kheightmap_terrain.h

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#pragma once
 
#include "defines.h"
#include "math/math_types.h"
 
#define HEIGHTMAP_TERRAIN_MAX_MATERIAL_COUNT
 
typedef struct kheightmap_terrain_vertex {
    vec3 position;
    vec3 normal;
    vec2 texcoord;
    vec4 colour;
    vec4 tangent;
    f32 material_weights[HEIGHTMAP_TERRAIN_MAX_MATERIAL_COUNT];
} kheightmap_terrain_vertex;
 
typedef struct heightmap_terrain_chunk_lod {
    u32 surface_index_count;
    u32 total_index_count;
    u32* indices;
    u64 index_buffer_offset;
} heightmap_terrain_chunk_lod;
 
typedef struct heightmap_terrain_chunk {
    u16 generation;
    u32 surface_vertex_count;
    u32 total_vertex_count;
 
    // The vertex data.
    kheightmap_terrain_vertex* vertices;
    // The offset in bytes into the vertex buffer.
    u64 vertex_buffer_offset;
 
    heightmap_terrain_chunk_lod* lods;
 
    vec3 center;
    extents_3d extents;
 
    // NOTE: While it's possible to have this live at the terrain level, it's
    // more flexible to have it here, as it then theoretically makes the limit
    // of materials to HEIGHTMAP_TERRAIN_MAX_MATERIAL_COUNT per _chunk_ instead of
    // for the _entire heightmap terrain_. While the implementation may not currently
    // support this, keeping this here makes this easier to work toward in the future.
    struct material* material;
    u8 current_lod;
} heightmap_terrain_chunk;