geometry.h

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#pragma once
 
#include "math/math_types.h"
#include "strings/kname.h"
#include "utils/kcolour.h"
 
#define GEOMETRY_NAME_MAX_LENGTH 256
 
typedef enum kgeometry_type {
    KGEOMETRY_TYPE_UNKNOWN = 0x00,
    KGEOMETRY_TYPE_2D_STATIC = 0x01,
    KGEOMETRY_TYPE_2D_DYNAMIC = 0x02,
    KGEOMETRY_TYPE_3D_STATIC = 0x03,
    KGEOMETRY_TYPE_3D_STATIC_COLOUR = 0x04,
    KGEOMETRY_TYPE_3D_STATIC_POSITION_ONLY = 0x05,
    KGEOMETRY_TYPE_3D_DYNAMIC = 0x06,
    KGEOMETRY_TYPE_3D_SKINNED = 0x07,
    KGEOMETRY_TYPE_3D_HEIGHTMAP_TERRAIN = 0x08,
    KGEOMETRY_TYPE_CUSTOM = 0xFF,
} kgeometry_type;
 
typedef struct kgeometry {
    kname name;
 
    kgeometry_type type;
    u16 generation;
    vec3 center;
    extents_3d extents;
 
    u32 vertex_count;
    u32 vertex_element_size;
    void* vertices;
    u64 vertex_buffer_offset;
 
    u32 index_count;
    u32 index_element_size;
    void* indices;
    u64 index_buffer_offset;
} kgeometry;
 
typedef enum grid_orientation {
    GRID_ORIENTATION_XZ = 0,
    GRID_ORIENTATION_XY = 1,
    GRID_ORIENTATION_YZ = 2
} grid_orientation;
 
KAPI void geometry_generate_normals(u32 vertex_count, vertex_3d* vertices, u32 index_count, u32* indices);
 
KAPI void geometry_generate_tangents(u32 vertex_count, vertex_3d* vertices, u32 index_count, u32* indices);
 
KAPI void geometry_deduplicate_vertices(u32 vertex_count, vertex_3d* vertices, u32 index_count, u32* indices, u32* out_vertex_count, vertex_3d** out_vertices);
 
KAPI void generate_uvs_from_image_coords(u32 img_width, u32 img_height, u32 px_x, u32 px_y, f32* out_tx, f32* out_ty);
 
KAPI kgeometry geometry_generate_quad(f32 width, f32 height, f32 tx_min, f32 tx_max, f32 ty_min, f32 ty_max, kname name);
 
KAPI kgeometry geometry_generate_line2d(vec2 point_0, vec2 point_1, kname name);
 
KAPI kgeometry geometry_generate_line3d(vec3 point_0, vec3 point_1, kname name);
KAPI kgeometry geometry_generate_line3d_typed(vec3 point_0, vec3 point_1, kname name, kgeometry_type type);
 
KAPI kgeometry geometry_generate_line_sphere3d(f32 radius, u32 segment_count, kname name);
KAPI kgeometry geometry_generate_line_sphere3d_typed(f32 radius, u32 segment_count, kname name, kgeometry_type type);
 
KAPI kgeometry geometry_generate_plane(f32 width, f32 height, u32 x_segment_count, u32 y_segment_count, f32 tile_x, f32 tile_y, kname name);
 
KAPI kgeometry geometry_generate_plane_2d(f32 width, f32 height, u32 x_segment_count, u32 y_segment_count, f32 tile_x, f32 tile_y, kname name, b8 centered);
 
KAPI void geometry_recalculate_line_box3d_by_points(kgeometry* geometry, vec3 points[8]);
 
KAPI void geometry_recalculate_line_box3d_by_extents(kgeometry* geometry, extents_3d extents, vec3 offset);
 
KAPI kgeometry geometry_generate_line_box3d(vec3 size, kname name, vec3 offset);
KAPI kgeometry geometry_generate_line_box3d_typed(vec3 size, kname name, kgeometry_type type, vec3 offset);
 
KAPI kgeometry geometry_generate_cube(f32 width, f32 height, f32 depth, f32 tile_x, f32 tile_y, kname name);
 
KAPI kgeometry geometry_generate_grid(grid_orientation orientation, u32 segment_count_dim_0, u32 segment_count_dim_1, f32 segment_size, b8 use_third_axis, kname name);
 
KAPI void geometry_destroy(kgeometry* geometry);
 
KAPI void generate_axis_geometry(
    axis_3d axis,
    f32 base_offset,
    f32 length,
    colour4 colour,
    f32 shaft_radius,
    f32 arrowhead_radius,
    f32 arrowhead_length,
    u32 segment_count,
    b8 include_arrowhead,
    u32* out_vertex_count,
    u32* out_index_count,
    colour_vertex_3d* vertices,
    u32* indices,
    u32 vertex_offset);
 
KAPI void generate_axis_ring_geometry(
    axis_3d axis,
    f32 radius,
    f32 thickness,
    colour4 colour,
    u32 ring_segments,
    u32 tube_segments,
    u32* out_vertex_count,
    u32* out_index_count,
    colour_vertex_3d* vertices,
    u32* indices,
    u32 vertex_offset);