lg_terrain.h

/*
 *      LibGame - Copyright (C) Emmanuel Thomas-Maurin 2011-2025
 *      All rights reserved
 */
 
#ifndef LG_TERRAIN_H
#define LG_TERRAIN_H
 
#define HEIGHTMAP_MAX_W         1024
#define HEIGHTMAP_MAX_H         1024
 
#define HEIGHTMAP_MIN_W         8
#define HEIGHTMAP_MIN_H         8
 
#define TERRAIN_BBOX_COLOR      "cyan"
 
typedef enum {
        RANDOM_NOISE,
        PERLIN_NOISE,
        OPENSIMPLEX2_NOISE,
        CELLULAR_NOISE          /* = VORONOI_NOISE */
        /*
        OPENSIMPLEX2S_NOISE
        VALUE_CUBIC_NOISE
        VALUE_NOISE
        */
} lg_noise_type;
 
#define NORTH_BORDER    1
#define SOUTH_BORDER    2
#define WEST_BORDER     4
#define EAST_BORDER     8
 
/* Horizontally-centered and normalized */
typedef struct {
        Vertex_uv_n     *vbo_data;      /* VBO (with interleaved vertex data) - sizeof(Vertex_uv_n) = 24 */
        uint32_t        *ibo_data;      /* IBO (indices start at 0) - sizeof(uint32_t) = 4 */
        uint32_t        vbo_size;
        uint32_t        ibo_size;
        uint32_t        n_vertices;
        uint32_t        n_faces;
        uint32_t        n_indices;      /* Needed ? Always = n_faces * 3 */
        LG_Texture      *tex;
        uint16_t        elevation[HEIGHTMAP_MAX_W * HEIGHTMAP_MAX_H];   /* heightmap * 65535 * vert_scaling_k */
        uint16_t        grid_w;
        uint16_t        grid_h;
} LG_Terrain;
 
LG_Terrain              *lg_terrain_new(uint16_t, uint16_t, float, int, int, float, LG_Texture *);
 
LG_Terrain              *lg_terrain_new_from_heightmap(float *, uint16_t, uint16_t, float, LG_Texture *);
 
float                   lg_terrain_get_elevation(LG_Terrain *, float, float, uint16_t, uint16_t);
 
void                    lg_terrain_free(LG_Terrain *);
 
float                   *lg_heightmap_generate(uint16_t, uint16_t, int, int, float);
 
void                    lg_heightmaps_add(float *, float *, uint16_t, uint16_t, float);
 
void                    lg_heightmap_flatten_border(float *, uint16_t, uint16_t, uint16_t, int);
 
void                    lg_heightmap_apply_func(float *, uint16_t, uint16_t, float (*)(uint16_t, uint16_t, float));
 
LG_Mesh                 *lg_terrain_to_mesh(LG_Terrain *);
 
Vertex_rgba             *lg_horiz_grid(uint16_t, int *, float, LG_Color_u);
 
// DEPRECATED
const Vertex            *lg_horiz_grid0();
 
const unsigned short    *lg_horiz_grid0_indices();
 
size_t                  lg_sizeof_horiz_grid0();
 
size_t                  lg_sizeof_horiz_grid0_indices();
 
#endif /* LG_TERRAIN_H */