided that you also meet, for each linked 
 *  independent module, the terms and conditions of the license of that 
 *  module. An independent module is a module which is not derived from 
 *  or based on Permafrost Engine. If you modify Permafrost Engine, you may 
 *  extend this exception to your version of Permafrost Engine, but you are not 
 *  obliged to do so. If you do not wish to do so, delete this exception 
 *  statement from your version.
 *
 */

#ifndef GL_RENDER_H
#define GL_RENDER_H

#include "public/render.h"
#include "../map/public/tile.h"
#include "../pf_math.h"

#include <GL/glew.h>

#include <stddef.h>
#include <stdbool.h>


#define SPLAT_MAP_TUNIT  (GL_TEXTURE12)
#define SKYBOX_TUNIT     (GL_TEXTURE13)
#define HEIGHT_MAP_TUNIT (GL_TEXTURE14)
#define SHADOW_MAP_TUNIT (GL_TEXTURE15)

struct render_private;
struct vertex;
struct tile;
struct tile_desc;
struct map;

/* General */

void   R_GL_Init(struct render_private *priv, const char *shader, const struct vertex *vbuff);
void   R_GL_GlobalConfig(void);
void   R_GL_SetViewport(int *x, int *y, int *w, int *h);

/* Shadows */

void   R_GL_InitShadows(void);
vec3_t R_GL_GetLightPos(void);
void   R_GL_SetLightSpaceTrans(const mat4x4_t *trans);
void   R_GL_ShadowMapBind(void);

/* Water */

void   R_GL_SetClipPlane(vec4_t plane_eq);

/* Terrain */

void   R_GL_MapFogBindLast(GLuint tunit, GLuint shader_prog, const char *uname);
void   R_GL_MapUpdateFogClear(void);

/* Skybox */

void   R_GL_SkyboxBind(void);
void   R_GL_DrawSkyboxScaled(const struct camera *cam, float *map_width, float *map_height);


#endif
