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/**
* @file terrain.h
* @author your name (you@domain.com)
* @brief
* @version 0.1
* @date 2024-04-27
*
* @copyright Copyright (c) 2024
*
*/
/*
Future:
- Chunked terrain
- Dynamic LOD
*/
#include "defines.h"
#include "maths_types.h"
#include "mem.h"
#include "str.h"
#include "render_types.h"
typedef struct heightmap {
str8 filepath;
u32x2 size;
void* image_data;
bool is_uploaded;
} heightmap;
typedef struct terrain_state {
arena terrain_allocator;
heightmap* heightmap; // NULL = no heightmap
} terrain_state;
bool terrain_system_init(terrain_state* state);
void terrain_system_shutdown(terrain_state* state);
void terrain_system_render_hmap(renderer* rend, terrain_state* state);
heightmap heightmap_from_image(str8 filepath);
heightmap heightmap_from_perlin(/* TODO: perlin noise generation parameters */);
/** @brief Get the height (the Y component) for a vertex at a particular coordinate in the heightmap
*/
f32 heightmap_height_at_xz(heightmap* hmap, f32 x, f32 z);
/** @brief Calculate the normal vector of a vertex at a particular coordinate in the heightmap */
vec3 heightmap_normal_at_xz(heightmap* hmap, f32 x, f32 z);
/** @brief Generate the `geometry_data` for a heightmap ready to be uploaded to the GPU */
geometry_data geo_heightmap(arena* a, heightmap heightmap);
// somewhere there will be an easy way to add a heightmap
// scene_add_heightmap
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